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 <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 #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer)) 22 23 static struct kmem_cache *qdio_q_cache; 24 static struct kmem_cache *qdio_aob_cache; 25 26 struct qaob *qdio_allocate_aob(void) 27 { 28 return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC); 29 } 30 31 void qdio_release_aob(struct qaob *aob) 32 { 33 kmem_cache_free(qdio_aob_cache, aob); 34 } 35 EXPORT_SYMBOL_GPL(qdio_release_aob); 36 37 /** 38 * qdio_free_buffers() - free qdio buffers 39 * @buf: array of pointers to qdio buffers 40 * @count: number of qdio buffers to free 41 */ 42 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count) 43 { 44 int pos; 45 46 for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) 47 free_page((unsigned long) buf[pos]); 48 } 49 EXPORT_SYMBOL_GPL(qdio_free_buffers); 50 51 /** 52 * qdio_alloc_buffers() - allocate qdio buffers 53 * @buf: array of pointers to qdio buffers 54 * @count: number of qdio buffers to allocate 55 */ 56 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count) 57 { 58 int pos; 59 60 for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) { 61 buf[pos] = (void *) get_zeroed_page(GFP_KERNEL); 62 if (!buf[pos]) { 63 qdio_free_buffers(buf, count); 64 return -ENOMEM; 65 } 66 } 67 for (pos = 0; pos < count; pos++) 68 if (pos % QBUFF_PER_PAGE) 69 buf[pos] = buf[pos - 1] + 1; 70 return 0; 71 } 72 EXPORT_SYMBOL_GPL(qdio_alloc_buffers); 73 74 /** 75 * qdio_reset_buffers() - reset qdio buffers 76 * @buf: array of pointers to qdio buffers 77 * @count: number of qdio buffers that will be zeroed 78 */ 79 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count) 80 { 81 int pos; 82 83 for (pos = 0; pos < count; pos++) 84 memset(buf[pos], 0, sizeof(struct qdio_buffer)); 85 } 86 EXPORT_SYMBOL_GPL(qdio_reset_buffers); 87 88 /* 89 * qebsm is only available under 64bit but the adapter sets the feature 90 * flag anyway, so we manually override it. 91 */ 92 static inline int qebsm_possible(void) 93 { 94 return css_general_characteristics.qebsm; 95 } 96 97 /* 98 * qib_param_field: pointer to 128 bytes or NULL, if no param field 99 * nr_input_qs: pointer to nr_queues*128 words of data or NULL 100 */ 101 static void set_impl_params(struct qdio_irq *irq_ptr, 102 unsigned int qib_param_field_format, 103 unsigned char *qib_param_field, 104 unsigned long *input_slib_elements, 105 unsigned long *output_slib_elements) 106 { 107 struct qdio_q *q; 108 int i, j; 109 110 if (!irq_ptr) 111 return; 112 113 irq_ptr->qib.pfmt = qib_param_field_format; 114 if (qib_param_field) 115 memcpy(irq_ptr->qib.parm, qib_param_field, 116 sizeof(irq_ptr->qib.parm)); 117 118 if (!input_slib_elements) 119 goto output; 120 121 for_each_input_queue(irq_ptr, q, i) { 122 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) 123 q->slib->slibe[j].parms = 124 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j]; 125 } 126 output: 127 if (!output_slib_elements) 128 return; 129 130 for_each_output_queue(irq_ptr, q, i) { 131 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) 132 q->slib->slibe[j].parms = 133 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j]; 134 } 135 } 136 137 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues) 138 { 139 struct qdio_q *q; 140 int i; 141 142 for (i = 0; i < nr_queues; i++) { 143 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL); 144 if (!q) 145 return -ENOMEM; 146 147 q->slib = (struct slib *) __get_free_page(GFP_KERNEL); 148 if (!q->slib) { 149 kmem_cache_free(qdio_q_cache, q); 150 return -ENOMEM; 151 } 152 irq_ptr_qs[i] = q; 153 INIT_LIST_HEAD(&q->entry); 154 } 155 return 0; 156 } 157 158 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs) 159 { 160 int rc; 161 162 rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs); 163 if (rc) 164 return rc; 165 rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs); 166 return rc; 167 } 168 169 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr, 170 qdio_handler_t *handler, int i) 171 { 172 struct slib *slib = q->slib; 173 174 /* queue must be cleared for qdio_establish */ 175 memset(q, 0, sizeof(*q)); 176 memset(slib, 0, PAGE_SIZE); 177 q->slib = slib; 178 q->irq_ptr = irq_ptr; 179 q->mask = 1 << (31 - i); 180 q->nr = i; 181 q->handler = handler; 182 INIT_LIST_HEAD(&q->entry); 183 } 184 185 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr, 186 struct qdio_buffer **sbals_array, int i) 187 { 188 struct qdio_q *prev; 189 int j; 190 191 DBF_HEX(&q, sizeof(void *)); 192 q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2); 193 194 /* fill in sbal */ 195 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) 196 q->sbal[j] = *sbals_array++; 197 198 /* fill in slib */ 199 if (i > 0) { 200 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1] 201 : irq_ptr->output_qs[i - 1]; 202 prev->slib->nsliba = (unsigned long)q->slib; 203 } 204 205 q->slib->sla = (unsigned long)q->sl; 206 q->slib->slsba = (unsigned long)&q->slsb.val[0]; 207 208 /* fill in sl */ 209 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) 210 q->sl->element[j].sbal = (unsigned long)q->sbal[j]; 211 } 212 213 static void setup_queues(struct qdio_irq *irq_ptr, 214 struct qdio_initialize *qdio_init) 215 { 216 struct qdio_q *q; 217 struct qdio_buffer **input_sbal_array = qdio_init->input_sbal_addr_array; 218 struct qdio_buffer **output_sbal_array = qdio_init->output_sbal_addr_array; 219 struct qdio_outbuf_state *output_sbal_state_array = 220 qdio_init->output_sbal_state_array; 221 int i; 222 223 for_each_input_queue(irq_ptr, q, i) { 224 DBF_EVENT("inq:%1d", i); 225 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i); 226 227 q->is_input_q = 1; 228 q->u.in.queue_start_poll = qdio_init->queue_start_poll_array ? 229 qdio_init->queue_start_poll_array[i] : NULL; 230 231 setup_storage_lists(q, irq_ptr, input_sbal_array, i); 232 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q; 233 234 if (is_thinint_irq(irq_ptr)) { 235 tasklet_init(&q->tasklet, tiqdio_inbound_processing, 236 (unsigned long) q); 237 } else { 238 tasklet_init(&q->tasklet, qdio_inbound_processing, 239 (unsigned long) q); 240 } 241 } 242 243 for_each_output_queue(irq_ptr, q, i) { 244 DBF_EVENT("outq:%1d", i); 245 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i); 246 247 q->u.out.sbal_state = output_sbal_state_array; 248 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q; 249 250 q->is_input_q = 0; 251 setup_storage_lists(q, irq_ptr, output_sbal_array, i); 252 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q; 253 254 tasklet_init(&q->tasklet, qdio_outbound_processing, 255 (unsigned long) q); 256 timer_setup(&q->u.out.timer, qdio_outbound_timer, 0); 257 } 258 } 259 260 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac) 261 { 262 if (qdioac & AC1_SIGA_INPUT_NEEDED) 263 irq_ptr->siga_flag.input = 1; 264 if (qdioac & AC1_SIGA_OUTPUT_NEEDED) 265 irq_ptr->siga_flag.output = 1; 266 if (qdioac & AC1_SIGA_SYNC_NEEDED) 267 irq_ptr->siga_flag.sync = 1; 268 if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)) 269 irq_ptr->siga_flag.sync_after_ai = 1; 270 if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)) 271 irq_ptr->siga_flag.sync_out_after_pci = 1; 272 } 273 274 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr, 275 unsigned char qdioac, unsigned long token) 276 { 277 if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM)) 278 goto no_qebsm; 279 if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) || 280 (!(qdioac & AC1_SC_QEBSM_ENABLED))) 281 goto no_qebsm; 282 283 irq_ptr->sch_token = token; 284 285 DBF_EVENT("V=V:1"); 286 DBF_EVENT("%8lx", irq_ptr->sch_token); 287 return; 288 289 no_qebsm: 290 irq_ptr->sch_token = 0; 291 irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM; 292 DBF_EVENT("noV=V"); 293 } 294 295 /* 296 * If there is a qdio_irq we use the chsc_page and store the information 297 * in the qdio_irq, otherwise we copy it to the specified structure. 298 */ 299 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr, 300 struct subchannel_id *schid, 301 struct qdio_ssqd_desc *data) 302 { 303 struct chsc_ssqd_area *ssqd; 304 int rc; 305 306 DBF_EVENT("getssqd:%4x", schid->sch_no); 307 if (!irq_ptr) { 308 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL); 309 if (!ssqd) 310 return -ENOMEM; 311 } else { 312 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page; 313 } 314 315 rc = chsc_ssqd(*schid, ssqd); 316 if (rc) 317 goto out; 318 319 if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) || 320 !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) || 321 (ssqd->qdio_ssqd.sch != schid->sch_no)) 322 rc = -EINVAL; 323 324 if (!rc) 325 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data)); 326 327 out: 328 if (!irq_ptr) 329 free_page((unsigned long)ssqd); 330 331 return rc; 332 } 333 334 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr) 335 { 336 unsigned char qdioac; 337 int rc; 338 339 rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc); 340 if (rc) { 341 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no); 342 DBF_ERROR("rc:%x", rc); 343 /* all flags set, worst case */ 344 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED | 345 AC1_SIGA_SYNC_NEEDED; 346 } else 347 qdioac = irq_ptr->ssqd_desc.qdioac1; 348 349 check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token); 350 process_ac_flags(irq_ptr, qdioac); 351 DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2); 352 DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac); 353 } 354 355 void qdio_release_memory(struct qdio_irq *irq_ptr) 356 { 357 struct qdio_q *q; 358 int i; 359 360 /* 361 * Must check queue array manually since irq_ptr->nr_input_queues / 362 * irq_ptr->nr_input_queues may not yet be set. 363 */ 364 for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) { 365 q = irq_ptr->input_qs[i]; 366 if (q) { 367 free_page((unsigned long) q->slib); 368 kmem_cache_free(qdio_q_cache, q); 369 } 370 } 371 for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) { 372 q = irq_ptr->output_qs[i]; 373 if (q) { 374 if (q->u.out.use_cq) { 375 int n; 376 377 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) { 378 struct qaob *aob = q->u.out.aobs[n]; 379 if (aob) { 380 qdio_release_aob(aob); 381 q->u.out.aobs[n] = NULL; 382 } 383 } 384 385 qdio_disable_async_operation(&q->u.out); 386 } 387 free_page((unsigned long) q->slib); 388 kmem_cache_free(qdio_q_cache, q); 389 } 390 } 391 free_page((unsigned long) irq_ptr->qdr); 392 free_page(irq_ptr->chsc_page); 393 free_page((unsigned long) irq_ptr); 394 } 395 396 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr, 397 struct qdio_q **irq_ptr_qs, 398 int i, int nr) 399 { 400 irq_ptr->qdr->qdf0[i + nr].sliba = 401 (unsigned long)irq_ptr_qs[i]->slib; 402 403 irq_ptr->qdr->qdf0[i + nr].sla = 404 (unsigned long)irq_ptr_qs[i]->sl; 405 406 irq_ptr->qdr->qdf0[i + nr].slsba = 407 (unsigned long)&irq_ptr_qs[i]->slsb.val[0]; 408 409 irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4; 410 irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4; 411 irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4; 412 irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4; 413 } 414 415 static void setup_qdr(struct qdio_irq *irq_ptr, 416 struct qdio_initialize *qdio_init) 417 { 418 int i; 419 420 irq_ptr->qdr->qfmt = qdio_init->q_format; 421 irq_ptr->qdr->ac = qdio_init->qdr_ac; 422 irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs; 423 irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs; 424 irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */ 425 irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4; 426 irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib; 427 irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4; 428 429 for (i = 0; i < qdio_init->no_input_qs; i++) 430 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0); 431 432 for (i = 0; i < qdio_init->no_output_qs; i++) 433 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i, 434 qdio_init->no_input_qs); 435 } 436 437 static void setup_qib(struct qdio_irq *irq_ptr, 438 struct qdio_initialize *init_data) 439 { 440 if (qebsm_possible()) 441 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM; 442 443 irq_ptr->qib.rflags |= init_data->qib_rflags; 444 445 irq_ptr->qib.qfmt = init_data->q_format; 446 if (init_data->no_input_qs) 447 irq_ptr->qib.isliba = 448 (unsigned long)(irq_ptr->input_qs[0]->slib); 449 if (init_data->no_output_qs) 450 irq_ptr->qib.osliba = 451 (unsigned long)(irq_ptr->output_qs[0]->slib); 452 memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8); 453 } 454 455 int qdio_setup_irq(struct qdio_initialize *init_data) 456 { 457 struct ciw *ciw; 458 struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data; 459 460 memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib)); 461 memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag)); 462 memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw)); 463 memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc)); 464 memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat)); 465 466 irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL; 467 irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0; 468 469 /* wipes qib.ac, required by ar7063 */ 470 memset(irq_ptr->qdr, 0, sizeof(struct qdr)); 471 472 irq_ptr->int_parm = init_data->int_parm; 473 irq_ptr->nr_input_qs = init_data->no_input_qs; 474 irq_ptr->nr_output_qs = init_data->no_output_qs; 475 irq_ptr->cdev = init_data->cdev; 476 irq_ptr->scan_threshold = init_data->scan_threshold; 477 ccw_device_get_schid(irq_ptr->cdev, &irq_ptr->schid); 478 setup_queues(irq_ptr, init_data); 479 480 setup_qib(irq_ptr, init_data); 481 qdio_setup_thinint(irq_ptr); 482 set_impl_params(irq_ptr, init_data->qib_param_field_format, 483 init_data->qib_param_field, 484 init_data->input_slib_elements, 485 init_data->output_slib_elements); 486 487 /* fill input and output descriptors */ 488 setup_qdr(irq_ptr, init_data); 489 490 /* qdr, qib, sls, slsbs, slibs, sbales are filled now */ 491 492 /* get qdio commands */ 493 ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE); 494 if (!ciw) { 495 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no); 496 return -EINVAL; 497 } 498 irq_ptr->equeue = *ciw; 499 500 ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE); 501 if (!ciw) { 502 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no); 503 return -EINVAL; 504 } 505 irq_ptr->aqueue = *ciw; 506 507 /* set new interrupt handler */ 508 spin_lock_irq(get_ccwdev_lock(irq_ptr->cdev)); 509 irq_ptr->orig_handler = init_data->cdev->handler; 510 init_data->cdev->handler = qdio_int_handler; 511 spin_unlock_irq(get_ccwdev_lock(irq_ptr->cdev)); 512 return 0; 513 } 514 515 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr, 516 struct ccw_device *cdev) 517 { 518 char s[80]; 519 520 snprintf(s, 80, "qdio: %s %s on SC %x using " 521 "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n", 522 dev_name(&cdev->dev), 523 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" : 524 ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"), 525 irq_ptr->schid.sch_no, 526 is_thinint_irq(irq_ptr), 527 (irq_ptr->sch_token) ? 1 : 0, 528 pci_out_supported(irq_ptr) ? 1 : 0, 529 css_general_characteristics.aif_tdd, 530 (irq_ptr->siga_flag.input) ? "R" : " ", 531 (irq_ptr->siga_flag.output) ? "W" : " ", 532 (irq_ptr->siga_flag.sync) ? "S" : " ", 533 (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ", 534 (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " "); 535 printk(KERN_INFO "%s", s); 536 } 537 538 int qdio_enable_async_operation(struct qdio_output_q *outq) 539 { 540 outq->aobs = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *), 541 GFP_ATOMIC); 542 if (!outq->aobs) { 543 outq->use_cq = 0; 544 return -ENOMEM; 545 } 546 outq->use_cq = 1; 547 return 0; 548 } 549 550 void qdio_disable_async_operation(struct qdio_output_q *q) 551 { 552 kfree(q->aobs); 553 q->aobs = NULL; 554 q->use_cq = 0; 555 } 556 557 int __init qdio_setup_init(void) 558 { 559 int rc; 560 561 qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q), 562 256, 0, NULL); 563 if (!qdio_q_cache) 564 return -ENOMEM; 565 566 qdio_aob_cache = kmem_cache_create("qdio_aob", 567 sizeof(struct qaob), 568 sizeof(struct qaob), 569 0, 570 NULL); 571 if (!qdio_aob_cache) { 572 rc = -ENOMEM; 573 goto free_qdio_q_cache; 574 } 575 576 /* Check for OSA/FCP thin interrupts (bit 67). */ 577 DBF_EVENT("thinint:%1d", 578 (css_general_characteristics.aif_osa) ? 1 : 0); 579 580 /* Check for QEBSM support in general (bit 58). */ 581 DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0); 582 rc = 0; 583 out: 584 return rc; 585 free_qdio_q_cache: 586 kmem_cache_destroy(qdio_q_cache); 587 goto out; 588 } 589 590 void qdio_setup_exit(void) 591 { 592 kmem_cache_destroy(qdio_aob_cache); 593 kmem_cache_destroy(qdio_q_cache); 594 } 595