drivers/s390/cio/qdio_setup.c

   1 /*
   2  * driver/s390/cio/qdio_setup.c
   3  *
   4  * qdio queue initialization
   5  *
   6  * Copyright (C) IBM Corp. 2008
   7  * Author(s): Jan Glauber <[email protected]>
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/slab.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 static struct kmem_cache *qdio_q_cache;
  22 static struct kmem_cache *qdio_aob_cache;
  23
  24 struct qaob *qdio_allocate_aob()
  25 {
  26         struct qaob *aob;
  27
  28         aob = kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
  29         return aob;
  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  * qebsm is only available under 64bit but the adapter sets the feature
  41  * flag anyway, so we manually override it.
  42  */
  43 static inline int qebsm_possible(void)
  44 {
  45 #ifdef CONFIG_64BIT
  46         return css_general_characteristics.qebsm;
  47 #endif
  48         return 0;
  49 }
  50
  51 /*
  52  * qib_param_field: pointer to 128 bytes or NULL, if no param field
  53  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
  54  */
  55 static void set_impl_params(struct qdio_irq *irq_ptr,
  56                             unsigned int qib_param_field_format,
  57                             unsigned char *qib_param_field,
  58                             unsigned long *input_slib_elements,
  59                             unsigned long *output_slib_elements)
  60 {
  61         struct qdio_q *q;
  62         int i, j;
  63
  64         if (!irq_ptr)
  65                 return;
  66
  67         irq_ptr->qib.pfmt = qib_param_field_format;
  68         if (qib_param_field)
  69                 memcpy(irq_ptr->qib.parm, qib_param_field,
  70                        QDIO_MAX_BUFFERS_PER_Q);
  71
  72         if (!input_slib_elements)
  73                 goto output;
  74
  75         for_each_input_queue(irq_ptr, q, i) {
  76                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  77                         q->slib->slibe[j].parms =
  78                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  79         }
  80 output:
  81         if (!output_slib_elements)
  82                 return;
  83
  84         for_each_output_queue(irq_ptr, q, i) {
  85                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  86                         q->slib->slibe[j].parms =
  87                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  88         }
  89 }
  90
  91 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
  92 {
  93         struct qdio_q *q;
  94         int i;
  95
  96         for (i = 0; i < nr_queues; i++) {
  97                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
  98                 if (!q)
  99                         return -ENOMEM;
 100
 101                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
 102                 if (!q->slib) {
 103                         kmem_cache_free(qdio_q_cache, q);
 104                         return -ENOMEM;
 105                 }
 106                 irq_ptr_qs[i] = q;
 107         }
 108         return 0;
 109 }
 110
 111 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 112 {
 113         int rc;
 114
 115         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 116         if (rc)
 117                 return rc;
 118         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 119         return rc;
 120 }
 121
 122 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 123                               qdio_handler_t *handler, int i)
 124 {
 125         struct slib *slib = q->slib;
 126
 127         /* queue must be cleared for qdio_establish */
 128         memset(q, 0, sizeof(*q));
 129         memset(slib, 0, PAGE_SIZE);
 130         q->slib = slib;
 131         q->irq_ptr = irq_ptr;
 132         q->mask = 1 << (31 - i);
 133         q->nr = i;
 134         q->handler = handler;
 135 }
 136
 137 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 138                                 void **sbals_array, int i)
 139 {
 140         struct qdio_q *prev;
 141         int j;
 142
 143         DBF_HEX(&q, sizeof(void *));
 144         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 145
 146         /* fill in sbal */
 147         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 148                 q->sbal[j] = *sbals_array++;
 149                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
 150         }
 151
 152         /* fill in slib */
 153         if (i > 0) {
 154                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 155                         : irq_ptr->output_qs[i - 1];
 156                 prev->slib->nsliba = (unsigned long)q->slib;
 157         }
 158
 159         q->slib->sla = (unsigned long)q->sl;
 160         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 161
 162         /* fill in sl */
 163         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 164                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 165 }
 166
 167 static void setup_queues(struct qdio_irq *irq_ptr,
 168                          struct qdio_initialize *qdio_init)
 169 {
 170         struct qdio_q *q;
 171         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 172         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 173         struct qdio_outbuf_state *output_sbal_state_array =
 174                                   qdio_init->output_sbal_state_array;
 175         int i;
 176
 177         for_each_input_queue(irq_ptr, q, i) {
 178                 DBF_EVENT("inq:%1d", i);
 179                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 180
 181                 q->is_input_q = 1;
 182                 q->u.in.queue_start_poll = qdio_init->queue_start_poll[i];
 183
 184                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 185                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 186
 187                 if (is_thinint_irq(irq_ptr)) {
 188                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 189                                      (unsigned long) q);
 190                 } else {
 191                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 192                                      (unsigned long) q);
 193                 }
 194         }
 195
 196         for_each_output_queue(irq_ptr, q, i) {
 197                 DBF_EVENT("outq:%1d", i);
 198                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 199
 200                 q->u.out.sbal_state = output_sbal_state_array;
 201                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 202
 203                 q->is_input_q = 0;
 204                 q->u.out.scan_threshold = qdio_init->scan_threshold;
 205                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 206                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 207
 208                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 209                              (unsigned long) q);
 210                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 211                             &qdio_outbound_timer, (unsigned long)q);
 212         }
 213 }
 214
 215 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 216 {
 217         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 218                 irq_ptr->siga_flag.input = 1;
 219         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 220                 irq_ptr->siga_flag.output = 1;
 221         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 222                 irq_ptr->siga_flag.sync = 1;
 223         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 224                 irq_ptr->siga_flag.sync_after_ai = 1;
 225         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 226                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 227 }
 228
 229 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 230                                   unsigned char qdioac, unsigned long token)
 231 {
 232         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 233                 goto no_qebsm;
 234         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 235             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 236                 goto no_qebsm;
 237
 238         irq_ptr->sch_token = token;
 239
 240         DBF_EVENT("V=V:1");
 241         DBF_EVENT("%8lx", irq_ptr->sch_token);
 242         return;
 243
 244 no_qebsm:
 245         irq_ptr->sch_token = 0;
 246         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 247         DBF_EVENT("noV=V");
 248 }
 249
 250 /*
 251  * If there is a qdio_irq we use the chsc_page and store the information
 252  * in the qdio_irq, otherwise we copy it to the specified structure.
 253  */
 254 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 255                         struct subchannel_id *schid,
 256                         struct qdio_ssqd_desc *data)
 257 {
 258         struct chsc_ssqd_area *ssqd;
 259         int rc;
 260
 261         DBF_EVENT("getssqd:%4x", schid->sch_no);
 262         if (irq_ptr != NULL)
 263                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 264         else
 265                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 266         memset(ssqd, 0, PAGE_SIZE);
 267
 268         ssqd->request = (struct chsc_header) {
 269                 .length = 0x0010,
 270                 .code   = 0x0024,
 271         };
 272         ssqd->first_sch = schid->sch_no;
 273         ssqd->last_sch = schid->sch_no;
 274         ssqd->ssid = schid->ssid;
 275
 276         if (chsc(ssqd))
 277                 return -EIO;
 278         rc = chsc_error_from_response(ssqd->response.code);
 279         if (rc)
 280                 return rc;
 281
 282         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 283             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 284             (ssqd->qdio_ssqd.sch != schid->sch_no))
 285                 return -EINVAL;
 286
 287         if (irq_ptr != NULL)
 288                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 289                        sizeof(struct qdio_ssqd_desc));
 290         else {
 291                 memcpy(data, &ssqd->qdio_ssqd,
 292                        sizeof(struct qdio_ssqd_desc));
 293                 free_page((unsigned long)ssqd);
 294         }
 295         return 0;
 296 }
 297
 298 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 299 {
 300         unsigned char qdioac;
 301         int rc;
 302
 303         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
 304         if (rc) {
 305                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 306                 DBF_ERROR("rc:%x", rc);
 307                 /* all flags set, worst case */
 308                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 309                          AC1_SIGA_SYNC_NEEDED;
 310         } else
 311                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 312
 313         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 314         process_ac_flags(irq_ptr, qdioac);
 315         DBF_EVENT("qdioac:%4x", qdioac);
 316 }
 317
 318 void qdio_release_memory(struct qdio_irq *irq_ptr)
 319 {
 320         struct qdio_q *q;
 321         int i;
 322
 323         /*
 324          * Must check queue array manually since irq_ptr->nr_input_queues /
 325          * irq_ptr->nr_input_queues may not yet be set.
 326          */
 327         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 328                 q = irq_ptr->input_qs[i];
 329                 if (q) {
 330                         free_page((unsigned long) q->slib);
 331                         kmem_cache_free(qdio_q_cache, q);
 332                 }
 333         }
 334         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 335                 q = irq_ptr->output_qs[i];
 336                 if (q) {
 337                         if (q->u.out.use_cq) {
 338                                 int n;
 339
 340                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
 341                                         struct qaob *aob = q->u.out.aobs[n];
 342                                         if (aob) {
 343                                                 qdio_release_aob(aob);
 344                                                 q->u.out.aobs[n] = NULL;
 345                                         }
 346                                 }
 347
 348                                 qdio_disable_async_operation(&q->u.out);
 349                         }
 350                         free_page((unsigned long) q->slib);
 351                         kmem_cache_free(qdio_q_cache, q);
 352                 }
 353         }
 354         free_page((unsigned long) irq_ptr->qdr);
 355         free_page(irq_ptr->chsc_page);
 356         free_page((unsigned long) irq_ptr);
 357 }
 358
 359 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 360                                      struct qdio_q **irq_ptr_qs,
 361                                      int i, int nr)
 362 {
 363         irq_ptr->qdr->qdf0[i + nr].sliba =
 364                 (unsigned long)irq_ptr_qs[i]->slib;
 365
 366         irq_ptr->qdr->qdf0[i + nr].sla =
 367                 (unsigned long)irq_ptr_qs[i]->sl;
 368
 369         irq_ptr->qdr->qdf0[i + nr].slsba =
 370                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 371
 372         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 373         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 374         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 375         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 376 }
 377
 378 static void setup_qdr(struct qdio_irq *irq_ptr,
 379                       struct qdio_initialize *qdio_init)
 380 {
 381         int i;
 382
 383         irq_ptr->qdr->qfmt = qdio_init->q_format;
 384         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 385         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 386         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 387         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 388         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 389         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 390
 391         for (i = 0; i < qdio_init->no_input_qs; i++)
 392                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 393
 394         for (i = 0; i < qdio_init->no_output_qs; i++)
 395                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 396                                          qdio_init->no_input_qs);
 397 }
 398
 399 static void setup_qib(struct qdio_irq *irq_ptr,
 400                       struct qdio_initialize *init_data)
 401 {
 402         if (qebsm_possible())
 403                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 404
 405         irq_ptr->qib.rflags |= init_data->qib_rflags;
 406
 407         irq_ptr->qib.qfmt = init_data->q_format;
 408         if (init_data->no_input_qs)
 409                 irq_ptr->qib.isliba =
 410                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 411         if (init_data->no_output_qs)
 412                 irq_ptr->qib.osliba =
 413                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 414         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 415 }
 416
 417 int qdio_setup_irq(struct qdio_initialize *init_data)
 418 {
 419         struct ciw *ciw;
 420         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 421         int rc;
 422
 423         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 424         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 425         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 426         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 427         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 428
 429         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
 430         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
 431
 432         /* wipes qib.ac, required by ar7063 */
 433         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 434
 435         irq_ptr->int_parm = init_data->int_parm;
 436         irq_ptr->nr_input_qs = init_data->no_input_qs;
 437         irq_ptr->nr_output_qs = init_data->no_output_qs;
 438
 439         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 440         irq_ptr->cdev = init_data->cdev;
 441         setup_queues(irq_ptr, init_data);
 442
 443         setup_qib(irq_ptr, init_data);
 444         qdio_setup_thinint(irq_ptr);
 445         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 446                         init_data->qib_param_field,
 447                         init_data->input_slib_elements,
 448                         init_data->output_slib_elements);
 449
 450         /* fill input and output descriptors */
 451         setup_qdr(irq_ptr, init_data);
 452
 453         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 454
 455         /* get qdio commands */
 456         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 457         if (!ciw) {
 458                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 459                 rc = -EINVAL;
 460                 goto out_err;
 461         }
 462         irq_ptr->equeue = *ciw;
 463
 464         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 465         if (!ciw) {
 466                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 467                 rc = -EINVAL;
 468                 goto out_err;
 469         }
 470         irq_ptr->aqueue = *ciw;
 471
 472         /* set new interrupt handler */
 473         irq_ptr->orig_handler = init_data->cdev->handler;
 474         init_data->cdev->handler = qdio_int_handler;
 475         return 0;
 476 out_err:
 477         qdio_release_memory(irq_ptr);
 478         return rc;
 479 }
 480
 481 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 482                                 struct ccw_device *cdev)
 483 {
 484         char s[80];
 485
 486         snprintf(s, 80, "qdio: %s %s on SC %x using "
 487                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 488                  dev_name(&cdev->dev),
 489                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 490                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 491                  irq_ptr->schid.sch_no,
 492                  is_thinint_irq(irq_ptr),
 493                  (irq_ptr->sch_token) ? 1 : 0,
 494                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 495                  css_general_characteristics.aif_tdd,
 496                  (irq_ptr->siga_flag.input) ? "R" : " ",
 497                  (irq_ptr->siga_flag.output) ? "W" : " ",
 498                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 499                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 500                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 501         printk(KERN_INFO "%s", s);
 502 }
 503
 504 int qdio_enable_async_operation(struct qdio_output_q *outq)
 505 {
 506         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
 507                              GFP_ATOMIC);
 508         if (!outq->aobs) {
 509                 outq->use_cq = 0;
 510                 return -ENOMEM;
 511         }
 512         outq->use_cq = 1;
 513         return 0;
 514 }
 515
 516 void qdio_disable_async_operation(struct qdio_output_q *q)
 517 {
 518         kfree(q->aobs);
 519         q->aobs = NULL;
 520         q->use_cq = 0;
 521 }
 522
 523 int __init qdio_setup_init(void)
 524 {
 525         int rc;
 526
 527         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 528                                          256, 0, NULL);
 529         if (!qdio_q_cache)
 530                 return -ENOMEM;
 531
 532         qdio_aob_cache = kmem_cache_create("qdio_aob",
 533                                         sizeof(struct qaob),
 534                                         sizeof(struct qaob),
 535                                         0,
 536                                         NULL);
 537         if (!qdio_aob_cache) {
 538                 rc = -ENOMEM;
 539                 goto free_qdio_q_cache;
 540         }
 541
 542         /* Check for OSA/FCP thin interrupts (bit 67). */
 543         DBF_EVENT("thinint:%1d",
 544                   (css_general_characteristics.aif_osa) ? 1 : 0);
 545
 546         /* Check for QEBSM support in general (bit 58). */
 547         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 548         rc = 0;
 549 out:
 550         return rc;
 551 free_qdio_q_cache:
 552         kmem_cache_destroy(qdio_q_cache);
 553         goto out;
 554 }
 555
 556 void qdio_setup_exit(void)
 557 {
 558         kmem_cache_destroy(qdio_aob_cache);
 559         kmem_cache_destroy(qdio_q_cache);
 560 }