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struct sclp_chp_info chp_info; 45 static DEFINE_MUTEX(info_lock); 46 47 /* Time after which channel-path status may be outdated.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 scnprintf(dbf_text, sizeof(dbf_text), 115 on ? "varyon%x.%02x" : "varyoff%x.%02x", 116 chpid.cssid, chpid.id); 117 CIO_TRACE_EVENT(2, dbf_text); 118 119 status = chp_get_status(chpid); 120 if (!on && !status) 121 return 0; 122 123 set_chp_logically_online(chpid, on); 124 chsc_chp_vary(chpid, on); 125 return 0; 126 } 127 128 /* 129 * Channel measurement related functions 130 */ 131 static ssize_t measurement_chars_read(struct file *filp, struct kobject *kobj, 132 const 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 static const BIN_ATTR_ADMIN_RO(measurement_chars, sizeof(struct cmg_chars)); 147 148 static ssize_t measurement_chars_full_read(struct file *filp, 149 struct kobject *kobj, 150 const struct bin_attribute *bin_attr, 151 char *buf, loff_t off, size_t count) 152 { 153 struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); 154 155 return memory_read_from_buffer(buf, count, &off, &chp->cmcb, 156 sizeof(chp->cmcb)); 157 } 158 static BIN_ATTR_ADMIN_RO(measurement_chars_full, sizeof(struct cmg_cmcb)); 159 160 static ssize_t chp_measurement_copy_block(void *buf, loff_t off, size_t count, 161 struct kobject *kobj, bool extended) 162 { 163 struct channel_path *chp; 164 struct channel_subsystem *css; 165 struct device *device; 166 unsigned int size; 167 void *area, *entry; 168 int id, idx; 169 170 device = kobj_to_dev(kobj); 171 chp = to_channelpath(device); 172 css = to_css(chp->dev.parent); 173 id = chp->chpid.id; 174 175 if (extended) { 176 /* Check if extended measurement data is available. */ 177 if (!chp->extended) 178 return 0; 179 180 size = sizeof(struct cmg_ext_entry); 181 area = css->ecub[id / CSS_ECUES_PER_PAGE]; 182 idx = id % CSS_ECUES_PER_PAGE; 183 } else { 184 size = sizeof(struct cmg_entry); 185 area = css->cub[id / CSS_CUES_PER_PAGE]; 186 idx = id % CSS_CUES_PER_PAGE; 187 } 188 entry = area + (idx * size); 189 190 /* Only allow single reads. */ 191 if (off || count < size) 192 return 0; 193 194 memcpy(buf, entry, size); 195 196 return size; 197 } 198 199 static ssize_t measurement_read(struct file *filp, struct kobject *kobj, 200 const struct bin_attribute *bin_attr, 201 char *buf, loff_t off, size_t count) 202 { 203 return chp_measurement_copy_block(buf, off, count, kobj, false); 204 } 205 static const BIN_ATTR_ADMIN_RO(measurement, sizeof(struct cmg_entry)); 206 207 static ssize_t ext_measurement_read(struct file *filp, struct kobject *kobj, 208 const struct bin_attribute *bin_attr, 209 char *buf, loff_t off, size_t count) 210 { 211 return chp_measurement_copy_block(buf, off, count, kobj, true); 212 } 213 static const BIN_ATTR_ADMIN_RO(ext_measurement, sizeof(struct cmg_ext_entry)); 214 215 static const struct bin_attribute *measurement_attrs[] = { 216 &bin_attr_measurement_chars, 217 &bin_attr_measurement_chars_full, 218 &bin_attr_measurement, 219 &bin_attr_ext_measurement, 220 NULL, 221 }; 222 BIN_ATTRIBUTE_GROUPS(measurement); 223 224 void chp_remove_cmg_attr(struct channel_path *chp) 225 { 226 device_remove_groups(&chp->dev, measurement_groups); 227 } 228 229 int chp_add_cmg_attr(struct channel_path *chp) 230 { 231 return device_add_groups(&chp->dev, measurement_groups); 232 } 233 234 /* 235 * Files for the channel path entries. 236 */ 237 static ssize_t chp_status_show(struct device *dev, 238 struct device_attribute *attr, char *buf) 239 { 240 struct channel_path *chp = to_channelpath(dev); 241 int status; 242 243 mutex_lock(&chp->lock); 244 status = chp->state; 245 mutex_unlock(&chp->lock); 246 247 return status ? sysfs_emit(buf, "online\n") : sysfs_emit(buf, "offline\n"); 248 } 249 250 static ssize_t chp_status_write(struct device *dev, 251 struct device_attribute *attr, 252 const char *buf, size_t count) 253 { 254 struct channel_path *cp = to_channelpath(dev); 255 char cmd[10]; 256 int num_args; 257 int error; 258 259 num_args = sscanf(buf, "%5s", cmd); 260 if (!num_args) 261 return count; 262 263 /* Wait until previous actions have settled. */ 264 css_wait_for_slow_path(); 265 266 if (!strncasecmp(cmd, "on", 2) || !strcmp(cmd, "1")) { 267 mutex_lock(&cp->lock); 268 error = s390_vary_chpid(cp->chpid, 1); 269 mutex_unlock(&cp->lock); 270 } else if (!strncasecmp(cmd, "off", 3) || !strcmp(cmd, "0")) { 271 mutex_lock(&cp->lock); 272 error = s390_vary_chpid(cp->chpid, 0); 273 mutex_unlock(&cp->lock); 274 } else 275 error = -EINVAL; 276 277 return error < 0 ? error : count; 278 } 279 280 static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); 281 282 static ssize_t chp_configure_show(struct device *dev, 283 struct device_attribute *attr, char *buf) 284 { 285 struct channel_path *cp; 286 int status; 287 288 cp = to_channelpath(dev); 289 status = chp_info_get_status(cp->chpid); 290 if (status < 0) 291 return status; 292 293 return sysfs_emit(buf, "%d\n", status); 294 } 295 296 static int cfg_wait_idle(void); 297 298 static ssize_t chp_configure_write(struct device *dev, 299 struct device_attribute *attr, 300 const char *buf, size_t count) 301 { 302 struct channel_path *cp; 303 int val; 304 char delim; 305 306 if (sscanf(buf, "%d %c", &val, &delim) != 1) 307 return -EINVAL; 308 if (val != 0 && val != 1) 309 return -EINVAL; 310 cp = to_channelpath(dev); 311 chp_cfg_schedule(cp->chpid, val); 312 cfg_wait_idle(); 313 314 return count; 315 } 316 317 static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); 318 319 static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, 320 char *buf) 321 { 322 struct channel_path *chp = to_channelpath(dev); 323 u8 type; 324 325 mutex_lock(&chp->lock); 326 type = chp->desc.desc; 327 mutex_unlock(&chp->lock); 328 return sysfs_emit(buf, "%x\n", type); 329 } 330 331 static DEVICE_ATTR(type, 0444, chp_type_show, NULL); 332 333 static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, 334 char *buf) 335 { 336 struct channel_path *chp = to_channelpath(dev); 337 338 if (!chp) 339 return 0; 340 if (chp->cmg == -1) /* channel measurements not available */ 341 return sysfs_emit(buf, "unknown\n"); 342 return sysfs_emit(buf, "%d\n", chp->cmg); 343 } 344 345 static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); 346 347 static ssize_t chp_shared_show(struct device *dev, 348 struct device_attribute *attr, char *buf) 349 { 350 struct channel_path *chp = to_channelpath(dev); 351 352 if (!chp) 353 return 0; 354 if (chp->shared == -1) /* channel measurements not available */ 355 return sysfs_emit(buf, "unknown\n"); 356 return sysfs_emit(buf, "%x\n", chp->shared); 357 } 358 359 static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); 360 361 static ssize_t chp_chid_show(struct device *dev, struct device_attribute *attr, 362 char *buf) 363 { 364 struct channel_path *chp = to_channelpath(dev); 365 ssize_t rc; 366 367 mutex_lock(&chp->lock); 368 if (chp->desc_fmt1.flags & 0x10) 369 rc = sysfs_emit(buf, "%04x\n", chp->desc_fmt1.chid); 370 else 371 rc = 0; 372 mutex_unlock(&chp->lock); 373 374 return rc; 375 } 376 static DEVICE_ATTR(chid, 0444, chp_chid_show, NULL); 377 378 static ssize_t chp_chid_external_show(struct device *dev, 379 struct device_attribute *attr, char *buf) 380 { 381 struct channel_path *chp = to_channelpath(dev); 382 ssize_t rc; 383 384 mutex_lock(&chp->lock); 385 if (chp->desc_fmt1.flags & 0x10) 386 rc = sysfs_emit(buf, "%x\n", chp->desc_fmt1.flags & 0x8 ? 1 : 0); 387 else 388 rc = 0; 389 mutex_unlock(&chp->lock); 390 391 return rc; 392 } 393 static DEVICE_ATTR(chid_external, 0444, chp_chid_external_show, NULL); 394 395 static ssize_t chp_esc_show(struct device *dev, 396 struct device_attribute *attr, char *buf) 397 { 398 struct channel_path *chp = to_channelpath(dev); 399 ssize_t rc; 400 401 mutex_lock(&chp->lock); 402 rc = sysfs_emit(buf, "%x\n", chp->desc_fmt1.esc); 403 mutex_unlock(&chp->lock); 404 405 return rc; 406 } 407 static DEVICE_ATTR(esc, 0444, chp_esc_show, NULL); 408 409 static char apply_max_suffix(unsigned long *value, unsigned long base) 410 { 411 static char suffixes[] = { 0, 'K', 'M', 'G', 'T' }; 412 int i; 413 414 for (i = 0; i < ARRAY_SIZE(suffixes) - 1; i++) { 415 if (*value < base || *value % base != 0) 416 break; 417 *value /= base; 418 } 419 420 return suffixes[i]; 421 } 422 423 static ssize_t speed_bps_show(struct device *dev, 424 struct device_attribute *attr, char *buf) 425 { 426 struct channel_path *chp = to_channelpath(dev); 427 unsigned long speed = chp->speed; 428 char suffix; 429 430 suffix = apply_max_suffix(&speed, 1000); 431 432 return suffix ? sysfs_emit(buf, "%lu%c\n", speed, suffix) : 433 sysfs_emit(buf, "%lu\n", speed); 434 } 435 436 static DEVICE_ATTR_RO(speed_bps); 437 438 static ssize_t util_string_read(struct file *filp, struct kobject *kobj, 439 const struct bin_attribute *attr, char *buf, 440 loff_t off, size_t count) 441 { 442 struct channel_path *chp = to_channelpath(kobj_to_dev(kobj)); 443 ssize_t rc; 444 445 mutex_lock(&chp->lock); 446 rc = memory_read_from_buffer(buf, count, &off, chp->desc_fmt3.util_str, 447 sizeof(chp->desc_fmt3.util_str)); 448 mutex_unlock(&chp->lock); 449 450 return rc; 451 } 452 static const BIN_ATTR_RO(util_string, 453 sizeof(((struct channel_path_desc_fmt3 *)0)->util_str)); 454 455 static const struct bin_attribute *const chp_bin_attrs[] = { 456 &bin_attr_util_string, 457 NULL, 458 }; 459 460 static struct attribute *chp_attrs[] = { 461 &dev_attr_status.attr, 462 &dev_attr_configure.attr, 463 &dev_attr_type.attr, 464 &dev_attr_cmg.attr, 465 &dev_attr_shared.attr, 466 &dev_attr_chid.attr, 467 &dev_attr_chid_external.attr, 468 &dev_attr_esc.attr, 469 &dev_attr_speed_bps.attr, 470 NULL, 471 }; 472 static const struct attribute_group chp_attr_group = { 473 .attrs = chp_attrs, 474 .bin_attrs = chp_bin_attrs, 475 }; 476 static const struct attribute_group *chp_attr_groups[] = { 477 &chp_attr_group, 478 NULL, 479 }; 480 481 static void chp_release(struct device *dev) 482 { 483 struct channel_path *cp; 484 485 cp = to_channelpath(dev); 486 kfree(cp); 487 } 488 489 /** 490 * chp_update_desc - update channel-path description 491 * @chp: channel-path 492 * 493 * Update the channel-path description of the specified channel-path 494 * including channel measurement related information. 495 * Return zero on success, non-zero otherwise. 496 */ 497 int chp_update_desc(struct channel_path *chp) 498 { 499 int rc; 500 501 rc = chsc_determine_fmt0_channel_path_desc(chp->chpid, &chp->desc); 502 if (rc) 503 return rc; 504 505 /* 506 * Fetching the following data is optional. Not all machines or 507 * hypervisors implement the required chsc commands. 508 */ 509 chsc_determine_fmt1_channel_path_desc(chp->chpid, &chp->desc_fmt1); 510 chsc_determine_fmt3_channel_path_desc(chp->chpid, &chp->desc_fmt3); 511 chsc_get_channel_measurement_chars(chp); 512 513 return 0; 514 } 515 516 /** 517 * chp_new - register a new channel-path 518 * @chpid: channel-path ID 519 * 520 * Create and register data structure representing new channel-path. Return 521 * zero on success, non-zero otherwise. 522 */ 523 int chp_new(struct chp_id chpid) 524 { 525 struct channel_subsystem *css = css_by_id(chpid.cssid); 526 struct channel_path *chp; 527 int ret = 0; 528 529 mutex_lock(&css->mutex); 530 if (chp_is_registered(chpid)) 531 goto out; 532 533 chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); 534 if (!chp) { 535 ret = -ENOMEM; 536 goto out; 537 } 538 /* fill in status, etc. */ 539 chp->chpid = chpid; 540 chp->state = 1; 541 chp->dev.parent = &css->device; 542 chp->dev.groups = chp_attr_groups; 543 chp->dev.release = chp_release; 544 mutex_init(&chp->lock); 545 546 /* Obtain channel path description and fill it in. */ 547 ret = chp_update_desc(chp); 548 if (ret) 549 goto out_free; 550 if ((chp->desc.flags & 0x80) == 0) { 551 ret = -ENODEV; 552 goto out_free; 553 } 554 dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id); 555 556 /* make it known to the system */ 557 ret = device_register(&chp->dev); 558 if (ret) { 559 CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", 560 chpid.cssid, chpid.id, ret); 561 put_device(&chp->dev); 562 goto out; 563 } 564 565 if (css->cm_enabled) { 566 ret = chp_add_cmg_attr(chp); 567 if (ret) { 568 device_unregister(&chp->dev); 569 goto out; 570 } 571 } 572 css->chps[chpid.id] = chp; 573 goto out; 574 out_free: 575 kfree(chp); 576 out: 577 mutex_unlock(&css->mutex); 578 return ret; 579 } 580 581 /** 582 * chp_get_chp_desc - return newly allocated channel-path description 583 * @chpid: channel-path ID 584 * 585 * On success return a newly allocated copy of the channel-path description 586 * data associated with the given channel-path ID. Return %NULL on error. 587 */ 588 struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid) 589 { 590 struct channel_path *chp; 591 struct channel_path_desc_fmt0 *desc; 592 593 chp = chpid_to_chp(chpid); 594 if (!chp) 595 return NULL; 596 desc = kmalloc(sizeof(*desc), GFP_KERNEL); 597 if (!desc) 598 return NULL; 599 600 mutex_lock(&chp->lock); 601 memcpy(desc, &chp->desc, sizeof(*desc)); 602 mutex_unlock(&chp->lock); 603 return desc; 604 } 605 606 /** 607 * chp_process_crw - process channel-path status change 608 * @crw0: channel report-word to handler 609 * @crw1: second channel-report word (always NULL) 610 * @overflow: crw overflow indication 611 * 612 * Handle channel-report-words indicating that the status of a channel-path 613 * has changed. 614 */ 615 static void chp_process_crw(struct crw *crw0, struct crw *crw1, 616 int overflow) 617 { 618 struct chp_id chpid; 619 620 if (overflow) { 621 css_schedule_eval_all(); 622 return; 623 } 624 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, " 625 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n", 626 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc, 627 crw0->erc, crw0->rsid); 628 /* 629 * Check for solicited machine checks. These are 630 * created by reset channel path and need not be 631 * handled here. 632 */ 633 if (crw0->slct) { 634 CIO_CRW_EVENT(2, "solicited machine check for " 635 "channel path %02X\n", crw0->rsid); 636 return; 637 } 638 chp_id_init(&chpid); 639 chpid.id = crw0->rsid; 640 switch (crw0->erc) { 641 case CRW_ERC_IPARM: /* Path has come. */ 642 case CRW_ERC_INIT: 643 chp_new(chpid); 644 chsc_chp_online(chpid); 645 break; 646 case CRW_ERC_PERRI: /* Path has gone. */ 647 case CRW_ERC_PERRN: 648 chsc_chp_offline(chpid); 649 break; 650 default: 651 CIO_CRW_EVENT(2, "Don't know how to handle erc=%x\n", 652 crw0->erc); 653 } 654 } 655 656 int chp_ssd_get_mask(struct chsc_ssd_info *ssd, struct chp_link *link) 657 { 658 int i; 659 int mask; 660 661 for (i = 0; i < 8; i++) { 662 mask = 0x80 >> i; 663 if (!(ssd->path_mask & mask)) 664 continue; 665 if (!chp_id_is_equal(&ssd->chpid[i], &link->chpid)) 666 continue; 667 if ((ssd->fla_valid_mask & mask) && 668 ((ssd->fla[i] & link->fla_mask) != link->fla)) 669 continue; 670 return mask; 671 } 672 return 0; 673 } 674 EXPORT_SYMBOL_GPL(chp_ssd_get_mask); 675 676 static inline int info_bit_num(struct chp_id id) 677 { 678 return id.id + id.cssid * (__MAX_CHPID + 1); 679 } 680 681 /* Force chp_info refresh on next call to info_validate(). */ 682 static void info_expire(void) 683 { 684 mutex_lock(&info_lock); 685 chp_info_expires = jiffies - 1; 686 mutex_unlock(&info_lock); 687 } 688 689 /* Ensure that chp_info is up-to-date. */ 690 static int info_update(void) 691 { 692 int rc; 693 694 mutex_lock(&info_lock); 695 rc = 0; 696 if (time_after(jiffies, chp_info_expires)) { 697 /* Data is too old, update. */ 698 rc = sclp_chp_read_info(&chp_info); 699 if (!rc) 700 chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL; 701 } 702 mutex_unlock(&info_lock); 703 704 return rc; 705 } 706 707 /** 708 * chp_info_get_status - retrieve configure status of a channel-path 709 * @chpid: channel-path ID 710 * 711 * On success, return 0 for standby, 1 for configured, 2 for reserved, 712 * 3 for not recognized. Return negative error code on error. 713 */ 714 int chp_info_get_status(struct chp_id chpid) 715 { 716 int rc; 717 int bit; 718 719 rc = info_update(); 720 if (rc) 721 return rc; 722 723 bit = info_bit_num(chpid); 724 mutex_lock(&info_lock); 725 if (!chp_test_bit(chp_info.recognized, bit)) 726 rc = CHP_STATUS_NOT_RECOGNIZED; 727 else if (chp_test_bit(chp_info.configured, bit)) 728 rc = CHP_STATUS_CONFIGURED; 729 else if (chp_test_bit(chp_info.standby, bit)) 730 rc = CHP_STATUS_STANDBY; 731 else 732 rc = CHP_STATUS_RESERVED; 733 mutex_unlock(&info_lock); 734 735 return rc; 736 } 737 738 /* Return configure task for chpid. */ 739 static enum cfg_task_t cfg_get_task(struct chp_id chpid) 740 { 741 return chp_cfg_task[chpid.cssid][chpid.id]; 742 } 743 744 /* Set configure task for chpid. */ 745 static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) 746 { 747 chp_cfg_task[chpid.cssid][chpid.id] = cfg; 748 } 749 750 /* Fetch the first configure task. Set chpid accordingly. */ 751 static enum cfg_task_t chp_cfg_fetch_task(struct chp_id *chpid) 752 { 753 enum cfg_task_t t = cfg_none; 754 755 chp_id_for_each(chpid) { 756 t = cfg_get_task(*chpid); 757 if (t != cfg_none) 758 break; 759 } 760 761 return t; 762 } 763 764 /* Perform one configure/deconfigure request. Reschedule work function until 765 * last request. */ 766 static void cfg_func(struct work_struct *work) 767 { 768 struct chp_id chpid; 769 enum cfg_task_t t; 770 int rc; 771 772 spin_lock(&cfg_lock); 773 t = chp_cfg_fetch_task(&chpid); 774 spin_unlock(&cfg_lock); 775 776 switch (t) { 777 case cfg_configure: 778 rc = sclp_chp_configure(chpid); 779 if (rc) 780 CIO_MSG_EVENT(2, "chp: sclp_chp_configure(%x.%02x)=" 781 "%d\n", chpid.cssid, chpid.id, rc); 782 else { 783 info_expire(); 784 chsc_chp_online(chpid); 785 } 786 break; 787 case cfg_deconfigure: 788 rc = sclp_chp_deconfigure(chpid); 789 if (rc) 790 CIO_MSG_EVENT(2, "chp: sclp_chp_deconfigure(%x.%02x)=" 791 "%d\n", chpid.cssid, chpid.id, rc); 792 else { 793 info_expire(); 794 chsc_chp_offline(chpid); 795 } 796 break; 797 case cfg_none: 798 /* Get updated information after last change. */ 799 info_update(); 800 wake_up_interruptible(&cfg_wait_queue); 801 return; 802 } 803 spin_lock(&cfg_lock); 804 if (t == cfg_get_task(chpid)) 805 cfg_set_task(chpid, cfg_none); 806 spin_unlock(&cfg_lock); 807 schedule_work(&cfg_work); 808 } 809 810 /** 811 * chp_cfg_schedule - schedule chpid configuration request 812 * @chpid: channel-path ID 813 * @configure: Non-zero for configure, zero for deconfigure 814 * 815 * Schedule a channel-path configuration/deconfiguration request. 816 */ 817 void chp_cfg_schedule(struct chp_id chpid, int configure) 818 { 819 CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, 820 configure); 821 spin_lock(&cfg_lock); 822 cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); 823 spin_unlock(&cfg_lock); 824 schedule_work(&cfg_work); 825 } 826 827 /** 828 * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request 829 * @chpid: channel-path ID 830 * 831 * Cancel an active channel-path deconfiguration request if it has not yet 832 * been performed. 833 */ 834 void chp_cfg_cancel_deconfigure(struct chp_id chpid) 835 { 836 CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); 837 spin_lock(&cfg_lock); 838 if (cfg_get_task(chpid) == cfg_deconfigure) 839 cfg_set_task(chpid, cfg_none); 840 spin_unlock(&cfg_lock); 841 } 842 843 static bool cfg_idle(void) 844 { 845 struct chp_id chpid; 846 enum cfg_task_t t; 847 848 spin_lock(&cfg_lock); 849 t = chp_cfg_fetch_task(&chpid); 850 spin_unlock(&cfg_lock); 851 852 return t == cfg_none; 853 } 854 855 static int cfg_wait_idle(void) 856 { 857 if (wait_event_interruptible(cfg_wait_queue, cfg_idle())) 858 return -ERESTARTSYS; 859 return 0; 860 } 861 862 static int __init chp_init(void) 863 { 864 struct chp_id chpid; 865 int state, ret; 866 867 ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); 868 if (ret) 869 return ret; 870 INIT_WORK(&cfg_work, cfg_func); 871 if (info_update()) 872 return 0; 873 /* Register available channel-paths. */ 874 chp_id_for_each(&chpid) { 875 state = chp_info_get_status(chpid); 876 if (state == CHP_STATUS_CONFIGURED || 877 state == CHP_STATUS_STANDBY) 878 chp_new(chpid); 879 } 880 881 return 0; 882 } 883 884 subsys_initcall(chp_init); 885