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