1 /* 2 * Channel subsystem base support. 3 * 4 * Copyright 2012 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or (at 8 * your option) any later version. See the COPYING file in the top-level 9 * directory. 10 */ 11 12 #include "qemu/osdep.h" 13 #include "qapi/error.h" 14 #include "qapi/visitor.h" 15 #include "qemu/bitops.h" 16 #include "qemu/error-report.h" 17 #include "exec/address-spaces.h" 18 #include "cpu.h" 19 #include "hw/s390x/ioinst.h" 20 #include "hw/qdev-properties.h" 21 #include "hw/s390x/css.h" 22 #include "trace.h" 23 #include "hw/s390x/s390_flic.h" 24 #include "hw/s390x/s390-virtio-ccw.h" 25 #include "hw/s390x/s390-ccw.h" 26 27 typedef struct CrwContainer { 28 CRW crw; 29 QTAILQ_ENTRY(CrwContainer) sibling; 30 } CrwContainer; 31 32 static const VMStateDescription vmstate_crw = { 33 .name = "s390_crw", 34 .version_id = 1, 35 .minimum_version_id = 1, 36 .fields = (VMStateField[]) { 37 VMSTATE_UINT16(flags, CRW), 38 VMSTATE_UINT16(rsid, CRW), 39 VMSTATE_END_OF_LIST() 40 }, 41 }; 42 43 static const VMStateDescription vmstate_crw_container = { 44 .name = "s390_crw_container", 45 .version_id = 1, 46 .minimum_version_id = 1, 47 .fields = (VMStateField[]) { 48 VMSTATE_STRUCT(crw, CrwContainer, 0, vmstate_crw, CRW), 49 VMSTATE_END_OF_LIST() 50 }, 51 }; 52 53 typedef struct ChpInfo { 54 uint8_t in_use; 55 uint8_t type; 56 uint8_t is_virtual; 57 } ChpInfo; 58 59 static const VMStateDescription vmstate_chp_info = { 60 .name = "s390_chp_info", 61 .version_id = 1, 62 .minimum_version_id = 1, 63 .fields = (VMStateField[]) { 64 VMSTATE_UINT8(in_use, ChpInfo), 65 VMSTATE_UINT8(type, ChpInfo), 66 VMSTATE_UINT8(is_virtual, ChpInfo), 67 VMSTATE_END_OF_LIST() 68 } 69 }; 70 71 typedef struct SubchSet { 72 SubchDev *sch[MAX_SCHID + 1]; 73 unsigned long schids_used[BITS_TO_LONGS(MAX_SCHID + 1)]; 74 unsigned long devnos_used[BITS_TO_LONGS(MAX_SCHID + 1)]; 75 } SubchSet; 76 77 static const VMStateDescription vmstate_scsw = { 78 .name = "s390_scsw", 79 .version_id = 1, 80 .minimum_version_id = 1, 81 .fields = (VMStateField[]) { 82 VMSTATE_UINT16(flags, SCSW), 83 VMSTATE_UINT16(ctrl, SCSW), 84 VMSTATE_UINT32(cpa, SCSW), 85 VMSTATE_UINT8(dstat, SCSW), 86 VMSTATE_UINT8(cstat, SCSW), 87 VMSTATE_UINT16(count, SCSW), 88 VMSTATE_END_OF_LIST() 89 } 90 }; 91 92 static const VMStateDescription vmstate_pmcw = { 93 .name = "s390_pmcw", 94 .version_id = 1, 95 .minimum_version_id = 1, 96 .fields = (VMStateField[]) { 97 VMSTATE_UINT32(intparm, PMCW), 98 VMSTATE_UINT16(flags, PMCW), 99 VMSTATE_UINT16(devno, PMCW), 100 VMSTATE_UINT8(lpm, PMCW), 101 VMSTATE_UINT8(pnom, PMCW), 102 VMSTATE_UINT8(lpum, PMCW), 103 VMSTATE_UINT8(pim, PMCW), 104 VMSTATE_UINT16(mbi, PMCW), 105 VMSTATE_UINT8(pom, PMCW), 106 VMSTATE_UINT8(pam, PMCW), 107 VMSTATE_UINT8_ARRAY(chpid, PMCW, 8), 108 VMSTATE_UINT32(chars, PMCW), 109 VMSTATE_END_OF_LIST() 110 } 111 }; 112 113 static const VMStateDescription vmstate_schib = { 114 .name = "s390_schib", 115 .version_id = 1, 116 .minimum_version_id = 1, 117 .fields = (VMStateField[]) { 118 VMSTATE_STRUCT(pmcw, SCHIB, 0, vmstate_pmcw, PMCW), 119 VMSTATE_STRUCT(scsw, SCHIB, 0, vmstate_scsw, SCSW), 120 VMSTATE_UINT64(mba, SCHIB), 121 VMSTATE_UINT8_ARRAY(mda, SCHIB, 4), 122 VMSTATE_END_OF_LIST() 123 } 124 }; 125 126 127 static const VMStateDescription vmstate_ccw1 = { 128 .name = "s390_ccw1", 129 .version_id = 1, 130 .minimum_version_id = 1, 131 .fields = (VMStateField[]) { 132 VMSTATE_UINT8(cmd_code, CCW1), 133 VMSTATE_UINT8(flags, CCW1), 134 VMSTATE_UINT16(count, CCW1), 135 VMSTATE_UINT32(cda, CCW1), 136 VMSTATE_END_OF_LIST() 137 } 138 }; 139 140 static const VMStateDescription vmstate_ciw = { 141 .name = "s390_ciw", 142 .version_id = 1, 143 .minimum_version_id = 1, 144 .fields = (VMStateField[]) { 145 VMSTATE_UINT8(type, CIW), 146 VMSTATE_UINT8(command, CIW), 147 VMSTATE_UINT16(count, CIW), 148 VMSTATE_END_OF_LIST() 149 } 150 }; 151 152 static const VMStateDescription vmstate_sense_id = { 153 .name = "s390_sense_id", 154 .version_id = 1, 155 .minimum_version_id = 1, 156 .fields = (VMStateField[]) { 157 VMSTATE_UINT8(reserved, SenseId), 158 VMSTATE_UINT16(cu_type, SenseId), 159 VMSTATE_UINT8(cu_model, SenseId), 160 VMSTATE_UINT16(dev_type, SenseId), 161 VMSTATE_UINT8(dev_model, SenseId), 162 VMSTATE_UINT8(unused, SenseId), 163 VMSTATE_STRUCT_ARRAY(ciw, SenseId, MAX_CIWS, 0, vmstate_ciw, CIW), 164 VMSTATE_END_OF_LIST() 165 } 166 }; 167 168 static const VMStateDescription vmstate_orb = { 169 .name = "s390_orb", 170 .version_id = 1, 171 .minimum_version_id = 1, 172 .fields = (VMStateField[]) { 173 VMSTATE_UINT32(intparm, ORB), 174 VMSTATE_UINT16(ctrl0, ORB), 175 VMSTATE_UINT8(lpm, ORB), 176 VMSTATE_UINT8(ctrl1, ORB), 177 VMSTATE_UINT32(cpa, ORB), 178 VMSTATE_END_OF_LIST() 179 } 180 }; 181 182 static bool vmstate_schdev_orb_needed(void *opaque) 183 { 184 return css_migration_enabled(); 185 } 186 187 static const VMStateDescription vmstate_schdev_orb = { 188 .name = "s390_subch_dev/orb", 189 .version_id = 1, 190 .minimum_version_id = 1, 191 .needed = vmstate_schdev_orb_needed, 192 .fields = (VMStateField[]) { 193 VMSTATE_STRUCT(orb, SubchDev, 1, vmstate_orb, ORB), 194 VMSTATE_END_OF_LIST() 195 } 196 }; 197 198 static int subch_dev_post_load(void *opaque, int version_id); 199 static int subch_dev_pre_save(void *opaque); 200 201 const char err_hint_devno[] = "Devno mismatch, tried to load wrong section!" 202 " Likely reason: some sequences of plug and unplug can break" 203 " migration for machine versions prior to 2.7 (known design flaw)."; 204 205 const VMStateDescription vmstate_subch_dev = { 206 .name = "s390_subch_dev", 207 .version_id = 1, 208 .minimum_version_id = 1, 209 .post_load = subch_dev_post_load, 210 .pre_save = subch_dev_pre_save, 211 .fields = (VMStateField[]) { 212 VMSTATE_UINT8_EQUAL(cssid, SubchDev, "Bug!"), 213 VMSTATE_UINT8_EQUAL(ssid, SubchDev, "Bug!"), 214 VMSTATE_UINT16(migrated_schid, SubchDev), 215 VMSTATE_UINT16_EQUAL(devno, SubchDev, err_hint_devno), 216 VMSTATE_BOOL(thinint_active, SubchDev), 217 VMSTATE_STRUCT(curr_status, SubchDev, 0, vmstate_schib, SCHIB), 218 VMSTATE_UINT8_ARRAY(sense_data, SubchDev, 32), 219 VMSTATE_UINT64(channel_prog, SubchDev), 220 VMSTATE_STRUCT(last_cmd, SubchDev, 0, vmstate_ccw1, CCW1), 221 VMSTATE_BOOL(last_cmd_valid, SubchDev), 222 VMSTATE_STRUCT(id, SubchDev, 0, vmstate_sense_id, SenseId), 223 VMSTATE_BOOL(ccw_fmt_1, SubchDev), 224 VMSTATE_UINT8(ccw_no_data_cnt, SubchDev), 225 VMSTATE_END_OF_LIST() 226 }, 227 .subsections = (const VMStateDescription * []) { 228 &vmstate_schdev_orb, 229 NULL 230 } 231 }; 232 233 typedef struct IndAddrPtrTmp { 234 IndAddr **parent; 235 uint64_t addr; 236 int32_t len; 237 } IndAddrPtrTmp; 238 239 static int post_load_ind_addr(void *opaque, int version_id) 240 { 241 IndAddrPtrTmp *ptmp = opaque; 242 IndAddr **ind_addr = ptmp->parent; 243 244 if (ptmp->len != 0) { 245 *ind_addr = get_indicator(ptmp->addr, ptmp->len); 246 } else { 247 *ind_addr = NULL; 248 } 249 return 0; 250 } 251 252 static int pre_save_ind_addr(void *opaque) 253 { 254 IndAddrPtrTmp *ptmp = opaque; 255 IndAddr *ind_addr = *(ptmp->parent); 256 257 if (ind_addr != NULL) { 258 ptmp->len = ind_addr->len; 259 ptmp->addr = ind_addr->addr; 260 } else { 261 ptmp->len = 0; 262 ptmp->addr = 0L; 263 } 264 265 return 0; 266 } 267 268 const VMStateDescription vmstate_ind_addr_tmp = { 269 .name = "s390_ind_addr_tmp", 270 .pre_save = pre_save_ind_addr, 271 .post_load = post_load_ind_addr, 272 273 .fields = (VMStateField[]) { 274 VMSTATE_INT32(len, IndAddrPtrTmp), 275 VMSTATE_UINT64(addr, IndAddrPtrTmp), 276 VMSTATE_END_OF_LIST() 277 } 278 }; 279 280 const VMStateDescription vmstate_ind_addr = { 281 .name = "s390_ind_addr_tmp", 282 .fields = (VMStateField[]) { 283 VMSTATE_WITH_TMP(IndAddr*, IndAddrPtrTmp, vmstate_ind_addr_tmp), 284 VMSTATE_END_OF_LIST() 285 } 286 }; 287 288 typedef struct CssImage { 289 SubchSet *sch_set[MAX_SSID + 1]; 290 ChpInfo chpids[MAX_CHPID + 1]; 291 } CssImage; 292 293 static const VMStateDescription vmstate_css_img = { 294 .name = "s390_css_img", 295 .version_id = 1, 296 .minimum_version_id = 1, 297 .fields = (VMStateField[]) { 298 /* Subchannel sets have no relevant state. */ 299 VMSTATE_STRUCT_ARRAY(chpids, CssImage, MAX_CHPID + 1, 0, 300 vmstate_chp_info, ChpInfo), 301 VMSTATE_END_OF_LIST() 302 } 303 304 }; 305 306 typedef struct IoAdapter { 307 uint32_t id; 308 uint8_t type; 309 uint8_t isc; 310 uint8_t flags; 311 } IoAdapter; 312 313 typedef struct ChannelSubSys { 314 QTAILQ_HEAD(, CrwContainer) pending_crws; 315 bool sei_pending; 316 bool do_crw_mchk; 317 bool crws_lost; 318 uint8_t max_cssid; 319 uint8_t max_ssid; 320 bool chnmon_active; 321 uint64_t chnmon_area; 322 CssImage *css[MAX_CSSID + 1]; 323 uint8_t default_cssid; 324 /* don't migrate, see css_register_io_adapters */ 325 IoAdapter *io_adapters[CSS_IO_ADAPTER_TYPE_NUMS][MAX_ISC + 1]; 326 /* don't migrate, see get_indicator and IndAddrPtrTmp */ 327 QTAILQ_HEAD(, IndAddr) indicator_addresses; 328 } ChannelSubSys; 329 330 static const VMStateDescription vmstate_css = { 331 .name = "s390_css", 332 .version_id = 1, 333 .minimum_version_id = 1, 334 .fields = (VMStateField[]) { 335 VMSTATE_QTAILQ_V(pending_crws, ChannelSubSys, 1, vmstate_crw_container, 336 CrwContainer, sibling), 337 VMSTATE_BOOL(sei_pending, ChannelSubSys), 338 VMSTATE_BOOL(do_crw_mchk, ChannelSubSys), 339 VMSTATE_BOOL(crws_lost, ChannelSubSys), 340 /* These were kind of migrated by virtio */ 341 VMSTATE_UINT8(max_cssid, ChannelSubSys), 342 VMSTATE_UINT8(max_ssid, ChannelSubSys), 343 VMSTATE_BOOL(chnmon_active, ChannelSubSys), 344 VMSTATE_UINT64(chnmon_area, ChannelSubSys), 345 VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(css, ChannelSubSys, MAX_CSSID + 1, 346 0, vmstate_css_img, CssImage), 347 VMSTATE_UINT8(default_cssid, ChannelSubSys), 348 VMSTATE_END_OF_LIST() 349 } 350 }; 351 352 static ChannelSubSys channel_subsys = { 353 .pending_crws = QTAILQ_HEAD_INITIALIZER(channel_subsys.pending_crws), 354 .do_crw_mchk = true, 355 .sei_pending = false, 356 .do_crw_mchk = true, 357 .crws_lost = false, 358 .chnmon_active = false, 359 .indicator_addresses = 360 QTAILQ_HEAD_INITIALIZER(channel_subsys.indicator_addresses), 361 }; 362 363 static int subch_dev_pre_save(void *opaque) 364 { 365 SubchDev *s = opaque; 366 367 /* Prepare remote_schid for save */ 368 s->migrated_schid = s->schid; 369 370 return 0; 371 } 372 373 static int subch_dev_post_load(void *opaque, int version_id) 374 { 375 376 SubchDev *s = opaque; 377 378 /* Re-assign the subchannel to remote_schid if necessary */ 379 if (s->migrated_schid != s->schid) { 380 if (css_find_subch(true, s->cssid, s->ssid, s->schid) == s) { 381 /* 382 * Cleanup the slot before moving to s->migrated_schid provided 383 * it still belongs to us, i.e. it was not changed by previous 384 * invocation of this function. 385 */ 386 css_subch_assign(s->cssid, s->ssid, s->schid, s->devno, NULL); 387 } 388 /* It's OK to re-assign without a prior de-assign. */ 389 s->schid = s->migrated_schid; 390 css_subch_assign(s->cssid, s->ssid, s->schid, s->devno, s); 391 } 392 393 if (css_migration_enabled()) { 394 /* No compat voodoo to do ;) */ 395 return 0; 396 } 397 /* 398 * Hack alert. If we don't migrate the channel subsystem status 399 * we still need to find out if the guest enabled mss/mcss-e. 400 * If the subchannel is enabled, it certainly was able to access it, 401 * so adjust the max_ssid/max_cssid values for relevant ssid/cssid 402 * values. This is not watertight, but better than nothing. 403 */ 404 if (s->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA) { 405 if (s->ssid) { 406 channel_subsys.max_ssid = MAX_SSID; 407 } 408 if (s->cssid != channel_subsys.default_cssid) { 409 channel_subsys.max_cssid = MAX_CSSID; 410 } 411 } 412 return 0; 413 } 414 415 void css_register_vmstate(void) 416 { 417 vmstate_register(NULL, 0, &vmstate_css, &channel_subsys); 418 } 419 420 IndAddr *get_indicator(hwaddr ind_addr, int len) 421 { 422 IndAddr *indicator; 423 424 QTAILQ_FOREACH(indicator, &channel_subsys.indicator_addresses, sibling) { 425 if (indicator->addr == ind_addr) { 426 indicator->refcnt++; 427 return indicator; 428 } 429 } 430 indicator = g_new0(IndAddr, 1); 431 indicator->addr = ind_addr; 432 indicator->len = len; 433 indicator->refcnt = 1; 434 QTAILQ_INSERT_TAIL(&channel_subsys.indicator_addresses, 435 indicator, sibling); 436 return indicator; 437 } 438 439 static int s390_io_adapter_map(AdapterInfo *adapter, uint64_t map_addr, 440 bool do_map) 441 { 442 S390FLICState *fs = s390_get_flic(); 443 S390FLICStateClass *fsc = s390_get_flic_class(fs); 444 445 return fsc->io_adapter_map(fs, adapter->adapter_id, map_addr, do_map); 446 } 447 448 void release_indicator(AdapterInfo *adapter, IndAddr *indicator) 449 { 450 assert(indicator->refcnt > 0); 451 indicator->refcnt--; 452 if (indicator->refcnt > 0) { 453 return; 454 } 455 QTAILQ_REMOVE(&channel_subsys.indicator_addresses, indicator, sibling); 456 if (indicator->map) { 457 s390_io_adapter_map(adapter, indicator->map, false); 458 } 459 g_free(indicator); 460 } 461 462 int map_indicator(AdapterInfo *adapter, IndAddr *indicator) 463 { 464 int ret; 465 466 if (indicator->map) { 467 return 0; /* already mapped is not an error */ 468 } 469 indicator->map = indicator->addr; 470 ret = s390_io_adapter_map(adapter, indicator->map, true); 471 if ((ret != 0) && (ret != -ENOSYS)) { 472 goto out_err; 473 } 474 return 0; 475 476 out_err: 477 indicator->map = 0; 478 return ret; 479 } 480 481 int css_create_css_image(uint8_t cssid, bool default_image) 482 { 483 trace_css_new_image(cssid, default_image ? "(default)" : ""); 484 /* 255 is reserved */ 485 if (cssid == 255) { 486 return -EINVAL; 487 } 488 if (channel_subsys.css[cssid]) { 489 return -EBUSY; 490 } 491 channel_subsys.css[cssid] = g_new0(CssImage, 1); 492 if (default_image) { 493 channel_subsys.default_cssid = cssid; 494 } 495 return 0; 496 } 497 498 uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc) 499 { 500 if (type >= CSS_IO_ADAPTER_TYPE_NUMS || isc > MAX_ISC || 501 !channel_subsys.io_adapters[type][isc]) { 502 return -1; 503 } 504 505 return channel_subsys.io_adapters[type][isc]->id; 506 } 507 508 /** 509 * css_register_io_adapters: Register I/O adapters per ISC during init 510 * 511 * @swap: an indication if byte swap is needed. 512 * @maskable: an indication if the adapter is subject to the mask operation. 513 * @flags: further characteristics of the adapter. 514 * e.g. suppressible, an indication if the adapter is subject to AIS. 515 * @errp: location to store error information. 516 */ 517 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable, 518 uint8_t flags, Error **errp) 519 { 520 uint32_t id; 521 int ret, isc; 522 IoAdapter *adapter; 523 S390FLICState *fs = s390_get_flic(); 524 S390FLICStateClass *fsc = s390_get_flic_class(fs); 525 526 /* 527 * Disallow multiple registrations for the same device type. 528 * Report an error if registering for an already registered type. 529 */ 530 if (channel_subsys.io_adapters[type][0]) { 531 error_setg(errp, "Adapters for type %d already registered", type); 532 } 533 534 for (isc = 0; isc <= MAX_ISC; isc++) { 535 id = (type << 3) | isc; 536 ret = fsc->register_io_adapter(fs, id, isc, swap, maskable, flags); 537 if (ret == 0) { 538 adapter = g_new0(IoAdapter, 1); 539 adapter->id = id; 540 adapter->isc = isc; 541 adapter->type = type; 542 adapter->flags = flags; 543 channel_subsys.io_adapters[type][isc] = adapter; 544 } else { 545 error_setg_errno(errp, -ret, "Unexpected error %d when " 546 "registering adapter %d", ret, id); 547 break; 548 } 549 } 550 551 /* 552 * No need to free registered adapters in kvm: kvm will clean up 553 * when the machine goes away. 554 */ 555 if (ret) { 556 for (isc--; isc >= 0; isc--) { 557 g_free(channel_subsys.io_adapters[type][isc]); 558 channel_subsys.io_adapters[type][isc] = NULL; 559 } 560 } 561 562 } 563 564 static void css_clear_io_interrupt(uint16_t subchannel_id, 565 uint16_t subchannel_nr) 566 { 567 Error *err = NULL; 568 static bool no_clear_irq; 569 S390FLICState *fs = s390_get_flic(); 570 S390FLICStateClass *fsc = s390_get_flic_class(fs); 571 int r; 572 573 if (unlikely(no_clear_irq)) { 574 return; 575 } 576 r = fsc->clear_io_irq(fs, subchannel_id, subchannel_nr); 577 switch (r) { 578 case 0: 579 break; 580 case -ENOSYS: 581 no_clear_irq = true; 582 /* 583 * Ignore unavailability, as the user can't do anything 584 * about it anyway. 585 */ 586 break; 587 default: 588 error_setg_errno(&err, -r, "unexpected error condition"); 589 error_propagate(&error_abort, err); 590 } 591 } 592 593 static inline uint16_t css_do_build_subchannel_id(uint8_t cssid, uint8_t ssid) 594 { 595 if (channel_subsys.max_cssid > 0) { 596 return (cssid << 8) | (1 << 3) | (ssid << 1) | 1; 597 } 598 return (ssid << 1) | 1; 599 } 600 601 uint16_t css_build_subchannel_id(SubchDev *sch) 602 { 603 return css_do_build_subchannel_id(sch->cssid, sch->ssid); 604 } 605 606 void css_inject_io_interrupt(SubchDev *sch) 607 { 608 uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11; 609 610 trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid, 611 sch->curr_status.pmcw.intparm, isc, ""); 612 s390_io_interrupt(css_build_subchannel_id(sch), 613 sch->schid, 614 sch->curr_status.pmcw.intparm, 615 isc << 27); 616 } 617 618 void css_conditional_io_interrupt(SubchDev *sch) 619 { 620 /* 621 * If the subchannel is not enabled, it is not made status pending 622 * (see PoP p. 16-17, "Status Control"). 623 */ 624 if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA)) { 625 return; 626 } 627 628 /* 629 * If the subchannel is not currently status pending, make it pending 630 * with alert status. 631 */ 632 if (!(sch->curr_status.scsw.ctrl & SCSW_STCTL_STATUS_PEND)) { 633 uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11; 634 635 trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid, 636 sch->curr_status.pmcw.intparm, isc, 637 "(unsolicited)"); 638 sch->curr_status.scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 639 sch->curr_status.scsw.ctrl |= 640 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 641 /* Inject an I/O interrupt. */ 642 s390_io_interrupt(css_build_subchannel_id(sch), 643 sch->schid, 644 sch->curr_status.pmcw.intparm, 645 isc << 27); 646 } 647 } 648 649 int css_do_sic(CPUS390XState *env, uint8_t isc, uint16_t mode) 650 { 651 S390FLICState *fs = s390_get_flic(); 652 S390FLICStateClass *fsc = s390_get_flic_class(fs); 653 int r; 654 655 if (env->psw.mask & PSW_MASK_PSTATE) { 656 r = -PGM_PRIVILEGED; 657 goto out; 658 } 659 660 trace_css_do_sic(mode, isc); 661 switch (mode) { 662 case SIC_IRQ_MODE_ALL: 663 case SIC_IRQ_MODE_SINGLE: 664 break; 665 default: 666 r = -PGM_OPERAND; 667 goto out; 668 } 669 670 r = fsc->modify_ais_mode(fs, isc, mode) ? -PGM_OPERATION : 0; 671 out: 672 return r; 673 } 674 675 void css_adapter_interrupt(CssIoAdapterType type, uint8_t isc) 676 { 677 S390FLICState *fs = s390_get_flic(); 678 S390FLICStateClass *fsc = s390_get_flic_class(fs); 679 uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI; 680 IoAdapter *adapter = channel_subsys.io_adapters[type][isc]; 681 682 if (!adapter) { 683 return; 684 } 685 686 trace_css_adapter_interrupt(isc); 687 if (fs->ais_supported) { 688 if (fsc->inject_airq(fs, type, isc, adapter->flags)) { 689 error_report("Failed to inject airq with AIS supported"); 690 exit(1); 691 } 692 } else { 693 s390_io_interrupt(0, 0, 0, io_int_word); 694 } 695 } 696 697 static void sch_handle_clear_func(SubchDev *sch) 698 { 699 SCHIB *schib = &sch->curr_status; 700 int path; 701 702 /* Path management: In our simple css, we always choose the only path. */ 703 path = 0x80; 704 705 /* Reset values prior to 'issuing the clear signal'. */ 706 schib->pmcw.lpum = 0; 707 schib->pmcw.pom = 0xff; 708 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO; 709 710 /* We always 'attempt to issue the clear signal', and we always succeed. */ 711 sch->channel_prog = 0x0; 712 sch->last_cmd_valid = false; 713 schib->scsw.ctrl &= ~SCSW_ACTL_CLEAR_PEND; 714 schib->scsw.ctrl |= SCSW_STCTL_STATUS_PEND; 715 716 schib->scsw.dstat = 0; 717 schib->scsw.cstat = 0; 718 schib->pmcw.lpum = path; 719 720 } 721 722 static void sch_handle_halt_func(SubchDev *sch) 723 { 724 SCHIB *schib = &sch->curr_status; 725 hwaddr curr_ccw = sch->channel_prog; 726 int path; 727 728 /* Path management: In our simple css, we always choose the only path. */ 729 path = 0x80; 730 731 /* We always 'attempt to issue the halt signal', and we always succeed. */ 732 sch->channel_prog = 0x0; 733 sch->last_cmd_valid = false; 734 schib->scsw.ctrl &= ~SCSW_ACTL_HALT_PEND; 735 schib->scsw.ctrl |= SCSW_STCTL_STATUS_PEND; 736 737 if ((schib->scsw.ctrl & (SCSW_ACTL_SUBCH_ACTIVE | 738 SCSW_ACTL_DEVICE_ACTIVE)) || 739 !((schib->scsw.ctrl & SCSW_ACTL_START_PEND) || 740 (schib->scsw.ctrl & SCSW_ACTL_SUSP))) { 741 schib->scsw.dstat = SCSW_DSTAT_DEVICE_END; 742 } 743 if ((schib->scsw.ctrl & (SCSW_ACTL_SUBCH_ACTIVE | 744 SCSW_ACTL_DEVICE_ACTIVE)) || 745 (schib->scsw.ctrl & SCSW_ACTL_SUSP)) { 746 schib->scsw.cpa = curr_ccw + 8; 747 } 748 schib->scsw.cstat = 0; 749 schib->pmcw.lpum = path; 750 751 } 752 753 /* 754 * As the SenseId struct cannot be packed (would cause unaligned accesses), we 755 * have to copy the individual fields to an unstructured area using the correct 756 * layout (see SA22-7204-01 "Common I/O-Device Commands"). 757 */ 758 static void copy_sense_id_to_guest(uint8_t *dest, SenseId *src) 759 { 760 int i; 761 762 dest[0] = src->reserved; 763 stw_be_p(dest + 1, src->cu_type); 764 dest[3] = src->cu_model; 765 stw_be_p(dest + 4, src->dev_type); 766 dest[6] = src->dev_model; 767 dest[7] = src->unused; 768 for (i = 0; i < ARRAY_SIZE(src->ciw); i++) { 769 dest[8 + i * 4] = src->ciw[i].type; 770 dest[9 + i * 4] = src->ciw[i].command; 771 stw_be_p(dest + 10 + i * 4, src->ciw[i].count); 772 } 773 } 774 775 static CCW1 copy_ccw_from_guest(hwaddr addr, bool fmt1) 776 { 777 CCW0 tmp0; 778 CCW1 tmp1; 779 CCW1 ret; 780 781 if (fmt1) { 782 cpu_physical_memory_read(addr, &tmp1, sizeof(tmp1)); 783 ret.cmd_code = tmp1.cmd_code; 784 ret.flags = tmp1.flags; 785 ret.count = be16_to_cpu(tmp1.count); 786 ret.cda = be32_to_cpu(tmp1.cda); 787 } else { 788 cpu_physical_memory_read(addr, &tmp0, sizeof(tmp0)); 789 if ((tmp0.cmd_code & 0x0f) == CCW_CMD_TIC) { 790 ret.cmd_code = CCW_CMD_TIC; 791 ret.flags = 0; 792 ret.count = 0; 793 } else { 794 ret.cmd_code = tmp0.cmd_code; 795 ret.flags = tmp0.flags; 796 ret.count = be16_to_cpu(tmp0.count); 797 } 798 ret.cda = be16_to_cpu(tmp0.cda1) | (tmp0.cda0 << 16); 799 } 800 return ret; 801 } 802 /** 803 * If out of bounds marks the stream broken. If broken returns -EINVAL, 804 * otherwise the requested length (may be zero) 805 */ 806 static inline int cds_check_len(CcwDataStream *cds, int len) 807 { 808 if (cds->at_byte + len > cds->count) { 809 cds->flags |= CDS_F_STREAM_BROKEN; 810 } 811 return cds->flags & CDS_F_STREAM_BROKEN ? -EINVAL : len; 812 } 813 814 static inline bool cds_ccw_addrs_ok(hwaddr addr, int len, bool ccw_fmt1) 815 { 816 return (addr + len) < (ccw_fmt1 ? (1UL << 31) : (1UL << 24)); 817 } 818 819 static int ccw_dstream_rw_noflags(CcwDataStream *cds, void *buff, int len, 820 CcwDataStreamOp op) 821 { 822 int ret; 823 824 ret = cds_check_len(cds, len); 825 if (ret <= 0) { 826 return ret; 827 } 828 if (!cds_ccw_addrs_ok(cds->cda, len, cds->flags & CDS_F_FMT)) { 829 return -EINVAL; /* channel program check */ 830 } 831 if (op == CDS_OP_A) { 832 goto incr; 833 } 834 if (!cds->do_skip) { 835 ret = address_space_rw(&address_space_memory, cds->cda, 836 MEMTXATTRS_UNSPECIFIED, buff, len, op); 837 } else { 838 ret = MEMTX_OK; 839 } 840 if (ret != MEMTX_OK) { 841 cds->flags |= CDS_F_STREAM_BROKEN; 842 return -EINVAL; 843 } 844 incr: 845 cds->at_byte += len; 846 cds->cda += len; 847 return 0; 848 } 849 850 /* returns values between 1 and bsz, where bsz is a power of 2 */ 851 static inline uint16_t ida_continuous_left(hwaddr cda, uint64_t bsz) 852 { 853 return bsz - (cda & (bsz - 1)); 854 } 855 856 static inline uint64_t ccw_ida_block_size(uint8_t flags) 857 { 858 if ((flags & CDS_F_C64) && !(flags & CDS_F_I2K)) { 859 return 1ULL << 12; 860 } 861 return 1ULL << 11; 862 } 863 864 static inline int ida_read_next_idaw(CcwDataStream *cds) 865 { 866 union {uint64_t fmt2; uint32_t fmt1; } idaw; 867 int ret; 868 hwaddr idaw_addr; 869 bool idaw_fmt2 = cds->flags & CDS_F_C64; 870 bool ccw_fmt1 = cds->flags & CDS_F_FMT; 871 872 if (idaw_fmt2) { 873 idaw_addr = cds->cda_orig + sizeof(idaw.fmt2) * cds->at_idaw; 874 if (idaw_addr & 0x07 || !cds_ccw_addrs_ok(idaw_addr, 0, ccw_fmt1)) { 875 return -EINVAL; /* channel program check */ 876 } 877 ret = address_space_read(&address_space_memory, idaw_addr, 878 MEMTXATTRS_UNSPECIFIED, &idaw.fmt2, 879 sizeof(idaw.fmt2)); 880 cds->cda = be64_to_cpu(idaw.fmt2); 881 } else { 882 idaw_addr = cds->cda_orig + sizeof(idaw.fmt1) * cds->at_idaw; 883 if (idaw_addr & 0x03 || !cds_ccw_addrs_ok(idaw_addr, 0, ccw_fmt1)) { 884 return -EINVAL; /* channel program check */ 885 } 886 ret = address_space_read(&address_space_memory, idaw_addr, 887 MEMTXATTRS_UNSPECIFIED, &idaw.fmt1, 888 sizeof(idaw.fmt1)); 889 cds->cda = be64_to_cpu(idaw.fmt1); 890 if (cds->cda & 0x80000000) { 891 return -EINVAL; /* channel program check */ 892 } 893 } 894 ++(cds->at_idaw); 895 if (ret != MEMTX_OK) { 896 /* assume inaccessible address */ 897 return -EINVAL; /* channel program check */ 898 } 899 return 0; 900 } 901 902 static int ccw_dstream_rw_ida(CcwDataStream *cds, void *buff, int len, 903 CcwDataStreamOp op) 904 { 905 uint64_t bsz = ccw_ida_block_size(cds->flags); 906 int ret = 0; 907 uint16_t cont_left, iter_len; 908 909 ret = cds_check_len(cds, len); 910 if (ret <= 0) { 911 return ret; 912 } 913 if (!cds->at_idaw) { 914 /* read first idaw */ 915 ret = ida_read_next_idaw(cds); 916 if (ret) { 917 goto err; 918 } 919 cont_left = ida_continuous_left(cds->cda, bsz); 920 } else { 921 cont_left = ida_continuous_left(cds->cda, bsz); 922 if (cont_left == bsz) { 923 ret = ida_read_next_idaw(cds); 924 if (ret) { 925 goto err; 926 } 927 if (cds->cda & (bsz - 1)) { 928 ret = -EINVAL; /* channel program check */ 929 goto err; 930 } 931 } 932 } 933 do { 934 iter_len = MIN(len, cont_left); 935 if (op != CDS_OP_A) { 936 if (!cds->do_skip) { 937 ret = address_space_rw(&address_space_memory, cds->cda, 938 MEMTXATTRS_UNSPECIFIED, buff, iter_len, 939 op); 940 } else { 941 ret = MEMTX_OK; 942 } 943 if (ret != MEMTX_OK) { 944 /* assume inaccessible address */ 945 ret = -EINVAL; /* channel program check */ 946 goto err; 947 } 948 } 949 cds->at_byte += iter_len; 950 cds->cda += iter_len; 951 len -= iter_len; 952 if (!len) { 953 break; 954 } 955 ret = ida_read_next_idaw(cds); 956 if (ret) { 957 goto err; 958 } 959 cont_left = bsz; 960 } while (true); 961 return ret; 962 err: 963 cds->flags |= CDS_F_STREAM_BROKEN; 964 return ret; 965 } 966 967 void ccw_dstream_init(CcwDataStream *cds, CCW1 const *ccw, ORB const *orb) 968 { 969 /* 970 * We don't support MIDA (an optional facility) yet and we 971 * catch this earlier. Just for expressing the precondition. 972 */ 973 g_assert(!(orb->ctrl1 & ORB_CTRL1_MASK_MIDAW)); 974 cds->flags = (orb->ctrl0 & ORB_CTRL0_MASK_I2K ? CDS_F_I2K : 0) | 975 (orb->ctrl0 & ORB_CTRL0_MASK_C64 ? CDS_F_C64 : 0) | 976 (orb->ctrl0 & ORB_CTRL0_MASK_FMT ? CDS_F_FMT : 0) | 977 (ccw->flags & CCW_FLAG_IDA ? CDS_F_IDA : 0); 978 979 cds->count = ccw->count; 980 cds->cda_orig = ccw->cda; 981 /* skip is only effective for read, read backwards, or sense commands */ 982 cds->do_skip = (ccw->flags & CCW_FLAG_SKIP) && 983 ((ccw->cmd_code & 0x0f) == CCW_CMD_BASIC_SENSE || 984 (ccw->cmd_code & 0x03) == 0x02 /* read */ || 985 (ccw->cmd_code & 0x0f) == 0x0c /* read backwards */); 986 ccw_dstream_rewind(cds); 987 if (!(cds->flags & CDS_F_IDA)) { 988 cds->op_handler = ccw_dstream_rw_noflags; 989 } else { 990 cds->op_handler = ccw_dstream_rw_ida; 991 } 992 } 993 994 static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr, 995 bool suspend_allowed) 996 { 997 int ret; 998 bool check_len; 999 int len; 1000 CCW1 ccw; 1001 1002 if (!ccw_addr) { 1003 return -EINVAL; /* channel-program check */ 1004 } 1005 /* Check doubleword aligned and 31 or 24 (fmt 0) bit addressable. */ 1006 if (ccw_addr & (sch->ccw_fmt_1 ? 0x80000007 : 0xff000007)) { 1007 return -EINVAL; 1008 } 1009 1010 /* Translate everything to format-1 ccws - the information is the same. */ 1011 ccw = copy_ccw_from_guest(ccw_addr, sch->ccw_fmt_1); 1012 1013 /* Check for invalid command codes. */ 1014 if ((ccw.cmd_code & 0x0f) == 0) { 1015 return -EINVAL; 1016 } 1017 if (((ccw.cmd_code & 0x0f) == CCW_CMD_TIC) && 1018 ((ccw.cmd_code & 0xf0) != 0)) { 1019 return -EINVAL; 1020 } 1021 if (!sch->ccw_fmt_1 && (ccw.count == 0) && 1022 (ccw.cmd_code != CCW_CMD_TIC)) { 1023 return -EINVAL; 1024 } 1025 1026 /* We don't support MIDA. */ 1027 if (ccw.flags & CCW_FLAG_MIDA) { 1028 return -EINVAL; 1029 } 1030 1031 if (ccw.flags & CCW_FLAG_SUSPEND) { 1032 return suspend_allowed ? -EINPROGRESS : -EINVAL; 1033 } 1034 1035 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 1036 1037 if (!ccw.cda) { 1038 if (sch->ccw_no_data_cnt == 255) { 1039 return -EINVAL; 1040 } 1041 sch->ccw_no_data_cnt++; 1042 } 1043 1044 /* Look at the command. */ 1045 ccw_dstream_init(&sch->cds, &ccw, &(sch->orb)); 1046 switch (ccw.cmd_code) { 1047 case CCW_CMD_NOOP: 1048 /* Nothing to do. */ 1049 ret = 0; 1050 break; 1051 case CCW_CMD_BASIC_SENSE: 1052 if (check_len) { 1053 if (ccw.count != sizeof(sch->sense_data)) { 1054 ret = -EINVAL; 1055 break; 1056 } 1057 } 1058 len = MIN(ccw.count, sizeof(sch->sense_data)); 1059 ccw_dstream_write_buf(&sch->cds, sch->sense_data, len); 1060 sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds); 1061 memset(sch->sense_data, 0, sizeof(sch->sense_data)); 1062 ret = 0; 1063 break; 1064 case CCW_CMD_SENSE_ID: 1065 { 1066 /* According to SA22-7204-01, Sense-ID can store up to 256 bytes */ 1067 uint8_t sense_id[256]; 1068 1069 copy_sense_id_to_guest(sense_id, &sch->id); 1070 /* Sense ID information is device specific. */ 1071 if (check_len) { 1072 if (ccw.count != sizeof(sense_id)) { 1073 ret = -EINVAL; 1074 break; 1075 } 1076 } 1077 len = MIN(ccw.count, sizeof(sense_id)); 1078 /* 1079 * Only indicate 0xff in the first sense byte if we actually 1080 * have enough place to store at least bytes 0-3. 1081 */ 1082 if (len >= 4) { 1083 sense_id[0] = 0xff; 1084 } else { 1085 sense_id[0] = 0; 1086 } 1087 ccw_dstream_write_buf(&sch->cds, sense_id, len); 1088 sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds); 1089 ret = 0; 1090 break; 1091 } 1092 case CCW_CMD_TIC: 1093 if (sch->last_cmd_valid && (sch->last_cmd.cmd_code == CCW_CMD_TIC)) { 1094 ret = -EINVAL; 1095 break; 1096 } 1097 if (ccw.flags || ccw.count) { 1098 /* We have already sanitized these if converted from fmt 0. */ 1099 ret = -EINVAL; 1100 break; 1101 } 1102 sch->channel_prog = ccw.cda; 1103 ret = -EAGAIN; 1104 break; 1105 default: 1106 if (sch->ccw_cb) { 1107 /* Handle device specific commands. */ 1108 ret = sch->ccw_cb(sch, ccw); 1109 } else { 1110 ret = -ENOSYS; 1111 } 1112 break; 1113 } 1114 sch->last_cmd = ccw; 1115 sch->last_cmd_valid = true; 1116 if (ret == 0) { 1117 if (ccw.flags & CCW_FLAG_CC) { 1118 sch->channel_prog += 8; 1119 ret = -EAGAIN; 1120 } 1121 } 1122 1123 return ret; 1124 } 1125 1126 static void sch_handle_start_func_virtual(SubchDev *sch) 1127 { 1128 SCHIB *schib = &sch->curr_status; 1129 int path; 1130 int ret; 1131 bool suspend_allowed; 1132 1133 /* Path management: In our simple css, we always choose the only path. */ 1134 path = 0x80; 1135 1136 if (!(schib->scsw.ctrl & SCSW_ACTL_SUSP)) { 1137 /* Start Function triggered via ssch, i.e. we have an ORB */ 1138 ORB *orb = &sch->orb; 1139 schib->scsw.cstat = 0; 1140 schib->scsw.dstat = 0; 1141 /* Look at the orb and try to execute the channel program. */ 1142 schib->pmcw.intparm = orb->intparm; 1143 if (!(orb->lpm & path)) { 1144 /* Generate a deferred cc 3 condition. */ 1145 schib->scsw.flags |= SCSW_FLAGS_MASK_CC; 1146 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 1147 schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND); 1148 return; 1149 } 1150 sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT); 1151 schib->scsw.flags |= (sch->ccw_fmt_1) ? SCSW_FLAGS_MASK_FMT : 0; 1152 sch->ccw_no_data_cnt = 0; 1153 suspend_allowed = !!(orb->ctrl0 & ORB_CTRL0_MASK_SPND); 1154 } else { 1155 /* Start Function resumed via rsch */ 1156 schib->scsw.ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND); 1157 /* The channel program had been suspended before. */ 1158 suspend_allowed = true; 1159 } 1160 sch->last_cmd_valid = false; 1161 do { 1162 ret = css_interpret_ccw(sch, sch->channel_prog, suspend_allowed); 1163 switch (ret) { 1164 case -EAGAIN: 1165 /* ccw chain, continue processing */ 1166 break; 1167 case 0: 1168 /* success */ 1169 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND; 1170 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 1171 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 1172 SCSW_STCTL_STATUS_PEND; 1173 schib->scsw.dstat = SCSW_DSTAT_CHANNEL_END | SCSW_DSTAT_DEVICE_END; 1174 schib->scsw.cpa = sch->channel_prog + 8; 1175 break; 1176 case -EIO: 1177 /* I/O errors, status depends on specific devices */ 1178 break; 1179 case -ENOSYS: 1180 /* unsupported command, generate unit check (command reject) */ 1181 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND; 1182 schib->scsw.dstat = SCSW_DSTAT_UNIT_CHECK; 1183 /* Set sense bit 0 in ecw0. */ 1184 sch->sense_data[0] = 0x80; 1185 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 1186 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 1187 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 1188 schib->scsw.cpa = sch->channel_prog + 8; 1189 break; 1190 case -EINPROGRESS: 1191 /* channel program has been suspended */ 1192 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND; 1193 schib->scsw.ctrl |= SCSW_ACTL_SUSP; 1194 break; 1195 default: 1196 /* error, generate channel program check */ 1197 schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND; 1198 schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK; 1199 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 1200 schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 1201 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 1202 schib->scsw.cpa = sch->channel_prog + 8; 1203 break; 1204 } 1205 } while (ret == -EAGAIN); 1206 1207 } 1208 1209 static void sch_handle_halt_func_passthrough(SubchDev *sch) 1210 { 1211 int ret; 1212 1213 ret = s390_ccw_halt(sch); 1214 if (ret == -ENOSYS) { 1215 sch_handle_halt_func(sch); 1216 } 1217 } 1218 1219 static void sch_handle_clear_func_passthrough(SubchDev *sch) 1220 { 1221 int ret; 1222 1223 ret = s390_ccw_clear(sch); 1224 if (ret == -ENOSYS) { 1225 sch_handle_clear_func(sch); 1226 } 1227 } 1228 1229 static IOInstEnding sch_handle_start_func_passthrough(SubchDev *sch) 1230 { 1231 SCHIB *schib = &sch->curr_status; 1232 ORB *orb = &sch->orb; 1233 if (!(schib->scsw.ctrl & SCSW_ACTL_SUSP)) { 1234 assert(orb != NULL); 1235 schib->pmcw.intparm = orb->intparm; 1236 } 1237 return s390_ccw_cmd_request(sch); 1238 } 1239 1240 /* 1241 * On real machines, this would run asynchronously to the main vcpus. 1242 * We might want to make some parts of the ssch handling (interpreting 1243 * read/writes) asynchronous later on if we start supporting more than 1244 * our current very simple devices. 1245 */ 1246 IOInstEnding do_subchannel_work_virtual(SubchDev *sch) 1247 { 1248 SCHIB *schib = &sch->curr_status; 1249 1250 if (schib->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) { 1251 sch_handle_clear_func(sch); 1252 } else if (schib->scsw.ctrl & SCSW_FCTL_HALT_FUNC) { 1253 sch_handle_halt_func(sch); 1254 } else if (schib->scsw.ctrl & SCSW_FCTL_START_FUNC) { 1255 /* Triggered by both ssch and rsch. */ 1256 sch_handle_start_func_virtual(sch); 1257 } 1258 css_inject_io_interrupt(sch); 1259 /* inst must succeed if this func is called */ 1260 return IOINST_CC_EXPECTED; 1261 } 1262 1263 IOInstEnding do_subchannel_work_passthrough(SubchDev *sch) 1264 { 1265 SCHIB *schib = &sch->curr_status; 1266 1267 if (schib->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) { 1268 sch_handle_clear_func_passthrough(sch); 1269 } else if (schib->scsw.ctrl & SCSW_FCTL_HALT_FUNC) { 1270 sch_handle_halt_func_passthrough(sch); 1271 } else if (schib->scsw.ctrl & SCSW_FCTL_START_FUNC) { 1272 return sch_handle_start_func_passthrough(sch); 1273 } 1274 return IOINST_CC_EXPECTED; 1275 } 1276 1277 static IOInstEnding do_subchannel_work(SubchDev *sch) 1278 { 1279 if (!sch->do_subchannel_work) { 1280 return IOINST_CC_STATUS_PRESENT; 1281 } 1282 g_assert(sch->curr_status.scsw.ctrl & SCSW_CTRL_MASK_FCTL); 1283 return sch->do_subchannel_work(sch); 1284 } 1285 1286 static void copy_pmcw_to_guest(PMCW *dest, const PMCW *src) 1287 { 1288 int i; 1289 1290 dest->intparm = cpu_to_be32(src->intparm); 1291 dest->flags = cpu_to_be16(src->flags); 1292 dest->devno = cpu_to_be16(src->devno); 1293 dest->lpm = src->lpm; 1294 dest->pnom = src->pnom; 1295 dest->lpum = src->lpum; 1296 dest->pim = src->pim; 1297 dest->mbi = cpu_to_be16(src->mbi); 1298 dest->pom = src->pom; 1299 dest->pam = src->pam; 1300 for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) { 1301 dest->chpid[i] = src->chpid[i]; 1302 } 1303 dest->chars = cpu_to_be32(src->chars); 1304 } 1305 1306 void copy_scsw_to_guest(SCSW *dest, const SCSW *src) 1307 { 1308 dest->flags = cpu_to_be16(src->flags); 1309 dest->ctrl = cpu_to_be16(src->ctrl); 1310 dest->cpa = cpu_to_be32(src->cpa); 1311 dest->dstat = src->dstat; 1312 dest->cstat = src->cstat; 1313 dest->count = cpu_to_be16(src->count); 1314 } 1315 1316 static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src) 1317 { 1318 int i; 1319 /* 1320 * We copy the PMCW and SCSW in and out of local variables to 1321 * avoid taking the address of members of a packed struct. 1322 */ 1323 PMCW src_pmcw, dest_pmcw; 1324 SCSW src_scsw, dest_scsw; 1325 1326 src_pmcw = src->pmcw; 1327 copy_pmcw_to_guest(&dest_pmcw, &src_pmcw); 1328 dest->pmcw = dest_pmcw; 1329 src_scsw = src->scsw; 1330 copy_scsw_to_guest(&dest_scsw, &src_scsw); 1331 dest->scsw = dest_scsw; 1332 dest->mba = cpu_to_be64(src->mba); 1333 for (i = 0; i < ARRAY_SIZE(dest->mda); i++) { 1334 dest->mda[i] = src->mda[i]; 1335 } 1336 } 1337 1338 int css_do_stsch(SubchDev *sch, SCHIB *schib) 1339 { 1340 /* Use current status. */ 1341 copy_schib_to_guest(schib, &sch->curr_status); 1342 return 0; 1343 } 1344 1345 static void copy_pmcw_from_guest(PMCW *dest, const PMCW *src) 1346 { 1347 int i; 1348 1349 dest->intparm = be32_to_cpu(src->intparm); 1350 dest->flags = be16_to_cpu(src->flags); 1351 dest->devno = be16_to_cpu(src->devno); 1352 dest->lpm = src->lpm; 1353 dest->pnom = src->pnom; 1354 dest->lpum = src->lpum; 1355 dest->pim = src->pim; 1356 dest->mbi = be16_to_cpu(src->mbi); 1357 dest->pom = src->pom; 1358 dest->pam = src->pam; 1359 for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) { 1360 dest->chpid[i] = src->chpid[i]; 1361 } 1362 dest->chars = be32_to_cpu(src->chars); 1363 } 1364 1365 static void copy_scsw_from_guest(SCSW *dest, const SCSW *src) 1366 { 1367 dest->flags = be16_to_cpu(src->flags); 1368 dest->ctrl = be16_to_cpu(src->ctrl); 1369 dest->cpa = be32_to_cpu(src->cpa); 1370 dest->dstat = src->dstat; 1371 dest->cstat = src->cstat; 1372 dest->count = be16_to_cpu(src->count); 1373 } 1374 1375 static void copy_schib_from_guest(SCHIB *dest, const SCHIB *src) 1376 { 1377 int i; 1378 /* 1379 * We copy the PMCW and SCSW in and out of local variables to 1380 * avoid taking the address of members of a packed struct. 1381 */ 1382 PMCW src_pmcw, dest_pmcw; 1383 SCSW src_scsw, dest_scsw; 1384 1385 src_pmcw = src->pmcw; 1386 copy_pmcw_from_guest(&dest_pmcw, &src_pmcw); 1387 dest->pmcw = dest_pmcw; 1388 src_scsw = src->scsw; 1389 copy_scsw_from_guest(&dest_scsw, &src_scsw); 1390 dest->scsw = dest_scsw; 1391 dest->mba = be64_to_cpu(src->mba); 1392 for (i = 0; i < ARRAY_SIZE(dest->mda); i++) { 1393 dest->mda[i] = src->mda[i]; 1394 } 1395 } 1396 1397 IOInstEnding css_do_msch(SubchDev *sch, const SCHIB *orig_schib) 1398 { 1399 SCHIB *schib = &sch->curr_status; 1400 uint16_t oldflags; 1401 SCHIB schib_copy; 1402 1403 if (!(schib->pmcw.flags & PMCW_FLAGS_MASK_DNV)) { 1404 return IOINST_CC_EXPECTED; 1405 } 1406 1407 if (schib->scsw.ctrl & SCSW_STCTL_STATUS_PEND) { 1408 return IOINST_CC_STATUS_PRESENT; 1409 } 1410 1411 if (schib->scsw.ctrl & 1412 (SCSW_FCTL_START_FUNC|SCSW_FCTL_HALT_FUNC|SCSW_FCTL_CLEAR_FUNC)) { 1413 return IOINST_CC_BUSY; 1414 } 1415 1416 copy_schib_from_guest(&schib_copy, orig_schib); 1417 /* Only update the program-modifiable fields. */ 1418 schib->pmcw.intparm = schib_copy.pmcw.intparm; 1419 oldflags = schib->pmcw.flags; 1420 schib->pmcw.flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA | 1421 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME | 1422 PMCW_FLAGS_MASK_MP); 1423 schib->pmcw.flags |= schib_copy.pmcw.flags & 1424 (PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA | 1425 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME | 1426 PMCW_FLAGS_MASK_MP); 1427 schib->pmcw.lpm = schib_copy.pmcw.lpm; 1428 schib->pmcw.mbi = schib_copy.pmcw.mbi; 1429 schib->pmcw.pom = schib_copy.pmcw.pom; 1430 schib->pmcw.chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE); 1431 schib->pmcw.chars |= schib_copy.pmcw.chars & 1432 (PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE); 1433 schib->mba = schib_copy.mba; 1434 1435 /* Has the channel been disabled? */ 1436 if (sch->disable_cb && (oldflags & PMCW_FLAGS_MASK_ENA) != 0 1437 && (schib->pmcw.flags & PMCW_FLAGS_MASK_ENA) == 0) { 1438 sch->disable_cb(sch); 1439 } 1440 return IOINST_CC_EXPECTED; 1441 } 1442 1443 IOInstEnding css_do_xsch(SubchDev *sch) 1444 { 1445 SCHIB *schib = &sch->curr_status; 1446 1447 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1448 return IOINST_CC_NOT_OPERATIONAL; 1449 } 1450 1451 if (schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL) { 1452 return IOINST_CC_STATUS_PRESENT; 1453 } 1454 1455 if (!(schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL) || 1456 ((schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) || 1457 (!(schib->scsw.ctrl & 1458 (SCSW_ACTL_RESUME_PEND | SCSW_ACTL_START_PEND | SCSW_ACTL_SUSP))) || 1459 (schib->scsw.ctrl & SCSW_ACTL_SUBCH_ACTIVE)) { 1460 return IOINST_CC_BUSY; 1461 } 1462 1463 /* Cancel the current operation. */ 1464 schib->scsw.ctrl &= ~(SCSW_FCTL_START_FUNC | 1465 SCSW_ACTL_RESUME_PEND | 1466 SCSW_ACTL_START_PEND | 1467 SCSW_ACTL_SUSP); 1468 sch->channel_prog = 0x0; 1469 sch->last_cmd_valid = false; 1470 schib->scsw.dstat = 0; 1471 schib->scsw.cstat = 0; 1472 return IOINST_CC_EXPECTED; 1473 } 1474 1475 IOInstEnding css_do_csch(SubchDev *sch) 1476 { 1477 SCHIB *schib = &sch->curr_status; 1478 1479 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1480 return IOINST_CC_NOT_OPERATIONAL; 1481 } 1482 1483 /* Trigger the clear function. */ 1484 schib->scsw.ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL); 1485 schib->scsw.ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_ACTL_CLEAR_PEND; 1486 1487 return do_subchannel_work(sch); 1488 } 1489 1490 IOInstEnding css_do_hsch(SubchDev *sch) 1491 { 1492 SCHIB *schib = &sch->curr_status; 1493 1494 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1495 return IOINST_CC_NOT_OPERATIONAL; 1496 } 1497 1498 if (((schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL) == SCSW_STCTL_STATUS_PEND) || 1499 (schib->scsw.ctrl & (SCSW_STCTL_PRIMARY | 1500 SCSW_STCTL_SECONDARY | 1501 SCSW_STCTL_ALERT))) { 1502 return IOINST_CC_STATUS_PRESENT; 1503 } 1504 1505 if (schib->scsw.ctrl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) { 1506 return IOINST_CC_BUSY; 1507 } 1508 1509 /* Trigger the halt function. */ 1510 schib->scsw.ctrl |= SCSW_FCTL_HALT_FUNC; 1511 schib->scsw.ctrl &= ~SCSW_FCTL_START_FUNC; 1512 if (((schib->scsw.ctrl & SCSW_CTRL_MASK_ACTL) == 1513 (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) && 1514 ((schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL) == 1515 SCSW_STCTL_INTERMEDIATE)) { 1516 schib->scsw.ctrl &= ~SCSW_STCTL_STATUS_PEND; 1517 } 1518 schib->scsw.ctrl |= SCSW_ACTL_HALT_PEND; 1519 1520 return do_subchannel_work(sch); 1521 } 1522 1523 static void css_update_chnmon(SubchDev *sch) 1524 { 1525 if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_MME)) { 1526 /* Not active. */ 1527 return; 1528 } 1529 /* The counter is conveniently located at the beginning of the struct. */ 1530 if (sch->curr_status.pmcw.chars & PMCW_CHARS_MASK_MBFC) { 1531 /* Format 1, per-subchannel area. */ 1532 uint32_t count; 1533 1534 count = address_space_ldl(&address_space_memory, 1535 sch->curr_status.mba, 1536 MEMTXATTRS_UNSPECIFIED, 1537 NULL); 1538 count++; 1539 address_space_stl(&address_space_memory, sch->curr_status.mba, count, 1540 MEMTXATTRS_UNSPECIFIED, NULL); 1541 } else { 1542 /* Format 0, global area. */ 1543 uint32_t offset; 1544 uint16_t count; 1545 1546 offset = sch->curr_status.pmcw.mbi << 5; 1547 count = address_space_lduw(&address_space_memory, 1548 channel_subsys.chnmon_area + offset, 1549 MEMTXATTRS_UNSPECIFIED, 1550 NULL); 1551 count++; 1552 address_space_stw(&address_space_memory, 1553 channel_subsys.chnmon_area + offset, count, 1554 MEMTXATTRS_UNSPECIFIED, NULL); 1555 } 1556 } 1557 1558 IOInstEnding css_do_ssch(SubchDev *sch, ORB *orb) 1559 { 1560 SCHIB *schib = &sch->curr_status; 1561 1562 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1563 return IOINST_CC_NOT_OPERATIONAL; 1564 } 1565 1566 if (schib->scsw.ctrl & SCSW_STCTL_STATUS_PEND) { 1567 return IOINST_CC_STATUS_PRESENT; 1568 } 1569 1570 if (schib->scsw.ctrl & (SCSW_FCTL_START_FUNC | 1571 SCSW_FCTL_HALT_FUNC | 1572 SCSW_FCTL_CLEAR_FUNC)) { 1573 return IOINST_CC_BUSY; 1574 } 1575 1576 /* If monitoring is active, update counter. */ 1577 if (channel_subsys.chnmon_active) { 1578 css_update_chnmon(sch); 1579 } 1580 sch->orb = *orb; 1581 sch->channel_prog = orb->cpa; 1582 /* Trigger the start function. */ 1583 schib->scsw.ctrl |= (SCSW_FCTL_START_FUNC | SCSW_ACTL_START_PEND); 1584 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO; 1585 1586 return do_subchannel_work(sch); 1587 } 1588 1589 static void copy_irb_to_guest(IRB *dest, const IRB *src, const PMCW *pmcw, 1590 int *irb_len) 1591 { 1592 int i; 1593 uint16_t stctl = src->scsw.ctrl & SCSW_CTRL_MASK_STCTL; 1594 uint16_t actl = src->scsw.ctrl & SCSW_CTRL_MASK_ACTL; 1595 1596 copy_scsw_to_guest(&dest->scsw, &src->scsw); 1597 1598 for (i = 0; i < ARRAY_SIZE(dest->esw); i++) { 1599 dest->esw[i] = cpu_to_be32(src->esw[i]); 1600 } 1601 for (i = 0; i < ARRAY_SIZE(dest->ecw); i++) { 1602 dest->ecw[i] = cpu_to_be32(src->ecw[i]); 1603 } 1604 *irb_len = sizeof(*dest) - sizeof(dest->emw); 1605 1606 /* extended measurements enabled? */ 1607 if ((src->scsw.flags & SCSW_FLAGS_MASK_ESWF) || 1608 !(pmcw->flags & PMCW_FLAGS_MASK_TF) || 1609 !(pmcw->chars & PMCW_CHARS_MASK_XMWME)) { 1610 return; 1611 } 1612 /* extended measurements pending? */ 1613 if (!(stctl & SCSW_STCTL_STATUS_PEND)) { 1614 return; 1615 } 1616 if ((stctl & SCSW_STCTL_PRIMARY) || 1617 (stctl == SCSW_STCTL_SECONDARY) || 1618 ((stctl & SCSW_STCTL_INTERMEDIATE) && (actl & SCSW_ACTL_SUSP))) { 1619 for (i = 0; i < ARRAY_SIZE(dest->emw); i++) { 1620 dest->emw[i] = cpu_to_be32(src->emw[i]); 1621 } 1622 } 1623 *irb_len = sizeof(*dest); 1624 } 1625 1626 int css_do_tsch_get_irb(SubchDev *sch, IRB *target_irb, int *irb_len) 1627 { 1628 SCHIB *schib = &sch->curr_status; 1629 PMCW p; 1630 uint16_t stctl; 1631 IRB irb; 1632 1633 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1634 return 3; 1635 } 1636 1637 stctl = schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL; 1638 1639 /* Prepare the irb for the guest. */ 1640 memset(&irb, 0, sizeof(IRB)); 1641 1642 /* Copy scsw from current status. */ 1643 irb.scsw = schib->scsw; 1644 if (stctl & SCSW_STCTL_STATUS_PEND) { 1645 if (schib->scsw.cstat & (SCSW_CSTAT_DATA_CHECK | 1646 SCSW_CSTAT_CHN_CTRL_CHK | 1647 SCSW_CSTAT_INTF_CTRL_CHK)) { 1648 irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF; 1649 irb.esw[0] = 0x04804000; 1650 } else { 1651 irb.esw[0] = 0x00800000; 1652 } 1653 /* If a unit check is pending, copy sense data. */ 1654 if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) && 1655 (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) { 1656 int i; 1657 1658 irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF | SCSW_FLAGS_MASK_ECTL; 1659 /* Attention: sense_data is already BE! */ 1660 memcpy(irb.ecw, sch->sense_data, sizeof(sch->sense_data)); 1661 for (i = 0; i < ARRAY_SIZE(irb.ecw); i++) { 1662 irb.ecw[i] = be32_to_cpu(irb.ecw[i]); 1663 } 1664 irb.esw[1] = 0x01000000 | (sizeof(sch->sense_data) << 8); 1665 } 1666 } 1667 /* Store the irb to the guest. */ 1668 p = schib->pmcw; 1669 copy_irb_to_guest(target_irb, &irb, &p, irb_len); 1670 1671 return ((stctl & SCSW_STCTL_STATUS_PEND) == 0); 1672 } 1673 1674 void css_do_tsch_update_subch(SubchDev *sch) 1675 { 1676 SCHIB *schib = &sch->curr_status; 1677 uint16_t stctl; 1678 uint16_t fctl; 1679 uint16_t actl; 1680 1681 stctl = schib->scsw.ctrl & SCSW_CTRL_MASK_STCTL; 1682 fctl = schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL; 1683 actl = schib->scsw.ctrl & SCSW_CTRL_MASK_ACTL; 1684 1685 /* Clear conditions on subchannel, if applicable. */ 1686 if (stctl & SCSW_STCTL_STATUS_PEND) { 1687 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 1688 if ((stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) || 1689 ((fctl & SCSW_FCTL_HALT_FUNC) && 1690 (actl & SCSW_ACTL_SUSP))) { 1691 schib->scsw.ctrl &= ~SCSW_CTRL_MASK_FCTL; 1692 } 1693 if (stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) { 1694 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO; 1695 schib->scsw.ctrl &= ~(SCSW_ACTL_RESUME_PEND | 1696 SCSW_ACTL_START_PEND | 1697 SCSW_ACTL_HALT_PEND | 1698 SCSW_ACTL_CLEAR_PEND | 1699 SCSW_ACTL_SUSP); 1700 } else { 1701 if ((actl & SCSW_ACTL_SUSP) && 1702 (fctl & SCSW_FCTL_START_FUNC)) { 1703 schib->scsw.flags &= ~SCSW_FLAGS_MASK_PNO; 1704 if (fctl & SCSW_FCTL_HALT_FUNC) { 1705 schib->scsw.ctrl &= ~(SCSW_ACTL_RESUME_PEND | 1706 SCSW_ACTL_START_PEND | 1707 SCSW_ACTL_HALT_PEND | 1708 SCSW_ACTL_CLEAR_PEND | 1709 SCSW_ACTL_SUSP); 1710 } else { 1711 schib->scsw.ctrl &= ~SCSW_ACTL_RESUME_PEND; 1712 } 1713 } 1714 } 1715 /* Clear pending sense data. */ 1716 if (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE) { 1717 memset(sch->sense_data, 0 , sizeof(sch->sense_data)); 1718 } 1719 } 1720 } 1721 1722 static void copy_crw_to_guest(CRW *dest, const CRW *src) 1723 { 1724 dest->flags = cpu_to_be16(src->flags); 1725 dest->rsid = cpu_to_be16(src->rsid); 1726 } 1727 1728 int css_do_stcrw(CRW *crw) 1729 { 1730 CrwContainer *crw_cont; 1731 int ret; 1732 1733 crw_cont = QTAILQ_FIRST(&channel_subsys.pending_crws); 1734 if (crw_cont) { 1735 QTAILQ_REMOVE(&channel_subsys.pending_crws, crw_cont, sibling); 1736 copy_crw_to_guest(crw, &crw_cont->crw); 1737 g_free(crw_cont); 1738 ret = 0; 1739 } else { 1740 /* List was empty, turn crw machine checks on again. */ 1741 memset(crw, 0, sizeof(*crw)); 1742 channel_subsys.do_crw_mchk = true; 1743 ret = 1; 1744 } 1745 1746 return ret; 1747 } 1748 1749 static void copy_crw_from_guest(CRW *dest, const CRW *src) 1750 { 1751 dest->flags = be16_to_cpu(src->flags); 1752 dest->rsid = be16_to_cpu(src->rsid); 1753 } 1754 1755 void css_undo_stcrw(CRW *crw) 1756 { 1757 CrwContainer *crw_cont; 1758 1759 crw_cont = g_try_new0(CrwContainer, 1); 1760 if (!crw_cont) { 1761 channel_subsys.crws_lost = true; 1762 return; 1763 } 1764 copy_crw_from_guest(&crw_cont->crw, crw); 1765 1766 QTAILQ_INSERT_HEAD(&channel_subsys.pending_crws, crw_cont, sibling); 1767 } 1768 1769 int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid, 1770 int rfmt, void *buf) 1771 { 1772 int i, desc_size; 1773 uint32_t words[8]; 1774 uint32_t chpid_type_word; 1775 CssImage *css; 1776 1777 if (!m && !cssid) { 1778 css = channel_subsys.css[channel_subsys.default_cssid]; 1779 } else { 1780 css = channel_subsys.css[cssid]; 1781 } 1782 if (!css) { 1783 return 0; 1784 } 1785 desc_size = 0; 1786 for (i = f_chpid; i <= l_chpid; i++) { 1787 if (css->chpids[i].in_use) { 1788 chpid_type_word = 0x80000000 | (css->chpids[i].type << 8) | i; 1789 if (rfmt == 0) { 1790 words[0] = cpu_to_be32(chpid_type_word); 1791 words[1] = 0; 1792 memcpy(buf + desc_size, words, 8); 1793 desc_size += 8; 1794 } else if (rfmt == 1) { 1795 words[0] = cpu_to_be32(chpid_type_word); 1796 words[1] = 0; 1797 words[2] = 0; 1798 words[3] = 0; 1799 words[4] = 0; 1800 words[5] = 0; 1801 words[6] = 0; 1802 words[7] = 0; 1803 memcpy(buf + desc_size, words, 32); 1804 desc_size += 32; 1805 } 1806 } 1807 } 1808 return desc_size; 1809 } 1810 1811 void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo) 1812 { 1813 /* dct is currently ignored (not really meaningful for our devices) */ 1814 /* TODO: Don't ignore mbk. */ 1815 if (update && !channel_subsys.chnmon_active) { 1816 /* Enable measuring. */ 1817 channel_subsys.chnmon_area = mbo; 1818 channel_subsys.chnmon_active = true; 1819 } 1820 if (!update && channel_subsys.chnmon_active) { 1821 /* Disable measuring. */ 1822 channel_subsys.chnmon_area = 0; 1823 channel_subsys.chnmon_active = false; 1824 } 1825 } 1826 1827 IOInstEnding css_do_rsch(SubchDev *sch) 1828 { 1829 SCHIB *schib = &sch->curr_status; 1830 1831 if (~(schib->pmcw.flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1832 return IOINST_CC_NOT_OPERATIONAL; 1833 } 1834 1835 if (schib->scsw.ctrl & SCSW_STCTL_STATUS_PEND) { 1836 return IOINST_CC_STATUS_PRESENT; 1837 } 1838 1839 if (((schib->scsw.ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) || 1840 (schib->scsw.ctrl & SCSW_ACTL_RESUME_PEND) || 1841 (!(schib->scsw.ctrl & SCSW_ACTL_SUSP))) { 1842 return IOINST_CC_BUSY; 1843 } 1844 1845 /* If monitoring is active, update counter. */ 1846 if (channel_subsys.chnmon_active) { 1847 css_update_chnmon(sch); 1848 } 1849 1850 schib->scsw.ctrl |= SCSW_ACTL_RESUME_PEND; 1851 return do_subchannel_work(sch); 1852 } 1853 1854 int css_do_rchp(uint8_t cssid, uint8_t chpid) 1855 { 1856 uint8_t real_cssid; 1857 1858 if (cssid > channel_subsys.max_cssid) { 1859 return -EINVAL; 1860 } 1861 if (channel_subsys.max_cssid == 0) { 1862 real_cssid = channel_subsys.default_cssid; 1863 } else { 1864 real_cssid = cssid; 1865 } 1866 if (!channel_subsys.css[real_cssid]) { 1867 return -EINVAL; 1868 } 1869 1870 if (!channel_subsys.css[real_cssid]->chpids[chpid].in_use) { 1871 return -ENODEV; 1872 } 1873 1874 if (!channel_subsys.css[real_cssid]->chpids[chpid].is_virtual) { 1875 fprintf(stderr, 1876 "rchp unsupported for non-virtual chpid %x.%02x!\n", 1877 real_cssid, chpid); 1878 return -ENODEV; 1879 } 1880 1881 /* We don't really use a channel path, so we're done here. */ 1882 css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 1, 1883 channel_subsys.max_cssid > 0 ? 1 : 0, chpid); 1884 if (channel_subsys.max_cssid > 0) { 1885 css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 1, 0, real_cssid << 8); 1886 } 1887 return 0; 1888 } 1889 1890 bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid) 1891 { 1892 SubchSet *set; 1893 uint8_t real_cssid; 1894 1895 real_cssid = (!m && (cssid == 0)) ? channel_subsys.default_cssid : cssid; 1896 if (ssid > MAX_SSID || 1897 !channel_subsys.css[real_cssid] || 1898 !channel_subsys.css[real_cssid]->sch_set[ssid]) { 1899 return true; 1900 } 1901 set = channel_subsys.css[real_cssid]->sch_set[ssid]; 1902 return schid > find_last_bit(set->schids_used, 1903 (MAX_SCHID + 1) / sizeof(unsigned long)); 1904 } 1905 1906 unsigned int css_find_free_chpid(uint8_t cssid) 1907 { 1908 CssImage *css = channel_subsys.css[cssid]; 1909 unsigned int chpid; 1910 1911 if (!css) { 1912 return MAX_CHPID + 1; 1913 } 1914 1915 for (chpid = 0; chpid <= MAX_CHPID; chpid++) { 1916 /* skip reserved chpid */ 1917 if (chpid == VIRTIO_CCW_CHPID) { 1918 continue; 1919 } 1920 if (!css->chpids[chpid].in_use) { 1921 return chpid; 1922 } 1923 } 1924 return MAX_CHPID + 1; 1925 } 1926 1927 static int css_add_chpid(uint8_t cssid, uint8_t chpid, uint8_t type, 1928 bool is_virt) 1929 { 1930 CssImage *css; 1931 1932 trace_css_chpid_add(cssid, chpid, type); 1933 css = channel_subsys.css[cssid]; 1934 if (!css) { 1935 return -EINVAL; 1936 } 1937 if (css->chpids[chpid].in_use) { 1938 return -EEXIST; 1939 } 1940 css->chpids[chpid].in_use = 1; 1941 css->chpids[chpid].type = type; 1942 css->chpids[chpid].is_virtual = is_virt; 1943 1944 css_generate_chp_crws(cssid, chpid); 1945 1946 return 0; 1947 } 1948 1949 void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type) 1950 { 1951 SCHIB *schib = &sch->curr_status; 1952 int i; 1953 CssImage *css = channel_subsys.css[sch->cssid]; 1954 1955 assert(css != NULL); 1956 memset(&schib->pmcw, 0, sizeof(PMCW)); 1957 schib->pmcw.flags |= PMCW_FLAGS_MASK_DNV; 1958 schib->pmcw.devno = sch->devno; 1959 /* single path */ 1960 schib->pmcw.pim = 0x80; 1961 schib->pmcw.pom = 0xff; 1962 schib->pmcw.pam = 0x80; 1963 schib->pmcw.chpid[0] = chpid; 1964 if (!css->chpids[chpid].in_use) { 1965 css_add_chpid(sch->cssid, chpid, type, true); 1966 } 1967 1968 memset(&schib->scsw, 0, sizeof(SCSW)); 1969 schib->mba = 0; 1970 for (i = 0; i < ARRAY_SIZE(schib->mda); i++) { 1971 schib->mda[i] = 0; 1972 } 1973 } 1974 1975 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid, uint16_t schid) 1976 { 1977 uint8_t real_cssid; 1978 1979 real_cssid = (!m && (cssid == 0)) ? channel_subsys.default_cssid : cssid; 1980 1981 if (!channel_subsys.css[real_cssid]) { 1982 return NULL; 1983 } 1984 1985 if (!channel_subsys.css[real_cssid]->sch_set[ssid]) { 1986 return NULL; 1987 } 1988 1989 return channel_subsys.css[real_cssid]->sch_set[ssid]->sch[schid]; 1990 } 1991 1992 /** 1993 * Return free device number in subchannel set. 1994 * 1995 * Return index of the first free device number in the subchannel set 1996 * identified by @p cssid and @p ssid, beginning the search at @p 1997 * start and wrapping around at MAX_DEVNO. Return a value exceeding 1998 * MAX_SCHID if there are no free device numbers in the subchannel 1999 * set. 2000 */ 2001 static uint32_t css_find_free_devno(uint8_t cssid, uint8_t ssid, 2002 uint16_t start) 2003 { 2004 uint32_t round; 2005 2006 for (round = 0; round <= MAX_DEVNO; round++) { 2007 uint16_t devno = (start + round) % MAX_DEVNO; 2008 2009 if (!css_devno_used(cssid, ssid, devno)) { 2010 return devno; 2011 } 2012 } 2013 return MAX_DEVNO + 1; 2014 } 2015 2016 /** 2017 * Return first free subchannel (id) in subchannel set. 2018 * 2019 * Return index of the first free subchannel in the subchannel set 2020 * identified by @p cssid and @p ssid, if there is any. Return a value 2021 * exceeding MAX_SCHID if there are no free subchannels in the 2022 * subchannel set. 2023 */ 2024 static uint32_t css_find_free_subch(uint8_t cssid, uint8_t ssid) 2025 { 2026 uint32_t schid; 2027 2028 for (schid = 0; schid <= MAX_SCHID; schid++) { 2029 if (!css_find_subch(1, cssid, ssid, schid)) { 2030 return schid; 2031 } 2032 } 2033 return MAX_SCHID + 1; 2034 } 2035 2036 /** 2037 * Return first free subchannel (id) in subchannel set for a device number 2038 * 2039 * Verify the device number @p devno is not used yet in the subchannel 2040 * set identified by @p cssid and @p ssid. Set @p schid to the index 2041 * of the first free subchannel in the subchannel set, if there is 2042 * any. Return true if everything succeeded and false otherwise. 2043 */ 2044 static bool css_find_free_subch_for_devno(uint8_t cssid, uint8_t ssid, 2045 uint16_t devno, uint16_t *schid, 2046 Error **errp) 2047 { 2048 uint32_t free_schid; 2049 2050 assert(schid); 2051 if (css_devno_used(cssid, ssid, devno)) { 2052 error_setg(errp, "Device %x.%x.%04x already exists", 2053 cssid, ssid, devno); 2054 return false; 2055 } 2056 free_schid = css_find_free_subch(cssid, ssid); 2057 if (free_schid > MAX_SCHID) { 2058 error_setg(errp, "No free subchannel found for %x.%x.%04x", 2059 cssid, ssid, devno); 2060 return false; 2061 } 2062 *schid = free_schid; 2063 return true; 2064 } 2065 2066 /** 2067 * Return first free subchannel (id) and device number 2068 * 2069 * Locate the first free subchannel and first free device number in 2070 * any of the subchannel sets of the channel subsystem identified by 2071 * @p cssid. Return false if no free subchannel / device number could 2072 * be found. Otherwise set @p ssid, @p devno and @p schid to identify 2073 * the available subchannel and device number and return true. 2074 * 2075 * May modify @p ssid, @p devno and / or @p schid even if no free 2076 * subchannel / device number could be found. 2077 */ 2078 static bool css_find_free_subch_and_devno(uint8_t cssid, uint8_t *ssid, 2079 uint16_t *devno, uint16_t *schid, 2080 Error **errp) 2081 { 2082 uint32_t free_schid, free_devno; 2083 2084 assert(ssid && devno && schid); 2085 for (*ssid = 0; *ssid <= MAX_SSID; (*ssid)++) { 2086 free_schid = css_find_free_subch(cssid, *ssid); 2087 if (free_schid > MAX_SCHID) { 2088 continue; 2089 } 2090 free_devno = css_find_free_devno(cssid, *ssid, free_schid); 2091 if (free_devno > MAX_DEVNO) { 2092 continue; 2093 } 2094 *schid = free_schid; 2095 *devno = free_devno; 2096 return true; 2097 } 2098 error_setg(errp, "Virtual channel subsystem is full!"); 2099 return false; 2100 } 2101 2102 bool css_subch_visible(SubchDev *sch) 2103 { 2104 if (sch->ssid > channel_subsys.max_ssid) { 2105 return false; 2106 } 2107 2108 if (sch->cssid != channel_subsys.default_cssid) { 2109 return (channel_subsys.max_cssid > 0); 2110 } 2111 2112 return true; 2113 } 2114 2115 bool css_present(uint8_t cssid) 2116 { 2117 return (channel_subsys.css[cssid] != NULL); 2118 } 2119 2120 bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno) 2121 { 2122 if (!channel_subsys.css[cssid]) { 2123 return false; 2124 } 2125 if (!channel_subsys.css[cssid]->sch_set[ssid]) { 2126 return false; 2127 } 2128 2129 return !!test_bit(devno, 2130 channel_subsys.css[cssid]->sch_set[ssid]->devnos_used); 2131 } 2132 2133 void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid, 2134 uint16_t devno, SubchDev *sch) 2135 { 2136 CssImage *css; 2137 SubchSet *s_set; 2138 2139 trace_css_assign_subch(sch ? "assign" : "deassign", cssid, ssid, schid, 2140 devno); 2141 if (!channel_subsys.css[cssid]) { 2142 fprintf(stderr, 2143 "Suspicious call to %s (%x.%x.%04x) for non-existing css!\n", 2144 __func__, cssid, ssid, schid); 2145 return; 2146 } 2147 css = channel_subsys.css[cssid]; 2148 2149 if (!css->sch_set[ssid]) { 2150 css->sch_set[ssid] = g_new0(SubchSet, 1); 2151 } 2152 s_set = css->sch_set[ssid]; 2153 2154 s_set->sch[schid] = sch; 2155 if (sch) { 2156 set_bit(schid, s_set->schids_used); 2157 set_bit(devno, s_set->devnos_used); 2158 } else { 2159 clear_bit(schid, s_set->schids_used); 2160 clear_bit(devno, s_set->devnos_used); 2161 } 2162 } 2163 2164 void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited, 2165 int chain, uint16_t rsid) 2166 { 2167 CrwContainer *crw_cont; 2168 2169 trace_css_crw(rsc, erc, rsid, chain ? "(chained)" : ""); 2170 /* TODO: Maybe use a static crw pool? */ 2171 crw_cont = g_try_new0(CrwContainer, 1); 2172 if (!crw_cont) { 2173 channel_subsys.crws_lost = true; 2174 return; 2175 } 2176 crw_cont->crw.flags = (rsc << 8) | erc; 2177 if (solicited) { 2178 crw_cont->crw.flags |= CRW_FLAGS_MASK_S; 2179 } 2180 if (chain) { 2181 crw_cont->crw.flags |= CRW_FLAGS_MASK_C; 2182 } 2183 crw_cont->crw.rsid = rsid; 2184 if (channel_subsys.crws_lost) { 2185 crw_cont->crw.flags |= CRW_FLAGS_MASK_R; 2186 channel_subsys.crws_lost = false; 2187 } 2188 2189 QTAILQ_INSERT_TAIL(&channel_subsys.pending_crws, crw_cont, sibling); 2190 2191 if (channel_subsys.do_crw_mchk) { 2192 channel_subsys.do_crw_mchk = false; 2193 /* Inject crw pending machine check. */ 2194 s390_crw_mchk(); 2195 } 2196 } 2197 2198 void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid, 2199 int hotplugged, int add) 2200 { 2201 uint8_t guest_cssid; 2202 bool chain_crw; 2203 2204 if (add && !hotplugged) { 2205 return; 2206 } 2207 if (channel_subsys.max_cssid == 0) { 2208 /* Default cssid shows up as 0. */ 2209 guest_cssid = (cssid == channel_subsys.default_cssid) ? 0 : cssid; 2210 } else { 2211 /* Show real cssid to the guest. */ 2212 guest_cssid = cssid; 2213 } 2214 /* 2215 * Only notify for higher subchannel sets/channel subsystems if the 2216 * guest has enabled it. 2217 */ 2218 if ((ssid > channel_subsys.max_ssid) || 2219 (guest_cssid > channel_subsys.max_cssid) || 2220 ((channel_subsys.max_cssid == 0) && 2221 (cssid != channel_subsys.default_cssid))) { 2222 return; 2223 } 2224 chain_crw = (channel_subsys.max_ssid > 0) || 2225 (channel_subsys.max_cssid > 0); 2226 css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, 0, chain_crw ? 1 : 0, schid); 2227 if (chain_crw) { 2228 css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, 0, 0, 2229 (guest_cssid << 8) | (ssid << 4)); 2230 } 2231 /* RW_ERC_IPI --> clear pending interrupts */ 2232 css_clear_io_interrupt(css_do_build_subchannel_id(cssid, ssid), schid); 2233 } 2234 2235 void css_generate_chp_crws(uint8_t cssid, uint8_t chpid) 2236 { 2237 /* TODO */ 2238 } 2239 2240 void css_generate_css_crws(uint8_t cssid) 2241 { 2242 if (!channel_subsys.sei_pending) { 2243 css_queue_crw(CRW_RSC_CSS, CRW_ERC_EVENT, 0, 0, cssid); 2244 } 2245 channel_subsys.sei_pending = true; 2246 } 2247 2248 void css_clear_sei_pending(void) 2249 { 2250 channel_subsys.sei_pending = false; 2251 } 2252 2253 int css_enable_mcsse(void) 2254 { 2255 trace_css_enable_facility("mcsse"); 2256 channel_subsys.max_cssid = MAX_CSSID; 2257 return 0; 2258 } 2259 2260 int css_enable_mss(void) 2261 { 2262 trace_css_enable_facility("mss"); 2263 channel_subsys.max_ssid = MAX_SSID; 2264 return 0; 2265 } 2266 2267 void css_reset_sch(SubchDev *sch) 2268 { 2269 SCHIB *schib = &sch->curr_status; 2270 2271 if ((schib->pmcw.flags & PMCW_FLAGS_MASK_ENA) != 0 && sch->disable_cb) { 2272 sch->disable_cb(sch); 2273 } 2274 2275 schib->pmcw.intparm = 0; 2276 schib->pmcw.flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA | 2277 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME | 2278 PMCW_FLAGS_MASK_MP | PMCW_FLAGS_MASK_TF); 2279 schib->pmcw.flags |= PMCW_FLAGS_MASK_DNV; 2280 schib->pmcw.devno = sch->devno; 2281 schib->pmcw.pim = 0x80; 2282 schib->pmcw.lpm = schib->pmcw.pim; 2283 schib->pmcw.pnom = 0; 2284 schib->pmcw.lpum = 0; 2285 schib->pmcw.mbi = 0; 2286 schib->pmcw.pom = 0xff; 2287 schib->pmcw.pam = 0x80; 2288 schib->pmcw.chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_XMWME | 2289 PMCW_CHARS_MASK_CSENSE); 2290 2291 memset(&schib->scsw, 0, sizeof(schib->scsw)); 2292 schib->mba = 0; 2293 2294 sch->channel_prog = 0x0; 2295 sch->last_cmd_valid = false; 2296 sch->thinint_active = false; 2297 } 2298 2299 void css_reset(void) 2300 { 2301 CrwContainer *crw_cont; 2302 2303 /* Clean up monitoring. */ 2304 channel_subsys.chnmon_active = false; 2305 channel_subsys.chnmon_area = 0; 2306 2307 /* Clear pending CRWs. */ 2308 while ((crw_cont = QTAILQ_FIRST(&channel_subsys.pending_crws))) { 2309 QTAILQ_REMOVE(&channel_subsys.pending_crws, crw_cont, sibling); 2310 g_free(crw_cont); 2311 } 2312 channel_subsys.sei_pending = false; 2313 channel_subsys.do_crw_mchk = true; 2314 channel_subsys.crws_lost = false; 2315 2316 /* Reset maximum ids. */ 2317 channel_subsys.max_cssid = 0; 2318 channel_subsys.max_ssid = 0; 2319 } 2320 2321 static void get_css_devid(Object *obj, Visitor *v, const char *name, 2322 void *opaque, Error **errp) 2323 { 2324 DeviceState *dev = DEVICE(obj); 2325 Property *prop = opaque; 2326 CssDevId *dev_id = qdev_get_prop_ptr(dev, prop); 2327 char buffer[] = "xx.x.xxxx"; 2328 char *p = buffer; 2329 int r; 2330 2331 if (dev_id->valid) { 2332 2333 r = snprintf(buffer, sizeof(buffer), "%02x.%1x.%04x", dev_id->cssid, 2334 dev_id->ssid, dev_id->devid); 2335 assert(r == sizeof(buffer) - 1); 2336 2337 /* drop leading zero */ 2338 if (dev_id->cssid <= 0xf) { 2339 p++; 2340 } 2341 } else { 2342 snprintf(buffer, sizeof(buffer), "<unset>"); 2343 } 2344 2345 visit_type_str(v, name, &p, errp); 2346 } 2347 2348 /* 2349 * parse <cssid>.<ssid>.<devid> and assert valid range for cssid/ssid 2350 */ 2351 static void set_css_devid(Object *obj, Visitor *v, const char *name, 2352 void *opaque, Error **errp) 2353 { 2354 DeviceState *dev = DEVICE(obj); 2355 Property *prop = opaque; 2356 CssDevId *dev_id = qdev_get_prop_ptr(dev, prop); 2357 Error *local_err = NULL; 2358 char *str; 2359 int num, n1, n2; 2360 unsigned int cssid, ssid, devid; 2361 2362 if (dev->realized) { 2363 qdev_prop_set_after_realize(dev, name, errp); 2364 return; 2365 } 2366 2367 visit_type_str(v, name, &str, &local_err); 2368 if (local_err) { 2369 error_propagate(errp, local_err); 2370 return; 2371 } 2372 2373 num = sscanf(str, "%2x.%1x%n.%4x%n", &cssid, &ssid, &n1, &devid, &n2); 2374 if (num != 3 || (n2 - n1) != 5 || strlen(str) != n2) { 2375 error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str); 2376 goto out; 2377 } 2378 if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) { 2379 error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x", 2380 cssid, ssid); 2381 goto out; 2382 } 2383 2384 dev_id->cssid = cssid; 2385 dev_id->ssid = ssid; 2386 dev_id->devid = devid; 2387 dev_id->valid = true; 2388 2389 out: 2390 g_free(str); 2391 } 2392 2393 const PropertyInfo css_devid_propinfo = { 2394 .name = "str", 2395 .description = "Identifier of an I/O device in the channel " 2396 "subsystem, example: fe.1.23ab", 2397 .get = get_css_devid, 2398 .set = set_css_devid, 2399 }; 2400 2401 const PropertyInfo css_devid_ro_propinfo = { 2402 .name = "str", 2403 .description = "Read-only identifier of an I/O device in the channel " 2404 "subsystem, example: fe.1.23ab", 2405 .get = get_css_devid, 2406 }; 2407 2408 SubchDev *css_create_sch(CssDevId bus_id, Error **errp) 2409 { 2410 uint16_t schid = 0; 2411 SubchDev *sch; 2412 2413 if (bus_id.valid) { 2414 if (!channel_subsys.css[bus_id.cssid]) { 2415 css_create_css_image(bus_id.cssid, false); 2416 } 2417 2418 if (!css_find_free_subch_for_devno(bus_id.cssid, bus_id.ssid, 2419 bus_id.devid, &schid, errp)) { 2420 return NULL; 2421 } 2422 } else { 2423 for (bus_id.cssid = channel_subsys.default_cssid;;) { 2424 if (!channel_subsys.css[bus_id.cssid]) { 2425 css_create_css_image(bus_id.cssid, false); 2426 } 2427 2428 if (css_find_free_subch_and_devno(bus_id.cssid, &bus_id.ssid, 2429 &bus_id.devid, &schid, 2430 NULL)) { 2431 break; 2432 } 2433 bus_id.cssid = (bus_id.cssid + 1) % MAX_CSSID; 2434 if (bus_id.cssid == channel_subsys.default_cssid) { 2435 error_setg(errp, "Virtual channel subsystem is full!"); 2436 return NULL; 2437 } 2438 } 2439 } 2440 2441 sch = g_new0(SubchDev, 1); 2442 sch->cssid = bus_id.cssid; 2443 sch->ssid = bus_id.ssid; 2444 sch->devno = bus_id.devid; 2445 sch->schid = schid; 2446 css_subch_assign(sch->cssid, sch->ssid, schid, sch->devno, sch); 2447 return sch; 2448 } 2449 2450 static int css_sch_get_chpids(SubchDev *sch, CssDevId *dev_id) 2451 { 2452 char *fid_path; 2453 FILE *fd; 2454 uint32_t chpid[8]; 2455 int i; 2456 SCHIB *schib = &sch->curr_status; 2457 2458 fid_path = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/chpids", 2459 dev_id->cssid, dev_id->ssid, dev_id->devid); 2460 fd = fopen(fid_path, "r"); 2461 if (fd == NULL) { 2462 error_report("%s: open %s failed", __func__, fid_path); 2463 g_free(fid_path); 2464 return -EINVAL; 2465 } 2466 2467 if (fscanf(fd, "%x %x %x %x %x %x %x %x", 2468 &chpid[0], &chpid[1], &chpid[2], &chpid[3], 2469 &chpid[4], &chpid[5], &chpid[6], &chpid[7]) != 8) { 2470 fclose(fd); 2471 g_free(fid_path); 2472 return -EINVAL; 2473 } 2474 2475 for (i = 0; i < ARRAY_SIZE(schib->pmcw.chpid); i++) { 2476 schib->pmcw.chpid[i] = chpid[i]; 2477 } 2478 2479 fclose(fd); 2480 g_free(fid_path); 2481 2482 return 0; 2483 } 2484 2485 static int css_sch_get_path_masks(SubchDev *sch, CssDevId *dev_id) 2486 { 2487 char *fid_path; 2488 FILE *fd; 2489 uint32_t pim, pam, pom; 2490 SCHIB *schib = &sch->curr_status; 2491 2492 fid_path = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/pimpampom", 2493 dev_id->cssid, dev_id->ssid, dev_id->devid); 2494 fd = fopen(fid_path, "r"); 2495 if (fd == NULL) { 2496 error_report("%s: open %s failed", __func__, fid_path); 2497 g_free(fid_path); 2498 return -EINVAL; 2499 } 2500 2501 if (fscanf(fd, "%x %x %x", &pim, &pam, &pom) != 3) { 2502 fclose(fd); 2503 g_free(fid_path); 2504 return -EINVAL; 2505 } 2506 2507 schib->pmcw.pim = pim; 2508 schib->pmcw.pam = pam; 2509 schib->pmcw.pom = pom; 2510 fclose(fd); 2511 g_free(fid_path); 2512 2513 return 0; 2514 } 2515 2516 static int css_sch_get_chpid_type(uint8_t chpid, uint32_t *type, 2517 CssDevId *dev_id) 2518 { 2519 char *fid_path; 2520 FILE *fd; 2521 2522 fid_path = g_strdup_printf("/sys/devices/css%x/chp0.%02x/type", 2523 dev_id->cssid, chpid); 2524 fd = fopen(fid_path, "r"); 2525 if (fd == NULL) { 2526 error_report("%s: open %s failed", __func__, fid_path); 2527 g_free(fid_path); 2528 return -EINVAL; 2529 } 2530 2531 if (fscanf(fd, "%x", type) != 1) { 2532 fclose(fd); 2533 g_free(fid_path); 2534 return -EINVAL; 2535 } 2536 2537 fclose(fd); 2538 g_free(fid_path); 2539 2540 return 0; 2541 } 2542 2543 /* 2544 * We currently retrieve the real device information from sysfs to build the 2545 * guest subchannel information block without considering the migration feature. 2546 * We need to revisit this problem when we want to add migration support. 2547 */ 2548 int css_sch_build_schib(SubchDev *sch, CssDevId *dev_id) 2549 { 2550 CssImage *css = channel_subsys.css[sch->cssid]; 2551 SCHIB *schib = &sch->curr_status; 2552 uint32_t type; 2553 int i, ret; 2554 2555 assert(css != NULL); 2556 memset(&schib->pmcw, 0, sizeof(PMCW)); 2557 schib->pmcw.flags |= PMCW_FLAGS_MASK_DNV; 2558 /* We are dealing with I/O subchannels only. */ 2559 schib->pmcw.devno = sch->devno; 2560 2561 /* Grab path mask from sysfs. */ 2562 ret = css_sch_get_path_masks(sch, dev_id); 2563 if (ret) { 2564 return ret; 2565 } 2566 2567 /* Grab chpids from sysfs. */ 2568 ret = css_sch_get_chpids(sch, dev_id); 2569 if (ret) { 2570 return ret; 2571 } 2572 2573 /* Build chpid type. */ 2574 for (i = 0; i < ARRAY_SIZE(schib->pmcw.chpid); i++) { 2575 if (schib->pmcw.chpid[i] && !css->chpids[schib->pmcw.chpid[i]].in_use) { 2576 ret = css_sch_get_chpid_type(schib->pmcw.chpid[i], &type, dev_id); 2577 if (ret) { 2578 return ret; 2579 } 2580 css_add_chpid(sch->cssid, schib->pmcw.chpid[i], type, false); 2581 } 2582 } 2583 2584 memset(&schib->scsw, 0, sizeof(SCSW)); 2585 schib->mba = 0; 2586 for (i = 0; i < ARRAY_SIZE(schib->mda); i++) { 2587 schib->mda[i] = 0; 2588 } 2589 2590 return 0; 2591 } 2592