drivers/s390/cio/qdio_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   4  *
   5  * Copyright IBM Corp. 2000, 2008
   6  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   7  *            Jan Glauber <jang@linux.vnet.ibm.com>
   8  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/timer.h>
  14 #include <linux/delay.h>
  15 #include <linux/gfp.h>
  16 #include <linux/io.h>
  17 #include <linux/atomic.h>
  18 #include <asm/debug.h>
  19 #include <asm/qdio.h>
  20 #include <asm/ipl.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  * @aob: asynchronous operation block
  76  *
  77  * Returns condition code.
  78  * Note: For IQDC unicast queues only the highest priority queue is processed.
  79  */
  80 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  81                                  unsigned int *bb, unsigned int fc,
  82                                  unsigned long aob)
  83 {
  84         register unsigned long __fc asm("0") = fc;
  85         register unsigned long __schid asm("1") = schid;
  86         register unsigned long __mask asm("2") = mask;
  87         register unsigned long __aob asm("3") = aob;
  88         int cc;
  89
  90         asm volatile(
  91                 "       siga    0\n"
  92                 "       ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  95                 : "d" (__schid), "d" (__mask)
  96                 : "cc");
  97         *bb = __fc >> 31;
  98         return cc;
  99 }
 100
 101 /**
 102  * qdio_do_eqbs - extract buffer states for QEBSM
 103  * @q: queue to manipulate
 104  * @state: state of the extracted buffers
 105  * @start: buffer number to start at
 106  * @count: count of buffers to examine
 107  * @auto_ack: automatically acknowledge buffers
 108  *
 109  * Returns the number of successfully extracted equal buffer states.
 110  * Stops processing if a state is different from the last buffers state.
 111  */
 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 113                         int start, int count, int auto_ack)
 114 {
 115         int tmp_count = count, tmp_start = start, nr = q->nr;
 116         unsigned int ccq = 0;
 117
 118         qperf_inc(q, eqbs);
 119
 120         if (!q->is_input_q)
 121                 nr += q->irq_ptr->nr_input_qs;
 122 again:
 123         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 124                       auto_ack);
 125
 126         switch (ccq) {
 127         case 0:
 128         case 32:
 129                 /* all done, or next buffer state different */
 130                 return count - tmp_count;
 131         case 96:
 132                 /* not all buffers processed */
 133                 qperf_inc(q, eqbs_partial);
 134                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
 135                         tmp_count);
 136                 return count - tmp_count;
 137         case 97:
 138                 /* no buffer processed */
 139                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 140                 goto again;
 141         default:
 142                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 143                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 144                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 145                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
 146                            q->first_to_kick, count, q->irq_ptr->int_parm);
 147                 return 0;
 148         }
 149 }
 150
 151 /**
 152  * qdio_do_sqbs - set buffer states for QEBSM
 153  * @q: queue to manipulate
 154  * @state: new state of the buffers
 155  * @start: first buffer number to change
 156  * @count: how many buffers to change
 157  *
 158  * Returns the number of successfully changed buffers.
 159  * Does retrying until the specified count of buffer states is set or an
 160  * error occurs.
 161  */
 162 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 163                         int count)
 164 {
 165         unsigned int ccq = 0;
 166         int tmp_count = count, tmp_start = start;
 167         int nr = q->nr;
 168
 169         if (!count)
 170                 return 0;
 171         qperf_inc(q, sqbs);
 172
 173         if (!q->is_input_q)
 174                 nr += q->irq_ptr->nr_input_qs;
 175 again:
 176         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 177
 178         switch (ccq) {
 179         case 0:
 180         case 32:
 181                 /* all done, or active buffer adapter-owned */
 182                 WARN_ON_ONCE(tmp_count);
 183                 return count - tmp_count;
 184         case 96:
 185                 /* not all buffers processed */
 186                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 187                 qperf_inc(q, sqbs_partial);
 188                 goto again;
 189         default:
 190                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 191                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 192                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 193                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
 194                            q->first_to_kick, count, q->irq_ptr->int_parm);
 195                 return 0;
 196         }
 197 }
 198
 199 /*
 200  * Returns number of examined buffers and their common state in *state.
 201  * Requested number of buffers-to-examine must be > 0.
 202  */
 203 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 204                                  unsigned char *state, unsigned int count,
 205                                  int auto_ack, int merge_pending)
 206 {
 207         unsigned char __state = 0;
 208         int i;
 209
 210         if (is_qebsm(q))
 211                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 212
 213         /* get initial state: */
 214         __state = q->slsb.val[bufnr];
 215         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 216                 __state = SLSB_P_OUTPUT_EMPTY;
 217
 218         for (i = 1; i < count; i++) {
 219                 bufnr = next_buf(bufnr);
 220
 221                 /* merge PENDING into EMPTY: */
 222                 if (merge_pending &&
 223                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 224                     __state == SLSB_P_OUTPUT_EMPTY)
 225                         continue;
 226
 227                 /* stop if next state differs from initial state: */
 228                 if (q->slsb.val[bufnr] != __state)
 229                         break;
 230         }
 231         *state = __state;
 232         return i;
 233 }
 234
 235 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 236                                 unsigned char *state, int auto_ack)
 237 {
 238         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 239 }
 240
 241 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 242 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 243                                  unsigned char state, int count)
 244 {
 245         int i;
 246
 247         if (is_qebsm(q))
 248                 return qdio_do_sqbs(q, state, bufnr, count);
 249
 250         for (i = 0; i < count; i++) {
 251                 xchg(&q->slsb.val[bufnr], state);
 252                 bufnr = next_buf(bufnr);
 253         }
 254         return count;
 255 }
 256
 257 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 258                                 unsigned char state)
 259 {
 260         return set_buf_states(q, bufnr, state, 1);
 261 }
 262
 263 /* set slsb states to initial state */
 264 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 265 {
 266         struct qdio_q *q;
 267         int i;
 268
 269         for_each_input_queue(irq_ptr, q, i)
 270                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 271                                QDIO_MAX_BUFFERS_PER_Q);
 272         for_each_output_queue(irq_ptr, q, i)
 273                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 274                                QDIO_MAX_BUFFERS_PER_Q);
 275 }
 276
 277 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 278                           unsigned int input)
 279 {
 280         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 281         unsigned int fc = QDIO_SIGA_SYNC;
 282         int cc;
 283
 284         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 285         qperf_inc(q, siga_sync);
 286
 287         if (is_qebsm(q)) {
 288                 schid = q->irq_ptr->sch_token;
 289                 fc |= QDIO_SIGA_QEBSM_FLAG;
 290         }
 291
 292         cc = do_siga_sync(schid, output, input, fc);
 293         if (unlikely(cc))
 294                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 295         return (cc) ? -EIO : 0;
 296 }
 297
 298 static inline int qdio_siga_sync_q(struct qdio_q *q)
 299 {
 300         if (q->is_input_q)
 301                 return qdio_siga_sync(q, 0, q->mask);
 302         else
 303                 return qdio_siga_sync(q, q->mask, 0);
 304 }
 305
 306 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 307         unsigned long aob)
 308 {
 309         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 310         unsigned int fc = QDIO_SIGA_WRITE;
 311         u64 start_time = 0;
 312         int retries = 0, cc;
 313         unsigned long laob = 0;
 314
 315         WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
 316                              !q->u.out.use_cq));
 317         if (q->u.out.use_cq && aob != 0) {
 318                 fc = QDIO_SIGA_WRITEQ;
 319                 laob = aob;
 320         }
 321
 322         if (is_qebsm(q)) {
 323                 schid = q->irq_ptr->sch_token;
 324                 fc |= QDIO_SIGA_QEBSM_FLAG;
 325         }
 326 again:
 327         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 328
 329         /* hipersocket busy condition */
 330         if (unlikely(*busy_bit)) {
 331                 retries++;
 332
 333                 if (!start_time) {
 334                         start_time = get_tod_clock_fast();
 335                         goto again;
 336                 }
 337                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 338                         goto again;
 339         }
 340         if (retries) {
 341                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 342                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 343                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 351         unsigned int fc = QDIO_SIGA_READ;
 352         int cc;
 353
 354         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 355         qperf_inc(q, siga_read);
 356
 357         if (is_qebsm(q)) {
 358                 schid = q->irq_ptr->sch_token;
 359                 fc |= QDIO_SIGA_QEBSM_FLAG;
 360         }
 361
 362         cc = do_siga_input(schid, q->mask, fc);
 363         if (unlikely(cc))
 364                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 365         return (cc) ? -EIO : 0;
 366 }
 367
 368 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 369 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 370
 371 static inline void qdio_sync_queues(struct qdio_q *q)
 372 {
 373         /* PCI capable outbound queues will also be scanned so sync them too */
 374         if (pci_out_supported(q))
 375                 qdio_siga_sync_all(q);
 376         else
 377                 qdio_siga_sync_q(q);
 378 }
 379
 380 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 381                         unsigned char *state)
 382 {
 383         if (need_siga_sync(q))
 384                 qdio_siga_sync_q(q);
 385         return get_buf_states(q, bufnr, state, 1, 0, 0);
 386 }
 387
 388 static inline void qdio_stop_polling(struct qdio_q *q)
 389 {
 390         if (!q->u.in.polling)
 391                 return;
 392
 393         q->u.in.polling = 0;
 394         qperf_inc(q, stop_polling);
 395
 396         /* show the card that we are not polling anymore */
 397         if (is_qebsm(q)) {
 398                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 399                                q->u.in.ack_count);
 400                 q->u.in.ack_count = 0;
 401         } else
 402                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 403 }
 404
 405 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 406 {
 407         int pos;
 408
 409         q->q_stats.nr_sbal_total += count;
 410         if (count == QDIO_MAX_BUFFERS_MASK) {
 411                 q->q_stats.nr_sbals[7]++;
 412                 return;
 413         }
 414         pos = ilog2(count);
 415         q->q_stats.nr_sbals[pos]++;
 416 }
 417
 418 static void process_buffer_error(struct qdio_q *q, int count)
 419 {
 420         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 421                                         SLSB_P_OUTPUT_NOT_INIT;
 422
 423         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 424
 425         /* special handling for no target buffer empty */
 426         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 427             q->sbal[q->first_to_check]->element[15].sflags == 0x10) {
 428                 qperf_inc(q, target_full);
 429                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 430                               q->first_to_check);
 431                 goto set;
 432         }
 433
 434         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 435         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 436         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 437         DBF_ERROR("F14:%2x F15:%2x",
 438                   q->sbal[q->first_to_check]->element[14].sflags,
 439                   q->sbal[q->first_to_check]->element[15].sflags);
 440
 441 set:
 442         /*
 443          * Interrupts may be avoided as long as the error is present
 444          * so change the buffer state immediately to avoid starvation.
 445          */
 446         set_buf_states(q, q->first_to_check, state, count);
 447 }
 448
 449 static inline void inbound_primed(struct qdio_q *q, int count)
 450 {
 451         int new;
 452
 453         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
 454
 455         /* for QEBSM the ACK was already set by EQBS */
 456         if (is_qebsm(q)) {
 457                 if (!q->u.in.polling) {
 458                         q->u.in.polling = 1;
 459                         q->u.in.ack_count = count;
 460                         q->u.in.ack_start = q->first_to_check;
 461                         return;
 462                 }
 463
 464                 /* delete the previous ACK's */
 465                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 466                                q->u.in.ack_count);
 467                 q->u.in.ack_count = count;
 468                 q->u.in.ack_start = q->first_to_check;
 469                 return;
 470         }
 471
 472         /*
 473          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 474          * or by the next inbound run.
 475          */
 476         new = add_buf(q->first_to_check, count - 1);
 477         if (q->u.in.polling) {
 478                 /* reset the previous ACK but first set the new one */
 479                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 480                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 481         } else {
 482                 q->u.in.polling = 1;
 483                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 484         }
 485
 486         q->u.in.ack_start = new;
 487         count--;
 488         if (!count)
 489                 return;
 490         /* need to change ALL buffers to get more interrupts */
 491         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 492 }
 493
 494 static int get_inbound_buffer_frontier(struct qdio_q *q)
 495 {
 496         unsigned char state = 0;
 497         int count;
 498
 499         q->timestamp = get_tod_clock_fast();
 500
 501         /*
 502          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 503          * would return 0.
 504          */
 505         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 506         if (!count)
 507                 goto out;
 508
 509         /*
 510          * No siga sync here, as a PCI or we after a thin interrupt
 511          * already sync'ed the queues.
 512          */
 513         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 514         if (!count)
 515                 goto out;
 516
 517         switch (state) {
 518         case SLSB_P_INPUT_PRIMED:
 519                 inbound_primed(q, count);
 520                 q->first_to_check = add_buf(q->first_to_check, count);
 521                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 522                         qperf_inc(q, inbound_queue_full);
 523                 if (q->irq_ptr->perf_stat_enabled)
 524                         account_sbals(q, count);
 525                 break;
 526         case SLSB_P_INPUT_ERROR:
 527                 process_buffer_error(q, count);
 528                 q->first_to_check = add_buf(q->first_to_check, count);
 529                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 530                         qperf_inc(q, inbound_queue_full);
 531                 if (q->irq_ptr->perf_stat_enabled)
 532                         account_sbals_error(q, count);
 533                 break;
 534         case SLSB_CU_INPUT_EMPTY:
 535         case SLSB_P_INPUT_NOT_INIT:
 536         case SLSB_P_INPUT_ACK:
 537                 if (q->irq_ptr->perf_stat_enabled)
 538                         q->q_stats.nr_sbal_nop++;
 539                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 540                         q->nr, q->first_to_check);
 541                 break;
 542         default:
 543                 WARN_ON_ONCE(1);
 544         }
 545 out:
 546         return q->first_to_check;
 547 }
 548
 549 static int qdio_inbound_q_moved(struct qdio_q *q)
 550 {
 551         int bufnr;
 552
 553         bufnr = get_inbound_buffer_frontier(q);
 554
 555         if (bufnr != q->last_move) {
 556                 q->last_move = bufnr;
 557                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 558                         q->u.in.timestamp = get_tod_clock();
 559                 return 1;
 560         } else
 561                 return 0;
 562 }
 563
 564 static inline int qdio_inbound_q_done(struct qdio_q *q)
 565 {
 566         unsigned char state = 0;
 567
 568         if (!atomic_read(&q->nr_buf_used))
 569                 return 1;
 570
 571         if (need_siga_sync(q))
 572                 qdio_siga_sync_q(q);
 573         get_buf_state(q, q->first_to_check, &state, 0);
 574
 575         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 576                 /* more work coming */
 577                 return 0;
 578
 579         if (is_thinint_irq(q->irq_ptr))
 580                 return 1;
 581
 582         /* don't poll under z/VM */
 583         if (MACHINE_IS_VM)
 584                 return 1;
 585
 586         /*
 587          * At this point we know, that inbound first_to_check
 588          * has (probably) not moved (see qdio_inbound_processing).
 589          */
 590         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 591                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 592                               q->first_to_check);
 593                 return 1;
 594         } else
 595                 return 0;
 596 }
 597
 598 static inline int contains_aobs(struct qdio_q *q)
 599 {
 600         return !q->is_input_q && q->u.out.use_cq;
 601 }
 602
 603 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 604 {
 605         unsigned char state = 0;
 606         int j, b = start;
 607
 608         if (!contains_aobs(q))
 609                 return;
 610
 611         for (j = 0; j < count; ++j) {
 612                 get_buf_state(q, b, &state, 0);
 613                 if (state == SLSB_P_OUTPUT_PENDING) {
 614                         struct qaob *aob = q->u.out.aobs[b];
 615                         if (aob == NULL)
 616                                 continue;
 617
 618                         q->u.out.sbal_state[b].flags |=
 619                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 620                         q->u.out.aobs[b] = NULL;
 621                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 622                         q->u.out.sbal_state[b].aob = NULL;
 623                 }
 624                 b = next_buf(b);
 625         }
 626 }
 627
 628 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 629                                         int bufnr)
 630 {
 631         unsigned long phys_aob = 0;
 632
 633         if (!q->use_cq)
 634                 goto out;
 635
 636         if (!q->aobs[bufnr]) {
 637                 struct qaob *aob = qdio_allocate_aob();
 638                 q->aobs[bufnr] = aob;
 639         }
 640         if (q->aobs[bufnr]) {
 641                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
 642                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 643                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 644                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 645                 WARN_ON_ONCE(phys_aob & 0xFF);
 646         }
 647
 648 out:
 649         return phys_aob;
 650 }
 651
 652 static void qdio_kick_handler(struct qdio_q *q)
 653 {
 654         int start = q->first_to_kick;
 655         int end = q->first_to_check;
 656         int count;
 657
 658         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 659                 return;
 660
 661         count = sub_buf(end, start);
 662
 663         if (q->is_input_q) {
 664                 qperf_inc(q, inbound_handler);
 665                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 666         } else {
 667                 qperf_inc(q, outbound_handler);
 668                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 669                               start, count);
 670         }
 671
 672         qdio_handle_aobs(q, start, count);
 673
 674         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 675                    q->irq_ptr->int_parm);
 676
 677         /* for the next time */
 678         q->first_to_kick = end;
 679         q->qdio_error = 0;
 680 }
 681
 682 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 683 {
 684         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 685                 tasklet_schedule(&q->tasklet);
 686                 return 0;
 687         }
 688         return -EPERM;
 689 }
 690
 691 static void __qdio_inbound_processing(struct qdio_q *q)
 692 {
 693         qperf_inc(q, tasklet_inbound);
 694
 695         if (!qdio_inbound_q_moved(q))
 696                 return;
 697
 698         qdio_kick_handler(q);
 699
 700         if (!qdio_inbound_q_done(q)) {
 701                 /* means poll time is not yet over */
 702                 qperf_inc(q, tasklet_inbound_resched);
 703                 if (!qdio_tasklet_schedule(q))
 704                         return;
 705         }
 706
 707         qdio_stop_polling(q);
 708         /*
 709          * We need to check again to not lose initiative after
 710          * resetting the ACK state.
 711          */
 712         if (!qdio_inbound_q_done(q)) {
 713                 qperf_inc(q, tasklet_inbound_resched2);
 714                 qdio_tasklet_schedule(q);
 715         }
 716 }
 717
 718 void qdio_inbound_processing(unsigned long data)
 719 {
 720         struct qdio_q *q = (struct qdio_q *)data;
 721         __qdio_inbound_processing(q);
 722 }
 723
 724 static int get_outbound_buffer_frontier(struct qdio_q *q)
 725 {
 726         unsigned char state = 0;
 727         int count;
 728
 729         q->timestamp = get_tod_clock_fast();
 730
 731         if (need_siga_sync(q))
 732                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 733                     !pci_out_supported(q)) ||
 734                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 735                     multicast_outbound(q)))
 736                         qdio_siga_sync_q(q);
 737
 738         /*
 739          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 740          * would return 0.
 741          */
 742         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 743         if (!count)
 744                 goto out;
 745
 746         count = get_buf_states(q, q->first_to_check, &state, count, 0,
 747                                q->u.out.use_cq);
 748         if (!count)
 749                 goto out;
 750
 751         switch (state) {
 752         case SLSB_P_OUTPUT_EMPTY:
 753                 /* the adapter got it */
 754                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 755                         "out empty:%1d %02x", q->nr, count);
 756
 757                 atomic_sub(count, &q->nr_buf_used);
 758                 q->first_to_check = add_buf(q->first_to_check, count);
 759                 if (q->irq_ptr->perf_stat_enabled)
 760                         account_sbals(q, count);
 761
 762                 break;
 763         case SLSB_P_OUTPUT_ERROR:
 764                 process_buffer_error(q, count);
 765                 q->first_to_check = add_buf(q->first_to_check, count);
 766                 atomic_sub(count, &q->nr_buf_used);
 767                 if (q->irq_ptr->perf_stat_enabled)
 768                         account_sbals_error(q, count);
 769                 break;
 770         case SLSB_CU_OUTPUT_PRIMED:
 771                 /* the adapter has not fetched the output yet */
 772                 if (q->irq_ptr->perf_stat_enabled)
 773                         q->q_stats.nr_sbal_nop++;
 774                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 775                               q->nr);
 776                 break;
 777         case SLSB_P_OUTPUT_NOT_INIT:
 778         case SLSB_P_OUTPUT_HALTED:
 779                 break;
 780         default:
 781                 WARN_ON_ONCE(1);
 782         }
 783
 784 out:
 785         return q->first_to_check;
 786 }
 787
 788 /* all buffers processed? */
 789 static inline int qdio_outbound_q_done(struct qdio_q *q)
 790 {
 791         return atomic_read(&q->nr_buf_used) == 0;
 792 }
 793
 794 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 795 {
 796         int bufnr;
 797
 798         bufnr = get_outbound_buffer_frontier(q);
 799
 800         if (bufnr != q->last_move) {
 801                 q->last_move = bufnr;
 802                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 803                 return 1;
 804         } else
 805                 return 0;
 806 }
 807
 808 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 809 {
 810         int retries = 0, cc;
 811         unsigned int busy_bit;
 812
 813         if (!need_siga_out(q))
 814                 return 0;
 815
 816         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 817 retry:
 818         qperf_inc(q, siga_write);
 819
 820         cc = qdio_siga_output(q, &busy_bit, aob);
 821         switch (cc) {
 822         case 0:
 823                 break;
 824         case 2:
 825                 if (busy_bit) {
 826                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 827                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 828                                 goto retry;
 829                         }
 830                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 831                         cc = -EBUSY;
 832                 } else {
 833                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 834                         cc = -ENOBUFS;
 835                 }
 836                 break;
 837         case 1:
 838         case 3:
 839                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 840                 cc = -EIO;
 841                 break;
 842         }
 843         if (retries) {
 844                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 845                 DBF_ERROR("count:%u", retries);
 846         }
 847         return cc;
 848 }
 849
 850 static void __qdio_outbound_processing(struct qdio_q *q)
 851 {
 852         qperf_inc(q, tasklet_outbound);
 853         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 854
 855         if (qdio_outbound_q_moved(q))
 856                 qdio_kick_handler(q);
 857
 858         if (queue_type(q) == QDIO_ZFCP_QFMT)
 859                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 860                         goto sched;
 861
 862         if (q->u.out.pci_out_enabled)
 863                 return;
 864
 865         /*
 866          * Now we know that queue type is either qeth without pci enabled
 867          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 868          * is noticed and outbound_handler is called after some time.
 869          */
 870         if (qdio_outbound_q_done(q))
 871                 del_timer_sync(&q->u.out.timer);
 872         else
 873                 if (!timer_pending(&q->u.out.timer) &&
 874                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 875                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 876         return;
 877
 878 sched:
 879         qdio_tasklet_schedule(q);
 880 }
 881
 882 /* outbound tasklet */
 883 void qdio_outbound_processing(unsigned long data)
 884 {
 885         struct qdio_q *q = (struct qdio_q *)data;
 886         __qdio_outbound_processing(q);
 887 }
 888
 889 void qdio_outbound_timer(struct timer_list *t)
 890 {
 891         struct qdio_q *q = from_timer(q, t, u.out.timer);
 892
 893         qdio_tasklet_schedule(q);
 894 }
 895
 896 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 897 {
 898         struct qdio_q *out;
 899         int i;
 900
 901         if (!pci_out_supported(q))
 902                 return;
 903
 904         for_each_output_queue(q->irq_ptr, out, i)
 905                 if (!qdio_outbound_q_done(out))
 906                         qdio_tasklet_schedule(out);
 907 }
 908
 909 static void __tiqdio_inbound_processing(struct qdio_q *q)
 910 {
 911         qperf_inc(q, tasklet_inbound);
 912         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 913                 qdio_sync_queues(q);
 914
 915         /*
 916          * The interrupt could be caused by a PCI request. Check the
 917          * PCI capable outbound queues.
 918          */
 919         qdio_check_outbound_after_thinint(q);
 920
 921         if (!qdio_inbound_q_moved(q))
 922                 return;
 923
 924         qdio_kick_handler(q);
 925
 926         if (!qdio_inbound_q_done(q)) {
 927                 qperf_inc(q, tasklet_inbound_resched);
 928                 if (!qdio_tasklet_schedule(q))
 929                         return;
 930         }
 931
 932         qdio_stop_polling(q);
 933         /*
 934          * We need to check again to not lose initiative after
 935          * resetting the ACK state.
 936          */
 937         if (!qdio_inbound_q_done(q)) {
 938                 qperf_inc(q, tasklet_inbound_resched2);
 939                 qdio_tasklet_schedule(q);
 940         }
 941 }
 942
 943 void tiqdio_inbound_processing(unsigned long data)
 944 {
 945         struct qdio_q *q = (struct qdio_q *)data;
 946         __tiqdio_inbound_processing(q);
 947 }
 948
 949 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 950                                   enum qdio_irq_states state)
 951 {
 952         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 953
 954         irq_ptr->state = state;
 955         mb();
 956 }
 957
 958 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 959 {
 960         if (irb->esw.esw0.erw.cons) {
 961                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 962                 DBF_ERROR_HEX(irb, 64);
 963                 DBF_ERROR_HEX(irb->ecw, 64);
 964         }
 965 }
 966
 967 /* PCI interrupt handler */
 968 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 969 {
 970         int i;
 971         struct qdio_q *q;
 972
 973         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 974                 return;
 975
 976         for_each_input_queue(irq_ptr, q, i) {
 977                 if (q->u.in.queue_start_poll) {
 978                         /* skip if polling is enabled or already in work */
 979                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 980                                      &q->u.in.queue_irq_state)) {
 981                                 qperf_inc(q, int_discarded);
 982                                 continue;
 983                         }
 984                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 985                                                  q->irq_ptr->int_parm);
 986                 } else {
 987                         tasklet_schedule(&q->tasklet);
 988                 }
 989         }
 990
 991         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 992                 return;
 993
 994         for_each_output_queue(irq_ptr, q, i) {
 995                 if (qdio_outbound_q_done(q))
 996                         continue;
 997                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 998                         qdio_siga_sync_q(q);
 999                 qdio_tasklet_schedule(q);
1000         }
1001 }
1002
1003 static void qdio_handle_activate_check(struct ccw_device *cdev,
1004                                 unsigned long intparm, int cstat, int dstat)
1005 {
1006         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1007         struct qdio_q *q;
1008         int count;
1009
1010         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1011         DBF_ERROR("intp :%lx", intparm);
1012         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1013
1014         if (irq_ptr->nr_input_qs) {
1015                 q = irq_ptr->input_qs[0];
1016         } else if (irq_ptr->nr_output_qs) {
1017                 q = irq_ptr->output_qs[0];
1018         } else {
1019                 dump_stack();
1020                 goto no_handler;
1021         }
1022
1023         count = sub_buf(q->first_to_check, q->first_to_kick);
1024         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1025                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1026 no_handler:
1027         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1028         /*
1029          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1030          * Therefore we call the LGR detection function here.
1031          */
1032         lgr_info_log();
1033 }
1034
1035 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1036                                       int dstat)
1037 {
1038         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1039
1040         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1041
1042         if (cstat)
1043                 goto error;
1044         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1045                 goto error;
1046         if (!(dstat & DEV_STAT_DEV_END))
1047                 goto error;
1048         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1049         return;
1050
1051 error:
1052         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1053         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1054         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1055 }
1056
1057 /* qdio interrupt handler */
1058 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1059                       struct irb *irb)
1060 {
1061         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1062         struct subchannel_id schid;
1063         int cstat, dstat;
1064
1065         if (!intparm || !irq_ptr) {
1066                 ccw_device_get_schid(cdev, &schid);
1067                 DBF_ERROR("qint:%4x", schid.sch_no);
1068                 return;
1069         }
1070
1071         if (irq_ptr->perf_stat_enabled)
1072                 irq_ptr->perf_stat.qdio_int++;
1073
1074         if (IS_ERR(irb)) {
1075                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1076                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1077                 wake_up(&cdev->private->wait_q);
1078                 return;
1079         }
1080         qdio_irq_check_sense(irq_ptr, irb);
1081         cstat = irb->scsw.cmd.cstat;
1082         dstat = irb->scsw.cmd.dstat;
1083
1084         switch (irq_ptr->state) {
1085         case QDIO_IRQ_STATE_INACTIVE:
1086                 qdio_establish_handle_irq(cdev, cstat, dstat);
1087                 break;
1088         case QDIO_IRQ_STATE_CLEANUP:
1089                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1090                 break;
1091         case QDIO_IRQ_STATE_ESTABLISHED:
1092         case QDIO_IRQ_STATE_ACTIVE:
1093                 if (cstat & SCHN_STAT_PCI) {
1094                         qdio_int_handler_pci(irq_ptr);
1095                         return;
1096                 }
1097                 if (cstat || dstat)
1098                         qdio_handle_activate_check(cdev, intparm, cstat,
1099                                                    dstat);
1100                 break;
1101         case QDIO_IRQ_STATE_STOPPED:
1102                 break;
1103         default:
1104                 WARN_ON_ONCE(1);
1105         }
1106         wake_up(&cdev->private->wait_q);
1107 }
1108
1109 /**
1110  * qdio_get_ssqd_desc - get qdio subchannel description
1111  * @cdev: ccw device to get description for
1112  * @data: where to store the ssqd
1113  *
1114  * Returns 0 or an error code. The results of the chsc are stored in the
1115  * specified structure.
1116  */
1117 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1118                        struct qdio_ssqd_desc *data)
1119 {
1120         struct subchannel_id schid;
1121
1122         if (!cdev || !cdev->private)
1123                 return -EINVAL;
1124
1125         ccw_device_get_schid(cdev, &schid);
1126         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1127         return qdio_setup_get_ssqd(NULL, &schid, data);
1128 }
1129 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1130
1131 static void qdio_shutdown_queues(struct ccw_device *cdev)
1132 {
1133         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1134         struct qdio_q *q;
1135         int i;
1136
1137         for_each_input_queue(irq_ptr, q, i)
1138                 tasklet_kill(&q->tasklet);
1139
1140         for_each_output_queue(irq_ptr, q, i) {
1141                 del_timer_sync(&q->u.out.timer);
1142                 tasklet_kill(&q->tasklet);
1143         }
1144 }
1145
1146 /**
1147  * qdio_shutdown - shut down a qdio subchannel
1148  * @cdev: associated ccw device
1149  * @how: use halt or clear to shutdown
1150  */
1151 int qdio_shutdown(struct ccw_device *cdev, int how)
1152 {
1153         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1154         struct subchannel_id schid;
1155         int rc;
1156
1157         if (!irq_ptr)
1158                 return -ENODEV;
1159
1160         WARN_ON_ONCE(irqs_disabled());
1161         ccw_device_get_schid(cdev, &schid);
1162         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1163
1164         mutex_lock(&irq_ptr->setup_mutex);
1165         /*
1166          * Subchannel was already shot down. We cannot prevent being called
1167          * twice since cio may trigger a shutdown asynchronously.
1168          */
1169         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1170                 mutex_unlock(&irq_ptr->setup_mutex);
1171                 return 0;
1172         }
1173
1174         /*
1175          * Indicate that the device is going down. Scheduling the queue
1176          * tasklets is forbidden from here on.
1177          */
1178         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1179
1180         tiqdio_remove_input_queues(irq_ptr);
1181         qdio_shutdown_queues(cdev);
1182         qdio_shutdown_debug_entries(irq_ptr);
1183
1184         /* cleanup subchannel */
1185         spin_lock_irq(get_ccwdev_lock(cdev));
1186
1187         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1188                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1189         else
1190                 /* default behaviour is halt */
1191                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1192         if (rc) {
1193                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1194                 DBF_ERROR("rc:%4d", rc);
1195                 goto no_cleanup;
1196         }
1197
1198         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1199         spin_unlock_irq(get_ccwdev_lock(cdev));
1200         wait_event_interruptible_timeout(cdev->private->wait_q,
1201                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1202                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1203                 10 * HZ);
1204         spin_lock_irq(get_ccwdev_lock(cdev));
1205
1206 no_cleanup:
1207         qdio_shutdown_thinint(irq_ptr);
1208
1209         /* restore interrupt handler */
1210         if ((void *)cdev->handler == (void *)qdio_int_handler) {
1211                 cdev->handler = irq_ptr->orig_handler;
1212                 cdev->private->intparm = 0;
1213         }
1214         spin_unlock_irq(get_ccwdev_lock(cdev));
1215
1216         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1217         mutex_unlock(&irq_ptr->setup_mutex);
1218         if (rc)
1219                 return rc;
1220         return 0;
1221 }
1222 EXPORT_SYMBOL_GPL(qdio_shutdown);
1223
1224 /**
1225  * qdio_free - free data structures for a qdio subchannel
1226  * @cdev: associated ccw device
1227  */
1228 int qdio_free(struct ccw_device *cdev)
1229 {
1230         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1231         struct subchannel_id schid;
1232
1233         if (!irq_ptr)
1234                 return -ENODEV;
1235
1236         ccw_device_get_schid(cdev, &schid);
1237         DBF_EVENT("qfree:%4x", schid.sch_no);
1238         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1239         mutex_lock(&irq_ptr->setup_mutex);
1240
1241         irq_ptr->debug_area = NULL;
1242         cdev->private->qdio_data = NULL;
1243         mutex_unlock(&irq_ptr->setup_mutex);
1244
1245         qdio_release_memory(irq_ptr);
1246         return 0;
1247 }
1248 EXPORT_SYMBOL_GPL(qdio_free);
1249
1250 /**
1251  * qdio_allocate - allocate qdio queues and associated data
1252  * @init_data: initialization data
1253  */
1254 int qdio_allocate(struct qdio_initialize *init_data)
1255 {
1256         struct subchannel_id schid;
1257         struct qdio_irq *irq_ptr;
1258
1259         ccw_device_get_schid(init_data->cdev, &schid);
1260         DBF_EVENT("qallocate:%4x", schid.sch_no);
1261
1262         if ((init_data->no_input_qs && !init_data->input_handler) ||
1263             (init_data->no_output_qs && !init_data->output_handler))
1264                 return -EINVAL;
1265
1266         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1267             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1268                 return -EINVAL;
1269
1270         if ((!init_data->input_sbal_addr_array) ||
1271             (!init_data->output_sbal_addr_array))
1272                 return -EINVAL;
1273
1274         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1275         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1276         if (!irq_ptr)
1277                 goto out_err;
1278
1279         mutex_init(&irq_ptr->setup_mutex);
1280         if (qdio_allocate_dbf(init_data, irq_ptr))
1281                 goto out_rel;
1282
1283         /*
1284          * Allocate a page for the chsc calls in qdio_establish.
1285          * Must be pre-allocated since a zfcp recovery will call
1286          * qdio_establish. In case of low memory and swap on a zfcp disk
1287          * we may not be able to allocate memory otherwise.
1288          */
1289         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1290         if (!irq_ptr->chsc_page)
1291                 goto out_rel;
1292
1293         /* qdr is used in ccw1.cda which is u32 */
1294         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1295         if (!irq_ptr->qdr)
1296                 goto out_rel;
1297
1298         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1299                              init_data->no_output_qs))
1300                 goto out_rel;
1301
1302         init_data->cdev->private->qdio_data = irq_ptr;
1303         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1304         return 0;
1305 out_rel:
1306         qdio_release_memory(irq_ptr);
1307 out_err:
1308         return -ENOMEM;
1309 }
1310 EXPORT_SYMBOL_GPL(qdio_allocate);
1311
1312 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1313 {
1314         struct qdio_q *q = irq_ptr->input_qs[0];
1315         int i, use_cq = 0;
1316
1317         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1318                 use_cq = 1;
1319
1320         for_each_output_queue(irq_ptr, q, i) {
1321                 if (use_cq) {
1322                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1323                                 use_cq = 0;
1324                                 continue;
1325                         }
1326                 } else
1327                         qdio_disable_async_operation(&q->u.out);
1328         }
1329         DBF_EVENT("use_cq:%d", use_cq);
1330 }
1331
1332 /**
1333  * qdio_establish - establish queues on a qdio subchannel
1334  * @init_data: initialization data
1335  */
1336 int qdio_establish(struct qdio_initialize *init_data)
1337 {
1338         struct ccw_device *cdev = init_data->cdev;
1339         struct subchannel_id schid;
1340         struct qdio_irq *irq_ptr;
1341         int rc;
1342
1343         ccw_device_get_schid(cdev, &schid);
1344         DBF_EVENT("qestablish:%4x", schid.sch_no);
1345
1346         irq_ptr = cdev->private->qdio_data;
1347         if (!irq_ptr)
1348                 return -ENODEV;
1349
1350         mutex_lock(&irq_ptr->setup_mutex);
1351         qdio_setup_irq(init_data);
1352
1353         rc = qdio_establish_thinint(irq_ptr);
1354         if (rc) {
1355                 mutex_unlock(&irq_ptr->setup_mutex);
1356                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1357                 return rc;
1358         }
1359
1360         /* establish q */
1361         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1362         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1363         irq_ptr->ccw.count = irq_ptr->equeue.count;
1364         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1365
1366         spin_lock_irq(get_ccwdev_lock(cdev));
1367         ccw_device_set_options_mask(cdev, 0);
1368
1369         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1370         spin_unlock_irq(get_ccwdev_lock(cdev));
1371         if (rc) {
1372                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1373                 DBF_ERROR("rc:%4x", rc);
1374                 mutex_unlock(&irq_ptr->setup_mutex);
1375                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1376                 return rc;
1377         }
1378
1379         wait_event_interruptible_timeout(cdev->private->wait_q,
1380                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1381                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1382
1383         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1384                 mutex_unlock(&irq_ptr->setup_mutex);
1385                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1386                 return -EIO;
1387         }
1388
1389         qdio_setup_ssqd_info(irq_ptr);
1390
1391         qdio_detect_hsicq(irq_ptr);
1392
1393         /* qebsm is now setup if available, initialize buffer states */
1394         qdio_init_buf_states(irq_ptr);
1395
1396         mutex_unlock(&irq_ptr->setup_mutex);
1397         qdio_print_subchannel_info(irq_ptr, cdev);
1398         qdio_setup_debug_entries(irq_ptr, cdev);
1399         return 0;
1400 }
1401 EXPORT_SYMBOL_GPL(qdio_establish);
1402
1403 /**
1404  * qdio_activate - activate queues on a qdio subchannel
1405  * @cdev: associated cdev
1406  */
1407 int qdio_activate(struct ccw_device *cdev)
1408 {
1409         struct subchannel_id schid;
1410         struct qdio_irq *irq_ptr;
1411         int rc;
1412
1413         ccw_device_get_schid(cdev, &schid);
1414         DBF_EVENT("qactivate:%4x", schid.sch_no);
1415
1416         irq_ptr = cdev->private->qdio_data;
1417         if (!irq_ptr)
1418                 return -ENODEV;
1419
1420         mutex_lock(&irq_ptr->setup_mutex);
1421         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1422                 rc = -EBUSY;
1423                 goto out;
1424         }
1425
1426         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1427         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1428         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1429         irq_ptr->ccw.cda = 0;
1430
1431         spin_lock_irq(get_ccwdev_lock(cdev));
1432         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1433
1434         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1435                               0, DOIO_DENY_PREFETCH);
1436         spin_unlock_irq(get_ccwdev_lock(cdev));
1437         if (rc) {
1438                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1439                 DBF_ERROR("rc:%4x", rc);
1440                 goto out;
1441         }
1442
1443         if (is_thinint_irq(irq_ptr))
1444                 tiqdio_add_input_queues(irq_ptr);
1445
1446         /* wait for subchannel to become active */
1447         msleep(5);
1448
1449         switch (irq_ptr->state) {
1450         case QDIO_IRQ_STATE_STOPPED:
1451         case QDIO_IRQ_STATE_ERR:
1452                 rc = -EIO;
1453                 break;
1454         default:
1455                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1456                 rc = 0;
1457         }
1458 out:
1459         mutex_unlock(&irq_ptr->setup_mutex);
1460         return rc;
1461 }
1462 EXPORT_SYMBOL_GPL(qdio_activate);
1463
1464 static inline int buf_in_between(int bufnr, int start, int count)
1465 {
1466         int end = add_buf(start, count);
1467
1468         if (end > start) {
1469                 if (bufnr >= start && bufnr < end)
1470                         return 1;
1471                 else
1472                         return 0;
1473         }
1474
1475         /* wrap-around case */
1476         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1477             (bufnr < end))
1478                 return 1;
1479         else
1480                 return 0;
1481 }
1482
1483 /**
1484  * handle_inbound - reset processed input buffers
1485  * @q: queue containing the buffers
1486  * @callflags: flags
1487  * @bufnr: first buffer to process
1488  * @count: how many buffers are emptied
1489  */
1490 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1491                           int bufnr, int count)
1492 {
1493         int diff;
1494
1495         qperf_inc(q, inbound_call);
1496
1497         if (!q->u.in.polling)
1498                 goto set;
1499
1500         /* protect against stop polling setting an ACK for an emptied slsb */
1501         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1502                 /* overwriting everything, just delete polling status */
1503                 q->u.in.polling = 0;
1504                 q->u.in.ack_count = 0;
1505                 goto set;
1506         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1507                 if (is_qebsm(q)) {
1508                         /* partial overwrite, just update ack_start */
1509                         diff = add_buf(bufnr, count);
1510                         diff = sub_buf(diff, q->u.in.ack_start);
1511                         q->u.in.ack_count -= diff;
1512                         if (q->u.in.ack_count <= 0) {
1513                                 q->u.in.polling = 0;
1514                                 q->u.in.ack_count = 0;
1515                                 goto set;
1516                         }
1517                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1518                 }
1519                 else
1520                         /* the only ACK will be deleted, so stop polling */
1521                         q->u.in.polling = 0;
1522         }
1523
1524 set:
1525         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1526         atomic_add(count, &q->nr_buf_used);
1527
1528         if (need_siga_in(q))
1529                 return qdio_siga_input(q);
1530
1531         return 0;
1532 }
1533
1534 /**
1535  * handle_outbound - process filled outbound buffers
1536  * @q: queue containing the buffers
1537  * @callflags: flags
1538  * @bufnr: first buffer to process
1539  * @count: how many buffers are filled
1540  */
1541 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1542                            int bufnr, int count)
1543 {
1544         unsigned char state = 0;
1545         int used, rc = 0;
1546
1547         qperf_inc(q, outbound_call);
1548
1549         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1550         used = atomic_add_return(count, &q->nr_buf_used);
1551
1552         if (used == QDIO_MAX_BUFFERS_PER_Q)
1553                 qperf_inc(q, outbound_queue_full);
1554
1555         if (callflags & QDIO_FLAG_PCI_OUT) {
1556                 q->u.out.pci_out_enabled = 1;
1557                 qperf_inc(q, pci_request_int);
1558         } else
1559                 q->u.out.pci_out_enabled = 0;
1560
1561         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1562                 unsigned long phys_aob = 0;
1563
1564                 /* One SIGA-W per buffer required for unicast HSI */
1565                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1566
1567                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1568
1569                 rc = qdio_kick_outbound_q(q, phys_aob);
1570         } else if (need_siga_sync(q)) {
1571                 rc = qdio_siga_sync_q(q);
1572         } else {
1573                 /* try to fast requeue buffers */
1574                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1575                 if (state != SLSB_CU_OUTPUT_PRIMED)
1576                         rc = qdio_kick_outbound_q(q, 0);
1577                 else
1578                         qperf_inc(q, fast_requeue);
1579         }
1580
1581         /* in case of SIGA errors we must process the error immediately */
1582         if (used >= q->u.out.scan_threshold || rc)
1583                 qdio_tasklet_schedule(q);
1584         else
1585                 /* free the SBALs in case of no further traffic */
1586                 if (!timer_pending(&q->u.out.timer) &&
1587                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1588                         mod_timer(&q->u.out.timer, jiffies + HZ);
1589         return rc;
1590 }
1591
1592 /**
1593  * do_QDIO - process input or output buffers
1594  * @cdev: associated ccw_device for the qdio subchannel
1595  * @callflags: input or output and special flags from the program
1596  * @q_nr: queue number
1597  * @bufnr: buffer number
1598  * @count: how many buffers to process
1599  */
1600 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1601             int q_nr, unsigned int bufnr, unsigned int count)
1602 {
1603         struct qdio_irq *irq_ptr;
1604
1605         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1606                 return -EINVAL;
1607
1608         irq_ptr = cdev->private->qdio_data;
1609         if (!irq_ptr)
1610                 return -ENODEV;
1611
1612         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1613                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1614
1615         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1616                 return -EIO;
1617         if (!count)
1618                 return 0;
1619         if (callflags & QDIO_FLAG_SYNC_INPUT)
1620                 return handle_inbound(irq_ptr->input_qs[q_nr],
1621                                       callflags, bufnr, count);
1622         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1623                 return handle_outbound(irq_ptr->output_qs[q_nr],
1624                                        callflags, bufnr, count);
1625         return -EINVAL;
1626 }
1627 EXPORT_SYMBOL_GPL(do_QDIO);
1628
1629 /**
1630  * qdio_start_irq - process input buffers
1631  * @cdev: associated ccw_device for the qdio subchannel
1632  * @nr: input queue number
1633  *
1634  * Return codes
1635  *   0 - success
1636  *   1 - irqs not started since new data is available
1637  */
1638 int qdio_start_irq(struct ccw_device *cdev, int nr)
1639 {
1640         struct qdio_q *q;
1641         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1642
1643         if (!irq_ptr)
1644                 return -ENODEV;
1645         q = irq_ptr->input_qs[nr];
1646
1647         clear_nonshared_ind(irq_ptr);
1648         qdio_stop_polling(q);
1649         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1650
1651         /*
1652          * We need to check again to not lose initiative after
1653          * resetting the ACK state.
1654          */
1655         if (test_nonshared_ind(irq_ptr))
1656                 goto rescan;
1657         if (!qdio_inbound_q_done(q))
1658                 goto rescan;
1659         return 0;
1660
1661 rescan:
1662         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1663                              &q->u.in.queue_irq_state))
1664                 return 0;
1665         else
1666                 return 1;
1667
1668 }
1669 EXPORT_SYMBOL(qdio_start_irq);
1670
1671 /**
1672  * qdio_get_next_buffers - process input buffers
1673  * @cdev: associated ccw_device for the qdio subchannel
1674  * @nr: input queue number
1675  * @bufnr: first filled buffer number
1676  * @error: buffers are in error state
1677  *
1678  * Return codes
1679  *   < 0 - error
1680  *   = 0 - no new buffers found
1681  *   > 0 - number of processed buffers
1682  */
1683 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1684                           int *error)
1685 {
1686         struct qdio_q *q;
1687         int start, end;
1688         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1689
1690         if (!irq_ptr)
1691                 return -ENODEV;
1692         q = irq_ptr->input_qs[nr];
1693
1694         /*
1695          * Cannot rely on automatic sync after interrupt since queues may
1696          * also be examined without interrupt.
1697          */
1698         if (need_siga_sync(q))
1699                 qdio_sync_queues(q);
1700
1701         /* check the PCI capable outbound queues. */
1702         qdio_check_outbound_after_thinint(q);
1703
1704         if (!qdio_inbound_q_moved(q))
1705                 return 0;
1706
1707         /* Note: upper-layer MUST stop processing immediately here ... */
1708         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1709                 return -EIO;
1710
1711         start = q->first_to_kick;
1712         end = q->first_to_check;
1713         *bufnr = start;
1714         *error = q->qdio_error;
1715
1716         /* for the next time */
1717         q->first_to_kick = end;
1718         q->qdio_error = 0;
1719         return sub_buf(end, start);
1720 }
1721 EXPORT_SYMBOL(qdio_get_next_buffers);
1722
1723 /**
1724  * qdio_stop_irq - disable interrupt processing for the device
1725  * @cdev: associated ccw_device for the qdio subchannel
1726  * @nr: input queue number
1727  *
1728  * Return codes
1729  *   0 - interrupts were already disabled
1730  *   1 - interrupts successfully disabled
1731  */
1732 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1733 {
1734         struct qdio_q *q;
1735         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1736
1737         if (!irq_ptr)
1738                 return -ENODEV;
1739         q = irq_ptr->input_qs[nr];
1740
1741         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1742                              &q->u.in.queue_irq_state))
1743                 return 0;
1744         else
1745                 return 1;
1746 }
1747 EXPORT_SYMBOL(qdio_stop_irq);
1748
1749 /**
1750  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1751  * @schid:              Subchannel ID.
1752  * @cnc:                Boolean Change-Notification Control
1753  * @response:           Response code will be stored at this address
1754  * @cb:                 Callback function will be executed for each element
1755  *                      of the address list
1756  * @priv:               Pointer to pass to the callback function.
1757  *
1758  * Performs "Store-network-bridging-information list" operation and calls
1759  * the callback function for every entry in the list. If "change-
1760  * notification-control" is set, further changes in the address list
1761  * will be reported via the IPA command.
1762  */
1763 int qdio_pnso_brinfo(struct subchannel_id schid,
1764                 int cnc, u16 *response,
1765                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1766                                 void *entry),
1767                 void *priv)
1768 {
1769         struct chsc_pnso_area *rr;
1770         int rc;
1771         u32 prev_instance = 0;
1772         int isfirstblock = 1;
1773         int i, size, elems;
1774
1775         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1776         if (rr == NULL)
1777                 return -ENOMEM;
1778         do {
1779                 /* on the first iteration, naihdr.resume_token will be zero */
1780                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1781                 if (rc != 0 && rc != -EBUSY)
1782                         goto out;
1783                 if (rr->response.code != 1) {
1784                         rc = -EIO;
1785                         continue;
1786                 } else
1787                         rc = 0;
1788
1789                 if (cb == NULL)
1790                         continue;
1791
1792                 size = rr->naihdr.naids;
1793                 elems = (rr->response.length -
1794                                 sizeof(struct chsc_header) -
1795                                 sizeof(struct chsc_brinfo_naihdr)) /
1796                                 size;
1797
1798                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1799                         /* Inform the caller that they need to scrap */
1800                         /* the data that was already reported via cb */
1801                                 rc = -EAGAIN;
1802                                 break;
1803                 }
1804                 isfirstblock = 0;
1805                 prev_instance = rr->naihdr.instance;
1806                 for (i = 0; i < elems; i++)
1807                         switch (size) {
1808                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1809                                 (*cb)(priv, l3_ipv6_addr,
1810                                                 &rr->entries.l3_ipv6[i]);
1811                                 break;
1812                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1813                                 (*cb)(priv, l3_ipv4_addr,
1814                                                 &rr->entries.l3_ipv4[i]);
1815                                 break;
1816                         case sizeof(struct qdio_brinfo_entry_l2):
1817                                 (*cb)(priv, l2_addr_lnid,
1818                                                 &rr->entries.l2[i]);
1819                                 break;
1820                         default:
1821                                 WARN_ON_ONCE(1);
1822                                 rc = -EIO;
1823                                 goto out;
1824                         }
1825         } while (rr->response.code == 0x0107 ||  /* channel busy */
1826                   (rr->response.code == 1 && /* list stored */
1827                    /* resume token is non-zero => list incomplete */
1828                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1829         (*response) = rr->response.code;
1830
1831 out:
1832         free_page((unsigned long)rr);
1833         return rc;
1834 }
1835 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1836
1837 static int __init init_QDIO(void)
1838 {
1839         int rc;
1840
1841         rc = qdio_debug_init();
1842         if (rc)
1843                 return rc;
1844         rc = qdio_setup_init();
1845         if (rc)
1846                 goto out_debug;
1847         rc = tiqdio_allocate_memory();
1848         if (rc)
1849                 goto out_cache;
1850         rc = tiqdio_register_thinints();
1851         if (rc)
1852                 goto out_ti;
1853         return 0;
1854
1855 out_ti:
1856         tiqdio_free_memory();
1857 out_cache:
1858         qdio_setup_exit();
1859 out_debug:
1860         qdio_debug_exit();
1861         return rc;
1862 }
1863
1864 static void __exit exit_QDIO(void)
1865 {
1866         tiqdio_unregister_thinints();
1867         tiqdio_free_memory();
1868         qdio_setup_exit();
1869         qdio_debug_exit();
1870 }
1871
1872 module_init(init_QDIO);
1873 module_exit(exit_QDIO);