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 "hw/qdev.h" 16 #include "qemu/error-report.h" 17 #include "qemu/bitops.h" 18 #include "qemu/error-report.h" 19 #include "exec/address-spaces.h" 20 #include "cpu.h" 21 #include "hw/s390x/ioinst.h" 22 #include "hw/s390x/css.h" 23 #include "trace.h" 24 #include "hw/s390x/s390_flic.h" 25 #include "hw/s390x/s390-virtio-ccw.h" 26 27 typedef struct CrwContainer { 28 CRW crw; 29 QTAILQ_ENTRY(CrwContainer) sibling; 30 } CrwContainer; 31 32 typedef struct ChpInfo { 33 uint8_t in_use; 34 uint8_t type; 35 uint8_t is_virtual; 36 } ChpInfo; 37 38 typedef struct SubchSet { 39 SubchDev *sch[MAX_SCHID + 1]; 40 unsigned long schids_used[BITS_TO_LONGS(MAX_SCHID + 1)]; 41 unsigned long devnos_used[BITS_TO_LONGS(MAX_SCHID + 1)]; 42 } SubchSet; 43 44 static const VMStateDescription vmstate_scsw = { 45 .name = "s390_scsw", 46 .version_id = 1, 47 .minimum_version_id = 1, 48 .fields = (VMStateField[]) { 49 VMSTATE_UINT16(flags, SCSW), 50 VMSTATE_UINT16(ctrl, SCSW), 51 VMSTATE_UINT32(cpa, SCSW), 52 VMSTATE_UINT8(dstat, SCSW), 53 VMSTATE_UINT8(cstat, SCSW), 54 VMSTATE_UINT16(count, SCSW), 55 VMSTATE_END_OF_LIST() 56 } 57 }; 58 59 static const VMStateDescription vmstate_pmcw = { 60 .name = "s390_pmcw", 61 .version_id = 1, 62 .minimum_version_id = 1, 63 .fields = (VMStateField[]) { 64 VMSTATE_UINT32(intparm, PMCW), 65 VMSTATE_UINT16(flags, PMCW), 66 VMSTATE_UINT16(devno, PMCW), 67 VMSTATE_UINT8(lpm, PMCW), 68 VMSTATE_UINT8(pnom, PMCW), 69 VMSTATE_UINT8(lpum, PMCW), 70 VMSTATE_UINT8(pim, PMCW), 71 VMSTATE_UINT16(mbi, PMCW), 72 VMSTATE_UINT8(pom, PMCW), 73 VMSTATE_UINT8(pam, PMCW), 74 VMSTATE_UINT8_ARRAY(chpid, PMCW, 8), 75 VMSTATE_UINT32(chars, PMCW), 76 VMSTATE_END_OF_LIST() 77 } 78 }; 79 80 static const VMStateDescription vmstate_schib = { 81 .name = "s390_schib", 82 .version_id = 1, 83 .minimum_version_id = 1, 84 .fields = (VMStateField[]) { 85 VMSTATE_STRUCT(pmcw, SCHIB, 0, vmstate_pmcw, PMCW), 86 VMSTATE_STRUCT(scsw, SCHIB, 0, vmstate_scsw, SCSW), 87 VMSTATE_UINT64(mba, SCHIB), 88 VMSTATE_UINT8_ARRAY(mda, SCHIB, 4), 89 VMSTATE_END_OF_LIST() 90 } 91 }; 92 93 94 static const VMStateDescription vmstate_ccw1 = { 95 .name = "s390_ccw1", 96 .version_id = 1, 97 .minimum_version_id = 1, 98 .fields = (VMStateField[]) { 99 VMSTATE_UINT8(cmd_code, CCW1), 100 VMSTATE_UINT8(flags, CCW1), 101 VMSTATE_UINT16(count, CCW1), 102 VMSTATE_UINT32(cda, CCW1), 103 VMSTATE_END_OF_LIST() 104 } 105 }; 106 107 static const VMStateDescription vmstate_ciw = { 108 .name = "s390_ciw", 109 .version_id = 1, 110 .minimum_version_id = 1, 111 .fields = (VMStateField[]) { 112 VMSTATE_UINT8(type, CIW), 113 VMSTATE_UINT8(command, CIW), 114 VMSTATE_UINT16(count, CIW), 115 VMSTATE_END_OF_LIST() 116 } 117 }; 118 119 static const VMStateDescription vmstate_sense_id = { 120 .name = "s390_sense_id", 121 .version_id = 1, 122 .minimum_version_id = 1, 123 .fields = (VMStateField[]) { 124 VMSTATE_UINT8(reserved, SenseId), 125 VMSTATE_UINT16(cu_type, SenseId), 126 VMSTATE_UINT8(cu_model, SenseId), 127 VMSTATE_UINT16(dev_type, SenseId), 128 VMSTATE_UINT8(dev_model, SenseId), 129 VMSTATE_UINT8(unused, SenseId), 130 VMSTATE_STRUCT_ARRAY(ciw, SenseId, MAX_CIWS, 0, vmstate_ciw, CIW), 131 VMSTATE_END_OF_LIST() 132 } 133 }; 134 135 static int subch_dev_post_load(void *opaque, int version_id); 136 static void subch_dev_pre_save(void *opaque); 137 138 const char err_hint_devno[] = "Devno mismatch, tried to load wrong section!" 139 " Likely reason: some sequences of plug and unplug can break" 140 " migration for machine versions prior to 2.7 (known design flaw)."; 141 142 const VMStateDescription vmstate_subch_dev = { 143 .name = "s390_subch_dev", 144 .version_id = 1, 145 .minimum_version_id = 1, 146 .post_load = subch_dev_post_load, 147 .pre_save = subch_dev_pre_save, 148 .fields = (VMStateField[]) { 149 VMSTATE_UINT8_EQUAL(cssid, SubchDev, "Bug!"), 150 VMSTATE_UINT8_EQUAL(ssid, SubchDev, "Bug!"), 151 VMSTATE_UINT16(migrated_schid, SubchDev), 152 VMSTATE_UINT16_EQUAL(devno, SubchDev, err_hint_devno), 153 VMSTATE_BOOL(thinint_active, SubchDev), 154 VMSTATE_STRUCT(curr_status, SubchDev, 0, vmstate_schib, SCHIB), 155 VMSTATE_UINT8_ARRAY(sense_data, SubchDev, 32), 156 VMSTATE_UINT64(channel_prog, SubchDev), 157 VMSTATE_STRUCT(last_cmd, SubchDev, 0, vmstate_ccw1, CCW1), 158 VMSTATE_BOOL(last_cmd_valid, SubchDev), 159 VMSTATE_STRUCT(id, SubchDev, 0, vmstate_sense_id, SenseId), 160 VMSTATE_BOOL(ccw_fmt_1, SubchDev), 161 VMSTATE_UINT8(ccw_no_data_cnt, SubchDev), 162 VMSTATE_END_OF_LIST() 163 } 164 }; 165 166 typedef struct IndAddrPtrTmp { 167 IndAddr **parent; 168 uint64_t addr; 169 int32_t len; 170 } IndAddrPtrTmp; 171 172 static int post_load_ind_addr(void *opaque, int version_id) 173 { 174 IndAddrPtrTmp *ptmp = opaque; 175 IndAddr **ind_addr = ptmp->parent; 176 177 if (ptmp->len != 0) { 178 *ind_addr = get_indicator(ptmp->addr, ptmp->len); 179 } else { 180 *ind_addr = NULL; 181 } 182 return 0; 183 } 184 185 static void pre_save_ind_addr(void *opaque) 186 { 187 IndAddrPtrTmp *ptmp = opaque; 188 IndAddr *ind_addr = *(ptmp->parent); 189 190 if (ind_addr != NULL) { 191 ptmp->len = ind_addr->len; 192 ptmp->addr = ind_addr->addr; 193 } else { 194 ptmp->len = 0; 195 ptmp->addr = 0L; 196 } 197 } 198 199 const VMStateDescription vmstate_ind_addr_tmp = { 200 .name = "s390_ind_addr_tmp", 201 .pre_save = pre_save_ind_addr, 202 .post_load = post_load_ind_addr, 203 204 .fields = (VMStateField[]) { 205 VMSTATE_INT32(len, IndAddrPtrTmp), 206 VMSTATE_UINT64(addr, IndAddrPtrTmp), 207 VMSTATE_END_OF_LIST() 208 } 209 }; 210 211 const VMStateDescription vmstate_ind_addr = { 212 .name = "s390_ind_addr_tmp", 213 .fields = (VMStateField[]) { 214 VMSTATE_WITH_TMP(IndAddr*, IndAddrPtrTmp, vmstate_ind_addr_tmp), 215 VMSTATE_END_OF_LIST() 216 } 217 }; 218 219 typedef struct CssImage { 220 SubchSet *sch_set[MAX_SSID + 1]; 221 ChpInfo chpids[MAX_CHPID + 1]; 222 } CssImage; 223 224 typedef struct IoAdapter { 225 uint32_t id; 226 uint8_t type; 227 uint8_t isc; 228 } IoAdapter; 229 230 typedef struct ChannelSubSys { 231 QTAILQ_HEAD(, CrwContainer) pending_crws; 232 bool sei_pending; 233 bool do_crw_mchk; 234 bool crws_lost; 235 uint8_t max_cssid; 236 uint8_t max_ssid; 237 bool chnmon_active; 238 uint64_t chnmon_area; 239 CssImage *css[MAX_CSSID + 1]; 240 uint8_t default_cssid; 241 IoAdapter *io_adapters[CSS_IO_ADAPTER_TYPE_NUMS][MAX_ISC + 1]; 242 QTAILQ_HEAD(, IndAddr) indicator_addresses; 243 } ChannelSubSys; 244 245 static ChannelSubSys channel_subsys = { 246 .pending_crws = QTAILQ_HEAD_INITIALIZER(channel_subsys.pending_crws), 247 .do_crw_mchk = true, 248 .sei_pending = false, 249 .do_crw_mchk = true, 250 .crws_lost = false, 251 .chnmon_active = false, 252 .indicator_addresses = 253 QTAILQ_HEAD_INITIALIZER(channel_subsys.indicator_addresses), 254 }; 255 256 static void subch_dev_pre_save(void *opaque) 257 { 258 SubchDev *s = opaque; 259 260 /* Prepare remote_schid for save */ 261 s->migrated_schid = s->schid; 262 } 263 264 static int subch_dev_post_load(void *opaque, int version_id) 265 { 266 267 SubchDev *s = opaque; 268 269 /* Re-assign the subchannel to remote_schid if necessary */ 270 if (s->migrated_schid != s->schid) { 271 if (css_find_subch(true, s->cssid, s->ssid, s->schid) == s) { 272 /* 273 * Cleanup the slot before moving to s->migrated_schid provided 274 * it still belongs to us, i.e. it was not changed by previous 275 * invocation of this function. 276 */ 277 css_subch_assign(s->cssid, s->ssid, s->schid, s->devno, NULL); 278 } 279 /* It's OK to re-assign without a prior de-assign. */ 280 s->schid = s->migrated_schid; 281 css_subch_assign(s->cssid, s->ssid, s->schid, s->devno, s); 282 } 283 284 /* 285 * Hack alert. If we don't migrate the channel subsystem status 286 * we still need to find out if the guest enabled mss/mcss-e. 287 * If the subchannel is enabled, it certainly was able to access it, 288 * so adjust the max_ssid/max_cssid values for relevant ssid/cssid 289 * values. This is not watertight, but better than nothing. 290 */ 291 if (s->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA) { 292 if (s->ssid) { 293 channel_subsys.max_ssid = MAX_SSID; 294 } 295 if (s->cssid != channel_subsys.default_cssid) { 296 channel_subsys.max_cssid = MAX_CSSID; 297 } 298 } 299 return 0; 300 } 301 302 IndAddr *get_indicator(hwaddr ind_addr, int len) 303 { 304 IndAddr *indicator; 305 306 QTAILQ_FOREACH(indicator, &channel_subsys.indicator_addresses, sibling) { 307 if (indicator->addr == ind_addr) { 308 indicator->refcnt++; 309 return indicator; 310 } 311 } 312 indicator = g_new0(IndAddr, 1); 313 indicator->addr = ind_addr; 314 indicator->len = len; 315 indicator->refcnt = 1; 316 QTAILQ_INSERT_TAIL(&channel_subsys.indicator_addresses, 317 indicator, sibling); 318 return indicator; 319 } 320 321 static int s390_io_adapter_map(AdapterInfo *adapter, uint64_t map_addr, 322 bool do_map) 323 { 324 S390FLICState *fs = s390_get_flic(); 325 S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs); 326 327 return fsc->io_adapter_map(fs, adapter->adapter_id, map_addr, do_map); 328 } 329 330 void release_indicator(AdapterInfo *adapter, IndAddr *indicator) 331 { 332 assert(indicator->refcnt > 0); 333 indicator->refcnt--; 334 if (indicator->refcnt > 0) { 335 return; 336 } 337 QTAILQ_REMOVE(&channel_subsys.indicator_addresses, indicator, sibling); 338 if (indicator->map) { 339 s390_io_adapter_map(adapter, indicator->map, false); 340 } 341 g_free(indicator); 342 } 343 344 int map_indicator(AdapterInfo *adapter, IndAddr *indicator) 345 { 346 int ret; 347 348 if (indicator->map) { 349 return 0; /* already mapped is not an error */ 350 } 351 indicator->map = indicator->addr; 352 ret = s390_io_adapter_map(adapter, indicator->map, true); 353 if ((ret != 0) && (ret != -ENOSYS)) { 354 goto out_err; 355 } 356 return 0; 357 358 out_err: 359 indicator->map = 0; 360 return ret; 361 } 362 363 int css_create_css_image(uint8_t cssid, bool default_image) 364 { 365 trace_css_new_image(cssid, default_image ? "(default)" : ""); 366 /* 255 is reserved */ 367 if (cssid == 255) { 368 return -EINVAL; 369 } 370 if (channel_subsys.css[cssid]) { 371 return -EBUSY; 372 } 373 channel_subsys.css[cssid] = g_malloc0(sizeof(CssImage)); 374 if (default_image) { 375 channel_subsys.default_cssid = cssid; 376 } 377 return 0; 378 } 379 380 uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc) 381 { 382 if (type >= CSS_IO_ADAPTER_TYPE_NUMS || isc > MAX_ISC || 383 !channel_subsys.io_adapters[type][isc]) { 384 return -1; 385 } 386 387 return channel_subsys.io_adapters[type][isc]->id; 388 } 389 390 /** 391 * css_register_io_adapters: Register I/O adapters per ISC during init 392 * 393 * @swap: an indication if byte swap is needed. 394 * @maskable: an indication if the adapter is subject to the mask operation. 395 * @errp: location to store error information. 396 */ 397 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable, 398 Error **errp) 399 { 400 uint32_t id; 401 int ret, isc; 402 IoAdapter *adapter; 403 S390FLICState *fs = s390_get_flic(); 404 S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs); 405 406 /* 407 * Disallow multiple registrations for the same device type. 408 * Report an error if registering for an already registered type. 409 */ 410 if (channel_subsys.io_adapters[type][0]) { 411 error_setg(errp, "Adapters for type %d already registered", type); 412 } 413 414 for (isc = 0; isc <= MAX_ISC; isc++) { 415 id = (type << 3) | isc; 416 ret = fsc->register_io_adapter(fs, id, isc, swap, maskable); 417 if (ret == 0) { 418 adapter = g_new0(IoAdapter, 1); 419 adapter->id = id; 420 adapter->isc = isc; 421 adapter->type = type; 422 channel_subsys.io_adapters[type][isc] = adapter; 423 } else { 424 error_setg_errno(errp, -ret, "Unexpected error %d when " 425 "registering adapter %d", ret, id); 426 break; 427 } 428 } 429 430 /* 431 * No need to free registered adapters in kvm: kvm will clean up 432 * when the machine goes away. 433 */ 434 if (ret) { 435 for (isc--; isc >= 0; isc--) { 436 g_free(channel_subsys.io_adapters[type][isc]); 437 channel_subsys.io_adapters[type][isc] = NULL; 438 } 439 } 440 441 } 442 443 static void css_clear_io_interrupt(uint16_t subchannel_id, 444 uint16_t subchannel_nr) 445 { 446 Error *err = NULL; 447 static bool no_clear_irq; 448 S390FLICState *fs = s390_get_flic(); 449 S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs); 450 int r; 451 452 if (unlikely(no_clear_irq)) { 453 return; 454 } 455 r = fsc->clear_io_irq(fs, subchannel_id, subchannel_nr); 456 switch (r) { 457 case 0: 458 break; 459 case -ENOSYS: 460 no_clear_irq = true; 461 /* 462 * Ignore unavailability, as the user can't do anything 463 * about it anyway. 464 */ 465 break; 466 default: 467 error_setg_errno(&err, -r, "unexpected error condition"); 468 error_propagate(&error_abort, err); 469 } 470 } 471 472 static inline uint16_t css_do_build_subchannel_id(uint8_t cssid, uint8_t ssid) 473 { 474 if (channel_subsys.max_cssid > 0) { 475 return (cssid << 8) | (1 << 3) | (ssid << 1) | 1; 476 } 477 return (ssid << 1) | 1; 478 } 479 480 uint16_t css_build_subchannel_id(SubchDev *sch) 481 { 482 return css_do_build_subchannel_id(sch->cssid, sch->ssid); 483 } 484 485 void css_inject_io_interrupt(SubchDev *sch) 486 { 487 uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11; 488 489 trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid, 490 sch->curr_status.pmcw.intparm, isc, ""); 491 s390_io_interrupt(css_build_subchannel_id(sch), 492 sch->schid, 493 sch->curr_status.pmcw.intparm, 494 isc << 27); 495 } 496 497 void css_conditional_io_interrupt(SubchDev *sch) 498 { 499 /* 500 * If the subchannel is not currently status pending, make it pending 501 * with alert status. 502 */ 503 if (!(sch->curr_status.scsw.ctrl & SCSW_STCTL_STATUS_PEND)) { 504 uint8_t isc = (sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ISC) >> 11; 505 506 trace_css_io_interrupt(sch->cssid, sch->ssid, sch->schid, 507 sch->curr_status.pmcw.intparm, isc, 508 "(unsolicited)"); 509 sch->curr_status.scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL; 510 sch->curr_status.scsw.ctrl |= 511 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 512 /* Inject an I/O interrupt. */ 513 s390_io_interrupt(css_build_subchannel_id(sch), 514 sch->schid, 515 sch->curr_status.pmcw.intparm, 516 isc << 27); 517 } 518 } 519 520 void css_adapter_interrupt(uint8_t isc) 521 { 522 uint32_t io_int_word = (isc << 27) | IO_INT_WORD_AI; 523 524 trace_css_adapter_interrupt(isc); 525 s390_io_interrupt(0, 0, 0, io_int_word); 526 } 527 528 static void sch_handle_clear_func(SubchDev *sch) 529 { 530 PMCW *p = &sch->curr_status.pmcw; 531 SCSW *s = &sch->curr_status.scsw; 532 int path; 533 534 /* Path management: In our simple css, we always choose the only path. */ 535 path = 0x80; 536 537 /* Reset values prior to 'issuing the clear signal'. */ 538 p->lpum = 0; 539 p->pom = 0xff; 540 s->flags &= ~SCSW_FLAGS_MASK_PNO; 541 542 /* We always 'attempt to issue the clear signal', and we always succeed. */ 543 sch->channel_prog = 0x0; 544 sch->last_cmd_valid = false; 545 s->ctrl &= ~SCSW_ACTL_CLEAR_PEND; 546 s->ctrl |= SCSW_STCTL_STATUS_PEND; 547 548 s->dstat = 0; 549 s->cstat = 0; 550 p->lpum = path; 551 552 } 553 554 static void sch_handle_halt_func(SubchDev *sch) 555 { 556 557 PMCW *p = &sch->curr_status.pmcw; 558 SCSW *s = &sch->curr_status.scsw; 559 hwaddr curr_ccw = sch->channel_prog; 560 int path; 561 562 /* Path management: In our simple css, we always choose the only path. */ 563 path = 0x80; 564 565 /* We always 'attempt to issue the halt signal', and we always succeed. */ 566 sch->channel_prog = 0x0; 567 sch->last_cmd_valid = false; 568 s->ctrl &= ~SCSW_ACTL_HALT_PEND; 569 s->ctrl |= SCSW_STCTL_STATUS_PEND; 570 571 if ((s->ctrl & (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) || 572 !((s->ctrl & SCSW_ACTL_START_PEND) || 573 (s->ctrl & SCSW_ACTL_SUSP))) { 574 s->dstat = SCSW_DSTAT_DEVICE_END; 575 } 576 if ((s->ctrl & (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) || 577 (s->ctrl & SCSW_ACTL_SUSP)) { 578 s->cpa = curr_ccw + 8; 579 } 580 s->cstat = 0; 581 p->lpum = path; 582 583 } 584 585 static void copy_sense_id_to_guest(SenseId *dest, SenseId *src) 586 { 587 int i; 588 589 dest->reserved = src->reserved; 590 dest->cu_type = cpu_to_be16(src->cu_type); 591 dest->cu_model = src->cu_model; 592 dest->dev_type = cpu_to_be16(src->dev_type); 593 dest->dev_model = src->dev_model; 594 dest->unused = src->unused; 595 for (i = 0; i < ARRAY_SIZE(dest->ciw); i++) { 596 dest->ciw[i].type = src->ciw[i].type; 597 dest->ciw[i].command = src->ciw[i].command; 598 dest->ciw[i].count = cpu_to_be16(src->ciw[i].count); 599 } 600 } 601 602 static CCW1 copy_ccw_from_guest(hwaddr addr, bool fmt1) 603 { 604 CCW0 tmp0; 605 CCW1 tmp1; 606 CCW1 ret; 607 608 if (fmt1) { 609 cpu_physical_memory_read(addr, &tmp1, sizeof(tmp1)); 610 ret.cmd_code = tmp1.cmd_code; 611 ret.flags = tmp1.flags; 612 ret.count = be16_to_cpu(tmp1.count); 613 ret.cda = be32_to_cpu(tmp1.cda); 614 } else { 615 cpu_physical_memory_read(addr, &tmp0, sizeof(tmp0)); 616 if ((tmp0.cmd_code & 0x0f) == CCW_CMD_TIC) { 617 ret.cmd_code = CCW_CMD_TIC; 618 ret.flags = 0; 619 ret.count = 0; 620 } else { 621 ret.cmd_code = tmp0.cmd_code; 622 ret.flags = tmp0.flags; 623 ret.count = be16_to_cpu(tmp0.count); 624 } 625 ret.cda = be16_to_cpu(tmp0.cda1) | (tmp0.cda0 << 16); 626 } 627 return ret; 628 } 629 630 static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr, 631 bool suspend_allowed) 632 { 633 int ret; 634 bool check_len; 635 int len; 636 CCW1 ccw; 637 638 if (!ccw_addr) { 639 return -EIO; 640 } 641 642 /* Translate everything to format-1 ccws - the information is the same. */ 643 ccw = copy_ccw_from_guest(ccw_addr, sch->ccw_fmt_1); 644 645 /* Check for invalid command codes. */ 646 if ((ccw.cmd_code & 0x0f) == 0) { 647 return -EINVAL; 648 } 649 if (((ccw.cmd_code & 0x0f) == CCW_CMD_TIC) && 650 ((ccw.cmd_code & 0xf0) != 0)) { 651 return -EINVAL; 652 } 653 if (!sch->ccw_fmt_1 && (ccw.count == 0) && 654 (ccw.cmd_code != CCW_CMD_TIC)) { 655 return -EINVAL; 656 } 657 658 /* We don't support MIDA. */ 659 if (ccw.flags & CCW_FLAG_MIDA) { 660 return -EINVAL; 661 } 662 663 if (ccw.flags & CCW_FLAG_SUSPEND) { 664 return suspend_allowed ? -EINPROGRESS : -EINVAL; 665 } 666 667 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 668 669 if (!ccw.cda) { 670 if (sch->ccw_no_data_cnt == 255) { 671 return -EINVAL; 672 } 673 sch->ccw_no_data_cnt++; 674 } 675 676 /* Look at the command. */ 677 switch (ccw.cmd_code) { 678 case CCW_CMD_NOOP: 679 /* Nothing to do. */ 680 ret = 0; 681 break; 682 case CCW_CMD_BASIC_SENSE: 683 if (check_len) { 684 if (ccw.count != sizeof(sch->sense_data)) { 685 ret = -EINVAL; 686 break; 687 } 688 } 689 len = MIN(ccw.count, sizeof(sch->sense_data)); 690 cpu_physical_memory_write(ccw.cda, sch->sense_data, len); 691 sch->curr_status.scsw.count = ccw.count - len; 692 memset(sch->sense_data, 0, sizeof(sch->sense_data)); 693 ret = 0; 694 break; 695 case CCW_CMD_SENSE_ID: 696 { 697 SenseId sense_id; 698 699 copy_sense_id_to_guest(&sense_id, &sch->id); 700 /* Sense ID information is device specific. */ 701 if (check_len) { 702 if (ccw.count != sizeof(sense_id)) { 703 ret = -EINVAL; 704 break; 705 } 706 } 707 len = MIN(ccw.count, sizeof(sense_id)); 708 /* 709 * Only indicate 0xff in the first sense byte if we actually 710 * have enough place to store at least bytes 0-3. 711 */ 712 if (len >= 4) { 713 sense_id.reserved = 0xff; 714 } else { 715 sense_id.reserved = 0; 716 } 717 cpu_physical_memory_write(ccw.cda, &sense_id, len); 718 sch->curr_status.scsw.count = ccw.count - len; 719 ret = 0; 720 break; 721 } 722 case CCW_CMD_TIC: 723 if (sch->last_cmd_valid && (sch->last_cmd.cmd_code == CCW_CMD_TIC)) { 724 ret = -EINVAL; 725 break; 726 } 727 if (ccw.flags & (CCW_FLAG_CC | CCW_FLAG_DC)) { 728 ret = -EINVAL; 729 break; 730 } 731 sch->channel_prog = ccw.cda; 732 ret = -EAGAIN; 733 break; 734 default: 735 if (sch->ccw_cb) { 736 /* Handle device specific commands. */ 737 ret = sch->ccw_cb(sch, ccw); 738 } else { 739 ret = -ENOSYS; 740 } 741 break; 742 } 743 sch->last_cmd = ccw; 744 sch->last_cmd_valid = true; 745 if (ret == 0) { 746 if (ccw.flags & CCW_FLAG_CC) { 747 sch->channel_prog += 8; 748 ret = -EAGAIN; 749 } 750 } 751 752 return ret; 753 } 754 755 static void sch_handle_start_func_virtual(SubchDev *sch, ORB *orb) 756 { 757 758 PMCW *p = &sch->curr_status.pmcw; 759 SCSW *s = &sch->curr_status.scsw; 760 int path; 761 int ret; 762 bool suspend_allowed; 763 764 /* Path management: In our simple css, we always choose the only path. */ 765 path = 0x80; 766 767 if (!(s->ctrl & SCSW_ACTL_SUSP)) { 768 /* Start Function triggered via ssch, i.e. we have an ORB */ 769 s->cstat = 0; 770 s->dstat = 0; 771 /* Look at the orb and try to execute the channel program. */ 772 assert(orb != NULL); /* resume does not pass an orb */ 773 p->intparm = orb->intparm; 774 if (!(orb->lpm & path)) { 775 /* Generate a deferred cc 3 condition. */ 776 s->flags |= SCSW_FLAGS_MASK_CC; 777 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 778 s->ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND); 779 return; 780 } 781 sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT); 782 s->flags |= (sch->ccw_fmt_1) ? SCSW_FLAGS_MASK_FMT : 0; 783 sch->ccw_no_data_cnt = 0; 784 suspend_allowed = !!(orb->ctrl0 & ORB_CTRL0_MASK_SPND); 785 } else { 786 /* Start Function resumed via rsch, i.e. we don't have an 787 * ORB */ 788 s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND); 789 /* The channel program had been suspended before. */ 790 suspend_allowed = true; 791 } 792 sch->last_cmd_valid = false; 793 do { 794 ret = css_interpret_ccw(sch, sch->channel_prog, suspend_allowed); 795 switch (ret) { 796 case -EAGAIN: 797 /* ccw chain, continue processing */ 798 break; 799 case 0: 800 /* success */ 801 s->ctrl &= ~SCSW_ACTL_START_PEND; 802 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 803 s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 804 SCSW_STCTL_STATUS_PEND; 805 s->dstat = SCSW_DSTAT_CHANNEL_END | SCSW_DSTAT_DEVICE_END; 806 s->cpa = sch->channel_prog + 8; 807 break; 808 case -EIO: 809 /* I/O errors, status depends on specific devices */ 810 break; 811 case -ENOSYS: 812 /* unsupported command, generate unit check (command reject) */ 813 s->ctrl &= ~SCSW_ACTL_START_PEND; 814 s->dstat = SCSW_DSTAT_UNIT_CHECK; 815 /* Set sense bit 0 in ecw0. */ 816 sch->sense_data[0] = 0x80; 817 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 818 s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 819 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 820 s->cpa = sch->channel_prog + 8; 821 break; 822 case -EFAULT: 823 /* memory problem, generate channel data check */ 824 s->ctrl &= ~SCSW_ACTL_START_PEND; 825 s->cstat = SCSW_CSTAT_DATA_CHECK; 826 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 827 s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 828 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 829 s->cpa = sch->channel_prog + 8; 830 break; 831 case -EBUSY: 832 /* subchannel busy, generate deferred cc 1 */ 833 s->flags &= ~SCSW_FLAGS_MASK_CC; 834 s->flags |= (1 << 8); 835 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 836 s->ctrl |= SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 837 break; 838 case -EINPROGRESS: 839 /* channel program has been suspended */ 840 s->ctrl &= ~SCSW_ACTL_START_PEND; 841 s->ctrl |= SCSW_ACTL_SUSP; 842 break; 843 default: 844 /* error, generate channel program check */ 845 s->ctrl &= ~SCSW_ACTL_START_PEND; 846 s->cstat = SCSW_CSTAT_PROG_CHECK; 847 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 848 s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY | 849 SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND; 850 s->cpa = sch->channel_prog + 8; 851 break; 852 } 853 } while (ret == -EAGAIN); 854 855 } 856 857 static int sch_handle_start_func_passthrough(SubchDev *sch, ORB *orb) 858 { 859 860 PMCW *p = &sch->curr_status.pmcw; 861 SCSW *s = &sch->curr_status.scsw; 862 int ret; 863 864 if (!(s->ctrl & SCSW_ACTL_SUSP)) { 865 assert(orb != NULL); 866 p->intparm = orb->intparm; 867 } 868 869 /* 870 * Only support prefetch enable mode. 871 * Only support 64bit addressing idal. 872 */ 873 if (!(orb->ctrl0 & ORB_CTRL0_MASK_PFCH) || 874 !(orb->ctrl0 & ORB_CTRL0_MASK_C64)) { 875 return -EINVAL; 876 } 877 878 ret = s390_ccw_cmd_request(orb, s, sch->driver_data); 879 switch (ret) { 880 /* Currently we don't update control block and just return the cc code. */ 881 case 0: 882 break; 883 case -EBUSY: 884 break; 885 case -ENODEV: 886 break; 887 case -EACCES: 888 /* Let's reflect an inaccessible host device by cc 3. */ 889 ret = -ENODEV; 890 break; 891 default: 892 /* 893 * All other return codes will trigger a program check, 894 * or set cc to 1. 895 */ 896 break; 897 }; 898 899 return ret; 900 } 901 902 /* 903 * On real machines, this would run asynchronously to the main vcpus. 904 * We might want to make some parts of the ssch handling (interpreting 905 * read/writes) asynchronous later on if we start supporting more than 906 * our current very simple devices. 907 */ 908 int do_subchannel_work_virtual(SubchDev *sch, ORB *orb) 909 { 910 911 SCSW *s = &sch->curr_status.scsw; 912 913 if (s->ctrl & SCSW_FCTL_CLEAR_FUNC) { 914 sch_handle_clear_func(sch); 915 } else if (s->ctrl & SCSW_FCTL_HALT_FUNC) { 916 sch_handle_halt_func(sch); 917 } else if (s->ctrl & SCSW_FCTL_START_FUNC) { 918 /* Triggered by both ssch and rsch. */ 919 sch_handle_start_func_virtual(sch, orb); 920 } else { 921 /* Cannot happen. */ 922 return 0; 923 } 924 css_inject_io_interrupt(sch); 925 return 0; 926 } 927 928 int do_subchannel_work_passthrough(SubchDev *sch, ORB *orb) 929 { 930 int ret; 931 SCSW *s = &sch->curr_status.scsw; 932 933 if (s->ctrl & SCSW_FCTL_CLEAR_FUNC) { 934 /* TODO: Clear handling */ 935 sch_handle_clear_func(sch); 936 ret = 0; 937 } else if (s->ctrl & SCSW_FCTL_HALT_FUNC) { 938 /* TODO: Halt handling */ 939 sch_handle_halt_func(sch); 940 ret = 0; 941 } else if (s->ctrl & SCSW_FCTL_START_FUNC) { 942 ret = sch_handle_start_func_passthrough(sch, orb); 943 } else { 944 /* Cannot happen. */ 945 return -ENODEV; 946 } 947 948 return ret; 949 } 950 951 static int do_subchannel_work(SubchDev *sch, ORB *orb) 952 { 953 if (sch->do_subchannel_work) { 954 return sch->do_subchannel_work(sch, orb); 955 } else { 956 return -EINVAL; 957 } 958 } 959 960 static void copy_pmcw_to_guest(PMCW *dest, const PMCW *src) 961 { 962 int i; 963 964 dest->intparm = cpu_to_be32(src->intparm); 965 dest->flags = cpu_to_be16(src->flags); 966 dest->devno = cpu_to_be16(src->devno); 967 dest->lpm = src->lpm; 968 dest->pnom = src->pnom; 969 dest->lpum = src->lpum; 970 dest->pim = src->pim; 971 dest->mbi = cpu_to_be16(src->mbi); 972 dest->pom = src->pom; 973 dest->pam = src->pam; 974 for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) { 975 dest->chpid[i] = src->chpid[i]; 976 } 977 dest->chars = cpu_to_be32(src->chars); 978 } 979 980 void copy_scsw_to_guest(SCSW *dest, const SCSW *src) 981 { 982 dest->flags = cpu_to_be16(src->flags); 983 dest->ctrl = cpu_to_be16(src->ctrl); 984 dest->cpa = cpu_to_be32(src->cpa); 985 dest->dstat = src->dstat; 986 dest->cstat = src->cstat; 987 dest->count = cpu_to_be16(src->count); 988 } 989 990 static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src) 991 { 992 int i; 993 994 copy_pmcw_to_guest(&dest->pmcw, &src->pmcw); 995 copy_scsw_to_guest(&dest->scsw, &src->scsw); 996 dest->mba = cpu_to_be64(src->mba); 997 for (i = 0; i < ARRAY_SIZE(dest->mda); i++) { 998 dest->mda[i] = src->mda[i]; 999 } 1000 } 1001 1002 int css_do_stsch(SubchDev *sch, SCHIB *schib) 1003 { 1004 /* Use current status. */ 1005 copy_schib_to_guest(schib, &sch->curr_status); 1006 return 0; 1007 } 1008 1009 static void copy_pmcw_from_guest(PMCW *dest, const PMCW *src) 1010 { 1011 int i; 1012 1013 dest->intparm = be32_to_cpu(src->intparm); 1014 dest->flags = be16_to_cpu(src->flags); 1015 dest->devno = be16_to_cpu(src->devno); 1016 dest->lpm = src->lpm; 1017 dest->pnom = src->pnom; 1018 dest->lpum = src->lpum; 1019 dest->pim = src->pim; 1020 dest->mbi = be16_to_cpu(src->mbi); 1021 dest->pom = src->pom; 1022 dest->pam = src->pam; 1023 for (i = 0; i < ARRAY_SIZE(dest->chpid); i++) { 1024 dest->chpid[i] = src->chpid[i]; 1025 } 1026 dest->chars = be32_to_cpu(src->chars); 1027 } 1028 1029 static void copy_scsw_from_guest(SCSW *dest, const SCSW *src) 1030 { 1031 dest->flags = be16_to_cpu(src->flags); 1032 dest->ctrl = be16_to_cpu(src->ctrl); 1033 dest->cpa = be32_to_cpu(src->cpa); 1034 dest->dstat = src->dstat; 1035 dest->cstat = src->cstat; 1036 dest->count = be16_to_cpu(src->count); 1037 } 1038 1039 static void copy_schib_from_guest(SCHIB *dest, const SCHIB *src) 1040 { 1041 int i; 1042 1043 copy_pmcw_from_guest(&dest->pmcw, &src->pmcw); 1044 copy_scsw_from_guest(&dest->scsw, &src->scsw); 1045 dest->mba = be64_to_cpu(src->mba); 1046 for (i = 0; i < ARRAY_SIZE(dest->mda); i++) { 1047 dest->mda[i] = src->mda[i]; 1048 } 1049 } 1050 1051 int css_do_msch(SubchDev *sch, const SCHIB *orig_schib) 1052 { 1053 SCSW *s = &sch->curr_status.scsw; 1054 PMCW *p = &sch->curr_status.pmcw; 1055 uint16_t oldflags; 1056 int ret; 1057 SCHIB schib; 1058 1059 if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_DNV)) { 1060 ret = 0; 1061 goto out; 1062 } 1063 1064 if (s->ctrl & SCSW_STCTL_STATUS_PEND) { 1065 ret = -EINPROGRESS; 1066 goto out; 1067 } 1068 1069 if (s->ctrl & 1070 (SCSW_FCTL_START_FUNC|SCSW_FCTL_HALT_FUNC|SCSW_FCTL_CLEAR_FUNC)) { 1071 ret = -EBUSY; 1072 goto out; 1073 } 1074 1075 copy_schib_from_guest(&schib, orig_schib); 1076 /* Only update the program-modifiable fields. */ 1077 p->intparm = schib.pmcw.intparm; 1078 oldflags = p->flags; 1079 p->flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA | 1080 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME | 1081 PMCW_FLAGS_MASK_MP); 1082 p->flags |= schib.pmcw.flags & 1083 (PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA | 1084 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME | 1085 PMCW_FLAGS_MASK_MP); 1086 p->lpm = schib.pmcw.lpm; 1087 p->mbi = schib.pmcw.mbi; 1088 p->pom = schib.pmcw.pom; 1089 p->chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE); 1090 p->chars |= schib.pmcw.chars & 1091 (PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_CSENSE); 1092 sch->curr_status.mba = schib.mba; 1093 1094 /* Has the channel been disabled? */ 1095 if (sch->disable_cb && (oldflags & PMCW_FLAGS_MASK_ENA) != 0 1096 && (p->flags & PMCW_FLAGS_MASK_ENA) == 0) { 1097 sch->disable_cb(sch); 1098 } 1099 1100 ret = 0; 1101 1102 out: 1103 return ret; 1104 } 1105 1106 int css_do_xsch(SubchDev *sch) 1107 { 1108 SCSW *s = &sch->curr_status.scsw; 1109 PMCW *p = &sch->curr_status.pmcw; 1110 int ret; 1111 1112 if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1113 ret = -ENODEV; 1114 goto out; 1115 } 1116 1117 if (!(s->ctrl & SCSW_CTRL_MASK_FCTL) || 1118 ((s->ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) || 1119 (!(s->ctrl & 1120 (SCSW_ACTL_RESUME_PEND | SCSW_ACTL_START_PEND | SCSW_ACTL_SUSP))) || 1121 (s->ctrl & SCSW_ACTL_SUBCH_ACTIVE)) { 1122 ret = -EINPROGRESS; 1123 goto out; 1124 } 1125 1126 if (s->ctrl & SCSW_CTRL_MASK_STCTL) { 1127 ret = -EBUSY; 1128 goto out; 1129 } 1130 1131 /* Cancel the current operation. */ 1132 s->ctrl &= ~(SCSW_FCTL_START_FUNC | 1133 SCSW_ACTL_RESUME_PEND | 1134 SCSW_ACTL_START_PEND | 1135 SCSW_ACTL_SUSP); 1136 sch->channel_prog = 0x0; 1137 sch->last_cmd_valid = false; 1138 s->dstat = 0; 1139 s->cstat = 0; 1140 ret = 0; 1141 1142 out: 1143 return ret; 1144 } 1145 1146 int css_do_csch(SubchDev *sch) 1147 { 1148 SCSW *s = &sch->curr_status.scsw; 1149 PMCW *p = &sch->curr_status.pmcw; 1150 int ret; 1151 1152 if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1153 ret = -ENODEV; 1154 goto out; 1155 } 1156 1157 /* Trigger the clear function. */ 1158 s->ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL); 1159 s->ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_ACTL_CLEAR_PEND; 1160 1161 do_subchannel_work(sch, NULL); 1162 ret = 0; 1163 1164 out: 1165 return ret; 1166 } 1167 1168 int css_do_hsch(SubchDev *sch) 1169 { 1170 SCSW *s = &sch->curr_status.scsw; 1171 PMCW *p = &sch->curr_status.pmcw; 1172 int ret; 1173 1174 if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1175 ret = -ENODEV; 1176 goto out; 1177 } 1178 1179 if (((s->ctrl & SCSW_CTRL_MASK_STCTL) == SCSW_STCTL_STATUS_PEND) || 1180 (s->ctrl & (SCSW_STCTL_PRIMARY | 1181 SCSW_STCTL_SECONDARY | 1182 SCSW_STCTL_ALERT))) { 1183 ret = -EINPROGRESS; 1184 goto out; 1185 } 1186 1187 if (s->ctrl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) { 1188 ret = -EBUSY; 1189 goto out; 1190 } 1191 1192 /* Trigger the halt function. */ 1193 s->ctrl |= SCSW_FCTL_HALT_FUNC; 1194 s->ctrl &= ~SCSW_FCTL_START_FUNC; 1195 if (((s->ctrl & SCSW_CTRL_MASK_ACTL) == 1196 (SCSW_ACTL_SUBCH_ACTIVE | SCSW_ACTL_DEVICE_ACTIVE)) && 1197 ((s->ctrl & SCSW_CTRL_MASK_STCTL) == SCSW_STCTL_INTERMEDIATE)) { 1198 s->ctrl &= ~SCSW_STCTL_STATUS_PEND; 1199 } 1200 s->ctrl |= SCSW_ACTL_HALT_PEND; 1201 1202 do_subchannel_work(sch, NULL); 1203 ret = 0; 1204 1205 out: 1206 return ret; 1207 } 1208 1209 static void css_update_chnmon(SubchDev *sch) 1210 { 1211 if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_MME)) { 1212 /* Not active. */ 1213 return; 1214 } 1215 /* The counter is conveniently located at the beginning of the struct. */ 1216 if (sch->curr_status.pmcw.chars & PMCW_CHARS_MASK_MBFC) { 1217 /* Format 1, per-subchannel area. */ 1218 uint32_t count; 1219 1220 count = address_space_ldl(&address_space_memory, 1221 sch->curr_status.mba, 1222 MEMTXATTRS_UNSPECIFIED, 1223 NULL); 1224 count++; 1225 address_space_stl(&address_space_memory, sch->curr_status.mba, count, 1226 MEMTXATTRS_UNSPECIFIED, NULL); 1227 } else { 1228 /* Format 0, global area. */ 1229 uint32_t offset; 1230 uint16_t count; 1231 1232 offset = sch->curr_status.pmcw.mbi << 5; 1233 count = address_space_lduw(&address_space_memory, 1234 channel_subsys.chnmon_area + offset, 1235 MEMTXATTRS_UNSPECIFIED, 1236 NULL); 1237 count++; 1238 address_space_stw(&address_space_memory, 1239 channel_subsys.chnmon_area + offset, count, 1240 MEMTXATTRS_UNSPECIFIED, NULL); 1241 } 1242 } 1243 1244 int css_do_ssch(SubchDev *sch, ORB *orb) 1245 { 1246 SCSW *s = &sch->curr_status.scsw; 1247 PMCW *p = &sch->curr_status.pmcw; 1248 int ret; 1249 1250 if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1251 ret = -ENODEV; 1252 goto out; 1253 } 1254 1255 if (s->ctrl & SCSW_STCTL_STATUS_PEND) { 1256 ret = -EINPROGRESS; 1257 goto out; 1258 } 1259 1260 if (s->ctrl & (SCSW_FCTL_START_FUNC | 1261 SCSW_FCTL_HALT_FUNC | 1262 SCSW_FCTL_CLEAR_FUNC)) { 1263 ret = -EBUSY; 1264 goto out; 1265 } 1266 1267 /* If monitoring is active, update counter. */ 1268 if (channel_subsys.chnmon_active) { 1269 css_update_chnmon(sch); 1270 } 1271 sch->channel_prog = orb->cpa; 1272 /* Trigger the start function. */ 1273 s->ctrl |= (SCSW_FCTL_START_FUNC | SCSW_ACTL_START_PEND); 1274 s->flags &= ~SCSW_FLAGS_MASK_PNO; 1275 1276 ret = do_subchannel_work(sch, orb); 1277 1278 out: 1279 return ret; 1280 } 1281 1282 static void copy_irb_to_guest(IRB *dest, const IRB *src, PMCW *pmcw, 1283 int *irb_len) 1284 { 1285 int i; 1286 uint16_t stctl = src->scsw.ctrl & SCSW_CTRL_MASK_STCTL; 1287 uint16_t actl = src->scsw.ctrl & SCSW_CTRL_MASK_ACTL; 1288 1289 copy_scsw_to_guest(&dest->scsw, &src->scsw); 1290 1291 for (i = 0; i < ARRAY_SIZE(dest->esw); i++) { 1292 dest->esw[i] = cpu_to_be32(src->esw[i]); 1293 } 1294 for (i = 0; i < ARRAY_SIZE(dest->ecw); i++) { 1295 dest->ecw[i] = cpu_to_be32(src->ecw[i]); 1296 } 1297 *irb_len = sizeof(*dest) - sizeof(dest->emw); 1298 1299 /* extended measurements enabled? */ 1300 if ((src->scsw.flags & SCSW_FLAGS_MASK_ESWF) || 1301 !(pmcw->flags & PMCW_FLAGS_MASK_TF) || 1302 !(pmcw->chars & PMCW_CHARS_MASK_XMWME)) { 1303 return; 1304 } 1305 /* extended measurements pending? */ 1306 if (!(stctl & SCSW_STCTL_STATUS_PEND)) { 1307 return; 1308 } 1309 if ((stctl & SCSW_STCTL_PRIMARY) || 1310 (stctl == SCSW_STCTL_SECONDARY) || 1311 ((stctl & SCSW_STCTL_INTERMEDIATE) && (actl & SCSW_ACTL_SUSP))) { 1312 for (i = 0; i < ARRAY_SIZE(dest->emw); i++) { 1313 dest->emw[i] = cpu_to_be32(src->emw[i]); 1314 } 1315 } 1316 *irb_len = sizeof(*dest); 1317 } 1318 1319 int css_do_tsch_get_irb(SubchDev *sch, IRB *target_irb, int *irb_len) 1320 { 1321 SCSW *s = &sch->curr_status.scsw; 1322 PMCW *p = &sch->curr_status.pmcw; 1323 uint16_t stctl; 1324 IRB irb; 1325 1326 if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1327 return 3; 1328 } 1329 1330 stctl = s->ctrl & SCSW_CTRL_MASK_STCTL; 1331 1332 /* Prepare the irb for the guest. */ 1333 memset(&irb, 0, sizeof(IRB)); 1334 1335 /* Copy scsw from current status. */ 1336 memcpy(&irb.scsw, s, sizeof(SCSW)); 1337 if (stctl & SCSW_STCTL_STATUS_PEND) { 1338 if (s->cstat & (SCSW_CSTAT_DATA_CHECK | 1339 SCSW_CSTAT_CHN_CTRL_CHK | 1340 SCSW_CSTAT_INTF_CTRL_CHK)) { 1341 irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF; 1342 irb.esw[0] = 0x04804000; 1343 } else { 1344 irb.esw[0] = 0x00800000; 1345 } 1346 /* If a unit check is pending, copy sense data. */ 1347 if ((s->dstat & SCSW_DSTAT_UNIT_CHECK) && 1348 (p->chars & PMCW_CHARS_MASK_CSENSE)) { 1349 int i; 1350 1351 irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF | SCSW_FLAGS_MASK_ECTL; 1352 /* Attention: sense_data is already BE! */ 1353 memcpy(irb.ecw, sch->sense_data, sizeof(sch->sense_data)); 1354 for (i = 0; i < ARRAY_SIZE(irb.ecw); i++) { 1355 irb.ecw[i] = be32_to_cpu(irb.ecw[i]); 1356 } 1357 irb.esw[1] = 0x01000000 | (sizeof(sch->sense_data) << 8); 1358 } 1359 } 1360 /* Store the irb to the guest. */ 1361 copy_irb_to_guest(target_irb, &irb, p, irb_len); 1362 1363 return ((stctl & SCSW_STCTL_STATUS_PEND) == 0); 1364 } 1365 1366 void css_do_tsch_update_subch(SubchDev *sch) 1367 { 1368 SCSW *s = &sch->curr_status.scsw; 1369 PMCW *p = &sch->curr_status.pmcw; 1370 uint16_t stctl; 1371 uint16_t fctl; 1372 uint16_t actl; 1373 1374 stctl = s->ctrl & SCSW_CTRL_MASK_STCTL; 1375 fctl = s->ctrl & SCSW_CTRL_MASK_FCTL; 1376 actl = s->ctrl & SCSW_CTRL_MASK_ACTL; 1377 1378 /* Clear conditions on subchannel, if applicable. */ 1379 if (stctl & SCSW_STCTL_STATUS_PEND) { 1380 s->ctrl &= ~SCSW_CTRL_MASK_STCTL; 1381 if ((stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) || 1382 ((fctl & SCSW_FCTL_HALT_FUNC) && 1383 (actl & SCSW_ACTL_SUSP))) { 1384 s->ctrl &= ~SCSW_CTRL_MASK_FCTL; 1385 } 1386 if (stctl != (SCSW_STCTL_INTERMEDIATE | SCSW_STCTL_STATUS_PEND)) { 1387 s->flags &= ~SCSW_FLAGS_MASK_PNO; 1388 s->ctrl &= ~(SCSW_ACTL_RESUME_PEND | 1389 SCSW_ACTL_START_PEND | 1390 SCSW_ACTL_HALT_PEND | 1391 SCSW_ACTL_CLEAR_PEND | 1392 SCSW_ACTL_SUSP); 1393 } else { 1394 if ((actl & SCSW_ACTL_SUSP) && 1395 (fctl & SCSW_FCTL_START_FUNC)) { 1396 s->flags &= ~SCSW_FLAGS_MASK_PNO; 1397 if (fctl & SCSW_FCTL_HALT_FUNC) { 1398 s->ctrl &= ~(SCSW_ACTL_RESUME_PEND | 1399 SCSW_ACTL_START_PEND | 1400 SCSW_ACTL_HALT_PEND | 1401 SCSW_ACTL_CLEAR_PEND | 1402 SCSW_ACTL_SUSP); 1403 } else { 1404 s->ctrl &= ~SCSW_ACTL_RESUME_PEND; 1405 } 1406 } 1407 } 1408 /* Clear pending sense data. */ 1409 if (p->chars & PMCW_CHARS_MASK_CSENSE) { 1410 memset(sch->sense_data, 0 , sizeof(sch->sense_data)); 1411 } 1412 } 1413 } 1414 1415 static void copy_crw_to_guest(CRW *dest, const CRW *src) 1416 { 1417 dest->flags = cpu_to_be16(src->flags); 1418 dest->rsid = cpu_to_be16(src->rsid); 1419 } 1420 1421 int css_do_stcrw(CRW *crw) 1422 { 1423 CrwContainer *crw_cont; 1424 int ret; 1425 1426 crw_cont = QTAILQ_FIRST(&channel_subsys.pending_crws); 1427 if (crw_cont) { 1428 QTAILQ_REMOVE(&channel_subsys.pending_crws, crw_cont, sibling); 1429 copy_crw_to_guest(crw, &crw_cont->crw); 1430 g_free(crw_cont); 1431 ret = 0; 1432 } else { 1433 /* List was empty, turn crw machine checks on again. */ 1434 memset(crw, 0, sizeof(*crw)); 1435 channel_subsys.do_crw_mchk = true; 1436 ret = 1; 1437 } 1438 1439 return ret; 1440 } 1441 1442 static void copy_crw_from_guest(CRW *dest, const CRW *src) 1443 { 1444 dest->flags = be16_to_cpu(src->flags); 1445 dest->rsid = be16_to_cpu(src->rsid); 1446 } 1447 1448 void css_undo_stcrw(CRW *crw) 1449 { 1450 CrwContainer *crw_cont; 1451 1452 crw_cont = g_try_malloc0(sizeof(CrwContainer)); 1453 if (!crw_cont) { 1454 channel_subsys.crws_lost = true; 1455 return; 1456 } 1457 copy_crw_from_guest(&crw_cont->crw, crw); 1458 1459 QTAILQ_INSERT_HEAD(&channel_subsys.pending_crws, crw_cont, sibling); 1460 } 1461 1462 int css_do_tpi(IOIntCode *int_code, int lowcore) 1463 { 1464 /* No pending interrupts for !KVM. */ 1465 return 0; 1466 } 1467 1468 int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid, 1469 int rfmt, void *buf) 1470 { 1471 int i, desc_size; 1472 uint32_t words[8]; 1473 uint32_t chpid_type_word; 1474 CssImage *css; 1475 1476 if (!m && !cssid) { 1477 css = channel_subsys.css[channel_subsys.default_cssid]; 1478 } else { 1479 css = channel_subsys.css[cssid]; 1480 } 1481 if (!css) { 1482 return 0; 1483 } 1484 desc_size = 0; 1485 for (i = f_chpid; i <= l_chpid; i++) { 1486 if (css->chpids[i].in_use) { 1487 chpid_type_word = 0x80000000 | (css->chpids[i].type << 8) | i; 1488 if (rfmt == 0) { 1489 words[0] = cpu_to_be32(chpid_type_word); 1490 words[1] = 0; 1491 memcpy(buf + desc_size, words, 8); 1492 desc_size += 8; 1493 } else if (rfmt == 1) { 1494 words[0] = cpu_to_be32(chpid_type_word); 1495 words[1] = 0; 1496 words[2] = 0; 1497 words[3] = 0; 1498 words[4] = 0; 1499 words[5] = 0; 1500 words[6] = 0; 1501 words[7] = 0; 1502 memcpy(buf + desc_size, words, 32); 1503 desc_size += 32; 1504 } 1505 } 1506 } 1507 return desc_size; 1508 } 1509 1510 void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo) 1511 { 1512 /* dct is currently ignored (not really meaningful for our devices) */ 1513 /* TODO: Don't ignore mbk. */ 1514 if (update && !channel_subsys.chnmon_active) { 1515 /* Enable measuring. */ 1516 channel_subsys.chnmon_area = mbo; 1517 channel_subsys.chnmon_active = true; 1518 } 1519 if (!update && channel_subsys.chnmon_active) { 1520 /* Disable measuring. */ 1521 channel_subsys.chnmon_area = 0; 1522 channel_subsys.chnmon_active = false; 1523 } 1524 } 1525 1526 int css_do_rsch(SubchDev *sch) 1527 { 1528 SCSW *s = &sch->curr_status.scsw; 1529 PMCW *p = &sch->curr_status.pmcw; 1530 int ret; 1531 1532 if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { 1533 ret = -ENODEV; 1534 goto out; 1535 } 1536 1537 if (s->ctrl & SCSW_STCTL_STATUS_PEND) { 1538 ret = -EINPROGRESS; 1539 goto out; 1540 } 1541 1542 if (((s->ctrl & SCSW_CTRL_MASK_FCTL) != SCSW_FCTL_START_FUNC) || 1543 (s->ctrl & SCSW_ACTL_RESUME_PEND) || 1544 (!(s->ctrl & SCSW_ACTL_SUSP))) { 1545 ret = -EINVAL; 1546 goto out; 1547 } 1548 1549 /* If monitoring is active, update counter. */ 1550 if (channel_subsys.chnmon_active) { 1551 css_update_chnmon(sch); 1552 } 1553 1554 s->ctrl |= SCSW_ACTL_RESUME_PEND; 1555 do_subchannel_work(sch, NULL); 1556 ret = 0; 1557 1558 out: 1559 return ret; 1560 } 1561 1562 int css_do_rchp(uint8_t cssid, uint8_t chpid) 1563 { 1564 uint8_t real_cssid; 1565 1566 if (cssid > channel_subsys.max_cssid) { 1567 return -EINVAL; 1568 } 1569 if (channel_subsys.max_cssid == 0) { 1570 real_cssid = channel_subsys.default_cssid; 1571 } else { 1572 real_cssid = cssid; 1573 } 1574 if (!channel_subsys.css[real_cssid]) { 1575 return -EINVAL; 1576 } 1577 1578 if (!channel_subsys.css[real_cssid]->chpids[chpid].in_use) { 1579 return -ENODEV; 1580 } 1581 1582 if (!channel_subsys.css[real_cssid]->chpids[chpid].is_virtual) { 1583 fprintf(stderr, 1584 "rchp unsupported for non-virtual chpid %x.%02x!\n", 1585 real_cssid, chpid); 1586 return -ENODEV; 1587 } 1588 1589 /* We don't really use a channel path, so we're done here. */ 1590 css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 1591 channel_subsys.max_cssid > 0 ? 1 : 0, chpid); 1592 if (channel_subsys.max_cssid > 0) { 1593 css_queue_crw(CRW_RSC_CHP, CRW_ERC_INIT, 0, real_cssid << 8); 1594 } 1595 return 0; 1596 } 1597 1598 bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid) 1599 { 1600 SubchSet *set; 1601 uint8_t real_cssid; 1602 1603 real_cssid = (!m && (cssid == 0)) ? channel_subsys.default_cssid : cssid; 1604 if (ssid > MAX_SSID || 1605 !channel_subsys.css[real_cssid] || 1606 !channel_subsys.css[real_cssid]->sch_set[ssid]) { 1607 return true; 1608 } 1609 set = channel_subsys.css[real_cssid]->sch_set[ssid]; 1610 return schid > find_last_bit(set->schids_used, 1611 (MAX_SCHID + 1) / sizeof(unsigned long)); 1612 } 1613 1614 unsigned int css_find_free_chpid(uint8_t cssid) 1615 { 1616 CssImage *css = channel_subsys.css[cssid]; 1617 unsigned int chpid; 1618 1619 if (!css) { 1620 return MAX_CHPID + 1; 1621 } 1622 1623 for (chpid = 0; chpid <= MAX_CHPID; chpid++) { 1624 /* skip reserved chpid */ 1625 if (chpid == VIRTIO_CCW_CHPID) { 1626 continue; 1627 } 1628 if (!css->chpids[chpid].in_use) { 1629 return chpid; 1630 } 1631 } 1632 return MAX_CHPID + 1; 1633 } 1634 1635 static int css_add_chpid(uint8_t cssid, uint8_t chpid, uint8_t type, 1636 bool is_virt) 1637 { 1638 CssImage *css; 1639 1640 trace_css_chpid_add(cssid, chpid, type); 1641 css = channel_subsys.css[cssid]; 1642 if (!css) { 1643 return -EINVAL; 1644 } 1645 if (css->chpids[chpid].in_use) { 1646 return -EEXIST; 1647 } 1648 css->chpids[chpid].in_use = 1; 1649 css->chpids[chpid].type = type; 1650 css->chpids[chpid].is_virtual = is_virt; 1651 1652 css_generate_chp_crws(cssid, chpid); 1653 1654 return 0; 1655 } 1656 1657 void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type) 1658 { 1659 PMCW *p = &sch->curr_status.pmcw; 1660 SCSW *s = &sch->curr_status.scsw; 1661 int i; 1662 CssImage *css = channel_subsys.css[sch->cssid]; 1663 1664 assert(css != NULL); 1665 memset(p, 0, sizeof(PMCW)); 1666 p->flags |= PMCW_FLAGS_MASK_DNV; 1667 p->devno = sch->devno; 1668 /* single path */ 1669 p->pim = 0x80; 1670 p->pom = 0xff; 1671 p->pam = 0x80; 1672 p->chpid[0] = chpid; 1673 if (!css->chpids[chpid].in_use) { 1674 css_add_chpid(sch->cssid, chpid, type, true); 1675 } 1676 1677 memset(s, 0, sizeof(SCSW)); 1678 sch->curr_status.mba = 0; 1679 for (i = 0; i < ARRAY_SIZE(sch->curr_status.mda); i++) { 1680 sch->curr_status.mda[i] = 0; 1681 } 1682 } 1683 1684 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid, uint16_t schid) 1685 { 1686 uint8_t real_cssid; 1687 1688 real_cssid = (!m && (cssid == 0)) ? channel_subsys.default_cssid : cssid; 1689 1690 if (!channel_subsys.css[real_cssid]) { 1691 return NULL; 1692 } 1693 1694 if (!channel_subsys.css[real_cssid]->sch_set[ssid]) { 1695 return NULL; 1696 } 1697 1698 return channel_subsys.css[real_cssid]->sch_set[ssid]->sch[schid]; 1699 } 1700 1701 /** 1702 * Return free device number in subchannel set. 1703 * 1704 * Return index of the first free device number in the subchannel set 1705 * identified by @p cssid and @p ssid, beginning the search at @p 1706 * start and wrapping around at MAX_DEVNO. Return a value exceeding 1707 * MAX_SCHID if there are no free device numbers in the subchannel 1708 * set. 1709 */ 1710 static uint32_t css_find_free_devno(uint8_t cssid, uint8_t ssid, 1711 uint16_t start) 1712 { 1713 uint32_t round; 1714 1715 for (round = 0; round <= MAX_DEVNO; round++) { 1716 uint16_t devno = (start + round) % MAX_DEVNO; 1717 1718 if (!css_devno_used(cssid, ssid, devno)) { 1719 return devno; 1720 } 1721 } 1722 return MAX_DEVNO + 1; 1723 } 1724 1725 /** 1726 * Return first free subchannel (id) in subchannel set. 1727 * 1728 * Return index of the first free subchannel in the subchannel set 1729 * identified by @p cssid and @p ssid, if there is any. Return a value 1730 * exceeding MAX_SCHID if there are no free subchannels in the 1731 * subchannel set. 1732 */ 1733 static uint32_t css_find_free_subch(uint8_t cssid, uint8_t ssid) 1734 { 1735 uint32_t schid; 1736 1737 for (schid = 0; schid <= MAX_SCHID; schid++) { 1738 if (!css_find_subch(1, cssid, ssid, schid)) { 1739 return schid; 1740 } 1741 } 1742 return MAX_SCHID + 1; 1743 } 1744 1745 /** 1746 * Return first free subchannel (id) in subchannel set for a device number 1747 * 1748 * Verify the device number @p devno is not used yet in the subchannel 1749 * set identified by @p cssid and @p ssid. Set @p schid to the index 1750 * of the first free subchannel in the subchannel set, if there is 1751 * any. Return true if everything succeeded and false otherwise. 1752 */ 1753 static bool css_find_free_subch_for_devno(uint8_t cssid, uint8_t ssid, 1754 uint16_t devno, uint16_t *schid, 1755 Error **errp) 1756 { 1757 uint32_t free_schid; 1758 1759 assert(schid); 1760 if (css_devno_used(cssid, ssid, devno)) { 1761 error_setg(errp, "Device %x.%x.%04x already exists", 1762 cssid, ssid, devno); 1763 return false; 1764 } 1765 free_schid = css_find_free_subch(cssid, ssid); 1766 if (free_schid > MAX_SCHID) { 1767 error_setg(errp, "No free subchannel found for %x.%x.%04x", 1768 cssid, ssid, devno); 1769 return false; 1770 } 1771 *schid = free_schid; 1772 return true; 1773 } 1774 1775 /** 1776 * Return first free subchannel (id) and device number 1777 * 1778 * Locate the first free subchannel and first free device number in 1779 * any of the subchannel sets of the channel subsystem identified by 1780 * @p cssid. Return false if no free subchannel / device number could 1781 * be found. Otherwise set @p ssid, @p devno and @p schid to identify 1782 * the available subchannel and device number and return true. 1783 * 1784 * May modify @p ssid, @p devno and / or @p schid even if no free 1785 * subchannel / device number could be found. 1786 */ 1787 static bool css_find_free_subch_and_devno(uint8_t cssid, uint8_t *ssid, 1788 uint16_t *devno, uint16_t *schid, 1789 Error **errp) 1790 { 1791 uint32_t free_schid, free_devno; 1792 1793 assert(ssid && devno && schid); 1794 for (*ssid = 0; *ssid <= MAX_SSID; (*ssid)++) { 1795 free_schid = css_find_free_subch(cssid, *ssid); 1796 if (free_schid > MAX_SCHID) { 1797 continue; 1798 } 1799 free_devno = css_find_free_devno(cssid, *ssid, free_schid); 1800 if (free_devno > MAX_DEVNO) { 1801 continue; 1802 } 1803 *schid = free_schid; 1804 *devno = free_devno; 1805 return true; 1806 } 1807 error_setg(errp, "Virtual channel subsystem is full!"); 1808 return false; 1809 } 1810 1811 bool css_subch_visible(SubchDev *sch) 1812 { 1813 if (sch->ssid > channel_subsys.max_ssid) { 1814 return false; 1815 } 1816 1817 if (sch->cssid != channel_subsys.default_cssid) { 1818 return (channel_subsys.max_cssid > 0); 1819 } 1820 1821 return true; 1822 } 1823 1824 bool css_present(uint8_t cssid) 1825 { 1826 return (channel_subsys.css[cssid] != NULL); 1827 } 1828 1829 bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno) 1830 { 1831 if (!channel_subsys.css[cssid]) { 1832 return false; 1833 } 1834 if (!channel_subsys.css[cssid]->sch_set[ssid]) { 1835 return false; 1836 } 1837 1838 return !!test_bit(devno, 1839 channel_subsys.css[cssid]->sch_set[ssid]->devnos_used); 1840 } 1841 1842 void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid, 1843 uint16_t devno, SubchDev *sch) 1844 { 1845 CssImage *css; 1846 SubchSet *s_set; 1847 1848 trace_css_assign_subch(sch ? "assign" : "deassign", cssid, ssid, schid, 1849 devno); 1850 if (!channel_subsys.css[cssid]) { 1851 fprintf(stderr, 1852 "Suspicious call to %s (%x.%x.%04x) for non-existing css!\n", 1853 __func__, cssid, ssid, schid); 1854 return; 1855 } 1856 css = channel_subsys.css[cssid]; 1857 1858 if (!css->sch_set[ssid]) { 1859 css->sch_set[ssid] = g_malloc0(sizeof(SubchSet)); 1860 } 1861 s_set = css->sch_set[ssid]; 1862 1863 s_set->sch[schid] = sch; 1864 if (sch) { 1865 set_bit(schid, s_set->schids_used); 1866 set_bit(devno, s_set->devnos_used); 1867 } else { 1868 clear_bit(schid, s_set->schids_used); 1869 clear_bit(devno, s_set->devnos_used); 1870 } 1871 } 1872 1873 void css_queue_crw(uint8_t rsc, uint8_t erc, int chain, uint16_t rsid) 1874 { 1875 CrwContainer *crw_cont; 1876 1877 trace_css_crw(rsc, erc, rsid, chain ? "(chained)" : ""); 1878 /* TODO: Maybe use a static crw pool? */ 1879 crw_cont = g_try_malloc0(sizeof(CrwContainer)); 1880 if (!crw_cont) { 1881 channel_subsys.crws_lost = true; 1882 return; 1883 } 1884 crw_cont->crw.flags = (rsc << 8) | erc; 1885 if (chain) { 1886 crw_cont->crw.flags |= CRW_FLAGS_MASK_C; 1887 } 1888 crw_cont->crw.rsid = rsid; 1889 if (channel_subsys.crws_lost) { 1890 crw_cont->crw.flags |= CRW_FLAGS_MASK_R; 1891 channel_subsys.crws_lost = false; 1892 } 1893 1894 QTAILQ_INSERT_TAIL(&channel_subsys.pending_crws, crw_cont, sibling); 1895 1896 if (channel_subsys.do_crw_mchk) { 1897 channel_subsys.do_crw_mchk = false; 1898 /* Inject crw pending machine check. */ 1899 s390_crw_mchk(); 1900 } 1901 } 1902 1903 void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid, 1904 int hotplugged, int add) 1905 { 1906 uint8_t guest_cssid; 1907 bool chain_crw; 1908 1909 if (add && !hotplugged) { 1910 return; 1911 } 1912 if (channel_subsys.max_cssid == 0) { 1913 /* Default cssid shows up as 0. */ 1914 guest_cssid = (cssid == channel_subsys.default_cssid) ? 0 : cssid; 1915 } else { 1916 /* Show real cssid to the guest. */ 1917 guest_cssid = cssid; 1918 } 1919 /* 1920 * Only notify for higher subchannel sets/channel subsystems if the 1921 * guest has enabled it. 1922 */ 1923 if ((ssid > channel_subsys.max_ssid) || 1924 (guest_cssid > channel_subsys.max_cssid) || 1925 ((channel_subsys.max_cssid == 0) && 1926 (cssid != channel_subsys.default_cssid))) { 1927 return; 1928 } 1929 chain_crw = (channel_subsys.max_ssid > 0) || 1930 (channel_subsys.max_cssid > 0); 1931 css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, chain_crw ? 1 : 0, schid); 1932 if (chain_crw) { 1933 css_queue_crw(CRW_RSC_SUBCH, CRW_ERC_IPI, 0, 1934 (guest_cssid << 8) | (ssid << 4)); 1935 } 1936 /* RW_ERC_IPI --> clear pending interrupts */ 1937 css_clear_io_interrupt(css_do_build_subchannel_id(cssid, ssid), schid); 1938 } 1939 1940 void css_generate_chp_crws(uint8_t cssid, uint8_t chpid) 1941 { 1942 /* TODO */ 1943 } 1944 1945 void css_generate_css_crws(uint8_t cssid) 1946 { 1947 if (!channel_subsys.sei_pending) { 1948 css_queue_crw(CRW_RSC_CSS, 0, 0, cssid); 1949 } 1950 channel_subsys.sei_pending = true; 1951 } 1952 1953 void css_clear_sei_pending(void) 1954 { 1955 channel_subsys.sei_pending = false; 1956 } 1957 1958 int css_enable_mcsse(void) 1959 { 1960 trace_css_enable_facility("mcsse"); 1961 channel_subsys.max_cssid = MAX_CSSID; 1962 return 0; 1963 } 1964 1965 int css_enable_mss(void) 1966 { 1967 trace_css_enable_facility("mss"); 1968 channel_subsys.max_ssid = MAX_SSID; 1969 return 0; 1970 } 1971 1972 void css_reset_sch(SubchDev *sch) 1973 { 1974 PMCW *p = &sch->curr_status.pmcw; 1975 1976 if ((p->flags & PMCW_FLAGS_MASK_ENA) != 0 && sch->disable_cb) { 1977 sch->disable_cb(sch); 1978 } 1979 1980 p->intparm = 0; 1981 p->flags &= ~(PMCW_FLAGS_MASK_ISC | PMCW_FLAGS_MASK_ENA | 1982 PMCW_FLAGS_MASK_LM | PMCW_FLAGS_MASK_MME | 1983 PMCW_FLAGS_MASK_MP | PMCW_FLAGS_MASK_TF); 1984 p->flags |= PMCW_FLAGS_MASK_DNV; 1985 p->devno = sch->devno; 1986 p->pim = 0x80; 1987 p->lpm = p->pim; 1988 p->pnom = 0; 1989 p->lpum = 0; 1990 p->mbi = 0; 1991 p->pom = 0xff; 1992 p->pam = 0x80; 1993 p->chars &= ~(PMCW_CHARS_MASK_MBFC | PMCW_CHARS_MASK_XMWME | 1994 PMCW_CHARS_MASK_CSENSE); 1995 1996 memset(&sch->curr_status.scsw, 0, sizeof(sch->curr_status.scsw)); 1997 sch->curr_status.mba = 0; 1998 1999 sch->channel_prog = 0x0; 2000 sch->last_cmd_valid = false; 2001 sch->thinint_active = false; 2002 } 2003 2004 void css_reset(void) 2005 { 2006 CrwContainer *crw_cont; 2007 2008 /* Clean up monitoring. */ 2009 channel_subsys.chnmon_active = false; 2010 channel_subsys.chnmon_area = 0; 2011 2012 /* Clear pending CRWs. */ 2013 while ((crw_cont = QTAILQ_FIRST(&channel_subsys.pending_crws))) { 2014 QTAILQ_REMOVE(&channel_subsys.pending_crws, crw_cont, sibling); 2015 g_free(crw_cont); 2016 } 2017 channel_subsys.sei_pending = false; 2018 channel_subsys.do_crw_mchk = true; 2019 channel_subsys.crws_lost = false; 2020 2021 /* Reset maximum ids. */ 2022 channel_subsys.max_cssid = 0; 2023 channel_subsys.max_ssid = 0; 2024 } 2025 2026 static void get_css_devid(Object *obj, Visitor *v, const char *name, 2027 void *opaque, Error **errp) 2028 { 2029 DeviceState *dev = DEVICE(obj); 2030 Property *prop = opaque; 2031 CssDevId *dev_id = qdev_get_prop_ptr(dev, prop); 2032 char buffer[] = "xx.x.xxxx"; 2033 char *p = buffer; 2034 int r; 2035 2036 if (dev_id->valid) { 2037 2038 r = snprintf(buffer, sizeof(buffer), "%02x.%1x.%04x", dev_id->cssid, 2039 dev_id->ssid, dev_id->devid); 2040 assert(r == sizeof(buffer) - 1); 2041 2042 /* drop leading zero */ 2043 if (dev_id->cssid <= 0xf) { 2044 p++; 2045 } 2046 } else { 2047 snprintf(buffer, sizeof(buffer), "<unset>"); 2048 } 2049 2050 visit_type_str(v, name, &p, errp); 2051 } 2052 2053 /* 2054 * parse <cssid>.<ssid>.<devid> and assert valid range for cssid/ssid 2055 */ 2056 static void set_css_devid(Object *obj, Visitor *v, const char *name, 2057 void *opaque, Error **errp) 2058 { 2059 DeviceState *dev = DEVICE(obj); 2060 Property *prop = opaque; 2061 CssDevId *dev_id = qdev_get_prop_ptr(dev, prop); 2062 Error *local_err = NULL; 2063 char *str; 2064 int num, n1, n2; 2065 unsigned int cssid, ssid, devid; 2066 2067 if (dev->realized) { 2068 qdev_prop_set_after_realize(dev, name, errp); 2069 return; 2070 } 2071 2072 visit_type_str(v, name, &str, &local_err); 2073 if (local_err) { 2074 error_propagate(errp, local_err); 2075 return; 2076 } 2077 2078 num = sscanf(str, "%2x.%1x%n.%4x%n", &cssid, &ssid, &n1, &devid, &n2); 2079 if (num != 3 || (n2 - n1) != 5 || strlen(str) != n2) { 2080 error_set_from_qdev_prop_error(errp, EINVAL, dev, prop, str); 2081 goto out; 2082 } 2083 if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) { 2084 error_setg(errp, "Invalid cssid or ssid: cssid %x, ssid %x", 2085 cssid, ssid); 2086 goto out; 2087 } 2088 2089 dev_id->cssid = cssid; 2090 dev_id->ssid = ssid; 2091 dev_id->devid = devid; 2092 dev_id->valid = true; 2093 2094 out: 2095 g_free(str); 2096 } 2097 2098 PropertyInfo css_devid_propinfo = { 2099 .name = "str", 2100 .description = "Identifier of an I/O device in the channel " 2101 "subsystem, example: fe.1.23ab", 2102 .get = get_css_devid, 2103 .set = set_css_devid, 2104 }; 2105 2106 PropertyInfo css_devid_ro_propinfo = { 2107 .name = "str", 2108 .description = "Read-only identifier of an I/O device in the channel " 2109 "subsystem, example: fe.1.23ab", 2110 .get = get_css_devid, 2111 }; 2112 2113 SubchDev *css_create_sch(CssDevId bus_id, bool is_virtual, bool squash_mcss, 2114 Error **errp) 2115 { 2116 uint16_t schid = 0; 2117 SubchDev *sch; 2118 2119 if (bus_id.valid) { 2120 if (is_virtual != (bus_id.cssid == VIRTUAL_CSSID)) { 2121 error_setg(errp, "cssid %hhx not valid for %s devices", 2122 bus_id.cssid, 2123 (is_virtual ? "virtual" : "non-virtual")); 2124 return NULL; 2125 } 2126 } 2127 2128 if (bus_id.valid) { 2129 if (squash_mcss) { 2130 bus_id.cssid = channel_subsys.default_cssid; 2131 } else if (!channel_subsys.css[bus_id.cssid]) { 2132 css_create_css_image(bus_id.cssid, false); 2133 } 2134 2135 if (!css_find_free_subch_for_devno(bus_id.cssid, bus_id.ssid, 2136 bus_id.devid, &schid, errp)) { 2137 return NULL; 2138 } 2139 } else if (squash_mcss || is_virtual) { 2140 bus_id.cssid = channel_subsys.default_cssid; 2141 2142 if (!css_find_free_subch_and_devno(bus_id.cssid, &bus_id.ssid, 2143 &bus_id.devid, &schid, errp)) { 2144 return NULL; 2145 } 2146 } else { 2147 for (bus_id.cssid = 0; bus_id.cssid < MAX_CSSID; ++bus_id.cssid) { 2148 if (bus_id.cssid == VIRTUAL_CSSID) { 2149 continue; 2150 } 2151 2152 if (!channel_subsys.css[bus_id.cssid]) { 2153 css_create_css_image(bus_id.cssid, false); 2154 } 2155 2156 if (css_find_free_subch_and_devno(bus_id.cssid, &bus_id.ssid, 2157 &bus_id.devid, &schid, 2158 NULL)) { 2159 break; 2160 } 2161 if (bus_id.cssid == MAX_CSSID) { 2162 error_setg(errp, "Virtual channel subsystem is full!"); 2163 return NULL; 2164 } 2165 } 2166 } 2167 2168 sch = g_malloc0(sizeof(*sch)); 2169 sch->cssid = bus_id.cssid; 2170 sch->ssid = bus_id.ssid; 2171 sch->devno = bus_id.devid; 2172 sch->schid = schid; 2173 css_subch_assign(sch->cssid, sch->ssid, schid, sch->devno, sch); 2174 return sch; 2175 } 2176 2177 static int css_sch_get_chpids(SubchDev *sch, CssDevId *dev_id) 2178 { 2179 char *fid_path; 2180 FILE *fd; 2181 uint32_t chpid[8]; 2182 int i; 2183 PMCW *p = &sch->curr_status.pmcw; 2184 2185 fid_path = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/chpids", 2186 dev_id->cssid, dev_id->ssid, dev_id->devid); 2187 fd = fopen(fid_path, "r"); 2188 if (fd == NULL) { 2189 error_report("%s: open %s failed", __func__, fid_path); 2190 g_free(fid_path); 2191 return -EINVAL; 2192 } 2193 2194 if (fscanf(fd, "%x %x %x %x %x %x %x %x", 2195 &chpid[0], &chpid[1], &chpid[2], &chpid[3], 2196 &chpid[4], &chpid[5], &chpid[6], &chpid[7]) != 8) { 2197 fclose(fd); 2198 g_free(fid_path); 2199 return -EINVAL; 2200 } 2201 2202 for (i = 0; i < ARRAY_SIZE(p->chpid); i++) { 2203 p->chpid[i] = chpid[i]; 2204 } 2205 2206 fclose(fd); 2207 g_free(fid_path); 2208 2209 return 0; 2210 } 2211 2212 static int css_sch_get_path_masks(SubchDev *sch, CssDevId *dev_id) 2213 { 2214 char *fid_path; 2215 FILE *fd; 2216 uint32_t pim, pam, pom; 2217 PMCW *p = &sch->curr_status.pmcw; 2218 2219 fid_path = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/pimpampom", 2220 dev_id->cssid, dev_id->ssid, dev_id->devid); 2221 fd = fopen(fid_path, "r"); 2222 if (fd == NULL) { 2223 error_report("%s: open %s failed", __func__, fid_path); 2224 g_free(fid_path); 2225 return -EINVAL; 2226 } 2227 2228 if (fscanf(fd, "%x %x %x", &pim, &pam, &pom) != 3) { 2229 fclose(fd); 2230 g_free(fid_path); 2231 return -EINVAL; 2232 } 2233 2234 p->pim = pim; 2235 p->pam = pam; 2236 p->pom = pom; 2237 fclose(fd); 2238 g_free(fid_path); 2239 2240 return 0; 2241 } 2242 2243 static int css_sch_get_chpid_type(uint8_t chpid, uint32_t *type, 2244 CssDevId *dev_id) 2245 { 2246 char *fid_path; 2247 FILE *fd; 2248 2249 fid_path = g_strdup_printf("/sys/devices/css%x/chp0.%02x/type", 2250 dev_id->cssid, chpid); 2251 fd = fopen(fid_path, "r"); 2252 if (fd == NULL) { 2253 error_report("%s: open %s failed", __func__, fid_path); 2254 g_free(fid_path); 2255 return -EINVAL; 2256 } 2257 2258 if (fscanf(fd, "%x", type) != 1) { 2259 fclose(fd); 2260 g_free(fid_path); 2261 return -EINVAL; 2262 } 2263 2264 fclose(fd); 2265 g_free(fid_path); 2266 2267 return 0; 2268 } 2269 2270 /* 2271 * We currently retrieve the real device information from sysfs to build the 2272 * guest subchannel information block without considering the migration feature. 2273 * We need to revisit this problem when we want to add migration support. 2274 */ 2275 int css_sch_build_schib(SubchDev *sch, CssDevId *dev_id) 2276 { 2277 CssImage *css = channel_subsys.css[sch->cssid]; 2278 PMCW *p = &sch->curr_status.pmcw; 2279 SCSW *s = &sch->curr_status.scsw; 2280 uint32_t type; 2281 int i, ret; 2282 2283 assert(css != NULL); 2284 memset(p, 0, sizeof(PMCW)); 2285 p->flags |= PMCW_FLAGS_MASK_DNV; 2286 /* We are dealing with I/O subchannels only. */ 2287 p->devno = sch->devno; 2288 2289 /* Grab path mask from sysfs. */ 2290 ret = css_sch_get_path_masks(sch, dev_id); 2291 if (ret) { 2292 return ret; 2293 } 2294 2295 /* Grab chpids from sysfs. */ 2296 ret = css_sch_get_chpids(sch, dev_id); 2297 if (ret) { 2298 return ret; 2299 } 2300 2301 /* Build chpid type. */ 2302 for (i = 0; i < ARRAY_SIZE(p->chpid); i++) { 2303 if (p->chpid[i] && !css->chpids[p->chpid[i]].in_use) { 2304 ret = css_sch_get_chpid_type(p->chpid[i], &type, dev_id); 2305 if (ret) { 2306 return ret; 2307 } 2308 css_add_chpid(sch->cssid, p->chpid[i], type, false); 2309 } 2310 } 2311 2312 memset(s, 0, sizeof(SCSW)); 2313 sch->curr_status.mba = 0; 2314 for (i = 0; i < ARRAY_SIZE(sch->curr_status.mda); i++) { 2315 sch->curr_status.mda[i] = 0; 2316 } 2317 2318 return 0; 2319 } 2320