drivers/s390/cio/qdio_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   4  *
   5  * Copyright IBM Corp. 2000, 2008
   6  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   7  *            Jan Glauber <jang@linux.vnet.ibm.com>
   8  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/timer.h>
  14 #include <linux/delay.h>
  15 #include <linux/gfp.h>
  16 #include <linux/io.h>
  17 #include <linux/atomic.h>
  18 #include <asm/debug.h>
  19 #include <asm/qdio.h>
  20 #include <asm/ipl.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  * @aob: asynchronous operation block
  76  *
  77  * Returns condition code.
  78  * Note: For IQDC unicast queues only the highest priority queue is processed.
  79  */
  80 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  81                                  unsigned int *bb, unsigned int fc,
  82                                  unsigned long aob)
  83 {
  84         register unsigned long __fc asm("0") = fc;
  85         register unsigned long __schid asm("1") = schid;
  86         register unsigned long __mask asm("2") = mask;
  87         register unsigned long __aob asm("3") = aob;
  88         int cc;
  89
  90         asm volatile(
  91                 "       siga    0\n"
  92                 "       ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  95                 : "d" (__schid), "d" (__mask)
  96                 : "cc");
  97         *bb = __fc >> 31;
  98         return cc;
  99 }
 100
 101 /**
 102  * qdio_do_eqbs - extract buffer states for QEBSM
 103  * @q: queue to manipulate
 104  * @state: state of the extracted buffers
 105  * @start: buffer number to start at
 106  * @count: count of buffers to examine
 107  * @auto_ack: automatically acknowledge buffers
 108  *
 109  * Returns the number of successfully extracted equal buffer states.
 110  * Stops processing if a state is different from the last buffers state.
 111  */
 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 113                         int start, int count, int auto_ack)
 114 {
 115         int tmp_count = count, tmp_start = start, nr = q->nr;
 116         unsigned int ccq = 0;
 117
 118         qperf_inc(q, eqbs);
 119
 120         if (!q->is_input_q)
 121                 nr += q->irq_ptr->nr_input_qs;
 122 again:
 123         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 124                       auto_ack);
 125
 126         switch (ccq) {
 127         case 0:
 128         case 32:
 129                 /* all done, or next buffer state different */
 130                 return count - tmp_count;
 131         case 96:
 132                 /* not all buffers processed */
 133                 qperf_inc(q, eqbs_partial);
 134                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
 135                         tmp_count);
 136                 return count - tmp_count;
 137         case 97:
 138                 /* no buffer processed */
 139                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 140                 goto again;
 141         default:
 142                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 143                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 144                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 145                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
 146                            q->first_to_kick, count, q->irq_ptr->int_parm);
 147                 return 0;
 148         }
 149 }
 150
 151 /**
 152  * qdio_do_sqbs - set buffer states for QEBSM
 153  * @q: queue to manipulate
 154  * @state: new state of the buffers
 155  * @start: first buffer number to change
 156  * @count: how many buffers to change
 157  *
 158  * Returns the number of successfully changed buffers.
 159  * Does retrying until the specified count of buffer states is set or an
 160  * error occurs.
 161  */
 162 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 163                         int count)
 164 {
 165         unsigned int ccq = 0;
 166         int tmp_count = count, tmp_start = start;
 167         int nr = q->nr;
 168
 169         if (!count)
 170                 return 0;
 171         qperf_inc(q, sqbs);
 172
 173         if (!q->is_input_q)
 174                 nr += q->irq_ptr->nr_input_qs;
 175 again:
 176         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 177
 178         switch (ccq) {
 179         case 0:
 180         case 32:
 181                 /* all done, or active buffer adapter-owned */
 182                 WARN_ON_ONCE(tmp_count);
 183                 return count - tmp_count;
 184         case 96:
 185                 /* not all buffers processed */
 186                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 187                 qperf_inc(q, sqbs_partial);
 188                 goto again;
 189         default:
 190                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 191                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 192                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 193                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
 194                            q->first_to_kick, count, q->irq_ptr->int_parm);
 195                 return 0;
 196         }
 197 }
 198
 199 /*
 200  * Returns number of examined buffers and their common state in *state.
 201  * Requested number of buffers-to-examine must be > 0.
 202  */
 203 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 204                                  unsigned char *state, unsigned int count,
 205                                  int auto_ack, int merge_pending)
 206 {
 207         unsigned char __state = 0;
 208         int i;
 209
 210         if (is_qebsm(q))
 211                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 212
 213         /* get initial state: */
 214         __state = q->slsb.val[bufnr];
 215         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 216                 __state = SLSB_P_OUTPUT_EMPTY;
 217
 218         for (i = 1; i < count; i++) {
 219                 bufnr = next_buf(bufnr);
 220
 221                 /* merge PENDING into EMPTY: */
 222                 if (merge_pending &&
 223                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 224                     __state == SLSB_P_OUTPUT_EMPTY)
 225                         continue;
 226
 227                 /* stop if next state differs from initial state: */
 228                 if (q->slsb.val[bufnr] != __state)
 229                         break;
 230         }
 231         *state = __state;
 232         return i;
 233 }
 234
 235 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 236                                 unsigned char *state, int auto_ack)
 237 {
 238         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 239 }
 240
 241 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 242 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 243                                  unsigned char state, int count)
 244 {
 245         int i;
 246
 247         if (is_qebsm(q))
 248                 return qdio_do_sqbs(q, state, bufnr, count);
 249
 250         for (i = 0; i < count; i++) {
 251                 xchg(&q->slsb.val[bufnr], state);
 252                 bufnr = next_buf(bufnr);
 253         }
 254         return count;
 255 }
 256
 257 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 258                                 unsigned char state)
 259 {
 260         return set_buf_states(q, bufnr, state, 1);
 261 }
 262
 263 /* set slsb states to initial state */
 264 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 265 {
 266         struct qdio_q *q;
 267         int i;
 268
 269         for_each_input_queue(irq_ptr, q, i)
 270                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 271                                QDIO_MAX_BUFFERS_PER_Q);
 272         for_each_output_queue(irq_ptr, q, i)
 273                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 274                                QDIO_MAX_BUFFERS_PER_Q);
 275 }
 276
 277 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 278                           unsigned int input)
 279 {
 280         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 281         unsigned int fc = QDIO_SIGA_SYNC;
 282         int cc;
 283
 284         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 285         qperf_inc(q, siga_sync);
 286
 287         if (is_qebsm(q)) {
 288                 schid = q->irq_ptr->sch_token;
 289                 fc |= QDIO_SIGA_QEBSM_FLAG;
 290         }
 291
 292         cc = do_siga_sync(schid, output, input, fc);
 293         if (unlikely(cc))
 294                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 295         return (cc) ? -EIO : 0;
 296 }
 297
 298 static inline int qdio_siga_sync_q(struct qdio_q *q)
 299 {
 300         if (q->is_input_q)
 301                 return qdio_siga_sync(q, 0, q->mask);
 302         else
 303                 return qdio_siga_sync(q, q->mask, 0);
 304 }
 305
 306 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 307         unsigned long aob)
 308 {
 309         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 310         unsigned int fc = QDIO_SIGA_WRITE;
 311         u64 start_time = 0;
 312         int retries = 0, cc;
 313         unsigned long laob = 0;
 314
 315         WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
 316                              !q->u.out.use_cq));
 317         if (q->u.out.use_cq && aob != 0) {
 318                 fc = QDIO_SIGA_WRITEQ;
 319                 laob = aob;
 320         }
 321
 322         if (is_qebsm(q)) {
 323                 schid = q->irq_ptr->sch_token;
 324                 fc |= QDIO_SIGA_QEBSM_FLAG;
 325         }
 326 again:
 327         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 328
 329         /* hipersocket busy condition */
 330         if (unlikely(*busy_bit)) {
 331                 retries++;
 332
 333                 if (!start_time) {
 334                         start_time = get_tod_clock_fast();
 335                         goto again;
 336                 }
 337                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 338                         goto again;
 339         }
 340         if (retries) {
 341                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 342                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 343                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 351         unsigned int fc = QDIO_SIGA_READ;
 352         int cc;
 353
 354         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 355         qperf_inc(q, siga_read);
 356
 357         if (is_qebsm(q)) {
 358                 schid = q->irq_ptr->sch_token;
 359                 fc |= QDIO_SIGA_QEBSM_FLAG;
 360         }
 361
 362         cc = do_siga_input(schid, q->mask, fc);
 363         if (unlikely(cc))
 364                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 365         return (cc) ? -EIO : 0;
 366 }
 367
 368 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 369 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 370
 371 static inline void qdio_sync_queues(struct qdio_q *q)
 372 {
 373         /* PCI capable outbound queues will also be scanned so sync them too */
 374         if (pci_out_supported(q))
 375                 qdio_siga_sync_all(q);
 376         else
 377                 qdio_siga_sync_q(q);
 378 }
 379
 380 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 381                         unsigned char *state)
 382 {
 383         if (need_siga_sync(q))
 384                 qdio_siga_sync_q(q);
 385         return get_buf_states(q, bufnr, state, 1, 0, 0);
 386 }
 387
 388 static inline void qdio_stop_polling(struct qdio_q *q)
 389 {
 390         if (!q->u.in.polling)
 391                 return;
 392
 393         q->u.in.polling = 0;
 394         qperf_inc(q, stop_polling);
 395
 396         /* show the card that we are not polling anymore */
 397         if (is_qebsm(q)) {
 398                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 399                                q->u.in.ack_count);
 400                 q->u.in.ack_count = 0;
 401         } else
 402                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 403 }
 404
 405 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 406 {
 407         int pos;
 408
 409         q->q_stats.nr_sbal_total += count;
 410         if (count == QDIO_MAX_BUFFERS_MASK) {
 411                 q->q_stats.nr_sbals[7]++;
 412                 return;
 413         }
 414         pos = ilog2(count);
 415         q->q_stats.nr_sbals[pos]++;
 416 }
 417
 418 static void process_buffer_error(struct qdio_q *q, int count)
 419 {
 420         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 421                                         SLSB_P_OUTPUT_NOT_INIT;
 422
 423         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 424
 425         /* special handling for no target buffer empty */
 426         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 427             q->sbal[q->first_to_check]->element[15].sflags == 0x10) {
 428                 qperf_inc(q, target_full);
 429                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 430                               q->first_to_check);
 431                 goto set;
 432         }
 433
 434         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 435         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 436         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 437         DBF_ERROR("F14:%2x F15:%2x",
 438                   q->sbal[q->first_to_check]->element[14].sflags,
 439                   q->sbal[q->first_to_check]->element[15].sflags);
 440
 441 set:
 442         /*
 443          * Interrupts may be avoided as long as the error is present
 444          * so change the buffer state immediately to avoid starvation.
 445          */
 446         set_buf_states(q, q->first_to_check, state, count);
 447 }
 448
 449 static inline void inbound_primed(struct qdio_q *q, int count)
 450 {
 451         int new;
 452
 453         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
 454
 455         /* for QEBSM the ACK was already set by EQBS */
 456         if (is_qebsm(q)) {
 457                 if (!q->u.in.polling) {
 458                         q->u.in.polling = 1;
 459                         q->u.in.ack_count = count;
 460                         q->u.in.ack_start = q->first_to_check;
 461                         return;
 462                 }
 463
 464                 /* delete the previous ACK's */
 465                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 466                                q->u.in.ack_count);
 467                 q->u.in.ack_count = count;
 468                 q->u.in.ack_start = q->first_to_check;
 469                 return;
 470         }
 471
 472         /*
 473          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 474          * or by the next inbound run.
 475          */
 476         new = add_buf(q->first_to_check, count - 1);
 477         if (q->u.in.polling) {
 478                 /* reset the previous ACK but first set the new one */
 479                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 480                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 481         } else {
 482                 q->u.in.polling = 1;
 483                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 484         }
 485
 486         q->u.in.ack_start = new;
 487         count--;
 488         if (!count)
 489                 return;
 490         /* need to change ALL buffers to get more interrupts */
 491         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 492 }
 493
 494 static int get_inbound_buffer_frontier(struct qdio_q *q)
 495 {
 496         unsigned char state = 0;
 497         int count;
 498
 499         q->timestamp = get_tod_clock_fast();
 500
 501         /*
 502          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 503          * would return 0.
 504          */
 505         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 506         if (!count)
 507                 goto out;
 508
 509         /*
 510          * No siga sync here, as a PCI or we after a thin interrupt
 511          * already sync'ed the queues.
 512          */
 513         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 514         if (!count)
 515                 goto out;
 516
 517         switch (state) {
 518         case SLSB_P_INPUT_PRIMED:
 519                 inbound_primed(q, count);
 520                 q->first_to_check = add_buf(q->first_to_check, count);
 521                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 522                         qperf_inc(q, inbound_queue_full);
 523                 if (q->irq_ptr->perf_stat_enabled)
 524                         account_sbals(q, count);
 525                 break;
 526         case SLSB_P_INPUT_ERROR:
 527                 process_buffer_error(q, count);
 528                 q->first_to_check = add_buf(q->first_to_check, count);
 529                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 530                         qperf_inc(q, inbound_queue_full);
 531                 if (q->irq_ptr->perf_stat_enabled)
 532                         account_sbals_error(q, count);
 533                 break;
 534         case SLSB_CU_INPUT_EMPTY:
 535         case SLSB_P_INPUT_NOT_INIT:
 536         case SLSB_P_INPUT_ACK:
 537                 if (q->irq_ptr->perf_stat_enabled)
 538                         q->q_stats.nr_sbal_nop++;
 539                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 540                         q->nr, q->first_to_check);
 541                 break;
 542         default:
 543                 WARN_ON_ONCE(1);
 544         }
 545 out:
 546         return q->first_to_check;
 547 }
 548
 549 static int qdio_inbound_q_moved(struct qdio_q *q)
 550 {
 551         int bufnr;
 552
 553         bufnr = get_inbound_buffer_frontier(q);
 554
 555         if (bufnr != q->last_move) {
 556                 q->last_move = bufnr;
 557                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 558                         q->u.in.timestamp = get_tod_clock();
 559                 return 1;
 560         } else
 561                 return 0;
 562 }
 563
 564 static inline int qdio_inbound_q_done(struct qdio_q *q)
 565 {
 566         unsigned char state = 0;
 567
 568         if (!atomic_read(&q->nr_buf_used))
 569                 return 1;
 570
 571         if (need_siga_sync(q))
 572                 qdio_siga_sync_q(q);
 573         get_buf_state(q, q->first_to_check, &state, 0);
 574
 575         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 576                 /* more work coming */
 577                 return 0;
 578
 579         if (is_thinint_irq(q->irq_ptr))
 580                 return 1;
 581
 582         /* don't poll under z/VM */
 583         if (MACHINE_IS_VM)
 584                 return 1;
 585
 586         /*
 587          * At this point we know, that inbound first_to_check
 588          * has (probably) not moved (see qdio_inbound_processing).
 589          */
 590         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 591                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 592                               q->first_to_check);
 593                 return 1;
 594         } else
 595                 return 0;
 596 }
 597
 598 static inline int contains_aobs(struct qdio_q *q)
 599 {
 600         return !q->is_input_q && q->u.out.use_cq;
 601 }
 602
 603 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 604 {
 605         unsigned char state = 0;
 606         int j, b = start;
 607
 608         if (!contains_aobs(q))
 609                 return;
 610
 611         for (j = 0; j < count; ++j) {
 612                 get_buf_state(q, b, &state, 0);
 613                 if (state == SLSB_P_OUTPUT_PENDING) {
 614                         struct qaob *aob = q->u.out.aobs[b];
 615                         if (aob == NULL)
 616                                 continue;
 617
 618                         q->u.out.sbal_state[b].flags |=
 619                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 620                         q->u.out.aobs[b] = NULL;
 621                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 622                         q->u.out.sbal_state[b].aob = NULL;
 623                 }
 624                 b = next_buf(b);
 625         }
 626 }
 627
 628 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 629                                         int bufnr)
 630 {
 631         unsigned long phys_aob = 0;
 632
 633         if (!q->use_cq)
 634                 return 0;
 635
 636         if (!q->aobs[bufnr]) {
 637                 struct qaob *aob = qdio_allocate_aob();
 638                 q->aobs[bufnr] = aob;
 639         }
 640         if (q->aobs[bufnr]) {
 641                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 642                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 643                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 644                 WARN_ON_ONCE(phys_aob & 0xFF);
 645         }
 646
 647         q->sbal_state[bufnr].flags = 0;
 648         return phys_aob;
 649 }
 650
 651 static void qdio_kick_handler(struct qdio_q *q)
 652 {
 653         int start = q->first_to_kick;
 654         int end = q->first_to_check;
 655         int count;
 656
 657         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 658                 return;
 659
 660         count = sub_buf(end, start);
 661
 662         if (q->is_input_q) {
 663                 qperf_inc(q, inbound_handler);
 664                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 665         } else {
 666                 qperf_inc(q, outbound_handler);
 667                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 668                               start, count);
 669         }
 670
 671         qdio_handle_aobs(q, start, count);
 672
 673         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 674                    q->irq_ptr->int_parm);
 675
 676         /* for the next time */
 677         q->first_to_kick = end;
 678         q->qdio_error = 0;
 679 }
 680
 681 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 682 {
 683         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 684                 tasklet_schedule(&q->tasklet);
 685                 return 0;
 686         }
 687         return -EPERM;
 688 }
 689
 690 static void __qdio_inbound_processing(struct qdio_q *q)
 691 {
 692         qperf_inc(q, tasklet_inbound);
 693
 694         if (!qdio_inbound_q_moved(q))
 695                 return;
 696
 697         qdio_kick_handler(q);
 698
 699         if (!qdio_inbound_q_done(q)) {
 700                 /* means poll time is not yet over */
 701                 qperf_inc(q, tasklet_inbound_resched);
 702                 if (!qdio_tasklet_schedule(q))
 703                         return;
 704         }
 705
 706         qdio_stop_polling(q);
 707         /*
 708          * We need to check again to not lose initiative after
 709          * resetting the ACK state.
 710          */
 711         if (!qdio_inbound_q_done(q)) {
 712                 qperf_inc(q, tasklet_inbound_resched2);
 713                 qdio_tasklet_schedule(q);
 714         }
 715 }
 716
 717 void qdio_inbound_processing(unsigned long data)
 718 {
 719         struct qdio_q *q = (struct qdio_q *)data;
 720         __qdio_inbound_processing(q);
 721 }
 722
 723 static int get_outbound_buffer_frontier(struct qdio_q *q)
 724 {
 725         unsigned char state = 0;
 726         int count;
 727
 728         q->timestamp = get_tod_clock_fast();
 729
 730         if (need_siga_sync(q))
 731                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 732                     !pci_out_supported(q)) ||
 733                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 734                     multicast_outbound(q)))
 735                         qdio_siga_sync_q(q);
 736
 737         /*
 738          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 739          * would return 0.
 740          */
 741         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 742         if (!count)
 743                 goto out;
 744
 745         count = get_buf_states(q, q->first_to_check, &state, count, 0,
 746                                q->u.out.use_cq);
 747         if (!count)
 748                 goto out;
 749
 750         switch (state) {
 751         case SLSB_P_OUTPUT_EMPTY:
 752                 /* the adapter got it */
 753                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 754                         "out empty:%1d %02x", q->nr, count);
 755
 756                 atomic_sub(count, &q->nr_buf_used);
 757                 q->first_to_check = add_buf(q->first_to_check, count);
 758                 if (q->irq_ptr->perf_stat_enabled)
 759                         account_sbals(q, count);
 760
 761                 break;
 762         case SLSB_P_OUTPUT_ERROR:
 763                 process_buffer_error(q, count);
 764                 q->first_to_check = add_buf(q->first_to_check, count);
 765                 atomic_sub(count, &q->nr_buf_used);
 766                 if (q->irq_ptr->perf_stat_enabled)
 767                         account_sbals_error(q, count);
 768                 break;
 769         case SLSB_CU_OUTPUT_PRIMED:
 770                 /* the adapter has not fetched the output yet */
 771                 if (q->irq_ptr->perf_stat_enabled)
 772                         q->q_stats.nr_sbal_nop++;
 773                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 774                               q->nr);
 775                 break;
 776         case SLSB_P_OUTPUT_NOT_INIT:
 777         case SLSB_P_OUTPUT_HALTED:
 778                 break;
 779         default:
 780                 WARN_ON_ONCE(1);
 781         }
 782
 783 out:
 784         return q->first_to_check;
 785 }
 786
 787 /* all buffers processed? */
 788 static inline int qdio_outbound_q_done(struct qdio_q *q)
 789 {
 790         return atomic_read(&q->nr_buf_used) == 0;
 791 }
 792
 793 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 794 {
 795         int bufnr;
 796
 797         bufnr = get_outbound_buffer_frontier(q);
 798
 799         if (bufnr != q->last_move) {
 800                 q->last_move = bufnr;
 801                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 802                 return 1;
 803         } else
 804                 return 0;
 805 }
 806
 807 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 808 {
 809         int retries = 0, cc;
 810         unsigned int busy_bit;
 811
 812         if (!need_siga_out(q))
 813                 return 0;
 814
 815         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 816 retry:
 817         qperf_inc(q, siga_write);
 818
 819         cc = qdio_siga_output(q, &busy_bit, aob);
 820         switch (cc) {
 821         case 0:
 822                 break;
 823         case 2:
 824                 if (busy_bit) {
 825                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 826                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 827                                 goto retry;
 828                         }
 829                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 830                         cc = -EBUSY;
 831                 } else {
 832                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 833                         cc = -ENOBUFS;
 834                 }
 835                 break;
 836         case 1:
 837         case 3:
 838                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 839                 cc = -EIO;
 840                 break;
 841         }
 842         if (retries) {
 843                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 844                 DBF_ERROR("count:%u", retries);
 845         }
 846         return cc;
 847 }
 848
 849 static void __qdio_outbound_processing(struct qdio_q *q)
 850 {
 851         qperf_inc(q, tasklet_outbound);
 852         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 853
 854         if (qdio_outbound_q_moved(q))
 855                 qdio_kick_handler(q);
 856
 857         if (queue_type(q) == QDIO_ZFCP_QFMT)
 858                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 859                         goto sched;
 860
 861         if (q->u.out.pci_out_enabled)
 862                 return;
 863
 864         /*
 865          * Now we know that queue type is either qeth without pci enabled
 866          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 867          * is noticed and outbound_handler is called after some time.
 868          */
 869         if (qdio_outbound_q_done(q))
 870                 del_timer_sync(&q->u.out.timer);
 871         else
 872                 if (!timer_pending(&q->u.out.timer) &&
 873                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 874                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 875         return;
 876
 877 sched:
 878         qdio_tasklet_schedule(q);
 879 }
 880
 881 /* outbound tasklet */
 882 void qdio_outbound_processing(unsigned long data)
 883 {
 884         struct qdio_q *q = (struct qdio_q *)data;
 885         __qdio_outbound_processing(q);
 886 }
 887
 888 void qdio_outbound_timer(struct timer_list *t)
 889 {
 890         struct qdio_q *q = from_timer(q, t, u.out.timer);
 891
 892         qdio_tasklet_schedule(q);
 893 }
 894
 895 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 896 {
 897         struct qdio_q *out;
 898         int i;
 899
 900         if (!pci_out_supported(q))
 901                 return;
 902
 903         for_each_output_queue(q->irq_ptr, out, i)
 904                 if (!qdio_outbound_q_done(out))
 905                         qdio_tasklet_schedule(out);
 906 }
 907
 908 static void __tiqdio_inbound_processing(struct qdio_q *q)
 909 {
 910         qperf_inc(q, tasklet_inbound);
 911         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 912                 qdio_sync_queues(q);
 913
 914         /*
 915          * The interrupt could be caused by a PCI request. Check the
 916          * PCI capable outbound queues.
 917          */
 918         qdio_check_outbound_after_thinint(q);
 919
 920         if (!qdio_inbound_q_moved(q))
 921                 return;
 922
 923         qdio_kick_handler(q);
 924
 925         if (!qdio_inbound_q_done(q)) {
 926                 qperf_inc(q, tasklet_inbound_resched);
 927                 if (!qdio_tasklet_schedule(q))
 928                         return;
 929         }
 930
 931         qdio_stop_polling(q);
 932         /*
 933          * We need to check again to not lose initiative after
 934          * resetting the ACK state.
 935          */
 936         if (!qdio_inbound_q_done(q)) {
 937                 qperf_inc(q, tasklet_inbound_resched2);
 938                 qdio_tasklet_schedule(q);
 939         }
 940 }
 941
 942 void tiqdio_inbound_processing(unsigned long data)
 943 {
 944         struct qdio_q *q = (struct qdio_q *)data;
 945         __tiqdio_inbound_processing(q);
 946 }
 947
 948 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 949                                   enum qdio_irq_states state)
 950 {
 951         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 952
 953         irq_ptr->state = state;
 954         mb();
 955 }
 956
 957 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 958 {
 959         if (irb->esw.esw0.erw.cons) {
 960                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 961                 DBF_ERROR_HEX(irb, 64);
 962                 DBF_ERROR_HEX(irb->ecw, 64);
 963         }
 964 }
 965
 966 /* PCI interrupt handler */
 967 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 968 {
 969         int i;
 970         struct qdio_q *q;
 971
 972         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 973                 return;
 974
 975         for_each_input_queue(irq_ptr, q, i) {
 976                 if (q->u.in.queue_start_poll) {
 977                         /* skip if polling is enabled or already in work */
 978                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 979                                      &q->u.in.queue_irq_state)) {
 980                                 qperf_inc(q, int_discarded);
 981                                 continue;
 982                         }
 983                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 984                                                  q->irq_ptr->int_parm);
 985                 } else {
 986                         tasklet_schedule(&q->tasklet);
 987                 }
 988         }
 989
 990         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 991                 return;
 992
 993         for_each_output_queue(irq_ptr, q, i) {
 994                 if (qdio_outbound_q_done(q))
 995                         continue;
 996                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 997                         qdio_siga_sync_q(q);
 998                 qdio_tasklet_schedule(q);
 999         }
1000 }
1001
1002 static void qdio_handle_activate_check(struct ccw_device *cdev,
1003                                 unsigned long intparm, int cstat, int dstat)
1004 {
1005         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1006         struct qdio_q *q;
1007         int count;
1008
1009         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1010         DBF_ERROR("intp :%lx", intparm);
1011         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1012
1013         if (irq_ptr->nr_input_qs) {
1014                 q = irq_ptr->input_qs[0];
1015         } else if (irq_ptr->nr_output_qs) {
1016                 q = irq_ptr->output_qs[0];
1017         } else {
1018                 dump_stack();
1019                 goto no_handler;
1020         }
1021
1022         count = sub_buf(q->first_to_check, q->first_to_kick);
1023         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1024                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1025 no_handler:
1026         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1027         /*
1028          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1029          * Therefore we call the LGR detection function here.
1030          */
1031         lgr_info_log();
1032 }
1033
1034 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1035                                       int dstat)
1036 {
1037         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1038
1039         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1040
1041         if (cstat)
1042                 goto error;
1043         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1044                 goto error;
1045         if (!(dstat & DEV_STAT_DEV_END))
1046                 goto error;
1047         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1048         return;
1049
1050 error:
1051         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1052         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1053         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1054 }
1055
1056 /* qdio interrupt handler */
1057 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1058                       struct irb *irb)
1059 {
1060         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1061         struct subchannel_id schid;
1062         int cstat, dstat;
1063
1064         if (!intparm || !irq_ptr) {
1065                 ccw_device_get_schid(cdev, &schid);
1066                 DBF_ERROR("qint:%4x", schid.sch_no);
1067                 return;
1068         }
1069
1070         if (irq_ptr->perf_stat_enabled)
1071                 irq_ptr->perf_stat.qdio_int++;
1072
1073         if (IS_ERR(irb)) {
1074                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1075                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1076                 wake_up(&cdev->private->wait_q);
1077                 return;
1078         }
1079         qdio_irq_check_sense(irq_ptr, irb);
1080         cstat = irb->scsw.cmd.cstat;
1081         dstat = irb->scsw.cmd.dstat;
1082
1083         switch (irq_ptr->state) {
1084         case QDIO_IRQ_STATE_INACTIVE:
1085                 qdio_establish_handle_irq(cdev, cstat, dstat);
1086                 break;
1087         case QDIO_IRQ_STATE_CLEANUP:
1088                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1089                 break;
1090         case QDIO_IRQ_STATE_ESTABLISHED:
1091         case QDIO_IRQ_STATE_ACTIVE:
1092                 if (cstat & SCHN_STAT_PCI) {
1093                         qdio_int_handler_pci(irq_ptr);
1094                         return;
1095                 }
1096                 if (cstat || dstat)
1097                         qdio_handle_activate_check(cdev, intparm, cstat,
1098                                                    dstat);
1099                 break;
1100         case QDIO_IRQ_STATE_STOPPED:
1101                 break;
1102         default:
1103                 WARN_ON_ONCE(1);
1104         }
1105         wake_up(&cdev->private->wait_q);
1106 }
1107
1108 /**
1109  * qdio_get_ssqd_desc - get qdio subchannel description
1110  * @cdev: ccw device to get description for
1111  * @data: where to store the ssqd
1112  *
1113  * Returns 0 or an error code. The results of the chsc are stored in the
1114  * specified structure.
1115  */
1116 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1117                        struct qdio_ssqd_desc *data)
1118 {
1119         struct subchannel_id schid;
1120
1121         if (!cdev || !cdev->private)
1122                 return -EINVAL;
1123
1124         ccw_device_get_schid(cdev, &schid);
1125         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1126         return qdio_setup_get_ssqd(NULL, &schid, data);
1127 }
1128 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1129
1130 static void qdio_shutdown_queues(struct ccw_device *cdev)
1131 {
1132         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1133         struct qdio_q *q;
1134         int i;
1135
1136         for_each_input_queue(irq_ptr, q, i)
1137                 tasklet_kill(&q->tasklet);
1138
1139         for_each_output_queue(irq_ptr, q, i) {
1140                 del_timer_sync(&q->u.out.timer);
1141                 tasklet_kill(&q->tasklet);
1142         }
1143 }
1144
1145 /**
1146  * qdio_shutdown - shut down a qdio subchannel
1147  * @cdev: associated ccw device
1148  * @how: use halt or clear to shutdown
1149  */
1150 int qdio_shutdown(struct ccw_device *cdev, int how)
1151 {
1152         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1153         struct subchannel_id schid;
1154         int rc;
1155
1156         if (!irq_ptr)
1157                 return -ENODEV;
1158
1159         WARN_ON_ONCE(irqs_disabled());
1160         ccw_device_get_schid(cdev, &schid);
1161         DBF_EVENT("qshutdown:%4x", 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         /*
1174          * Indicate that the device is going down. Scheduling the queue
1175          * tasklets is forbidden from here on.
1176          */
1177         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1178
1179         tiqdio_remove_input_queues(irq_ptr);
1180         qdio_shutdown_queues(cdev);
1181         qdio_shutdown_debug_entries(irq_ptr);
1182
1183         /* cleanup subchannel */
1184         spin_lock_irq(get_ccwdev_lock(cdev));
1185
1186         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1187                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1188         else
1189                 /* default behaviour is halt */
1190                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1191         if (rc) {
1192                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1193                 DBF_ERROR("rc:%4d", rc);
1194                 goto no_cleanup;
1195         }
1196
1197         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1198         spin_unlock_irq(get_ccwdev_lock(cdev));
1199         wait_event_interruptible_timeout(cdev->private->wait_q,
1200                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1201                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1202                 10 * HZ);
1203         spin_lock_irq(get_ccwdev_lock(cdev));
1204
1205 no_cleanup:
1206         qdio_shutdown_thinint(irq_ptr);
1207
1208         /* restore interrupt handler */
1209         if ((void *)cdev->handler == (void *)qdio_int_handler) {
1210                 cdev->handler = irq_ptr->orig_handler;
1211                 cdev->private->intparm = 0;
1212         }
1213         spin_unlock_irq(get_ccwdev_lock(cdev));
1214
1215         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1216         mutex_unlock(&irq_ptr->setup_mutex);
1217         if (rc)
1218                 return rc;
1219         return 0;
1220 }
1221 EXPORT_SYMBOL_GPL(qdio_shutdown);
1222
1223 /**
1224  * qdio_free - free data structures for a qdio subchannel
1225  * @cdev: associated ccw device
1226  */
1227 int qdio_free(struct ccw_device *cdev)
1228 {
1229         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1230         struct subchannel_id schid;
1231
1232         if (!irq_ptr)
1233                 return -ENODEV;
1234
1235         ccw_device_get_schid(cdev, &schid);
1236         DBF_EVENT("qfree:%4x", schid.sch_no);
1237         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1238         mutex_lock(&irq_ptr->setup_mutex);
1239
1240         irq_ptr->debug_area = NULL;
1241         cdev->private->qdio_data = NULL;
1242         mutex_unlock(&irq_ptr->setup_mutex);
1243
1244         qdio_release_memory(irq_ptr);
1245         return 0;
1246 }
1247 EXPORT_SYMBOL_GPL(qdio_free);
1248
1249 /**
1250  * qdio_allocate - allocate qdio queues and associated data
1251  * @init_data: initialization data
1252  */
1253 int qdio_allocate(struct qdio_initialize *init_data)
1254 {
1255         struct subchannel_id schid;
1256         struct qdio_irq *irq_ptr;
1257
1258         ccw_device_get_schid(init_data->cdev, &schid);
1259         DBF_EVENT("qallocate:%4x", schid.sch_no);
1260
1261         if ((init_data->no_input_qs && !init_data->input_handler) ||
1262             (init_data->no_output_qs && !init_data->output_handler))
1263                 return -EINVAL;
1264
1265         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1266             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1267                 return -EINVAL;
1268
1269         if ((!init_data->input_sbal_addr_array) ||
1270             (!init_data->output_sbal_addr_array))
1271                 return -EINVAL;
1272
1273         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1274         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1275         if (!irq_ptr)
1276                 goto out_err;
1277
1278         mutex_init(&irq_ptr->setup_mutex);
1279         if (qdio_allocate_dbf(init_data, irq_ptr))
1280                 goto out_rel;
1281
1282         /*
1283          * Allocate a page for the chsc calls in qdio_establish.
1284          * Must be pre-allocated since a zfcp recovery will call
1285          * qdio_establish. In case of low memory and swap on a zfcp disk
1286          * we may not be able to allocate memory otherwise.
1287          */
1288         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1289         if (!irq_ptr->chsc_page)
1290                 goto out_rel;
1291
1292         /* qdr is used in ccw1.cda which is u32 */
1293         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1294         if (!irq_ptr->qdr)
1295                 goto out_rel;
1296
1297         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1298                              init_data->no_output_qs))
1299                 goto out_rel;
1300
1301         init_data->cdev->private->qdio_data = irq_ptr;
1302         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1303         return 0;
1304 out_rel:
1305         qdio_release_memory(irq_ptr);
1306 out_err:
1307         return -ENOMEM;
1308 }
1309 EXPORT_SYMBOL_GPL(qdio_allocate);
1310
1311 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1312 {
1313         struct qdio_q *q = irq_ptr->input_qs[0];
1314         int i, use_cq = 0;
1315
1316         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1317                 use_cq = 1;
1318
1319         for_each_output_queue(irq_ptr, q, i) {
1320                 if (use_cq) {
1321                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1322                                 use_cq = 0;
1323                                 continue;
1324                         }
1325                 } else
1326                         qdio_disable_async_operation(&q->u.out);
1327         }
1328         DBF_EVENT("use_cq:%d", use_cq);
1329 }
1330
1331 /**
1332  * qdio_establish - establish queues on a qdio subchannel
1333  * @init_data: initialization data
1334  */
1335 int qdio_establish(struct qdio_initialize *init_data)
1336 {
1337         struct ccw_device *cdev = init_data->cdev;
1338         struct subchannel_id schid;
1339         struct qdio_irq *irq_ptr;
1340         int rc;
1341
1342         ccw_device_get_schid(cdev, &schid);
1343         DBF_EVENT("qestablish:%4x", schid.sch_no);
1344
1345         irq_ptr = cdev->private->qdio_data;
1346         if (!irq_ptr)
1347                 return -ENODEV;
1348
1349         mutex_lock(&irq_ptr->setup_mutex);
1350         qdio_setup_irq(init_data);
1351
1352         rc = qdio_establish_thinint(irq_ptr);
1353         if (rc) {
1354                 mutex_unlock(&irq_ptr->setup_mutex);
1355                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1356                 return rc;
1357         }
1358
1359         /* establish q */
1360         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1361         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1362         irq_ptr->ccw.count = irq_ptr->equeue.count;
1363         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1364
1365         spin_lock_irq(get_ccwdev_lock(cdev));
1366         ccw_device_set_options_mask(cdev, 0);
1367
1368         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1369         spin_unlock_irq(get_ccwdev_lock(cdev));
1370         if (rc) {
1371                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1372                 DBF_ERROR("rc:%4x", rc);
1373                 mutex_unlock(&irq_ptr->setup_mutex);
1374                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1375                 return rc;
1376         }
1377
1378         wait_event_interruptible_timeout(cdev->private->wait_q,
1379                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1380                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1381
1382         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1383                 mutex_unlock(&irq_ptr->setup_mutex);
1384                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1385                 return -EIO;
1386         }
1387
1388         qdio_setup_ssqd_info(irq_ptr);
1389
1390         qdio_detect_hsicq(irq_ptr);
1391
1392         /* qebsm is now setup if available, initialize buffer states */
1393         qdio_init_buf_states(irq_ptr);
1394
1395         mutex_unlock(&irq_ptr->setup_mutex);
1396         qdio_print_subchannel_info(irq_ptr, cdev);
1397         qdio_setup_debug_entries(irq_ptr, cdev);
1398         return 0;
1399 }
1400 EXPORT_SYMBOL_GPL(qdio_establish);
1401
1402 /**
1403  * qdio_activate - activate queues on a qdio subchannel
1404  * @cdev: associated cdev
1405  */
1406 int qdio_activate(struct ccw_device *cdev)
1407 {
1408         struct subchannel_id schid;
1409         struct qdio_irq *irq_ptr;
1410         int rc;
1411
1412         ccw_device_get_schid(cdev, &schid);
1413         DBF_EVENT("qactivate:%4x", schid.sch_no);
1414
1415         irq_ptr = cdev->private->qdio_data;
1416         if (!irq_ptr)
1417                 return -ENODEV;
1418
1419         mutex_lock(&irq_ptr->setup_mutex);
1420         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1421                 rc = -EBUSY;
1422                 goto out;
1423         }
1424
1425         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1426         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1427         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1428         irq_ptr->ccw.cda = 0;
1429
1430         spin_lock_irq(get_ccwdev_lock(cdev));
1431         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1432
1433         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1434                               0, DOIO_DENY_PREFETCH);
1435         spin_unlock_irq(get_ccwdev_lock(cdev));
1436         if (rc) {
1437                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1438                 DBF_ERROR("rc:%4x", rc);
1439                 goto out;
1440         }
1441
1442         if (is_thinint_irq(irq_ptr))
1443                 tiqdio_add_input_queues(irq_ptr);
1444
1445         /* wait for subchannel to become active */
1446         msleep(5);
1447
1448         switch (irq_ptr->state) {
1449         case QDIO_IRQ_STATE_STOPPED:
1450         case QDIO_IRQ_STATE_ERR:
1451                 rc = -EIO;
1452                 break;
1453         default:
1454                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1455                 rc = 0;
1456         }
1457 out:
1458         mutex_unlock(&irq_ptr->setup_mutex);
1459         return rc;
1460 }
1461 EXPORT_SYMBOL_GPL(qdio_activate);
1462
1463 static inline int buf_in_between(int bufnr, int start, int count)
1464 {
1465         int end = add_buf(start, count);
1466
1467         if (end > start) {
1468                 if (bufnr >= start && bufnr < end)
1469                         return 1;
1470                 else
1471                         return 0;
1472         }
1473
1474         /* wrap-around case */
1475         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1476             (bufnr < end))
1477                 return 1;
1478         else
1479                 return 0;
1480 }
1481
1482 /**
1483  * handle_inbound - reset processed input buffers
1484  * @q: queue containing the buffers
1485  * @callflags: flags
1486  * @bufnr: first buffer to process
1487  * @count: how many buffers are emptied
1488  */
1489 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1490                           int bufnr, int count)
1491 {
1492         int diff;
1493
1494         qperf_inc(q, inbound_call);
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->u.in.ack_start, bufnr, count)) {
1506                 if (is_qebsm(q)) {
1507                         /* partial overwrite, just update ack_start */
1508                         diff = add_buf(bufnr, count);
1509                         diff = sub_buf(diff, q->u.in.ack_start);
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                                 goto set;
1515                         }
1516                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1517                 }
1518                 else
1519                         /* the only ACK will be deleted, so stop polling */
1520                         q->u.in.polling = 0;
1521         }
1522
1523 set:
1524         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1525         atomic_add(count, &q->nr_buf_used);
1526
1527         if (need_siga_in(q))
1528                 return qdio_siga_input(q);
1529
1530         return 0;
1531 }
1532
1533 /**
1534  * handle_outbound - process filled outbound buffers
1535  * @q: queue containing the buffers
1536  * @callflags: flags
1537  * @bufnr: first buffer to process
1538  * @count: how many buffers are filled
1539  */
1540 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1541                            int bufnr, int count)
1542 {
1543         unsigned char state = 0;
1544         int used, rc = 0;
1545
1546         qperf_inc(q, outbound_call);
1547
1548         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1549         used = atomic_add_return(count, &q->nr_buf_used);
1550
1551         if (used == QDIO_MAX_BUFFERS_PER_Q)
1552                 qperf_inc(q, outbound_queue_full);
1553
1554         if (callflags & QDIO_FLAG_PCI_OUT) {
1555                 q->u.out.pci_out_enabled = 1;
1556                 qperf_inc(q, pci_request_int);
1557         } else
1558                 q->u.out.pci_out_enabled = 0;
1559
1560         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1561                 unsigned long phys_aob = 0;
1562
1563                 /* One SIGA-W per buffer required for unicast HSI */
1564                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1565
1566                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1567
1568                 rc = qdio_kick_outbound_q(q, phys_aob);
1569         } else if (need_siga_sync(q)) {
1570                 rc = qdio_siga_sync_q(q);
1571         } else {
1572                 /* try to fast requeue buffers */
1573                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1574                 if (state != SLSB_CU_OUTPUT_PRIMED)
1575                         rc = qdio_kick_outbound_q(q, 0);
1576                 else
1577                         qperf_inc(q, fast_requeue);
1578         }
1579
1580         /* in case of SIGA errors we must process the error immediately */
1581         if (used >= q->u.out.scan_threshold || rc)
1582                 qdio_tasklet_schedule(q);
1583         else
1584                 /* free the SBALs in case of no further traffic */
1585                 if (!timer_pending(&q->u.out.timer) &&
1586                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1587                         mod_timer(&q->u.out.timer, jiffies + HZ);
1588         return rc;
1589 }
1590
1591 /**
1592  * do_QDIO - process input or output buffers
1593  * @cdev: associated ccw_device for the qdio subchannel
1594  * @callflags: input or output and special flags from the program
1595  * @q_nr: queue number
1596  * @bufnr: buffer number
1597  * @count: how many buffers to process
1598  */
1599 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1600             int q_nr, unsigned int bufnr, unsigned int count)
1601 {
1602         struct qdio_irq *irq_ptr;
1603
1604         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1605                 return -EINVAL;
1606
1607         irq_ptr = cdev->private->qdio_data;
1608         if (!irq_ptr)
1609                 return -ENODEV;
1610
1611         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1612                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1613
1614         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1615                 return -EIO;
1616         if (!count)
1617                 return 0;
1618         if (callflags & QDIO_FLAG_SYNC_INPUT)
1619                 return handle_inbound(irq_ptr->input_qs[q_nr],
1620                                       callflags, bufnr, count);
1621         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1622                 return handle_outbound(irq_ptr->output_qs[q_nr],
1623                                        callflags, bufnr, count);
1624         return -EINVAL;
1625 }
1626 EXPORT_SYMBOL_GPL(do_QDIO);
1627
1628 /**
1629  * qdio_start_irq - process input buffers
1630  * @cdev: associated ccw_device for the qdio subchannel
1631  * @nr: input queue number
1632  *
1633  * Return codes
1634  *   0 - success
1635  *   1 - irqs not started since new data is available
1636  */
1637 int qdio_start_irq(struct ccw_device *cdev, int nr)
1638 {
1639         struct qdio_q *q;
1640         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1641
1642         if (!irq_ptr)
1643                 return -ENODEV;
1644         q = irq_ptr->input_qs[nr];
1645
1646         clear_nonshared_ind(irq_ptr);
1647         qdio_stop_polling(q);
1648         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1649
1650         /*
1651          * We need to check again to not lose initiative after
1652          * resetting the ACK state.
1653          */
1654         if (test_nonshared_ind(irq_ptr))
1655                 goto rescan;
1656         if (!qdio_inbound_q_done(q))
1657                 goto rescan;
1658         return 0;
1659
1660 rescan:
1661         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1662                              &q->u.in.queue_irq_state))
1663                 return 0;
1664         else
1665                 return 1;
1666
1667 }
1668 EXPORT_SYMBOL(qdio_start_irq);
1669
1670 /**
1671  * qdio_get_next_buffers - process input buffers
1672  * @cdev: associated ccw_device for the qdio subchannel
1673  * @nr: input queue number
1674  * @bufnr: first filled buffer number
1675  * @error: buffers are in error state
1676  *
1677  * Return codes
1678  *   < 0 - error
1679  *   = 0 - no new buffers found
1680  *   > 0 - number of processed buffers
1681  */
1682 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1683                           int *error)
1684 {
1685         struct qdio_q *q;
1686         int start, end;
1687         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1688
1689         if (!irq_ptr)
1690                 return -ENODEV;
1691         q = irq_ptr->input_qs[nr];
1692
1693         /*
1694          * Cannot rely on automatic sync after interrupt since queues may
1695          * also be examined without interrupt.
1696          */
1697         if (need_siga_sync(q))
1698                 qdio_sync_queues(q);
1699
1700         /* check the PCI capable outbound queues. */
1701         qdio_check_outbound_after_thinint(q);
1702
1703         if (!qdio_inbound_q_moved(q))
1704                 return 0;
1705
1706         /* Note: upper-layer MUST stop processing immediately here ... */
1707         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1708                 return -EIO;
1709
1710         start = q->first_to_kick;
1711         end = q->first_to_check;
1712         *bufnr = start;
1713         *error = q->qdio_error;
1714
1715         /* for the next time */
1716         q->first_to_kick = end;
1717         q->qdio_error = 0;
1718         return sub_buf(end, start);
1719 }
1720 EXPORT_SYMBOL(qdio_get_next_buffers);
1721
1722 /**
1723  * qdio_stop_irq - disable interrupt processing for the device
1724  * @cdev: associated ccw_device for the qdio subchannel
1725  * @nr: input queue number
1726  *
1727  * Return codes
1728  *   0 - interrupts were already disabled
1729  *   1 - interrupts successfully disabled
1730  */
1731 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1732 {
1733         struct qdio_q *q;
1734         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1735
1736         if (!irq_ptr)
1737                 return -ENODEV;
1738         q = irq_ptr->input_qs[nr];
1739
1740         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1741                              &q->u.in.queue_irq_state))
1742                 return 0;
1743         else
1744                 return 1;
1745 }
1746 EXPORT_SYMBOL(qdio_stop_irq);
1747
1748 /**
1749  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1750  * @schid:              Subchannel ID.
1751  * @cnc:                Boolean Change-Notification Control
1752  * @response:           Response code will be stored at this address
1753  * @cb:                 Callback function will be executed for each element
1754  *                      of the address list
1755  * @priv:               Pointer to pass to the callback function.
1756  *
1757  * Performs "Store-network-bridging-information list" operation and calls
1758  * the callback function for every entry in the list. If "change-
1759  * notification-control" is set, further changes in the address list
1760  * will be reported via the IPA command.
1761  */
1762 int qdio_pnso_brinfo(struct subchannel_id schid,
1763                 int cnc, u16 *response,
1764                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1765                                 void *entry),
1766                 void *priv)
1767 {
1768         struct chsc_pnso_area *rr;
1769         int rc;
1770         u32 prev_instance = 0;
1771         int isfirstblock = 1;
1772         int i, size, elems;
1773
1774         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1775         if (rr == NULL)
1776                 return -ENOMEM;
1777         do {
1778                 /* on the first iteration, naihdr.resume_token will be zero */
1779                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1780                 if (rc != 0 && rc != -EBUSY)
1781                         goto out;
1782                 if (rr->response.code != 1) {
1783                         rc = -EIO;
1784                         continue;
1785                 } else
1786                         rc = 0;
1787
1788                 if (cb == NULL)
1789                         continue;
1790
1791                 size = rr->naihdr.naids;
1792                 elems = (rr->response.length -
1793                                 sizeof(struct chsc_header) -
1794                                 sizeof(struct chsc_brinfo_naihdr)) /
1795                                 size;
1796
1797                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1798                         /* Inform the caller that they need to scrap */
1799                         /* the data that was already reported via cb */
1800                                 rc = -EAGAIN;
1801                                 break;
1802                 }
1803                 isfirstblock = 0;
1804                 prev_instance = rr->naihdr.instance;
1805                 for (i = 0; i < elems; i++)
1806                         switch (size) {
1807                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1808                                 (*cb)(priv, l3_ipv6_addr,
1809                                                 &rr->entries.l3_ipv6[i]);
1810                                 break;
1811                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1812                                 (*cb)(priv, l3_ipv4_addr,
1813                                                 &rr->entries.l3_ipv4[i]);
1814                                 break;
1815                         case sizeof(struct qdio_brinfo_entry_l2):
1816                                 (*cb)(priv, l2_addr_lnid,
1817                                                 &rr->entries.l2[i]);
1818                                 break;
1819                         default:
1820                                 WARN_ON_ONCE(1);
1821                                 rc = -EIO;
1822                                 goto out;
1823                         }
1824         } while (rr->response.code == 0x0107 ||  /* channel busy */
1825                   (rr->response.code == 1 && /* list stored */
1826                    /* resume token is non-zero => list incomplete */
1827                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1828         (*response) = rr->response.code;
1829
1830 out:
1831         free_page((unsigned long)rr);
1832         return rc;
1833 }
1834 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1835
1836 static int __init init_QDIO(void)
1837 {
1838         int rc;
1839
1840         rc = qdio_debug_init();
1841         if (rc)
1842                 return rc;
1843         rc = qdio_setup_init();
1844         if (rc)
1845                 goto out_debug;
1846         rc = tiqdio_allocate_memory();
1847         if (rc)
1848                 goto out_cache;
1849         rc = tiqdio_register_thinints();
1850         if (rc)
1851                 goto out_ti;
1852         return 0;
1853
1854 out_ti:
1855         tiqdio_free_memory();
1856 out_cache:
1857         qdio_setup_exit();
1858 out_debug:
1859         qdio_debug_exit();
1860         return rc;
1861 }
1862
1863 static void __exit exit_QDIO(void)
1864 {
1865         tiqdio_unregister_thinints();
1866         tiqdio_free_memory();
1867         qdio_setup_exit();
1868         qdio_debug_exit();
1869 }
1870
1871 module_init(init_QDIO);
1872 module_exit(exit_QDIO);