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_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 = 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_primed(struct qdio_q *q, unsigned int start,
 442                                   int count)
 443 {
 444         int new;
 445
 446         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
 447
 448         /* for QEBSM the ACK was already set by EQBS */
 449         if (is_qebsm(q)) {
 450                 if (!q->u.in.ack_count) {
 451                         q->u.in.ack_count = count;
 452                         q->u.in.ack_start = start;
 453                         return;
 454                 }
 455
 456                 /* delete the previous ACK's */
 457                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 458                                q->u.in.ack_count);
 459                 q->u.in.ack_count = count;
 460                 q->u.in.ack_start = start;
 461                 return;
 462         }
 463
 464         /*
 465          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 466          * or by the next inbound run.
 467          */
 468         new = add_buf(start, count - 1);
 469         if (q->u.in.ack_count) {
 470                 /* reset the previous ACK but first set the new one */
 471                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 472                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 473         } else {
 474                 q->u.in.ack_count = 1;
 475                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 476         }
 477
 478         q->u.in.ack_start = new;
 479         count--;
 480         if (!count)
 481                 return;
 482         /* need to change ALL buffers to get more interrupts */
 483         set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
 484 }
 485
 486 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 487 {
 488         unsigned char state = 0;
 489         int count;
 490
 491         q->timestamp = get_tod_clock_fast();
 492
 493         /*
 494          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 495          * would return 0.
 496          */
 497         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 498         if (!count)
 499                 return 0;
 500
 501         /*
 502          * No siga sync here, as a PCI or we after a thin interrupt
 503          * already sync'ed the queues.
 504          */
 505         count = get_buf_states(q, start, &state, count, 1, 0);
 506         if (!count)
 507                 return 0;
 508
 509         switch (state) {
 510         case SLSB_P_INPUT_PRIMED:
 511                 inbound_primed(q, start, count);
 512                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 513                         qperf_inc(q, inbound_queue_full);
 514                 if (q->irq_ptr->perf_stat_enabled)
 515                         account_sbals(q, count);
 516                 return count;
 517         case SLSB_P_INPUT_ERROR:
 518                 process_buffer_error(q, start, count);
 519                 /*
 520                  * Interrupts may be avoided as long as the error is present
 521                  * so change the buffer state immediately to avoid starvation.
 522                  */
 523                 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
 524                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 525                         qperf_inc(q, inbound_queue_full);
 526                 if (q->irq_ptr->perf_stat_enabled)
 527                         account_sbals_error(q, count);
 528                 return count;
 529         case SLSB_CU_INPUT_EMPTY:
 530         case SLSB_P_INPUT_NOT_INIT:
 531         case SLSB_P_INPUT_ACK:
 532                 if (q->irq_ptr->perf_stat_enabled)
 533                         q->q_stats.nr_sbal_nop++;
 534                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 535                               q->nr, start);
 536                 return 0;
 537         default:
 538                 WARN_ON_ONCE(1);
 539                 return 0;
 540         }
 541 }
 542
 543 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 544 {
 545         int count;
 546
 547         count = get_inbound_buffer_frontier(q, start);
 548
 549         if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 550                 q->u.in.timestamp = get_tod_clock();
 551
 552         return count;
 553 }
 554
 555 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 556 {
 557         unsigned char state = 0;
 558
 559         if (!atomic_read(&q->nr_buf_used))
 560                 return 1;
 561
 562         if (need_siga_sync(q))
 563                 qdio_siga_sync_q(q);
 564         get_buf_state(q, start, &state, 0);
 565
 566         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 567                 /* more work coming */
 568                 return 0;
 569
 570         if (is_thinint_irq(q->irq_ptr))
 571                 return 1;
 572
 573         /* don't poll under z/VM */
 574         if (MACHINE_IS_VM)
 575                 return 1;
 576
 577         /*
 578          * At this point we know, that inbound first_to_check
 579          * has (probably) not moved (see qdio_inbound_processing).
 580          */
 581         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 582                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start);
 583                 return 1;
 584         } else
 585                 return 0;
 586 }
 587
 588 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 589 {
 590         unsigned char state = 0;
 591         int j, b = start;
 592
 593         for (j = 0; j < count; ++j) {
 594                 get_buf_state(q, b, &state, 0);
 595                 if (state == SLSB_P_OUTPUT_PENDING) {
 596                         struct qaob *aob = q->u.out.aobs[b];
 597                         if (aob == NULL)
 598                                 continue;
 599
 600                         q->u.out.sbal_state[b].flags |=
 601                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 602                         q->u.out.aobs[b] = NULL;
 603                 }
 604                 b = next_buf(b);
 605         }
 606 }
 607
 608 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 609                                         int bufnr)
 610 {
 611         unsigned long phys_aob = 0;
 612
 613         if (!q->aobs[bufnr]) {
 614                 struct qaob *aob = qdio_allocate_aob();
 615                 q->aobs[bufnr] = aob;
 616         }
 617         if (q->aobs[bufnr]) {
 618                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 619                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 620                 WARN_ON_ONCE(phys_aob & 0xFF);
 621         }
 622
 623         q->sbal_state[bufnr].flags = 0;
 624         return phys_aob;
 625 }
 626
 627 static void qdio_kick_handler(struct qdio_q *q, unsigned int count)
 628 {
 629         int start = q->first_to_kick;
 630
 631         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 632                 return;
 633
 634         if (q->is_input_q) {
 635                 qperf_inc(q, inbound_handler);
 636                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 637         } else {
 638                 qperf_inc(q, outbound_handler);
 639                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 640                               start, count);
 641         }
 642
 643         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 644                    q->irq_ptr->int_parm);
 645
 646         /* for the next time */
 647         q->first_to_kick = add_buf(start, count);
 648         q->qdio_error = 0;
 649 }
 650
 651 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 652 {
 653         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 654                 tasklet_schedule(&q->tasklet);
 655                 return 0;
 656         }
 657         return -EPERM;
 658 }
 659
 660 static void __qdio_inbound_processing(struct qdio_q *q)
 661 {
 662         unsigned int start = q->first_to_check;
 663         int count;
 664
 665         qperf_inc(q, tasklet_inbound);
 666
 667         count = qdio_inbound_q_moved(q, start);
 668         if (count == 0)
 669                 return;
 670
 671         start = add_buf(start, count);
 672         q->first_to_check = start;
 673         qdio_kick_handler(q, count);
 674
 675         if (!qdio_inbound_q_done(q, start)) {
 676                 /* means poll time is not yet over */
 677                 qperf_inc(q, tasklet_inbound_resched);
 678                 if (!qdio_tasklet_schedule(q))
 679                         return;
 680         }
 681
 682         qdio_stop_polling(q);
 683         /*
 684          * We need to check again to not lose initiative after
 685          * resetting the ACK state.
 686          */
 687         if (!qdio_inbound_q_done(q, start)) {
 688                 qperf_inc(q, tasklet_inbound_resched2);
 689                 qdio_tasklet_schedule(q);
 690         }
 691 }
 692
 693 void qdio_inbound_processing(unsigned long data)
 694 {
 695         struct qdio_q *q = (struct qdio_q *)data;
 696         __qdio_inbound_processing(q);
 697 }
 698
 699 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 700 {
 701         unsigned char state = 0;
 702         int count;
 703
 704         q->timestamp = get_tod_clock_fast();
 705
 706         if (need_siga_sync(q))
 707                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 708                     !pci_out_supported(q->irq_ptr)) ||
 709                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 710                     multicast_outbound(q)))
 711                         qdio_siga_sync_q(q);
 712
 713         count = atomic_read(&q->nr_buf_used);
 714         if (!count)
 715                 return 0;
 716
 717         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 718         if (!count)
 719                 return 0;
 720
 721         switch (state) {
 722         case SLSB_P_OUTPUT_EMPTY:
 723         case SLSB_P_OUTPUT_PENDING:
 724                 /* the adapter got it */
 725                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 726                         "out empty:%1d %02x", q->nr, count);
 727
 728                 atomic_sub(count, &q->nr_buf_used);
 729                 if (q->irq_ptr->perf_stat_enabled)
 730                         account_sbals(q, count);
 731                 return count;
 732         case SLSB_P_OUTPUT_ERROR:
 733                 process_buffer_error(q, start, count);
 734                 atomic_sub(count, &q->nr_buf_used);
 735                 if (q->irq_ptr->perf_stat_enabled)
 736                         account_sbals_error(q, count);
 737                 return count;
 738         case SLSB_CU_OUTPUT_PRIMED:
 739                 /* the adapter has not fetched the output yet */
 740                 if (q->irq_ptr->perf_stat_enabled)
 741                         q->q_stats.nr_sbal_nop++;
 742                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 743                               q->nr);
 744                 return 0;
 745         case SLSB_P_OUTPUT_NOT_INIT:
 746         case SLSB_P_OUTPUT_HALTED:
 747                 return 0;
 748         default:
 749                 WARN_ON_ONCE(1);
 750                 return 0;
 751         }
 752 }
 753
 754 /* all buffers processed? */
 755 static inline int qdio_outbound_q_done(struct qdio_q *q)
 756 {
 757         return atomic_read(&q->nr_buf_used) == 0;
 758 }
 759
 760 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 761 {
 762         int count;
 763
 764         count = get_outbound_buffer_frontier(q, start);
 765
 766         if (count) {
 767                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 768                 if (q->u.out.use_cq)
 769                         qdio_handle_aobs(q, start, count);
 770         }
 771
 772         return count;
 773 }
 774
 775 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 776                                 unsigned long aob)
 777 {
 778         int retries = 0, cc;
 779         unsigned int busy_bit;
 780
 781         if (!need_siga_out(q))
 782                 return 0;
 783
 784         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 785 retry:
 786         qperf_inc(q, siga_write);
 787
 788         cc = qdio_siga_output(q, count, &busy_bit, aob);
 789         switch (cc) {
 790         case 0:
 791                 break;
 792         case 2:
 793                 if (busy_bit) {
 794                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 795                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 796                                 goto retry;
 797                         }
 798                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 799                         cc = -EBUSY;
 800                 } else {
 801                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 802                         cc = -ENOBUFS;
 803                 }
 804                 break;
 805         case 1:
 806         case 3:
 807                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 808                 cc = -EIO;
 809                 break;
 810         }
 811         if (retries) {
 812                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 813                 DBF_ERROR("count:%u", retries);
 814         }
 815         return cc;
 816 }
 817
 818 static void __qdio_outbound_processing(struct qdio_q *q)
 819 {
 820         unsigned int start = q->first_to_check;
 821         int count;
 822
 823         qperf_inc(q, tasklet_outbound);
 824         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 825
 826         count = qdio_outbound_q_moved(q, start);
 827         if (count) {
 828                 q->first_to_check = add_buf(start, count);
 829                 qdio_kick_handler(q, count);
 830         }
 831
 832         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 833             !qdio_outbound_q_done(q))
 834                 goto sched;
 835
 836         if (q->u.out.pci_out_enabled)
 837                 return;
 838
 839         /*
 840          * Now we know that queue type is either qeth without pci enabled
 841          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 842          * is noticed and outbound_handler is called after some time.
 843          */
 844         if (qdio_outbound_q_done(q))
 845                 del_timer_sync(&q->u.out.timer);
 846         else
 847                 if (!timer_pending(&q->u.out.timer) &&
 848                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 849                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 850         return;
 851
 852 sched:
 853         qdio_tasklet_schedule(q);
 854 }
 855
 856 /* outbound tasklet */
 857 void qdio_outbound_processing(unsigned long data)
 858 {
 859         struct qdio_q *q = (struct qdio_q *)data;
 860         __qdio_outbound_processing(q);
 861 }
 862
 863 void qdio_outbound_timer(struct timer_list *t)
 864 {
 865         struct qdio_q *q = from_timer(q, t, u.out.timer);
 866
 867         qdio_tasklet_schedule(q);
 868 }
 869
 870 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 871 {
 872         struct qdio_q *out;
 873         int i;
 874
 875         if (!pci_out_supported(irq) || !irq->scan_threshold)
 876                 return;
 877
 878         for_each_output_queue(irq, out, i)
 879                 if (!qdio_outbound_q_done(out))
 880                         qdio_tasklet_schedule(out);
 881 }
 882
 883 static void __tiqdio_inbound_processing(struct qdio_q *q)
 884 {
 885         unsigned int start = q->first_to_check;
 886         int count;
 887
 888         qperf_inc(q, tasklet_inbound);
 889         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 890                 qdio_sync_queues(q);
 891
 892         /* The interrupt could be caused by a PCI request: */
 893         qdio_check_outbound_pci_queues(q->irq_ptr);
 894
 895         count = qdio_inbound_q_moved(q, start);
 896         if (count == 0)
 897                 return;
 898
 899         start = add_buf(start, count);
 900         q->first_to_check = start;
 901         qdio_kick_handler(q, count);
 902
 903         if (!qdio_inbound_q_done(q, start)) {
 904                 qperf_inc(q, tasklet_inbound_resched);
 905                 if (!qdio_tasklet_schedule(q))
 906                         return;
 907         }
 908
 909         qdio_stop_polling(q);
 910         /*
 911          * We need to check again to not lose initiative after
 912          * resetting the ACK state.
 913          */
 914         if (!qdio_inbound_q_done(q, start)) {
 915                 qperf_inc(q, tasklet_inbound_resched2);
 916                 qdio_tasklet_schedule(q);
 917         }
 918 }
 919
 920 void tiqdio_inbound_processing(unsigned long data)
 921 {
 922         struct qdio_q *q = (struct qdio_q *)data;
 923         __tiqdio_inbound_processing(q);
 924 }
 925
 926 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 927                                   enum qdio_irq_states state)
 928 {
 929         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 930
 931         irq_ptr->state = state;
 932         mb();
 933 }
 934
 935 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 936 {
 937         if (irb->esw.esw0.erw.cons) {
 938                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 939                 DBF_ERROR_HEX(irb, 64);
 940                 DBF_ERROR_HEX(irb->ecw, 64);
 941         }
 942 }
 943
 944 /* PCI interrupt handler */
 945 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 946 {
 947         int i;
 948         struct qdio_q *q;
 949
 950         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 951                 return;
 952
 953         for_each_input_queue(irq_ptr, q, i) {
 954                 if (q->u.in.queue_start_poll) {
 955                         /* skip if polling is enabled or already in work */
 956                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 957                                      &q->u.in.queue_irq_state)) {
 958                                 QDIO_PERF_STAT_INC(irq_ptr, int_discarded);
 959                                 continue;
 960                         }
 961                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 962                                                  q->irq_ptr->int_parm);
 963                 } else {
 964                         tasklet_schedule(&q->tasklet);
 965                 }
 966         }
 967
 968         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 969                 return;
 970
 971         for_each_output_queue(irq_ptr, q, i) {
 972                 if (qdio_outbound_q_done(q))
 973                         continue;
 974                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 975                         qdio_siga_sync_q(q);
 976                 qdio_tasklet_schedule(q);
 977         }
 978 }
 979
 980 static void qdio_handle_activate_check(struct ccw_device *cdev,
 981                                 unsigned long intparm, int cstat, int dstat)
 982 {
 983         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 984         struct qdio_q *q;
 985         int count;
 986
 987         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 988         DBF_ERROR("intp :%lx", intparm);
 989         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 990
 991         if (irq_ptr->nr_input_qs) {
 992                 q = irq_ptr->input_qs[0];
 993         } else if (irq_ptr->nr_output_qs) {
 994                 q = irq_ptr->output_qs[0];
 995         } else {
 996                 dump_stack();
 997                 goto no_handler;
 998         }
 999
1000         count = sub_buf(q->first_to_check, q->first_to_kick);
1001         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1002                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1003 no_handler:
1004         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1005         /*
1006          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1007          * Therefore we call the LGR detection function here.
1008          */
1009         lgr_info_log();
1010 }
1011
1012 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1013                                       int dstat)
1014 {
1015         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1016
1017         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1018
1019         if (cstat)
1020                 goto error;
1021         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1022                 goto error;
1023         if (!(dstat & DEV_STAT_DEV_END))
1024                 goto error;
1025         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1026         return;
1027
1028 error:
1029         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1030         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1031         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1032 }
1033
1034 /* qdio interrupt handler */
1035 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1036                       struct irb *irb)
1037 {
1038         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1039         struct subchannel_id schid;
1040         int cstat, dstat;
1041
1042         if (!intparm || !irq_ptr) {
1043                 ccw_device_get_schid(cdev, &schid);
1044                 DBF_ERROR("qint:%4x", schid.sch_no);
1045                 return;
1046         }
1047
1048         if (irq_ptr->perf_stat_enabled)
1049                 irq_ptr->perf_stat.qdio_int++;
1050
1051         if (IS_ERR(irb)) {
1052                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1053                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1054                 wake_up(&cdev->private->wait_q);
1055                 return;
1056         }
1057         qdio_irq_check_sense(irq_ptr, irb);
1058         cstat = irb->scsw.cmd.cstat;
1059         dstat = irb->scsw.cmd.dstat;
1060
1061         switch (irq_ptr->state) {
1062         case QDIO_IRQ_STATE_INACTIVE:
1063                 qdio_establish_handle_irq(cdev, cstat, dstat);
1064                 break;
1065         case QDIO_IRQ_STATE_CLEANUP:
1066                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1067                 break;
1068         case QDIO_IRQ_STATE_ESTABLISHED:
1069         case QDIO_IRQ_STATE_ACTIVE:
1070                 if (cstat & SCHN_STAT_PCI) {
1071                         qdio_int_handler_pci(irq_ptr);
1072                         return;
1073                 }
1074                 if (cstat || dstat)
1075                         qdio_handle_activate_check(cdev, intparm, cstat,
1076                                                    dstat);
1077                 break;
1078         case QDIO_IRQ_STATE_STOPPED:
1079                 break;
1080         default:
1081                 WARN_ON_ONCE(1);
1082         }
1083         wake_up(&cdev->private->wait_q);
1084 }
1085
1086 /**
1087  * qdio_get_ssqd_desc - get qdio subchannel description
1088  * @cdev: ccw device to get description for
1089  * @data: where to store the ssqd
1090  *
1091  * Returns 0 or an error code. The results of the chsc are stored in the
1092  * specified structure.
1093  */
1094 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1095                        struct qdio_ssqd_desc *data)
1096 {
1097         struct subchannel_id schid;
1098
1099         if (!cdev || !cdev->private)
1100                 return -EINVAL;
1101
1102         ccw_device_get_schid(cdev, &schid);
1103         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1104         return qdio_setup_get_ssqd(NULL, &schid, data);
1105 }
1106 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1107
1108 static void qdio_shutdown_queues(struct ccw_device *cdev)
1109 {
1110         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1111         struct qdio_q *q;
1112         int i;
1113
1114         for_each_input_queue(irq_ptr, q, i)
1115                 tasklet_kill(&q->tasklet);
1116
1117         for_each_output_queue(irq_ptr, q, i) {
1118                 del_timer_sync(&q->u.out.timer);
1119                 tasklet_kill(&q->tasklet);
1120         }
1121 }
1122
1123 /**
1124  * qdio_shutdown - shut down a qdio subchannel
1125  * @cdev: associated ccw device
1126  * @how: use halt or clear to shutdown
1127  */
1128 int qdio_shutdown(struct ccw_device *cdev, int how)
1129 {
1130         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1131         struct subchannel_id schid;
1132         int rc;
1133
1134         if (!irq_ptr)
1135                 return -ENODEV;
1136
1137         WARN_ON_ONCE(irqs_disabled());
1138         ccw_device_get_schid(cdev, &schid);
1139         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1140
1141         mutex_lock(&irq_ptr->setup_mutex);
1142         /*
1143          * Subchannel was already shot down. We cannot prevent being called
1144          * twice since cio may trigger a shutdown asynchronously.
1145          */
1146         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1147                 mutex_unlock(&irq_ptr->setup_mutex);
1148                 return 0;
1149         }
1150
1151         /*
1152          * Indicate that the device is going down. Scheduling the queue
1153          * tasklets is forbidden from here on.
1154          */
1155         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1156
1157         tiqdio_remove_device(irq_ptr);
1158         qdio_shutdown_queues(cdev);
1159         qdio_shutdown_debug_entries(irq_ptr);
1160
1161         /* cleanup subchannel */
1162         spin_lock_irq(get_ccwdev_lock(cdev));
1163
1164         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1165                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1166         else
1167                 /* default behaviour is halt */
1168                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1169         if (rc) {
1170                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1171                 DBF_ERROR("rc:%4d", rc);
1172                 goto no_cleanup;
1173         }
1174
1175         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1176         spin_unlock_irq(get_ccwdev_lock(cdev));
1177         wait_event_interruptible_timeout(cdev->private->wait_q,
1178                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1179                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1180                 10 * HZ);
1181         spin_lock_irq(get_ccwdev_lock(cdev));
1182
1183 no_cleanup:
1184         qdio_shutdown_thinint(irq_ptr);
1185
1186         /* restore interrupt handler */
1187         if ((void *)cdev->handler == (void *)qdio_int_handler) {
1188                 cdev->handler = irq_ptr->orig_handler;
1189                 cdev->private->intparm = 0;
1190         }
1191         spin_unlock_irq(get_ccwdev_lock(cdev));
1192
1193         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1194         mutex_unlock(&irq_ptr->setup_mutex);
1195         if (rc)
1196                 return rc;
1197         return 0;
1198 }
1199 EXPORT_SYMBOL_GPL(qdio_shutdown);
1200
1201 /**
1202  * qdio_free - free data structures for a qdio subchannel
1203  * @cdev: associated ccw device
1204  */
1205 int qdio_free(struct ccw_device *cdev)
1206 {
1207         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1208         struct subchannel_id schid;
1209
1210         if (!irq_ptr)
1211                 return -ENODEV;
1212
1213         ccw_device_get_schid(cdev, &schid);
1214         DBF_EVENT("qfree:%4x", schid.sch_no);
1215         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1216         mutex_lock(&irq_ptr->setup_mutex);
1217
1218         irq_ptr->debug_area = NULL;
1219         cdev->private->qdio_data = NULL;
1220         mutex_unlock(&irq_ptr->setup_mutex);
1221
1222         qdio_release_memory(irq_ptr);
1223         return 0;
1224 }
1225 EXPORT_SYMBOL_GPL(qdio_free);
1226
1227 /**
1228  * qdio_allocate - allocate qdio queues and associated data
1229  * @init_data: initialization data
1230  */
1231 int qdio_allocate(struct qdio_initialize *init_data)
1232 {
1233         struct subchannel_id schid;
1234         struct qdio_irq *irq_ptr;
1235
1236         ccw_device_get_schid(init_data->cdev, &schid);
1237         DBF_EVENT("qallocate:%4x", schid.sch_no);
1238
1239         if ((init_data->no_input_qs && !init_data->input_handler) ||
1240             (init_data->no_output_qs && !init_data->output_handler))
1241                 return -EINVAL;
1242
1243         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1244             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1245                 return -EINVAL;
1246
1247         if ((!init_data->input_sbal_addr_array) ||
1248             (!init_data->output_sbal_addr_array))
1249                 return -EINVAL;
1250
1251         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1252         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1253         if (!irq_ptr)
1254                 goto out_err;
1255
1256         mutex_init(&irq_ptr->setup_mutex);
1257         if (qdio_allocate_dbf(init_data, irq_ptr))
1258                 goto out_rel;
1259
1260         /*
1261          * Allocate a page for the chsc calls in qdio_establish.
1262          * Must be pre-allocated since a zfcp recovery will call
1263          * qdio_establish. In case of low memory and swap on a zfcp disk
1264          * we may not be able to allocate memory otherwise.
1265          */
1266         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1267         if (!irq_ptr->chsc_page)
1268                 goto out_rel;
1269
1270         /* qdr is used in ccw1.cda which is u32 */
1271         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1272         if (!irq_ptr->qdr)
1273                 goto out_rel;
1274
1275         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1276                              init_data->no_output_qs))
1277                 goto out_rel;
1278
1279         INIT_LIST_HEAD(&irq_ptr->entry);
1280         init_data->cdev->private->qdio_data = irq_ptr;
1281         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1282         return 0;
1283 out_rel:
1284         qdio_release_memory(irq_ptr);
1285 out_err:
1286         return -ENOMEM;
1287 }
1288 EXPORT_SYMBOL_GPL(qdio_allocate);
1289
1290 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1291 {
1292         struct qdio_q *q = irq_ptr->input_qs[0];
1293         int i, use_cq = 0;
1294
1295         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1296                 use_cq = 1;
1297
1298         for_each_output_queue(irq_ptr, q, i) {
1299                 if (use_cq) {
1300                         if (multicast_outbound(q))
1301                                 continue;
1302                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1303                                 use_cq = 0;
1304                                 continue;
1305                         }
1306                 } else
1307                         qdio_disable_async_operation(&q->u.out);
1308         }
1309         DBF_EVENT("use_cq:%d", use_cq);
1310 }
1311
1312 /**
1313  * qdio_establish - establish queues on a qdio subchannel
1314  * @init_data: initialization data
1315  */
1316 int qdio_establish(struct qdio_initialize *init_data)
1317 {
1318         struct ccw_device *cdev = init_data->cdev;
1319         struct subchannel_id schid;
1320         struct qdio_irq *irq_ptr;
1321         int rc;
1322
1323         ccw_device_get_schid(cdev, &schid);
1324         DBF_EVENT("qestablish:%4x", schid.sch_no);
1325
1326         irq_ptr = cdev->private->qdio_data;
1327         if (!irq_ptr)
1328                 return -ENODEV;
1329
1330         mutex_lock(&irq_ptr->setup_mutex);
1331         qdio_setup_irq(init_data);
1332
1333         rc = qdio_establish_thinint(irq_ptr);
1334         if (rc) {
1335                 mutex_unlock(&irq_ptr->setup_mutex);
1336                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1337                 return rc;
1338         }
1339
1340         /* establish q */
1341         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1342         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1343         irq_ptr->ccw.count = irq_ptr->equeue.count;
1344         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1345
1346         spin_lock_irq(get_ccwdev_lock(cdev));
1347         ccw_device_set_options_mask(cdev, 0);
1348
1349         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1350         spin_unlock_irq(get_ccwdev_lock(cdev));
1351         if (rc) {
1352                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1353                 DBF_ERROR("rc:%4x", rc);
1354                 mutex_unlock(&irq_ptr->setup_mutex);
1355                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1356                 return rc;
1357         }
1358
1359         wait_event_interruptible_timeout(cdev->private->wait_q,
1360                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1361                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1362
1363         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1364                 mutex_unlock(&irq_ptr->setup_mutex);
1365                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1366                 return -EIO;
1367         }
1368
1369         qdio_setup_ssqd_info(irq_ptr);
1370
1371         qdio_detect_hsicq(irq_ptr);
1372
1373         /* qebsm is now setup if available, initialize buffer states */
1374         qdio_init_buf_states(irq_ptr);
1375
1376         mutex_unlock(&irq_ptr->setup_mutex);
1377         qdio_print_subchannel_info(irq_ptr, cdev);
1378         qdio_setup_debug_entries(irq_ptr, cdev);
1379         return 0;
1380 }
1381 EXPORT_SYMBOL_GPL(qdio_establish);
1382
1383 /**
1384  * qdio_activate - activate queues on a qdio subchannel
1385  * @cdev: associated cdev
1386  */
1387 int qdio_activate(struct ccw_device *cdev)
1388 {
1389         struct subchannel_id schid;
1390         struct qdio_irq *irq_ptr;
1391         int rc;
1392
1393         ccw_device_get_schid(cdev, &schid);
1394         DBF_EVENT("qactivate:%4x", schid.sch_no);
1395
1396         irq_ptr = cdev->private->qdio_data;
1397         if (!irq_ptr)
1398                 return -ENODEV;
1399
1400         mutex_lock(&irq_ptr->setup_mutex);
1401         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1402                 rc = -EBUSY;
1403                 goto out;
1404         }
1405
1406         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1407         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1408         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1409         irq_ptr->ccw.cda = 0;
1410
1411         spin_lock_irq(get_ccwdev_lock(cdev));
1412         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1413
1414         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1415                               0, DOIO_DENY_PREFETCH);
1416         spin_unlock_irq(get_ccwdev_lock(cdev));
1417         if (rc) {
1418                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1419                 DBF_ERROR("rc:%4x", rc);
1420                 goto out;
1421         }
1422
1423         if (is_thinint_irq(irq_ptr))
1424                 tiqdio_add_device(irq_ptr);
1425
1426         /* wait for subchannel to become active */
1427         msleep(5);
1428
1429         switch (irq_ptr->state) {
1430         case QDIO_IRQ_STATE_STOPPED:
1431         case QDIO_IRQ_STATE_ERR:
1432                 rc = -EIO;
1433                 break;
1434         default:
1435                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1436                 rc = 0;
1437         }
1438 out:
1439         mutex_unlock(&irq_ptr->setup_mutex);
1440         return rc;
1441 }
1442 EXPORT_SYMBOL_GPL(qdio_activate);
1443
1444 static inline int buf_in_between(int bufnr, int start, int count)
1445 {
1446         int end = add_buf(start, count);
1447
1448         if (end > start) {
1449                 if (bufnr >= start && bufnr < end)
1450                         return 1;
1451                 else
1452                         return 0;
1453         }
1454
1455         /* wrap-around case */
1456         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1457             (bufnr < end))
1458                 return 1;
1459         else
1460                 return 0;
1461 }
1462
1463 /**
1464  * handle_inbound - reset processed input buffers
1465  * @q: queue containing the buffers
1466  * @callflags: flags
1467  * @bufnr: first buffer to process
1468  * @count: how many buffers are emptied
1469  */
1470 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1471                           int bufnr, int count)
1472 {
1473         int diff;
1474
1475         qperf_inc(q, inbound_call);
1476
1477         if (!q->u.in.ack_count)
1478                 goto set;
1479
1480         /* protect against stop polling setting an ACK for an emptied slsb */
1481         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1482                 /* overwriting everything, just delete polling status */
1483                 q->u.in.ack_count = 0;
1484                 goto set;
1485         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1486                 if (is_qebsm(q)) {
1487                         /* partial overwrite, just update ack_start */
1488                         diff = add_buf(bufnr, count);
1489                         diff = sub_buf(diff, q->u.in.ack_start);
1490                         q->u.in.ack_count -= diff;
1491                         if (q->u.in.ack_count <= 0) {
1492                                 q->u.in.ack_count = 0;
1493                                 goto set;
1494                         }
1495                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1496                 } else {
1497                         /* the only ACK will be deleted */
1498                         q->u.in.ack_count = 0;
1499                 }
1500         }
1501
1502 set:
1503         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1504         atomic_add(count, &q->nr_buf_used);
1505
1506         if (need_siga_in(q))
1507                 return qdio_siga_input(q);
1508
1509         return 0;
1510 }
1511
1512 /**
1513  * handle_outbound - process filled outbound buffers
1514  * @q: queue containing the buffers
1515  * @callflags: flags
1516  * @bufnr: first buffer to process
1517  * @count: how many buffers are filled
1518  */
1519 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1520                            unsigned int bufnr, unsigned int count)
1521 {
1522         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1523         unsigned char state = 0;
1524         int used, rc = 0;
1525
1526         qperf_inc(q, outbound_call);
1527
1528         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1529         used = atomic_add_return(count, &q->nr_buf_used);
1530
1531         if (used == QDIO_MAX_BUFFERS_PER_Q)
1532                 qperf_inc(q, outbound_queue_full);
1533
1534         if (callflags & QDIO_FLAG_PCI_OUT) {
1535                 q->u.out.pci_out_enabled = 1;
1536                 qperf_inc(q, pci_request_int);
1537         } else
1538                 q->u.out.pci_out_enabled = 0;
1539
1540         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1541                 unsigned long phys_aob = 0;
1542
1543                 if (q->u.out.use_cq && count == 1)
1544                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1545
1546                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1547         } else if (need_siga_sync(q)) {
1548                 rc = qdio_siga_sync_q(q);
1549         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1550                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1551                    state == SLSB_CU_OUTPUT_PRIMED) {
1552                 /* The previous buffer is not processed yet, tack on. */
1553                 qperf_inc(q, fast_requeue);
1554         } else {
1555                 rc = qdio_kick_outbound_q(q, count, 0);
1556         }
1557
1558         /* Let drivers implement their own completion scanning: */
1559         if (!scan_threshold)
1560                 return rc;
1561
1562         /* in case of SIGA errors we must process the error immediately */
1563         if (used >= scan_threshold || rc)
1564                 qdio_tasklet_schedule(q);
1565         else
1566                 /* free the SBALs in case of no further traffic */
1567                 if (!timer_pending(&q->u.out.timer) &&
1568                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1569                         mod_timer(&q->u.out.timer, jiffies + HZ);
1570         return rc;
1571 }
1572
1573 /**
1574  * do_QDIO - process input or output buffers
1575  * @cdev: associated ccw_device for the qdio subchannel
1576  * @callflags: input or output and special flags from the program
1577  * @q_nr: queue number
1578  * @bufnr: buffer number
1579  * @count: how many buffers to process
1580  */
1581 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1582             int q_nr, unsigned int bufnr, unsigned int count)
1583 {
1584         struct qdio_irq *irq_ptr;
1585
1586         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1587                 return -EINVAL;
1588
1589         irq_ptr = cdev->private->qdio_data;
1590         if (!irq_ptr)
1591                 return -ENODEV;
1592
1593         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1594                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1595
1596         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1597                 return -EIO;
1598         if (!count)
1599                 return 0;
1600         if (callflags & QDIO_FLAG_SYNC_INPUT)
1601                 return handle_inbound(irq_ptr->input_qs[q_nr],
1602                                       callflags, bufnr, count);
1603         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1604                 return handle_outbound(irq_ptr->output_qs[q_nr],
1605                                        callflags, bufnr, count);
1606         return -EINVAL;
1607 }
1608 EXPORT_SYMBOL_GPL(do_QDIO);
1609
1610 /**
1611  * qdio_start_irq - process input buffers
1612  * @cdev: associated ccw_device for the qdio subchannel
1613  * @nr: input queue number
1614  *
1615  * Return codes
1616  *   0 - success
1617  *   1 - irqs not started since new data is available
1618  */
1619 int qdio_start_irq(struct ccw_device *cdev, int nr)
1620 {
1621         struct qdio_q *q;
1622         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1623
1624         if (!irq_ptr)
1625                 return -ENODEV;
1626         q = irq_ptr->input_qs[nr];
1627
1628         clear_nonshared_ind(irq_ptr);
1629         qdio_stop_polling(q);
1630         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1631
1632         /*
1633          * We need to check again to not lose initiative after
1634          * resetting the ACK state.
1635          */
1636         if (test_nonshared_ind(irq_ptr))
1637                 goto rescan;
1638         if (!qdio_inbound_q_done(q, q->first_to_check))
1639                 goto rescan;
1640         return 0;
1641
1642 rescan:
1643         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1644                              &q->u.in.queue_irq_state))
1645                 return 0;
1646         else
1647                 return 1;
1648
1649 }
1650 EXPORT_SYMBOL(qdio_start_irq);
1651
1652 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1653                                 unsigned int *error)
1654 {
1655         unsigned int start = q->first_to_check;
1656         int count;
1657
1658         count = q->is_input_q ? qdio_inbound_q_moved(q, start) :
1659                                 qdio_outbound_q_moved(q, start);
1660         if (count == 0)
1661                 return 0;
1662
1663         *bufnr = start;
1664         *error = q->qdio_error;
1665
1666         /* for the next time */
1667         q->first_to_check = add_buf(start, count);
1668         q->qdio_error = 0;
1669
1670         return count;
1671 }
1672
1673 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1674                        unsigned int *bufnr, unsigned int *error)
1675 {
1676         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1677         struct qdio_q *q;
1678
1679         if (!irq_ptr)
1680                 return -ENODEV;
1681         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1682
1683         if (need_siga_sync(q))
1684                 qdio_siga_sync_q(q);
1685
1686         return __qdio_inspect_queue(q, bufnr, error);
1687 }
1688 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1689
1690 /**
1691  * qdio_get_next_buffers - process input buffers
1692  * @cdev: associated ccw_device for the qdio subchannel
1693  * @nr: input queue number
1694  * @bufnr: first filled buffer number
1695  * @error: buffers are in error state
1696  *
1697  * Return codes
1698  *   < 0 - error
1699  *   = 0 - no new buffers found
1700  *   > 0 - number of processed buffers
1701  */
1702 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1703                           int *error)
1704 {
1705         struct qdio_q *q;
1706         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1707
1708         if (!irq_ptr)
1709                 return -ENODEV;
1710         q = irq_ptr->input_qs[nr];
1711
1712         /*
1713          * Cannot rely on automatic sync after interrupt since queues may
1714          * also be examined without interrupt.
1715          */
1716         if (need_siga_sync(q))
1717                 qdio_sync_queues(q);
1718
1719         qdio_check_outbound_pci_queues(irq_ptr);
1720
1721         /* Note: upper-layer MUST stop processing immediately here ... */
1722         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1723                 return -EIO;
1724
1725         return __qdio_inspect_queue(q, bufnr, error);
1726 }
1727 EXPORT_SYMBOL(qdio_get_next_buffers);
1728
1729 /**
1730  * qdio_stop_irq - disable interrupt processing for the device
1731  * @cdev: associated ccw_device for the qdio subchannel
1732  * @nr: input queue number
1733  *
1734  * Return codes
1735  *   0 - interrupts were already disabled
1736  *   1 - interrupts successfully disabled
1737  */
1738 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1739 {
1740         struct qdio_q *q;
1741         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1742
1743         if (!irq_ptr)
1744                 return -ENODEV;
1745         q = irq_ptr->input_qs[nr];
1746
1747         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1748                              &q->u.in.queue_irq_state))
1749                 return 0;
1750         else
1751                 return 1;
1752 }
1753 EXPORT_SYMBOL(qdio_stop_irq);
1754
1755 /**
1756  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1757  * @schid:              Subchannel ID.
1758  * @cnc:                Boolean Change-Notification Control
1759  * @response:           Response code will be stored at this address
1760  * @cb:                 Callback function will be executed for each element
1761  *                      of the address list
1762  * @priv:               Pointer to pass to the callback function.
1763  *
1764  * Performs "Store-network-bridging-information list" operation and calls
1765  * the callback function for every entry in the list. If "change-
1766  * notification-control" is set, further changes in the address list
1767  * will be reported via the IPA command.
1768  */
1769 int qdio_pnso_brinfo(struct subchannel_id schid,
1770                 int cnc, u16 *response,
1771                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1772                                 void *entry),
1773                 void *priv)
1774 {
1775         struct chsc_pnso_area *rr;
1776         int rc;
1777         u32 prev_instance = 0;
1778         int isfirstblock = 1;
1779         int i, size, elems;
1780
1781         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1782         if (rr == NULL)
1783                 return -ENOMEM;
1784         do {
1785                 /* on the first iteration, naihdr.resume_token will be zero */
1786                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1787                 if (rc != 0 && rc != -EBUSY)
1788                         goto out;
1789                 if (rr->response.code != 1) {
1790                         rc = -EIO;
1791                         continue;
1792                 } else
1793                         rc = 0;
1794
1795                 if (cb == NULL)
1796                         continue;
1797
1798                 size = rr->naihdr.naids;
1799                 elems = (rr->response.length -
1800                                 sizeof(struct chsc_header) -
1801                                 sizeof(struct chsc_brinfo_naihdr)) /
1802                                 size;
1803
1804                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1805                         /* Inform the caller that they need to scrap */
1806                         /* the data that was already reported via cb */
1807                                 rc = -EAGAIN;
1808                                 break;
1809                 }
1810                 isfirstblock = 0;
1811                 prev_instance = rr->naihdr.instance;
1812                 for (i = 0; i < elems; i++)
1813                         switch (size) {
1814                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1815                                 (*cb)(priv, l3_ipv6_addr,
1816                                                 &rr->entries.l3_ipv6[i]);
1817                                 break;
1818                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1819                                 (*cb)(priv, l3_ipv4_addr,
1820                                                 &rr->entries.l3_ipv4[i]);
1821                                 break;
1822                         case sizeof(struct qdio_brinfo_entry_l2):
1823                                 (*cb)(priv, l2_addr_lnid,
1824                                                 &rr->entries.l2[i]);
1825                                 break;
1826                         default:
1827                                 WARN_ON_ONCE(1);
1828                                 rc = -EIO;
1829                                 goto out;
1830                         }
1831         } while (rr->response.code == 0x0107 ||  /* channel busy */
1832                   (rr->response.code == 1 && /* list stored */
1833                    /* resume token is non-zero => list incomplete */
1834                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1835         (*response) = rr->response.code;
1836
1837 out:
1838         free_page((unsigned long)rr);
1839         return rc;
1840 }
1841 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1842
1843 static int __init init_QDIO(void)
1844 {
1845         int rc;
1846
1847         rc = qdio_debug_init();
1848         if (rc)
1849                 return rc;
1850         rc = qdio_setup_init();
1851         if (rc)
1852                 goto out_debug;
1853         rc = tiqdio_allocate_memory();
1854         if (rc)
1855                 goto out_cache;
1856         rc = tiqdio_register_thinints();
1857         if (rc)
1858                 goto out_ti;
1859         return 0;
1860
1861 out_ti:
1862         tiqdio_free_memory();
1863 out_cache:
1864         qdio_setup_exit();
1865 out_debug:
1866         qdio_debug_exit();
1867         return rc;
1868 }
1869
1870 static void __exit exit_QDIO(void)
1871 {
1872         tiqdio_unregister_thinints();
1873         tiqdio_free_memory();
1874         qdio_setup_exit();
1875         qdio_debug_exit();
1876 }
1877
1878 module_init(init_QDIO);
1879 module_exit(exit_QDIO);