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struct sclp_chp_info chp_info; 45 static DEFINE_MUTEX(info_lock); 46 47 /* Time after which channel-path status may be outdated.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 DECLARE_WAIT_QUEUE_HEAD(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 measurement_chars_read(struct file *filp, struct kobject *kobj, 131 struct bin_attribute *bin_attr, 132 char *buf, loff_t off, size_t count) 133 { 134 struct channel_path *chp; 135 struct device *device; 136 137 device = kobj_to_dev(kobj); 138 chp = to_channelpath(device); 139 if (chp->cmg == -1) 140 return 0; 141 142 return memory_read_from_buffer(buf, count, &off, &chp->cmg_chars, 143 sizeof(chp->cmg_chars)); 144 } 145 static BIN_ATTR_ADMIN_RO(measurement_chars, sizeof(struct cmg_chars)); 146 147 static ssize_t chp_measurement_copy_block(void *buf, loff_t off, size_t count, 148 struct kobject *kobj, bool extended) 149 { 150 struct channel_path *chp; 151 struct channel_subsystem *css; 152 struct device *device; 153 unsigned int size; 154 void *area, *entry; 155 int id, idx; 156 157 device = kobj_to_dev(kobj); 158 chp = to_channelpath(device); 159 css = to_css(chp->dev.parent); 160 id = chp->chpid.id; 161 162 if (extended) { 163 /* Check if extended measurement data is available. */ 164 if (!chp->extended) 165 return 0; 166 167 size = sizeof(struct cmg_ext_entry); 168 area = css->ecub[id / CSS_ECUES_PER_PAGE]; 169 idx = id % CSS_ECUES_PER_PAGE; 170 } else { 171 size = sizeof(struct cmg_entry); 172 area = css->cub[id / CSS_CUES_PER_PAGE]; 173 idx = id % CSS_CUES_PER_PAGE; 174 } 175 entry = area + (idx * size); 176 177 /* Only allow single reads. */ 178 if (off || count < size) 179 return 0; 180 181 memcpy(buf, entry, size); 182 183 return size; 184 } 185 186 static ssize_t measurement_read(struct file *filp, struct kobject *kobj, 187 struct bin_attribute *bin_attr, 188 char *buf, loff_t off, size_t count) 189 { 190 return chp_measurement_copy_block(buf, off, count, kobj, false); 191 } 192 static BIN_ATTR_ADMIN_RO(measurement, sizeof(struct cmg_entry)); 193 194 static ssize_t ext_measurement_read(struct file *filp, struct kobject *kobj, 195 struct bin_attribute *bin_attr, 196 char *buf, loff_t off, size_t count) 197 { 198 return chp_measurement_copy_block(buf, off, count, kobj, true); 199 } 200 static BIN_ATTR_ADMIN_RO(ext_measurement, sizeof(struct cmg_ext_entry)); 201 202 static struct bin_attribute *measurement_attrs[] = { 203 &bin_attr_measurement_chars, 204 &bin_attr_measurement, 205 &bin_attr_ext_measurement, 206 NULL, 207 }; 208 BIN_ATTRIBUTE_GROUPS(measurement); 209 210 void chp_remove_cmg_attr(struct channel_path *chp) 211 { 212 device_remove_groups(&chp->dev, measurement_groups); 213 } 214 215 int chp_add_cmg_attr(struct channel_path *chp) 216 { 217 return device_add_groups(&chp->dev, measurement_groups); 218 } 219 220 /* 221 * Files for the channel path entries. 222 */ 223 static ssize_t chp_status_show(struct device *dev, 224 struct device_attribute *attr, char *buf) 225 { 226 struct channel_path *chp = to_channelpath(dev); 227 int status; 228 229 mutex_lock(&chp->lock); 230 status = chp->state; 231 mutex_unlock(&chp->lock); 232 233 return status ? sprintf(buf, "online\n") : sprintf(buf, "offline\n"); 234 } 235 236 static ssize_t chp_status_write(struct device *dev, 237 struct device_attribute *attr, 238 const char *buf, size_t count) 239 { 240 struct channel_path *cp = to_channelpath(dev); 241 char cmd[10]; 242 int num_args; 243 int error; 244 245 num_args = sscanf(buf, "%5s", cmd); 246 if (!num_args) 247 return count; 248 249 /* Wait until previous actions have settled. */ 250 css_wait_for_slow_path(); 251 252 if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { 253 mutex_lock(&cp->lock); 254 error = s390_vary_chpid(cp->chpid, 1); 255 mutex_unlock(&cp->lock); 256 } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { 257 mutex_lock(&cp->lock); 258 error = s390_vary_chpid(cp->chpid, 0); 259 mutex_unlock(&cp->lock); 260 } else 261 error = -EINVAL; 262 263 return error < 0 ? error : count; 264 } 265 266 static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); 267 268 static ssize_t chp_configure_show(struct device *dev, 269 struct device_attribute *attr, char *buf) 270 { 271 struct channel_path *cp; 272 int status; 273 274 cp = to_channelpath(dev); 275 status = chp_info_get_status(cp->chpid); 276 if (status < 0) 277 return status; 278 279 return sysfs_emit(buf, "%d\n", status); 280 } 281 282 static int cfg_wait_idle(void); 283 284 static ssize_t chp_configure_write(struct device *dev, 285 struct device_attribute *attr, 286 const char *buf, size_t count) 287 { 288 struct channel_path *cp; 289 int val; 290 char delim; 291 292 if (sscanf(buf, "%d %c", &val, &delim) != 1) 293 return -EINVAL; 294 if (val != 0 && val != 1) 295 return -EINVAL; 296 cp = to_channelpath(dev); 297 chp_cfg_schedule(cp->chpid, val); 298 cfg_wait_idle(); 299 300 return count; 301 } 302 303 static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); 304 305 static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, 306 char *buf) 307 { 308 struct channel_path *chp = to_channelpath(dev); 309 u8 type; 310 311 mutex_lock(&chp->lock); 312 type = chp->desc.desc; 313 mutex_unlock(&chp->lock); 314 return sprintf(buf, "%x\n", type); 315 } 316 317 static DEVICE_ATTR(type, 0444, chp_type_show, NULL); 318 319 static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, 320 char *buf) 321 { 322 struct channel_path *chp = to_channelpath(dev); 323 324 if (!chp) 325 return 0; 326 if (chp->cmg == -1) /* channel measurements not available */ 327 return sprintf(buf, "unknown\n"); 328 return sprintf(buf, "%d\n", chp->cmg); 329 } 330 331 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); 332 333 static ssize_t chp_shared_show(struct device *dev, 334 struct device_attribute *attr, char *buf) 335 { 336 struct channel_path *chp = to_channelpath(dev); 337 338 if (!chp) 339 return 0; 340 if (chp->shared == -1) /* channel measurements not available */ 341 return sprintf(buf, "unknown\n"); 342 return sprintf(buf, "%x\n", chp->shared); 343 } 344 345 static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); 346 347 static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, 348 char *buf) 349 { 350 struct channel_path *chp = to_channelpath(dev); 351 ssize_t rc; 352 353 mutex_lock(&chp->lock); 354 if (chp->desc_fmt1.flags & 0x10) 355 rc = sprintf(buf, "%04x\n", chp->desc_fmt1.chid); 356 else 357 rc = 0; 358 mutex_unlock(&chp->lock); 359 360 return rc; 361 } 362 static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); 363 364 static ssize_t chp_chid_external_show(struct device *dev, 365 struct device_attribute *attr, char *buf) 366 { 367 struct channel_path *chp = to_channelpath(dev); 368 ssize_t rc; 369 370 mutex_lock(&chp->lock); 371 if (chp->desc_fmt1.flags & 0x10) 372 rc = sprintf(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); 373 else 374 rc = 0; 375 mutex_unlock(&chp->lock); 376 377 return rc; 378 } 379 static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); 380 381 static ssize_t chp_esc_show(struct device *dev, 382 struct device_attribute *attr, char *buf) 383 { 384 struct channel_path *chp = to_channelpath(dev); 385 ssize_t rc; 386 387 mutex_lock(&chp->lock); 388 rc = sprintf(buf, "%x\n", chp->desc_fmt1.esc); 389 mutex_unlock(&chp->lock); 390 391 return rc; 392 } 393 static DEVICE_ATTR(esc, 0444, chp_esc_show, NULL); 394 395 static char apply_max_suffix(unsigned long *value, unsigned long base) 396 { 397 static char suffixes[] = { 0, 'K', 'M', 'G', 'T' }; 398 int i; 399 400 for (i = 0; i < ARRAY_SIZE(suffixes) - 1; i++) { 401 if (*value < base || *value % base != 0) 402 break; 403 *value /= base; 404 } 405 406 return suffixes[i]; 407 } 408 409 static ssize_t speed_bps_show(struct device *dev, 410 struct device_attribute *attr, char *buf) 411 { 412 struct channel_path *chp = to_channelpath(dev); 413 unsigned long speed = chp->speed; 414 char suffix; 415 416 suffix = apply_max_suffix(&speed, 1000); 417 418 return suffix ? sysfs_emit(buf, "%lu%c\n", speed, suffix) : 419 sysfs_emit(buf, "%lu\n", speed); 420 } 421 422 static DEVICE_ATTR_RO(speed_bps); 423 424 static ssize_t util_string_read(struct file *filp, struct kobject *kobj, 425 struct bin_attribute *attr, char *buf, 426 loff_t off, size_t count) 427 { 428 struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); 429 ssize_t rc; 430 431 mutex_lock(&chp->lock); 432 rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, 433 sizeof(chp->desc_fmt3.util_str)); 434 mutex_unlock(&chp->lock); 435 436 return rc; 437 } 438 static BIN_ATTR_RO(util_string, 439 sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); 440 441 static struct bin_attribute *chp_bin_attrs[] = { 442 &bin_attr_util_string, 443 NULL, 444 }; 445 446 static struct attribute *chp_attrs[] = { 447 &dev_attr_status.attr, 448 &dev_attr_configure.attr, 449 &dev_attr_type.attr, 450 &dev_attr_cmg.attr, 451 &dev_attr_shared.attr, 452 &dev_attr_chid.attr, 453 &dev_attr_chid_external.attr, 454 &dev_attr_esc.attr, 455 &dev_attr_speed_bps.attr, 456 NULL, 457 }; 458 static struct attribute_group chp_attr_group = { 459 .attrs = chp_attrs, 460 .bin_attrs = chp_bin_attrs, 461 }; 462 static const struct attribute_group *chp_attr_groups[] = { 463 &chp_attr_group, 464 NULL, 465 }; 466 467 static void chp_release(struct device *dev) 468 { 469 struct channel_path *cp; 470 471 cp = to_channelpath(dev); 472 kfree(cp); 473 } 474 475 /** 476 * chp_update_desc - update channel-path description 477 * @chp: channel-path 478 * 479 * Update the channel-path description of the specified channel-path 480 * including channel measurement related information. 481 * Return zero on success, non-zero otherwise. 482 */ 483 int chp_update_desc(struct channel_path *chp) 484 { 485 int rc; 486 487 rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); 488 if (rc) 489 return rc; 490 491 /* 492 * Fetching the following data is optional. Not all machines or 493 * hypervisors implement the required chsc commands. 494 */ 495 chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); 496 chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); 497 chsc_get_channel_measurement_chars(chp); 498 499 return 0; 500 } 501 502 /** 503 * chp_new - register a new channel-path 504 * @chpid: channel-path ID 505 * 506 * Create and register data structure representing new channel-path. Return 507 * zero on success, non-zero otherwise. 508 */ 509 int chp_new(struct chp_id chpid) 510 { 511 struct channel_subsystem *css = css_by_id(chpid.cssid); 512 struct channel_path *chp; 513 int ret = 0; 514 515 mutex_lock(&css->mutex); 516 if (chp_is_registered(chpid)) 517 goto out; 518 519 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); 520 if (!chp) { 521 ret = -ENOMEM; 522 goto out; 523 } 524 /* fill in status, etc. */ 525 chp->chpid = chpid; 526 chp->state = 1; 527 chp->dev.parent = &css->device; 528 chp->dev.groups = chp_attr_groups; 529 chp->dev.release = chp_release; 530 mutex_init(&chp->lock); 531 532 /* Obtain channel path description and fill it in. */ 533 ret = chp_update_desc(chp); 534 if (ret) 535 goto out_free; 536 if ((chp->desc.flags & 0x80) == 0) { 537 ret = -ENODEV; 538 goto out_free; 539 } 540 dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); 541 542 /* make it known to the system */ 543 ret = device_register(&chp->dev); 544 if (ret) { 545 CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", 546 chpid.cssid, chpid.id, ret); 547 put_device(&chp->dev); 548 goto out; 549 } 550 551 if (css->cm_enabled) { 552 ret = chp_add_cmg_attr(chp); 553 if (ret) { 554 device_unregister(&chp->dev); 555 goto out; 556 } 557 } 558 css->chps[chpid.id] = chp; 559 goto out; 560 out_free: 561 kfree(chp); 562 out: 563 mutex_unlock(&css->mutex); 564 return ret; 565 } 566 567 /** 568 * chp_get_chp_desc - return newly allocated channel-path description 569 * @chpid: channel-path ID 570 * 571 * On success return a newly allocated copy of the channel-path description 572 * data associated with the given channel-path ID. Return %NULL on error. 573 */ 574 struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) 575 { 576 struct channel_path *chp; 577 struct channel_path_desc_fmt0 *desc; 578 579 chp = chpid_to_chp(chpid); 580 if (!chp) 581 return NULL; 582 desc = kmalloc(sizeof(*desc), GFP_KERNEL); 583 if (!desc) 584 return NULL; 585 586 mutex_lock(&chp->lock); 587 memcpy(desc, &chp->desc, sizeof(*desc)); 588 mutex_unlock(&chp->lock); 589 return desc; 590 } 591 592 /** 593 * chp_process_crw - process channel-path status change 594 * @crw0: channel report-word to handler 595 * @crw1: second channel-report word (always NULL) 596 * @overflow: crw overflow indication 597 * 598 * Handle channel-report-words indicating that the status of a channel-path 599 * has changed. 600 */ 601 static void chp_process_crw(struct crw *crw0, struct crw *crw1, 602 int overflow) 603 { 604 struct chp_id chpid; 605 606 if (overflow) { 607 css_schedule_eval_all(); 608 return; 609 } 610 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " 611 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", 612 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, 613 crw0->erc, crw0->rsid); 614 /* 615 * Check for solicited machine checks. These are 616 * created by reset channel path and need not be 617 * handled here. 618 */ 619 if (crw0->slct) { 620 CIO_CRW_EVENT(2, "solicited machine check for " 621 "channel path %02X\n", crw0->rsid); 622 return; 623 } 624 chp_id_init(&chpid); 625 chpid.id = crw0->rsid; 626 switch (crw0->erc) { 627 case CRW_ERC_IPARM: /* Path has come. */ 628 case CRW_ERC_INIT: 629 chp_new(chpid); 630 chsc_chp_online(chpid); 631 break; 632 case CRW_ERC_PERRI: /* Path has gone. */ 633 case CRW_ERC_PERRN: 634 chsc_chp_offline(chpid); 635 break; 636 default: 637 CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", 638 crw0->erc); 639 } 640 } 641 642 int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) 643 { 644 int i; 645 int mask; 646 647 for (i = 0; i < 8; i++) { 648 mask = 0x80 >> i; 649 if (!(ssd->path_mask & mask)) 650 continue; 651 if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) 652 continue; 653 if ((ssd->fla_valid_mask & mask) && 654 ((ssd->fla[i] & link->fla_mask) != link->fla)) 655 continue; 656 return mask; 657 } 658 return 0; 659 } 660 EXPORT_SYMBOL_GPL(chp_ssd_get_mask); 661 662 static inline int info_bit_num(struct chp_id id) 663 { 664 return id.id + id.cssid * (__MAX_CHPID + 1); 665 } 666 667 /* Force chp_info refresh on next call to info_validate(). */ 668 static void info_expire(void) 669 { 670 mutex_lock(&info_lock); 671 chp_info_expires = jiffies - 1; 672 mutex_unlock(&info_lock); 673 } 674 675 /* Ensure that chp_info is up-to-date. */ 676 static int info_update(void) 677 { 678 int rc; 679 680 mutex_lock(&info_lock); 681 rc = 0; 682 if (time_after(jiffies, chp_info_expires)) { 683 /* Data is too old, update. */ 684 rc = sclp_chp_read_info(&chp_info); 685 chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; 686 } 687 mutex_unlock(&info_lock); 688 689 return rc; 690 } 691 692 /** 693 * chp_info_get_status - retrieve configure status of a channel-path 694 * @chpid: channel-path ID 695 * 696 * On success, return 0 for standby, 1 for configured, 2 for reserved, 697 * 3 for not recognized. Return negative error code on error. 698 */ 699 int chp_info_get_status(struct chp_id chpid) 700 { 701 int rc; 702 int bit; 703 704 rc = info_update(); 705 if (rc) 706 return rc; 707 708 bit = info_bit_num(chpid); 709 mutex_lock(&info_lock); 710 if (!chp_test_bit(chp_info.recognized, bit)) 711 rc = CHP_STATUS_NOT_RECOGNIZED; 712 else if (chp_test_bit(chp_info.configured, bit)) 713 rc = CHP_STATUS_CONFIGURED; 714 else if (chp_test_bit(chp_info.standby, bit)) 715 rc = CHP_STATUS_STANDBY; 716 else 717 rc = CHP_STATUS_RESERVED; 718 mutex_unlock(&info_lock); 719 720 return rc; 721 } 722 723 /* Return configure task for chpid. */ 724 static enum cfg_task_t cfg_get_task(struct chp_id chpid) 725 { 726 return chp_cfg_task[chpid.cssid][chpid.id]; 727 } 728 729 /* Set configure task for chpid. */ 730 static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) 731 { 732 chp_cfg_task[chpid.cssid][chpid.id] = cfg; 733 } 734 735 /* Fetch the first configure task. Set chpid accordingly. */ 736 static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) 737 { 738 enum cfg_task_t t = cfg_none; 739 740 chp_id_for_each(chpid) { 741 t = cfg_get_task(*chpid); 742 if (t != cfg_none) 743 break; 744 } 745 746 return t; 747 } 748 749 /* Perform one configure/deconfigure request. Reschedule work function until 750 * last request. */ 751 static void cfg_func(struct work_struct *work) 752 { 753 struct chp_id chpid; 754 enum cfg_task_t t; 755 int rc; 756 757 spin_lock(&cfg_lock); 758 t = chp_cfg_fetch_task(&chpid); 759 spin_unlock(&cfg_lock); 760 761 switch (t) { 762 case cfg_configure: 763 rc = sclp_chp_configure(chpid); 764 if (rc) 765 CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" 766 "%d\n", chpid.cssid, chpid.id, rc); 767 else { 768 info_expire(); 769 chsc_chp_online(chpid); 770 } 771 break; 772 case cfg_deconfigure: 773 rc = sclp_chp_deconfigure(chpid); 774 if (rc) 775 CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" 776 "%d\n", chpid.cssid, chpid.id, rc); 777 else { 778 info_expire(); 779 chsc_chp_offline(chpid); 780 } 781 break; 782 case cfg_none: 783 /* Get updated information after last change. */ 784 info_update(); 785 wake_up_interruptible(&cfg_wait_queue); 786 return; 787 } 788 spin_lock(&cfg_lock); 789 if (t == cfg_get_task(chpid)) 790 cfg_set_task(chpid, cfg_none); 791 spin_unlock(&cfg_lock); 792 schedule_work(&cfg_work); 793 } 794 795 /** 796 * chp_cfg_schedule - schedule chpid configuration request 797 * @chpid: channel-path ID 798 * @configure: Non-zero for configure, zero for deconfigure 799 * 800 * Schedule a channel-path configuration/deconfiguration request. 801 */ 802 void chp_cfg_schedule(struct chp_id chpid, int configure) 803 { 804 CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, 805 configure); 806 spin_lock(&cfg_lock); 807 cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); 808 spin_unlock(&cfg_lock); 809 schedule_work(&cfg_work); 810 } 811 812 /** 813 * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request 814 * @chpid: channel-path ID 815 * 816 * Cancel an active channel-path deconfiguration request if it has not yet 817 * been performed. 818 */ 819 void chp_cfg_cancel_deconfigure(struct chp_id chpid) 820 { 821 CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); 822 spin_lock(&cfg_lock); 823 if (cfg_get_task(chpid) == cfg_deconfigure) 824 cfg_set_task(chpid, cfg_none); 825 spin_unlock(&cfg_lock); 826 } 827 828 static bool cfg_idle(void) 829 { 830 struct chp_id chpid; 831 enum cfg_task_t t; 832 833 spin_lock(&cfg_lock); 834 t = chp_cfg_fetch_task(&chpid); 835 spin_unlock(&cfg_lock); 836 837 return t == cfg_none; 838 } 839 840 static int cfg_wait_idle(void) 841 { 842 if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) 843 return -ERESTARTSYS; 844 return 0; 845 } 846 847 static int __init chp_init(void) 848 { 849 struct chp_id chpid; 850 int state, ret; 851 852 ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); 853 if (ret) 854 return ret; 855 INIT_WORK(&cfg_work, cfg_func); 856 if (info_update()) 857 return 0; 858 /* Register available channel-paths. */ 859 chp_id_for_each(&chpid) { 860 state = chp_info_get_status(chpid); 861 if (state == CHP_STATUS_CONFIGURED || 862 state == CHP_STATUS_STANDBY) 863 chp_new(chpid); 864 } 865 866 return 0; 867 } 868 869 subsys_initcall(chp_init); 870