drivers/s390/cio/qdio_setup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * qdio queue initialization
   4  *
   5  * Copyright IBM Corp. 2008
   6  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/slab.h>
  10 #include <linux/export.h>
  11 #include <linux/io.h>
  12
  13 #include <asm/ebcdic.h>
  14 #include <asm/qdio.h>
  15
  16 #include "cio.h"
  17 #include "css.h"
  18 #include "device.h"
  19 #include "ioasm.h"
  20 #include "chsc.h"
  21 #include "qdio.h"
  22 #include "qdio_debug.h"
  23
  24 #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
  25
  26 static struct kmem_cache *qdio_q_cache;
  27 static struct kmem_cache *qdio_aob_cache;
  28
  29 struct qaob *qdio_allocate_aob(void)
  30 {
  31         return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
  32 }
  33 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
  34
  35 void qdio_release_aob(struct qaob *aob)
  36 {
  37         kmem_cache_free(qdio_aob_cache, aob);
  38 }
  39 EXPORT_SYMBOL_GPL(qdio_release_aob);
  40
  41 /**
  42  * qdio_free_buffers() - free qdio buffers
  43  * @buf: array of pointers to qdio buffers
  44  * @count: number of qdio buffers to free
  45  */
  46 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
  47 {
  48         int pos;
  49
  50         for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
  51                 free_page((unsigned long) buf[pos]);
  52 }
  53 EXPORT_SYMBOL_GPL(qdio_free_buffers);
  54
  55 /**
  56  * qdio_alloc_buffers() - allocate qdio buffers
  57  * @buf: array of pointers to qdio buffers
  58  * @count: number of qdio buffers to allocate
  59  */
  60 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
  61 {
  62         int pos;
  63
  64         for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
  65                 buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
  66                 if (!buf[pos]) {
  67                         qdio_free_buffers(buf, count);
  68                         return -ENOMEM;
  69                 }
  70         }
  71         for (pos = 0; pos < count; pos++)
  72                 if (pos % QBUFF_PER_PAGE)
  73                         buf[pos] = buf[pos - 1] + 1;
  74         return 0;
  75 }
  76 EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
  77
  78 /**
  79  * qdio_reset_buffers() - reset qdio buffers
  80  * @buf: array of pointers to qdio buffers
  81  * @count: number of qdio buffers that will be zeroed
  82  */
  83 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
  84 {
  85         int pos;
  86
  87         for (pos = 0; pos < count; pos++)
  88                 memset(buf[pos], 0, sizeof(struct qdio_buffer));
  89 }
  90 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
  91
  92 static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
  93 {
  94         struct qdio_q *q;
  95         unsigned int i;
  96
  97         for (i = 0; i < count; i++) {
  98                 q = queues[i];
  99                 free_page((unsigned long) q->slib);
 100                 kmem_cache_free(qdio_q_cache, q);
 101         }
 102 }
 103
 104 void qdio_free_queues(struct qdio_irq *irq_ptr)
 105 {
 106         __qdio_free_queues(irq_ptr->input_qs, irq_ptr->max_input_qs);
 107         irq_ptr->max_input_qs = 0;
 108
 109         __qdio_free_queues(irq_ptr->output_qs, irq_ptr->max_output_qs);
 110         irq_ptr->max_output_qs = 0;
 111 }
 112
 113 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
 114 {
 115         struct qdio_q *q;
 116         int i;
 117
 118         for (i = 0; i < nr_queues; i++) {
 119                 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
 120                 if (!q) {
 121                         __qdio_free_queues(irq_ptr_qs, i);
 122                         return -ENOMEM;
 123                 }
 124
 125                 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
 126                 if (!q->slib) {
 127                         kmem_cache_free(qdio_q_cache, q);
 128                         __qdio_free_queues(irq_ptr_qs, i);
 129                         return -ENOMEM;
 130                 }
 131                 irq_ptr_qs[i] = q;
 132         }
 133         return 0;
 134 }
 135
 136 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
 137 {
 138         int rc;
 139
 140         rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
 141         if (rc)
 142                 return rc;
 143
 144         rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
 145         if (rc) {
 146                 __qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
 147                 return rc;
 148         }
 149
 150         irq_ptr->max_input_qs = nr_input_qs;
 151         irq_ptr->max_output_qs = nr_output_qs;
 152         return 0;
 153 }
 154
 155 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
 156                               qdio_handler_t *handler, int i)
 157 {
 158         struct slib *slib = q->slib;
 159
 160         /* queue must be cleared for qdio_establish */
 161         memset(q, 0, sizeof(*q));
 162         memset(slib, 0, PAGE_SIZE);
 163         q->slib = slib;
 164         q->irq_ptr = irq_ptr;
 165         q->mask = 1 << (31 - i);
 166         q->nr = i;
 167         q->handler = handler;
 168 }
 169
 170 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
 171                                 struct qdio_buffer **sbals_array, int i)
 172 {
 173         struct qdio_q *prev;
 174         int j;
 175
 176         DBF_HEX(&q, sizeof(void *));
 177         q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
 178
 179         /* fill in sbal */
 180         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 181                 q->sbal[j] = *sbals_array++;
 182
 183         /* fill in slib */
 184         if (i > 0) {
 185                 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
 186                         : irq_ptr->output_qs[i - 1];
 187                 prev->slib->nsliba = (unsigned long)q->slib;
 188         }
 189
 190         q->slib->sla = (unsigned long)q->sl;
 191         q->slib->slsba = (unsigned long)&q->slsb.val[0];
 192
 193         /* fill in sl */
 194         for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
 195                 q->sl->element[j].sbal = virt_to_phys(q->sbal[j]);
 196 }
 197
 198 static void setup_queues(struct qdio_irq *irq_ptr,
 199                          struct qdio_initialize *qdio_init)
 200 {
 201         struct qdio_q *q;
 202         int i;
 203
 204         for_each_input_queue(irq_ptr, q, i) {
 205                 DBF_EVENT("inq:%1d", i);
 206                 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
 207
 208                 q->is_input_q = 1;
 209
 210                 setup_storage_lists(q, irq_ptr,
 211                                     qdio_init->input_sbal_addr_array[i], i);
 212         }
 213
 214         for_each_output_queue(irq_ptr, q, i) {
 215                 DBF_EVENT("outq:%1d", i);
 216                 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
 217
 218                 q->is_input_q = 0;
 219                 setup_storage_lists(q, irq_ptr,
 220                                     qdio_init->output_sbal_addr_array[i], i);
 221         }
 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         irq_ptr->qdioac1 = 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 static void qdio_fill_qdr_desc(struct qdesfmt0 *desc, struct qdio_q *queue)
 306 {
 307         desc->sliba = virt_to_phys(queue->slib);
 308         desc->sla = virt_to_phys(queue->sl);
 309         desc->slsba = virt_to_phys(&queue->slsb);
 310
 311         desc->akey = PAGE_DEFAULT_KEY >> 4;
 312         desc->bkey = PAGE_DEFAULT_KEY >> 4;
 313         desc->ckey = PAGE_DEFAULT_KEY >> 4;
 314         desc->dkey = PAGE_DEFAULT_KEY >> 4;
 315 }
 316
 317 static void setup_qdr(struct qdio_irq *irq_ptr,
 318                       struct qdio_initialize *qdio_init)
 319 {
 320         struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
 321         int i;
 322
 323         memset(irq_ptr->qdr, 0, sizeof(struct qdr));
 324
 325         irq_ptr->qdr->qfmt = qdio_init->q_format;
 326         irq_ptr->qdr->ac = qdio_init->qdr_ac;
 327         irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
 328         irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
 329         irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
 330         irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
 331         irq_ptr->qdr->qiba = virt_to_phys(&irq_ptr->qib);
 332         irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
 333
 334         for (i = 0; i < qdio_init->no_input_qs; i++)
 335                 qdio_fill_qdr_desc(desc++, irq_ptr->input_qs[i]);
 336
 337         for (i = 0; i < qdio_init->no_output_qs; i++)
 338                 qdio_fill_qdr_desc(desc++, irq_ptr->output_qs[i]);
 339 }
 340
 341 static void setup_qib(struct qdio_irq *irq_ptr,
 342                       struct qdio_initialize *init_data)
 343 {
 344         memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
 345
 346         irq_ptr->qib.qfmt = init_data->q_format;
 347         irq_ptr->qib.pfmt = init_data->qib_param_field_format;
 348
 349         irq_ptr->qib.rflags = init_data->qib_rflags;
 350         if (css_general_characteristics.qebsm)
 351                 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
 352
 353         if (init_data->no_input_qs)
 354                 irq_ptr->qib.isliba =
 355                         (unsigned long)(irq_ptr->input_qs[0]->slib);
 356         if (init_data->no_output_qs)
 357                 irq_ptr->qib.osliba =
 358                         (unsigned long)(irq_ptr->output_qs[0]->slib);
 359         memcpy(irq_ptr->qib.ebcnam, dev_name(&irq_ptr->cdev->dev), 8);
 360         ASCEBC(irq_ptr->qib.ebcnam, 8);
 361
 362         if (init_data->qib_param_field)
 363                 memcpy(irq_ptr->qib.parm, init_data->qib_param_field,
 364                        sizeof(irq_ptr->qib.parm));
 365 }
 366
 367 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
 368 {
 369         struct ccw_device *cdev = irq_ptr->cdev;
 370         struct ciw *ciw;
 371
 372         irq_ptr->qdioac1 = 0;
 373         memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
 374         memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
 375         memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
 376
 377         irq_ptr->debugfs_dev = NULL;
 378         irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
 379         irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
 380
 381         irq_ptr->int_parm = init_data->int_parm;
 382         irq_ptr->nr_input_qs = init_data->no_input_qs;
 383         irq_ptr->nr_output_qs = init_data->no_output_qs;
 384         ccw_device_get_schid(cdev, &irq_ptr->schid);
 385         setup_queues(irq_ptr, init_data);
 386
 387         irq_ptr->irq_poll = init_data->irq_poll;
 388         set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
 389
 390         setup_qib(irq_ptr, init_data);
 391
 392         /* fill input and output descriptors */
 393         setup_qdr(irq_ptr, init_data);
 394
 395         /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
 396
 397         /* set our IRQ handler */
 398         spin_lock_irq(get_ccwdev_lock(cdev));
 399         irq_ptr->orig_handler = cdev->handler;
 400         cdev->handler = qdio_int_handler;
 401         spin_unlock_irq(get_ccwdev_lock(cdev));
 402
 403         /* get qdio commands */
 404         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
 405         if (!ciw) {
 406                 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
 407                 return -EINVAL;
 408         }
 409         irq_ptr->equeue = *ciw;
 410
 411         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
 412         if (!ciw) {
 413                 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
 414                 return -EINVAL;
 415         }
 416         irq_ptr->aqueue = *ciw;
 417
 418         return 0;
 419 }
 420
 421 void qdio_shutdown_irq(struct qdio_irq *irq)
 422 {
 423         struct ccw_device *cdev = irq->cdev;
 424
 425         /* restore IRQ handler */
 426         spin_lock_irq(get_ccwdev_lock(cdev));
 427         cdev->handler = irq->orig_handler;
 428         cdev->private->intparm = 0;
 429         spin_unlock_irq(get_ccwdev_lock(cdev));
 430 }
 431
 432 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
 433 {
 434         dev_info(&irq_ptr->cdev->dev,
 435                  "qdio: %s on SC %x using AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s\n",
 436                  (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
 437                         ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
 438                  irq_ptr->schid.sch_no,
 439                  is_thinint_irq(irq_ptr),
 440                  (irq_ptr->sch_token) ? 1 : 0,
 441                  pci_out_supported(irq_ptr) ? 1 : 0,
 442                  css_general_characteristics.aif_tdd,
 443                  qdio_need_siga_in(irq_ptr) ? "R" : " ",
 444                  qdio_need_siga_out(irq_ptr) ? "W" : " ",
 445                  qdio_need_siga_sync(irq_ptr) ? "S" : " ");
 446 }
 447
 448 int __init qdio_setup_init(void)
 449 {
 450         int rc;
 451
 452         qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
 453                                          256, 0, NULL);
 454         if (!qdio_q_cache)
 455                 return -ENOMEM;
 456
 457         qdio_aob_cache = kmem_cache_create("qdio_aob",
 458                                         sizeof(struct qaob),
 459                                         sizeof(struct qaob),
 460                                         0,
 461                                         NULL);
 462         if (!qdio_aob_cache) {
 463                 rc = -ENOMEM;
 464                 goto free_qdio_q_cache;
 465         }
 466
 467         /* Check for OSA/FCP thin interrupts (bit 67). */
 468         DBF_EVENT("thinint:%1d",
 469                   (css_general_characteristics.aif_osa) ? 1 : 0);
 470
 471         /* Check for QEBSM support in general (bit 58). */
 472         DBF_EVENT("cssQEBSM:%1d", css_general_characteristics.qebsm);
 473         rc = 0;
 474 out:
 475         return rc;
 476 free_qdio_q_cache:
 477         kmem_cache_destroy(qdio_q_cache);
 478         goto out;
 479 }
 480
 481 void qdio_setup_exit(void)
 482 {
 483         kmem_cache_destroy(qdio_aob_cache);
 484         kmem_cache_destroy(qdio_q_cache);
 485 }