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