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/kmemleak.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         qperf_inc(q, sqbs);
 174
 175         if (!q->is_input_q)
 176                 nr += q->irq_ptr->nr_input_qs;
 177 again:
 178         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 179
 180         switch (ccq) {
 181         case 0:
 182         case 32:
 183                 /* all done, or active buffer adapter-owned */
 184                 WARN_ON_ONCE(tmp_count);
 185                 return count - tmp_count;
 186         case 96:
 187                 /* not all buffers processed */
 188                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 189                 qperf_inc(q, sqbs_partial);
 190                 goto again;
 191         default:
 192                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 193                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 194                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 195                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
 196                            q->first_to_check, count, q->irq_ptr->int_parm);
 197                 return 0;
 198         }
 199 }
 200
 201 /*
 202  * Returns number of examined buffers and their common state in *state.
 203  * Requested number of buffers-to-examine must be > 0.
 204  */
 205 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 206                                  unsigned char *state, unsigned int count,
 207                                  int auto_ack)
 208 {
 209         unsigned char __state = 0;
 210         int i = 1;
 211
 212         if (is_qebsm(q))
 213                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 214
 215         /* get initial state: */
 216         __state = q->slsb.val[bufnr];
 217
 218         /* Bail out early if there is no work on the queue: */
 219         if (__state & SLSB_OWNER_CU)
 220                 goto out;
 221
 222         for (; i < count; i++) {
 223                 bufnr = next_buf(bufnr);
 224
 225                 /* stop if next state differs from initial state: */
 226                 if (q->slsb.val[bufnr] != __state)
 227                         break;
 228         }
 229
 230 out:
 231         *state = __state;
 232         return i;
 233 }
 234
 235 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 236                                 unsigned char *state, int auto_ack)
 237 {
 238         return get_buf_states(q, bufnr, state, 1, auto_ack);
 239 }
 240
 241 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 242 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 243                                  unsigned char state, int count)
 244 {
 245         int i;
 246
 247         if (is_qebsm(q))
 248                 return qdio_do_sqbs(q, state, bufnr, count);
 249
 250         /* Ensure that all preceding changes to the SBALs are visible: */
 251         mb();
 252
 253         for (i = 0; i < count; i++) {
 254                 WRITE_ONCE(q->slsb.val[bufnr], state);
 255                 bufnr = next_buf(bufnr);
 256         }
 257
 258         /* Make our SLSB changes visible: */
 259         mb();
 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_sync_input_queue(struct qdio_q *q)
 306 {
 307         return qdio_siga_sync(q, 0, q->mask);
 308 }
 309
 310 static inline int qdio_sync_output_queue(struct qdio_q *q)
 311 {
 312         return qdio_siga_sync(q, q->mask, 0);
 313 }
 314
 315 static inline int qdio_siga_sync_q(struct qdio_q *q)
 316 {
 317         if (q->is_input_q)
 318                 return qdio_sync_input_queue(q);
 319         else
 320                 return qdio_sync_output_queue(q);
 321 }
 322
 323 static int qdio_siga_output(struct qdio_q *q, unsigned int count,
 324                             unsigned int *busy_bit, unsigned long aob)
 325 {
 326         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 327         unsigned int fc = QDIO_SIGA_WRITE;
 328         u64 start_time = 0;
 329         int retries = 0, cc;
 330
 331         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
 332                 if (count > 1)
 333                         fc = QDIO_SIGA_WRITEM;
 334                 else if (aob)
 335                         fc = QDIO_SIGA_WRITEQ;
 336         }
 337
 338         if (is_qebsm(q)) {
 339                 schid = q->irq_ptr->sch_token;
 340                 fc |= QDIO_SIGA_QEBSM_FLAG;
 341         }
 342 again:
 343         cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
 344
 345         /* hipersocket busy condition */
 346         if (unlikely(*busy_bit)) {
 347                 retries++;
 348
 349                 if (!start_time) {
 350                         start_time = get_tod_clock_fast();
 351                         goto again;
 352                 }
 353                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 354                         goto again;
 355         }
 356         if (retries) {
 357                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 358                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 359                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 360         }
 361         return cc;
 362 }
 363
 364 static inline int qdio_siga_input(struct qdio_q *q)
 365 {
 366         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 367         unsigned int fc = QDIO_SIGA_READ;
 368         int cc;
 369
 370         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 371         qperf_inc(q, siga_read);
 372
 373         if (is_qebsm(q)) {
 374                 schid = q->irq_ptr->sch_token;
 375                 fc |= QDIO_SIGA_QEBSM_FLAG;
 376         }
 377
 378         cc = do_siga_input(schid, q->mask, fc);
 379         if (unlikely(cc))
 380                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 381         return (cc) ? -EIO : 0;
 382 }
 383
 384 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 385                         unsigned char *state)
 386 {
 387         if (qdio_need_siga_sync(q->irq_ptr))
 388                 qdio_siga_sync_q(q);
 389         return get_buf_state(q, bufnr, state, 0);
 390 }
 391
 392 static inline void qdio_stop_polling(struct qdio_q *q)
 393 {
 394         if (!q->u.in.batch_count)
 395                 return;
 396
 397         qperf_inc(q, stop_polling);
 398
 399         /* show the card that we are not polling anymore */
 400         set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
 401                        q->u.in.batch_count);
 402         q->u.in.batch_count = 0;
 403 }
 404
 405 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 406 {
 407         q->q_stats.nr_sbal_total += count;
 408         q->q_stats.nr_sbals[ilog2(count)]++;
 409 }
 410
 411 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 412                                  int count)
 413 {
 414         /* special handling for no target buffer empty */
 415         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 416             q->sbal[start]->element[15].sflags == 0x10) {
 417                 qperf_inc(q, target_full);
 418                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 419                 return;
 420         }
 421
 422         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 423         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 424         DBF_ERROR("FTC:%3d C:%3d", start, count);
 425         DBF_ERROR("F14:%2x F15:%2x",
 426                   q->sbal[start]->element[14].sflags,
 427                   q->sbal[start]->element[15].sflags);
 428 }
 429
 430 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
 431                                        int count, bool auto_ack)
 432 {
 433         /* ACK the newest SBAL: */
 434         if (!auto_ack)
 435                 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
 436
 437         if (!q->u.in.batch_count)
 438                 q->u.in.batch_start = start;
 439         q->u.in.batch_count += count;
 440 }
 441
 442 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start,
 443                                        unsigned int *error)
 444 {
 445         unsigned char state = 0;
 446         int count;
 447
 448         q->timestamp = get_tod_clock_fast();
 449
 450         count = atomic_read(&q->nr_buf_used);
 451         if (!count)
 452                 return 0;
 453
 454         if (qdio_need_siga_sync(q->irq_ptr))
 455                 qdio_sync_input_queue(q);
 456
 457         count = get_buf_states(q, start, &state, count, 1);
 458         if (!count)
 459                 return 0;
 460
 461         switch (state) {
 462         case SLSB_P_INPUT_PRIMED:
 463                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
 464                               count);
 465
 466                 inbound_handle_work(q, start, count, is_qebsm(q));
 467                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 468                         qperf_inc(q, inbound_queue_full);
 469                 if (q->irq_ptr->perf_stat_enabled)
 470                         account_sbals(q, count);
 471                 return count;
 472         case SLSB_P_INPUT_ERROR:
 473                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
 474                               count);
 475
 476                 *error = QDIO_ERROR_SLSB_STATE;
 477                 process_buffer_error(q, start, count);
 478                 inbound_handle_work(q, start, count, false);
 479                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 480                         qperf_inc(q, inbound_queue_full);
 481                 if (q->irq_ptr->perf_stat_enabled)
 482                         account_sbals_error(q, count);
 483                 return count;
 484         case SLSB_CU_INPUT_EMPTY:
 485                 if (q->irq_ptr->perf_stat_enabled)
 486                         q->q_stats.nr_sbal_nop++;
 487                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 488                               q->nr, start);
 489                 return 0;
 490         case SLSB_P_INPUT_NOT_INIT:
 491         case SLSB_P_INPUT_ACK:
 492                 /* We should never see this state, throw a WARN: */
 493         default:
 494                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 495                               "found state %#x at index %u on queue %u\n",
 496                               state, start, q->nr);
 497                 return 0;
 498         }
 499 }
 500
 501 int qdio_inspect_input_queue(struct ccw_device *cdev, unsigned int nr,
 502                              unsigned int *bufnr, unsigned int *error)
 503 {
 504         struct qdio_irq *irq = cdev->private->qdio_data;
 505         unsigned int start;
 506         struct qdio_q *q;
 507         int count;
 508
 509         if (!irq)
 510                 return -ENODEV;
 511
 512         q = irq->input_qs[nr];
 513         start = q->first_to_check;
 514         *error = 0;
 515
 516         count = get_inbound_buffer_frontier(q, start, error);
 517         if (count == 0)
 518                 return 0;
 519
 520         *bufnr = start;
 521         q->first_to_check = add_buf(start, count);
 522         return count;
 523 }
 524 EXPORT_SYMBOL_GPL(qdio_inspect_input_queue);
 525
 526 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 527 {
 528         unsigned char state = 0;
 529
 530         if (!atomic_read(&q->nr_buf_used))
 531                 return 1;
 532
 533         if (qdio_need_siga_sync(q->irq_ptr))
 534                 qdio_sync_input_queue(q);
 535         get_buf_state(q, start, &state, 0);
 536
 537         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 538                 /* more work coming */
 539                 return 0;
 540
 541         return 1;
 542 }
 543
 544 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start,
 545                                         unsigned int *error)
 546 {
 547         unsigned char state = 0;
 548         int count;
 549
 550         q->timestamp = get_tod_clock_fast();
 551
 552         count = atomic_read(&q->nr_buf_used);
 553         if (!count)
 554                 return 0;
 555
 556         if (qdio_need_siga_sync(q->irq_ptr))
 557                 qdio_sync_output_queue(q);
 558
 559         count = get_buf_states(q, start, &state, count, 0);
 560         if (!count)
 561                 return 0;
 562
 563         switch (state) {
 564         case SLSB_P_OUTPUT_PENDING:
 565                 *error = QDIO_ERROR_SLSB_PENDING;
 566                 fallthrough;
 567         case SLSB_P_OUTPUT_EMPTY:
 568                 /* the adapter got it */
 569                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 570                         "out empty:%1d %02x", q->nr, count);
 571
 572                 atomic_sub(count, &q->nr_buf_used);
 573                 if (q->irq_ptr->perf_stat_enabled)
 574                         account_sbals(q, count);
 575                 return count;
 576         case SLSB_P_OUTPUT_ERROR:
 577                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out error:%1d %02x",
 578                               q->nr, count);
 579
 580                 *error = QDIO_ERROR_SLSB_STATE;
 581                 process_buffer_error(q, start, count);
 582                 atomic_sub(count, &q->nr_buf_used);
 583                 if (q->irq_ptr->perf_stat_enabled)
 584                         account_sbals_error(q, count);
 585                 return count;
 586         case SLSB_CU_OUTPUT_PRIMED:
 587                 /* the adapter has not fetched the output yet */
 588                 if (q->irq_ptr->perf_stat_enabled)
 589                         q->q_stats.nr_sbal_nop++;
 590                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 591                               q->nr);
 592                 return 0;
 593         case SLSB_P_OUTPUT_HALTED:
 594                 return 0;
 595         case SLSB_P_OUTPUT_NOT_INIT:
 596                 /* We should never see this state, throw a WARN: */
 597         default:
 598                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 599                               "found state %#x at index %u on queue %u\n",
 600                               state, start, q->nr);
 601                 return 0;
 602         }
 603 }
 604
 605 int qdio_inspect_output_queue(struct ccw_device *cdev, unsigned int nr,
 606                               unsigned int *bufnr, unsigned int *error)
 607 {
 608         struct qdio_irq *irq = cdev->private->qdio_data;
 609         unsigned int start;
 610         struct qdio_q *q;
 611         int count;
 612
 613         if (!irq)
 614                 return -ENODEV;
 615
 616         q = irq->output_qs[nr];
 617         start = q->first_to_check;
 618         *error = 0;
 619
 620         count = get_outbound_buffer_frontier(q, start, error);
 621         if (count == 0)
 622                 return 0;
 623
 624         *bufnr = start;
 625         q->first_to_check = add_buf(start, count);
 626         return count;
 627 }
 628 EXPORT_SYMBOL_GPL(qdio_inspect_output_queue);
 629
 630 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 631                                 unsigned long aob)
 632 {
 633         int retries = 0, cc;
 634         unsigned int busy_bit;
 635
 636         if (!qdio_need_siga_out(q->irq_ptr))
 637                 return 0;
 638
 639         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 640 retry:
 641         qperf_inc(q, siga_write);
 642
 643         cc = qdio_siga_output(q, count, &busy_bit, aob);
 644         switch (cc) {
 645         case 0:
 646                 break;
 647         case 2:
 648                 if (busy_bit) {
 649                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 650                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 651                                 goto retry;
 652                         }
 653                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 654                         cc = -EBUSY;
 655                 } else {
 656                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 657                         cc = -ENOBUFS;
 658                 }
 659                 break;
 660         case 1:
 661         case 3:
 662                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 663                 cc = -EIO;
 664                 break;
 665         }
 666         if (retries) {
 667                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 668                 DBF_ERROR("count:%u", retries);
 669         }
 670         return cc;
 671 }
 672
 673 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 674                                   enum qdio_irq_states state)
 675 {
 676         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 677
 678         irq_ptr->state = state;
 679         mb();
 680 }
 681
 682 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 683 {
 684         if (irb->esw.esw0.erw.cons) {
 685                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 686                 DBF_ERROR_HEX(irb, 64);
 687                 DBF_ERROR_HEX(irb->ecw, 64);
 688         }
 689 }
 690
 691 /* PCI interrupt handler */
 692 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 693 {
 694         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 695                 return;
 696
 697         qdio_deliver_irq(irq_ptr);
 698         irq_ptr->last_data_irq_time = S390_lowcore.int_clock;
 699 }
 700
 701 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
 702                                        unsigned long intparm, int cstat,
 703                                        int dstat)
 704 {
 705         unsigned int first_to_check = 0;
 706
 707         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 708         DBF_ERROR("intp :%lx", intparm);
 709         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 710
 711         /* zfcp wants this: */
 712         if (irq_ptr->nr_input_qs)
 713                 first_to_check = irq_ptr->input_qs[0]->first_to_check;
 714
 715         irq_ptr->error_handler(irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 0,
 716                                first_to_check, 0, irq_ptr->int_parm);
 717         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 718         /*
 719          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 720          * Therefore we call the LGR detection function here.
 721          */
 722         lgr_info_log();
 723 }
 724
 725 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
 726                                       int dstat)
 727 {
 728         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 729
 730         if (cstat)
 731                 goto error;
 732         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 733                 goto error;
 734         if (!(dstat & DEV_STAT_DEV_END))
 735                 goto error;
 736         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 737         return;
 738
 739 error:
 740         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 741         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 742         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 743 }
 744
 745 /* qdio interrupt handler */
 746 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 747                       struct irb *irb)
 748 {
 749         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 750         struct subchannel_id schid;
 751         int cstat, dstat;
 752
 753         if (!intparm || !irq_ptr) {
 754                 ccw_device_get_schid(cdev, &schid);
 755                 DBF_ERROR("qint:%4x", schid.sch_no);
 756                 return;
 757         }
 758
 759         if (irq_ptr->perf_stat_enabled)
 760                 irq_ptr->perf_stat.qdio_int++;
 761
 762         if (IS_ERR(irb)) {
 763                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 764                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 765                 wake_up(&cdev->private->wait_q);
 766                 return;
 767         }
 768         qdio_irq_check_sense(irq_ptr, irb);
 769         cstat = irb->scsw.cmd.cstat;
 770         dstat = irb->scsw.cmd.dstat;
 771
 772         switch (irq_ptr->state) {
 773         case QDIO_IRQ_STATE_INACTIVE:
 774                 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
 775                 break;
 776         case QDIO_IRQ_STATE_CLEANUP:
 777                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 778                 break;
 779         case QDIO_IRQ_STATE_ESTABLISHED:
 780         case QDIO_IRQ_STATE_ACTIVE:
 781                 if (cstat & SCHN_STAT_PCI) {
 782                         qdio_int_handler_pci(irq_ptr);
 783                         return;
 784                 }
 785                 if (cstat || dstat)
 786                         qdio_handle_activate_check(irq_ptr, intparm, cstat,
 787                                                    dstat);
 788                 break;
 789         case QDIO_IRQ_STATE_STOPPED:
 790                 break;
 791         default:
 792                 WARN_ON_ONCE(1);
 793         }
 794         wake_up(&cdev->private->wait_q);
 795 }
 796
 797 /**
 798  * qdio_get_ssqd_desc - get qdio subchannel description
 799  * @cdev: ccw device to get description for
 800  * @data: where to store the ssqd
 801  *
 802  * Returns 0 or an error code. The results of the chsc are stored in the
 803  * specified structure.
 804  */
 805 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 806                        struct qdio_ssqd_desc *data)
 807 {
 808         struct subchannel_id schid;
 809
 810         if (!cdev || !cdev->private)
 811                 return -EINVAL;
 812
 813         ccw_device_get_schid(cdev, &schid);
 814         DBF_EVENT("get ssqd:%4x", schid.sch_no);
 815         return qdio_setup_get_ssqd(NULL, &schid, data);
 816 }
 817 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 818
 819 static int qdio_cancel_ccw(struct qdio_irq *irq, int how)
 820 {
 821         struct ccw_device *cdev = irq->cdev;
 822         long timeout;
 823         int rc;
 824
 825         spin_lock_irq(get_ccwdev_lock(cdev));
 826         qdio_set_state(irq, QDIO_IRQ_STATE_CLEANUP);
 827         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
 828                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
 829         else
 830                 /* default behaviour is halt */
 831                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
 832         spin_unlock_irq(get_ccwdev_lock(cdev));
 833         if (rc) {
 834                 DBF_ERROR("%4x SHUTD ERR", irq->schid.sch_no);
 835                 DBF_ERROR("rc:%4d", rc);
 836                 return rc;
 837         }
 838
 839         timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
 840                                                    irq->state == QDIO_IRQ_STATE_INACTIVE ||
 841                                                    irq->state == QDIO_IRQ_STATE_ERR,
 842                                                    10 * HZ);
 843         if (timeout <= 0)
 844                 rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
 845
 846         return rc;
 847 }
 848
 849 /**
 850  * qdio_shutdown - shut down a qdio subchannel
 851  * @cdev: associated ccw device
 852  * @how: use halt or clear to shutdown
 853  */
 854 int qdio_shutdown(struct ccw_device *cdev, int how)
 855 {
 856         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 857         struct subchannel_id schid;
 858         int rc;
 859
 860         if (!irq_ptr)
 861                 return -ENODEV;
 862
 863         WARN_ON_ONCE(irqs_disabled());
 864         ccw_device_get_schid(cdev, &schid);
 865         DBF_EVENT("qshutdown:%4x", schid.sch_no);
 866
 867         mutex_lock(&irq_ptr->setup_mutex);
 868         /*
 869          * Subchannel was already shot down. We cannot prevent being called
 870          * twice since cio may trigger a shutdown asynchronously.
 871          */
 872         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
 873                 mutex_unlock(&irq_ptr->setup_mutex);
 874                 return 0;
 875         }
 876
 877         /*
 878          * Indicate that the device is going down.
 879          */
 880         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 881
 882         qdio_shutdown_debug_entries(irq_ptr);
 883
 884         rc = qdio_cancel_ccw(irq_ptr, how);
 885         qdio_shutdown_thinint(irq_ptr);
 886         qdio_shutdown_irq(irq_ptr);
 887
 888         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 889         mutex_unlock(&irq_ptr->setup_mutex);
 890         if (rc)
 891                 return rc;
 892         return 0;
 893 }
 894 EXPORT_SYMBOL_GPL(qdio_shutdown);
 895
 896 /**
 897  * qdio_free - free data structures for a qdio subchannel
 898  * @cdev: associated ccw device
 899  */
 900 int qdio_free(struct ccw_device *cdev)
 901 {
 902         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 903         struct subchannel_id schid;
 904
 905         if (!irq_ptr)
 906                 return -ENODEV;
 907
 908         ccw_device_get_schid(cdev, &schid);
 909         DBF_EVENT("qfree:%4x", schid.sch_no);
 910         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
 911         mutex_lock(&irq_ptr->setup_mutex);
 912
 913         irq_ptr->debug_area = NULL;
 914         cdev->private->qdio_data = NULL;
 915         mutex_unlock(&irq_ptr->setup_mutex);
 916
 917         qdio_free_queues(irq_ptr);
 918         free_page((unsigned long) irq_ptr->qdr);
 919         free_page(irq_ptr->chsc_page);
 920         kfree(irq_ptr->ccw);
 921         free_page((unsigned long) irq_ptr);
 922         return 0;
 923 }
 924 EXPORT_SYMBOL_GPL(qdio_free);
 925
 926 /**
 927  * qdio_allocate - allocate qdio queues and associated data
 928  * @cdev: associated ccw device
 929  * @no_input_qs: allocate this number of Input Queues
 930  * @no_output_qs: allocate this number of Output Queues
 931  */
 932 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
 933                   unsigned int no_output_qs)
 934 {
 935         struct subchannel_id schid;
 936         struct qdio_irq *irq_ptr;
 937         int rc = -ENOMEM;
 938
 939         ccw_device_get_schid(cdev, &schid);
 940         DBF_EVENT("qallocate:%4x", schid.sch_no);
 941
 942         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
 943             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
 944                 return -EINVAL;
 945
 946         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL);
 947         if (!irq_ptr)
 948                 return -ENOMEM;
 949
 950         irq_ptr->ccw = kmalloc(sizeof(*irq_ptr->ccw), GFP_KERNEL | GFP_DMA);
 951         if (!irq_ptr->ccw)
 952                 goto err_ccw;
 953
 954         /* kmemleak doesn't scan the page-allocated irq_ptr: */
 955         kmemleak_not_leak(irq_ptr->ccw);
 956
 957         irq_ptr->cdev = cdev;
 958         mutex_init(&irq_ptr->setup_mutex);
 959         if (qdio_allocate_dbf(irq_ptr))
 960                 goto err_dbf;
 961
 962         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
 963                       no_output_qs);
 964
 965         /*
 966          * Allocate a page for the chsc calls in qdio_establish.
 967          * Must be pre-allocated since a zfcp recovery will call
 968          * qdio_establish. In case of low memory and swap on a zfcp disk
 969          * we may not be able to allocate memory otherwise.
 970          */
 971         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
 972         if (!irq_ptr->chsc_page)
 973                 goto err_chsc;
 974
 975         /* qdr is used in ccw1.cda which is u32 */
 976         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 977         if (!irq_ptr->qdr)
 978                 goto err_qdr;
 979
 980         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
 981         if (rc)
 982                 goto err_queues;
 983
 984         cdev->private->qdio_data = irq_ptr;
 985         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 986         return 0;
 987
 988 err_queues:
 989         free_page((unsigned long) irq_ptr->qdr);
 990 err_qdr:
 991         free_page(irq_ptr->chsc_page);
 992 err_chsc:
 993 err_dbf:
 994         kfree(irq_ptr->ccw);
 995 err_ccw:
 996         free_page((unsigned long) irq_ptr);
 997         return rc;
 998 }
 999 EXPORT_SYMBOL_GPL(qdio_allocate);
1000
1001 static void qdio_trace_init_data(struct qdio_irq *irq,
1002                                  struct qdio_initialize *data)
1003 {
1004         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1005         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1006         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1007         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1008                       data->no_output_qs);
1009         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1010         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1011         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1012         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1013         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1014                     DBF_ERR);
1015 }
1016
1017 /**
1018  * qdio_establish - establish queues on a qdio subchannel
1019  * @cdev: associated ccw device
1020  * @init_data: initialization data
1021  */
1022 int qdio_establish(struct ccw_device *cdev,
1023                    struct qdio_initialize *init_data)
1024 {
1025         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1026         struct subchannel_id schid;
1027         struct ciw *ciw;
1028         long timeout;
1029         int rc;
1030
1031         ccw_device_get_schid(cdev, &schid);
1032         DBF_EVENT("qestablish:%4x", schid.sch_no);
1033
1034         if (!irq_ptr)
1035                 return -ENODEV;
1036
1037         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1038             init_data->no_output_qs > irq_ptr->max_output_qs)
1039                 return -EINVAL;
1040
1041         /* Needed as error_handler: */
1042         if (!init_data->input_handler)
1043                 return -EINVAL;
1044
1045         if (init_data->no_output_qs && !init_data->output_handler)
1046                 return -EINVAL;
1047
1048         if (!init_data->input_sbal_addr_array ||
1049             !init_data->output_sbal_addr_array)
1050                 return -EINVAL;
1051
1052         if (!init_data->irq_poll)
1053                 return -EINVAL;
1054
1055         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
1056         if (!ciw) {
1057                 DBF_ERROR("%4x NO EQ", schid.sch_no);
1058                 return -EIO;
1059         }
1060
1061         mutex_lock(&irq_ptr->setup_mutex);
1062         qdio_trace_init_data(irq_ptr, init_data);
1063         qdio_setup_irq(irq_ptr, init_data);
1064
1065         rc = qdio_establish_thinint(irq_ptr);
1066         if (rc)
1067                 goto err_thinint;
1068
1069         /* establish q */
1070         irq_ptr->ccw->cmd_code = ciw->cmd;
1071         irq_ptr->ccw->flags = CCW_FLAG_SLI;
1072         irq_ptr->ccw->count = ciw->count;
1073         irq_ptr->ccw->cda = (u32) virt_to_phys(irq_ptr->qdr);
1074
1075         spin_lock_irq(get_ccwdev_lock(cdev));
1076         ccw_device_set_options_mask(cdev, 0);
1077
1078         rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1079         spin_unlock_irq(get_ccwdev_lock(cdev));
1080         if (rc) {
1081                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1082                 DBF_ERROR("rc:%4x", rc);
1083                 goto err_ccw_start;
1084         }
1085
1086         timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
1087                                                    irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1088                                                    irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1089         if (timeout <= 0) {
1090                 rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
1091                 goto err_ccw_timeout;
1092         }
1093
1094         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1095                 rc = -EIO;
1096                 goto err_ccw_error;
1097         }
1098
1099         qdio_setup_ssqd_info(irq_ptr);
1100
1101         /* qebsm is now setup if available, initialize buffer states */
1102         qdio_init_buf_states(irq_ptr);
1103
1104         mutex_unlock(&irq_ptr->setup_mutex);
1105         qdio_print_subchannel_info(irq_ptr);
1106         qdio_setup_debug_entries(irq_ptr);
1107         return 0;
1108
1109 err_ccw_timeout:
1110         qdio_cancel_ccw(irq_ptr, QDIO_FLAG_CLEANUP_USING_CLEAR);
1111 err_ccw_error:
1112 err_ccw_start:
1113         qdio_shutdown_thinint(irq_ptr);
1114 err_thinint:
1115         qdio_shutdown_irq(irq_ptr);
1116         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1117         mutex_unlock(&irq_ptr->setup_mutex);
1118         return rc;
1119 }
1120 EXPORT_SYMBOL_GPL(qdio_establish);
1121
1122 /**
1123  * qdio_activate - activate queues on a qdio subchannel
1124  * @cdev: associated cdev
1125  */
1126 int qdio_activate(struct ccw_device *cdev)
1127 {
1128         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1129         struct subchannel_id schid;
1130         struct ciw *ciw;
1131         int rc;
1132
1133         ccw_device_get_schid(cdev, &schid);
1134         DBF_EVENT("qactivate:%4x", schid.sch_no);
1135
1136         if (!irq_ptr)
1137                 return -ENODEV;
1138
1139         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
1140         if (!ciw) {
1141                 DBF_ERROR("%4x NO AQ", schid.sch_no);
1142                 return -EIO;
1143         }
1144
1145         mutex_lock(&irq_ptr->setup_mutex);
1146         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1147                 rc = -EBUSY;
1148                 goto out;
1149         }
1150
1151         irq_ptr->ccw->cmd_code = ciw->cmd;
1152         irq_ptr->ccw->flags = CCW_FLAG_SLI;
1153         irq_ptr->ccw->count = ciw->count;
1154         irq_ptr->ccw->cda = 0;
1155
1156         spin_lock_irq(get_ccwdev_lock(cdev));
1157         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1158
1159         rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1160                               0, DOIO_DENY_PREFETCH);
1161         spin_unlock_irq(get_ccwdev_lock(cdev));
1162         if (rc) {
1163                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1164                 DBF_ERROR("rc:%4x", rc);
1165                 goto out;
1166         }
1167
1168         /* wait for subchannel to become active */
1169         msleep(5);
1170
1171         switch (irq_ptr->state) {
1172         case QDIO_IRQ_STATE_STOPPED:
1173         case QDIO_IRQ_STATE_ERR:
1174                 rc = -EIO;
1175                 break;
1176         default:
1177                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1178                 rc = 0;
1179         }
1180 out:
1181         mutex_unlock(&irq_ptr->setup_mutex);
1182         return rc;
1183 }
1184 EXPORT_SYMBOL_GPL(qdio_activate);
1185
1186 /**
1187  * handle_inbound - reset processed input buffers
1188  * @q: queue containing the buffers
1189  * @bufnr: first buffer to process
1190  * @count: how many buffers are emptied
1191  */
1192 static int handle_inbound(struct qdio_q *q, int bufnr, int count)
1193 {
1194         int overlap;
1195
1196         qperf_inc(q, inbound_call);
1197
1198         /* If any processed SBALs are returned to HW, adjust our tracking: */
1199         overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1200                              q->u.in.batch_count);
1201         if (overlap > 0) {
1202                 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1203                 q->u.in.batch_count -= overlap;
1204         }
1205
1206         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1207         atomic_add(count, &q->nr_buf_used);
1208
1209         if (qdio_need_siga_in(q->irq_ptr))
1210                 return qdio_siga_input(q);
1211
1212         return 0;
1213 }
1214
1215 /**
1216  * qdio_add_bufs_to_input_queue - process buffers on an Input Queue
1217  * @cdev: associated ccw_device for the qdio subchannel
1218  * @q_nr: queue number
1219  * @bufnr: buffer number
1220  * @count: how many buffers to process
1221  */
1222 int qdio_add_bufs_to_input_queue(struct ccw_device *cdev, unsigned int q_nr,
1223                                  unsigned int bufnr, unsigned int count)
1224 {
1225         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1226
1227         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1228                 return -EINVAL;
1229
1230         if (!irq_ptr)
1231                 return -ENODEV;
1232
1233         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addi b:%02x c:%02x", bufnr, count);
1234
1235         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1236                 return -EIO;
1237         if (!count)
1238                 return 0;
1239
1240         return handle_inbound(irq_ptr->input_qs[q_nr], bufnr, count);
1241 }
1242 EXPORT_SYMBOL_GPL(qdio_add_bufs_to_input_queue);
1243
1244 /**
1245  * handle_outbound - process filled outbound buffers
1246  * @q: queue containing the buffers
1247  * @bufnr: first buffer to process
1248  * @count: how many buffers are filled
1249  * @aob: asynchronous operation block
1250  */
1251 static int handle_outbound(struct qdio_q *q, unsigned int bufnr, unsigned int count,
1252                            struct qaob *aob)
1253 {
1254         unsigned char state = 0;
1255         int used, rc = 0;
1256
1257         qperf_inc(q, outbound_call);
1258
1259         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1260         used = atomic_add_return(count, &q->nr_buf_used);
1261
1262         if (used == QDIO_MAX_BUFFERS_PER_Q)
1263                 qperf_inc(q, outbound_queue_full);
1264
1265         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1266                 unsigned long phys_aob = aob ? virt_to_phys(aob) : 0;
1267
1268                 WARN_ON_ONCE(!IS_ALIGNED(phys_aob, 256));
1269                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1270         } else if (qdio_need_siga_sync(q->irq_ptr)) {
1271                 rc = qdio_sync_output_queue(q);
1272         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1273                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1274                    state == SLSB_CU_OUTPUT_PRIMED) {
1275                 /* The previous buffer is not processed yet, tack on. */
1276                 qperf_inc(q, fast_requeue);
1277         } else {
1278                 rc = qdio_kick_outbound_q(q, count, 0);
1279         }
1280
1281         return rc;
1282 }
1283
1284 /**
1285  * qdio_add_bufs_to_output_queue - process buffers on an Output Queue
1286  * @cdev: associated ccw_device for the qdio subchannel
1287  * @q_nr: queue number
1288  * @bufnr: buffer number
1289  * @count: how many buffers to process
1290  * @aob: asynchronous operation block
1291  */
1292 int qdio_add_bufs_to_output_queue(struct ccw_device *cdev, unsigned int q_nr,
1293                                   unsigned int bufnr, unsigned int count,
1294                                   struct qaob *aob)
1295 {
1296         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1297
1298         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1299                 return -EINVAL;
1300
1301         if (!irq_ptr)
1302                 return -ENODEV;
1303
1304         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addo b:%02x c:%02x", bufnr, count);
1305
1306         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1307                 return -EIO;
1308         if (!count)
1309                 return 0;
1310
1311         return handle_outbound(irq_ptr->output_qs[q_nr], bufnr, count, aob);
1312 }
1313 EXPORT_SYMBOL_GPL(qdio_add_bufs_to_output_queue);
1314
1315 /**
1316  * qdio_start_irq - enable interrupt processing for the device
1317  * @cdev: associated ccw_device for the qdio subchannel
1318  *
1319  * Return codes
1320  *   0 - success
1321  *   1 - irqs not started since new data is available
1322  */
1323 int qdio_start_irq(struct ccw_device *cdev)
1324 {
1325         struct qdio_q *q;
1326         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1327         unsigned int i;
1328
1329         if (!irq_ptr)
1330                 return -ENODEV;
1331
1332         for_each_input_queue(irq_ptr, q, i)
1333                 qdio_stop_polling(q);
1334
1335         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1336
1337         /*
1338          * We need to check again to not lose initiative after
1339          * resetting the ACK state.
1340          */
1341         if (test_nonshared_ind(irq_ptr))
1342                 goto rescan;
1343
1344         for_each_input_queue(irq_ptr, q, i) {
1345                 if (!qdio_inbound_q_done(q, q->first_to_check))
1346                         goto rescan;
1347         }
1348
1349         return 0;
1350
1351 rescan:
1352         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1353                 return 0;
1354         else
1355                 return 1;
1356
1357 }
1358 EXPORT_SYMBOL(qdio_start_irq);
1359
1360 /**
1361  * qdio_stop_irq - disable interrupt processing for the device
1362  * @cdev: associated ccw_device for the qdio subchannel
1363  *
1364  * Return codes
1365  *   0 - interrupts were already disabled
1366  *   1 - interrupts successfully disabled
1367  */
1368 int qdio_stop_irq(struct ccw_device *cdev)
1369 {
1370         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1371
1372         if (!irq_ptr)
1373                 return -ENODEV;
1374
1375         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1376                 return 0;
1377         else
1378                 return 1;
1379 }
1380 EXPORT_SYMBOL(qdio_stop_irq);
1381
1382 static int __init init_QDIO(void)
1383 {
1384         int rc;
1385
1386         rc = qdio_debug_init();
1387         if (rc)
1388                 return rc;
1389         rc = qdio_setup_init();
1390         if (rc)
1391                 goto out_debug;
1392         rc = qdio_thinint_init();
1393         if (rc)
1394                 goto out_cache;
1395         return 0;
1396
1397 out_cache:
1398         qdio_setup_exit();
1399 out_debug:
1400         qdio_debug_exit();
1401         return rc;
1402 }
1403
1404 static void __exit exit_QDIO(void)
1405 {
1406         qdio_thinint_exit();
1407         qdio_setup_exit();
1408         qdio_debug_exit();
1409 }
1410
1411 module_init(init_QDIO);
1412 module_exit(exit_QDIO);