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, int i)
 124 {
 125         struct qdio_q *prev;
 126         int j;
 127
 128         DBF_HEX(&q, sizeof(void *));
 129         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 130
 131         /* fill in sbal */
 132         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 133                 q->sbal[j] = *sbals_array++;
 134                 WARN_ON((unsigned long)q->sbal[j] & 0xff);
 135         }
 136
 137         /* fill in slib */
 138         if (i > 0) {
 139                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 140                         : irq_ptr->output_qs[i - 1];
 141                 prev->slib->nsliba = (unsigned long)q->slib;
 142         }
 143
 144         q->slib->sla = (unsigned long)q->sl;
 145         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 146
 147         /* fill in sl */
 148         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 149                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 150
 151         DBF_EVENT("sl-slsb-sbal");
 152         DBF_HEX(q->sl, sizeof(void *));
 153         DBF_HEX(&q->slsb, sizeof(void *));
 154         DBF_HEX(q->sbal, sizeof(void *));
 155 }
 156
 157 static void setup_queues(struct qdio_irq *irq_ptr,
 158                          struct qdio_initialize *qdio_init)
 159 {
 160         struct qdio_q *q;
 161         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 162         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 163         int i;
 164
 165         for_each_input_queue(irq_ptr, q, i) {
 166                 DBF_EVENT("in-q:%1d", i);
 167                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 168
 169                 q->is_input_q = 1;
 170                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 171                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 172
 173                 if (is_thinint_irq(irq_ptr))
 174                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 175                                      (unsigned long) q);
 176                 else
 177                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 178                                      (unsigned long) q);
 179         }
 180
 181         for_each_output_queue(irq_ptr, q, i) {
 182                 DBF_EVENT("outq:%1d", i);
 183                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 184
 185                 q->is_input_q = 0;
 186                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 187                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 188
 189                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 190                              (unsigned long) q);
 191                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 192                             &qdio_outbound_timer, (unsigned long)q);
 193         }
 194 }
 195
 196 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 197 {
 198         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 199                 irq_ptr->siga_flag.input = 1;
 200         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 201                 irq_ptr->siga_flag.output = 1;
 202         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 203                 irq_ptr->siga_flag.sync = 1;
 204         if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
 205                 irq_ptr->siga_flag.no_sync_ti = 1;
 206         if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
 207                 irq_ptr->siga_flag.no_sync_out_pci = 1;
 208
 209         if (irq_ptr->siga_flag.no_sync_out_pci &&
 210             irq_ptr->siga_flag.no_sync_ti)
 211                 irq_ptr->siga_flag.no_sync_out_ti = 1;
 212 }
 213
 214 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 215                                   unsigned char qdioac, unsigned long token)
 216 {
 217         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 218                 goto no_qebsm;
 219         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 220             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 221                 goto no_qebsm;
 222
 223         irq_ptr->sch_token = token;
 224
 225         DBF_EVENT("V=V:1");
 226         DBF_EVENT("%8lx", irq_ptr->sch_token);
 227         return;
 228
 229 no_qebsm:
 230         irq_ptr->sch_token = 0;
 231         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 232         DBF_EVENT("noV=V");
 233 }
 234
 235 /*
 236  * If there is a qdio_irq we use the chsc_page and store the information
 237  * in the qdio_irq, otherwise we copy it to the specified structure.
 238  */
 239 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 240                         struct subchannel_id *schid,
 241                         struct qdio_ssqd_desc *data)
 242 {
 243         struct chsc_ssqd_area *ssqd;
 244         int rc;
 245
 246         DBF_EVENT("getssqd:%4x", schid->sch_no);
 247         if (irq_ptr != NULL)
 248                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 249         else
 250                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 251         memset(ssqd, 0, PAGE_SIZE);
 252
 253         ssqd->request = (struct chsc_header) {
 254                 .length = 0x0010,
 255                 .code   = 0x0024,
 256         };
 257         ssqd->first_sch = schid->sch_no;
 258         ssqd->last_sch = schid->sch_no;
 259         ssqd->ssid = schid->ssid;
 260
 261         if (chsc(ssqd))
 262                 return -EIO;
 263         rc = chsc_error_from_response(ssqd->response.code);
 264         if (rc)
 265                 return rc;
 266
 267         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 268             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 269             (ssqd->qdio_ssqd.sch != schid->sch_no))
 270                 return -EINVAL;
 271
 272         if (irq_ptr != NULL)
 273                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 274                        sizeof(struct qdio_ssqd_desc));
 275         else {
 276                 memcpy(data, &ssqd->qdio_ssqd,
 277                        sizeof(struct qdio_ssqd_desc));
 278                 free_page((unsigned long)ssqd);
 279         }
 280         return 0;
 281 }
 282
 283 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 284 {
 285         unsigned char qdioac;
 286         int rc;
 287
 288         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
 289         if (rc) {
 290                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 291                 DBF_ERROR("rc:%x", rc);
 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         DBF_EVENT("qdioac:%4x", qdioac);
 301 }
 302
 303 void qdio_release_memory(struct qdio_irq *irq_ptr)
 304 {
 305         struct qdio_q *q;
 306         int i;
 307
 308         /*
 309          * Must check queue array manually since irq_ptr->nr_input_queues /
 310          * irq_ptr->nr_input_queues may not yet be set.
 311          */
 312         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 313                 q = irq_ptr->input_qs[i];
 314                 if (q) {
 315                         free_page((unsigned long) q->slib);
 316                         kmem_cache_free(qdio_q_cache, q);
 317                 }
 318         }
 319         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 320                 q = irq_ptr->output_qs[i];
 321                 if (q) {
 322                         free_page((unsigned long) q->slib);
 323                         kmem_cache_free(qdio_q_cache, q);
 324                 }
 325         }
 326         free_page((unsigned long) irq_ptr->qdr);
 327         free_page(irq_ptr->chsc_page);
 328         free_page((unsigned long) irq_ptr);
 329 }
 330
 331 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 332                                      struct qdio_q **irq_ptr_qs,
 333                                      int i, int nr)
 334 {
 335         irq_ptr->qdr->qdf0[i + nr].sliba =
 336                 (unsigned long)irq_ptr_qs[i]->slib;
 337
 338         irq_ptr->qdr->qdf0[i + nr].sla =
 339                 (unsigned long)irq_ptr_qs[i]->sl;
 340
 341         irq_ptr->qdr->qdf0[i + nr].slsba =
 342                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 343
 344         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY;
 345         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY;
 346         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY;
 347         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY;
 348 }
 349
 350 static void setup_qdr(struct qdio_irq *irq_ptr,
 351                       struct qdio_initialize *qdio_init)
 352 {
 353         int i;
 354
 355         irq_ptr->qdr->qfmt = qdio_init->q_format;
 356         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 357         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 358         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 359         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 360         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 361         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY;
 362
 363         for (i = 0; i < qdio_init->no_input_qs; i++)
 364                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 365
 366         for (i = 0; i < qdio_init->no_output_qs; i++)
 367                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 368                                          qdio_init->no_input_qs);
 369 }
 370
 371 static void setup_qib(struct qdio_irq *irq_ptr,
 372                       struct qdio_initialize *init_data)
 373 {
 374         if (qebsm_possible())
 375                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 376
 377         irq_ptr->qib.qfmt = init_data->q_format;
 378         if (init_data->no_input_qs)
 379                 irq_ptr->qib.isliba =
 380                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 381         if (init_data->no_output_qs)
 382                 irq_ptr->qib.osliba =
 383                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 384         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 385 }
 386
 387 int qdio_setup_irq(struct qdio_initialize *init_data)
 388 {
 389         struct ciw *ciw;
 390         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 391         int rc;
 392
 393         memset(irq_ptr, 0, ((char *)&irq_ptr->qdr) - ((char *)irq_ptr));
 394         /* wipes qib.ac, required by ar7063 */
 395         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 396
 397         irq_ptr->int_parm = init_data->int_parm;
 398         irq_ptr->nr_input_qs = init_data->no_input_qs;
 399         irq_ptr->nr_output_qs = init_data->no_output_qs;
 400
 401         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 402         irq_ptr->cdev = init_data->cdev;
 403         setup_queues(irq_ptr, init_data);
 404
 405         setup_qib(irq_ptr, init_data);
 406         qdio_setup_thinint(irq_ptr);
 407         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 408                         init_data->qib_param_field,
 409                         init_data->input_slib_elements,
 410                         init_data->output_slib_elements);
 411
 412         /* fill input and output descriptors */
 413         setup_qdr(irq_ptr, init_data);
 414
 415         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 416
 417         /* get qdio commands */
 418         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 419         if (!ciw) {
 420                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 421                 rc = -EINVAL;
 422                 goto out_err;
 423         }
 424         irq_ptr->equeue = *ciw;
 425
 426         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 427         if (!ciw) {
 428                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 429                 rc = -EINVAL;
 430                 goto out_err;
 431         }
 432         irq_ptr->aqueue = *ciw;
 433
 434         /* set new interrupt handler */
 435         irq_ptr->orig_handler = init_data->cdev->handler;
 436         init_data->cdev->handler = qdio_int_handler;
 437         return 0;
 438 out_err:
 439         qdio_release_memory(irq_ptr);
 440         return rc;
 441 }
 442
 443 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 444                                 struct ccw_device *cdev)
 445 {
 446         char s[80];
 447
 448         snprintf(s, 80, "qdio: %s %s on SC %x using "
 449                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s%s\n",
 450                  dev_name(&cdev->dev),
 451                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 452                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 453                  irq_ptr->schid.sch_no,
 454                  is_thinint_irq(irq_ptr),
 455                  (irq_ptr->sch_token) ? 1 : 0,
 456                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 457                  css_general_characteristics.aif_tdd,
 458                  (irq_ptr->siga_flag.input) ? "R" : " ",
 459                  (irq_ptr->siga_flag.output) ? "W" : " ",
 460                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 461                  (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ",
 462                  (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ",
 463                  (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
 464         printk(KERN_INFO "%s", s);
 465 }
 466
 467 int __init qdio_setup_init(void)
 468 {
 469         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 470                                          256, 0, NULL);
 471         if (!qdio_q_cache)
 472                 return -ENOMEM;
 473
 474         /* Check for OSA/FCP thin interrupts (bit 67). */
 475         DBF_EVENT("thinint:%1d",
 476                   (css_general_characteristics.aif_osa) ? 1 : 0);
 477
 478         /* Check for QEBSM support in general (bit 58). */
 479         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 480         return 0;
 481 }
 482
 483 void qdio_setup_exit(void)
 484 {
 485         kmem_cache_destroy(qdio_q_cache);
 486 }