drivers/s390/cio/qdio_setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * qdio queue initialization
   4  *
   5  * Copyright IBM Corp. 2008
   6  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/slab.h>
  10 #include <linux/export.h>
  11 #include <linux/io.h>
  12
  13 #include <asm/ebcdic.h>
  14 #include <asm/qdio.h>
  15
  16 #include "cio.h"
  17 #include "css.h"
  18 #include "device.h"
  19 #include "ioasm.h"
  20 #include "chsc.h"
  21 #include "qdio.h"
  22 #include "qdio_debug.h"
  23
  24 #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
  25
  26 static struct kmem_cache *qdio_q_cache;
  27 static struct kmem_cache *qdio_aob_cache;
  28
  29 struct qaob *qdio_allocate_aob(void)
  30 {
  31         return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
  32 }
  33
  34 void qdio_release_aob(struct qaob *aob)
  35 {
  36         kmem_cache_free(qdio_aob_cache, aob);
  37 }
  38 EXPORT_SYMBOL_GPL(qdio_release_aob);
  39
  40 /**
  41  * qdio_free_buffers() - free qdio buffers
  42  * @buf: array of pointers to qdio buffers
  43  * @count: number of qdio buffers to free
  44  */
  45 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
  46 {
  47         int pos;
  48
  49         for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
  50                 free_page((unsigned long) buf[pos]);
  51 }
  52 EXPORT_SYMBOL_GPL(qdio_free_buffers);
  53
  54 /**
  55  * qdio_alloc_buffers() - allocate qdio buffers
  56  * @buf: array of pointers to qdio buffers
  57  * @count: number of qdio buffers to allocate
  58  */
  59 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
  60 {
  61         int pos;
  62
  63         for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
  64                 buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
  65                 if (!buf[pos]) {
  66                         qdio_free_buffers(buf, count);
  67                         return -ENOMEM;
  68                 }
  69         }
  70         for (pos = 0; pos < count; pos++)
  71                 if (pos % QBUFF_PER_PAGE)
  72                         buf[pos] = buf[pos - 1] + 1;
  73         return 0;
  74 }
  75 EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
  76
  77 /**
  78  * qdio_reset_buffers() - reset qdio buffers
  79  * @buf: array of pointers to qdio buffers
  80  * @count: number of qdio buffers that will be zeroed
  81  */
  82 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
  83 {
  84         int pos;
  85
  86         for (pos = 0; pos < count; pos++)
  87                 memset(buf[pos], 0, sizeof(struct qdio_buffer));
  88 }
  89 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
  90
  91 /*
  92  * qebsm is only available under 64bit but the adapter sets the feature
  93  * flag anyway, so we manually override it.
  94  */
  95 static inline int qebsm_possible(void)
  96 {
  97         return css_general_characteristics.qebsm;
  98 }
  99
 100 /*
 101  * qib_param_field: pointer to 128 bytes or NULL, if no param field
 102  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
 103  */
 104 static void set_impl_params(struct qdio_irq *irq_ptr,
 105                             unsigned int qib_param_field_format,
 106                             unsigned char *qib_param_field,
 107                             unsigned long *input_slib_elements,
 108                             unsigned long *output_slib_elements)
 109 {
 110         struct qdio_q *q;
 111         int i, j;
 112
 113         if (!irq_ptr)
 114                 return;
 115
 116         irq_ptr->qib.pfmt = qib_param_field_format;
 117         if (qib_param_field)
 118                 memcpy(irq_ptr->qib.parm, qib_param_field,
 119                        sizeof(irq_ptr->qib.parm));
 120
 121         if (!input_slib_elements)
 122                 goto output;
 123
 124         for_each_input_queue(irq_ptr, q, i) {
 125                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 126                         q->slib->slibe[j].parms =
 127                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
 128         }
 129 output:
 130         if (!output_slib_elements)
 131                 return;
 132
 133         for_each_output_queue(irq_ptr, q, i) {
 134                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 135                         q->slib->slibe[j].parms =
 136                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
 137         }
 138 }
 139
 140 static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
 141 {
 142         struct qdio_q *q;
 143         unsigned int i;
 144
 145         for (i = 0; i < count; i++) {
 146                 q = queues[i];
 147                 free_page((unsigned long) q->slib);
 148                 kmem_cache_free(qdio_q_cache, q);
 149         }
 150 }
 151
 152 void qdio_free_queues(struct qdio_irq *irq_ptr)
 153 {
 154         __qdio_free_queues(irq_ptr->input_qs, irq_ptr->max_input_qs);
 155         irq_ptr->max_input_qs = 0;
 156
 157         __qdio_free_queues(irq_ptr->output_qs, irq_ptr->max_output_qs);
 158         irq_ptr->max_output_qs = 0;
 159 }
 160
 161 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
 162 {
 163         struct qdio_q *q;
 164         int i;
 165
 166         for (i = 0; i < nr_queues; i++) {
 167                 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
 168                 if (!q) {
 169                         __qdio_free_queues(irq_ptr_qs, i);
 170                         return -ENOMEM;
 171                 }
 172
 173                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
 174                 if (!q->slib) {
 175                         kmem_cache_free(qdio_q_cache, q);
 176                         __qdio_free_queues(irq_ptr_qs, i);
 177                         return -ENOMEM;
 178                 }
 179                 irq_ptr_qs[i] = q;
 180         }
 181         return 0;
 182 }
 183
 184 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 185 {
 186         int rc;
 187
 188         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 189         if (rc)
 190                 return rc;
 191
 192         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 193         if (rc) {
 194                 __qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
 195                 return rc;
 196         }
 197
 198         irq_ptr->max_input_qs = nr_input_qs;
 199         irq_ptr->max_output_qs = nr_output_qs;
 200         return 0;
 201 }
 202
 203 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 204                               qdio_handler_t *handler, int i)
 205 {
 206         struct slib *slib = q->slib;
 207
 208         /* queue must be cleared for qdio_establish */
 209         memset(q, 0, sizeof(*q));
 210         memset(slib, 0, PAGE_SIZE);
 211         q->slib = slib;
 212         q->irq_ptr = irq_ptr;
 213         q->mask = 1 << (31 - i);
 214         q->nr = i;
 215         q->handler = handler;
 216 }
 217
 218 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 219                                 struct qdio_buffer **sbals_array, int i)
 220 {
 221         struct qdio_q *prev;
 222         int j;
 223
 224         DBF_HEX(&q, sizeof(void *));
 225         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 226
 227         /* fill in sbal */
 228         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 229                 q->sbal[j] = *sbals_array++;
 230
 231         /* fill in slib */
 232         if (i > 0) {
 233                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 234                         : irq_ptr->output_qs[i - 1];
 235                 prev->slib->nsliba = (unsigned long)q->slib;
 236         }
 237
 238         q->slib->sla = (unsigned long)q->sl;
 239         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 240
 241         /* fill in sl */
 242         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 243                 q->sl->element[j].sbal = virt_to_phys(q->sbal[j]);
 244 }
 245
 246 static void setup_queues(struct qdio_irq *irq_ptr,
 247                          struct qdio_initialize *qdio_init)
 248 {
 249         struct qdio_q *q;
 250         struct qdio_outbuf_state *output_sbal_state_array =
 251                                   qdio_init->output_sbal_state_array;
 252         int i;
 253
 254         for_each_input_queue(irq_ptr, q, i) {
 255                 DBF_EVENT("inq:%1d", i);
 256                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 257
 258                 q->is_input_q = 1;
 259
 260                 setup_storage_lists(q, irq_ptr,
 261                                     qdio_init->input_sbal_addr_array[i], i);
 262
 263                 if (is_thinint_irq(irq_ptr)) {
 264                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 265                                      (unsigned long) q);
 266                 } else {
 267                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 268                                      (unsigned long) q);
 269                 }
 270         }
 271
 272         for_each_output_queue(irq_ptr, q, i) {
 273                 DBF_EVENT("outq:%1d", i);
 274                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 275
 276                 q->u.out.sbal_state = output_sbal_state_array;
 277                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 278
 279                 q->is_input_q = 0;
 280                 setup_storage_lists(q, irq_ptr,
 281                                     qdio_init->output_sbal_addr_array[i], i);
 282
 283                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 284                              (unsigned long) q);
 285                 timer_setup(&q->u.out.timer, qdio_outbound_timer, 0);
 286         }
 287 }
 288
 289 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 290 {
 291         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 292                 irq_ptr->siga_flag.input = 1;
 293         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 294                 irq_ptr->siga_flag.output = 1;
 295         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 296                 irq_ptr->siga_flag.sync = 1;
 297         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 298                 irq_ptr->siga_flag.sync_after_ai = 1;
 299         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 300                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 301 }
 302
 303 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 304                                   unsigned char qdioac, unsigned long token)
 305 {
 306         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 307                 goto no_qebsm;
 308         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 309             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 310                 goto no_qebsm;
 311
 312         irq_ptr->sch_token = token;
 313
 314         DBF_EVENT("V=V:1");
 315         DBF_EVENT("%8lx", irq_ptr->sch_token);
 316         return;
 317
 318 no_qebsm:
 319         irq_ptr->sch_token = 0;
 320         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 321         DBF_EVENT("noV=V");
 322 }
 323
 324 /*
 325  * If there is a qdio_irq we use the chsc_page and store the information
 326  * in the qdio_irq, otherwise we copy it to the specified structure.
 327  */
 328 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 329                         struct subchannel_id *schid,
 330                         struct qdio_ssqd_desc *data)
 331 {
 332         struct chsc_ssqd_area *ssqd;
 333         int rc;
 334
 335         DBF_EVENT("getssqd:%4x", schid->sch_no);
 336         if (!irq_ptr) {
 337                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 338                 if (!ssqd)
 339                         return -ENOMEM;
 340         } else {
 341                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 342         }
 343
 344         rc = chsc_ssqd(*schid, ssqd);
 345         if (rc)
 346                 goto out;
 347
 348         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 349             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 350             (ssqd->qdio_ssqd.sch != schid->sch_no))
 351                 rc = -EINVAL;
 352
 353         if (!rc)
 354                 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
 355
 356 out:
 357         if (!irq_ptr)
 358                 free_page((unsigned long)ssqd);
 359
 360         return rc;
 361 }
 362
 363 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 364 {
 365         unsigned char qdioac;
 366         int rc;
 367
 368         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
 369         if (rc) {
 370                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 371                 DBF_ERROR("rc:%x", rc);
 372                 /* all flags set, worst case */
 373                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 374                          AC1_SIGA_SYNC_NEEDED;
 375         } else
 376                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 377
 378         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 379         process_ac_flags(irq_ptr, qdioac);
 380         DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
 381         DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
 382 }
 383
 384 void qdio_free_async_data(struct qdio_irq *irq_ptr)
 385 {
 386         struct qdio_q *q;
 387         int i;
 388
 389         for (i = 0; i < irq_ptr->max_output_qs; i++) {
 390                 q = irq_ptr->output_qs[i];
 391                 if (q->u.out.use_cq) {
 392                         unsigned int n;
 393
 394                         for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; n++) {
 395                                 struct qaob *aob = q->u.out.aobs[n];
 396
 397                                 if (aob) {
 398                                         qdio_release_aob(aob);
 399                                         q->u.out.aobs[n] = NULL;
 400                                 }
 401                         }
 402
 403                         qdio_disable_async_operation(&q->u.out);
 404                 }
 405         }
 406 }
 407
 408 static void qdio_fill_qdr_desc(struct qdesfmt0 *desc, struct qdio_q *queue)
 409 {
 410         desc->sliba = virt_to_phys(queue->slib);
 411         desc->sla = virt_to_phys(queue->sl);
 412         desc->slsba = virt_to_phys(&queue->slsb);
 413
 414         desc->akey = PAGE_DEFAULT_KEY >> 4;
 415         desc->bkey = PAGE_DEFAULT_KEY >> 4;
 416         desc->ckey = PAGE_DEFAULT_KEY >> 4;
 417         desc->dkey = PAGE_DEFAULT_KEY >> 4;
 418 }
 419
 420 static void setup_qdr(struct qdio_irq *irq_ptr,
 421                       struct qdio_initialize *qdio_init)
 422 {
 423         struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
 424         int i;
 425
 426         irq_ptr->qdr->qfmt = qdio_init->q_format;
 427         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 428         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 429         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 430         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 431         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 432         irq_ptr->qdr->qiba = virt_to_phys(&irq_ptr->qib);
 433         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 434
 435         for (i = 0; i < qdio_init->no_input_qs; i++)
 436                 qdio_fill_qdr_desc(desc++, irq_ptr->input_qs[i]);
 437
 438         for (i = 0; i < qdio_init->no_output_qs; i++)
 439                 qdio_fill_qdr_desc(desc++, irq_ptr->output_qs[i]);
 440 }
 441
 442 static void setup_qib(struct qdio_irq *irq_ptr,
 443                       struct qdio_initialize *init_data)
 444 {
 445         if (qebsm_possible())
 446                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 447
 448         irq_ptr->qib.rflags |= init_data->qib_rflags;
 449
 450         irq_ptr->qib.qfmt = init_data->q_format;
 451         if (init_data->no_input_qs)
 452                 irq_ptr->qib.isliba =
 453                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 454         if (init_data->no_output_qs)
 455                 irq_ptr->qib.osliba =
 456                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 457         memcpy(irq_ptr->qib.ebcnam, dev_name(&irq_ptr->cdev->dev), 8);
 458         ASCEBC(irq_ptr->qib.ebcnam, 8);
 459 }
 460
 461 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 462 {
 463         struct ccw_device *cdev = irq_ptr->cdev;
 464         struct ciw *ciw;
 465
 466         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 467         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 468         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 469         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 470         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 471
 472         irq_ptr->debugfs_dev = NULL;
 473         irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
 474         irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
 475
 476         /* wipes qib.ac, required by ar7063 */
 477         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 478
 479         irq_ptr->int_parm = init_data->int_parm;
 480         irq_ptr->nr_input_qs = init_data->no_input_qs;
 481         irq_ptr->nr_output_qs = init_data->no_output_qs;
 482         irq_ptr->scan_threshold = init_data->scan_threshold;
 483         ccw_device_get_schid(cdev, &irq_ptr->schid);
 484         setup_queues(irq_ptr, init_data);
 485
 486         if (init_data->irq_poll) {
 487                 irq_ptr->irq_poll = init_data->irq_poll;
 488                 set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
 489         } else {
 490                 irq_ptr->irq_poll = NULL;
 491         }
 492
 493         setup_qib(irq_ptr, init_data);
 494         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 495                         init_data->qib_param_field,
 496                         init_data->input_slib_elements,
 497                         init_data->output_slib_elements);
 498
 499         /* fill input and output descriptors */
 500         setup_qdr(irq_ptr, init_data);
 501
 502         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 503
 504         /* set our IRQ handler */
 505         spin_lock_irq(get_ccwdev_lock(cdev));
 506         irq_ptr->orig_handler = cdev->handler;
 507         cdev->handler = qdio_int_handler;
 508         spin_unlock_irq(get_ccwdev_lock(cdev));
 509
 510         /* get qdio commands */
 511         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
 512         if (!ciw) {
 513                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 514                 return -EINVAL;
 515         }
 516         irq_ptr->equeue = *ciw;
 517
 518         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
 519         if (!ciw) {
 520                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 521                 return -EINVAL;
 522         }
 523         irq_ptr->aqueue = *ciw;
 524
 525         return 0;
 526 }
 527
 528 void qdio_shutdown_irq(struct qdio_irq *irq)
 529 {
 530         struct ccw_device *cdev = irq->cdev;
 531
 532         /* restore IRQ handler */
 533         spin_lock_irq(get_ccwdev_lock(cdev));
 534         cdev->handler = irq->orig_handler;
 535         cdev->private->intparm = 0;
 536         spin_unlock_irq(get_ccwdev_lock(cdev));
 537 }
 538
 539 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
 540 {
 541         char s[80];
 542
 543         snprintf(s, 80, "qdio: %s %s on SC %x using "
 544                  "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 545                  dev_name(&irq_ptr->cdev->dev),
 546                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 547                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 548                  irq_ptr->schid.sch_no,
 549                  is_thinint_irq(irq_ptr),
 550                  (irq_ptr->sch_token) ? 1 : 0,
 551                  pci_out_supported(irq_ptr) ? 1 : 0,
 552                  css_general_characteristics.aif_tdd,
 553                  (irq_ptr->siga_flag.input) ? "R" : " ",
 554                  (irq_ptr->siga_flag.output) ? "W" : " ",
 555                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 556                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 557                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 558         printk(KERN_INFO "%s", s);
 559 }
 560
 561 int qdio_enable_async_operation(struct qdio_output_q *outq)
 562 {
 563         outq->aobs = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *),
 564                              GFP_KERNEL);
 565         if (!outq->aobs) {
 566                 outq->use_cq = 0;
 567                 return -ENOMEM;
 568         }
 569         outq->use_cq = 1;
 570         return 0;
 571 }
 572
 573 void qdio_disable_async_operation(struct qdio_output_q *q)
 574 {
 575         kfree(q->aobs);
 576         q->aobs = NULL;
 577         q->use_cq = 0;
 578 }
 579
 580 int __init qdio_setup_init(void)
 581 {
 582         int rc;
 583
 584         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 585                                          256, 0, NULL);
 586         if (!qdio_q_cache)
 587                 return -ENOMEM;
 588
 589         qdio_aob_cache = kmem_cache_create("qdio_aob",
 590                                         sizeof(struct qaob),
 591                                         sizeof(struct qaob),
 592                                         0,
 593                                         NULL);
 594         if (!qdio_aob_cache) {
 595                 rc = -ENOMEM;
 596                 goto free_qdio_q_cache;
 597         }
 598
 599         /* Check for OSA/FCP thin interrupts (bit 67). */
 600         DBF_EVENT("thinint:%1d",
 601                   (css_general_characteristics.aif_osa) ? 1 : 0);
 602
 603         /* Check for QEBSM support in general (bit 58). */
 604         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 605         rc = 0;
 606 out:
 607         return rc;
 608 free_qdio_q_cache:
 609         kmem_cache_destroy(qdio_q_cache);
 610         goto out;
 611 }
 612
 613 void qdio_setup_exit(void)
 614 {
 615         kmem_cache_destroy(qdio_aob_cache);
 616         kmem_cache_destroy(qdio_q_cache);
 617 }