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