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()
  26 {
  27         struct qaob *aob;
  28
  29         aob = kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
  30         return aob;
  31 }
  32 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
  33
  34 void qdio_release_aob(struct qaob *aob)
  35 {
  36         kmem_cache_free(qdio_aob_cache, aob);
  37 }
  38 EXPORT_SYMBOL_GPL(qdio_release_aob);
  39
  40 /*
  41  * qebsm is only available under 64bit but the adapter sets the feature
  42  * flag anyway, so we manually override it.
  43  */
  44 static inline int qebsm_possible(void)
  45 {
  46 #ifdef CONFIG_64BIT
  47         return css_general_characteristics.qebsm;
  48 #endif
  49         return 0;
  50 }
  51
  52 /*
  53  * qib_param_field: pointer to 128 bytes or NULL, if no param field
  54  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
  55  */
  56 static void set_impl_params(struct qdio_irq *irq_ptr,
  57                             unsigned int qib_param_field_format,
  58                             unsigned char *qib_param_field,
  59                             unsigned long *input_slib_elements,
  60                             unsigned long *output_slib_elements)
  61 {
  62         struct qdio_q *q;
  63         int i, j;
  64
  65         if (!irq_ptr)
  66                 return;
  67
  68         irq_ptr->qib.pfmt = qib_param_field_format;
  69         if (qib_param_field)
  70                 memcpy(irq_ptr->qib.parm, qib_param_field,
  71                        QDIO_MAX_BUFFERS_PER_Q);
  72
  73         if (!input_slib_elements)
  74                 goto output;
  75
  76         for_each_input_queue(irq_ptr, q, i) {
  77                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  78                         q->slib->slibe[j].parms =
  79                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  80         }
  81 output:
  82         if (!output_slib_elements)
  83                 return;
  84
  85         for_each_output_queue(irq_ptr, q, i) {
  86                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  87                         q->slib->slibe[j].parms =
  88                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  89         }
  90 }
  91
  92 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
  93 {
  94         struct qdio_q *q;
  95         int i;
  96
  97         for (i = 0; i < nr_queues; i++) {
  98                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
  99                 if (!q)
 100                         return -ENOMEM;
 101
 102                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
 103                 if (!q->slib) {
 104                         kmem_cache_free(qdio_q_cache, q);
 105                         return -ENOMEM;
 106                 }
 107                 irq_ptr_qs[i] = q;
 108         }
 109         return 0;
 110 }
 111
 112 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 113 {
 114         int rc;
 115
 116         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 117         if (rc)
 118                 return rc;
 119         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 120         return rc;
 121 }
 122
 123 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 124                               qdio_handler_t *handler, int i)
 125 {
 126         struct slib *slib = q->slib;
 127
 128         /* queue must be cleared for qdio_establish */
 129         memset(q, 0, sizeof(*q));
 130         memset(slib, 0, PAGE_SIZE);
 131         q->slib = slib;
 132         q->irq_ptr = irq_ptr;
 133         q->mask = 1 << (31 - i);
 134         q->nr = i;
 135         q->handler = handler;
 136 }
 137
 138 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 139                                 void **sbals_array, int i)
 140 {
 141         struct qdio_q *prev;
 142         int j;
 143
 144         DBF_HEX(&q, sizeof(void *));
 145         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 146
 147         /* fill in sbal */
 148         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 149                 q->sbal[j] = *sbals_array++;
 150                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
 151         }
 152
 153         /* fill in slib */
 154         if (i > 0) {
 155                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 156                         : irq_ptr->output_qs[i - 1];
 157                 prev->slib->nsliba = (unsigned long)q->slib;
 158         }
 159
 160         q->slib->sla = (unsigned long)q->sl;
 161         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 162
 163         /* fill in sl */
 164         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 165                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 166 }
 167
 168 static void setup_queues(struct qdio_irq *irq_ptr,
 169                          struct qdio_initialize *qdio_init)
 170 {
 171         struct qdio_q *q;
 172         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 173         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 174         struct qdio_outbuf_state *output_sbal_state_array =
 175                                   qdio_init->output_sbal_state_array;
 176         int i;
 177
 178         for_each_input_queue(irq_ptr, q, i) {
 179                 DBF_EVENT("inq:%1d", i);
 180                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 181
 182                 q->is_input_q = 1;
 183                 q->u.in.queue_start_poll = qdio_init->queue_start_poll[i];
 184
 185                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 186                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 187
 188                 if (is_thinint_irq(irq_ptr)) {
 189                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 190                                      (unsigned long) q);
 191                 } else {
 192                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 193                                      (unsigned long) q);
 194                 }
 195         }
 196
 197         for_each_output_queue(irq_ptr, q, i) {
 198                 DBF_EVENT("outq:%1d", i);
 199                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 200
 201                 q->u.out.sbal_state = output_sbal_state_array;
 202                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 203
 204                 q->is_input_q = 0;
 205                 q->u.out.scan_threshold = qdio_init->scan_threshold;
 206                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 207                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 208
 209                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 210                              (unsigned long) q);
 211                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 212                             &qdio_outbound_timer, (unsigned long)q);
 213         }
 214 }
 215
 216 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 217 {
 218         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 219                 irq_ptr->siga_flag.input = 1;
 220         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 221                 irq_ptr->siga_flag.output = 1;
 222         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 223                 irq_ptr->siga_flag.sync = 1;
 224         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 225                 irq_ptr->siga_flag.sync_after_ai = 1;
 226         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 227                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 228 }
 229
 230 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 231                                   unsigned char qdioac, unsigned long token)
 232 {
 233         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 234                 goto no_qebsm;
 235         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 236             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 237                 goto no_qebsm;
 238
 239         irq_ptr->sch_token = token;
 240
 241         DBF_EVENT("V=V:1");
 242         DBF_EVENT("%8lx", irq_ptr->sch_token);
 243         return;
 244
 245 no_qebsm:
 246         irq_ptr->sch_token = 0;
 247         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 248         DBF_EVENT("noV=V");
 249 }
 250
 251 /*
 252  * If there is a qdio_irq we use the chsc_page and store the information
 253  * in the qdio_irq, otherwise we copy it to the specified structure.
 254  */
 255 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 256                         struct subchannel_id *schid,
 257                         struct qdio_ssqd_desc *data)
 258 {
 259         struct chsc_ssqd_area *ssqd;
 260         int rc;
 261
 262         DBF_EVENT("getssqd:%4x", schid->sch_no);
 263         if (irq_ptr != NULL)
 264                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 265         else
 266                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 267         memset(ssqd, 0, PAGE_SIZE);
 268
 269         ssqd->request = (struct chsc_header) {
 270                 .length = 0x0010,
 271                 .code   = 0x0024,
 272         };
 273         ssqd->first_sch = schid->sch_no;
 274         ssqd->last_sch = schid->sch_no;
 275         ssqd->ssid = schid->ssid;
 276
 277         if (chsc(ssqd))
 278                 return -EIO;
 279         rc = chsc_error_from_response(ssqd->response.code);
 280         if (rc)
 281                 return rc;
 282
 283         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 284             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 285             (ssqd->qdio_ssqd.sch != schid->sch_no))
 286                 return -EINVAL;
 287
 288         if (irq_ptr != NULL)
 289                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 290                        sizeof(struct qdio_ssqd_desc));
 291         else {
 292                 memcpy(data, &ssqd->qdio_ssqd,
 293                        sizeof(struct qdio_ssqd_desc));
 294                 free_page((unsigned long)ssqd);
 295         }
 296         return 0;
 297 }
 298
 299 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 300 {
 301         unsigned char qdioac;
 302         int rc;
 303
 304         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
 305         if (rc) {
 306                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 307                 DBF_ERROR("rc:%x", rc);
 308                 /* all flags set, worst case */
 309                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 310                          AC1_SIGA_SYNC_NEEDED;
 311         } else
 312                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 313
 314         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 315         process_ac_flags(irq_ptr, qdioac);
 316         DBF_EVENT("qdioac:%4x", qdioac);
 317 }
 318
 319 void qdio_release_memory(struct qdio_irq *irq_ptr)
 320 {
 321         struct qdio_q *q;
 322         int i;
 323
 324         /*
 325          * Must check queue array manually since irq_ptr->nr_input_queues /
 326          * irq_ptr->nr_input_queues may not yet be set.
 327          */
 328         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 329                 q = irq_ptr->input_qs[i];
 330                 if (q) {
 331                         free_page((unsigned long) q->slib);
 332                         kmem_cache_free(qdio_q_cache, q);
 333                 }
 334         }
 335         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 336                 q = irq_ptr->output_qs[i];
 337                 if (q) {
 338                         if (q->u.out.use_cq) {
 339                                 int n;
 340
 341                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
 342                                         struct qaob *aob = q->u.out.aobs[n];
 343                                         if (aob) {
 344                                                 qdio_release_aob(aob);
 345                                                 q->u.out.aobs[n] = NULL;
 346                                         }
 347                                 }
 348
 349                                 qdio_disable_async_operation(&q->u.out);
 350                         }
 351                         free_page((unsigned long) q->slib);
 352                         kmem_cache_free(qdio_q_cache, q);
 353                 }
 354         }
 355         free_page((unsigned long) irq_ptr->qdr);
 356         free_page(irq_ptr->chsc_page);
 357         free_page((unsigned long) irq_ptr);
 358 }
 359
 360 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 361                                      struct qdio_q **irq_ptr_qs,
 362                                      int i, int nr)
 363 {
 364         irq_ptr->qdr->qdf0[i + nr].sliba =
 365                 (unsigned long)irq_ptr_qs[i]->slib;
 366
 367         irq_ptr->qdr->qdf0[i + nr].sla =
 368                 (unsigned long)irq_ptr_qs[i]->sl;
 369
 370         irq_ptr->qdr->qdf0[i + nr].slsba =
 371                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 372
 373         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 374         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 375         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 376         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 377 }
 378
 379 static void setup_qdr(struct qdio_irq *irq_ptr,
 380                       struct qdio_initialize *qdio_init)
 381 {
 382         int i;
 383
 384         irq_ptr->qdr->qfmt = qdio_init->q_format;
 385         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 386         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 387         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 388         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 389         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 390         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 391         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 392
 393         for (i = 0; i < qdio_init->no_input_qs; i++)
 394                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 395
 396         for (i = 0; i < qdio_init->no_output_qs; i++)
 397                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 398                                          qdio_init->no_input_qs);
 399 }
 400
 401 static void setup_qib(struct qdio_irq *irq_ptr,
 402                       struct qdio_initialize *init_data)
 403 {
 404         if (qebsm_possible())
 405                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 406
 407         irq_ptr->qib.rflags |= init_data->qib_rflags;
 408
 409         irq_ptr->qib.qfmt = init_data->q_format;
 410         if (init_data->no_input_qs)
 411                 irq_ptr->qib.isliba =
 412                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 413         if (init_data->no_output_qs)
 414                 irq_ptr->qib.osliba =
 415                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 416         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 417 }
 418
 419 int qdio_setup_irq(struct qdio_initialize *init_data)
 420 {
 421         struct ciw *ciw;
 422         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 423         int rc;
 424
 425         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 426         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 427         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 428         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 429         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 430
 431         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
 432         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
 433
 434         /* wipes qib.ac, required by ar7063 */
 435         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 436
 437         irq_ptr->int_parm = init_data->int_parm;
 438         irq_ptr->nr_input_qs = init_data->no_input_qs;
 439         irq_ptr->nr_output_qs = init_data->no_output_qs;
 440
 441         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 442         irq_ptr->cdev = init_data->cdev;
 443         setup_queues(irq_ptr, init_data);
 444
 445         setup_qib(irq_ptr, init_data);
 446         qdio_setup_thinint(irq_ptr);
 447         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 448                         init_data->qib_param_field,
 449                         init_data->input_slib_elements,
 450                         init_data->output_slib_elements);
 451
 452         /* fill input and output descriptors */
 453         setup_qdr(irq_ptr, init_data);
 454
 455         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 456
 457         /* get qdio commands */
 458         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 459         if (!ciw) {
 460                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 461                 rc = -EINVAL;
 462                 goto out_err;
 463         }
 464         irq_ptr->equeue = *ciw;
 465
 466         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 467         if (!ciw) {
 468                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 469                 rc = -EINVAL;
 470                 goto out_err;
 471         }
 472         irq_ptr->aqueue = *ciw;
 473
 474         /* set new interrupt handler */
 475         irq_ptr->orig_handler = init_data->cdev->handler;
 476         init_data->cdev->handler = qdio_int_handler;
 477         return 0;
 478 out_err:
 479         qdio_release_memory(irq_ptr);
 480         return rc;
 481 }
 482
 483 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 484                                 struct ccw_device *cdev)
 485 {
 486         char s[80];
 487
 488         snprintf(s, 80, "qdio: %s %s on SC %x using "
 489                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 490                  dev_name(&cdev->dev),
 491                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 492                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 493                  irq_ptr->schid.sch_no,
 494                  is_thinint_irq(irq_ptr),
 495                  (irq_ptr->sch_token) ? 1 : 0,
 496                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 497                  css_general_characteristics.aif_tdd,
 498                  (irq_ptr->siga_flag.input) ? "R" : " ",
 499                  (irq_ptr->siga_flag.output) ? "W" : " ",
 500                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 501                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 502                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 503         printk(KERN_INFO "%s", s);
 504 }
 505
 506 int qdio_enable_async_operation(struct qdio_output_q *outq)
 507 {
 508         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
 509                              GFP_ATOMIC);
 510         if (!outq->aobs) {
 511                 outq->use_cq = 0;
 512                 return -ENOMEM;
 513         }
 514         outq->use_cq = 1;
 515         return 0;
 516 }
 517
 518 void qdio_disable_async_operation(struct qdio_output_q *q)
 519 {
 520         kfree(q->aobs);
 521         q->aobs = NULL;
 522         q->use_cq = 0;
 523 }
 524
 525 int __init qdio_setup_init(void)
 526 {
 527         int rc;
 528
 529         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 530                                          256, 0, NULL);
 531         if (!qdio_q_cache)
 532                 return -ENOMEM;
 533
 534         qdio_aob_cache = kmem_cache_create("qdio_aob",
 535                                         sizeof(struct qaob),
 536                                         sizeof(struct qaob),
 537                                         0,
 538                                         NULL);
 539         if (!qdio_aob_cache) {
 540                 rc = -ENOMEM;
 541                 goto free_qdio_q_cache;
 542         }
 543
 544         /* Check for OSA/FCP thin interrupts (bit 67). */
 545         DBF_EVENT("thinint:%1d",
 546                   (css_general_characteristics.aif_osa) ? 1 : 0);
 547
 548         /* Check for QEBSM support in general (bit 58). */
 549         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 550         rc = 0;
 551 out:
 552         return rc;
 553 free_qdio_q_cache:
 554         kmem_cache_destroy(qdio_q_cache);
 555         goto out;
 556 }
 557
 558 void qdio_setup_exit(void)
 559 {
 560         kmem_cache_destroy(qdio_aob_cache);
 561         kmem_cache_destroy(qdio_q_cache);
 562 }