1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * S/390 common I/O routines -- channel subsystem call 4 * 5 * Copyright IBM Corp. 1999,2012 6 * Author(s): Ingo Adlung (adlung@de.ibm.com) 7 * Cornelia Huck (cornelia.huck@de.ibm.com) 8 * Arnd Bergmann (arndb@de.ibm.com) 9 */ 10 11 #define KMSG_COMPONENT "cio" 12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 13 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/init.h> 17 #include <linux/device.h> 18 #include <linux/mutex.h> 19 #include <linux/pci.h> 20 21 #include <asm/cio.h> 22 #include <asm/chpid.h> 23 #include <asm/chsc.h> 24 #include <asm/crw.h> 25 #include <asm/isc.h> 26 #include <asm/ebcdic.h> 27 28 #include "css.h" 29 #include "cio.h" 30 #include "cio_debug.h" 31 #include "ioasm.h" 32 #include "chp.h" 33 #include "chsc.h" 34 35 static void *sei_page; 36 static void *chsc_page; 37 static DEFINE_SPINLOCK(chsc_page_lock); 38 39 /** 40 * chsc_error_from_response() - convert a chsc response to an error 41 * @response: chsc response code 42 * 43 * Returns an appropriate Linux error code for @response. 44 */ 45 int chsc_error_from_response(int response) 46 { 47 switch (response) { 48 case 0x0001: 49 return 0; 50 case 0x0002: 51 case 0x0003: 52 case 0x0006: 53 case 0x0007: 54 case 0x0008: 55 case 0x000a: 56 case 0x0104: 57 return -EINVAL; 58 case 0x0004: 59 return -EOPNOTSUPP; 60 case 0x000b: 61 case 0x0107: /* "Channel busy" for the op 0x003d */ 62 return -EBUSY; 63 case 0x0100: 64 case 0x0102: 65 return -ENOMEM; 66 default: 67 return -EIO; 68 } 69 } 70 EXPORT_SYMBOL_GPL(chsc_error_from_response); 71 72 struct chsc_ssd_area { 73 struct chsc_header request; 74 u16 :10; 75 u16 ssid:2; 76 u16 :4; 77 u16 f_sch; /* first subchannel */ 78 u16 :16; 79 u16 l_sch; /* last subchannel */ 80 u32 :32; 81 struct chsc_header response; 82 u32 :32; 83 u8 sch_valid : 1; 84 u8 dev_valid : 1; 85 u8 st : 3; /* subchannel type */ 86 u8 zeroes : 3; 87 u8 unit_addr; /* unit address */ 88 u16 devno; /* device number */ 89 u8 path_mask; 90 u8 fla_valid_mask; 91 u16 sch; /* subchannel */ 92 u8 chpid[8]; /* chpids 0-7 */ 93 u16 fla[8]; /* full link addresses 0-7 */ 94 } __attribute__ ((packed)); 95 96 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd) 97 { 98 struct chsc_ssd_area *ssd_area; 99 unsigned long flags; 100 int ccode; 101 int ret; 102 int i; 103 int mask; 104 105 spin_lock_irqsave(&chsc_page_lock, flags); 106 memset(chsc_page, 0, PAGE_SIZE); 107 ssd_area = chsc_page; 108 ssd_area->request.length = 0x0010; 109 ssd_area->request.code = 0x0004; 110 ssd_area->ssid = schid.ssid; 111 ssd_area->f_sch = schid.sch_no; 112 ssd_area->l_sch = schid.sch_no; 113 114 ccode = chsc(ssd_area); 115 /* Check response. */ 116 if (ccode > 0) { 117 ret = (ccode == 3) ? -ENODEV : -EBUSY; 118 goto out; 119 } 120 ret = chsc_error_from_response(ssd_area->response.code); 121 if (ret != 0) { 122 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n", 123 schid.ssid, schid.sch_no, 124 ssd_area->response.code); 125 goto out; 126 } 127 if (!ssd_area->sch_valid) { 128 ret = -ENODEV; 129 goto out; 130 } 131 /* Copy data */ 132 ret = 0; 133 memset(ssd, 0, sizeof(struct chsc_ssd_info)); 134 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) && 135 (ssd_area->st != SUBCHANNEL_TYPE_MSG)) 136 goto out; 137 ssd->path_mask = ssd_area->path_mask; 138 ssd->fla_valid_mask = ssd_area->fla_valid_mask; 139 for (i = 0; i < 8; i++) { 140 mask = 0x80 >> i; 141 if (ssd_area->path_mask & mask) { 142 chp_id_init(&ssd->chpid[i]); 143 ssd->chpid[i].id = ssd_area->chpid[i]; 144 } 145 if (ssd_area->fla_valid_mask & mask) 146 ssd->fla[i] = ssd_area->fla[i]; 147 } 148 out: 149 spin_unlock_irqrestore(&chsc_page_lock, flags); 150 return ret; 151 } 152 153 /** 154 * chsc_ssqd() - store subchannel QDIO data (SSQD) 155 * @schid: id of the subchannel on which SSQD is performed 156 * @ssqd: request and response block for SSQD 157 * 158 * Returns 0 on success. 159 */ 160 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd) 161 { 162 memset(ssqd, 0, sizeof(*ssqd)); 163 ssqd->request.length = 0x0010; 164 ssqd->request.code = 0x0024; 165 ssqd->first_sch = schid.sch_no; 166 ssqd->last_sch = schid.sch_no; 167 ssqd->ssid = schid.ssid; 168 169 if (chsc(ssqd)) 170 return -EIO; 171 172 return chsc_error_from_response(ssqd->response.code); 173 } 174 EXPORT_SYMBOL_GPL(chsc_ssqd); 175 176 /** 177 * chsc_sadc() - set adapter device controls (SADC) 178 * @schid: id of the subchannel on which SADC is performed 179 * @scssc: request and response block for SADC 180 * @summary_indicator_addr: summary indicator address 181 * @subchannel_indicator_addr: subchannel indicator address 182 * 183 * Returns 0 on success. 184 */ 185 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc, 186 u64 summary_indicator_addr, u64 subchannel_indicator_addr) 187 { 188 memset(scssc, 0, sizeof(*scssc)); 189 scssc->request.length = 0x0fe0; 190 scssc->request.code = 0x0021; 191 scssc->operation_code = 0; 192 193 scssc->summary_indicator_addr = summary_indicator_addr; 194 scssc->subchannel_indicator_addr = subchannel_indicator_addr; 195 196 scssc->ks = PAGE_DEFAULT_KEY >> 4; 197 scssc->kc = PAGE_DEFAULT_KEY >> 4; 198 scssc->isc = QDIO_AIRQ_ISC; 199 scssc->schid = schid; 200 201 /* enable the time delay disablement facility */ 202 if (css_general_characteristics.aif_tdd) 203 scssc->word_with_d_bit = 0x10000000; 204 205 if (chsc(scssc)) 206 return -EIO; 207 208 return chsc_error_from_response(scssc->response.code); 209 } 210 EXPORT_SYMBOL_GPL(chsc_sadc); 211 212 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data) 213 { 214 spin_lock_irq(sch->lock); 215 if (sch->driver && sch->driver->chp_event) 216 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0) 217 goto out_unreg; 218 spin_unlock_irq(sch->lock); 219 return 0; 220 221 out_unreg: 222 sch->lpm = 0; 223 spin_unlock_irq(sch->lock); 224 css_schedule_eval(sch->schid); 225 return 0; 226 } 227 228 void chsc_chp_offline(struct chp_id chpid) 229 { 230 struct channel_path *chp = chpid_to_chp(chpid); 231 struct chp_link link; 232 char dbf_txt[15]; 233 234 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id); 235 CIO_TRACE_EVENT(2, dbf_txt); 236 237 if (chp_get_status(chpid) <= 0) 238 return; 239 memset(&link, 0, sizeof(struct chp_link)); 240 link.chpid = chpid; 241 /* Wait until previous actions have settled. */ 242 css_wait_for_slow_path(); 243 244 mutex_lock(&chp->lock); 245 chp_update_desc(chp); 246 mutex_unlock(&chp->lock); 247 248 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link); 249 } 250 251 static int __s390_process_res_acc(struct subchannel *sch, void *data) 252 { 253 spin_lock_irq(sch->lock); 254 if (sch->driver && sch->driver->chp_event) 255 sch->driver->chp_event(sch, data, CHP_ONLINE); 256 spin_unlock_irq(sch->lock); 257 258 return 0; 259 } 260 261 static void s390_process_res_acc(struct chp_link *link) 262 { 263 char dbf_txt[15]; 264 265 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid, 266 link->chpid.id); 267 CIO_TRACE_EVENT( 2, dbf_txt); 268 if (link->fla != 0) { 269 sprintf(dbf_txt, "fla%x", link->fla); 270 CIO_TRACE_EVENT( 2, dbf_txt); 271 } 272 /* Wait until previous actions have settled. */ 273 css_wait_for_slow_path(); 274 /* 275 * I/O resources may have become accessible. 276 * Scan through all subchannels that may be concerned and 277 * do a validation on those. 278 * The more information we have (info), the less scanning 279 * will we have to do. 280 */ 281 for_each_subchannel_staged(__s390_process_res_acc, NULL, link); 282 css_schedule_reprobe(); 283 } 284 285 struct chsc_sei_nt0_area { 286 u8 flags; 287 u8 vf; /* validity flags */ 288 u8 rs; /* reporting source */ 289 u8 cc; /* content code */ 290 u16 fla; /* full link address */ 291 u16 rsid; /* reporting source id */ 292 u32 reserved1; 293 u32 reserved2; 294 /* ccdf has to be big enough for a link-incident record */ 295 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */ 296 } __packed; 297 298 struct chsc_sei_nt2_area { 299 u8 flags; /* p and v bit */ 300 u8 reserved1; 301 u8 reserved2; 302 u8 cc; /* content code */ 303 u32 reserved3[13]; 304 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */ 305 } __packed; 306 307 #define CHSC_SEI_NT0 (1ULL << 63) 308 #define CHSC_SEI_NT2 (1ULL << 61) 309 310 struct chsc_sei { 311 struct chsc_header request; 312 u32 reserved1; 313 u64 ntsm; /* notification type mask */ 314 struct chsc_header response; 315 u32 :24; 316 u8 nt; 317 union { 318 struct chsc_sei_nt0_area nt0_area; 319 struct chsc_sei_nt2_area nt2_area; 320 u8 nt_area[PAGE_SIZE - 24]; 321 } u; 322 } __packed; 323 324 /* 325 * Node Descriptor as defined in SA22-7204, "Common I/O-Device Commands" 326 */ 327 328 #define ND_VALIDITY_VALID 0 329 #define ND_VALIDITY_OUTDATED 1 330 #define ND_VALIDITY_INVALID 2 331 332 struct node_descriptor { 333 /* Flags. */ 334 union { 335 struct { 336 u32 validity:3; 337 u32 reserved:5; 338 } __packed; 339 u8 byte0; 340 } __packed; 341 342 /* Node parameters. */ 343 u32 params:24; 344 345 /* Node ID. */ 346 char type[6]; 347 char model[3]; 348 char manufacturer[3]; 349 char plant[2]; 350 char seq[12]; 351 u16 tag; 352 } __packed; 353 354 /* 355 * Link Incident Record as defined in SA22-7202, "ESCON I/O Interface" 356 */ 357 358 #define LIR_IQ_CLASS_INFO 0 359 #define LIR_IQ_CLASS_DEGRADED 1 360 #define LIR_IQ_CLASS_NOT_OPERATIONAL 2 361 362 struct lir { 363 struct { 364 u32 null:1; 365 u32 reserved:3; 366 u32 class:2; 367 u32 reserved2:2; 368 } __packed iq; 369 u32 ic:8; 370 u32 reserved:16; 371 struct node_descriptor incident_node; 372 struct node_descriptor attached_node; 373 u8 reserved2[32]; 374 } __packed; 375 376 #define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */ 377 #define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ 378 379 /* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */ 380 static char *store_ebcdic(char *dest, const char *src, unsigned long len, 381 char delim) 382 { 383 memcpy(dest, src, len); 384 EBCASC(dest, len); 385 386 if (delim) 387 dest[len++] = delim; 388 389 return dest + len; 390 } 391 392 /* Format node ID and parameters for output in LIR log message. */ 393 static void format_node_data(char *params, char *id, struct node_descriptor *nd) 394 { 395 memset(params, 0, PARAMS_LEN); 396 memset(id, 0, NODEID_LEN); 397 398 if (nd->validity != ND_VALIDITY_VALID) { 399 strncpy(params, "n/a", PARAMS_LEN - 1); 400 strncpy(id, "n/a", NODEID_LEN - 1); 401 return; 402 } 403 404 /* PARAMS=xx,xxxxxx */ 405 snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params); 406 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ 407 id = store_ebcdic(id, nd->type, sizeof(nd->type), '/'); 408 id = store_ebcdic(id, nd->model, sizeof(nd->model), ','); 409 id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.'); 410 id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0); 411 id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ','); 412 sprintf(id, "%04X", nd->tag); 413 } 414 415 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area) 416 { 417 struct lir *lir = (struct lir *) &sei_area->ccdf; 418 char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN], 419 aunodeid[NODEID_LEN]; 420 421 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n", 422 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]); 423 424 /* Ignore NULL Link Incident Records. */ 425 if (lir->iq.null) 426 return; 427 428 /* Inform user that a link requires maintenance actions because it has 429 * become degraded or not operational. Note that this log message is 430 * the primary intention behind a Link Incident Record. */ 431 432 format_node_data(iuparams, iunodeid, &lir->incident_node); 433 format_node_data(auparams, aunodeid, &lir->attached_node); 434 435 switch (lir->iq.class) { 436 case LIR_IQ_CLASS_DEGRADED: 437 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x " 438 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", 439 sei_area->rs, sei_area->rsid, lir->ic, iuparams, 440 iunodeid, auparams, aunodeid); 441 break; 442 case LIR_IQ_CLASS_NOT_OPERATIONAL: 443 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x " 444 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", 445 sei_area->rs, sei_area->rsid, lir->ic, iuparams, 446 iunodeid, auparams, aunodeid); 447 break; 448 default: 449 break; 450 } 451 } 452 453 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) 454 { 455 struct channel_path *chp; 456 struct chp_link link; 457 struct chp_id chpid; 458 int status; 459 460 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, " 461 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid); 462 if (sei_area->rs != 4) 463 return; 464 chp_id_init(&chpid); 465 chpid.id = sei_area->rsid; 466 /* allocate a new channel path structure, if needed */ 467 status = chp_get_status(chpid); 468 if (!status) 469 return; 470 471 if (status < 0) { 472 chp_new(chpid); 473 } else { 474 chp = chpid_to_chp(chpid); 475 mutex_lock(&chp->lock); 476 chp_update_desc(chp); 477 mutex_unlock(&chp->lock); 478 } 479 memset(&link, 0, sizeof(struct chp_link)); 480 link.chpid = chpid; 481 if ((sei_area->vf & 0xc0) != 0) { 482 link.fla = sei_area->fla; 483 if ((sei_area->vf & 0xc0) == 0xc0) 484 /* full link address */ 485 link.fla_mask = 0xffff; 486 else 487 /* link address */ 488 link.fla_mask = 0xff00; 489 } 490 s390_process_res_acc(&link); 491 } 492 493 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area) 494 { 495 struct channel_path *chp; 496 struct chp_id chpid; 497 u8 *data; 498 int num; 499 500 CIO_CRW_EVENT(4, "chsc: channel path availability information\n"); 501 if (sei_area->rs != 0) 502 return; 503 data = sei_area->ccdf; 504 chp_id_init(&chpid); 505 for (num = 0; num <= __MAX_CHPID; num++) { 506 if (!chp_test_bit(data, num)) 507 continue; 508 chpid.id = num; 509 510 CIO_CRW_EVENT(4, "Update information for channel path " 511 "%x.%02x\n", chpid.cssid, chpid.id); 512 chp = chpid_to_chp(chpid); 513 if (!chp) { 514 chp_new(chpid); 515 continue; 516 } 517 mutex_lock(&chp->lock); 518 chp_update_desc(chp); 519 mutex_unlock(&chp->lock); 520 } 521 } 522 523 struct chp_config_data { 524 u8 map[32]; 525 u8 op; 526 u8 pc; 527 }; 528 529 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area) 530 { 531 struct chp_config_data *data; 532 struct chp_id chpid; 533 int num; 534 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"}; 535 536 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n"); 537 if (sei_area->rs != 0) 538 return; 539 data = (struct chp_config_data *) &(sei_area->ccdf); 540 chp_id_init(&chpid); 541 for (num = 0; num <= __MAX_CHPID; num++) { 542 if (!chp_test_bit(data->map, num)) 543 continue; 544 chpid.id = num; 545 pr_notice("Processing %s for channel path %x.%02x\n", 546 events[data->op], chpid.cssid, chpid.id); 547 switch (data->op) { 548 case 0: 549 chp_cfg_schedule(chpid, 1); 550 break; 551 case 1: 552 chp_cfg_schedule(chpid, 0); 553 break; 554 case 2: 555 chp_cfg_cancel_deconfigure(chpid); 556 break; 557 } 558 } 559 } 560 561 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area) 562 { 563 int ret; 564 565 CIO_CRW_EVENT(4, "chsc: scm change notification\n"); 566 if (sei_area->rs != 7) 567 return; 568 569 ret = scm_update_information(); 570 if (ret) 571 CIO_CRW_EVENT(0, "chsc: updating change notification" 572 " failed (rc=%d).\n", ret); 573 } 574 575 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area) 576 { 577 int ret; 578 579 CIO_CRW_EVENT(4, "chsc: scm available information\n"); 580 if (sei_area->rs != 7) 581 return; 582 583 ret = scm_process_availability_information(); 584 if (ret) 585 CIO_CRW_EVENT(0, "chsc: process availability information" 586 " failed (rc=%d).\n", ret); 587 } 588 589 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area) 590 { 591 switch (sei_area->cc) { 592 case 1: 593 zpci_event_error(sei_area->ccdf); 594 break; 595 case 2: 596 zpci_event_availability(sei_area->ccdf); 597 break; 598 default: 599 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n", 600 sei_area->cc); 601 break; 602 } 603 } 604 605 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) 606 { 607 /* which kind of information was stored? */ 608 switch (sei_area->cc) { 609 case 1: /* link incident*/ 610 chsc_process_sei_link_incident(sei_area); 611 break; 612 case 2: /* i/o resource accessibility */ 613 chsc_process_sei_res_acc(sei_area); 614 break; 615 case 7: /* channel-path-availability information */ 616 chsc_process_sei_chp_avail(sei_area); 617 break; 618 case 8: /* channel-path-configuration notification */ 619 chsc_process_sei_chp_config(sei_area); 620 break; 621 case 12: /* scm change notification */ 622 chsc_process_sei_scm_change(sei_area); 623 break; 624 case 14: /* scm available notification */ 625 chsc_process_sei_scm_avail(sei_area); 626 break; 627 default: /* other stuff */ 628 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n", 629 sei_area->cc); 630 break; 631 } 632 633 /* Check if we might have lost some information. */ 634 if (sei_area->flags & 0x40) { 635 CIO_CRW_EVENT(2, "chsc: event overflow\n"); 636 css_schedule_eval_all(); 637 } 638 } 639 640 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm) 641 { 642 static int ntsm_unsupported; 643 644 while (true) { 645 memset(sei, 0, sizeof(*sei)); 646 sei->request.length = 0x0010; 647 sei->request.code = 0x000e; 648 if (!ntsm_unsupported) 649 sei->ntsm = ntsm; 650 651 if (chsc(sei)) 652 break; 653 654 if (sei->response.code != 0x0001) { 655 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n", 656 sei->response.code, sei->ntsm); 657 658 if (sei->response.code == 3 && sei->ntsm) { 659 /* Fallback for old firmware. */ 660 ntsm_unsupported = 1; 661 continue; 662 } 663 break; 664 } 665 666 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt); 667 switch (sei->nt) { 668 case 0: 669 chsc_process_sei_nt0(&sei->u.nt0_area); 670 break; 671 case 2: 672 chsc_process_sei_nt2(&sei->u.nt2_area); 673 break; 674 default: 675 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt); 676 break; 677 } 678 679 if (!(sei->u.nt0_area.flags & 0x80)) 680 break; 681 } 682 } 683 684 /* 685 * Handle channel subsystem related CRWs. 686 * Use store event information to find out what's going on. 687 * 688 * Note: Access to sei_page is serialized through machine check handler 689 * thread, so no need for locking. 690 */ 691 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) 692 { 693 struct chsc_sei *sei = sei_page; 694 695 if (overflow) { 696 css_schedule_eval_all(); 697 return; 698 } 699 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " 700 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", 701 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, 702 crw0->erc, crw0->rsid); 703 704 CIO_TRACE_EVENT(2, "prcss"); 705 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2); 706 } 707 708 void chsc_chp_online(struct chp_id chpid) 709 { 710 struct channel_path *chp = chpid_to_chp(chpid); 711 struct chp_link link; 712 char dbf_txt[15]; 713 714 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); 715 CIO_TRACE_EVENT(2, dbf_txt); 716 717 if (chp_get_status(chpid) != 0) { 718 memset(&link, 0, sizeof(struct chp_link)); 719 link.chpid = chpid; 720 /* Wait until previous actions have settled. */ 721 css_wait_for_slow_path(); 722 723 mutex_lock(&chp->lock); 724 chp_update_desc(chp); 725 mutex_unlock(&chp->lock); 726 727 for_each_subchannel_staged(__s390_process_res_acc, NULL, 728 &link); 729 css_schedule_reprobe(); 730 } 731 } 732 733 static void __s390_subchannel_vary_chpid(struct subchannel *sch, 734 struct chp_id chpid, int on) 735 { 736 unsigned long flags; 737 struct chp_link link; 738 739 memset(&link, 0, sizeof(struct chp_link)); 740 link.chpid = chpid; 741 spin_lock_irqsave(sch->lock, flags); 742 if (sch->driver && sch->driver->chp_event) 743 sch->driver->chp_event(sch, &link, 744 on ? CHP_VARY_ON : CHP_VARY_OFF); 745 spin_unlock_irqrestore(sch->lock, flags); 746 } 747 748 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data) 749 { 750 struct chp_id *chpid = data; 751 752 __s390_subchannel_vary_chpid(sch, *chpid, 0); 753 return 0; 754 } 755 756 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data) 757 { 758 struct chp_id *chpid = data; 759 760 __s390_subchannel_vary_chpid(sch, *chpid, 1); 761 return 0; 762 } 763 764 /** 765 * chsc_chp_vary - propagate channel-path vary operation to subchannels 766 * @chpid: channl-path ID 767 * @on: non-zero for vary online, zero for vary offline 768 */ 769 int chsc_chp_vary(struct chp_id chpid, int on) 770 { 771 struct channel_path *chp = chpid_to_chp(chpid); 772 773 /* Wait until previous actions have settled. */ 774 css_wait_for_slow_path(); 775 /* 776 * Redo PathVerification on the devices the chpid connects to 777 */ 778 if (on) { 779 /* Try to update the channel path description. */ 780 chp_update_desc(chp); 781 for_each_subchannel_staged(s390_subchannel_vary_chpid_on, 782 NULL, &chpid); 783 css_schedule_reprobe(); 784 } else 785 for_each_subchannel_staged(s390_subchannel_vary_chpid_off, 786 NULL, &chpid); 787 788 return 0; 789 } 790 791 static void 792 chsc_remove_cmg_attr(struct channel_subsystem *css) 793 { 794 int i; 795 796 for (i = 0; i <= __MAX_CHPID; i++) { 797 if (!css->chps[i]) 798 continue; 799 chp_remove_cmg_attr(css->chps[i]); 800 } 801 } 802 803 static int 804 chsc_add_cmg_attr(struct channel_subsystem *css) 805 { 806 int i, ret; 807 808 ret = 0; 809 for (i = 0; i <= __MAX_CHPID; i++) { 810 if (!css->chps[i]) 811 continue; 812 ret = chp_add_cmg_attr(css->chps[i]); 813 if (ret) 814 goto cleanup; 815 } 816 return ret; 817 cleanup: 818 for (--i; i >= 0; i--) { 819 if (!css->chps[i]) 820 continue; 821 chp_remove_cmg_attr(css->chps[i]); 822 } 823 return ret; 824 } 825 826 int __chsc_do_secm(struct channel_subsystem *css, int enable) 827 { 828 struct { 829 struct chsc_header request; 830 u32 operation_code : 2; 831 u32 : 30; 832 u32 key : 4; 833 u32 : 28; 834 u32 zeroes1; 835 u32 cub_addr1; 836 u32 zeroes2; 837 u32 cub_addr2; 838 u32 reserved[13]; 839 struct chsc_header response; 840 u32 status : 8; 841 u32 : 4; 842 u32 fmt : 4; 843 u32 : 16; 844 } __attribute__ ((packed)) *secm_area; 845 unsigned long flags; 846 int ret, ccode; 847 848 spin_lock_irqsave(&chsc_page_lock, flags); 849 memset(chsc_page, 0, PAGE_SIZE); 850 secm_area = chsc_page; 851 secm_area->request.length = 0x0050; 852 secm_area->request.code = 0x0016; 853 854 secm_area->key = PAGE_DEFAULT_KEY >> 4; 855 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1; 856 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2; 857 858 secm_area->operation_code = enable ? 0 : 1; 859 860 ccode = chsc(secm_area); 861 if (ccode > 0) { 862 ret = (ccode == 3) ? -ENODEV : -EBUSY; 863 goto out; 864 } 865 866 switch (secm_area->response.code) { 867 case 0x0102: 868 case 0x0103: 869 ret = -EINVAL; 870 break; 871 default: 872 ret = chsc_error_from_response(secm_area->response.code); 873 } 874 if (ret != 0) 875 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n", 876 secm_area->response.code); 877 out: 878 spin_unlock_irqrestore(&chsc_page_lock, flags); 879 return ret; 880 } 881 882 int 883 chsc_secm(struct channel_subsystem *css, int enable) 884 { 885 int ret; 886 887 if (enable && !css->cm_enabled) { 888 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 889 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 890 if (!css->cub_addr1 || !css->cub_addr2) { 891 free_page((unsigned long)css->cub_addr1); 892 free_page((unsigned long)css->cub_addr2); 893 return -ENOMEM; 894 } 895 } 896 ret = __chsc_do_secm(css, enable); 897 if (!ret) { 898 css->cm_enabled = enable; 899 if (css->cm_enabled) { 900 ret = chsc_add_cmg_attr(css); 901 if (ret) { 902 __chsc_do_secm(css, 0); 903 css->cm_enabled = 0; 904 } 905 } else 906 chsc_remove_cmg_attr(css); 907 } 908 if (!css->cm_enabled) { 909 free_page((unsigned long)css->cub_addr1); 910 free_page((unsigned long)css->cub_addr2); 911 } 912 return ret; 913 } 914 915 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, 916 int c, int m, void *page) 917 { 918 struct chsc_scpd *scpd_area; 919 int ccode, ret; 920 921 if ((rfmt == 1 || rfmt == 0) && c == 1 && 922 !css_general_characteristics.fcs) 923 return -EINVAL; 924 if ((rfmt == 2) && !css_general_characteristics.cib) 925 return -EINVAL; 926 if ((rfmt == 3) && !css_general_characteristics.util_str) 927 return -EINVAL; 928 929 memset(page, 0, PAGE_SIZE); 930 scpd_area = page; 931 scpd_area->request.length = 0x0010; 932 scpd_area->request.code = 0x0002; 933 scpd_area->cssid = chpid.cssid; 934 scpd_area->first_chpid = chpid.id; 935 scpd_area->last_chpid = chpid.id; 936 scpd_area->m = m; 937 scpd_area->c = c; 938 scpd_area->fmt = fmt; 939 scpd_area->rfmt = rfmt; 940 941 ccode = chsc(scpd_area); 942 if (ccode > 0) 943 return (ccode == 3) ? -ENODEV : -EBUSY; 944 945 ret = chsc_error_from_response(scpd_area->response.code); 946 if (ret) 947 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n", 948 scpd_area->response.code); 949 return ret; 950 } 951 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); 952 953 #define chsc_det_chp_desc(FMT, c) \ 954 int chsc_determine_fmt##FMT##_channel_path_desc( \ 955 struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \ 956 { \ 957 struct chsc_scpd *scpd_area; \ 958 unsigned long flags; \ 959 int ret; \ 960 \ 961 spin_lock_irqsave(&chsc_page_lock, flags); \ 962 scpd_area = chsc_page; \ 963 ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \ 964 scpd_area); \ 965 if (ret) \ 966 goto out; \ 967 \ 968 memcpy(desc, scpd_area->data, sizeof(*desc)); \ 969 out: \ 970 spin_unlock_irqrestore(&chsc_page_lock, flags); \ 971 return ret; \ 972 } 973 974 chsc_det_chp_desc(0, 0) 975 chsc_det_chp_desc(1, 1) 976 chsc_det_chp_desc(3, 0) 977 978 static void 979 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, 980 struct cmg_chars *chars) 981 { 982 int i, mask; 983 984 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { 985 mask = 0x80 >> (i + 3); 986 if (cmcv & mask) 987 chp->cmg_chars.values[i] = chars->values[i]; 988 else 989 chp->cmg_chars.values[i] = 0; 990 } 991 } 992 993 int chsc_get_channel_measurement_chars(struct channel_path *chp) 994 { 995 unsigned long flags; 996 int ccode, ret; 997 998 struct { 999 struct chsc_header request; 1000 u32 : 24; 1001 u32 first_chpid : 8; 1002 u32 : 24; 1003 u32 last_chpid : 8; 1004 u32 zeroes1; 1005 struct chsc_header response; 1006 u32 zeroes2; 1007 u32 not_valid : 1; 1008 u32 shared : 1; 1009 u32 : 22; 1010 u32 chpid : 8; 1011 u32 cmcv : 5; 1012 u32 : 11; 1013 u32 cmgq : 8; 1014 u32 cmg : 8; 1015 u32 zeroes3; 1016 u32 data[NR_MEASUREMENT_CHARS]; 1017 } __attribute__ ((packed)) *scmc_area; 1018 1019 chp->shared = -1; 1020 chp->cmg = -1; 1021 1022 if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm) 1023 return -EINVAL; 1024 1025 spin_lock_irqsave(&chsc_page_lock, flags); 1026 memset(chsc_page, 0, PAGE_SIZE); 1027 scmc_area = chsc_page; 1028 scmc_area->request.length = 0x0010; 1029 scmc_area->request.code = 0x0022; 1030 scmc_area->first_chpid = chp->chpid.id; 1031 scmc_area->last_chpid = chp->chpid.id; 1032 1033 ccode = chsc(scmc_area); 1034 if (ccode > 0) { 1035 ret = (ccode == 3) ? -ENODEV : -EBUSY; 1036 goto out; 1037 } 1038 1039 ret = chsc_error_from_response(scmc_area->response.code); 1040 if (ret) { 1041 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n", 1042 scmc_area->response.code); 1043 goto out; 1044 } 1045 if (scmc_area->not_valid) 1046 goto out; 1047 1048 chp->cmg = scmc_area->cmg; 1049 chp->shared = scmc_area->shared; 1050 if (chp->cmg != 2 && chp->cmg != 3) { 1051 /* No cmg-dependent data. */ 1052 goto out; 1053 } 1054 chsc_initialize_cmg_chars(chp, scmc_area->cmcv, 1055 (struct cmg_chars *) &scmc_area->data); 1056 out: 1057 spin_unlock_irqrestore(&chsc_page_lock, flags); 1058 return ret; 1059 } 1060 1061 int __init chsc_init(void) 1062 { 1063 int ret; 1064 1065 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 1066 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 1067 if (!sei_page || !chsc_page) { 1068 ret = -ENOMEM; 1069 goto out_err; 1070 } 1071 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw); 1072 if (ret) 1073 goto out_err; 1074 return ret; 1075 out_err: 1076 free_page((unsigned long)chsc_page); 1077 free_page((unsigned long)sei_page); 1078 return ret; 1079 } 1080 1081 void __init chsc_init_cleanup(void) 1082 { 1083 crw_unregister_handler(CRW_RSC_CSS); 1084 free_page((unsigned long)chsc_page); 1085 free_page((unsigned long)sei_page); 1086 } 1087 1088 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code) 1089 { 1090 int ret; 1091 1092 sda_area->request.length = 0x0400; 1093 sda_area->request.code = 0x0031; 1094 sda_area->operation_code = operation_code; 1095 1096 ret = chsc(sda_area); 1097 if (ret > 0) { 1098 ret = (ret == 3) ? -ENODEV : -EBUSY; 1099 goto out; 1100 } 1101 1102 switch (sda_area->response.code) { 1103 case 0x0101: 1104 ret = -EOPNOTSUPP; 1105 break; 1106 default: 1107 ret = chsc_error_from_response(sda_area->response.code); 1108 } 1109 out: 1110 return ret; 1111 } 1112 1113 int chsc_enable_facility(int operation_code) 1114 { 1115 struct chsc_sda_area *sda_area; 1116 unsigned long flags; 1117 int ret; 1118 1119 spin_lock_irqsave(&chsc_page_lock, flags); 1120 memset(chsc_page, 0, PAGE_SIZE); 1121 sda_area = chsc_page; 1122 1123 ret = __chsc_enable_facility(sda_area, operation_code); 1124 if (ret != 0) 1125 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n", 1126 operation_code, sda_area->response.code); 1127 1128 spin_unlock_irqrestore(&chsc_page_lock, flags); 1129 return ret; 1130 } 1131 1132 int __init chsc_get_cssid(int idx) 1133 { 1134 struct { 1135 struct chsc_header request; 1136 u8 atype; 1137 u32 : 24; 1138 u32 reserved1[6]; 1139 struct chsc_header response; 1140 u32 reserved2[3]; 1141 struct { 1142 u8 cssid; 1143 u32 : 24; 1144 } list[0]; 1145 } __packed *sdcal_area; 1146 int ret; 1147 1148 spin_lock_irq(&chsc_page_lock); 1149 memset(chsc_page, 0, PAGE_SIZE); 1150 sdcal_area = chsc_page; 1151 sdcal_area->request.length = 0x0020; 1152 sdcal_area->request.code = 0x0034; 1153 sdcal_area->atype = 4; 1154 1155 ret = chsc(sdcal_area); 1156 if (ret) { 1157 ret = (ret == 3) ? -ENODEV : -EBUSY; 1158 goto exit; 1159 } 1160 1161 ret = chsc_error_from_response(sdcal_area->response.code); 1162 if (ret) { 1163 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n", 1164 sdcal_area->response.code); 1165 goto exit; 1166 } 1167 1168 if ((addr_t) &sdcal_area->list[idx] < 1169 (addr_t) &sdcal_area->response + sdcal_area->response.length) 1170 ret = sdcal_area->list[idx].cssid; 1171 else 1172 ret = -ENODEV; 1173 exit: 1174 spin_unlock_irq(&chsc_page_lock); 1175 return ret; 1176 } 1177 1178 struct css_general_char css_general_characteristics; 1179 struct css_chsc_char css_chsc_characteristics; 1180 1181 int __init 1182 chsc_determine_css_characteristics(void) 1183 { 1184 unsigned long flags; 1185 int result; 1186 struct { 1187 struct chsc_header request; 1188 u32 reserved1; 1189 u32 reserved2; 1190 u32 reserved3; 1191 struct chsc_header response; 1192 u32 reserved4; 1193 u32 general_char[510]; 1194 u32 chsc_char[508]; 1195 } __attribute__ ((packed)) *scsc_area; 1196 1197 spin_lock_irqsave(&chsc_page_lock, flags); 1198 memset(chsc_page, 0, PAGE_SIZE); 1199 scsc_area = chsc_page; 1200 scsc_area->request.length = 0x0010; 1201 scsc_area->request.code = 0x0010; 1202 1203 result = chsc(scsc_area); 1204 if (result) { 1205 result = (result == 3) ? -ENODEV : -EBUSY; 1206 goto exit; 1207 } 1208 1209 result = chsc_error_from_response(scsc_area->response.code); 1210 if (result == 0) { 1211 memcpy(&css_general_characteristics, scsc_area->general_char, 1212 sizeof(css_general_characteristics)); 1213 memcpy(&css_chsc_characteristics, scsc_area->chsc_char, 1214 sizeof(css_chsc_characteristics)); 1215 } else 1216 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n", 1217 scsc_area->response.code); 1218 exit: 1219 spin_unlock_irqrestore(&chsc_page_lock, flags); 1220 return result; 1221 } 1222 1223 EXPORT_SYMBOL_GPL(css_general_characteristics); 1224 EXPORT_SYMBOL_GPL(css_chsc_characteristics); 1225 1226 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta) 1227 { 1228 struct { 1229 struct chsc_header request; 1230 unsigned int rsvd0; 1231 unsigned int op : 8; 1232 unsigned int rsvd1 : 8; 1233 unsigned int ctrl : 16; 1234 unsigned int rsvd2[5]; 1235 struct chsc_header response; 1236 unsigned int rsvd3[3]; 1237 u64 clock_delta; 1238 unsigned int rsvd4[2]; 1239 } __attribute__ ((packed)) *rr; 1240 int rc; 1241 1242 memset(page, 0, PAGE_SIZE); 1243 rr = page; 1244 rr->request.length = 0x0020; 1245 rr->request.code = 0x0033; 1246 rr->op = op; 1247 rr->ctrl = ctrl; 1248 rc = chsc(rr); 1249 if (rc) 1250 return -EIO; 1251 rc = (rr->response.code == 0x0001) ? 0 : -EIO; 1252 if (clock_delta) 1253 *clock_delta = rr->clock_delta; 1254 return rc; 1255 } 1256 1257 int chsc_sstpi(void *page, void *result, size_t size) 1258 { 1259 struct { 1260 struct chsc_header request; 1261 unsigned int rsvd0[3]; 1262 struct chsc_header response; 1263 char data[]; 1264 } __attribute__ ((packed)) *rr; 1265 int rc; 1266 1267 memset(page, 0, PAGE_SIZE); 1268 rr = page; 1269 rr->request.length = 0x0010; 1270 rr->request.code = 0x0038; 1271 rc = chsc(rr); 1272 if (rc) 1273 return -EIO; 1274 memcpy(result, &rr->data, size); 1275 return (rr->response.code == 0x0001) ? 0 : -EIO; 1276 } 1277 1278 int chsc_siosl(struct subchannel_id schid) 1279 { 1280 struct { 1281 struct chsc_header request; 1282 u32 word1; 1283 struct subchannel_id sid; 1284 u32 word3; 1285 struct chsc_header response; 1286 u32 word[11]; 1287 } __attribute__ ((packed)) *siosl_area; 1288 unsigned long flags; 1289 int ccode; 1290 int rc; 1291 1292 spin_lock_irqsave(&chsc_page_lock, flags); 1293 memset(chsc_page, 0, PAGE_SIZE); 1294 siosl_area = chsc_page; 1295 siosl_area->request.length = 0x0010; 1296 siosl_area->request.code = 0x0046; 1297 siosl_area->word1 = 0x80000000; 1298 siosl_area->sid = schid; 1299 1300 ccode = chsc(siosl_area); 1301 if (ccode > 0) { 1302 if (ccode == 3) 1303 rc = -ENODEV; 1304 else 1305 rc = -EBUSY; 1306 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n", 1307 schid.ssid, schid.sch_no, ccode); 1308 goto out; 1309 } 1310 rc = chsc_error_from_response(siosl_area->response.code); 1311 if (rc) 1312 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n", 1313 schid.ssid, schid.sch_no, 1314 siosl_area->response.code); 1315 else 1316 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n", 1317 schid.ssid, schid.sch_no); 1318 out: 1319 spin_unlock_irqrestore(&chsc_page_lock, flags); 1320 return rc; 1321 } 1322 EXPORT_SYMBOL_GPL(chsc_siosl); 1323 1324 /** 1325 * chsc_scm_info() - store SCM information (SSI) 1326 * @scm_area: request and response block for SSI 1327 * @token: continuation token 1328 * 1329 * Returns 0 on success. 1330 */ 1331 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token) 1332 { 1333 int ccode, ret; 1334 1335 memset(scm_area, 0, sizeof(*scm_area)); 1336 scm_area->request.length = 0x0020; 1337 scm_area->request.code = 0x004C; 1338 scm_area->reqtok = token; 1339 1340 ccode = chsc(scm_area); 1341 if (ccode > 0) { 1342 ret = (ccode == 3) ? -ENODEV : -EBUSY; 1343 goto out; 1344 } 1345 ret = chsc_error_from_response(scm_area->response.code); 1346 if (ret != 0) 1347 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n", 1348 scm_area->response.code); 1349 out: 1350 return ret; 1351 } 1352 EXPORT_SYMBOL_GPL(chsc_scm_info); 1353 1354 /** 1355 * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info. 1356 * @schid: id of the subchannel on which PNSO is performed 1357 * @brinfo_area: request and response block for the operation 1358 * @resume_token: resume token for multiblock response 1359 * @cnc: Boolean change-notification control 1360 * 1361 * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL) 1362 * 1363 * Returns 0 on success. 1364 */ 1365 int chsc_pnso_brinfo(struct subchannel_id schid, 1366 struct chsc_pnso_area *brinfo_area, 1367 struct chsc_brinfo_resume_token resume_token, 1368 int cnc) 1369 { 1370 memset(brinfo_area, 0, sizeof(*brinfo_area)); 1371 brinfo_area->request.length = 0x0030; 1372 brinfo_area->request.code = 0x003d; /* network-subchannel operation */ 1373 brinfo_area->m = schid.m; 1374 brinfo_area->ssid = schid.ssid; 1375 brinfo_area->sch = schid.sch_no; 1376 brinfo_area->cssid = schid.cssid; 1377 brinfo_area->oc = 0; /* Store-network-bridging-information list */ 1378 brinfo_area->resume_token = resume_token; 1379 brinfo_area->n = (cnc != 0); 1380 if (chsc(brinfo_area)) 1381 return -EIO; 1382 return chsc_error_from_response(brinfo_area->response.code); 1383 } 1384 EXPORT_SYMBOL_GPL(chsc_pnso_brinfo); 1385