1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 1999, 2010 4 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) 5 * Arnd Bergmann (arndb@de.ibm.com) 6 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> 7 */ 8 9 #include <linux/bug.h> 10 #include <linux/workqueue.h> 11 #include <linux/spinlock.h> 12 #include <linux/export.h> 13 #include <linux/sched.h> 14 #include <linux/init.h> 15 #include <linux/jiffies.h> 16 #include <linux/wait.h> 17 #include <linux/mutex.h> 18 #include <linux/errno.h> 19 #include <linux/slab.h> 20 #include <asm/chpid.h> 21 #include <asm/sclp.h> 22 #include <asm/crw.h> 23 24 #include "cio.h" 25 #include "css.h" 26 #include "ioasm.h" 27 #include "cio_debug.h" 28 #include "chp.h" 29 30 #define to_channelpath(device) container_of(device, struct channel_path, dev) 31 #define CHP_INFO_UPDATE_INTERVAL 1*HZ 32 33 enum cfg_task_t { 34 cfg_none, 35 cfg_configure, 36 cfg_deconfigure 37 }; 38 39 /* Map for pending configure tasks. */ 40 static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; 41 static DEFINE_SPINLOCK(cfg_lock); 42 43 /* Map for channel-path status. */ 44 static struct sclp_chp_info chp_info; 45 static DEFINE_MUTEX(info_lock); 46 47 /* Time after which channel-path status may be outdated. */ 48 static unsigned long chp_info_expires; 49 50 static struct work_struct cfg_work; 51 52 /* Wait queue for configure completion events. */ 53 static wait_queue_head_t cfg_wait_queue; 54 55 /* Set vary state for given chpid. */ 56 static void set_chp_logically_online(struct chp_id chpid, int onoff) 57 { 58 chpid_to_chp(chpid)->state = onoff; 59 } 60 61 /* On success return 0 if channel-path is varied offline, 1 if it is varied 62 * online. Return -ENODEV if channel-path is not registered. */ 63 int chp_get_status(struct chp_id chpid) 64 { 65 return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); 66 } 67 68 /** 69 * chp_get_sch_opm - return opm for subchannel 70 * @sch: subchannel 71 * 72 * Calculate and return the operational path mask (opm) based on the chpids 73 * used by the subchannel and the status of the associated channel-paths. 74 */ 75 u8 chp_get_sch_opm(struct subchannel *sch) 76 { 77 struct chp_id chpid; 78 int opm; 79 int i; 80 81 opm = 0; 82 chp_id_init(&chpid); 83 for (i = 0; i < 8; i++) { 84 opm <<= 1; 85 chpid.id = sch->schib.pmcw.chpid[i]; 86 if (chp_get_status(chpid) != 0) 87 opm |= 1; 88 } 89 return opm; 90 } 91 EXPORT_SYMBOL_GPL(chp_get_sch_opm); 92 93 /** 94 * chp_is_registered - check if a channel-path is registered 95 * @chpid: channel-path ID 96 * 97 * Return non-zero if a channel-path with the given chpid is registered, 98 * zero otherwise. 99 */ 100 int chp_is_registered(struct chp_id chpid) 101 { 102 return chpid_to_chp(chpid) != NULL; 103 } 104 105 /* 106 * Function: s390_vary_chpid 107 * Varies the specified chpid online or offline 108 */ 109 static int s390_vary_chpid(struct chp_id chpid, int on) 110 { 111 char dbf_text[15]; 112 int status; 113 114 sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, 115 chpid.id); 116 CIO_TRACE_EVENT(2, dbf_text); 117 118 status = chp_get_status(chpid); 119 if (!on && !status) 120 return 0; 121 122 set_chp_logically_online(chpid, on); 123 chsc_chp_vary(chpid, on); 124 return 0; 125 } 126 127 /* 128 * Channel measurement related functions 129 */ 130 static ssize_t chp_measurement_chars_read(struct file *filp, 131 struct kobject *kobj, 132 struct bin_attribute *bin_attr, 133 char *buf, loff_t off, size_t count) 134 { 135 struct channel_path *chp; 136 struct device *device; 137 138 device = kobj_to_dev(kobj); 139 chp = to_channelpath(device); 140 if (chp->cmg == -1) 141 return 0; 142 143 return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, 144 sizeof(chp->cmg_chars)); 145 } 146 147 static const struct bin_attribute chp_measurement_chars_attr = { 148 .attr = { 149 .name = "measurement_chars", 150 .mode = S_IRUSR, 151 }, 152 .size = sizeof(struct cmg_chars), 153 .read = chp_measurement_chars_read, 154 }; 155 156 static void chp_measurement_copy_block(struct cmg_entry *buf, 157 struct channel_subsystem *css, 158 struct chp_id chpid) 159 { 160 void *area; 161 struct cmg_entry *entry, reference_buf; 162 int idx; 163 164 if (chpid.id < 128) { 165 area = css->cub_addr1; 166 idx = chpid.id; 167 } else { 168 area = css->cub_addr2; 169 idx = chpid.id - 128; 170 } 171 entry = area + (idx * sizeof(struct cmg_entry)); 172 do { 173 memcpy(buf, entry, sizeof(*entry)); 174 memcpy(&reference_buf, entry, sizeof(*entry)); 175 } while (reference_buf.values[0] != buf->values[0]); 176 } 177 178 static ssize_t chp_measurement_read(struct file *filp, struct kobject *kobj, 179 struct bin_attribute *bin_attr, 180 char *buf, loff_t off, size_t count) 181 { 182 struct channel_path *chp; 183 struct channel_subsystem *css; 184 struct device *device; 185 unsigned int size; 186 187 device = kobj_to_dev(kobj); 188 chp = to_channelpath(device); 189 css = to_css(chp->dev.parent); 190 191 size = sizeof(struct cmg_entry); 192 193 /* Only allow single reads. */ 194 if (off || count < size) 195 return 0; 196 chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); 197 count = size; 198 return count; 199 } 200 201 static const struct bin_attribute chp_measurement_attr = { 202 .attr = { 203 .name = "measurement", 204 .mode = S_IRUSR, 205 }, 206 .size = sizeof(struct cmg_entry), 207 .read = chp_measurement_read, 208 }; 209 210 void chp_remove_cmg_attr(struct channel_path *chp) 211 { 212 device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); 213 device_remove_bin_file(&chp->dev, &chp_measurement_attr); 214 } 215 216 int chp_add_cmg_attr(struct channel_path *chp) 217 { 218 int ret; 219 220 ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); 221 if (ret) 222 return ret; 223 ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); 224 if (ret) 225 device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); 226 return ret; 227 } 228 229 /* 230 * Files for the channel path entries. 231 */ 232 static ssize_t chp_status_show(struct device *dev, 233 struct device_attribute *attr, char *buf) 234 { 235 struct channel_path *chp = to_channelpath(dev); 236 int status; 237 238 mutex_lock(&chp->lock); 239 status = chp->state; 240 mutex_unlock(&chp->lock); 241 242 return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); 243 } 244 245 static ssize_t chp_status_write(struct device *dev, 246 struct device_attribute *attr, 247 const char *buf, size_t count) 248 { 249 struct channel_path *cp = to_channelpath(dev); 250 char cmd[10]; 251 int num_args; 252 int error; 253 254 num_args = sscanf(buf, "%5s", cmd); 255 if (!num_args) 256 return count; 257 258 if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { 259 mutex_lock(&cp->lock); 260 error = s390_vary_chpid(cp->chpid, 1); 261 mutex_unlock(&cp->lock); 262 } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { 263 mutex_lock(&cp->lock); 264 error = s390_vary_chpid(cp->chpid, 0); 265 mutex_unlock(&cp->lock); 266 } else 267 error = -EINVAL; 268 269 return error < 0 ? error : count; 270 } 271 272 static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); 273 274 static ssize_t chp_configure_show(struct device *dev, 275 struct device_attribute *attr, char *buf) 276 { 277 struct channel_path *cp; 278 int status; 279 280 cp = to_channelpath(dev); 281 status = chp_info_get_status(cp->chpid); 282 if (status < 0) 283 return status; 284 285 return snprintf(buf, PAGE_SIZE, "%d\n", status); 286 } 287 288 static int cfg_wait_idle(void); 289 290 static ssize_t chp_configure_write(struct device *dev, 291 struct device_attribute *attr, 292 const char *buf, size_t count) 293 { 294 struct channel_path *cp; 295 int val; 296 char delim; 297 298 if (sscanf(buf, "%d %c", &val, &delim) != 1) 299 return -EINVAL; 300 if (val != 0 && val != 1) 301 return -EINVAL; 302 cp = to_channelpath(dev); 303 chp_cfg_schedule(cp->chpid, val); 304 cfg_wait_idle(); 305 306 return count; 307 } 308 309 static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); 310 311 static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, 312 char *buf) 313 { 314 struct channel_path *chp = to_channelpath(dev); 315 u8 type; 316 317 mutex_lock(&chp->lock); 318 type = chp->desc.desc; 319 mutex_unlock(&chp->lock); 320 return sprintf(buf, "%x\n", type); 321 } 322 323 static DEVICE_ATTR(type, 0444, chp_type_show, NULL); 324 325 static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, 326 char *buf) 327 { 328 struct channel_path *chp = to_channelpath(dev); 329 330 if (!chp) 331 return 0; 332 if (chp->cmg == -1) /* channel measurements not available */ 333 return sprintf(buf, "unknown\n"); 334 return sprintf(buf, "%x\n", chp->cmg); 335 } 336 337 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); 338 339 static ssize_t chp_shared_show(struct device *dev, 340 struct device_attribute *attr, char *buf) 341 { 342 struct channel_path *chp = to_channelpath(dev); 343 344 if (!chp) 345 return 0; 346 if (chp->shared == -1) /* channel measurements not available */ 347 return sprintf(buf, "unknown\n"); 348 return sprintf(buf, "%x\n", chp->shared); 349 } 350 351 static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); 352 353 static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, 354 char *buf) 355 { 356 struct channel_path *chp = to_channelpath(dev); 357 ssize_t rc; 358 359 mutex_lock(&chp->lock); 360 if (chp->desc_fmt1.flags & 0x10) 361 rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); 362 else 363 rc = 0; 364 mutex_unlock(&chp->lock); 365 366 return rc; 367 } 368 static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); 369 370 static ssize_t chp_chid_external_show(struct device *dev, 371 struct device_attribute *attr, char *buf) 372 { 373 struct channel_path *chp = to_channelpath(dev); 374 ssize_t rc; 375 376 mutex_lock(&chp->lock); 377 if (chp->desc_fmt1.flags & 0x10) 378 rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); 379 else 380 rc = 0; 381 mutex_unlock(&chp->lock); 382 383 return rc; 384 } 385 static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); 386 387 static ssize_t util_string_read(struct file *filp, struct kobject *kobj, 388 struct bin_attribute *attr, char *buf, 389 loff_t off, size_t count) 390 { 391 struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); 392 ssize_t rc; 393 394 mutex_lock(&chp->lock); 395 rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, 396 sizeof(chp->desc_fmt3.util_str)); 397 mutex_unlock(&chp->lock); 398 399 return rc; 400 } 401 static BIN_ATTR_RO(util_string, 402 sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); 403 404 static struct bin_attribute *chp_bin_attrs[] = { 405 &bin_attr_util_string, 406 NULL, 407 }; 408 409 static struct attribute *chp_attrs[] = { 410 &dev_attr_status.attr, 411 &dev_attr_configure.attr, 412 &dev_attr_type.attr, 413 &dev_attr_cmg.attr, 414 &dev_attr_shared.attr, 415 &dev_attr_chid.attr, 416 &dev_attr_chid_external.attr, 417 NULL, 418 }; 419 static struct attribute_group chp_attr_group = { 420 .attrs = chp_attrs, 421 .bin_attrs = chp_bin_attrs, 422 }; 423 static const struct attribute_group *chp_attr_groups[] = { 424 &chp_attr_group, 425 NULL, 426 }; 427 428 static void chp_release(struct device *dev) 429 { 430 struct channel_path *cp; 431 432 cp = to_channelpath(dev); 433 kfree(cp); 434 } 435 436 /** 437 * chp_update_desc - update channel-path description 438 * @chp: channel-path 439 * 440 * Update the channel-path description of the specified channel-path 441 * including channel measurement related information. 442 * Return zero on success, non-zero otherwise. 443 */ 444 int chp_update_desc(struct channel_path *chp) 445 { 446 int rc; 447 448 rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); 449 if (rc) 450 return rc; 451 452 /* 453 * Fetching the following data is optional. Not all machines or 454 * hypervisors implement the required chsc commands. 455 */ 456 chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); 457 chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); 458 chsc_get_channel_measurement_chars(chp); 459 460 return 0; 461 } 462 463 /** 464 * chp_new - register a new channel-path 465 * @chpid: channel-path ID 466 * 467 * Create and register data structure representing new channel-path. Return 468 * zero on success, non-zero otherwise. 469 */ 470 int chp_new(struct chp_id chpid) 471 { 472 struct channel_subsystem *css = css_by_id(chpid.cssid); 473 struct channel_path *chp; 474 int ret = 0; 475 476 mutex_lock(&css->mutex); 477 if (chp_is_registered(chpid)) 478 goto out; 479 480 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); 481 if (!chp) { 482 ret = -ENOMEM; 483 goto out; 484 } 485 /* fill in status, etc. */ 486 chp->chpid = chpid; 487 chp->state = 1; 488 chp->dev.parent = &css->device; 489 chp->dev.groups = chp_attr_groups; 490 chp->dev.release = chp_release; 491 mutex_init(&chp->lock); 492 493 /* Obtain channel path description and fill it in. */ 494 ret = chp_update_desc(chp); 495 if (ret) 496 goto out_free; 497 if ((chp->desc.flags & 0x80) == 0) { 498 ret = -ENODEV; 499 goto out_free; 500 } 501 dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); 502 503 /* make it known to the system */ 504 ret = device_register(&chp->dev); 505 if (ret) { 506 CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", 507 chpid.cssid, chpid.id, ret); 508 put_device(&chp->dev); 509 goto out; 510 } 511 512 if (css->cm_enabled) { 513 ret = chp_add_cmg_attr(chp); 514 if (ret) { 515 device_unregister(&chp->dev); 516 goto out; 517 } 518 } 519 css->chps[chpid.id] = chp; 520 goto out; 521 out_free: 522 kfree(chp); 523 out: 524 mutex_unlock(&css->mutex); 525 return ret; 526 } 527 528 /** 529 * chp_get_chp_desc - return newly allocated channel-path description 530 * @chpid: channel-path ID 531 * 532 * On success return a newly allocated copy of the channel-path description 533 * data associated with the given channel-path ID. Return %NULL on error. 534 */ 535 struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) 536 { 537 struct channel_path *chp; 538 struct channel_path_desc_fmt0 *desc; 539 540 chp = chpid_to_chp(chpid); 541 if (!chp) 542 return NULL; 543 desc = kmalloc(sizeof(*desc), GFP_KERNEL); 544 if (!desc) 545 return NULL; 546 547 mutex_lock(&chp->lock); 548 memcpy(desc, &chp->desc, sizeof(*desc)); 549 mutex_unlock(&chp->lock); 550 return desc; 551 } 552 553 /** 554 * chp_process_crw - process channel-path status change 555 * @crw0: channel report-word to handler 556 * @crw1: second channel-report word (always NULL) 557 * @overflow: crw overflow indication 558 * 559 * Handle channel-report-words indicating that the status of a channel-path 560 * has changed. 561 */ 562 static void chp_process_crw(struct crw *crw0, struct crw *crw1, 563 int overflow) 564 { 565 struct chp_id chpid; 566 567 if (overflow) { 568 css_schedule_eval_all(); 569 return; 570 } 571 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " 572 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", 573 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, 574 crw0->erc, crw0->rsid); 575 /* 576 * Check for solicited machine checks. These are 577 * created by reset channel path and need not be 578 * handled here. 579 */ 580 if (crw0->slct) { 581 CIO_CRW_EVENT(2, "solicited machine check for " 582 "channel path %02X\n", crw0->rsid); 583 return; 584 } 585 chp_id_init(&chpid); 586 chpid.id = crw0->rsid; 587 switch (crw0->erc) { 588 case CRW_ERC_IPARM: /* Path has come. */ 589 case CRW_ERC_INIT: 590 chp_new(chpid); 591 chsc_chp_online(chpid); 592 break; 593 case CRW_ERC_PERRI: /* Path has gone. */ 594 case CRW_ERC_PERRN: 595 chsc_chp_offline(chpid); 596 break; 597 default: 598 CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", 599 crw0->erc); 600 } 601 } 602 603 int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) 604 { 605 int i; 606 int mask; 607 608 for (i = 0; i < 8; i++) { 609 mask = 0x80 >> i; 610 if (!(ssd->path_mask & mask)) 611 continue; 612 if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) 613 continue; 614 if ((ssd->fla_valid_mask & mask) && 615 ((ssd->fla[i] & link->fla_mask) != link->fla)) 616 continue; 617 return mask; 618 } 619 return 0; 620 } 621 EXPORT_SYMBOL_GPL(chp_ssd_get_mask); 622 623 static inline int info_bit_num(struct chp_id id) 624 { 625 return id.id + id.cssid * (__MAX_CHPID + 1); 626 } 627 628 /* Force chp_info refresh on next call to info_validate(). */ 629 static void info_expire(void) 630 { 631 mutex_lock(&info_lock); 632 chp_info_expires = jiffies - 1; 633 mutex_unlock(&info_lock); 634 } 635 636 /* Ensure that chp_info is up-to-date. */ 637 static int info_update(void) 638 { 639 int rc; 640 641 mutex_lock(&info_lock); 642 rc = 0; 643 if (time_after(jiffies, chp_info_expires)) { 644 /* Data is too old, update. */ 645 rc = sclp_chp_read_info(&chp_info); 646 chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; 647 } 648 mutex_unlock(&info_lock); 649 650 return rc; 651 } 652 653 /** 654 * chp_info_get_status - retrieve configure status of a channel-path 655 * @chpid: channel-path ID 656 * 657 * On success, return 0 for standby, 1 for configured, 2 for reserved, 658 * 3 for not recognized. Return negative error code on error. 659 */ 660 int chp_info_get_status(struct chp_id chpid) 661 { 662 int rc; 663 int bit; 664 665 rc = info_update(); 666 if (rc) 667 return rc; 668 669 bit = info_bit_num(chpid); 670 mutex_lock(&info_lock); 671 if (!chp_test_bit(chp_info.recognized, bit)) 672 rc = CHP_STATUS_NOT_RECOGNIZED; 673 else if (chp_test_bit(chp_info.configured, bit)) 674 rc = CHP_STATUS_CONFIGURED; 675 else if (chp_test_bit(chp_info.standby, bit)) 676 rc = CHP_STATUS_STANDBY; 677 else 678 rc = CHP_STATUS_RESERVED; 679 mutex_unlock(&info_lock); 680 681 return rc; 682 } 683 684 /* Return configure task for chpid. */ 685 static enum cfg_task_t cfg_get_task(struct chp_id chpid) 686 { 687 return chp_cfg_task[chpid.cssid][chpid.id]; 688 } 689 690 /* Set configure task for chpid. */ 691 static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) 692 { 693 chp_cfg_task[chpid.cssid][chpid.id] = cfg; 694 } 695 696 /* Fetch the first configure task. Set chpid accordingly. */ 697 static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) 698 { 699 enum cfg_task_t t = cfg_none; 700 701 chp_id_for_each(chpid) { 702 t = cfg_get_task(*chpid); 703 if (t != cfg_none) 704 break; 705 } 706 707 return t; 708 } 709 710 /* Perform one configure/deconfigure request. Reschedule work function until 711 * last request. */ 712 static void cfg_func(struct work_struct *work) 713 { 714 struct chp_id chpid; 715 enum cfg_task_t t; 716 int rc; 717 718 spin_lock(&cfg_lock); 719 t = chp_cfg_fetch_task(&chpid); 720 spin_unlock(&cfg_lock); 721 722 switch (t) { 723 case cfg_configure: 724 rc = sclp_chp_configure(chpid); 725 if (rc) 726 CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" 727 "%d\n", chpid.cssid, chpid.id, rc); 728 else { 729 info_expire(); 730 chsc_chp_online(chpid); 731 } 732 break; 733 case cfg_deconfigure: 734 rc = sclp_chp_deconfigure(chpid); 735 if (rc) 736 CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" 737 "%d\n", chpid.cssid, chpid.id, rc); 738 else { 739 info_expire(); 740 chsc_chp_offline(chpid); 741 } 742 break; 743 case cfg_none: 744 /* Get updated information after last change. */ 745 info_update(); 746 wake_up_interruptible(&cfg_wait_queue); 747 return; 748 } 749 spin_lock(&cfg_lock); 750 if (t == cfg_get_task(chpid)) 751 cfg_set_task(chpid, cfg_none); 752 spin_unlock(&cfg_lock); 753 schedule_work(&cfg_work); 754 } 755 756 /** 757 * chp_cfg_schedule - schedule chpid configuration request 758 * @chpid: channel-path ID 759 * @configure: Non-zero for configure, zero for deconfigure 760 * 761 * Schedule a channel-path configuration/deconfiguration request. 762 */ 763 void chp_cfg_schedule(struct chp_id chpid, int configure) 764 { 765 CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, 766 configure); 767 spin_lock(&cfg_lock); 768 cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); 769 spin_unlock(&cfg_lock); 770 schedule_work(&cfg_work); 771 } 772 773 /** 774 * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request 775 * @chpid: channel-path ID 776 * 777 * Cancel an active channel-path deconfiguration request if it has not yet 778 * been performed. 779 */ 780 void chp_cfg_cancel_deconfigure(struct chp_id chpid) 781 { 782 CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); 783 spin_lock(&cfg_lock); 784 if (cfg_get_task(chpid) == cfg_deconfigure) 785 cfg_set_task(chpid, cfg_none); 786 spin_unlock(&cfg_lock); 787 } 788 789 static bool cfg_idle(void) 790 { 791 struct chp_id chpid; 792 enum cfg_task_t t; 793 794 spin_lock(&cfg_lock); 795 t = chp_cfg_fetch_task(&chpid); 796 spin_unlock(&cfg_lock); 797 798 return t == cfg_none; 799 } 800 801 static int cfg_wait_idle(void) 802 { 803 if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) 804 return -ERESTARTSYS; 805 return 0; 806 } 807 808 static int __init chp_init(void) 809 { 810 struct chp_id chpid; 811 int state, ret; 812 813 ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); 814 if (ret) 815 return ret; 816 INIT_WORK(&cfg_work, cfg_func); 817 init_waitqueue_head(&cfg_wait_queue); 818 if (info_update()) 819 return 0; 820 /* Register available channel-paths. */ 821 chp_id_for_each(&chpid) { 822 state = chp_info_get_status(chpid); 823 if (state == CHP_STATUS_CONFIGURED || 824 state == CHP_STATUS_STANDBY) 825 chp_new(chpid); 826 } 827 828 return 0; 829 } 830 831 subsys_initcall(chp_init); 832