drivers/s390/cio/qdio_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   4  *
   5  * Copyright IBM Corp. 2000, 2008
   6  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   7  *            Jan Glauber <jang@linux.vnet.ibm.com>
   8  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/timer.h>
  14 #include <linux/delay.h>
  15 #include <linux/gfp.h>
  16 #include <linux/io.h>
  17 #include <linux/atomic.h>
  18 #include <asm/debug.h>
  19 #include <asm/qdio.h>
  20 #include <asm/ipl.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  * @aob: asynchronous operation block
  76  *
  77  * Returns condition code.
  78  * Note: For IQDC unicast queues only the highest priority queue is processed.
  79  */
  80 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  81                                  unsigned int *bb, unsigned int fc,
  82                                  unsigned long aob)
  83 {
  84         register unsigned long __fc asm("0") = fc;
  85         register unsigned long __schid asm("1") = schid;
  86         register unsigned long __mask asm("2") = mask;
  87         register unsigned long __aob asm("3") = aob;
  88         int cc;
  89
  90         asm volatile(
  91                 "       siga    0\n"
  92                 "       ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  95                 : "d" (__schid), "d" (__mask)
  96                 : "cc");
  97         *bb = __fc >> 31;
  98         return cc;
  99 }
 100
 101 /**
 102  * qdio_do_eqbs - extract buffer states for QEBSM
 103  * @q: queue to manipulate
 104  * @state: state of the extracted buffers
 105  * @start: buffer number to start at
 106  * @count: count of buffers to examine
 107  * @auto_ack: automatically acknowledge buffers
 108  *
 109  * Returns the number of successfully extracted equal buffer states.
 110  * Stops processing if a state is different from the last buffers state.
 111  */
 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 113                         int start, int count, int auto_ack)
 114 {
 115         int tmp_count = count, tmp_start = start, nr = q->nr;
 116         unsigned int ccq = 0;
 117
 118         qperf_inc(q, eqbs);
 119
 120         if (!q->is_input_q)
 121                 nr += q->irq_ptr->nr_input_qs;
 122 again:
 123         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 124                       auto_ack);
 125
 126         switch (ccq) {
 127         case 0:
 128         case 32:
 129                 /* all done, or next buffer state different */
 130                 return count - tmp_count;
 131         case 96:
 132                 /* not all buffers processed */
 133                 qperf_inc(q, eqbs_partial);
 134                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
 135                         tmp_count);
 136                 return count - tmp_count;
 137         case 97:
 138                 /* no buffer processed */
 139                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 140                 goto again;
 141         default:
 142                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 143                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 144                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 145                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
 146                            q->first_to_check, 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_check, 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)
 206 {
 207         unsigned char __state = 0;
 208         int i = 1;
 209
 210         if (is_qebsm(q))
 211                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 212
 213         /* get initial state: */
 214         __state = q->slsb.val[bufnr];
 215
 216         /* Bail out early if there is no work on the queue: */
 217         if (__state & SLSB_OWNER_CU)
 218                 goto out;
 219
 220         for (; i < count; i++) {
 221                 bufnr = next_buf(bufnr);
 222
 223                 /* stop if next state differs from initial state: */
 224                 if (q->slsb.val[bufnr] != __state)
 225                         break;
 226         }
 227
 228 out:
 229         *state = __state;
 230         return i;
 231 }
 232
 233 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 234                                 unsigned char *state, int auto_ack)
 235 {
 236         return get_buf_states(q, bufnr, state, 1, auto_ack);
 237 }
 238
 239 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 240 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 241                                  unsigned char state, int count)
 242 {
 243         int i;
 244
 245         if (is_qebsm(q))
 246                 return qdio_do_sqbs(q, state, bufnr, count);
 247
 248         /* Ensure that all preceding changes to the SBALs are visible: */
 249         mb();
 250
 251         for (i = 0; i < count; i++) {
 252                 WRITE_ONCE(q->slsb.val[bufnr], state);
 253                 bufnr = next_buf(bufnr);
 254         }
 255
 256         /* Make our SLSB changes visible: */
 257         mb();
 258
 259         return count;
 260 }
 261
 262 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 263                                 unsigned char state)
 264 {
 265         return set_buf_states(q, bufnr, state, 1);
 266 }
 267
 268 /* set slsb states to initial state */
 269 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 270 {
 271         struct qdio_q *q;
 272         int i;
 273
 274         for_each_input_queue(irq_ptr, q, i)
 275                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 276                                QDIO_MAX_BUFFERS_PER_Q);
 277         for_each_output_queue(irq_ptr, q, i)
 278                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 279                                QDIO_MAX_BUFFERS_PER_Q);
 280 }
 281
 282 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 283                           unsigned int input)
 284 {
 285         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 286         unsigned int fc = QDIO_SIGA_SYNC;
 287         int cc;
 288
 289         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 290         qperf_inc(q, siga_sync);
 291
 292         if (is_qebsm(q)) {
 293                 schid = q->irq_ptr->sch_token;
 294                 fc |= QDIO_SIGA_QEBSM_FLAG;
 295         }
 296
 297         cc = do_siga_sync(schid, output, input, fc);
 298         if (unlikely(cc))
 299                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 300         return (cc) ? -EIO : 0;
 301 }
 302
 303 static inline int qdio_siga_sync_q(struct qdio_q *q)
 304 {
 305         if (q->is_input_q)
 306                 return qdio_siga_sync(q, 0, q->mask);
 307         else
 308                 return qdio_siga_sync(q, q->mask, 0);
 309 }
 310
 311 static int qdio_siga_output(struct qdio_q *q, unsigned int count,
 312                             unsigned int *busy_bit, unsigned long aob)
 313 {
 314         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 315         unsigned int fc = QDIO_SIGA_WRITE;
 316         u64 start_time = 0;
 317         int retries = 0, cc;
 318
 319         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
 320                 if (count > 1)
 321                         fc = QDIO_SIGA_WRITEM;
 322                 else if (aob)
 323                         fc = QDIO_SIGA_WRITEQ;
 324         }
 325
 326         if (is_qebsm(q)) {
 327                 schid = q->irq_ptr->sch_token;
 328                 fc |= QDIO_SIGA_QEBSM_FLAG;
 329         }
 330 again:
 331         cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
 332
 333         /* hipersocket busy condition */
 334         if (unlikely(*busy_bit)) {
 335                 retries++;
 336
 337                 if (!start_time) {
 338                         start_time = get_tod_clock_fast();
 339                         goto again;
 340                 }
 341                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 342                         goto again;
 343         }
 344         if (retries) {
 345                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 346                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 347                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 348         }
 349         return cc;
 350 }
 351
 352 static inline int qdio_siga_input(struct qdio_q *q)
 353 {
 354         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 355         unsigned int fc = QDIO_SIGA_READ;
 356         int cc;
 357
 358         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 359         qperf_inc(q, siga_read);
 360
 361         if (is_qebsm(q)) {
 362                 schid = q->irq_ptr->sch_token;
 363                 fc |= QDIO_SIGA_QEBSM_FLAG;
 364         }
 365
 366         cc = do_siga_input(schid, q->mask, fc);
 367         if (unlikely(cc))
 368                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 369         return (cc) ? -EIO : 0;
 370 }
 371
 372 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 373 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 374
 375 static inline void qdio_sync_queues(struct qdio_q *q)
 376 {
 377         /* PCI capable outbound queues will also be scanned so sync them too */
 378         if (pci_out_supported(q->irq_ptr))
 379                 qdio_siga_sync_all(q);
 380         else
 381                 qdio_siga_sync_q(q);
 382 }
 383
 384 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 385                         unsigned char *state)
 386 {
 387         if (need_siga_sync(q))
 388                 qdio_siga_sync_q(q);
 389         return get_buf_state(q, bufnr, state, 0);
 390 }
 391
 392 static inline void qdio_stop_polling(struct qdio_q *q)
 393 {
 394         if (!q->u.in.batch_count)
 395                 return;
 396
 397         qperf_inc(q, stop_polling);
 398
 399         /* show the card that we are not polling anymore */
 400         set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
 401                        q->u.in.batch_count);
 402         q->u.in.batch_count = 0;
 403 }
 404
 405 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 406 {
 407         q->q_stats.nr_sbal_total += count;
 408         q->q_stats.nr_sbals[ilog2(count)]++;
 409 }
 410
 411 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 412                                  int count)
 413 {
 414         /* special handling for no target buffer empty */
 415         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 416             q->sbal[start]->element[15].sflags == 0x10) {
 417                 qperf_inc(q, target_full);
 418                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 419                 return;
 420         }
 421
 422         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 423         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 424         DBF_ERROR("FTC:%3d C:%3d", start, count);
 425         DBF_ERROR("F14:%2x F15:%2x",
 426                   q->sbal[start]->element[14].sflags,
 427                   q->sbal[start]->element[15].sflags);
 428 }
 429
 430 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
 431                                        int count, bool auto_ack)
 432 {
 433         /* ACK the newest SBAL: */
 434         if (!auto_ack)
 435                 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
 436
 437         if (!q->u.in.batch_count)
 438                 q->u.in.batch_start = start;
 439         q->u.in.batch_count += count;
 440 }
 441
 442 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start,
 443                                        unsigned int *error)
 444 {
 445         unsigned char state = 0;
 446         int count;
 447
 448         q->timestamp = get_tod_clock_fast();
 449
 450         count = atomic_read(&q->nr_buf_used);
 451         if (!count)
 452                 return 0;
 453
 454         /*
 455          * No siga sync here, as a PCI or we after a thin interrupt
 456          * already sync'ed the queues.
 457          */
 458         count = get_buf_states(q, start, &state, count, 1);
 459         if (!count)
 460                 return 0;
 461
 462         switch (state) {
 463         case SLSB_P_INPUT_PRIMED:
 464                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
 465                               count);
 466
 467                 inbound_handle_work(q, start, count, is_qebsm(q));
 468                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 469                         qperf_inc(q, inbound_queue_full);
 470                 if (q->irq_ptr->perf_stat_enabled)
 471                         account_sbals(q, count);
 472                 return count;
 473         case SLSB_P_INPUT_ERROR:
 474                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
 475                               count);
 476
 477                 *error = QDIO_ERROR_SLSB_STATE;
 478                 process_buffer_error(q, start, count);
 479                 inbound_handle_work(q, start, count, false);
 480                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 481                         qperf_inc(q, inbound_queue_full);
 482                 if (q->irq_ptr->perf_stat_enabled)
 483                         account_sbals_error(q, count);
 484                 return count;
 485         case SLSB_CU_INPUT_EMPTY:
 486                 if (q->irq_ptr->perf_stat_enabled)
 487                         q->q_stats.nr_sbal_nop++;
 488                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 489                               q->nr, start);
 490                 return 0;
 491         case SLSB_P_INPUT_NOT_INIT:
 492         case SLSB_P_INPUT_ACK:
 493                 /* We should never see this state, throw a WARN: */
 494         default:
 495                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 496                               "found state %#x at index %u on queue %u\n",
 497                               state, start, q->nr);
 498                 return 0;
 499         }
 500 }
 501
 502 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 503 {
 504         unsigned char state = 0;
 505
 506         if (!atomic_read(&q->nr_buf_used))
 507                 return 1;
 508
 509         if (need_siga_sync(q))
 510                 qdio_siga_sync_q(q);
 511         get_buf_state(q, start, &state, 0);
 512
 513         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 514                 /* more work coming */
 515                 return 0;
 516
 517         return 1;
 518 }
 519
 520 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 521 {
 522         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 523                 tasklet_schedule(&q->u.out.tasklet);
 524                 return 0;
 525         }
 526         return -EPERM;
 527 }
 528
 529 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start,
 530                                         unsigned int *error)
 531 {
 532         unsigned char state = 0;
 533         int count;
 534
 535         q->timestamp = get_tod_clock_fast();
 536
 537         if (need_siga_sync(q))
 538                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 539                     !pci_out_supported(q->irq_ptr)) ||
 540                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 541                     multicast_outbound(q)))
 542                         qdio_siga_sync_q(q);
 543
 544         count = atomic_read(&q->nr_buf_used);
 545         if (!count)
 546                 return 0;
 547
 548         count = get_buf_states(q, start, &state, count, 0);
 549         if (!count)
 550                 return 0;
 551
 552         switch (state) {
 553         case SLSB_P_OUTPUT_PENDING:
 554                 *error = QDIO_ERROR_SLSB_PENDING;
 555                 fallthrough;
 556         case SLSB_P_OUTPUT_EMPTY:
 557                 /* the adapter got it */
 558                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 559                         "out empty:%1d %02x", q->nr, count);
 560
 561                 atomic_sub(count, &q->nr_buf_used);
 562                 if (q->irq_ptr->perf_stat_enabled)
 563                         account_sbals(q, count);
 564                 return count;
 565         case SLSB_P_OUTPUT_ERROR:
 566                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out error:%1d %02x",
 567                               q->nr, count);
 568
 569                 *error = QDIO_ERROR_SLSB_STATE;
 570                 process_buffer_error(q, start, count);
 571                 atomic_sub(count, &q->nr_buf_used);
 572                 if (q->irq_ptr->perf_stat_enabled)
 573                         account_sbals_error(q, count);
 574                 return count;
 575         case SLSB_CU_OUTPUT_PRIMED:
 576                 /* the adapter has not fetched the output yet */
 577                 if (q->irq_ptr->perf_stat_enabled)
 578                         q->q_stats.nr_sbal_nop++;
 579                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 580                               q->nr);
 581                 return 0;
 582         case SLSB_P_OUTPUT_HALTED:
 583                 return 0;
 584         case SLSB_P_OUTPUT_NOT_INIT:
 585                 /* We should never see this state, throw a WARN: */
 586         default:
 587                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 588                               "found state %#x at index %u on queue %u\n",
 589                               state, start, q->nr);
 590                 return 0;
 591         }
 592 }
 593
 594 /* all buffers processed? */
 595 static inline int qdio_outbound_q_done(struct qdio_q *q)
 596 {
 597         return atomic_read(&q->nr_buf_used) == 0;
 598 }
 599
 600 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 601                                 unsigned long aob)
 602 {
 603         int retries = 0, cc;
 604         unsigned int busy_bit;
 605
 606         if (!need_siga_out(q))
 607                 return 0;
 608
 609         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 610 retry:
 611         qperf_inc(q, siga_write);
 612
 613         cc = qdio_siga_output(q, count, &busy_bit, aob);
 614         switch (cc) {
 615         case 0:
 616                 break;
 617         case 2:
 618                 if (busy_bit) {
 619                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 620                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 621                                 goto retry;
 622                         }
 623                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 624                         cc = -EBUSY;
 625                 } else {
 626                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 627                         cc = -ENOBUFS;
 628                 }
 629                 break;
 630         case 1:
 631         case 3:
 632                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 633                 cc = -EIO;
 634                 break;
 635         }
 636         if (retries) {
 637                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 638                 DBF_ERROR("count:%u", retries);
 639         }
 640         return cc;
 641 }
 642
 643 void qdio_outbound_tasklet(struct tasklet_struct *t)
 644 {
 645         struct qdio_output_q *out_q = from_tasklet(out_q, t, tasklet);
 646         struct qdio_q *q = container_of(out_q, struct qdio_q, u.out);
 647         unsigned int start = q->first_to_check;
 648         unsigned int error = 0;
 649         int count;
 650
 651         qperf_inc(q, tasklet_outbound);
 652         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 653
 654         count = get_outbound_buffer_frontier(q, start, &error);
 655         if (count) {
 656                 q->first_to_check = add_buf(start, count);
 657
 658                 if (q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE) {
 659                         qperf_inc(q, outbound_handler);
 660                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 661                                       start, count);
 662
 663                         q->handler(q->irq_ptr->cdev, error, q->nr, start,
 664                                    count, q->irq_ptr->int_parm);
 665                 }
 666         }
 667
 668         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 669             !qdio_outbound_q_done(q))
 670                 goto sched;
 671
 672         if (q->u.out.pci_out_enabled)
 673                 return;
 674
 675         /*
 676          * Now we know that queue type is either qeth without pci enabled
 677          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 678          * is noticed and outbound_handler is called after some time.
 679          */
 680         if (qdio_outbound_q_done(q))
 681                 del_timer_sync(&q->u.out.timer);
 682         else
 683                 if (!timer_pending(&q->u.out.timer) &&
 684                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 685                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 686         return;
 687
 688 sched:
 689         qdio_tasklet_schedule(q);
 690 }
 691
 692 void qdio_outbound_timer(struct timer_list *t)
 693 {
 694         struct qdio_q *q = from_timer(q, t, u.out.timer);
 695
 696         qdio_tasklet_schedule(q);
 697 }
 698
 699 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 700 {
 701         struct qdio_q *out;
 702         int i;
 703
 704         if (!pci_out_supported(irq) || !irq->scan_threshold)
 705                 return;
 706
 707         for_each_output_queue(irq, out, i)
 708                 if (!qdio_outbound_q_done(out))
 709                         qdio_tasklet_schedule(out);
 710 }
 711
 712 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 713                                   enum qdio_irq_states state)
 714 {
 715         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 716
 717         irq_ptr->state = state;
 718         mb();
 719 }
 720
 721 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 722 {
 723         if (irb->esw.esw0.erw.cons) {
 724                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 725                 DBF_ERROR_HEX(irb, 64);
 726                 DBF_ERROR_HEX(irb->ecw, 64);
 727         }
 728 }
 729
 730 /* PCI interrupt handler */
 731 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 732 {
 733         int i;
 734         struct qdio_q *q;
 735
 736         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 737                 return;
 738
 739         qdio_deliver_irq(irq_ptr);
 740         irq_ptr->last_data_irq_time = S390_lowcore.int_clock;
 741
 742         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 743                 return;
 744
 745         for_each_output_queue(irq_ptr, q, i) {
 746                 if (qdio_outbound_q_done(q))
 747                         continue;
 748                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 749                         qdio_siga_sync_q(q);
 750                 qdio_tasklet_schedule(q);
 751         }
 752 }
 753
 754 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
 755                                        unsigned long intparm, int cstat,
 756                                        int dstat)
 757 {
 758         struct qdio_q *q;
 759
 760         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 761         DBF_ERROR("intp :%lx", intparm);
 762         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 763
 764         if (irq_ptr->nr_input_qs) {
 765                 q = irq_ptr->input_qs[0];
 766         } else if (irq_ptr->nr_output_qs) {
 767                 q = irq_ptr->output_qs[0];
 768         } else {
 769                 dump_stack();
 770                 goto no_handler;
 771         }
 772
 773         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
 774                    q->nr, q->first_to_check, 0, irq_ptr->int_parm);
 775 no_handler:
 776         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 777         /*
 778          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 779          * Therefore we call the LGR detection function here.
 780          */
 781         lgr_info_log();
 782 }
 783
 784 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
 785                                       int dstat)
 786 {
 787         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 788
 789         if (cstat)
 790                 goto error;
 791         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 792                 goto error;
 793         if (!(dstat & DEV_STAT_DEV_END))
 794                 goto error;
 795         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 796         return;
 797
 798 error:
 799         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 800         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 801         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 802 }
 803
 804 /* qdio interrupt handler */
 805 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 806                       struct irb *irb)
 807 {
 808         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 809         struct subchannel_id schid;
 810         int cstat, dstat;
 811
 812         if (!intparm || !irq_ptr) {
 813                 ccw_device_get_schid(cdev, &schid);
 814                 DBF_ERROR("qint:%4x", schid.sch_no);
 815                 return;
 816         }
 817
 818         if (irq_ptr->perf_stat_enabled)
 819                 irq_ptr->perf_stat.qdio_int++;
 820
 821         if (IS_ERR(irb)) {
 822                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 823                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 824                 wake_up(&cdev->private->wait_q);
 825                 return;
 826         }
 827         qdio_irq_check_sense(irq_ptr, irb);
 828         cstat = irb->scsw.cmd.cstat;
 829         dstat = irb->scsw.cmd.dstat;
 830
 831         switch (irq_ptr->state) {
 832         case QDIO_IRQ_STATE_INACTIVE:
 833                 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
 834                 break;
 835         case QDIO_IRQ_STATE_CLEANUP:
 836                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 837                 break;
 838         case QDIO_IRQ_STATE_ESTABLISHED:
 839         case QDIO_IRQ_STATE_ACTIVE:
 840                 if (cstat & SCHN_STAT_PCI) {
 841                         qdio_int_handler_pci(irq_ptr);
 842                         return;
 843                 }
 844                 if (cstat || dstat)
 845                         qdio_handle_activate_check(irq_ptr, intparm, cstat,
 846                                                    dstat);
 847                 break;
 848         case QDIO_IRQ_STATE_STOPPED:
 849                 break;
 850         default:
 851                 WARN_ON_ONCE(1);
 852         }
 853         wake_up(&cdev->private->wait_q);
 854 }
 855
 856 /**
 857  * qdio_get_ssqd_desc - get qdio subchannel description
 858  * @cdev: ccw device to get description for
 859  * @data: where to store the ssqd
 860  *
 861  * Returns 0 or an error code. The results of the chsc are stored in the
 862  * specified structure.
 863  */
 864 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 865                        struct qdio_ssqd_desc *data)
 866 {
 867         struct subchannel_id schid;
 868
 869         if (!cdev || !cdev->private)
 870                 return -EINVAL;
 871
 872         ccw_device_get_schid(cdev, &schid);
 873         DBF_EVENT("get ssqd:%4x", schid.sch_no);
 874         return qdio_setup_get_ssqd(NULL, &schid, data);
 875 }
 876 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 877
 878 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
 879 {
 880         struct qdio_q *q;
 881         int i;
 882
 883         for_each_output_queue(irq_ptr, q, i) {
 884                 del_timer_sync(&q->u.out.timer);
 885                 tasklet_kill(&q->u.out.tasklet);
 886         }
 887 }
 888
 889 /**
 890  * qdio_shutdown - shut down a qdio subchannel
 891  * @cdev: associated ccw device
 892  * @how: use halt or clear to shutdown
 893  */
 894 int qdio_shutdown(struct ccw_device *cdev, int how)
 895 {
 896         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 897         struct subchannel_id schid;
 898         int rc;
 899
 900         if (!irq_ptr)
 901                 return -ENODEV;
 902
 903         WARN_ON_ONCE(irqs_disabled());
 904         ccw_device_get_schid(cdev, &schid);
 905         DBF_EVENT("qshutdown:%4x", schid.sch_no);
 906
 907         mutex_lock(&irq_ptr->setup_mutex);
 908         /*
 909          * Subchannel was already shot down. We cannot prevent being called
 910          * twice since cio may trigger a shutdown asynchronously.
 911          */
 912         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
 913                 mutex_unlock(&irq_ptr->setup_mutex);
 914                 return 0;
 915         }
 916
 917         /*
 918          * Indicate that the device is going down. Scheduling the queue
 919          * tasklets is forbidden from here on.
 920          */
 921         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 922
 923         qdio_shutdown_queues(irq_ptr);
 924         qdio_shutdown_debug_entries(irq_ptr);
 925
 926         /* cleanup subchannel */
 927         spin_lock_irq(get_ccwdev_lock(cdev));
 928         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
 929         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
 930                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
 931         else
 932                 /* default behaviour is halt */
 933                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
 934         spin_unlock_irq(get_ccwdev_lock(cdev));
 935         if (rc) {
 936                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
 937                 DBF_ERROR("rc:%4d", rc);
 938                 goto no_cleanup;
 939         }
 940
 941         wait_event_interruptible_timeout(cdev->private->wait_q,
 942                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
 943                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
 944                 10 * HZ);
 945
 946 no_cleanup:
 947         qdio_shutdown_thinint(irq_ptr);
 948         qdio_shutdown_irq(irq_ptr);
 949
 950         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 951         mutex_unlock(&irq_ptr->setup_mutex);
 952         if (rc)
 953                 return rc;
 954         return 0;
 955 }
 956 EXPORT_SYMBOL_GPL(qdio_shutdown);
 957
 958 /**
 959  * qdio_free - free data structures for a qdio subchannel
 960  * @cdev: associated ccw device
 961  */
 962 int qdio_free(struct ccw_device *cdev)
 963 {
 964         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 965         struct subchannel_id schid;
 966
 967         if (!irq_ptr)
 968                 return -ENODEV;
 969
 970         ccw_device_get_schid(cdev, &schid);
 971         DBF_EVENT("qfree:%4x", schid.sch_no);
 972         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
 973         mutex_lock(&irq_ptr->setup_mutex);
 974
 975         irq_ptr->debug_area = NULL;
 976         cdev->private->qdio_data = NULL;
 977         mutex_unlock(&irq_ptr->setup_mutex);
 978
 979         qdio_free_queues(irq_ptr);
 980         free_page((unsigned long) irq_ptr->qdr);
 981         free_page(irq_ptr->chsc_page);
 982         free_page((unsigned long) irq_ptr);
 983         return 0;
 984 }
 985 EXPORT_SYMBOL_GPL(qdio_free);
 986
 987 /**
 988  * qdio_allocate - allocate qdio queues and associated data
 989  * @cdev: associated ccw device
 990  * @no_input_qs: allocate this number of Input Queues
 991  * @no_output_qs: allocate this number of Output Queues
 992  */
 993 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
 994                   unsigned int no_output_qs)
 995 {
 996         struct subchannel_id schid;
 997         struct qdio_irq *irq_ptr;
 998         int rc = -ENOMEM;
 999
1000         ccw_device_get_schid(cdev, &schid);
1001         DBF_EVENT("qallocate:%4x", schid.sch_no);
1002
1003         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
1004             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
1005                 return -EINVAL;
1006
1007         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1008         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1009         if (!irq_ptr)
1010                 return -ENOMEM;
1011
1012         irq_ptr->cdev = cdev;
1013         mutex_init(&irq_ptr->setup_mutex);
1014         if (qdio_allocate_dbf(irq_ptr))
1015                 goto err_dbf;
1016
1017         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
1018                       no_output_qs);
1019
1020         /*
1021          * Allocate a page for the chsc calls in qdio_establish.
1022          * Must be pre-allocated since a zfcp recovery will call
1023          * qdio_establish. In case of low memory and swap on a zfcp disk
1024          * we may not be able to allocate memory otherwise.
1025          */
1026         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1027         if (!irq_ptr->chsc_page)
1028                 goto err_chsc;
1029
1030         /* qdr is used in ccw1.cda which is u32 */
1031         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1032         if (!irq_ptr->qdr)
1033                 goto err_qdr;
1034
1035         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
1036         if (rc)
1037                 goto err_queues;
1038
1039         cdev->private->qdio_data = irq_ptr;
1040         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1041         return 0;
1042
1043 err_queues:
1044         free_page((unsigned long) irq_ptr->qdr);
1045 err_qdr:
1046         free_page(irq_ptr->chsc_page);
1047 err_chsc:
1048 err_dbf:
1049         free_page((unsigned long) irq_ptr);
1050         return rc;
1051 }
1052 EXPORT_SYMBOL_GPL(qdio_allocate);
1053
1054 static void qdio_trace_init_data(struct qdio_irq *irq,
1055                                  struct qdio_initialize *data)
1056 {
1057         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1058         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1059         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1060         DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR);
1061         DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR);
1062         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1063                       data->no_output_qs);
1064         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1065         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1066         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1067         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1068         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1069                     DBF_ERR);
1070 }
1071
1072 /**
1073  * qdio_establish - establish queues on a qdio subchannel
1074  * @cdev: associated ccw device
1075  * @init_data: initialization data
1076  */
1077 int qdio_establish(struct ccw_device *cdev,
1078                    struct qdio_initialize *init_data)
1079 {
1080         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1081         struct subchannel_id schid;
1082         int rc;
1083
1084         ccw_device_get_schid(cdev, &schid);
1085         DBF_EVENT("qestablish:%4x", schid.sch_no);
1086
1087         if (!irq_ptr)
1088                 return -ENODEV;
1089
1090         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1091             init_data->no_output_qs > irq_ptr->max_output_qs)
1092                 return -EINVAL;
1093
1094         if ((init_data->no_input_qs && !init_data->input_handler) ||
1095             (init_data->no_output_qs && !init_data->output_handler))
1096                 return -EINVAL;
1097
1098         if (!init_data->input_sbal_addr_array ||
1099             !init_data->output_sbal_addr_array)
1100                 return -EINVAL;
1101
1102         if (!init_data->irq_poll)
1103                 return -EINVAL;
1104
1105         mutex_lock(&irq_ptr->setup_mutex);
1106         qdio_trace_init_data(irq_ptr, init_data);
1107         qdio_setup_irq(irq_ptr, init_data);
1108
1109         rc = qdio_establish_thinint(irq_ptr);
1110         if (rc) {
1111                 qdio_shutdown_irq(irq_ptr);
1112                 mutex_unlock(&irq_ptr->setup_mutex);
1113                 return rc;
1114         }
1115
1116         /* establish q */
1117         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1118         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1119         irq_ptr->ccw.count = irq_ptr->equeue.count;
1120         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1121
1122         spin_lock_irq(get_ccwdev_lock(cdev));
1123         ccw_device_set_options_mask(cdev, 0);
1124
1125         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1126         spin_unlock_irq(get_ccwdev_lock(cdev));
1127         if (rc) {
1128                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1129                 DBF_ERROR("rc:%4x", rc);
1130                 qdio_shutdown_thinint(irq_ptr);
1131                 qdio_shutdown_irq(irq_ptr);
1132                 mutex_unlock(&irq_ptr->setup_mutex);
1133                 return rc;
1134         }
1135
1136         wait_event_interruptible_timeout(cdev->private->wait_q,
1137                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1138                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1139
1140         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1141                 mutex_unlock(&irq_ptr->setup_mutex);
1142                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1143                 return -EIO;
1144         }
1145
1146         qdio_setup_ssqd_info(irq_ptr);
1147
1148         /* qebsm is now setup if available, initialize buffer states */
1149         qdio_init_buf_states(irq_ptr);
1150
1151         mutex_unlock(&irq_ptr->setup_mutex);
1152         qdio_print_subchannel_info(irq_ptr);
1153         qdio_setup_debug_entries(irq_ptr);
1154         return 0;
1155 }
1156 EXPORT_SYMBOL_GPL(qdio_establish);
1157
1158 /**
1159  * qdio_activate - activate queues on a qdio subchannel
1160  * @cdev: associated cdev
1161  */
1162 int qdio_activate(struct ccw_device *cdev)
1163 {
1164         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1165         struct subchannel_id schid;
1166         int rc;
1167
1168         ccw_device_get_schid(cdev, &schid);
1169         DBF_EVENT("qactivate:%4x", schid.sch_no);
1170
1171         if (!irq_ptr)
1172                 return -ENODEV;
1173
1174         mutex_lock(&irq_ptr->setup_mutex);
1175         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1176                 rc = -EBUSY;
1177                 goto out;
1178         }
1179
1180         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1181         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1182         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1183         irq_ptr->ccw.cda = 0;
1184
1185         spin_lock_irq(get_ccwdev_lock(cdev));
1186         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1187
1188         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1189                               0, DOIO_DENY_PREFETCH);
1190         spin_unlock_irq(get_ccwdev_lock(cdev));
1191         if (rc) {
1192                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1193                 DBF_ERROR("rc:%4x", rc);
1194                 goto out;
1195         }
1196
1197         /* wait for subchannel to become active */
1198         msleep(5);
1199
1200         switch (irq_ptr->state) {
1201         case QDIO_IRQ_STATE_STOPPED:
1202         case QDIO_IRQ_STATE_ERR:
1203                 rc = -EIO;
1204                 break;
1205         default:
1206                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1207                 rc = 0;
1208         }
1209 out:
1210         mutex_unlock(&irq_ptr->setup_mutex);
1211         return rc;
1212 }
1213 EXPORT_SYMBOL_GPL(qdio_activate);
1214
1215 /**
1216  * handle_inbound - reset processed input buffers
1217  * @q: queue containing the buffers
1218  * @callflags: flags
1219  * @bufnr: first buffer to process
1220  * @count: how many buffers are emptied
1221  */
1222 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1223                           int bufnr, int count)
1224 {
1225         int overlap;
1226
1227         qperf_inc(q, inbound_call);
1228
1229         /* If any processed SBALs are returned to HW, adjust our tracking: */
1230         overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1231                              q->u.in.batch_count);
1232         if (overlap > 0) {
1233                 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1234                 q->u.in.batch_count -= overlap;
1235         }
1236
1237         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1238         atomic_add(count, &q->nr_buf_used);
1239
1240         if (need_siga_in(q))
1241                 return qdio_siga_input(q);
1242
1243         return 0;
1244 }
1245
1246 /**
1247  * handle_outbound - process filled outbound buffers
1248  * @q: queue containing the buffers
1249  * @callflags: flags
1250  * @bufnr: first buffer to process
1251  * @count: how many buffers are filled
1252  * @aob: asynchronous operation block
1253  */
1254 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1255                            unsigned int bufnr, unsigned int count,
1256                            struct qaob *aob)
1257 {
1258         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1259         unsigned char state = 0;
1260         int used, rc = 0;
1261
1262         qperf_inc(q, outbound_call);
1263
1264         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1265         used = atomic_add_return(count, &q->nr_buf_used);
1266
1267         if (used == QDIO_MAX_BUFFERS_PER_Q)
1268                 qperf_inc(q, outbound_queue_full);
1269
1270         if (callflags & QDIO_FLAG_PCI_OUT) {
1271                 q->u.out.pci_out_enabled = 1;
1272                 qperf_inc(q, pci_request_int);
1273         } else
1274                 q->u.out.pci_out_enabled = 0;
1275
1276         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1277                 unsigned long phys_aob = aob ? virt_to_phys(aob) : 0;
1278
1279                 WARN_ON_ONCE(!IS_ALIGNED(phys_aob, 256));
1280                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1281         } else if (need_siga_sync(q)) {
1282                 rc = qdio_siga_sync_q(q);
1283         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1284                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1285                    state == SLSB_CU_OUTPUT_PRIMED) {
1286                 /* The previous buffer is not processed yet, tack on. */
1287                 qperf_inc(q, fast_requeue);
1288         } else {
1289                 rc = qdio_kick_outbound_q(q, count, 0);
1290         }
1291
1292         /* Let drivers implement their own completion scanning: */
1293         if (!scan_threshold)
1294                 return rc;
1295
1296         /* in case of SIGA errors we must process the error immediately */
1297         if (used >= scan_threshold || rc)
1298                 qdio_tasklet_schedule(q);
1299         else
1300                 /* free the SBALs in case of no further traffic */
1301                 if (!timer_pending(&q->u.out.timer) &&
1302                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1303                         mod_timer(&q->u.out.timer, jiffies + HZ);
1304         return rc;
1305 }
1306
1307 /**
1308  * do_QDIO - process input or output buffers
1309  * @cdev: associated ccw_device for the qdio subchannel
1310  * @callflags: input or output and special flags from the program
1311  * @q_nr: queue number
1312  * @bufnr: buffer number
1313  * @count: how many buffers to process
1314  * @aob: asynchronous operation block (outbound only)
1315  */
1316 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1317             int q_nr, unsigned int bufnr, unsigned int count, struct qaob *aob)
1318 {
1319         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1320
1321         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1322                 return -EINVAL;
1323
1324         if (!irq_ptr)
1325                 return -ENODEV;
1326
1327         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1328                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1329
1330         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1331                 return -EIO;
1332         if (!count)
1333                 return 0;
1334         if (callflags & QDIO_FLAG_SYNC_INPUT)
1335                 return handle_inbound(irq_ptr->input_qs[q_nr],
1336                                       callflags, bufnr, count);
1337         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1338                 return handle_outbound(irq_ptr->output_qs[q_nr],
1339                                        callflags, bufnr, count, aob);
1340         return -EINVAL;
1341 }
1342 EXPORT_SYMBOL_GPL(do_QDIO);
1343
1344 /**
1345  * qdio_start_irq - enable interrupt processing for the device
1346  * @cdev: associated ccw_device for the qdio subchannel
1347  *
1348  * Return codes
1349  *   0 - success
1350  *   1 - irqs not started since new data is available
1351  */
1352 int qdio_start_irq(struct ccw_device *cdev)
1353 {
1354         struct qdio_q *q;
1355         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1356         unsigned int i;
1357
1358         if (!irq_ptr)
1359                 return -ENODEV;
1360
1361         for_each_input_queue(irq_ptr, q, i)
1362                 qdio_stop_polling(q);
1363
1364         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1365
1366         /*
1367          * We need to check again to not lose initiative after
1368          * resetting the ACK state.
1369          */
1370         if (test_nonshared_ind(irq_ptr))
1371                 goto rescan;
1372
1373         for_each_input_queue(irq_ptr, q, i) {
1374                 if (!qdio_inbound_q_done(q, q->first_to_check))
1375                         goto rescan;
1376         }
1377
1378         return 0;
1379
1380 rescan:
1381         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1382                 return 0;
1383         else
1384                 return 1;
1385
1386 }
1387 EXPORT_SYMBOL(qdio_start_irq);
1388
1389 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1390                                 unsigned int *error)
1391 {
1392         unsigned int start = q->first_to_check;
1393         int count;
1394
1395         *error = 0;
1396         count = q->is_input_q ? get_inbound_buffer_frontier(q, start, error) :
1397                                 get_outbound_buffer_frontier(q, start, error);
1398         if (count == 0)
1399                 return 0;
1400
1401         *bufnr = start;
1402
1403         /* for the next time */
1404         q->first_to_check = add_buf(start, count);
1405
1406         return count;
1407 }
1408
1409 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1410                        unsigned int *bufnr, unsigned int *error)
1411 {
1412         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1413         struct qdio_q *q;
1414
1415         if (!irq_ptr)
1416                 return -ENODEV;
1417         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1418
1419         if (need_siga_sync(q))
1420                 qdio_siga_sync_q(q);
1421
1422         return __qdio_inspect_queue(q, bufnr, error);
1423 }
1424 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1425
1426 /**
1427  * qdio_get_next_buffers - process input buffers
1428  * @cdev: associated ccw_device for the qdio subchannel
1429  * @nr: input queue number
1430  * @bufnr: first filled buffer number
1431  * @error: buffers are in error state
1432  *
1433  * Return codes
1434  *   < 0 - error
1435  *   = 0 - no new buffers found
1436  *   > 0 - number of processed buffers
1437  */
1438 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1439                           int *error)
1440 {
1441         struct qdio_q *q;
1442         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1443
1444         if (!irq_ptr)
1445                 return -ENODEV;
1446         q = irq_ptr->input_qs[nr];
1447
1448         /*
1449          * Cannot rely on automatic sync after interrupt since queues may
1450          * also be examined without interrupt.
1451          */
1452         if (need_siga_sync(q))
1453                 qdio_sync_queues(q);
1454
1455         qdio_check_outbound_pci_queues(irq_ptr);
1456
1457         /* Note: upper-layer MUST stop processing immediately here ... */
1458         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1459                 return -EIO;
1460
1461         return __qdio_inspect_queue(q, bufnr, error);
1462 }
1463 EXPORT_SYMBOL(qdio_get_next_buffers);
1464
1465 /**
1466  * qdio_stop_irq - disable interrupt processing for the device
1467  * @cdev: associated ccw_device for the qdio subchannel
1468  *
1469  * Return codes
1470  *   0 - interrupts were already disabled
1471  *   1 - interrupts successfully disabled
1472  */
1473 int qdio_stop_irq(struct ccw_device *cdev)
1474 {
1475         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1476
1477         if (!irq_ptr)
1478                 return -ENODEV;
1479
1480         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1481                 return 0;
1482         else
1483                 return 1;
1484 }
1485 EXPORT_SYMBOL(qdio_stop_irq);
1486
1487 static int __init init_QDIO(void)
1488 {
1489         int rc;
1490
1491         rc = qdio_debug_init();
1492         if (rc)
1493                 return rc;
1494         rc = qdio_setup_init();
1495         if (rc)
1496                 goto out_debug;
1497         rc = qdio_thinint_init();
1498         if (rc)
1499                 goto out_cache;
1500         return 0;
1501
1502 out_cache:
1503         qdio_setup_exit();
1504 out_debug:
1505         qdio_debug_exit();
1506         return rc;
1507 }
1508
1509 static void __exit exit_QDIO(void)
1510 {
1511         qdio_thinint_exit();
1512         qdio_setup_exit();
1513         qdio_debug_exit();
1514 }
1515
1516 module_init(init_QDIO);
1517 module_exit(exit_QDIO);