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         spin_lock_init(&q->lock);
 121 }
 122
 123 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 124                                 void **sbals_array, int i)
 125 {
 126         struct qdio_q *prev;
 127         int j;
 128
 129         DBF_HEX(&q, sizeof(void *));
 130         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 131
 132         /* fill in sbal */
 133         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
 134                 q->sbal[j] = *sbals_array++;
 135                 WARN_ON((unsigned long)q->sbal[j] & 0xff);
 136         }
 137
 138         /* fill in slib */
 139         if (i > 0) {
 140                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 141                         : irq_ptr->output_qs[i - 1];
 142                 prev->slib->nsliba = (unsigned long)q->slib;
 143         }
 144
 145         q->slib->sla = (unsigned long)q->sl;
 146         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 147
 148         /* fill in sl */
 149         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 150                 q->sl->element[j].sbal = (unsigned long)q->sbal[j];
 151
 152         DBF_EVENT("sl-slsb-sbal");
 153         DBF_HEX(q->sl, sizeof(void *));
 154         DBF_HEX(&q->slsb, sizeof(void *));
 155         DBF_HEX(q->sbal, sizeof(void *));
 156 }
 157
 158 static void setup_queues(struct qdio_irq *irq_ptr,
 159                          struct qdio_initialize *qdio_init)
 160 {
 161         struct qdio_q *q;
 162         void **input_sbal_array = qdio_init->input_sbal_addr_array;
 163         void **output_sbal_array = qdio_init->output_sbal_addr_array;
 164         int i;
 165
 166         for_each_input_queue(irq_ptr, q, i) {
 167                 DBF_EVENT("in-q:%1d", i);
 168                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 169
 170                 q->is_input_q = 1;
 171                 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
 172                 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 173
 174                 if (is_thinint_irq(irq_ptr))
 175                         tasklet_init(&q->tasklet, tiqdio_inbound_processing,
 176                                      (unsigned long) q);
 177                 else
 178                         tasklet_init(&q->tasklet, qdio_inbound_processing,
 179                                      (unsigned long) q);
 180         }
 181
 182         for_each_output_queue(irq_ptr, q, i) {
 183                 DBF_EVENT("outq:%1d", i);
 184                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 185
 186                 q->is_input_q = 0;
 187                 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
 188                 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
 189
 190                 tasklet_init(&q->tasklet, qdio_outbound_processing,
 191                              (unsigned long) q);
 192                 setup_timer(&q->u.out.timer, (void(*)(unsigned long))
 193                             &qdio_outbound_timer, (unsigned long)q);
 194         }
 195 }
 196
 197 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
 198 {
 199         if (qdioac & AC1_SIGA_INPUT_NEEDED)
 200                 irq_ptr->siga_flag.input = 1;
 201         if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
 202                 irq_ptr->siga_flag.output = 1;
 203         if (qdioac & AC1_SIGA_SYNC_NEEDED)
 204                 irq_ptr->siga_flag.sync = 1;
 205         if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
 206                 irq_ptr->siga_flag.no_sync_ti = 1;
 207         if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
 208                 irq_ptr->siga_flag.no_sync_out_pci = 1;
 209
 210         if (irq_ptr->siga_flag.no_sync_out_pci &&
 211             irq_ptr->siga_flag.no_sync_ti)
 212                 irq_ptr->siga_flag.no_sync_out_ti = 1;
 213 }
 214
 215 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
 216                                   unsigned char qdioac, unsigned long token)
 217 {
 218         if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
 219                 goto no_qebsm;
 220         if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
 221             (!(qdioac & AC1_SC_QEBSM_ENABLED)))
 222                 goto no_qebsm;
 223
 224         irq_ptr->sch_token = token;
 225
 226         DBF_EVENT("V=V:1");
 227         DBF_EVENT("%8lx", irq_ptr->sch_token);
 228         return;
 229
 230 no_qebsm:
 231         irq_ptr->sch_token = 0;
 232         irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
 233         DBF_EVENT("noV=V");
 234 }
 235
 236 /*
 237  * If there is a qdio_irq we use the chsc_page and store the information
 238  * in the qdio_irq, otherwise we copy it to the specified structure.
 239  */
 240 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 241                         struct subchannel_id *schid,
 242                         struct qdio_ssqd_desc *data)
 243 {
 244         struct chsc_ssqd_area *ssqd;
 245         int rc;
 246
 247         DBF_EVENT("getssqd:%4x", schid->sch_no);
 248         if (irq_ptr != NULL)
 249                 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
 250         else
 251                 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
 252         memset(ssqd, 0, PAGE_SIZE);
 253
 254         ssqd->request = (struct chsc_header) {
 255                 .length = 0x0010,
 256                 .code   = 0x0024,
 257         };
 258         ssqd->first_sch = schid->sch_no;
 259         ssqd->last_sch = schid->sch_no;
 260         ssqd->ssid = schid->ssid;
 261
 262         if (chsc(ssqd))
 263                 return -EIO;
 264         rc = chsc_error_from_response(ssqd->response.code);
 265         if (rc)
 266                 return rc;
 267
 268         if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
 269             !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
 270             (ssqd->qdio_ssqd.sch != schid->sch_no))
 271                 return -EINVAL;
 272
 273         if (irq_ptr != NULL)
 274                 memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
 275                        sizeof(struct qdio_ssqd_desc));
 276         else {
 277                 memcpy(data, &ssqd->qdio_ssqd,
 278                        sizeof(struct qdio_ssqd_desc));
 279                 free_page((unsigned long)ssqd);
 280         }
 281         return 0;
 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, NULL);
 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("qdioac:%4x", qdioac);
 302 }
 303
 304 void qdio_release_memory(struct qdio_irq *irq_ptr)
 305 {
 306         struct qdio_q *q;
 307         int i;
 308
 309         /*
 310          * Must check queue array manually since irq_ptr->nr_input_queues /
 311          * irq_ptr->nr_input_queues may not yet be set.
 312          */
 313         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 314                 q = irq_ptr->input_qs[i];
 315                 if (q) {
 316                         free_page((unsigned long) q->slib);
 317                         kmem_cache_free(qdio_q_cache, q);
 318                 }
 319         }
 320         for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
 321                 q = irq_ptr->output_qs[i];
 322                 if (q) {
 323                         free_page((unsigned long) q->slib);
 324                         kmem_cache_free(qdio_q_cache, q);
 325                 }
 326         }
 327         free_page((unsigned long) irq_ptr->qdr);
 328         free_page(irq_ptr->chsc_page);
 329         free_page((unsigned long) irq_ptr);
 330 }
 331
 332 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
 333                                      struct qdio_q **irq_ptr_qs,
 334                                      int i, int nr)
 335 {
 336         irq_ptr->qdr->qdf0[i + nr].sliba =
 337                 (unsigned long)irq_ptr_qs[i]->slib;
 338
 339         irq_ptr->qdr->qdf0[i + nr].sla =
 340                 (unsigned long)irq_ptr_qs[i]->sl;
 341
 342         irq_ptr->qdr->qdf0[i + nr].slsba =
 343                 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
 344
 345         irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY;
 346         irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY;
 347         irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY;
 348         irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY;
 349 }
 350
 351 static void setup_qdr(struct qdio_irq *irq_ptr,
 352                       struct qdio_initialize *qdio_init)
 353 {
 354         int i;
 355
 356         irq_ptr->qdr->qfmt = qdio_init->q_format;
 357         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 358         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 359         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 360         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 361         irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
 362         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY;
 363
 364         for (i = 0; i < qdio_init->no_input_qs; i++)
 365                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
 366
 367         for (i = 0; i < qdio_init->no_output_qs; i++)
 368                 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
 369                                          qdio_init->no_input_qs);
 370 }
 371
 372 static void setup_qib(struct qdio_irq *irq_ptr,
 373                       struct qdio_initialize *init_data)
 374 {
 375         if (qebsm_possible())
 376                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 377
 378         irq_ptr->qib.qfmt = init_data->q_format;
 379         if (init_data->no_input_qs)
 380                 irq_ptr->qib.isliba =
 381                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 382         if (init_data->no_output_qs)
 383                 irq_ptr->qib.osliba =
 384                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 385         memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
 386 }
 387
 388 int qdio_setup_irq(struct qdio_initialize *init_data)
 389 {
 390         struct ciw *ciw;
 391         struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
 392         int rc;
 393
 394         memset(irq_ptr, 0, ((char *)&irq_ptr->qdr) - ((char *)irq_ptr));
 395         /* wipes qib.ac, required by ar7063 */
 396         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 397
 398         irq_ptr->int_parm = init_data->int_parm;
 399         irq_ptr->nr_input_qs = init_data->no_input_qs;
 400         irq_ptr->nr_output_qs = init_data->no_output_qs;
 401
 402         irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
 403         irq_ptr->cdev = init_data->cdev;
 404         setup_queues(irq_ptr, init_data);
 405
 406         setup_qib(irq_ptr, init_data);
 407         qdio_setup_thinint(irq_ptr);
 408         set_impl_params(irq_ptr, init_data->qib_param_field_format,
 409                         init_data->qib_param_field,
 410                         init_data->input_slib_elements,
 411                         init_data->output_slib_elements);
 412
 413         /* fill input and output descriptors */
 414         setup_qdr(irq_ptr, init_data);
 415
 416         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 417
 418         /* get qdio commands */
 419         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
 420         if (!ciw) {
 421                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 422                 rc = -EINVAL;
 423                 goto out_err;
 424         }
 425         irq_ptr->equeue = *ciw;
 426
 427         ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
 428         if (!ciw) {
 429                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 430                 rc = -EINVAL;
 431                 goto out_err;
 432         }
 433         irq_ptr->aqueue = *ciw;
 434
 435         /* set new interrupt handler */
 436         irq_ptr->orig_handler = init_data->cdev->handler;
 437         init_data->cdev->handler = qdio_int_handler;
 438         return 0;
 439 out_err:
 440         qdio_release_memory(irq_ptr);
 441         return rc;
 442 }
 443
 444 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 445                                 struct ccw_device *cdev)
 446 {
 447         char s[80];
 448
 449         snprintf(s, 80, "qdio: %s %s on SC %x using "
 450                  "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s%s\n",
 451                  dev_name(&cdev->dev),
 452                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 453                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 454                  irq_ptr->schid.sch_no,
 455                  is_thinint_irq(irq_ptr),
 456                  (irq_ptr->sch_token) ? 1 : 0,
 457                  (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
 458                  css_general_characteristics.aif_tdd,
 459                  (irq_ptr->siga_flag.input) ? "R" : " ",
 460                  (irq_ptr->siga_flag.output) ? "W" : " ",
 461                  (irq_ptr->siga_flag.sync) ? "S" : " ",
 462                  (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ",
 463                  (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ",
 464                  (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
 465         printk(KERN_INFO "%s", s);
 466 }
 467
 468 int __init qdio_setup_init(void)
 469 {
 470         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 471                                          256, 0, NULL);
 472         if (!qdio_q_cache)
 473                 return -ENOMEM;
 474
 475         /* Check for OSA/FCP thin interrupts (bit 67). */
 476         DBF_EVENT("thinint:%1d",
 477                   (css_general_characteristics.aif_osa) ? 1 : 0);
 478
 479         /* Check for QEBSM support in general (bit 58). */
 480         DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
 481         return 0;
 482 }
 483
 484 void qdio_setup_exit(void)
 485 {
 486         kmem_cache_destroy(qdio_q_cache);
 487 }