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 <jang@linux.vnet.ibm.com>
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/export.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 static struct kmem_cache *qdio_q_cache;
  23 static struct kmem_cache *qdio_aob_cache;
  24
  25 struct qaob *qdio_allocate_aob(void)
  26 {
  27         return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
  28 }
  29 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
  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  * qebsm is only available under 64bit but the adapter sets the feature
  39  * flag anyway, so we manually override it.
  40  */
  41 static inline int qebsm_possible(void)
  42 {
  43 #ifdef CONFIG_64BIT
  44         return css_general_characteristics.qebsm;
  45 #endif
  46         return 0;
  47 }
  48
  49 /*
  50  * qib_param_field: pointer to 128 bytes or NULL, if no param field
  51  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
  52  */
  53 static void set_impl_params(struct qdio_irq *irq_ptr,
  54                             unsigned int qib_param_field_format,
  55                             unsigned char *qib_param_field,
  56                             unsigned long *input_slib_elements,
  57                             unsigned long *output_slib_elements)
  58 {
  59         struct qdio_q *q;
  60         int i, j;
  61
  62         if (!irq_ptr)
  63                 return;
  64
  65         irq_ptr->qib.pfmt = qib_param_field_format;
  66         if (qib_param_field)
  67                 memcpy(irq_ptr->qib.parm, qib_param_field,
  68                        QDIO_MAX_BUFFERS_PER_Q);
  69
  70         if (!input_slib_elements)
  71                 goto output;
  72
  73         for_each_input_queue(irq_ptr, q, i) {
  74                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  75                         q->slib->slibe[j].parms =
  76                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  77         }
  78 output:
  79         if (!output_slib_elements)
  80                 return;
  81
  82         for_each_output_queue(irq_ptr, q, i) {
  83                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  84                         q->slib->slibe[j].parms =
  85                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  86         }
  87 }
  88
  89 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
  90 {
  91         struct qdio_q *q;
  92         int i;
  93
  94         for (i = 0; i < nr_queues; i++) {
  95                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
  96                 if (!q)
  97                         return -ENOMEM;
  98
  99                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
 100                 if (!q->slib) {
 101                         kmem_cache_free(qdio_q_cache, q);
 102                         return -ENOMEM;
 103                 }
 104                 irq_ptr_qs[i] = q;
 105         }
 106         return 0;
 107 }
 108
 109 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 110 {
 111         int rc;
 112
 113         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 114         if (rc)
 115                 return rc;
 116         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 117         return rc;
 118 }
 119
 120 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 121                               qdio_handler_t *handler, int i)
 122 {
 123         struct slib *slib = q->slib;
 124
 125         /* queue must be cleared for qdio_establish */
 126         memset(q, 0, sizeof(*q));
 127         memset(slib, 0, PAGE_SIZE);
 128         q->slib = slib;
 129         q->irq_ptr = irq_ptr;
 130         q->mask = 1 << (31 - i);
 131         q->nr = i;
 132         q->handler = handler;
 133 }
 134
 135 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 136                                 void **sbals_array, int i)
 137 {
 138         struct qdio_q *prev;
 139         int j;
 140
 141         DBF_HEX(&q, sizeof(void *));
 142         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 143
 144         /* fill in sbal */
 145         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 146                 q->sbal[j] = *sbals_array++;
 147                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
 148         }
 149
 150         /* fill in slib */
 151         if (i > 0) {
 152                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 153                         : irq_ptr->output_qs[i - 1];
 154                 prev->slib->nsliba = (unsigned long)q->slib;
 155         }
 156
 157         q->slib->sla = (unsigned long)q->sl;
 158         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 159
 160         /* fill in sl */
 161         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 162                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 163 }
 164
 165 static void setup_queues(struct qdio_irq *irq_ptr,
 166                          struct qdio_initialize *qdio_init)
 167 {
 168         struct qdio_q *q;
 169         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 170         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 171         struct qdio_outbuf_state *output_sbal_state_array =
 172                                   qdio_init->output_sbal_state_array;
 173         int i;
 174
 175         for_each_input_queue(irq_ptr, q, i) {
 176                 DBF_EVENT("inq:%1d", i);
 177                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 178
 179                 q->is_input_q = 1;
 180                 q->u.in.queue_start_poll = qdio_init->queue_start_poll[i];
 181
 182                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 183                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 184
 185                 if (is_thinint_irq(irq_ptr)) {
 186                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 187                                      (unsigned long) q);
 188                 } else {
 189                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 190                                      (unsigned long) q);
 191                 }
 192         }
 193
 194         for_each_output_queue(irq_ptr, q, i) {
 195                 DBF_EVENT("outq:%1d", i);
 196                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 197
 198                 q->u.out.sbal_state = output_sbal_state_array;
 199                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 200
 201                 q->is_input_q = 0;
 202                 q->u.out.scan_threshold = qdio_init->scan_threshold;
 203                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 204                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 205
 206                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 207                              (unsigned long) q);
 208                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 209                             &qdio_outbound_timer, (unsigned long)q);
 210         }
 211 }
 212
 213 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 214 {
 215         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 216                 irq_ptr->siga_flag.input = 1;
 217         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 218                 irq_ptr->siga_flag.output = 1;
 219         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 220                 irq_ptr->siga_flag.sync = 1;
 221         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 222                 irq_ptr->siga_flag.sync_after_ai = 1;
 223         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 224                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 225 }
 226
 227 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 228                                   unsigned char qdioac, unsigned long token)
 229 {
 230         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 231                 goto no_qebsm;
 232         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 233             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 234                 goto no_qebsm;
 235
 236         irq_ptr->sch_token = token;
 237
 238         DBF_EVENT("V=V:1");
 239         DBF_EVENT("%8lx", irq_ptr->sch_token);
 240         return;
 241
 242 no_qebsm:
 243         irq_ptr->sch_token = 0;
 244         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 245         DBF_EVENT("noV=V");
 246 }
 247
 248 /*
 249  * If there is a qdio_irq we use the chsc_page and store the information
 250  * in the qdio_irq, otherwise we copy it to the specified structure.
 251  */
 252 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 253                         struct subchannel_id *schid,
 254                         struct qdio_ssqd_desc *data)
 255 {
 256         struct chsc_ssqd_area *ssqd;
 257         int rc;
 258
 259         DBF_EVENT("getssqd:%4x", schid->sch_no);
 260         if (irq_ptr != NULL)
 261                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 262         else
 263                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 264         memset(ssqd, 0, PAGE_SIZE);
 265
 266         ssqd->request = (struct chsc_header) {
 267                 .length = 0x0010,
 268                 .code   = 0x0024,
 269         };
 270         ssqd->first_sch = schid->sch_no;
 271         ssqd->last_sch = schid->sch_no;
 272         ssqd->ssid = schid->ssid;
 273
 274         if (chsc(ssqd))
 275                 return -EIO;
 276         rc = chsc_error_from_response(ssqd->response.code);
 277         if (rc)
 278                 return rc;
 279
 280         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 281             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 282             (ssqd->qdio_ssqd.sch != schid->sch_no))
 283                 return -EINVAL;
 284
 285         if (irq_ptr != NULL)
 286                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 287                        sizeof(struct qdio_ssqd_desc));
 288         else {
 289                 memcpy(data, &ssqd->qdio_ssqd,
 290                        sizeof(struct qdio_ssqd_desc));
 291                 free_page((unsigned long)ssqd);
 292         }
 293         return 0;
 294 }
 295
 296 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 297 {
 298         unsigned char qdioac;
 299         int rc;
 300
 301         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
 302         if (rc) {
 303                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 304                 DBF_ERROR("rc:%x", rc);
 305                 /* all flags set, worst case */
 306                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 307                          AC1_SIGA_SYNC_NEEDED;
 308         } else
 309                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 310
 311         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 312         process_ac_flags(irq_ptr, qdioac);
 313         DBF_EVENT("qdioac:%4x", qdioac);
 314 }
 315
 316 void qdio_release_memory(struct qdio_irq *irq_ptr)
 317 {
 318         struct qdio_q *q;
 319         int i;
 320
 321         /*
 322          * Must check queue array manually since irq_ptr->nr_input_queues /
 323          * irq_ptr->nr_input_queues may not yet be set.
 324          */
 325         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 326                 q = irq_ptr->input_qs[i];
 327                 if (q) {
 328                         free_page((unsigned long) q->slib);
 329                         kmem_cache_free(qdio_q_cache, q);
 330                 }
 331         }
 332         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 333                 q = irq_ptr->output_qs[i];
 334                 if (q) {
 335                         if (q->u.out.use_cq) {
 336                                 int n;
 337
 338                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
 339                                         struct qaob *aob = q->u.out.aobs[n];
 340                                         if (aob) {
 341                                                 qdio_release_aob(aob);
 342                                                 q->u.out.aobs[n] = NULL;
 343                                         }
 344                                 }
 345
 346                                 qdio_disable_async_operation(&q->u.out);
 347                         }
 348                         free_page((unsigned long) q->slib);
 349                         kmem_cache_free(qdio_q_cache, q);
 350                 }
 351         }
 352         free_page((unsigned long) irq_ptr->qdr);
 353         free_page(irq_ptr->chsc_page);
 354         free_page((unsigned long) irq_ptr);
 355 }
 356
 357 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 358                                      struct qdio_q **irq_ptr_qs,
 359                                      int i, int nr)
 360 {
 361         irq_ptr->qdr->qdf0[i + nr].sliba =
 362                 (unsigned long)irq_ptr_qs[i]->slib;
 363
 364         irq_ptr->qdr->qdf0[i + nr].sla =
 365                 (unsigned long)irq_ptr_qs[i]->sl;
 366
 367         irq_ptr->qdr->qdf0[i + nr].slsba =
 368                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 369
 370         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 371         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 372         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 373         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 374 }
 375
 376 static void setup_qdr(struct qdio_irq *irq_ptr,
 377                       struct qdio_initialize *qdio_init)
 378 {
 379         int i;
 380
 381         irq_ptr->qdr->qfmt = qdio_init->q_format;
 382         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 383         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 384         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 385         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 386         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 387         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 388         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 389
 390         for (i = 0; i < qdio_init->no_input_qs; i++)
 391                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 392
 393         for (i = 0; i < qdio_init->no_output_qs; i++)
 394                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 395                                          qdio_init->no_input_qs);
 396 }
 397
 398 static void setup_qib(struct qdio_irq *irq_ptr,
 399                       struct qdio_initialize *init_data)
 400 {
 401         if (qebsm_possible())
 402                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 403
 404         irq_ptr->qib.rflags |= init_data->qib_rflags;
 405
 406         irq_ptr->qib.qfmt = init_data->q_format;
 407         if (init_data->no_input_qs)
 408                 irq_ptr->qib.isliba =
 409                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 410         if (init_data->no_output_qs)
 411                 irq_ptr->qib.osliba =
 412                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 413         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 414 }
 415
 416 int qdio_setup_irq(struct qdio_initialize *init_data)
 417 {
 418         struct ciw *ciw;
 419         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 420         int rc;
 421
 422         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 423         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 424         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 425         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 426         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 427
 428         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
 429         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
 430
 431         /* wipes qib.ac, required by ar7063 */
 432         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 433
 434         irq_ptr->int_parm = init_data->int_parm;
 435         irq_ptr->nr_input_qs = init_data->no_input_qs;
 436         irq_ptr->nr_output_qs = init_data->no_output_qs;
 437
 438         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 439         irq_ptr->cdev = init_data->cdev;
 440         setup_queues(irq_ptr, init_data);
 441
 442         setup_qib(irq_ptr, init_data);
 443         qdio_setup_thinint(irq_ptr);
 444         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 445                         init_data->qib_param_field,
 446                         init_data->input_slib_elements,
 447                         init_data->output_slib_elements);
 448
 449         /* fill input and output descriptors */
 450         setup_qdr(irq_ptr, init_data);
 451
 452         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 453
 454         /* get qdio commands */
 455         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 456         if (!ciw) {
 457                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 458                 rc = -EINVAL;
 459                 goto out_err;
 460         }
 461         irq_ptr->equeue = *ciw;
 462
 463         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 464         if (!ciw) {
 465                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 466                 rc = -EINVAL;
 467                 goto out_err;
 468         }
 469         irq_ptr->aqueue = *ciw;
 470
 471         /* set new interrupt handler */
 472         irq_ptr->orig_handler = init_data->cdev->handler;
 473         init_data->cdev->handler = qdio_int_handler;
 474         return 0;
 475 out_err:
 476         qdio_release_memory(irq_ptr);
 477         return rc;
 478 }
 479
 480 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 481                                 struct ccw_device *cdev)
 482 {
 483         char s[80];
 484
 485         snprintf(s, 80, "qdio: %s %s on SC %x using "
 486                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 487                  dev_name(&cdev->dev),
 488                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 489                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 490                  irq_ptr->schid.sch_no,
 491                  is_thinint_irq(irq_ptr),
 492                  (irq_ptr->sch_token) ? 1 : 0,
 493                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 494                  css_general_characteristics.aif_tdd,
 495                  (irq_ptr->siga_flag.input) ? "R" : " ",
 496                  (irq_ptr->siga_flag.output) ? "W" : " ",
 497                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 498                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 499                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 500         printk(KERN_INFO "%s", s);
 501 }
 502
 503 int qdio_enable_async_operation(struct qdio_output_q *outq)
 504 {
 505         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
 506                              GFP_ATOMIC);
 507         if (!outq->aobs) {
 508                 outq->use_cq = 0;
 509                 return -ENOMEM;
 510         }
 511         outq->use_cq = 1;
 512         return 0;
 513 }
 514
 515 void qdio_disable_async_operation(struct qdio_output_q *q)
 516 {
 517         kfree(q->aobs);
 518         q->aobs = NULL;
 519         q->use_cq = 0;
 520 }
 521
 522 int __init qdio_setup_init(void)
 523 {
 524         int rc;
 525
 526         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 527                                          256, 0, NULL);
 528         if (!qdio_q_cache)
 529                 return -ENOMEM;
 530
 531         qdio_aob_cache = kmem_cache_create("qdio_aob",
 532                                         sizeof(struct qaob),
 533                                         sizeof(struct qaob),
 534                                         0,
 535                                         NULL);
 536         if (!qdio_aob_cache) {
 537                 rc = -ENOMEM;
 538                 goto free_qdio_q_cache;
 539         }
 540
 541         /* Check for OSA/FCP thin interrupts (bit 67). */
 542         DBF_EVENT("thinint:%1d",
 543                   (css_general_characteristics.aif_osa) ? 1 : 0);
 544
 545         /* Check for QEBSM support in general (bit 58). */
 546         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 547         rc = 0;
 548 out:
 549         return rc;
 550 free_qdio_q_cache:
 551         kmem_cache_destroy(qdio_q_cache);
 552         goto out;
 553 }
 554
 555 void qdio_setup_exit(void)
 556 {
 557         kmem_cache_destroy(qdio_aob_cache);
 558         kmem_cache_destroy(qdio_q_cache);
 559 }