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, int merge_pending)
 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         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 221                 __state = SLSB_P_OUTPUT_EMPTY;
 222
 223         for (; i < count; i++) {
 224                 bufnr = next_buf(bufnr);
 225
 226                 /* merge PENDING into EMPTY: */
 227                 if (merge_pending &&
 228                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 229                     __state == SLSB_P_OUTPUT_EMPTY)
 230                         continue;
 231
 232                 /* stop if next state differs from initial state: */
 233                 if (q->slsb.val[bufnr] != __state)
 234                         break;
 235         }
 236
 237 out:
 238         *state = __state;
 239         return i;
 240 }
 241
 242 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 243                                 unsigned char *state, int auto_ack)
 244 {
 245         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 246 }
 247
 248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 249 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 250                                  unsigned char state, int count)
 251 {
 252         int i;
 253
 254         if (is_qebsm(q))
 255                 return qdio_do_sqbs(q, state, bufnr, count);
 256
 257         for (i = 0; i < count; i++) {
 258                 xchg(&q->slsb.val[bufnr], state);
 259                 bufnr = next_buf(bufnr);
 260         }
 261         return count;
 262 }
 263
 264 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 265                                 unsigned char state)
 266 {
 267         return set_buf_states(q, bufnr, state, 1);
 268 }
 269
 270 /* set slsb states to initial state */
 271 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 272 {
 273         struct qdio_q *q;
 274         int i;
 275
 276         for_each_input_queue(irq_ptr, q, i)
 277                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 278                                QDIO_MAX_BUFFERS_PER_Q);
 279         for_each_output_queue(irq_ptr, q, i)
 280                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 281                                QDIO_MAX_BUFFERS_PER_Q);
 282 }
 283
 284 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 285                           unsigned int input)
 286 {
 287         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 288         unsigned int fc = QDIO_SIGA_SYNC;
 289         int cc;
 290
 291         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 292         qperf_inc(q, siga_sync);
 293
 294         if (is_qebsm(q)) {
 295                 schid = q->irq_ptr->sch_token;
 296                 fc |= QDIO_SIGA_QEBSM_FLAG;
 297         }
 298
 299         cc = do_siga_sync(schid, output, input, fc);
 300         if (unlikely(cc))
 301                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 302         return (cc) ? -EIO : 0;
 303 }
 304
 305 static inline int qdio_siga_sync_q(struct qdio_q *q)
 306 {
 307         if (q->is_input_q)
 308                 return qdio_siga_sync(q, 0, q->mask);
 309         else
 310                 return qdio_siga_sync(q, q->mask, 0);
 311 }
 312
 313 static int qdio_siga_output(struct qdio_q *q, unsigned int count,
 314                             unsigned int *busy_bit, unsigned long aob)
 315 {
 316         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 317         unsigned int fc = QDIO_SIGA_WRITE;
 318         u64 start_time = 0;
 319         int retries = 0, cc;
 320
 321         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
 322                 if (count > 1)
 323                         fc = QDIO_SIGA_WRITEM;
 324                 else if (aob)
 325                         fc = QDIO_SIGA_WRITEQ;
 326         }
 327
 328         if (is_qebsm(q)) {
 329                 schid = q->irq_ptr->sch_token;
 330                 fc |= QDIO_SIGA_QEBSM_FLAG;
 331         }
 332 again:
 333         cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
 334
 335         /* hipersocket busy condition */
 336         if (unlikely(*busy_bit)) {
 337                 retries++;
 338
 339                 if (!start_time) {
 340                         start_time = get_tod_clock_fast();
 341                         goto again;
 342                 }
 343                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 344                         goto again;
 345         }
 346         if (retries) {
 347                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 348                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 349                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 350         }
 351         return cc;
 352 }
 353
 354 static inline int qdio_siga_input(struct qdio_q *q)
 355 {
 356         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 357         unsigned int fc = QDIO_SIGA_READ;
 358         int cc;
 359
 360         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 361         qperf_inc(q, siga_read);
 362
 363         if (is_qebsm(q)) {
 364                 schid = q->irq_ptr->sch_token;
 365                 fc |= QDIO_SIGA_QEBSM_FLAG;
 366         }
 367
 368         cc = do_siga_input(schid, q->mask, fc);
 369         if (unlikely(cc))
 370                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 371         return (cc) ? -EIO : 0;
 372 }
 373
 374 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 375 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 376
 377 static inline void qdio_sync_queues(struct qdio_q *q)
 378 {
 379         /* PCI capable outbound queues will also be scanned so sync them too */
 380         if (pci_out_supported(q->irq_ptr))
 381                 qdio_siga_sync_all(q);
 382         else
 383                 qdio_siga_sync_q(q);
 384 }
 385
 386 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 387                         unsigned char *state)
 388 {
 389         if (need_siga_sync(q))
 390                 qdio_siga_sync_q(q);
 391         return get_buf_state(q, bufnr, state, 0);
 392 }
 393
 394 static inline void qdio_stop_polling(struct qdio_q *q)
 395 {
 396         if (!q->u.in.ack_count)
 397                 return;
 398
 399         qperf_inc(q, stop_polling);
 400
 401         /* show the card that we are not polling anymore */
 402         set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 403                        q->u.in.ack_count);
 404         q->u.in.ack_count = 0;
 405 }
 406
 407 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 408 {
 409         int pos;
 410
 411         q->q_stats.nr_sbal_total += count;
 412         if (count == QDIO_MAX_BUFFERS_MASK) {
 413                 q->q_stats.nr_sbals[7]++;
 414                 return;
 415         }
 416         pos = ilog2(count);
 417         q->q_stats.nr_sbals[pos]++;
 418 }
 419
 420 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 421                                  int count)
 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[start]->element[15].sflags == 0x10) {
 428                 qperf_inc(q, target_full);
 429                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 430                 return;
 431         }
 432
 433         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 434         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 435         DBF_ERROR("FTC:%3d C:%3d", start, count);
 436         DBF_ERROR("F14:%2x F15:%2x",
 437                   q->sbal[start]->element[14].sflags,
 438                   q->sbal[start]->element[15].sflags);
 439 }
 440
 441 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
 442                                        int count, bool auto_ack)
 443 {
 444         int new;
 445
 446         if (auto_ack) {
 447                 if (!q->u.in.ack_count) {
 448                         q->u.in.ack_count = count;
 449                         q->u.in.ack_start = start;
 450                         return;
 451                 }
 452
 453                 /* delete the previous ACK's */
 454                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 455                                q->u.in.ack_count);
 456                 q->u.in.ack_count = count;
 457                 q->u.in.ack_start = start;
 458                 return;
 459         }
 460
 461         /*
 462          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 463          * or by the next inbound run.
 464          */
 465         new = add_buf(start, count - 1);
 466         set_buf_state(q, new, SLSB_P_INPUT_ACK);
 467
 468         /* delete the previous ACKs */
 469         if (q->u.in.ack_count)
 470                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 471                                q->u.in.ack_count);
 472
 473         q->u.in.ack_count = 1;
 474         q->u.in.ack_start = new;
 475         count--;
 476         if (!count)
 477                 return;
 478         /* need to change ALL buffers to get more interrupts */
 479         set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
 480 }
 481
 482 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 483 {
 484         unsigned char state = 0;
 485         int count;
 486
 487         q->timestamp = get_tod_clock_fast();
 488
 489         /*
 490          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 491          * would return 0.
 492          */
 493         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 494         if (!count)
 495                 return 0;
 496
 497         /*
 498          * No siga sync here, as a PCI or we after a thin interrupt
 499          * already sync'ed the queues.
 500          */
 501         count = get_buf_states(q, start, &state, count, 1, 0);
 502         if (!count)
 503                 return 0;
 504
 505         switch (state) {
 506         case SLSB_P_INPUT_PRIMED:
 507                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
 508                               count);
 509
 510                 inbound_handle_work(q, start, count, is_qebsm(q));
 511                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 512                         qperf_inc(q, inbound_queue_full);
 513                 if (q->irq_ptr->perf_stat_enabled)
 514                         account_sbals(q, count);
 515                 return count;
 516         case SLSB_P_INPUT_ERROR:
 517                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
 518                               count);
 519
 520                 process_buffer_error(q, start, count);
 521                 inbound_handle_work(q, start, count, false);
 522                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 523                         qperf_inc(q, inbound_queue_full);
 524                 if (q->irq_ptr->perf_stat_enabled)
 525                         account_sbals_error(q, count);
 526                 return count;
 527         case SLSB_CU_INPUT_EMPTY:
 528         case SLSB_P_INPUT_NOT_INIT:
 529         case SLSB_P_INPUT_ACK:
 530                 if (q->irq_ptr->perf_stat_enabled)
 531                         q->q_stats.nr_sbal_nop++;
 532                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 533                               q->nr, start);
 534                 return 0;
 535         default:
 536                 WARN_ON_ONCE(1);
 537                 return 0;
 538         }
 539 }
 540
 541 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 542 {
 543         int count;
 544
 545         count = get_inbound_buffer_frontier(q, start);
 546
 547         if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 548                 q->u.in.timestamp = get_tod_clock();
 549
 550         return count;
 551 }
 552
 553 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 554 {
 555         unsigned char state = 0;
 556
 557         if (!atomic_read(&q->nr_buf_used))
 558                 return 1;
 559
 560         if (need_siga_sync(q))
 561                 qdio_siga_sync_q(q);
 562         get_buf_state(q, start, &state, 0);
 563
 564         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 565                 /* more work coming */
 566                 return 0;
 567
 568         if (is_thinint_irq(q->irq_ptr))
 569                 return 1;
 570
 571         /* don't poll under z/VM */
 572         if (MACHINE_IS_VM)
 573                 return 1;
 574
 575         /*
 576          * At this point we know, that inbound first_to_check
 577          * has (probably) not moved (see qdio_inbound_processing).
 578          */
 579         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 580                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start);
 581                 return 1;
 582         } else
 583                 return 0;
 584 }
 585
 586 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 587 {
 588         unsigned char state = 0;
 589         int j, b = start;
 590
 591         for (j = 0; j < count; ++j) {
 592                 get_buf_state(q, b, &state, 0);
 593                 if (state == SLSB_P_OUTPUT_PENDING) {
 594                         struct qaob *aob = q->u.out.aobs[b];
 595                         if (aob == NULL)
 596                                 continue;
 597
 598                         q->u.out.sbal_state[b].flags |=
 599                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 600                         q->u.out.aobs[b] = NULL;
 601                 }
 602                 b = next_buf(b);
 603         }
 604 }
 605
 606 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 607                                         int bufnr)
 608 {
 609         unsigned long phys_aob = 0;
 610
 611         if (!q->aobs[bufnr]) {
 612                 struct qaob *aob = qdio_allocate_aob();
 613                 q->aobs[bufnr] = aob;
 614         }
 615         if (q->aobs[bufnr]) {
 616                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 617                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 618                 WARN_ON_ONCE(phys_aob & 0xFF);
 619         }
 620
 621         q->sbal_state[bufnr].flags = 0;
 622         return phys_aob;
 623 }
 624
 625 static void qdio_kick_handler(struct qdio_q *q, unsigned int start,
 626                               unsigned int count)
 627 {
 628         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 629                 return;
 630
 631         if (q->is_input_q) {
 632                 qperf_inc(q, inbound_handler);
 633                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 634         } else {
 635                 qperf_inc(q, outbound_handler);
 636                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 637                               start, count);
 638         }
 639
 640         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 641                    q->irq_ptr->int_parm);
 642
 643         /* for the next time */
 644         q->qdio_error = 0;
 645 }
 646
 647 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 648 {
 649         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 650                 tasklet_schedule(&q->tasklet);
 651                 return 0;
 652         }
 653         return -EPERM;
 654 }
 655
 656 static void __qdio_inbound_processing(struct qdio_q *q)
 657 {
 658         unsigned int start = q->first_to_check;
 659         int count;
 660
 661         qperf_inc(q, tasklet_inbound);
 662
 663         count = qdio_inbound_q_moved(q, start);
 664         if (count == 0)
 665                 return;
 666
 667         qdio_kick_handler(q, start, count);
 668         start = add_buf(start, count);
 669         q->first_to_check = start;
 670
 671         if (!qdio_inbound_q_done(q, start)) {
 672                 /* means poll time is not yet over */
 673                 qperf_inc(q, tasklet_inbound_resched);
 674                 if (!qdio_tasklet_schedule(q))
 675                         return;
 676         }
 677
 678         qdio_stop_polling(q);
 679         /*
 680          * We need to check again to not lose initiative after
 681          * resetting the ACK state.
 682          */
 683         if (!qdio_inbound_q_done(q, start)) {
 684                 qperf_inc(q, tasklet_inbound_resched2);
 685                 qdio_tasklet_schedule(q);
 686         }
 687 }
 688
 689 void qdio_inbound_processing(unsigned long data)
 690 {
 691         struct qdio_q *q = (struct qdio_q *)data;
 692         __qdio_inbound_processing(q);
 693 }
 694
 695 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 696 {
 697         unsigned char state = 0;
 698         int count;
 699
 700         q->timestamp = get_tod_clock_fast();
 701
 702         if (need_siga_sync(q))
 703                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 704                     !pci_out_supported(q->irq_ptr)) ||
 705                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 706                     multicast_outbound(q)))
 707                         qdio_siga_sync_q(q);
 708
 709         count = atomic_read(&q->nr_buf_used);
 710         if (!count)
 711                 return 0;
 712
 713         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 714         if (!count)
 715                 return 0;
 716
 717         switch (state) {
 718         case SLSB_P_OUTPUT_EMPTY:
 719         case SLSB_P_OUTPUT_PENDING:
 720                 /* the adapter got it */
 721                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 722                         "out empty:%1d %02x", q->nr, count);
 723
 724                 atomic_sub(count, &q->nr_buf_used);
 725                 if (q->irq_ptr->perf_stat_enabled)
 726                         account_sbals(q, count);
 727                 return count;
 728         case SLSB_P_OUTPUT_ERROR:
 729                 process_buffer_error(q, start, count);
 730                 atomic_sub(count, &q->nr_buf_used);
 731                 if (q->irq_ptr->perf_stat_enabled)
 732                         account_sbals_error(q, count);
 733                 return count;
 734         case SLSB_CU_OUTPUT_PRIMED:
 735                 /* the adapter has not fetched the output yet */
 736                 if (q->irq_ptr->perf_stat_enabled)
 737                         q->q_stats.nr_sbal_nop++;
 738                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 739                               q->nr);
 740                 return 0;
 741         case SLSB_P_OUTPUT_NOT_INIT:
 742         case SLSB_P_OUTPUT_HALTED:
 743                 return 0;
 744         default:
 745                 WARN_ON_ONCE(1);
 746                 return 0;
 747         }
 748 }
 749
 750 /* all buffers processed? */
 751 static inline int qdio_outbound_q_done(struct qdio_q *q)
 752 {
 753         return atomic_read(&q->nr_buf_used) == 0;
 754 }
 755
 756 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 757 {
 758         int count;
 759
 760         count = get_outbound_buffer_frontier(q, start);
 761
 762         if (count) {
 763                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 764                 if (q->u.out.use_cq)
 765                         qdio_handle_aobs(q, start, count);
 766         }
 767
 768         return count;
 769 }
 770
 771 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 772                                 unsigned long aob)
 773 {
 774         int retries = 0, cc;
 775         unsigned int busy_bit;
 776
 777         if (!need_siga_out(q))
 778                 return 0;
 779
 780         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 781 retry:
 782         qperf_inc(q, siga_write);
 783
 784         cc = qdio_siga_output(q, count, &busy_bit, aob);
 785         switch (cc) {
 786         case 0:
 787                 break;
 788         case 2:
 789                 if (busy_bit) {
 790                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 791                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 792                                 goto retry;
 793                         }
 794                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 795                         cc = -EBUSY;
 796                 } else {
 797                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 798                         cc = -ENOBUFS;
 799                 }
 800                 break;
 801         case 1:
 802         case 3:
 803                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 804                 cc = -EIO;
 805                 break;
 806         }
 807         if (retries) {
 808                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 809                 DBF_ERROR("count:%u", retries);
 810         }
 811         return cc;
 812 }
 813
 814 static void __qdio_outbound_processing(struct qdio_q *q)
 815 {
 816         unsigned int start = q->first_to_check;
 817         int count;
 818
 819         qperf_inc(q, tasklet_outbound);
 820         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 821
 822         count = qdio_outbound_q_moved(q, start);
 823         if (count) {
 824                 q->first_to_check = add_buf(start, count);
 825                 qdio_kick_handler(q, start, count);
 826         }
 827
 828         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 829             !qdio_outbound_q_done(q))
 830                 goto sched;
 831
 832         if (q->u.out.pci_out_enabled)
 833                 return;
 834
 835         /*
 836          * Now we know that queue type is either qeth without pci enabled
 837          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 838          * is noticed and outbound_handler is called after some time.
 839          */
 840         if (qdio_outbound_q_done(q))
 841                 del_timer_sync(&q->u.out.timer);
 842         else
 843                 if (!timer_pending(&q->u.out.timer) &&
 844                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 845                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 846         return;
 847
 848 sched:
 849         qdio_tasklet_schedule(q);
 850 }
 851
 852 /* outbound tasklet */
 853 void qdio_outbound_processing(unsigned long data)
 854 {
 855         struct qdio_q *q = (struct qdio_q *)data;
 856         __qdio_outbound_processing(q);
 857 }
 858
 859 void qdio_outbound_timer(struct timer_list *t)
 860 {
 861         struct qdio_q *q = from_timer(q, t, u.out.timer);
 862
 863         qdio_tasklet_schedule(q);
 864 }
 865
 866 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 867 {
 868         struct qdio_q *out;
 869         int i;
 870
 871         if (!pci_out_supported(irq) || !irq->scan_threshold)
 872                 return;
 873
 874         for_each_output_queue(irq, out, i)
 875                 if (!qdio_outbound_q_done(out))
 876                         qdio_tasklet_schedule(out);
 877 }
 878
 879 void tiqdio_inbound_processing(unsigned long data)
 880 {
 881         struct qdio_q *q = (struct qdio_q *)data;
 882
 883         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 884                 qdio_sync_queues(q);
 885
 886         /* The interrupt could be caused by a PCI request: */
 887         qdio_check_outbound_pci_queues(q->irq_ptr);
 888
 889         __qdio_inbound_processing(q);
 890 }
 891
 892 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 893                                   enum qdio_irq_states state)
 894 {
 895         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 896
 897         irq_ptr->state = state;
 898         mb();
 899 }
 900
 901 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 902 {
 903         if (irb->esw.esw0.erw.cons) {
 904                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 905                 DBF_ERROR_HEX(irb, 64);
 906                 DBF_ERROR_HEX(irb->ecw, 64);
 907         }
 908 }
 909
 910 /* PCI interrupt handler */
 911 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 912 {
 913         int i;
 914         struct qdio_q *q;
 915
 916         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 917                 return;
 918
 919         if (irq_ptr->irq_poll) {
 920                 if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
 921                         irq_ptr->irq_poll(irq_ptr->cdev, irq_ptr->int_parm);
 922                 else
 923                         QDIO_PERF_STAT_INC(irq_ptr, int_discarded);
 924         } else {
 925                 for_each_input_queue(irq_ptr, q, i)
 926                         tasklet_schedule(&q->tasklet);
 927         }
 928
 929         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 930                 return;
 931
 932         for_each_output_queue(irq_ptr, q, i) {
 933                 if (qdio_outbound_q_done(q))
 934                         continue;
 935                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 936                         qdio_siga_sync_q(q);
 937                 qdio_tasklet_schedule(q);
 938         }
 939 }
 940
 941 static void qdio_handle_activate_check(struct ccw_device *cdev,
 942                                 unsigned long intparm, int cstat, int dstat)
 943 {
 944         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 945         struct qdio_q *q;
 946
 947         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 948         DBF_ERROR("intp :%lx", intparm);
 949         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 950
 951         if (irq_ptr->nr_input_qs) {
 952                 q = irq_ptr->input_qs[0];
 953         } else if (irq_ptr->nr_output_qs) {
 954                 q = irq_ptr->output_qs[0];
 955         } else {
 956                 dump_stack();
 957                 goto no_handler;
 958         }
 959
 960         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
 961                    q->nr, q->first_to_check, 0, irq_ptr->int_parm);
 962 no_handler:
 963         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 964         /*
 965          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 966          * Therefore we call the LGR detection function here.
 967          */
 968         lgr_info_log();
 969 }
 970
 971 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 972                                       int dstat)
 973 {
 974         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 975
 976         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 977
 978         if (cstat)
 979                 goto error;
 980         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 981                 goto error;
 982         if (!(dstat & DEV_STAT_DEV_END))
 983                 goto error;
 984         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 985         return;
 986
 987 error:
 988         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 989         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 990         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 991 }
 992
 993 /* qdio interrupt handler */
 994 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 995                       struct irb *irb)
 996 {
 997         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 998         struct subchannel_id schid;
 999         int cstat, dstat;
1000
1001         if (!intparm || !irq_ptr) {
1002                 ccw_device_get_schid(cdev, &schid);
1003                 DBF_ERROR("qint:%4x", schid.sch_no);
1004                 return;
1005         }
1006
1007         if (irq_ptr->perf_stat_enabled)
1008                 irq_ptr->perf_stat.qdio_int++;
1009
1010         if (IS_ERR(irb)) {
1011                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1012                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1013                 wake_up(&cdev->private->wait_q);
1014                 return;
1015         }
1016         qdio_irq_check_sense(irq_ptr, irb);
1017         cstat = irb->scsw.cmd.cstat;
1018         dstat = irb->scsw.cmd.dstat;
1019
1020         switch (irq_ptr->state) {
1021         case QDIO_IRQ_STATE_INACTIVE:
1022                 qdio_establish_handle_irq(cdev, cstat, dstat);
1023                 break;
1024         case QDIO_IRQ_STATE_CLEANUP:
1025                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1026                 break;
1027         case QDIO_IRQ_STATE_ESTABLISHED:
1028         case QDIO_IRQ_STATE_ACTIVE:
1029                 if (cstat & SCHN_STAT_PCI) {
1030                         qdio_int_handler_pci(irq_ptr);
1031                         return;
1032                 }
1033                 if (cstat || dstat)
1034                         qdio_handle_activate_check(cdev, intparm, cstat,
1035                                                    dstat);
1036                 break;
1037         case QDIO_IRQ_STATE_STOPPED:
1038                 break;
1039         default:
1040                 WARN_ON_ONCE(1);
1041         }
1042         wake_up(&cdev->private->wait_q);
1043 }
1044
1045 /**
1046  * qdio_get_ssqd_desc - get qdio subchannel description
1047  * @cdev: ccw device to get description for
1048  * @data: where to store the ssqd
1049  *
1050  * Returns 0 or an error code. The results of the chsc are stored in the
1051  * specified structure.
1052  */
1053 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1054                        struct qdio_ssqd_desc *data)
1055 {
1056         struct subchannel_id schid;
1057
1058         if (!cdev || !cdev->private)
1059                 return -EINVAL;
1060
1061         ccw_device_get_schid(cdev, &schid);
1062         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1063         return qdio_setup_get_ssqd(NULL, &schid, data);
1064 }
1065 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1066
1067 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
1068 {
1069         struct qdio_q *q;
1070         int i;
1071
1072         for_each_input_queue(irq_ptr, q, i)
1073                 tasklet_kill(&q->tasklet);
1074
1075         for_each_output_queue(irq_ptr, q, i) {
1076                 del_timer_sync(&q->u.out.timer);
1077                 tasklet_kill(&q->tasklet);
1078         }
1079 }
1080
1081 /**
1082  * qdio_shutdown - shut down a qdio subchannel
1083  * @cdev: associated ccw device
1084  * @how: use halt or clear to shutdown
1085  */
1086 int qdio_shutdown(struct ccw_device *cdev, int how)
1087 {
1088         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1089         struct subchannel_id schid;
1090         int rc;
1091
1092         if (!irq_ptr)
1093                 return -ENODEV;
1094
1095         WARN_ON_ONCE(irqs_disabled());
1096         ccw_device_get_schid(cdev, &schid);
1097         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1098
1099         mutex_lock(&irq_ptr->setup_mutex);
1100         /*
1101          * Subchannel was already shot down. We cannot prevent being called
1102          * twice since cio may trigger a shutdown asynchronously.
1103          */
1104         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1105                 mutex_unlock(&irq_ptr->setup_mutex);
1106                 return 0;
1107         }
1108
1109         /*
1110          * Indicate that the device is going down. Scheduling the queue
1111          * tasklets is forbidden from here on.
1112          */
1113         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1114
1115         tiqdio_remove_device(irq_ptr);
1116         qdio_shutdown_queues(irq_ptr);
1117         qdio_shutdown_debug_entries(irq_ptr);
1118
1119         /* cleanup subchannel */
1120         spin_lock_irq(get_ccwdev_lock(cdev));
1121         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1122         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1123                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1124         else
1125                 /* default behaviour is halt */
1126                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1127         spin_unlock_irq(get_ccwdev_lock(cdev));
1128         if (rc) {
1129                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1130                 DBF_ERROR("rc:%4d", rc);
1131                 goto no_cleanup;
1132         }
1133
1134         wait_event_interruptible_timeout(cdev->private->wait_q,
1135                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1136                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1137                 10 * HZ);
1138
1139 no_cleanup:
1140         qdio_shutdown_thinint(irq_ptr);
1141         qdio_shutdown_irq(irq_ptr);
1142
1143         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1144         mutex_unlock(&irq_ptr->setup_mutex);
1145         if (rc)
1146                 return rc;
1147         return 0;
1148 }
1149 EXPORT_SYMBOL_GPL(qdio_shutdown);
1150
1151 /**
1152  * qdio_free - free data structures for a qdio subchannel
1153  * @cdev: associated ccw device
1154  */
1155 int qdio_free(struct ccw_device *cdev)
1156 {
1157         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1158         struct subchannel_id schid;
1159
1160         if (!irq_ptr)
1161                 return -ENODEV;
1162
1163         ccw_device_get_schid(cdev, &schid);
1164         DBF_EVENT("qfree:%4x", schid.sch_no);
1165         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1166         mutex_lock(&irq_ptr->setup_mutex);
1167
1168         irq_ptr->debug_area = NULL;
1169         cdev->private->qdio_data = NULL;
1170         mutex_unlock(&irq_ptr->setup_mutex);
1171
1172         qdio_free_async_data(irq_ptr);
1173         qdio_free_queues(irq_ptr);
1174         free_page((unsigned long) irq_ptr->qdr);
1175         free_page(irq_ptr->chsc_page);
1176         free_page((unsigned long) irq_ptr);
1177         return 0;
1178 }
1179 EXPORT_SYMBOL_GPL(qdio_free);
1180
1181 /**
1182  * qdio_allocate - allocate qdio queues and associated data
1183  * @cdev: associated ccw device
1184  * @no_input_qs: allocate this number of Input Queues
1185  * @no_output_qs: allocate this number of Output Queues
1186  */
1187 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
1188                   unsigned int no_output_qs)
1189 {
1190         struct subchannel_id schid;
1191         struct qdio_irq *irq_ptr;
1192         int rc = -ENOMEM;
1193
1194         ccw_device_get_schid(cdev, &schid);
1195         DBF_EVENT("qallocate:%4x", schid.sch_no);
1196
1197         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
1198             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
1199                 return -EINVAL;
1200
1201         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1202         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1203         if (!irq_ptr)
1204                 return -ENOMEM;
1205
1206         irq_ptr->cdev = cdev;
1207         mutex_init(&irq_ptr->setup_mutex);
1208         if (qdio_allocate_dbf(irq_ptr))
1209                 goto err_dbf;
1210
1211         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
1212                       no_output_qs);
1213
1214         /*
1215          * Allocate a page for the chsc calls in qdio_establish.
1216          * Must be pre-allocated since a zfcp recovery will call
1217          * qdio_establish. In case of low memory and swap on a zfcp disk
1218          * we may not be able to allocate memory otherwise.
1219          */
1220         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1221         if (!irq_ptr->chsc_page)
1222                 goto err_chsc;
1223
1224         /* qdr is used in ccw1.cda which is u32 */
1225         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1226         if (!irq_ptr->qdr)
1227                 goto err_qdr;
1228
1229         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
1230         if (rc)
1231                 goto err_queues;
1232
1233         INIT_LIST_HEAD(&irq_ptr->entry);
1234         cdev->private->qdio_data = irq_ptr;
1235         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1236         return 0;
1237
1238 err_queues:
1239         free_page((unsigned long) irq_ptr->qdr);
1240 err_qdr:
1241         free_page(irq_ptr->chsc_page);
1242 err_chsc:
1243 err_dbf:
1244         free_page((unsigned long) irq_ptr);
1245         return rc;
1246 }
1247 EXPORT_SYMBOL_GPL(qdio_allocate);
1248
1249 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1250 {
1251         struct qdio_q *q = irq_ptr->input_qs[0];
1252         int i, use_cq = 0;
1253
1254         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1255                 use_cq = 1;
1256
1257         for_each_output_queue(irq_ptr, q, i) {
1258                 if (use_cq) {
1259                         if (multicast_outbound(q))
1260                                 continue;
1261                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1262                                 use_cq = 0;
1263                                 continue;
1264                         }
1265                 } else
1266                         qdio_disable_async_operation(&q->u.out);
1267         }
1268         DBF_EVENT("use_cq:%d", use_cq);
1269 }
1270
1271 static void qdio_trace_init_data(struct qdio_irq *irq,
1272                                  struct qdio_initialize *data)
1273 {
1274         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1275         DBF_DEV_HEX(irq, data->adapter_name, 8, DBF_ERR);
1276         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1277         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1278         DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR);
1279         DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR);
1280         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1281                       data->no_output_qs);
1282         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1283         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1284         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1285         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1286         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1287                     DBF_ERR);
1288 }
1289
1290 /**
1291  * qdio_establish - establish queues on a qdio subchannel
1292  * @cdev: associated ccw device
1293  * @init_data: initialization data
1294  */
1295 int qdio_establish(struct ccw_device *cdev,
1296                    struct qdio_initialize *init_data)
1297 {
1298         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1299         struct subchannel_id schid;
1300         int rc;
1301
1302         ccw_device_get_schid(cdev, &schid);
1303         DBF_EVENT("qestablish:%4x", schid.sch_no);
1304
1305         if (!irq_ptr)
1306                 return -ENODEV;
1307
1308         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1309             init_data->no_output_qs > irq_ptr->max_output_qs)
1310                 return -EINVAL;
1311
1312         if ((init_data->no_input_qs && !init_data->input_handler) ||
1313             (init_data->no_output_qs && !init_data->output_handler))
1314                 return -EINVAL;
1315
1316         if (!init_data->input_sbal_addr_array ||
1317             !init_data->output_sbal_addr_array)
1318                 return -EINVAL;
1319
1320         mutex_lock(&irq_ptr->setup_mutex);
1321         qdio_trace_init_data(irq_ptr, init_data);
1322         qdio_setup_irq(irq_ptr, init_data);
1323
1324         rc = qdio_establish_thinint(irq_ptr);
1325         if (rc) {
1326                 qdio_shutdown_irq(irq_ptr);
1327                 mutex_unlock(&irq_ptr->setup_mutex);
1328                 return rc;
1329         }
1330
1331         /* establish q */
1332         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1333         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1334         irq_ptr->ccw.count = irq_ptr->equeue.count;
1335         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1336
1337         spin_lock_irq(get_ccwdev_lock(cdev));
1338         ccw_device_set_options_mask(cdev, 0);
1339
1340         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1341         spin_unlock_irq(get_ccwdev_lock(cdev));
1342         if (rc) {
1343                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1344                 DBF_ERROR("rc:%4x", rc);
1345                 qdio_shutdown_thinint(irq_ptr);
1346                 qdio_shutdown_irq(irq_ptr);
1347                 mutex_unlock(&irq_ptr->setup_mutex);
1348                 return rc;
1349         }
1350
1351         wait_event_interruptible_timeout(cdev->private->wait_q,
1352                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1353                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1354
1355         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1356                 mutex_unlock(&irq_ptr->setup_mutex);
1357                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1358                 return -EIO;
1359         }
1360
1361         qdio_setup_ssqd_info(irq_ptr);
1362
1363         qdio_detect_hsicq(irq_ptr);
1364
1365         /* qebsm is now setup if available, initialize buffer states */
1366         qdio_init_buf_states(irq_ptr);
1367
1368         mutex_unlock(&irq_ptr->setup_mutex);
1369         qdio_print_subchannel_info(irq_ptr);
1370         qdio_setup_debug_entries(irq_ptr);
1371         return 0;
1372 }
1373 EXPORT_SYMBOL_GPL(qdio_establish);
1374
1375 /**
1376  * qdio_activate - activate queues on a qdio subchannel
1377  * @cdev: associated cdev
1378  */
1379 int qdio_activate(struct ccw_device *cdev)
1380 {
1381         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1382         struct subchannel_id schid;
1383         int rc;
1384
1385         ccw_device_get_schid(cdev, &schid);
1386         DBF_EVENT("qactivate:%4x", schid.sch_no);
1387
1388         if (!irq_ptr)
1389                 return -ENODEV;
1390
1391         mutex_lock(&irq_ptr->setup_mutex);
1392         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1393                 rc = -EBUSY;
1394                 goto out;
1395         }
1396
1397         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1398         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1399         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1400         irq_ptr->ccw.cda = 0;
1401
1402         spin_lock_irq(get_ccwdev_lock(cdev));
1403         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1404
1405         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1406                               0, DOIO_DENY_PREFETCH);
1407         spin_unlock_irq(get_ccwdev_lock(cdev));
1408         if (rc) {
1409                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1410                 DBF_ERROR("rc:%4x", rc);
1411                 goto out;
1412         }
1413
1414         if (is_thinint_irq(irq_ptr))
1415                 tiqdio_add_device(irq_ptr);
1416
1417         /* wait for subchannel to become active */
1418         msleep(5);
1419
1420         switch (irq_ptr->state) {
1421         case QDIO_IRQ_STATE_STOPPED:
1422         case QDIO_IRQ_STATE_ERR:
1423                 rc = -EIO;
1424                 break;
1425         default:
1426                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1427                 rc = 0;
1428         }
1429 out:
1430         mutex_unlock(&irq_ptr->setup_mutex);
1431         return rc;
1432 }
1433 EXPORT_SYMBOL_GPL(qdio_activate);
1434
1435 /**
1436  * handle_inbound - reset processed input buffers
1437  * @q: queue containing the buffers
1438  * @callflags: flags
1439  * @bufnr: first buffer to process
1440  * @count: how many buffers are emptied
1441  */
1442 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1443                           int bufnr, int count)
1444 {
1445         int overlap;
1446
1447         qperf_inc(q, inbound_call);
1448
1449         /* If any ACKed SBALs are returned to HW, adjust ACK tracking: */
1450         overlap = min(count - sub_buf(q->u.in.ack_start, bufnr),
1451                       q->u.in.ack_count);
1452         if (overlap > 0) {
1453                 q->u.in.ack_start = add_buf(q->u.in.ack_start, overlap);
1454                 q->u.in.ack_count -= overlap;
1455         }
1456
1457         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1458         atomic_add(count, &q->nr_buf_used);
1459
1460         if (need_siga_in(q))
1461                 return qdio_siga_input(q);
1462
1463         return 0;
1464 }
1465
1466 /**
1467  * handle_outbound - process filled outbound buffers
1468  * @q: queue containing the buffers
1469  * @callflags: flags
1470  * @bufnr: first buffer to process
1471  * @count: how many buffers are filled
1472  */
1473 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1474                            unsigned int bufnr, unsigned int count)
1475 {
1476         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1477         unsigned char state = 0;
1478         int used, rc = 0;
1479
1480         qperf_inc(q, outbound_call);
1481
1482         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1483         used = atomic_add_return(count, &q->nr_buf_used);
1484
1485         if (used == QDIO_MAX_BUFFERS_PER_Q)
1486                 qperf_inc(q, outbound_queue_full);
1487
1488         if (callflags & QDIO_FLAG_PCI_OUT) {
1489                 q->u.out.pci_out_enabled = 1;
1490                 qperf_inc(q, pci_request_int);
1491         } else
1492                 q->u.out.pci_out_enabled = 0;
1493
1494         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1495                 unsigned long phys_aob = 0;
1496
1497                 if (q->u.out.use_cq && count == 1)
1498                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1499
1500                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1501         } else if (need_siga_sync(q)) {
1502                 rc = qdio_siga_sync_q(q);
1503         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1504                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1505                    state == SLSB_CU_OUTPUT_PRIMED) {
1506                 /* The previous buffer is not processed yet, tack on. */
1507                 qperf_inc(q, fast_requeue);
1508         } else {
1509                 rc = qdio_kick_outbound_q(q, count, 0);
1510         }
1511
1512         /* Let drivers implement their own completion scanning: */
1513         if (!scan_threshold)
1514                 return rc;
1515
1516         /* in case of SIGA errors we must process the error immediately */
1517         if (used >= scan_threshold || rc)
1518                 qdio_tasklet_schedule(q);
1519         else
1520                 /* free the SBALs in case of no further traffic */
1521                 if (!timer_pending(&q->u.out.timer) &&
1522                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1523                         mod_timer(&q->u.out.timer, jiffies + HZ);
1524         return rc;
1525 }
1526
1527 /**
1528  * do_QDIO - process input or output buffers
1529  * @cdev: associated ccw_device for the qdio subchannel
1530  * @callflags: input or output and special flags from the program
1531  * @q_nr: queue number
1532  * @bufnr: buffer number
1533  * @count: how many buffers to process
1534  */
1535 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1536             int q_nr, unsigned int bufnr, unsigned int count)
1537 {
1538         struct qdio_irq *irq_ptr;
1539
1540         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1541                 return -EINVAL;
1542
1543         irq_ptr = cdev->private->qdio_data;
1544         if (!irq_ptr)
1545                 return -ENODEV;
1546
1547         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1548                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1549
1550         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1551                 return -EIO;
1552         if (!count)
1553                 return 0;
1554         if (callflags & QDIO_FLAG_SYNC_INPUT)
1555                 return handle_inbound(irq_ptr->input_qs[q_nr],
1556                                       callflags, bufnr, count);
1557         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1558                 return handle_outbound(irq_ptr->output_qs[q_nr],
1559                                        callflags, bufnr, count);
1560         return -EINVAL;
1561 }
1562 EXPORT_SYMBOL_GPL(do_QDIO);
1563
1564 /**
1565  * qdio_start_irq - enable interrupt processing for the device
1566  * @cdev: associated ccw_device for the qdio subchannel
1567  *
1568  * Return codes
1569  *   0 - success
1570  *   1 - irqs not started since new data is available
1571  */
1572 int qdio_start_irq(struct ccw_device *cdev)
1573 {
1574         struct qdio_q *q;
1575         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1576         unsigned int i;
1577
1578         if (!irq_ptr)
1579                 return -ENODEV;
1580
1581         for_each_input_queue(irq_ptr, q, i)
1582                 qdio_stop_polling(q);
1583
1584         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1585
1586         /*
1587          * We need to check again to not lose initiative after
1588          * resetting the ACK state.
1589          */
1590         if (test_nonshared_ind(irq_ptr))
1591                 goto rescan;
1592
1593         for_each_input_queue(irq_ptr, q, i) {
1594                 if (!qdio_inbound_q_done(q, q->first_to_check))
1595                         goto rescan;
1596         }
1597
1598         return 0;
1599
1600 rescan:
1601         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1602                 return 0;
1603         else
1604                 return 1;
1605
1606 }
1607 EXPORT_SYMBOL(qdio_start_irq);
1608
1609 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1610                                 unsigned int *error)
1611 {
1612         unsigned int start = q->first_to_check;
1613         int count;
1614
1615         count = q->is_input_q ? qdio_inbound_q_moved(q, start) :
1616                                 qdio_outbound_q_moved(q, start);
1617         if (count == 0)
1618                 return 0;
1619
1620         *bufnr = start;
1621         *error = q->qdio_error;
1622
1623         /* for the next time */
1624         q->first_to_check = add_buf(start, count);
1625         q->qdio_error = 0;
1626
1627         return count;
1628 }
1629
1630 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1631                        unsigned int *bufnr, unsigned int *error)
1632 {
1633         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1634         struct qdio_q *q;
1635
1636         if (!irq_ptr)
1637                 return -ENODEV;
1638         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1639
1640         if (need_siga_sync(q))
1641                 qdio_siga_sync_q(q);
1642
1643         return __qdio_inspect_queue(q, bufnr, error);
1644 }
1645 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1646
1647 /**
1648  * qdio_get_next_buffers - process input buffers
1649  * @cdev: associated ccw_device for the qdio subchannel
1650  * @nr: input queue number
1651  * @bufnr: first filled buffer number
1652  * @error: buffers are in error state
1653  *
1654  * Return codes
1655  *   < 0 - error
1656  *   = 0 - no new buffers found
1657  *   > 0 - number of processed buffers
1658  */
1659 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1660                           int *error)
1661 {
1662         struct qdio_q *q;
1663         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1664
1665         if (!irq_ptr)
1666                 return -ENODEV;
1667         q = irq_ptr->input_qs[nr];
1668
1669         /*
1670          * Cannot rely on automatic sync after interrupt since queues may
1671          * also be examined without interrupt.
1672          */
1673         if (need_siga_sync(q))
1674                 qdio_sync_queues(q);
1675
1676         qdio_check_outbound_pci_queues(irq_ptr);
1677
1678         /* Note: upper-layer MUST stop processing immediately here ... */
1679         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1680                 return -EIO;
1681
1682         return __qdio_inspect_queue(q, bufnr, error);
1683 }
1684 EXPORT_SYMBOL(qdio_get_next_buffers);
1685
1686 /**
1687  * qdio_stop_irq - disable interrupt processing for the device
1688  * @cdev: associated ccw_device for the qdio subchannel
1689  *
1690  * Return codes
1691  *   0 - interrupts were already disabled
1692  *   1 - interrupts successfully disabled
1693  */
1694 int qdio_stop_irq(struct ccw_device *cdev)
1695 {
1696         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1697
1698         if (!irq_ptr)
1699                 return -ENODEV;
1700
1701         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1702                 return 0;
1703         else
1704                 return 1;
1705 }
1706 EXPORT_SYMBOL(qdio_stop_irq);
1707
1708 static int __init init_QDIO(void)
1709 {
1710         int rc;
1711
1712         rc = qdio_debug_init();
1713         if (rc)
1714                 return rc;
1715         rc = qdio_setup_init();
1716         if (rc)
1717                 goto out_debug;
1718         rc = qdio_thinint_init();
1719         if (rc)
1720                 goto out_cache;
1721         return 0;
1722
1723 out_cache:
1724         qdio_setup_exit();
1725 out_debug:
1726         qdio_debug_exit();
1727         return rc;
1728 }
1729
1730 static void __exit exit_QDIO(void)
1731 {
1732         qdio_thinint_exit();
1733         qdio_setup_exit();
1734         qdio_debug_exit();
1735 }
1736
1737 module_init(init_QDIO);
1738 module_exit(exit_QDIO);