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