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         irq_ptr->qib.pfmt = qib_param_field_format;
  52         if (qib_param_field)
  53                 memcpy(irq_ptr->qib.parm, qib_param_field,
  54                        QDIO_MAX_BUFFERS_PER_Q);
  55
  56         if (!input_slib_elements)
  57                 goto output;
  58
  59         for_each_input_queue(irq_ptr, q, i) {
  60                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  61                         q->slib->slibe[j].parms =
  62                                 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  63         }
  64 output:
  65         if (!output_slib_elements)
  66                 return;
  67
  68         for_each_output_queue(irq_ptr, q, i) {
  69                 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
  70                         q->slib->slibe[j].parms =
  71                                 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
  72         }
  73 }
  74
  75 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
  76 {
  77         struct qdio_q *q;
  78         int i;
  79
  80         for (i = 0; i < nr_queues; i++) {
  81                 q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
  82                 if (!q)
  83                         return -ENOMEM;
  84
  85                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
  86                 if (!q->slib) {
  87                         kmem_cache_free(qdio_q_cache, q);
  88                         return -ENOMEM;
  89                 }
  90                 irq_ptr_qs[i] = q;
  91         }
  92         return 0;
  93 }
  94
  95 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
  96 {
  97         int rc;
  98
  99         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 100         if (rc)
 101                 return rc;
 102         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 103         return rc;
 104 }
 105
 106 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 107                               qdio_handler_t *handler, int i)
 108 {
 109         struct slib *slib = q->slib;
 110
 111         /* queue must be cleared for qdio_establish */
 112         memset(q, 0, sizeof(*q));
 113         memset(slib, 0, PAGE_SIZE);
 114         q->slib = slib;
 115         q->irq_ptr = irq_ptr;
 116         q->mask = 1 << (31 - i);
 117         q->nr = i;
 118         q->handler = handler;
 119 }
 120
 121 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 122                                 void **sbals_array, int i)
 123 {
 124         struct qdio_q *prev;
 125         int j;
 126
 127         DBF_HEX(&q, sizeof(void *));
 128         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 129
 130         /* fill in sbal */
 131         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 132                 q->sbal[j] = *sbals_array++;
 133                 BUG_ON((unsigned long)q->sbal[j] & 0xff);
 134         }
 135
 136         /* fill in slib */
 137         if (i > 0) {
 138                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 139                         : irq_ptr->output_qs[i - 1];
 140                 prev->slib->nsliba = (unsigned long)q->slib;
 141         }
 142
 143         q->slib->sla = (unsigned long)q->sl;
 144         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 145
 146         /* fill in sl */
 147         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 148                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 149 }
 150
 151 static void setup_queues(struct qdio_irq *irq_ptr,
 152                          struct qdio_initialize *qdio_init)
 153 {
 154         struct qdio_q *q;
 155         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 156         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 157         int i;
 158
 159         for_each_input_queue(irq_ptr, q, i) {
 160                 DBF_EVENT("in-q:%1d", i);
 161                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 162
 163                 q->is_input_q = 1;
 164                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 165                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 166
 167                 if (is_thinint_irq(irq_ptr))
 168                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 169                                      (unsigned long) q);
 170                 else
 171                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 172                                      (unsigned long) q);
 173         }
 174
 175         for_each_output_queue(irq_ptr, q, i) {
 176                 DBF_EVENT("outq:%1d", i);
 177                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 178
 179                 q->is_input_q = 0;
 180                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 181                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 182
 183                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 184                              (unsigned long) q);
 185                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 186                             &qdio_outbound_timer, (unsigned long)q);
 187         }
 188 }
 189
 190 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 191 {
 192         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 193                 irq_ptr->siga_flag.input = 1;
 194         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 195                 irq_ptr->siga_flag.output = 1;
 196         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 197                 irq_ptr->siga_flag.sync = 1;
 198         if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
 199                 irq_ptr->siga_flag.no_sync_ti = 1;
 200         if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
 201                 irq_ptr->siga_flag.no_sync_out_pci = 1;
 202
 203         if (irq_ptr->siga_flag.no_sync_out_pci &&
 204             irq_ptr->siga_flag.no_sync_ti)
 205                 irq_ptr->siga_flag.no_sync_out_ti = 1;
 206 }
 207
 208 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 209                                   unsigned char qdioac, unsigned long token)
 210 {
 211         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 212                 goto no_qebsm;
 213         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 214             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 215                 goto no_qebsm;
 216
 217         irq_ptr->sch_token = token;
 218
 219         DBF_EVENT("V=V:1");
 220         DBF_EVENT("%8lx", irq_ptr->sch_token);
 221         return;
 222
 223 no_qebsm:
 224         irq_ptr->sch_token = 0;
 225         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 226         DBF_EVENT("noV=V");
 227 }
 228
 229 /*
 230  * If there is a qdio_irq we use the chsc_page and store the information
 231  * in the qdio_irq, otherwise we copy it to the specified structure.
 232  */
 233 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 234                         struct subchannel_id *schid,
 235                         struct qdio_ssqd_desc *data)
 236 {
 237         struct chsc_ssqd_area *ssqd;
 238         int rc;
 239
 240         DBF_EVENT("getssqd:%4x", schid->sch_no);
 241         if (irq_ptr != NULL)
 242                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 243         else
 244                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 245         memset(ssqd, 0, PAGE_SIZE);
 246
 247         ssqd->request = (struct chsc_header) {
 248                 .length = 0x0010,
 249                 .code   = 0x0024,
 250         };
 251         ssqd->first_sch = schid->sch_no;
 252         ssqd->last_sch = schid->sch_no;
 253         ssqd->ssid = schid->ssid;
 254
 255         if (chsc(ssqd))
 256                 return -EIO;
 257         rc = chsc_error_from_response(ssqd->response.code);
 258         if (rc)
 259                 return rc;
 260
 261         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 262             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 263             (ssqd->qdio_ssqd.sch != schid->sch_no))
 264                 return -EINVAL;
 265
 266         if (irq_ptr != NULL)
 267                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 268                        sizeof(struct qdio_ssqd_desc));
 269         else {
 270                 memcpy(data, &ssqd->qdio_ssqd,
 271                        sizeof(struct qdio_ssqd_desc));
 272                 free_page((unsigned long)ssqd);
 273         }
 274         return 0;
 275 }
 276
 277 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
 278 {
 279         unsigned char qdioac;
 280         int rc;
 281
 282         rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
 283         if (rc) {
 284                 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
 285                 DBF_ERROR("rc:%x", rc);
 286                 /* all flags set, worst case */
 287                 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
 288                          AC1_SIGA_SYNC_NEEDED;
 289         } else
 290                 qdioac = irq_ptr->ssqd_desc.qdioac1;
 291
 292         check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
 293         process_ac_flags(irq_ptr, qdioac);
 294         DBF_EVENT("qdioac:%4x", qdioac);
 295 }
 296
 297 void qdio_release_memory(struct qdio_irq *irq_ptr)
 298 {
 299         struct qdio_q *q;
 300         int i;
 301
 302         /*
 303          * Must check queue array manually since irq_ptr->nr_input_queues /
 304          * irq_ptr->nr_input_queues may not yet be set.
 305          */
 306         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 307                 q = irq_ptr->input_qs[i];
 308                 if (q) {
 309                         free_page((unsigned long) q->slib);
 310                         kmem_cache_free(qdio_q_cache, q);
 311                 }
 312         }
 313         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 314                 q = irq_ptr->output_qs[i];
 315                 if (q) {
 316                         free_page((unsigned long) q->slib);
 317                         kmem_cache_free(qdio_q_cache, q);
 318                 }
 319         }
 320         free_page((unsigned long) irq_ptr->qdr);
 321         free_page(irq_ptr->chsc_page);
 322         free_page((unsigned long) irq_ptr);
 323 }
 324
 325 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 326                                      struct qdio_q **irq_ptr_qs,
 327                                      int i, int nr)
 328 {
 329         irq_ptr->qdr->qdf0[i + nr].sliba =
 330                 (unsigned long)irq_ptr_qs[i]->slib;
 331
 332         irq_ptr->qdr->qdf0[i + nr].sla =
 333                 (unsigned long)irq_ptr_qs[i]->sl;
 334
 335         irq_ptr->qdr->qdf0[i + nr].slsba =
 336                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 337
 338         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
 339         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
 340         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
 341         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
 342 }
 343
 344 static void setup_qdr(struct qdio_irq *irq_ptr,
 345                       struct qdio_initialize *qdio_init)
 346 {
 347         int i;
 348
 349         irq_ptr->qdr->qfmt = qdio_init->q_format;
 350         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 351         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 352         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 353         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 354         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 355         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 356
 357         for (i = 0; i < qdio_init->no_input_qs; i++)
 358                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 359
 360         for (i = 0; i < qdio_init->no_output_qs; i++)
 361                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 362                                          qdio_init->no_input_qs);
 363 }
 364
 365 static void setup_qib(struct qdio_irq *irq_ptr,
 366                       struct qdio_initialize *init_data)
 367 {
 368         if (qebsm_possible())
 369                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 370
 371         irq_ptr->qib.qfmt = init_data->q_format;
 372         if (init_data->no_input_qs)
 373                 irq_ptr->qib.isliba =
 374                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 375         if (init_data->no_output_qs)
 376                 irq_ptr->qib.osliba =
 377                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 378         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 379 }
 380
 381 int qdio_setup_irq(struct qdio_initialize *init_data)
 382 {
 383         struct ciw *ciw;
 384         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 385         int rc;
 386
 387         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 388         memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
 389         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 390         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 391         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 392
 393         irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
 394         irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
 395
 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                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 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                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 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         snprintf(s, 80, "qdio: %s %s on SC %x using "
 451                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s%s\n",
 452                  dev_name(&cdev->dev),
 453                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 454                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 455                  irq_ptr->schid.sch_no,
 456                  is_thinint_irq(irq_ptr),
 457                  (irq_ptr->sch_token) ? 1 : 0,
 458                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 459                  css_general_characteristics.aif_tdd,
 460                  (irq_ptr->siga_flag.input) ? "R" : " ",
 461                  (irq_ptr->siga_flag.output) ? "W" : " ",
 462                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 463                  (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ",
 464                  (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ",
 465                  (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
 466         printk(KERN_INFO "%s", s);
 467 }
 468
 469 int __init qdio_setup_init(void)
 470 {
 471         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 472                                          256, 0, NULL);
 473         if (!qdio_q_cache)
 474                 return -ENOMEM;
 475
 476         /* Check for OSA/FCP thin interrupts (bit 67). */
 477         DBF_EVENT("thinint:%1d",
 478                   (css_general_characteristics.aif_osa) ? 1 : 0);
 479
 480         /* Check for QEBSM support in general (bit 58). */
 481         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 482         return 0;
 483 }
 484
 485 void qdio_setup_exit(void)
 486 {
 487         kmem_cache_destroy(qdio_q_cache);
 488 }