drivers/s390/cio/qdio_setup.c

   1 /*
   2  * qdio queue initialization
   3  *
   4  * Copyright IBM Corp. 2008
   5  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/slab.h>
   9 #include <linux/export.h>
  10 #include <asm/qdio.h>
  11
  12 #include "cio.h"
  13 #include "css.h"
  14 #include "device.h"
  15 #include "ioasm.h"
  16 #include "chsc.h"
  17 #include "qdio.h"
  18 #include "qdio_debug.h"
  19
  20 static struct kmem_cache *qdio_q_cache;
  21 static struct kmem_cache *qdio_aob_cache;
  22
  23 struct qaob *qdio_allocate_aob(void)
  24 {
  25         return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
  26 }
  27 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
  28
  29 void qdio_release_aob(struct qaob *aob)
  30 {
  31         kmem_cache_free(qdio_aob_cache, aob);
  32 }
  33 EXPORT_SYMBOL_GPL(qdio_release_aob);
  34
  35 /*
  36  * qebsm is only available under 64bit but the adapter sets the feature
  37  * flag anyway, so we manually override it.
  38  */
  39 static inline int qebsm_possible(void)
  40 {
  41 #ifdef CONFIG_64BIT
  42         return css_general_characteristics.qebsm;
  43 #endif
  44         return 0;
  45 }
  46
  47 /*
  48  * qib_param_field: pointer to 128 bytes or NULL, if no param field
  49  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
  50  */
  51 static void set_impl_params(struct qdio_irq *irq_ptr,
  52                             unsigned int qib_param_field_format,
  53                             unsigned char *qib_param_field,
  54                             unsigned long *input_slib_elements,
  55                             unsigned long *output_slib_elements)
  56 {
  57         struct qdio_q *q;
  58         int i, j;
  59
  60         if (!irq_ptr)
  61                 return;
  62
  63         irq_ptr->qib.pfmt = qib_param_field_format;
  64         if (qib_param_field)
  65                 memcpy(irq_ptr->qib.parm, qib_param_field,
  66                        QDIO_MAX_BUFFERS_PER_Q);
  67
  68         if (!input_slib_elements)
  69                 goto output;
  70
  71         for_each_input_queue(irq_ptr, q, i) {
  72                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  73                         q->slib->slibe[j].parms =
  74                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  75         }
  76 output:
  77         if (!output_slib_elements)
  78                 return;
  79
  80         for_each_output_queue(irq_ptr, q, i) {
  81                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  82                         q->slib->slibe[j].parms =
  83                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  84         }
  85 }
  86
  87 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
  88 {
  89         struct qdio_q *q;
  90         int i;
  91
  92         for (i = 0; i < nr_queues; i++) {
  93                 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
  94                 if (!q)
  95                         return -ENOMEM;
  96
  97                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
  98                 if (!q->slib) {
  99                         kmem_cache_free(qdio_q_cache, q);
 100                         return -ENOMEM;
 101                 }
 102                 irq_ptr_qs[i] = q;
 103                 INIT_LIST_HEAD(&q->entry);
 104         }
 105         return 0;
 106 }
 107
 108 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 109 {
 110         int rc;
 111
 112         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 113         if (rc)
 114                 return rc;
 115         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 116         return rc;
 117 }
 118
 119 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 120                               qdio_handler_t *handler, int i)
 121 {
 122         struct slib *slib = q->slib;
 123
 124         /* queue must be cleared for qdio_establish */
 125         memset(q, 0, sizeof(*q));
 126         memset(slib, 0, PAGE_SIZE);
 127         q->slib = slib;
 128         q->irq_ptr = irq_ptr;
 129         q->mask = 1 << (31 - i);
 130         q->nr = i;
 131         q->handler = handler;
 132         INIT_LIST_HEAD(&q->entry);
 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
 148         /* fill in slib */
 149         if (i > 0) {
 150                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 151                         : irq_ptr->output_qs[i - 1];
 152                 prev->slib->nsliba = (unsigned long)q->slib;
 153         }
 154
 155         q->slib->sla = (unsigned long)q->sl;
 156         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 157
 158         /* fill in sl */
 159         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 160                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 161 }
 162
 163 static void setup_queues(struct qdio_irq *irq_ptr,
 164                          struct qdio_initialize *qdio_init)
 165 {
 166         struct qdio_q *q;
 167         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 168         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 169         struct qdio_outbuf_state *output_sbal_state_array =
 170                                   qdio_init->output_sbal_state_array;
 171         int i;
 172
 173         for_each_input_queue(irq_ptr, q, i) {
 174                 DBF_EVENT("inq:%1d", i);
 175                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 176
 177                 q->is_input_q = 1;
 178                 q->u.in.queue_start_poll = qdio_init->queue_start_poll_array ?
 179                                 qdio_init->queue_start_poll_array[i] : NULL;
 180
 181                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 182                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 183
 184                 if (is_thinint_irq(irq_ptr)) {
 185                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 186                                      (unsigned long) q);
 187                 } else {
 188                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 189                                      (unsigned long) q);
 190                 }
 191         }
 192
 193         for_each_output_queue(irq_ptr, q, i) {
 194                 DBF_EVENT("outq:%1d", i);
 195                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 196
 197                 q->u.out.sbal_state = output_sbal_state_array;
 198                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 199
 200                 q->is_input_q = 0;
 201                 q->u.out.scan_threshold = qdio_init->scan_threshold;
 202                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 203                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 204
 205                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 206                              (unsigned long) q);
 207                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 208                             &qdio_outbound_timer, (unsigned long)q);
 209         }
 210 }
 211
 212 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 213 {
 214         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 215                 irq_ptr->siga_flag.input = 1;
 216         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 217                 irq_ptr->siga_flag.output = 1;
 218         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 219                 irq_ptr->siga_flag.sync = 1;
 220         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 221                 irq_ptr->siga_flag.sync_after_ai = 1;
 222         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 223                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 224 }
 225
 226 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 227                                   unsigned char qdioac, unsigned long token)
 228 {
 229         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 230                 goto no_qebsm;
 231         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 232             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 233                 goto no_qebsm;
 234
 235         irq_ptr->sch_token = token;
 236
 237         DBF_EVENT("V=V:1");
 238         DBF_EVENT("%8lx", irq_ptr->sch_token);
 239         return;
 240
 241 no_qebsm:
 242         irq_ptr->sch_token = 0;
 243         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 244         DBF_EVENT("noV=V");
 245 }
 246
 247 /*
 248  * If there is a qdio_irq we use the chsc_page and store the information
 249  * in the qdio_irq, otherwise we copy it to the specified structure.
 250  */
 251 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 252                         struct subchannel_id *schid,
 253                         struct qdio_ssqd_desc *data)
 254 {
 255         struct chsc_ssqd_area *ssqd;
 256         int rc;
 257
 258         DBF_EVENT("getssqd:%4x", schid->sch_no);
 259         if (!irq_ptr) {
 260                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 261                 if (!ssqd)
 262                         return -ENOMEM;
 263         } else {
 264                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 265         }
 266
 267         rc = chsc_ssqd(*schid, ssqd);
 268         if (rc)
 269                 goto out;
 270
 271         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 272             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 273             (ssqd->qdio_ssqd.sch != schid->sch_no))
 274                 rc = -EINVAL;
 275
 276         if (!rc)
 277                 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
 278
 279 out:
 280         if (!irq_ptr)
 281                 free_page((unsigned long)ssqd);
 282
 283         return rc;
 284 }
 285
 286 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 287 {
 288         unsigned char qdioac;
 289         int rc;
 290
 291         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
 292         if (rc) {
 293                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 294                 DBF_ERROR("rc:%x", rc);
 295                 /* all flags set, worst case */
 296                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 297                          AC1_SIGA_SYNC_NEEDED;
 298         } else
 299                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 300
 301         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 302         process_ac_flags(irq_ptr, qdioac);
 303         DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
 304         DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
 305 }
 306
 307 void qdio_release_memory(struct qdio_irq *irq_ptr)
 308 {
 309         struct qdio_q *q;
 310         int i;
 311
 312         /*
 313          * Must check queue array manually since irq_ptr->nr_input_queues /
 314          * irq_ptr->nr_input_queues may not yet be set.
 315          */
 316         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 317                 q = irq_ptr->input_qs[i];
 318                 if (q) {
 319                         free_page((unsigned long) q->slib);
 320                         kmem_cache_free(qdio_q_cache, q);
 321                 }
 322         }
 323         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 324                 q = irq_ptr->output_qs[i];
 325                 if (q) {
 326                         if (q->u.out.use_cq) {
 327                                 int n;
 328
 329                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
 330                                         struct qaob *aob = q->u.out.aobs[n];
 331                                         if (aob) {
 332                                                 qdio_release_aob(aob);
 333                                                 q->u.out.aobs[n] = NULL;
 334                                         }
 335                                 }
 336
 337                                 qdio_disable_async_operation(&q->u.out);
 338                         }
 339                         free_page((unsigned long) q->slib);
 340                         kmem_cache_free(qdio_q_cache, q);
 341                 }
 342         }
 343         free_page((unsigned long) irq_ptr->qdr);
 344         free_page(irq_ptr->chsc_page);
 345         free_page((unsigned long) irq_ptr);
 346 }
 347
 348 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 349                                      struct qdio_q **irq_ptr_qs,
 350                                      int i, int nr)
 351 {
 352         irq_ptr->qdr->qdf0[i + nr].sliba =
 353                 (unsigned long)irq_ptr_qs[i]->slib;
 354
 355         irq_ptr->qdr->qdf0[i + nr].sla =
 356                 (unsigned long)irq_ptr_qs[i]->sl;
 357
 358         irq_ptr->qdr->qdf0[i + nr].slsba =
 359                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 360
 361         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 362         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 363         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 364         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 365 }
 366
 367 static void setup_qdr(struct qdio_irq *irq_ptr,
 368                       struct qdio_initialize *qdio_init)
 369 {
 370         int i;
 371
 372         irq_ptr->qdr->qfmt = qdio_init->q_format;
 373         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 374         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 375         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 376         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 377         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 378         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 379         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 380
 381         for (i = 0; i < qdio_init->no_input_qs; i++)
 382                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 383
 384         for (i = 0; i < qdio_init->no_output_qs; i++)
 385                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 386                                          qdio_init->no_input_qs);
 387 }
 388
 389 static void setup_qib(struct qdio_irq *irq_ptr,
 390                       struct qdio_initialize *init_data)
 391 {
 392         if (qebsm_possible())
 393                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 394
 395         irq_ptr->qib.rflags |= init_data->qib_rflags;
 396
 397         irq_ptr->qib.qfmt = init_data->q_format;
 398         if (init_data->no_input_qs)
 399                 irq_ptr->qib.isliba =
 400                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 401         if (init_data->no_output_qs)
 402                 irq_ptr->qib.osliba =
 403                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 404         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 405 }
 406
 407 int qdio_setup_irq(struct qdio_initialize *init_data)
 408 {
 409         struct ciw *ciw;
 410         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 411
 412         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 413         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 414         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 415         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 416         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 417
 418         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
 419         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
 420
 421         /* wipes qib.ac, required by ar7063 */
 422         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 423
 424         irq_ptr->int_parm = init_data->int_parm;
 425         irq_ptr->nr_input_qs = init_data->no_input_qs;
 426         irq_ptr->nr_output_qs = init_data->no_output_qs;
 427         irq_ptr->cdev = init_data->cdev;
 428         ccw_device_get_schid(irq_ptr->cdev, &irq_ptr->schid);
 429         setup_queues(irq_ptr, init_data);
 430
 431         setup_qib(irq_ptr, init_data);
 432         qdio_setup_thinint(irq_ptr);
 433         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 434                         init_data->qib_param_field,
 435                         init_data->input_slib_elements,
 436                         init_data->output_slib_elements);
 437
 438         /* fill input and output descriptors */
 439         setup_qdr(irq_ptr, init_data);
 440
 441         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 442
 443         /* get qdio commands */
 444         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 445         if (!ciw) {
 446                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 447                 return -EINVAL;
 448         }
 449         irq_ptr->equeue = *ciw;
 450
 451         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 452         if (!ciw) {
 453                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 454                 return -EINVAL;
 455         }
 456         irq_ptr->aqueue = *ciw;
 457
 458         /* set new interrupt handler */
 459         irq_ptr->orig_handler = init_data->cdev->handler;
 460         init_data->cdev->handler = qdio_int_handler;
 461         return 0;
 462 }
 463
 464 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 465                                 struct ccw_device *cdev)
 466 {
 467         char s[80];
 468
 469         snprintf(s, 80, "qdio: %s %s on SC %x using "
 470                  "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 471                  dev_name(&cdev->dev),
 472                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 473                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 474                  irq_ptr->schid.sch_no,
 475                  is_thinint_irq(irq_ptr),
 476                  (irq_ptr->sch_token) ? 1 : 0,
 477                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 478                  css_general_characteristics.aif_tdd,
 479                  (irq_ptr->siga_flag.input) ? "R" : " ",
 480                  (irq_ptr->siga_flag.output) ? "W" : " ",
 481                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 482                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 483                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 484         printk(KERN_INFO "%s", s);
 485 }
 486
 487 int qdio_enable_async_operation(struct qdio_output_q *outq)
 488 {
 489         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
 490                              GFP_ATOMIC);
 491         if (!outq->aobs) {
 492                 outq->use_cq = 0;
 493                 return -ENOMEM;
 494         }
 495         outq->use_cq = 1;
 496         return 0;
 497 }
 498
 499 void qdio_disable_async_operation(struct qdio_output_q *q)
 500 {
 501         kfree(q->aobs);
 502         q->aobs = NULL;
 503         q->use_cq = 0;
 504 }
 505
 506 int __init qdio_setup_init(void)
 507 {
 508         int rc;
 509
 510         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 511                                          256, 0, NULL);
 512         if (!qdio_q_cache)
 513                 return -ENOMEM;
 514
 515         qdio_aob_cache = kmem_cache_create("qdio_aob",
 516                                         sizeof(struct qaob),
 517                                         sizeof(struct qaob),
 518                                         0,
 519                                         NULL);
 520         if (!qdio_aob_cache) {
 521                 rc = -ENOMEM;
 522                 goto free_qdio_q_cache;
 523         }
 524
 525         /* Check for OSA/FCP thin interrupts (bit 67). */
 526         DBF_EVENT("thinint:%1d",
 527                   (css_general_characteristics.aif_osa) ? 1 : 0);
 528
 529         /* Check for QEBSM support in general (bit 58). */
 530         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 531         rc = 0;
 532 out:
 533         return rc;
 534 free_qdio_q_cache:
 535         kmem_cache_destroy(qdio_q_cache);
 536         goto out;
 537 }
 538
 539 void qdio_setup_exit(void)
 540 {
 541         kmem_cache_destroy(qdio_aob_cache);
 542         kmem_cache_destroy(qdio_q_cache);
 543 }