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 #define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */ 40 #define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */ 41 42 static BLOCKING_NOTIFIER_HEAD(chsc_notifiers); 43 44 int chsc_notifier_register(struct notifier_block *nb) 45 { 46 return blocking_notifier_chain_register(&chsc_notifiers, nb); 47 } 48 EXPORT_SYMBOL(chsc_notifier_register); 49 50 int chsc_notifier_unregister(struct notifier_block *nb) 51 { 52 return blocking_notifier_chain_unregister(&chsc_notifiers, nb); 53 } 54 EXPORT_SYMBOL(chsc_notifier_unregister); 55 56 /** 57 * chsc_error_from_response() - convert a chsc response to an error 58 * @response: chsc response code 59 * 60 * Returns an appropriate Linux error code for @response. 61 */ 62 int chsc_error_from_response(int response) 63 { 64 switch (response) { 65 case 0x0001: 66 return 0; 67 case 0x0002: 68 case 0x0003: 69 case 0x0006: 70 case 0x0007: 71 case 0x0008: 72 case 0x000a: 73 case 0x0104: 74 return -EINVAL; 75 case 0x0004: 76 case 0x0106: /* "Wrong Channel Parm" for the op 0x003d */ 77 return -EOPNOTSUPP; 78 case 0x000b: 79 case 0x0107: /* "Channel busy" for the op 0x003d */ 80 return -EBUSY; 81 case 0x0100: 82 case 0x0102: 83 return -ENOMEM; 84 case 0x0108: /* "HW limit exceeded" for the op 0x003d */ 85 return -EUSERS; 86 default: 87 return -EIO; 88 } 89 } 90 EXPORT_SYMBOL_GPL(chsc_error_from_response); 91 92 struct chsc_ssd_area { 93 struct chsc_header request; 94 u16 :10; 95 u16 ssid:2; 96 u16 :4; 97 u16 f_sch; /* first subchannel */ 98 u16 :16; 99 u16 l_sch; /* last subchannel */ 100 u32 :32; 101 struct chsc_header response; 102 u32 :32; 103 u8 sch_valid : 1; 104 u8 dev_valid : 1; 105 u8 st : 3; /* subchannel type */ 106 u8 zeroes : 3; 107 u8 unit_addr; /* unit address */ 108 u16 devno; /* device number */ 109 u8 path_mask; 110 u8 fla_valid_mask; 111 u16 sch; /* subchannel */ 112 u8 chpid[8]; /* chpids 0-7 */ 113 u16 fla[8]; /* full link addresses 0-7 */ 114 } __packed __aligned(PAGE_SIZE); 115 116 int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd) 117 { 118 struct chsc_ssd_area *ssd_area; 119 unsigned long flags; 120 int ccode; 121 int ret; 122 int i; 123 int mask; 124 125 spin_lock_irqsave(&chsc_page_lock, flags); 126 memset(chsc_page, 0, PAGE_SIZE); 127 ssd_area = chsc_page; 128 ssd_area->request.length = 0x0010; 129 ssd_area->request.code = 0x0004; 130 ssd_area->ssid = schid.ssid; 131 ssd_area->f_sch = schid.sch_no; 132 ssd_area->l_sch = schid.sch_no; 133 134 ccode = chsc(ssd_area); 135 /* Check response. */ 136 if (ccode > 0) { 137 ret = (ccode == 3) ? -ENODEV : -EBUSY; 138 goto out; 139 } 140 ret = chsc_error_from_response(ssd_area->response.code); 141 if (ret != 0) { 142 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n", 143 schid.ssid, schid.sch_no, 144 ssd_area->response.code); 145 goto out; 146 } 147 if (!ssd_area->sch_valid) { 148 ret = -ENODEV; 149 goto out; 150 } 151 /* Copy data */ 152 ret = 0; 153 memset(ssd, 0, sizeof(struct chsc_ssd_info)); 154 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) && 155 (ssd_area->st != SUBCHANNEL_TYPE_MSG)) 156 goto out; 157 ssd->path_mask = ssd_area->path_mask; 158 ssd->fla_valid_mask = ssd_area->fla_valid_mask; 159 for (i = 0; i < 8; i++) { 160 mask = 0x80 >> i; 161 if (ssd_area->path_mask & mask) { 162 chp_id_init(&ssd->chpid[i]); 163 ssd->chpid[i].id = ssd_area->chpid[i]; 164 } 165 if (ssd_area->fla_valid_mask & mask) 166 ssd->fla[i] = ssd_area->fla[i]; 167 } 168 out: 169 spin_unlock_irqrestore(&chsc_page_lock, flags); 170 return ret; 171 } 172 173 /** 174 * chsc_ssqd() - store subchannel QDIO data (SSQD) 175 * @schid: id of the subchannel on which SSQD is performed 176 * @ssqd: request and response block for SSQD 177 * 178 * Returns 0 on success. 179 */ 180 int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd) 181 { 182 memset(ssqd, 0, sizeof(*ssqd)); 183 ssqd->request.length = 0x0010; 184 ssqd->request.code = 0x0024; 185 ssqd->first_sch = schid.sch_no; 186 ssqd->last_sch = schid.sch_no; 187 ssqd->ssid = schid.ssid; 188 189 if (chsc(ssqd)) 190 return -EIO; 191 192 return chsc_error_from_response(ssqd->response.code); 193 } 194 EXPORT_SYMBOL_GPL(chsc_ssqd); 195 196 /** 197 * chsc_sadc() - set adapter device controls (SADC) 198 * @schid: id of the subchannel on which SADC is performed 199 * @scssc: request and response block for SADC 200 * @summary_indicator_addr: summary indicator address 201 * @subchannel_indicator_addr: subchannel indicator address 202 * @isc: Interruption Subclass for this subchannel 203 * 204 * Returns 0 on success. 205 */ 206 int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc, 207 dma64_t summary_indicator_addr, dma64_t subchannel_indicator_addr, u8 isc) 208 { 209 memset(scssc, 0, sizeof(*scssc)); 210 scssc->request.length = 0x0fe0; 211 scssc->request.code = 0x0021; 212 scssc->operation_code = 0; 213 214 scssc->summary_indicator_addr = summary_indicator_addr; 215 scssc->subchannel_indicator_addr = subchannel_indicator_addr; 216 217 scssc->ks = PAGE_DEFAULT_KEY >> 4; 218 scssc->kc = PAGE_DEFAULT_KEY >> 4; 219 scssc->isc = isc; 220 scssc->schid = schid; 221 222 /* enable the time delay disablement facility */ 223 if (css_general_characteristics.aif_tdd) 224 scssc->word_with_d_bit = 0x10000000; 225 226 if (chsc(scssc)) 227 return -EIO; 228 229 return chsc_error_from_response(scssc->response.code); 230 } 231 EXPORT_SYMBOL_GPL(chsc_sadc); 232 233 static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data) 234 { 235 spin_lock_irq(&sch->lock); 236 if (sch->driver && sch->driver->chp_event) 237 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0) 238 goto out_unreg; 239 spin_unlock_irq(&sch->lock); 240 return 0; 241 242 out_unreg: 243 sch->lpm = 0; 244 spin_unlock_irq(&sch->lock); 245 css_schedule_eval(sch->schid); 246 return 0; 247 } 248 249 void chsc_chp_offline(struct chp_id chpid) 250 { 251 struct channel_path *chp = chpid_to_chp(chpid); 252 struct chp_link link; 253 char dbf_txt[15]; 254 255 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id); 256 CIO_TRACE_EVENT(2, dbf_txt); 257 258 if (chp_get_status(chpid) <= 0) 259 return; 260 memset(&link, 0, sizeof(struct chp_link)); 261 link.chpid = chpid; 262 /* Wait until previous actions have settled. */ 263 css_wait_for_slow_path(); 264 265 mutex_lock(&chp->lock); 266 chp_update_desc(chp); 267 mutex_unlock(&chp->lock); 268 269 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link); 270 } 271 272 static int __s390_process_res_acc(struct subchannel *sch, void *data) 273 { 274 spin_lock_irq(&sch->lock); 275 if (sch->driver && sch->driver->chp_event) 276 sch->driver->chp_event(sch, data, CHP_ONLINE); 277 spin_unlock_irq(&sch->lock); 278 279 return 0; 280 } 281 282 static void s390_process_res_acc(struct chp_link *link) 283 { 284 char dbf_txt[15]; 285 286 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid, 287 link->chpid.id); 288 CIO_TRACE_EVENT( 2, dbf_txt); 289 if (link->fla != 0) { 290 sprintf(dbf_txt, "fla%x", link->fla); 291 CIO_TRACE_EVENT( 2, dbf_txt); 292 } 293 /* Wait until previous actions have settled. */ 294 css_wait_for_slow_path(); 295 /* 296 * I/O resources may have become accessible. 297 * Scan through all subchannels that may be concerned and 298 * do a validation on those. 299 * The more information we have (info), the less scanning 300 * will we have to do. 301 */ 302 for_each_subchannel_staged(__s390_process_res_acc, NULL, link); 303 css_schedule_reprobe(); 304 } 305 306 static int process_fces_event(struct subchannel *sch, void *data) 307 { 308 spin_lock_irq(&sch->lock); 309 if (sch->driver && sch->driver->chp_event) 310 sch->driver->chp_event(sch, data, CHP_FCES_EVENT); 311 spin_unlock_irq(&sch->lock); 312 return 0; 313 } 314 315 struct chsc_sei_nt0_area { 316 u8 flags; 317 u8 vf; /* validity flags */ 318 u8 rs; /* reporting source */ 319 u8 cc; /* content code */ 320 u16 fla; /* full link address */ 321 u16 rsid; /* reporting source id */ 322 u32 reserved1; 323 u32 reserved2; 324 /* ccdf has to be big enough for a link-incident record */ 325 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */ 326 } __packed; 327 328 struct chsc_sei_nt2_area { 329 u8 flags; /* p and v bit */ 330 u8 reserved1; 331 u8 reserved2; 332 u8 cc; /* content code */ 333 u32 reserved3[13]; 334 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */ 335 } __packed; 336 337 #define CHSC_SEI_NT0 (1ULL << 63) 338 #define CHSC_SEI_NT2 (1ULL << 61) 339 340 struct chsc_sei { 341 struct chsc_header request; 342 u32 reserved1; 343 u64 ntsm; /* notification type mask */ 344 struct chsc_header response; 345 u32 :24; 346 u8 nt; 347 union { 348 struct chsc_sei_nt0_area nt0_area; 349 struct chsc_sei_nt2_area nt2_area; 350 u8 nt_area[PAGE_SIZE - 24]; 351 } u; 352 } __packed __aligned(PAGE_SIZE); 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 EBCDIC 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 static void chsc_link_from_sei(struct chp_link *link, 393 struct chsc_sei_nt0_area *sei_area) 394 { 395 if ((sei_area->vf & SEI_VF_FLA) != 0) { 396 link->fla = sei_area->fla; 397 link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ? 398 0xffff : 0xff00; 399 } 400 } 401 402 /* Format node ID and parameters for output in LIR log message. */ 403 static void format_node_data(char *params, char *id, struct node_descriptor *nd) 404 { 405 memset(params, 0, PARAMS_LEN); 406 memset(id, 0, NODEID_LEN); 407 408 if (nd->validity != ND_VALIDITY_VALID) { 409 strscpy(params, "n/a", PARAMS_LEN); 410 strscpy(id, "n/a", NODEID_LEN); 411 return; 412 } 413 414 /* PARAMS=xx,xxxxxx */ 415 snprintf(params, PARAMS_LEN, "%02x,%06x", nd->byte0, nd->params); 416 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */ 417 id = store_ebcdic(id, nd->type, sizeof(nd->type), '/'); 418 id = store_ebcdic(id, nd->model, sizeof(nd->model), ','); 419 id = store_ebcdic(id, nd->manufacturer, sizeof(nd->manufacturer), '.'); 420 id = store_ebcdic(id, nd->plant, sizeof(nd->plant), 0); 421 id = store_ebcdic(id, nd->seq, sizeof(nd->seq), ','); 422 sprintf(id, "%04X", nd->tag); 423 } 424 425 static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area) 426 { 427 struct lir *lir = (struct lir *) &sei_area->ccdf; 428 char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN], 429 aunodeid[NODEID_LEN]; 430 431 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n", 432 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]); 433 434 /* Ignore NULL Link Incident Records. */ 435 if (lir->iq.null) 436 return; 437 438 /* Inform user that a link requires maintenance actions because it has 439 * become degraded or not operational. Note that this log message is 440 * the primary intention behind a Link Incident Record. */ 441 442 format_node_data(iuparams, iunodeid, &lir->incident_node); 443 format_node_data(auparams, aunodeid, &lir->attached_node); 444 445 switch (lir->iq.class) { 446 case LIR_IQ_CLASS_DEGRADED: 447 pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x " 448 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", 449 sei_area->rs, sei_area->rsid, lir->ic, iuparams, 450 iunodeid, auparams, aunodeid); 451 break; 452 case LIR_IQ_CLASS_NOT_OPERATIONAL: 453 pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x " 454 "IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n", 455 sei_area->rs, sei_area->rsid, lir->ic, iuparams, 456 iunodeid, auparams, aunodeid); 457 break; 458 default: 459 break; 460 } 461 } 462 463 static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) 464 { 465 struct channel_path *chp; 466 struct chp_link link; 467 struct chp_id chpid; 468 int status; 469 470 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, " 471 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid); 472 if (sei_area->rs != 4) 473 return; 474 chp_id_init(&chpid); 475 chpid.id = sei_area->rsid; 476 /* allocate a new channel path structure, if needed */ 477 status = chp_get_status(chpid); 478 if (!status) 479 return; 480 481 if (status < 0) { 482 chp_new(chpid); 483 } else { 484 chp = chpid_to_chp(chpid); 485 mutex_lock(&chp->lock); 486 chp_update_desc(chp); 487 mutex_unlock(&chp->lock); 488 } 489 memset(&link, 0, sizeof(struct chp_link)); 490 link.chpid = chpid; 491 chsc_link_from_sei(&link, sei_area); 492 s390_process_res_acc(&link); 493 } 494 495 static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area) 496 { 497 struct channel_path *chp; 498 struct chp_id chpid; 499 u8 *data; 500 int num; 501 502 CIO_CRW_EVENT(4, "chsc: channel path availability information\n"); 503 if (sei_area->rs != 0) 504 return; 505 data = sei_area->ccdf; 506 chp_id_init(&chpid); 507 for (num = 0; num <= __MAX_CHPID; num++) { 508 if (!chp_test_bit(data, num)) 509 continue; 510 chpid.id = num; 511 512 CIO_CRW_EVENT(4, "Update information for channel path " 513 "%x.%02x\n", chpid.cssid, chpid.id); 514 chp = chpid_to_chp(chpid); 515 if (!chp) { 516 chp_new(chpid); 517 continue; 518 } 519 mutex_lock(&chp->lock); 520 chp_update_desc(chp); 521 mutex_unlock(&chp->lock); 522 } 523 } 524 525 struct chp_config_data { 526 u8 map[32]; 527 u8 op; 528 u8 pc; 529 }; 530 531 static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area) 532 { 533 struct chp_config_data *data; 534 struct chp_id chpid; 535 int num; 536 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"}; 537 538 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n"); 539 if (sei_area->rs != 0) 540 return; 541 data = (struct chp_config_data *) &(sei_area->ccdf); 542 chp_id_init(&chpid); 543 for (num = 0; num <= __MAX_CHPID; num++) { 544 if (!chp_test_bit(data->map, num)) 545 continue; 546 chpid.id = num; 547 pr_notice("Processing %s for channel path %x.%02x\n", 548 events[data->op], chpid.cssid, chpid.id); 549 switch (data->op) { 550 case 0: 551 chp_cfg_schedule(chpid, 1); 552 break; 553 case 1: 554 chp_cfg_schedule(chpid, 0); 555 break; 556 case 2: 557 chp_cfg_cancel_deconfigure(chpid); 558 break; 559 } 560 } 561 } 562 563 static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area) 564 { 565 int ret; 566 567 CIO_CRW_EVENT(4, "chsc: scm change notification\n"); 568 if (sei_area->rs != 7) 569 return; 570 571 ret = scm_update_information(); 572 if (ret) 573 CIO_CRW_EVENT(0, "chsc: updating change notification" 574 " failed (rc=%d).\n", ret); 575 } 576 577 static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area) 578 { 579 int ret; 580 581 CIO_CRW_EVENT(4, "chsc: scm available information\n"); 582 if (sei_area->rs != 7) 583 return; 584 585 ret = scm_process_availability_information(); 586 if (ret) 587 CIO_CRW_EVENT(0, "chsc: process availability information" 588 " failed (rc=%d).\n", ret); 589 } 590 591 static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area) 592 { 593 CIO_CRW_EVENT(3, "chsc: ap config changed\n"); 594 if (sei_area->rs != 5) 595 return; 596 597 blocking_notifier_call_chain(&chsc_notifiers, 598 CHSC_NOTIFY_AP_CFG, NULL); 599 } 600 601 static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area) 602 { 603 struct chp_link link; 604 struct chp_id chpid; 605 struct channel_path *chp; 606 607 CIO_CRW_EVENT(4, 608 "chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n", 609 sei_area->rs, sei_area->rsid, sei_area->ccdf[0]); 610 611 if (sei_area->rs != SEI_RS_CHPID) 612 return; 613 chp_id_init(&chpid); 614 chpid.id = sei_area->rsid; 615 616 /* Ignore the event on unknown/invalid chp */ 617 chp = chpid_to_chp(chpid); 618 if (!chp) 619 return; 620 621 memset(&link, 0, sizeof(struct chp_link)); 622 link.chpid = chpid; 623 chsc_link_from_sei(&link, sei_area); 624 625 for_each_subchannel_staged(process_fces_event, NULL, &link); 626 } 627 628 static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area) 629 { 630 switch (sei_area->cc) { 631 case 1: 632 zpci_event_error(sei_area->ccdf); 633 break; 634 case 2: 635 zpci_event_availability(sei_area->ccdf); 636 break; 637 default: 638 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n", 639 sei_area->cc); 640 break; 641 } 642 } 643 644 static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area) 645 { 646 /* which kind of information was stored? */ 647 switch (sei_area->cc) { 648 case 1: /* link incident*/ 649 chsc_process_sei_link_incident(sei_area); 650 break; 651 case 2: /* i/o resource accessibility */ 652 chsc_process_sei_res_acc(sei_area); 653 break; 654 case 3: /* ap config changed */ 655 chsc_process_sei_ap_cfg_chg(sei_area); 656 break; 657 case 7: /* channel-path-availability information */ 658 chsc_process_sei_chp_avail(sei_area); 659 break; 660 case 8: /* channel-path-configuration notification */ 661 chsc_process_sei_chp_config(sei_area); 662 break; 663 case 12: /* scm change notification */ 664 chsc_process_sei_scm_change(sei_area); 665 break; 666 case 14: /* scm available notification */ 667 chsc_process_sei_scm_avail(sei_area); 668 break; 669 case 15: /* FCES event notification */ 670 chsc_process_sei_fces_event(sei_area); 671 break; 672 default: /* other stuff */ 673 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n", 674 sei_area->cc); 675 break; 676 } 677 678 /* Check if we might have lost some information. */ 679 if (sei_area->flags & 0x40) { 680 CIO_CRW_EVENT(2, "chsc: event overflow\n"); 681 css_schedule_eval_all(); 682 } 683 } 684 685 static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm) 686 { 687 static int ntsm_unsupported; 688 689 while (true) { 690 memset(sei, 0, sizeof(*sei)); 691 sei->request.length = 0x0010; 692 sei->request.code = 0x000e; 693 if (!ntsm_unsupported) 694 sei->ntsm = ntsm; 695 696 if (chsc(sei)) 697 break; 698 699 if (sei->response.code != 0x0001) { 700 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n", 701 sei->response.code, sei->ntsm); 702 703 if (sei->response.code == 3 && sei->ntsm) { 704 /* Fallback for old firmware. */ 705 ntsm_unsupported = 1; 706 continue; 707 } 708 break; 709 } 710 711 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt); 712 switch (sei->nt) { 713 case 0: 714 chsc_process_sei_nt0(&sei->u.nt0_area); 715 break; 716 case 2: 717 chsc_process_sei_nt2(&sei->u.nt2_area); 718 break; 719 default: 720 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt); 721 break; 722 } 723 724 if (!(sei->u.nt0_area.flags & 0x80)) 725 break; 726 } 727 } 728 729 /* 730 * Handle channel subsystem related CRWs. 731 * Use store event information to find out what's going on. 732 * 733 * Note: Access to sei_page is serialized through machine check handler 734 * thread, so no need for locking. 735 */ 736 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow) 737 { 738 struct chsc_sei *sei = sei_page; 739 740 if (overflow) { 741 css_schedule_eval_all(); 742 return; 743 } 744 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " 745 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", 746 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, 747 crw0->erc, crw0->rsid); 748 749 CIO_TRACE_EVENT(2, "prcss"); 750 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2); 751 } 752 753 void chsc_chp_online(struct chp_id chpid) 754 { 755 struct channel_path *chp = chpid_to_chp(chpid); 756 struct chp_link link; 757 char dbf_txt[15]; 758 759 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id); 760 CIO_TRACE_EVENT(2, dbf_txt); 761 762 if (chp_get_status(chpid) != 0) { 763 memset(&link, 0, sizeof(struct chp_link)); 764 link.chpid = chpid; 765 /* Wait until previous actions have settled. */ 766 css_wait_for_slow_path(); 767 768 mutex_lock(&chp->lock); 769 chp_update_desc(chp); 770 mutex_unlock(&chp->lock); 771 772 for_each_subchannel_staged(__s390_process_res_acc, NULL, 773 &link); 774 css_schedule_reprobe(); 775 } 776 } 777 778 static void __s390_subchannel_vary_chpid(struct subchannel *sch, 779 struct chp_id chpid, int on) 780 { 781 unsigned long flags; 782 struct chp_link link; 783 784 memset(&link, 0, sizeof(struct chp_link)); 785 link.chpid = chpid; 786 spin_lock_irqsave(&sch->lock, flags); 787 if (sch->driver && sch->driver->chp_event) 788 sch->driver->chp_event(sch, &link, 789 on ? CHP_VARY_ON : CHP_VARY_OFF); 790 spin_unlock_irqrestore(&sch->lock, flags); 791 } 792 793 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data) 794 { 795 struct chp_id *chpid = data; 796 797 __s390_subchannel_vary_chpid(sch, *chpid, 0); 798 return 0; 799 } 800 801 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data) 802 { 803 struct chp_id *chpid = data; 804 805 __s390_subchannel_vary_chpid(sch, *chpid, 1); 806 return 0; 807 } 808 809 /** 810 * chsc_chp_vary - propagate channel-path vary operation to subchannels 811 * @chpid: channl-path ID 812 * @on: non-zero for vary online, zero for vary offline 813 */ 814 int chsc_chp_vary(struct chp_id chpid, int on) 815 { 816 struct channel_path *chp = chpid_to_chp(chpid); 817 818 /* 819 * Redo PathVerification on the devices the chpid connects to 820 */ 821 if (on) { 822 /* Try to update the channel path description. */ 823 chp_update_desc(chp); 824 for_each_subchannel_staged(s390_subchannel_vary_chpid_on, 825 NULL, &chpid); 826 css_schedule_reprobe(); 827 } else 828 for_each_subchannel_staged(s390_subchannel_vary_chpid_off, 829 NULL, &chpid); 830 831 return 0; 832 } 833 834 static void 835 chsc_remove_cmg_attr(struct channel_subsystem *css) 836 { 837 int i; 838 839 for (i = 0; i <= __MAX_CHPID; i++) { 840 if (!css->chps[i]) 841 continue; 842 chp_remove_cmg_attr(css->chps[i]); 843 } 844 } 845 846 static int 847 chsc_add_cmg_attr(struct channel_subsystem *css) 848 { 849 int i, ret; 850 851 ret = 0; 852 for (i = 0; i <= __MAX_CHPID; i++) { 853 if (!css->chps[i]) 854 continue; 855 ret = chp_add_cmg_attr(css->chps[i]); 856 if (ret) 857 goto cleanup; 858 } 859 return ret; 860 cleanup: 861 while (i--) { 862 if (!css->chps[i]) 863 continue; 864 chp_remove_cmg_attr(css->chps[i]); 865 } 866 return ret; 867 } 868 869 int __chsc_do_secm(struct channel_subsystem *css, int enable) 870 { 871 struct { 872 struct chsc_header request; 873 u32 operation_code : 2; 874 u32 : 1; 875 u32 e : 1; 876 u32 : 28; 877 u32 key : 4; 878 u32 : 28; 879 dma64_t cub[CSS_NUM_CUB_PAGES]; 880 dma64_t ecub[CSS_NUM_ECUB_PAGES]; 881 u32 reserved[5]; 882 struct chsc_header response; 883 u32 status : 8; 884 u32 : 4; 885 u32 fmt : 4; 886 u32 : 16; 887 } __packed *secm_area; 888 unsigned long flags; 889 int ret, ccode, i; 890 891 spin_lock_irqsave(&chsc_page_lock, flags); 892 memset(chsc_page, 0, PAGE_SIZE); 893 secm_area = chsc_page; 894 secm_area->request.length = 0x0050; 895 secm_area->request.code = 0x0016; 896 897 secm_area->key = PAGE_DEFAULT_KEY >> 4; 898 secm_area->e = 1; 899 900 for (i = 0; i < CSS_NUM_CUB_PAGES; i++) 901 secm_area->cub[i] = (__force dma64_t)virt_to_dma32(css->cub[i]); 902 for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) 903 secm_area->ecub[i] = virt_to_dma64(css->ecub[i]); 904 905 secm_area->operation_code = enable ? 0 : 1; 906 907 ccode = chsc(secm_area); 908 if (ccode > 0) { 909 ret = (ccode == 3) ? -ENODEV : -EBUSY; 910 goto out; 911 } 912 913 switch (secm_area->response.code) { 914 case 0x0102: 915 case 0x0103: 916 ret = -EINVAL; 917 break; 918 default: 919 ret = chsc_error_from_response(secm_area->response.code); 920 } 921 if (ret != 0) 922 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n", 923 secm_area->response.code); 924 out: 925 spin_unlock_irqrestore(&chsc_page_lock, flags); 926 return ret; 927 } 928 929 static int cub_alloc(struct channel_subsystem *css) 930 { 931 int i; 932 933 for (i = 0; i < CSS_NUM_CUB_PAGES; i++) { 934 css->cub[i] = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); 935 if (!css->cub[i]) 936 return -ENOMEM; 937 } 938 for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) { 939 css->ecub[i] = (void *)get_zeroed_page(GFP_KERNEL); 940 if (!css->ecub[i]) 941 return -ENOMEM; 942 } 943 944 return 0; 945 } 946 947 static void cub_free(struct channel_subsystem *css) 948 { 949 int i; 950 951 for (i = 0; i < CSS_NUM_CUB_PAGES; i++) { 952 free_page((unsigned long)css->cub[i]); 953 css->cub[i] = NULL; 954 } 955 for (i = 0; i < CSS_NUM_ECUB_PAGES; i++) { 956 free_page((unsigned long)css->ecub[i]); 957 css->ecub[i] = NULL; 958 } 959 } 960 961 int 962 chsc_secm(struct channel_subsystem *css, int enable) 963 { 964 int ret; 965 966 if (enable && !css->cm_enabled) { 967 ret = cub_alloc(css); 968 if (ret) 969 goto out; 970 } 971 ret = __chsc_do_secm(css, enable); 972 if (!ret) { 973 css->cm_enabled = enable; 974 if (css->cm_enabled) { 975 ret = chsc_add_cmg_attr(css); 976 if (ret) { 977 __chsc_do_secm(css, 0); 978 css->cm_enabled = 0; 979 } 980 } else 981 chsc_remove_cmg_attr(css); 982 } 983 984 out: 985 if (!css->cm_enabled) 986 cub_free(css); 987 988 return ret; 989 } 990 991 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt, 992 int c, int m, void *page) 993 { 994 struct chsc_scpd *scpd_area; 995 int ccode, ret; 996 997 if ((rfmt == 1 || rfmt == 0) && c == 1 && 998 !css_general_characteristics.fcs) 999 return -EINVAL; 1000 if ((rfmt == 2) && !css_general_characteristics.cib) 1001 return -EINVAL; 1002 if ((rfmt == 3) && !css_general_characteristics.util_str) 1003 return -EINVAL; 1004 1005 memset(page, 0, PAGE_SIZE); 1006 scpd_area = page; 1007 scpd_area->request.length = 0x0010; 1008 scpd_area->request.code = 0x0002; 1009 scpd_area->cssid = chpid.cssid; 1010 scpd_area->first_chpid = chpid.id; 1011 scpd_area->last_chpid = chpid.id; 1012 scpd_area->m = m; 1013 scpd_area->c = c; 1014 scpd_area->fmt = fmt; 1015 scpd_area->rfmt = rfmt; 1016 1017 ccode = chsc(scpd_area); 1018 if (ccode > 0) 1019 return (ccode == 3) ? -ENODEV : -EBUSY; 1020 1021 ret = chsc_error_from_response(scpd_area->response.code); 1022 if (ret) 1023 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n", 1024 scpd_area->response.code); 1025 return ret; 1026 } 1027 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc); 1028 1029 #define chsc_det_chp_desc(FMT, c) \ 1030 int chsc_determine_fmt##FMT##_channel_path_desc( \ 1031 struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \ 1032 { \ 1033 struct chsc_scpd *scpd_area; \ 1034 unsigned long flags; \ 1035 int ret; \ 1036 \ 1037 spin_lock_irqsave(&chsc_page_lock, flags); \ 1038 scpd_area = chsc_page; \ 1039 ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \ 1040 scpd_area); \ 1041 if (ret) \ 1042 goto out; \ 1043 \ 1044 memcpy(desc, scpd_area->data, sizeof(*desc)); \ 1045 out: \ 1046 spin_unlock_irqrestore(&chsc_page_lock, flags); \ 1047 return ret; \ 1048 } 1049 1050 chsc_det_chp_desc(0, 0) 1051 chsc_det_chp_desc(1, 1) 1052 chsc_det_chp_desc(3, 0) 1053 1054 static void 1055 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, 1056 struct cmg_chars *chars) 1057 { 1058 int i, mask; 1059 1060 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { 1061 mask = 0x80 >> (i + 3); 1062 if (cmcv & mask) 1063 chp->cmg_chars.values[i] = chars->values[i]; 1064 else 1065 chp->cmg_chars.values[i] = 0; 1066 } 1067 } 1068 1069 static unsigned long scmc_get_speed(u32 s, u32 p) 1070 { 1071 unsigned long speed = s; 1072 1073 if (!p) 1074 p = 8; 1075 while (p--) 1076 speed *= 10; 1077 1078 return speed; 1079 } 1080 1081 int chsc_get_channel_measurement_chars(struct channel_path *chp) 1082 { 1083 unsigned long flags; 1084 int ccode, ret; 1085 1086 struct { 1087 struct chsc_header request; 1088 u32 : 24; 1089 u32 first_chpid : 8; 1090 u32 : 24; 1091 u32 last_chpid : 8; 1092 u32 zeroes1; 1093 struct chsc_header response; 1094 u32 zeroes2; 1095 struct cmg_cmcb cmcb; 1096 } *scmc_area; 1097 1098 chp->shared = -1; 1099 chp->cmg = -1; 1100 chp->extended = 0; 1101 chp->speed = 0; 1102 1103 if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm) 1104 return -EINVAL; 1105 1106 spin_lock_irqsave(&chsc_page_lock, flags); 1107 memset(chsc_page, 0, PAGE_SIZE); 1108 scmc_area = chsc_page; 1109 scmc_area->request.length = 0x0010; 1110 scmc_area->request.code = 0x0022; 1111 scmc_area->first_chpid = chp->chpid.id; 1112 scmc_area->last_chpid = chp->chpid.id; 1113 1114 ccode = chsc(scmc_area); 1115 if (ccode > 0) { 1116 ret = (ccode == 3) ? -ENODEV : -EBUSY; 1117 goto out; 1118 } 1119 1120 ret = chsc_error_from_response(scmc_area->response.code); 1121 if (ret) { 1122 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n", 1123 scmc_area->response.code); 1124 goto out; 1125 } 1126 chp->cmcb = scmc_area->cmcb; 1127 if (scmc_area->cmcb.not_valid) 1128 goto out; 1129 1130 chp->cmg = scmc_area->cmcb.cmg; 1131 chp->shared = scmc_area->cmcb.shared; 1132 chp->extended = scmc_area->cmcb.extended; 1133 chp->speed = scmc_get_speed(scmc_area->cmcb.cmgs, scmc_area->cmcb.cmgp); 1134 chsc_initialize_cmg_chars(chp, scmc_area->cmcb.cmcv, 1135 (struct cmg_chars *)&scmc_area->cmcb.data); 1136 out: 1137 spin_unlock_irqrestore(&chsc_page_lock, flags); 1138 return ret; 1139 } 1140 1141 int __init chsc_init(void) 1142 { 1143 int ret; 1144 1145 sei_page = (void *)get_zeroed_page(GFP_KERNEL); 1146 chsc_page = (void *)get_zeroed_page(GFP_KERNEL); 1147 if (!sei_page || !chsc_page) { 1148 ret = -ENOMEM; 1149 goto out_err; 1150 } 1151 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw); 1152 if (ret) 1153 goto out_err; 1154 return ret; 1155 out_err: 1156 free_page((unsigned long)chsc_page); 1157 free_page((unsigned long)sei_page); 1158 return ret; 1159 } 1160 1161 void __init chsc_init_cleanup(void) 1162 { 1163 crw_unregister_handler(CRW_RSC_CSS); 1164 free_page((unsigned long)chsc_page); 1165 free_page((unsigned long)sei_page); 1166 } 1167 1168 int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code) 1169 { 1170 int ret; 1171 1172 sda_area->request.length = 0x0400; 1173 sda_area->request.code = 0x0031; 1174 sda_area->operation_code = operation_code; 1175 1176 ret = chsc(sda_area); 1177 if (ret > 0) { 1178 ret = (ret == 3) ? -ENODEV : -EBUSY; 1179 goto out; 1180 } 1181 1182 switch (sda_area->response.code) { 1183 case 0x0101: 1184 ret = -EOPNOTSUPP; 1185 break; 1186 default: 1187 ret = chsc_error_from_response(sda_area->response.code); 1188 } 1189 out: 1190 return ret; 1191 } 1192 1193 int chsc_enable_facility(int operation_code) 1194 { 1195 struct chsc_sda_area *sda_area; 1196 unsigned long flags; 1197 int ret; 1198 1199 spin_lock_irqsave(&chsc_page_lock, flags); 1200 memset(chsc_page, 0, PAGE_SIZE); 1201 sda_area = chsc_page; 1202 1203 ret = __chsc_enable_facility(sda_area, operation_code); 1204 if (ret != 0) 1205 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n", 1206 operation_code, sda_area->response.code); 1207 1208 spin_unlock_irqrestore(&chsc_page_lock, flags); 1209 return ret; 1210 } 1211 1212 int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid) 1213 { 1214 struct { 1215 struct chsc_header request; 1216 u8 atype; 1217 u32 : 24; 1218 u32 reserved1[6]; 1219 struct chsc_header response; 1220 u32 reserved2[3]; 1221 struct { 1222 u8 cssid; 1223 u8 iid; 1224 u32 : 16; 1225 } list[]; 1226 } *sdcal_area; 1227 int ret; 1228 1229 spin_lock_irq(&chsc_page_lock); 1230 memset(chsc_page, 0, PAGE_SIZE); 1231 sdcal_area = chsc_page; 1232 sdcal_area->request.length = 0x0020; 1233 sdcal_area->request.code = 0x0034; 1234 sdcal_area->atype = 4; 1235 1236 ret = chsc(sdcal_area); 1237 if (ret) { 1238 ret = (ret == 3) ? -ENODEV : -EBUSY; 1239 goto exit; 1240 } 1241 1242 ret = chsc_error_from_response(sdcal_area->response.code); 1243 if (ret) { 1244 CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n", 1245 sdcal_area->response.code); 1246 goto exit; 1247 } 1248 1249 if ((addr_t) &sdcal_area->list[idx] < 1250 (addr_t) &sdcal_area->response + sdcal_area->response.length) { 1251 *cssid = sdcal_area->list[idx].cssid; 1252 *iid = sdcal_area->list[idx].iid; 1253 } 1254 else 1255 ret = -ENODEV; 1256 exit: 1257 spin_unlock_irq(&chsc_page_lock); 1258 return ret; 1259 } 1260 1261 struct css_general_char css_general_characteristics; 1262 struct css_chsc_char css_chsc_characteristics; 1263 1264 int __init 1265 chsc_determine_css_characteristics(void) 1266 { 1267 unsigned long flags; 1268 int result; 1269 struct { 1270 struct chsc_header request; 1271 u32 reserved1; 1272 u32 reserved2; 1273 u32 reserved3; 1274 struct chsc_header response; 1275 u32 reserved4; 1276 u32 general_char[510]; 1277 u32 chsc_char[508]; 1278 } *scsc_area; 1279 1280 spin_lock_irqsave(&chsc_page_lock, flags); 1281 memset(chsc_page, 0, PAGE_SIZE); 1282 scsc_area = chsc_page; 1283 scsc_area->request.length = 0x0010; 1284 scsc_area->request.code = 0x0010; 1285 1286 result = chsc(scsc_area); 1287 if (result) { 1288 result = (result == 3) ? -ENODEV : -EBUSY; 1289 goto exit; 1290 } 1291 1292 result = chsc_error_from_response(scsc_area->response.code); 1293 if (result == 0) { 1294 memcpy(&css_general_characteristics, scsc_area->general_char, 1295 sizeof(css_general_characteristics)); 1296 memcpy(&css_chsc_characteristics, scsc_area->chsc_char, 1297 sizeof(css_chsc_characteristics)); 1298 } else 1299 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n", 1300 scsc_area->response.code); 1301 exit: 1302 spin_unlock_irqrestore(&chsc_page_lock, flags); 1303 return result; 1304 } 1305 1306 EXPORT_SYMBOL_GPL(css_general_characteristics); 1307 EXPORT_SYMBOL_GPL(css_chsc_characteristics); 1308 1309 int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta) 1310 { 1311 struct { 1312 struct chsc_header request; 1313 unsigned int rsvd0; 1314 unsigned int op : 8; 1315 unsigned int rsvd1 : 8; 1316 unsigned int ctrl : 16; 1317 unsigned int rsvd2[5]; 1318 struct chsc_header response; 1319 unsigned int rsvd3[3]; 1320 s64 clock_delta; 1321 unsigned int rsvd4[2]; 1322 } *rr; 1323 int rc; 1324 1325 memset(page, 0, PAGE_SIZE); 1326 rr = page; 1327 rr->request.length = 0x0020; 1328 rr->request.code = 0x0033; 1329 rr->op = op; 1330 rr->ctrl = ctrl; 1331 rc = chsc(rr); 1332 if (rc) 1333 return -EIO; 1334 rc = (rr->response.code == 0x0001) ? 0 : -EIO; 1335 if (clock_delta) 1336 *clock_delta = rr->clock_delta; 1337 return rc; 1338 } 1339 1340 int chsc_sstpi(void *page, void *result, size_t size) 1341 { 1342 struct { 1343 struct chsc_header request; 1344 unsigned int rsvd0[3]; 1345 struct chsc_header response; 1346 char data[]; 1347 } *rr; 1348 int rc; 1349 1350 memset(page, 0, PAGE_SIZE); 1351 rr = page; 1352 rr->request.length = 0x0010; 1353 rr->request.code = 0x0038; 1354 rc = chsc(rr); 1355 if (rc) 1356 return -EIO; 1357 memcpy(result, &rr->data, size); 1358 return (rr->response.code == 0x0001) ? 0 : -EIO; 1359 } 1360 1361 int chsc_stzi(void *page, void *result, size_t size) 1362 { 1363 struct { 1364 struct chsc_header request; 1365 unsigned int rsvd0[3]; 1366 struct chsc_header response; 1367 char data[]; 1368 } *rr; 1369 int rc; 1370 1371 memset(page, 0, PAGE_SIZE); 1372 rr = page; 1373 rr->request.length = 0x0010; 1374 rr->request.code = 0x003e; 1375 rc = chsc(rr); 1376 if (rc) 1377 return -EIO; 1378 memcpy(result, &rr->data, size); 1379 return (rr->response.code == 0x0001) ? 0 : -EIO; 1380 } 1381 1382 int chsc_siosl(struct subchannel_id schid) 1383 { 1384 struct { 1385 struct chsc_header request; 1386 u32 word1; 1387 struct subchannel_id sid; 1388 u32 word3; 1389 struct chsc_header response; 1390 u32 word[11]; 1391 } *siosl_area; 1392 unsigned long flags; 1393 int ccode; 1394 int rc; 1395 1396 spin_lock_irqsave(&chsc_page_lock, flags); 1397 memset(chsc_page, 0, PAGE_SIZE); 1398 siosl_area = chsc_page; 1399 siosl_area->request.length = 0x0010; 1400 siosl_area->request.code = 0x0046; 1401 siosl_area->word1 = 0x80000000; 1402 siosl_area->sid = schid; 1403 1404 ccode = chsc(siosl_area); 1405 if (ccode > 0) { 1406 if (ccode == 3) 1407 rc = -ENODEV; 1408 else 1409 rc = -EBUSY; 1410 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n", 1411 schid.ssid, schid.sch_no, ccode); 1412 goto out; 1413 } 1414 rc = chsc_error_from_response(siosl_area->response.code); 1415 if (rc) 1416 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n", 1417 schid.ssid, schid.sch_no, 1418 siosl_area->response.code); 1419 else 1420 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n", 1421 schid.ssid, schid.sch_no); 1422 out: 1423 spin_unlock_irqrestore(&chsc_page_lock, flags); 1424 return rc; 1425 } 1426 EXPORT_SYMBOL_GPL(chsc_siosl); 1427 1428 /** 1429 * chsc_scm_info() - store SCM information (SSI) 1430 * @scm_area: request and response block for SSI 1431 * @token: continuation token 1432 * 1433 * Returns 0 on success. 1434 */ 1435 int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token) 1436 { 1437 int ccode, ret; 1438 1439 memset(scm_area, 0, sizeof(*scm_area)); 1440 scm_area->request.length = 0x0020; 1441 scm_area->request.code = 0x004C; 1442 scm_area->reqtok = token; 1443 1444 ccode = chsc(scm_area); 1445 if (ccode > 0) { 1446 ret = (ccode == 3) ? -ENODEV : -EBUSY; 1447 goto out; 1448 } 1449 ret = chsc_error_from_response(scm_area->response.code); 1450 if (ret != 0) 1451 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n", 1452 scm_area->response.code); 1453 out: 1454 return ret; 1455 } 1456 EXPORT_SYMBOL_GPL(chsc_scm_info); 1457 1458 /** 1459 * chsc_pnso() - Perform Network-Subchannel Operation 1460 * @schid: id of the subchannel on which PNSO is performed 1461 * @pnso_area: request and response block for the operation 1462 * @oc: Operation Code 1463 * @resume_token: resume token for multiblock response 1464 * @cnc: Boolean change-notification control 1465 * 1466 * pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL) 1467 * 1468 * Returns 0 on success. 1469 */ 1470 int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area, 1471 u8 oc, struct chsc_pnso_resume_token resume_token, int cnc) 1472 { 1473 memset(pnso_area, 0, sizeof(*pnso_area)); 1474 pnso_area->request.length = 0x0030; 1475 pnso_area->request.code = 0x003d; /* network-subchannel operation */ 1476 pnso_area->m = schid.m; 1477 pnso_area->ssid = schid.ssid; 1478 pnso_area->sch = schid.sch_no; 1479 pnso_area->cssid = schid.cssid; 1480 pnso_area->oc = oc; 1481 pnso_area->resume_token = resume_token; 1482 pnso_area->n = (cnc != 0); 1483 if (chsc(pnso_area)) 1484 return -EIO; 1485 return chsc_error_from_response(pnso_area->response.code); 1486 } 1487 1488 int chsc_sgib(u32 origin) 1489 { 1490 struct { 1491 struct chsc_header request; 1492 u16 op; 1493 u8 reserved01[2]; 1494 u8 reserved02:4; 1495 u8 fmt:4; 1496 u8 reserved03[7]; 1497 /* operation data area begin */ 1498 u8 reserved04[4]; 1499 u32 gib_origin; 1500 u8 reserved05[10]; 1501 u8 aix; 1502 u8 reserved06[4029]; 1503 struct chsc_header response; 1504 u8 reserved07[4]; 1505 } *sgib_area; 1506 int ret; 1507 1508 spin_lock_irq(&chsc_page_lock); 1509 memset(chsc_page, 0, PAGE_SIZE); 1510 sgib_area = chsc_page; 1511 sgib_area->request.length = 0x0fe0; 1512 sgib_area->request.code = 0x0021; 1513 sgib_area->op = 0x1; 1514 sgib_area->gib_origin = origin; 1515 1516 ret = chsc(sgib_area); 1517 if (ret == 0) 1518 ret = chsc_error_from_response(sgib_area->response.code); 1519 spin_unlock_irq(&chsc_page_lock); 1520 1521 return ret; 1522 } 1523 EXPORT_SYMBOL_GPL(chsc_sgib); 1524 1525 #define SCUD_REQ_LEN 0x10 /* SCUD request block length */ 1526 #define SCUD_REQ_CMD 0x4b /* SCUD Command Code */ 1527 1528 struct chse_cudb { 1529 u16 flags:8; 1530 u16 chp_valid:8; 1531 u16 cu; 1532 u32 esm_valid:8; 1533 u32:24; 1534 u8 chpid[8]; 1535 u32:32; 1536 u32:32; 1537 u8 esm[8]; 1538 u32 efla[8]; 1539 } __packed; 1540 1541 struct chsc_scud { 1542 struct chsc_header request; 1543 u16:4; 1544 u16 fmt:4; 1545 u16 cssid:8; 1546 u16 first_cu; 1547 u16:16; 1548 u16 last_cu; 1549 u32:32; 1550 struct chsc_header response; 1551 u16:4; 1552 u16 fmt_resp:4; 1553 u32:24; 1554 struct chse_cudb cudb[]; 1555 } __packed; 1556 1557 /** 1558 * chsc_scud() - Store control-unit description. 1559 * @cu: number of the control-unit 1560 * @esm: 8 1-byte endpoint security mode values 1561 * @esm_valid: validity mask for @esm 1562 * 1563 * Interface to retrieve information about the endpoint security 1564 * modes for up to 8 paths of a control unit. 1565 * 1566 * Returns 0 on success. 1567 */ 1568 int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid) 1569 { 1570 struct chsc_scud *scud = chsc_page; 1571 int ret; 1572 1573 spin_lock_irq(&chsc_page_lock); 1574 memset(chsc_page, 0, PAGE_SIZE); 1575 scud->request.length = SCUD_REQ_LEN; 1576 scud->request.code = SCUD_REQ_CMD; 1577 scud->fmt = 0; 1578 scud->cssid = 0; 1579 scud->first_cu = cu; 1580 scud->last_cu = cu; 1581 1582 ret = chsc(scud); 1583 if (!ret) 1584 ret = chsc_error_from_response(scud->response.code); 1585 1586 if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0 1587 || !(scud->cudb[0].flags & 0x80) 1588 || scud->cudb[0].cu != cu)) { 1589 1590 CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x " 1591 "FMT=%04x, cudb.flags=%02x, cudb.cu=%04x", 1592 scud->response.code, scud->response.length, 1593 scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu); 1594 ret = -EINVAL; 1595 } 1596 1597 if (ret) 1598 goto out; 1599 1600 memcpy(esm, scud->cudb[0].esm, sizeof(*esm)); 1601 *esm_valid = scud->cudb[0].esm_valid; 1602 out: 1603 spin_unlock_irq(&chsc_page_lock); 1604 return ret; 1605 } 1606 EXPORT_SYMBOL_GPL(chsc_scud); 1607