git.oblomov.eu Git - linux-2.6/blob - 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 <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
  23 /*
  24  * qebsm is only available under 64bit but the adapter sets the feature
  25  * flag anyway, so we manually override it.
  26  */
  27 static inline int qebsm_possible(void)
  28 {
  29 #ifdef CONFIG_64BIT
  30         return css_general_characteristics.qebsm;
  31 #endif
  32         return 0;
  33 }
  34
  35 /*
  36  * qib_param_field: pointer to 128 bytes or NULL, if no param field
  37  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
  38  */
  39 static void set_impl_params(struct qdio_irq *irq_ptr,
  40                             unsigned int qib_param_field_format,
  41                             unsigned char *qib_param_field,
  42                             unsigned long *input_slib_elements,
  43                             unsigned long *output_slib_elements)
  44 {
  45         struct qdio_q *q;
  46         int i, j;
  47
  48         if (!irq_ptr)
  49                 return;
  50
  51         WARN_ON((unsigned long)&irq_ptr->qib & 0xff);
  52         irq_ptr->qib.pfmt = qib_param_field_format;
  53         if (qib_param_field)
  54                 memcpy(irq_ptr->qib.parm, qib_param_field,
  55                        QDIO_MAX_BUFFERS_PER_Q);
  56
  57         if (!input_slib_elements)
  58                 goto output;
  59
  60         for_each_input_queue(irq_ptr, q, i) {
  61                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  62                         q->slib->slibe[j].parms =
  63                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  64         }
  65 output:
  66         if (!output_slib_elements)
  67                 return;
  68
  69         for_each_output_queue(irq_ptr, q, i) {
  70                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  71                         q->slib->slibe[j].parms =
  72                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  73         }
  74 }
  75
  76 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
  77 {
  78         struct qdio_q *q;
  79         int i;
  80
  81         for (i = 0; i < nr_queues; i++) {
  82                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
  83                 if (!q)
  84                         return -ENOMEM;
  85                 WARN_ON((unsigned long)q & 0xff);
  86
  87                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
  88                 if (!q->slib) {
  89                         kmem_cache_free(qdio_q_cache, q);
  90                         return -ENOMEM;
  91                 }
  92                 WARN_ON((unsigned long)q->slib & 0x7ff);
  93                 irq_ptr_qs[i] = q;
  94         }
  95         return 0;
  96 }
  97
  98 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
  99 {
 100         int rc;
 101
 102         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 103         if (rc)
 104                 return rc;
 105         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 106         return rc;
 107 }
 108
 109 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 110                               qdio_handler_t *handler, int i)
 111 {
 112         /* must be cleared by every qdio_establish */
 113         memset(q, 0, ((char *)&q->slib) - ((char *)q));
 114         memset(q->slib, 0, PAGE_SIZE);
 115
 116         q->irq_ptr = irq_ptr;
 117         q->mask = 1 << (31 - i);
 118         q->nr = i;
 119         q->handler = handler;
 120 }
 121
 122 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 123                                 void **sbals_array, char *dbf_text, int i)
 124 {
 125         struct qdio_q *prev;
 126         int j;
 127
 128         QDIO_DBF_TEXT0(0, setup, dbf_text);
 129         QDIO_DBF_HEX0(0, setup, &q, sizeof(void *));
 130
 131         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 132
 133         /* fill in sbal */
 134         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 135                 q->sbal[j] = *sbals_array++;
 136                 WARN_ON((unsigned long)q->sbal[j] & 0xff);
 137         }
 138
 139         /* fill in slib */
 140         if (i > 0) {
 141                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 142                         : irq_ptr->output_qs[i - 1];
 143                 prev->slib->nsliba = (unsigned long)q->slib;
 144         }
 145
 146         q->slib->sla = (unsigned long)q->sl;
 147         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 148
 149         /* fill in sl */
 150         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 151                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 152
 153         QDIO_DBF_TEXT2(0, setup, "sl-sb-b0");
 154         QDIO_DBF_HEX2(0, setup, q->sl, sizeof(void *));
 155         QDIO_DBF_HEX2(0, setup, &q->slsb, sizeof(void *));
 156         QDIO_DBF_HEX2(0, setup, q->sbal, sizeof(void *));
 157 }
 158
 159 static void setup_queues(struct qdio_irq *irq_ptr,
 160                          struct qdio_initialize *qdio_init)
 161 {
 162         char dbf_text[20];
 163         struct qdio_q *q;
 164         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 165         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 166         int i;
 167
 168         sprintf(dbf_text, "qset%4x", qdio_init->cdev->private->schid.sch_no);
 169         QDIO_DBF_TEXT0(0, setup, dbf_text);
 170
 171         for_each_input_queue(irq_ptr, q, i) {
 172                 sprintf(dbf_text, "in-q%4x", i);
 173                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 174
 175                 q->is_input_q = 1;
 176                 spin_lock_init(&q->u.in.lock);
 177                 setup_storage_lists(q, irq_ptr, input_sbal_array, dbf_text, i);
 178                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 179
 180                 if (is_thinint_irq(irq_ptr))
 181                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 182                                      (unsigned long) q);
 183                 else
 184                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 185                                      (unsigned long) q);
 186         }
 187
 188         for_each_output_queue(irq_ptr, q, i) {
 189                 sprintf(dbf_text, "outq%4x", i);
 190                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 191
 192                 q->is_input_q = 0;
 193                 setup_storage_lists(q, irq_ptr, output_sbal_array,
 194                                     dbf_text, i);
 195                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 196
 197                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 198                              (unsigned long) q);
 199                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 200                             &qdio_outbound_timer, (unsigned long)q);
 201         }
 202 }
 203
 204 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 205 {
 206         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 207                 irq_ptr->siga_flag.input = 1;
 208         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 209                 irq_ptr->siga_flag.output = 1;
 210         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 211                 irq_ptr->siga_flag.sync = 1;
 212         if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
 213                 irq_ptr->siga_flag.no_sync_ti = 1;
 214         if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
 215                 irq_ptr->siga_flag.no_sync_out_pci = 1;
 216
 217         if (irq_ptr->siga_flag.no_sync_out_pci &&
 218             irq_ptr->siga_flag.no_sync_ti)
 219                 irq_ptr->siga_flag.no_sync_out_ti = 1;
 220 }
 221
 222 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 223                                   unsigned char qdioac, unsigned long token)
 224 {
 225         char dbf_text[15];
 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         QDIO_DBF_TEXT0(0, setup, "V=V:1");
 236         sprintf(dbf_text, "%8lx", irq_ptr->sch_token);
 237         QDIO_DBF_TEXT0(0, setup, dbf_text);
 238         return;
 239
 240 no_qebsm:
 241         irq_ptr->sch_token = 0;
 242         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 243         QDIO_DBF_TEXT0(0, setup, "noV=V");
 244 }
 245
 246 static int __get_ssqd_info(struct qdio_irq *irq_ptr)
 247 {
 248         struct chsc_ssqd_area *ssqd;
 249         int rc;
 250
 251         QDIO_DBF_TEXT0(0, setup, "getssqd");
 252         ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 253         memset(ssqd, 0, PAGE_SIZE);
 254
 255         ssqd->request = (struct chsc_header) {
 256                 .length = 0x0010,
 257                 .code   = 0x0024,
 258         };
 259         ssqd->first_sch = irq_ptr->schid.sch_no;
 260         ssqd->last_sch = irq_ptr->schid.sch_no;
 261         ssqd->ssid = irq_ptr->schid.ssid;
 262
 263         if (chsc(ssqd))
 264                 return -EIO;
 265         rc = chsc_error_from_response(ssqd->response.code);
 266         if (rc)
 267                 return rc;
 268
 269         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 270             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 271             (ssqd->qdio_ssqd.sch != irq_ptr->schid.sch_no))
 272                 return -EINVAL;
 273
 274         memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 275                sizeof(struct qdio_ssqd_desc));
 276         return 0;
 277 }
 278
 279 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 280 {
 281         unsigned char qdioac;
 282         char dbf_text[15];
 283         int rc;
 284
 285         rc = __get_ssqd_info(irq_ptr);
 286         if (rc) {
 287                 QDIO_DBF_TEXT2(0, setup, "ssqdasig");
 288                 sprintf(dbf_text, "schn%4x", irq_ptr->schid.sch_no);
 289                 QDIO_DBF_TEXT2(0, setup, dbf_text);
 290                 sprintf(dbf_text, "rc:%d", rc);
 291                 QDIO_DBF_TEXT2(0, setup, dbf_text);
 292                 /* all flags set, worst case */
 293                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 294                          AC1_SIGA_SYNC_NEEDED;
 295         } else
 296                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 297
 298         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 299         process_ac_flags(irq_ptr, qdioac);
 300
 301         sprintf(dbf_text, "qdioac%2x", qdioac);
 302         QDIO_DBF_TEXT2(0, setup, dbf_text);
 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                         free_page((unsigned long) q->slib);
 325                         kmem_cache_free(qdio_q_cache, q);
 326                 }
 327         }
 328         free_page((unsigned long) irq_ptr->qdr);
 329         free_page(irq_ptr->chsc_page);
 330         free_page((unsigned long) irq_ptr);
 331 }
 332
 333 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 334                                      struct qdio_q **irq_ptr_qs,
 335                                      int i, int nr)
 336 {
 337         irq_ptr->qdr->qdf0[i + nr].sliba =
 338                 (unsigned long)irq_ptr_qs[i]->slib;
 339
 340         irq_ptr->qdr->qdf0[i + nr].sla =
 341                 (unsigned long)irq_ptr_qs[i]->sl;
 342
 343         irq_ptr->qdr->qdf0[i + nr].slsba =
 344                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 345
 346         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY;
 347         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY;
 348         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY;
 349         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY;
 350 }
 351
 352 static void setup_qdr(struct qdio_irq *irq_ptr,
 353                       struct qdio_initialize *qdio_init)
 354 {
 355         int i;
 356
 357         irq_ptr->qdr->qfmt = qdio_init->q_format;
 358         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 359         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 360         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 361         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 362         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 363         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY;
 364
 365         for (i = 0; i < qdio_init->no_input_qs; i++)
 366                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 367
 368         for (i = 0; i < qdio_init->no_output_qs; i++)
 369                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 370                                          qdio_init->no_input_qs);
 371 }
 372
 373 static void setup_qib(struct qdio_irq *irq_ptr,
 374                       struct qdio_initialize *init_data)
 375 {
 376         if (qebsm_possible())
 377                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 378
 379         irq_ptr->qib.qfmt = init_data->q_format;
 380         if (init_data->no_input_qs)
 381                 irq_ptr->qib.isliba =
 382                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 383         if (init_data->no_output_qs)
 384                 irq_ptr->qib.osliba =
 385                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 386         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 387 }
 388
 389 int qdio_setup_irq(struct qdio_initialize *init_data)
 390 {
 391         struct ciw *ciw;
 392         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 393         int rc;
 394
 395         memset(irq_ptr, 0, ((char *)&irq_ptr->qdr) - ((char *)irq_ptr));
 396         /* wipes qib.ac, required by ar7063 */
 397         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 398
 399         irq_ptr->int_parm = init_data->int_parm;
 400         irq_ptr->nr_input_qs = init_data->no_input_qs;
 401         irq_ptr->nr_output_qs = init_data->no_output_qs;
 402
 403         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 404         irq_ptr->cdev = init_data->cdev;
 405         setup_queues(irq_ptr, init_data);
 406
 407         setup_qib(irq_ptr, init_data);
 408         qdio_setup_thinint(irq_ptr);
 409         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 410                         init_data->qib_param_field,
 411                         init_data->input_slib_elements,
 412                         init_data->output_slib_elements);
 413
 414         /* fill input and output descriptors */
 415         setup_qdr(irq_ptr, init_data);
 416
 417         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 418
 419         /* get qdio commands */
 420         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 421         if (!ciw) {
 422                 QDIO_DBF_TEXT2(1, setup, "no eq");
 423                 rc = -EINVAL;
 424                 goto out_err;
 425         }
 426         irq_ptr->equeue = *ciw;
 427
 428         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 429         if (!ciw) {
 430                 QDIO_DBF_TEXT2(1, setup, "no aq");
 431                 rc = -EINVAL;
 432                 goto out_err;
 433         }
 434         irq_ptr->aqueue = *ciw;
 435
 436         /* set new interrupt handler */
 437         irq_ptr->orig_handler = init_data->cdev->handler;
 438         init_data->cdev->handler = qdio_int_handler;
 439         return 0;
 440 out_err:
 441         qdio_release_memory(irq_ptr);
 442         return rc;
 443 }
 444
 445 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 446                                 struct ccw_device *cdev)
 447 {
 448         char s[80];
 449
 450         sprintf(s, "qdio: %s ", dev_name(&cdev->dev));
 451         switch (irq_ptr->qib.qfmt) {
 452         case QDIO_QETH_QFMT:
 453                 sprintf(s + strlen(s), "OSA ");
 454                 break;
 455         case QDIO_ZFCP_QFMT:
 456                 sprintf(s + strlen(s), "ZFCP ");
 457                 break;
 458         case QDIO_IQDIO_QFMT:
 459                 sprintf(s + strlen(s), "HS ");
 460                 break;
 461         }
 462         sprintf(s + strlen(s), "on SC %x using ", irq_ptr->schid.sch_no);
 463         sprintf(s + strlen(s), "AI:%d ", is_thinint_irq(irq_ptr));
 464         sprintf(s + strlen(s), "QEBSM:%d ", (irq_ptr->sch_token) ? 1 : 0);
 465         sprintf(s + strlen(s), "PCI:%d ",
 466                 (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0);
 467         sprintf(s + strlen(s), "TDD:%d ", css_general_characteristics.aif_tdd);
 468         sprintf(s + strlen(s), "SIGA:");
 469         sprintf(s + strlen(s), "%s", (irq_ptr->siga_flag.input) ? "R" : " ");
 470         sprintf(s + strlen(s), "%s", (irq_ptr->siga_flag.output) ? "W" : " ");
 471         sprintf(s + strlen(s), "%s", (irq_ptr->siga_flag.sync) ? "S" : " ");
 472         sprintf(s + strlen(s), "%s",
 473                 (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ");
 474         sprintf(s + strlen(s), "%s",
 475                 (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ");
 476         sprintf(s + strlen(s), "%s",
 477                 (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
 478         sprintf(s + strlen(s), "\n");
 479         printk(KERN_INFO "%s", s);
 480 }
 481
 482 int __init qdio_setup_init(void)
 483 {
 484         char dbf_text[15];
 485
 486         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 487                                          256, 0, NULL);
 488         if (!qdio_q_cache)
 489                 return -ENOMEM;
 490
 491         /* Check for OSA/FCP thin interrupts (bit 67). */
 492         sprintf(dbf_text, "thini%1x",
 493                 (css_general_characteristics.aif_osa) ? 1 : 0);
 494         QDIO_DBF_TEXT0(0, setup, dbf_text);
 495
 496         /* Check for QEBSM support in general (bit 58). */
 497         sprintf(dbf_text, "cssQBS:%1x",
 498                 (qebsm_possible()) ? 1 : 0);
 499         QDIO_DBF_TEXT0(0, setup, dbf_text);
 500         return 0;
 501 }
 502
 503 void qdio_setup_exit(void)
 504 {
 505         kmem_cache_destroy(qdio_q_cache);
 506 }