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_alloc(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         }
 104         return 0;
 105 }
 106
 107 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 108 {
 109         int rc;
 110
 111         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 112         if (rc)
 113                 return rc;
 114         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 115         return rc;
 116 }
 117
 118 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 119                               qdio_handler_t *handler, int i)
 120 {
 121         struct slib *slib = q->slib;
 122
 123         /* queue must be cleared for qdio_establish */
 124         memset(q, 0, sizeof(*q));
 125         memset(slib, 0, PAGE_SIZE);
 126         q->slib = slib;
 127         q->irq_ptr = irq_ptr;
 128         q->mask = 1 << (31 - i);
 129         q->nr = i;
 130         q->handler = handler;
 131 }
 132
 133 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 134                                 void **sbals_array, int i)
 135 {
 136         struct qdio_q *prev;
 137         int j;
 138
 139         DBF_HEX(&q, sizeof(void *));
 140         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 141
 142         /* fill in sbal */
 143         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 144                 q->sbal[j] = *sbals_array++;
 145
 146         /* fill in slib */
 147         if (i > 0) {
 148                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 149                         : irq_ptr->output_qs[i - 1];
 150                 prev->slib->nsliba = (unsigned long)q->slib;
 151         }
 152
 153         q->slib->sla = (unsigned long)q->sl;
 154         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 155
 156         /* fill in sl */
 157         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 158                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 159 }
 160
 161 static void setup_queues(struct qdio_irq *irq_ptr,
 162                          struct qdio_initialize *qdio_init)
 163 {
 164         struct qdio_q *q;
 165         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 166         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 167         struct qdio_outbuf_state *output_sbal_state_array =
 168                                   qdio_init->output_sbal_state_array;
 169         int i;
 170
 171         for_each_input_queue(irq_ptr, q, i) {
 172                 DBF_EVENT("inq:%1d", i);
 173                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 174
 175                 q->is_input_q = 1;
 176                 q->u.in.queue_start_poll = qdio_init->queue_start_poll_array ?
 177                                 qdio_init->queue_start_poll_array[i] : NULL;
 178
 179                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 180                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 181
 182                 if (is_thinint_irq(irq_ptr)) {
 183                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 184                                      (unsigned long) q);
 185                 } else {
 186                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 187                                      (unsigned long) q);
 188                 }
 189         }
 190
 191         for_each_output_queue(irq_ptr, q, i) {
 192                 DBF_EVENT("outq:%1d", i);
 193                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 194
 195                 q->u.out.sbal_state = output_sbal_state_array;
 196                 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
 197
 198                 q->is_input_q = 0;
 199                 q->u.out.scan_threshold = qdio_init->scan_threshold;
 200                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 201                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 202
 203                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 204                              (unsigned long) q);
 205                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 206                             &qdio_outbound_timer, (unsigned long)q);
 207         }
 208 }
 209
 210 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 211 {
 212         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 213                 irq_ptr->siga_flag.input = 1;
 214         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 215                 irq_ptr->siga_flag.output = 1;
 216         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 217                 irq_ptr->siga_flag.sync = 1;
 218         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
 219                 irq_ptr->siga_flag.sync_after_ai = 1;
 220         if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
 221                 irq_ptr->siga_flag.sync_out_after_pci = 1;
 222 }
 223
 224 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 225                                   unsigned char qdioac, unsigned long token)
 226 {
 227         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 228                 goto no_qebsm;
 229         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 230             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 231                 goto no_qebsm;
 232
 233         irq_ptr->sch_token = token;
 234
 235         DBF_EVENT("V=V:1");
 236         DBF_EVENT("%8lx", irq_ptr->sch_token);
 237         return;
 238
 239 no_qebsm:
 240         irq_ptr->sch_token = 0;
 241         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 242         DBF_EVENT("noV=V");
 243 }
 244
 245 /*
 246  * If there is a qdio_irq we use the chsc_page and store the information
 247  * in the qdio_irq, otherwise we copy it to the specified structure.
 248  */
 249 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 250                         struct subchannel_id *schid,
 251                         struct qdio_ssqd_desc *data)
 252 {
 253         struct chsc_ssqd_area *ssqd;
 254         int rc;
 255
 256         DBF_EVENT("getssqd:%4x", schid->sch_no);
 257         if (!irq_ptr) {
 258                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 259                 if (!ssqd)
 260                         return -ENOMEM;
 261         } else {
 262                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 263         }
 264
 265         rc = chsc_ssqd(*schid, ssqd);
 266         if (rc)
 267                 goto out;
 268
 269         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 270             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 271             (ssqd->qdio_ssqd.sch != schid->sch_no))
 272                 rc = -EINVAL;
 273
 274         if (!rc)
 275                 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
 276
 277 out:
 278         if (!irq_ptr)
 279                 free_page((unsigned long)ssqd);
 280
 281         return rc;
 282 }
 283
 284 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 285 {
 286         unsigned char qdioac;
 287         int rc;
 288
 289         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
 290         if (rc) {
 291                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 292                 DBF_ERROR("rc:%x", rc);
 293                 /* all flags set, worst case */
 294                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 295                          AC1_SIGA_SYNC_NEEDED;
 296         } else
 297                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 298
 299         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 300         process_ac_flags(irq_ptr, qdioac);
 301         DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
 302         DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
 303 }
 304
 305 void qdio_release_memory(struct qdio_irq *irq_ptr)
 306 {
 307         struct qdio_q *q;
 308         int i;
 309
 310         /*
 311          * Must check queue array manually since irq_ptr->nr_input_queues /
 312          * irq_ptr->nr_input_queues may not yet be set.
 313          */
 314         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 315                 q = irq_ptr->input_qs[i];
 316                 if (q) {
 317                         free_page((unsigned long) q->slib);
 318                         kmem_cache_free(qdio_q_cache, q);
 319                 }
 320         }
 321         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 322                 q = irq_ptr->output_qs[i];
 323                 if (q) {
 324                         if (q->u.out.use_cq) {
 325                                 int n;
 326
 327                                 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
 328                                         struct qaob *aob = q->u.out.aobs[n];
 329                                         if (aob) {
 330                                                 qdio_release_aob(aob);
 331                                                 q->u.out.aobs[n] = NULL;
 332                                         }
 333                                 }
 334
 335                                 qdio_disable_async_operation(&q->u.out);
 336                         }
 337                         free_page((unsigned long) q->slib);
 338                         kmem_cache_free(qdio_q_cache, q);
 339                 }
 340         }
 341         free_page((unsigned long) irq_ptr->qdr);
 342         free_page(irq_ptr->chsc_page);
 343         free_page((unsigned long) irq_ptr);
 344 }
 345
 346 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 347                                      struct qdio_q **irq_ptr_qs,
 348                                      int i, int nr)
 349 {
 350         irq_ptr->qdr->qdf0[i + nr].sliba =
 351                 (unsigned long)irq_ptr_qs[i]->slib;
 352
 353         irq_ptr->qdr->qdf0[i + nr].sla =
 354                 (unsigned long)irq_ptr_qs[i]->sl;
 355
 356         irq_ptr->qdr->qdf0[i + nr].slsba =
 357                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 358
 359         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 360         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 361         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 362         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 363 }
 364
 365 static void setup_qdr(struct qdio_irq *irq_ptr,
 366                       struct qdio_initialize *qdio_init)
 367 {
 368         int i;
 369
 370         irq_ptr->qdr->qfmt = qdio_init->q_format;
 371         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 372         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 373         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 374         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 375         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 376         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 377         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 378
 379         for (i = 0; i < qdio_init->no_input_qs; i++)
 380                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 381
 382         for (i = 0; i < qdio_init->no_output_qs; i++)
 383                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 384                                          qdio_init->no_input_qs);
 385 }
 386
 387 static void setup_qib(struct qdio_irq *irq_ptr,
 388                       struct qdio_initialize *init_data)
 389 {
 390         if (qebsm_possible())
 391                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 392
 393         irq_ptr->qib.rflags |= init_data->qib_rflags;
 394
 395         irq_ptr->qib.qfmt = init_data->q_format;
 396         if (init_data->no_input_qs)
 397                 irq_ptr->qib.isliba =
 398                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 399         if (init_data->no_output_qs)
 400                 irq_ptr->qib.osliba =
 401                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 402         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 403 }
 404
 405 int qdio_setup_irq(struct qdio_initialize *init_data)
 406 {
 407         struct ciw *ciw;
 408         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 409         int rc;
 410
 411         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 412         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 413         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 414         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 415         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 416
 417         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
 418         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
 419
 420         /* wipes qib.ac, required by ar7063 */
 421         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 422
 423         irq_ptr->int_parm = init_data->int_parm;
 424         irq_ptr->nr_input_qs = init_data->no_input_qs;
 425         irq_ptr->nr_output_qs = init_data->no_output_qs;
 426         irq_ptr->cdev = init_data->cdev;
 427         ccw_device_get_schid(irq_ptr->cdev, &irq_ptr->schid);
 428         setup_queues(irq_ptr, init_data);
 429
 430         setup_qib(irq_ptr, init_data);
 431         qdio_setup_thinint(irq_ptr);
 432         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 433                         init_data->qib_param_field,
 434                         init_data->input_slib_elements,
 435                         init_data->output_slib_elements);
 436
 437         /* fill input and output descriptors */
 438         setup_qdr(irq_ptr, init_data);
 439
 440         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 441
 442         /* get qdio commands */
 443         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 444         if (!ciw) {
 445                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 446                 rc = -EINVAL;
 447                 goto out_err;
 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                 rc = -EINVAL;
 455                 goto out_err;
 456         }
 457         irq_ptr->aqueue = *ciw;
 458
 459         /* set new interrupt handler */
 460         irq_ptr->orig_handler = init_data->cdev->handler;
 461         init_data->cdev->handler = qdio_int_handler;
 462         return 0;
 463 out_err:
 464         qdio_release_memory(irq_ptr);
 465         return rc;
 466 }
 467
 468 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 469                                 struct ccw_device *cdev)
 470 {
 471         char s[80];
 472
 473         snprintf(s, 80, "qdio: %s %s on SC %x using "
 474                  "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n",
 475                  dev_name(&cdev->dev),
 476                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 477                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 478                  irq_ptr->schid.sch_no,
 479                  is_thinint_irq(irq_ptr),
 480                  (irq_ptr->sch_token) ? 1 : 0,
 481                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 482                  css_general_characteristics.aif_tdd,
 483                  (irq_ptr->siga_flag.input) ? "R" : " ",
 484                  (irq_ptr->siga_flag.output) ? "W" : " ",
 485                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 486                  (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
 487                  (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
 488         printk(KERN_INFO "%s", s);
 489 }
 490
 491 int qdio_enable_async_operation(struct qdio_output_q *outq)
 492 {
 493         outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
 494                              GFP_ATOMIC);
 495         if (!outq->aobs) {
 496                 outq->use_cq = 0;
 497                 return -ENOMEM;
 498         }
 499         outq->use_cq = 1;
 500         return 0;
 501 }
 502
 503 void qdio_disable_async_operation(struct qdio_output_q *q)
 504 {
 505         kfree(q->aobs);
 506         q->aobs = NULL;
 507         q->use_cq = 0;
 508 }
 509
 510 int __init qdio_setup_init(void)
 511 {
 512         int rc;
 513
 514         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 515                                          256, 0, NULL);
 516         if (!qdio_q_cache)
 517                 return -ENOMEM;
 518
 519         qdio_aob_cache = kmem_cache_create("qdio_aob",
 520                                         sizeof(struct qaob),
 521                                         sizeof(struct qaob),
 522                                         0,
 523                                         NULL);
 524         if (!qdio_aob_cache) {
 525                 rc = -ENOMEM;
 526                 goto free_qdio_q_cache;
 527         }
 528
 529         /* Check for OSA/FCP thin interrupts (bit 67). */
 530         DBF_EVENT("thinint:%1d",
 531                   (css_general_characteristics.aif_osa) ? 1 : 0);
 532
 533         /* Check for QEBSM support in general (bit 58). */
 534         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 535         rc = 0;
 536 out:
 537         return rc;
 538 free_qdio_q_cache:
 539         kmem_cache_destroy(qdio_q_cache);
 540         goto out;
 541 }
 542
 543 void qdio_setup_exit(void)
 544 {
 545         kmem_cache_destroy(qdio_aob_cache);
 546         kmem_cache_destroy(qdio_q_cache);
 547 }