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 <[email protected]>
   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
  32 void qdio_release_aob(struct qaob *aob)
  33 {
  34         kmem_cache_free(qdio_aob_cache, aob);
  35 }
  36 EXPORT_SYMBOL_GPL(qdio_release_aob);
  37
  38 /**
  39  * qdio_free_buffers() - free qdio buffers
  40  * @buf: array of pointers to qdio buffers
  41  * @count: number of qdio buffers to free
  42  */
  43 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
  44 {
  45         int pos;
  46
  47         for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
  48                 free_page((unsigned long) buf[pos]);
  49 }
  50 EXPORT_SYMBOL_GPL(qdio_free_buffers);
  51
  52 /**
  53  * qdio_alloc_buffers() - allocate qdio buffers
  54  * @buf: array of pointers to qdio buffers
  55  * @count: number of qdio buffers to allocate
  56  */
  57 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
  58 {
  59         int pos;
  60
  61         for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
  62                 buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
  63                 if (!buf[pos]) {
  64                         qdio_free_buffers(buf, count);
  65                         return -ENOMEM;
  66                 }
  67         }
  68         for (pos = 0; pos < count; pos++)
  69                 if (pos % QBUFF_PER_PAGE)
  70                         buf[pos] = buf[pos - 1] + 1;
  71         return 0;
  72 }
  73 EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
  74
  75 /**
  76  * qdio_reset_buffers() - reset qdio buffers
  77  * @buf: array of pointers to qdio buffers
  78  * @count: number of qdio buffers that will be zeroed
  79  */
  80 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
  81 {
  82         int pos;
  83
  84         for (pos = 0; pos < count; pos++)
  85                 memset(buf[pos], 0, sizeof(struct qdio_buffer));
  86 }
  87 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
  88
  89 /*
  90  * qebsm is only available under 64bit but the adapter sets the feature
  91  * flag anyway, so we manually override it.
  92  */
  93 static inline int qebsm_possible(void)
  94 {
  95         return css_general_characteristics.qebsm;
  96 }
  97
  98 /*
  99  * qib_param_field: pointer to 128 bytes or NULL, if no param field
 100  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
 101  */
 102 static void set_impl_params(struct qdio_irq *irq_ptr,
 103                             unsigned int qib_param_field_format,
 104                             unsigned char *qib_param_field,
 105                             unsigned long *input_slib_elements,
 106                             unsigned long *output_slib_elements)
 107 {
 108         struct qdio_q *q;
 109         int i, j;
 110
 111         if (!irq_ptr)
 112                 return;
 113
 114         irq_ptr->qib.pfmt = qib_param_field_format;
 115         if (qib_param_field)
 116                 memcpy(irq_ptr->qib.parm, qib_param_field,
 117                        sizeof(irq_ptr->qib.parm));
 118
 119         if (!input_slib_elements)
 120                 goto output;
 121
 122         for_each_input_queue(irq_ptr, q, i) {
 123                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 124                         q->slib->slibe[j].parms =
 125                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
 126         }
 127 output:
 128         if (!output_slib_elements)
 129                 return;
 130
 131         for_each_output_queue(irq_ptr, q, i) {
 132                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 133                         q->slib->slibe[j].parms =
 134                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
 135         }
 136 }
 137
 138 static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
 139 {
 140         struct qdio_q *q;
 141         unsigned int i;
 142
 143         for (i = 0; i < count; i++) {
 144                 q = queues[i];
 145                 free_page((unsigned long) q->slib);
 146                 kmem_cache_free(qdio_q_cache, q);
 147         }
 148 }
 149
 150 void qdio_free_queues(struct qdio_irq *irq_ptr)
 151 {
 152         __qdio_free_queues(irq_ptr->input_qs, irq_ptr->max_input_qs);
 153         irq_ptr->max_input_qs = 0;
 154
 155         __qdio_free_queues(irq_ptr->output_qs, irq_ptr->max_output_qs);
 156         irq_ptr->max_output_qs = 0;
 157 }
 158
 159 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
 160 {
 161         struct qdio_q *q;
 162         int i;
 163
 164         for (i = 0; i < nr_queues; i++) {
 165                 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
 166                 if (!q) {
 167                         __qdio_free_queues(irq_ptr_qs, i);
 168                         return -ENOMEM;
 169                 }
 170
 171                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
 172                 if (!q->slib) {
 173                         kmem_cache_free(qdio_q_cache, q);
 174                         __qdio_free_queues(irq_ptr_qs, i);
 175                         return -ENOMEM;
 176                 }
 177                 irq_ptr_qs[i] = q;
 178         }
 179         return 0;
 180 }
 181
 182 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 183 {
 184         int rc;
 185
 186         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 187         if (rc)
 188                 return rc;
 189
 190         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 191         if (rc) {
 192                 __qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
 193                 return rc;
 194         }
 195
 196         irq_ptr->max_input_qs = nr_input_qs;
 197         irq_ptr->max_output_qs = nr_output_qs;
 198         return 0;
 199 }
 200
 201 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 202                               qdio_handler_t *handler, int i)
 203 {
 204         struct slib *slib = q->slib;
 205
 206         /* queue must be cleared for qdio_establish */
 207         memset(q, 0, sizeof(*q));
 208         memset(slib, 0, PAGE_SIZE);
 209         q->slib = slib;
 210         q->irq_ptr = irq_ptr;
 211         q->mask = 1 << (31 - i);
 212         q->nr = i;
 213         q->handler = handler;
 214 }
 215
 216 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 217                                 struct qdio_buffer **sbals_array, int i)
 218 {
 219         struct qdio_q *prev;
 220         int j;
 221
 222         DBF_HEX(&q, sizeof(void *));
 223         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 224
 225         /* fill in sbal */
 226         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 227                 q->sbal[j] = *sbals_array++;
 228
 229         /* fill in slib */
 230         if (i > 0) {
 231                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 232                         : irq_ptr->output_qs[i - 1];
 233                 prev->slib->nsliba = (unsigned long)q->slib;
 234         }
 235
 236         q->slib->sla = (unsigned long)q->sl;
 237         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 238
 239         /* fill in sl */
 240         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 241                 q->sl->element[j].sbal = virt_to_phys(q->sbal[j]);
 242 }
 243
 244 static void setup_queues(struct qdio_irq *irq_ptr,
 245                          struct qdio_initialize *qdio_init)
 246 {
 247         struct qdio_q *q;
 248         struct qdio_outbuf_state *output_sbal_state_array =
 249                                   qdio_init->output_sbal_state_array;
 250         int i;
 251
 252         for_each_input_queue(irq_ptr, q, i) {
 253                 DBF_EVENT("inq:%1d", i);
 254                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 255
 256                 q->is_input_q = 1;
 257
 258                 setup_storage_lists(q, irq_ptr,
 259                                     qdio_init->input_sbal_addr_array[i], i);
 260
 261                 if (is_thinint_irq(irq_ptr)) {
 262                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 263                                      (unsigned long) q);
 264                 } else {
 265                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 266                                      (unsigned long) q);
 267                 }
 268         }
 269
 270         for_each_output_queue(irq_ptr, q, i) {
 271                 DBF_EVENT("outq:%1d", i);
 272                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 273
 274                 q->u.out.sbal_state = output_sbal_state_array;
 275                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 276
 277                 q->is_input_q = 0;
 278                 setup_storage_lists(q, irq_ptr,
 279                                     qdio_init->output_sbal_addr_array[i], i);
 280
 281                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 282                              (unsigned long) q);
 283                 timer_setup(&q->u.out.timer, qdio_outbound_timer, 0);
 284         }
 285 }
 286
 287 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 288 {
 289         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 290                 irq_ptr->siga_flag.input = 1;
 291         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 292                 irq_ptr->siga_flag.output = 1;
 293         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 294                 irq_ptr->siga_flag.sync = 1;
 295         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 296                 irq_ptr->siga_flag.sync_after_ai = 1;
 297         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 298                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 299 }
 300
 301 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 302                                   unsigned char qdioac, unsigned long token)
 303 {
 304         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 305                 goto no_qebsm;
 306         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 307             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 308                 goto no_qebsm;
 309
 310         irq_ptr->sch_token = token;
 311
 312         DBF_EVENT("V=V:1");
 313         DBF_EVENT("%8lx", irq_ptr->sch_token);
 314         return;
 315
 316 no_qebsm:
 317         irq_ptr->sch_token = 0;
 318         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 319         DBF_EVENT("noV=V");
 320 }
 321
 322 /*
 323  * If there is a qdio_irq we use the chsc_page and store the information
 324  * in the qdio_irq, otherwise we copy it to the specified structure.
 325  */
 326 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 327                         struct subchannel_id *schid,
 328                         struct qdio_ssqd_desc *data)
 329 {
 330         struct chsc_ssqd_area *ssqd;
 331         int rc;
 332
 333         DBF_EVENT("getssqd:%4x", schid->sch_no);
 334         if (!irq_ptr) {
 335                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 336                 if (!ssqd)
 337                         return -ENOMEM;
 338         } else {
 339                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 340         }
 341
 342         rc = chsc_ssqd(*schid, ssqd);
 343         if (rc)
 344                 goto out;
 345
 346         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 347             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 348             (ssqd->qdio_ssqd.sch != schid->sch_no))
 349                 rc = -EINVAL;
 350
 351         if (!rc)
 352                 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
 353
 354 out:
 355         if (!irq_ptr)
 356                 free_page((unsigned long)ssqd);
 357
 358         return rc;
 359 }
 360
 361 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 362 {
 363         unsigned char qdioac;
 364         int rc;
 365
 366         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
 367         if (rc) {
 368                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 369                 DBF_ERROR("rc:%x", rc);
 370                 /* all flags set, worst case */
 371                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 372                          AC1_SIGA_SYNC_NEEDED;
 373         } else
 374                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 375
 376         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 377         process_ac_flags(irq_ptr, qdioac);
 378         DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
 379         DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
 380 }
 381
 382 void qdio_free_async_data(struct qdio_irq *irq_ptr)
 383 {
 384         struct qdio_q *q;
 385         int i;
 386
 387         for (i = 0; i < irq_ptr->max_output_qs; i++) {
 388                 q = irq_ptr->output_qs[i];
 389                 if (q->u.out.use_cq) {
 390                         unsigned int n;
 391
 392                         for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; n++) {
 393                                 struct qaob *aob = q->u.out.aobs[n];
 394
 395                                 if (aob) {
 396                                         qdio_release_aob(aob);
 397                                         q->u.out.aobs[n] = NULL;
 398                                 }
 399                         }
 400
 401                         qdio_disable_async_operation(&q->u.out);
 402                 }
 403         }
 404 }
 405
 406 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 407                                      struct qdio_q **irq_ptr_qs,
 408                                      int i, int nr)
 409 {
 410         irq_ptr->qdr->qdf0[i + nr].sliba =
 411                 (unsigned long)irq_ptr_qs[i]->slib;
 412
 413         irq_ptr->qdr->qdf0[i + nr].sla =
 414                 (unsigned long)irq_ptr_qs[i]->sl;
 415
 416         irq_ptr->qdr->qdf0[i + nr].slsba =
 417                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 418
 419         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 420         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 421         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 422         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 423 }
 424
 425 static void setup_qdr(struct qdio_irq *irq_ptr,
 426                       struct qdio_initialize *qdio_init)
 427 {
 428         int i;
 429
 430         irq_ptr->qdr->qfmt = qdio_init->q_format;
 431         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 432         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 433         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 434         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 435         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 436         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 437         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 438
 439         for (i = 0; i < qdio_init->no_input_qs; i++)
 440                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 441
 442         for (i = 0; i < qdio_init->no_output_qs; i++)
 443                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 444                                          qdio_init->no_input_qs);
 445 }
 446
 447 static void setup_qib(struct qdio_irq *irq_ptr,
 448                       struct qdio_initialize *init_data)
 449 {
 450         if (qebsm_possible())
 451                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 452
 453         irq_ptr->qib.rflags |= init_data->qib_rflags;
 454
 455         irq_ptr->qib.qfmt = init_data->q_format;
 456         if (init_data->no_input_qs)
 457                 irq_ptr->qib.isliba =
 458                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 459         if (init_data->no_output_qs)
 460                 irq_ptr->qib.osliba =
 461                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 462         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 463 }
 464
 465 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 466 {
 467         struct ccw_device *cdev = irq_ptr->cdev;
 468         struct ciw *ciw;
 469
 470         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 471         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 472         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 473         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 474         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 475
 476         irq_ptr->debugfs_dev = NULL;
 477         irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
 478         irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
 479
 480         /* wipes qib.ac, required by ar7063 */
 481         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 482
 483         irq_ptr->int_parm = init_data->int_parm;
 484         irq_ptr->nr_input_qs = init_data->no_input_qs;
 485         irq_ptr->nr_output_qs = init_data->no_output_qs;
 486         irq_ptr->scan_threshold = init_data->scan_threshold;
 487         ccw_device_get_schid(cdev, &irq_ptr->schid);
 488         setup_queues(irq_ptr, init_data);
 489
 490         if (init_data->irq_poll) {
 491                 irq_ptr->irq_poll = init_data->irq_poll;
 492                 set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
 493         } else {
 494                 irq_ptr->irq_poll = NULL;
 495         }
 496
 497         setup_qib(irq_ptr, init_data);
 498         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 499                         init_data->qib_param_field,
 500                         init_data->input_slib_elements,
 501                         init_data->output_slib_elements);
 502
 503         /* fill input and output descriptors */
 504         setup_qdr(irq_ptr, init_data);
 505
 506         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 507
 508         /* set our IRQ handler */
 509         spin_lock_irq(get_ccwdev_lock(cdev));
 510         irq_ptr->orig_handler = cdev->handler;
 511         cdev->handler = qdio_int_handler;
 512         spin_unlock_irq(get_ccwdev_lock(cdev));
 513
 514         /* get qdio commands */
 515         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
 516         if (!ciw) {
 517                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 518                 return -EINVAL;
 519         }
 520         irq_ptr->equeue = *ciw;
 521
 522         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
 523         if (!ciw) {
 524                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 525                 return -EINVAL;
 526         }
 527         irq_ptr->aqueue = *ciw;
 528
 529         return 0;
 530 }
 531
 532 void qdio_shutdown_irq(struct qdio_irq *irq)
 533 {
 534         struct ccw_device *cdev = irq->cdev;
 535
 536         /* restore IRQ handler */
 537         spin_lock_irq(get_ccwdev_lock(cdev));
 538         cdev->handler = irq->orig_handler;
 539         cdev->private->intparm = 0;
 540         spin_unlock_irq(get_ccwdev_lock(cdev));
 541 }
 542
 543 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
 544 {
 545         char s[80];
 546
 547         snprintf(s, 80, "qdio: %s %s on SC %x using "
 548                  "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 549                  dev_name(&irq_ptr->cdev->dev),
 550                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 551                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 552                  irq_ptr->schid.sch_no,
 553                  is_thinint_irq(irq_ptr),
 554                  (irq_ptr->sch_token) ? 1 : 0,
 555                  pci_out_supported(irq_ptr) ? 1 : 0,
 556                  css_general_characteristics.aif_tdd,
 557                  (irq_ptr->siga_flag.input) ? "R" : " ",
 558                  (irq_ptr->siga_flag.output) ? "W" : " ",
 559                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 560                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 561                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 562         printk(KERN_INFO "%s", s);
 563 }
 564
 565 int qdio_enable_async_operation(struct qdio_output_q *outq)
 566 {
 567         outq->aobs = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *),
 568                              GFP_KERNEL);
 569         if (!outq->aobs) {
 570                 outq->use_cq = 0;
 571                 return -ENOMEM;
 572         }
 573         outq->use_cq = 1;
 574         return 0;
 575 }
 576
 577 void qdio_disable_async_operation(struct qdio_output_q *q)
 578 {
 579         kfree(q->aobs);
 580         q->aobs = NULL;
 581         q->use_cq = 0;
 582 }
 583
 584 int __init qdio_setup_init(void)
 585 {
 586         int rc;
 587
 588         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 589                                          256, 0, NULL);
 590         if (!qdio_q_cache)
 591                 return -ENOMEM;
 592
 593         qdio_aob_cache = kmem_cache_create("qdio_aob",
 594                                         sizeof(struct qaob),
 595                                         sizeof(struct qaob),
 596                                         0,
 597                                         NULL);
 598         if (!qdio_aob_cache) {
 599                 rc = -ENOMEM;
 600                 goto free_qdio_q_cache;
 601         }
 602
 603         /* Check for OSA/FCP thin interrupts (bit 67). */
 604         DBF_EVENT("thinint:%1d",
 605                   (css_general_characteristics.aif_osa) ? 1 : 0);
 606
 607         /* Check for QEBSM support in general (bit 58). */
 608         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 609         rc = 0;
 610 out:
 611         return rc;
 612 free_qdio_q_cache:
 613         kmem_cache_destroy(qdio_q_cache);
 614         goto out;
 615 }
 616
 617 void qdio_setup_exit(void)
 618 {
 619         kmem_cache_destroy(qdio_aob_cache);
 620         kmem_cache_destroy(qdio_q_cache);
 621 }