1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright IBM Corp. 2006, 2012 4 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Ralph Wuerthner <rwuerthn@de.ibm.com> 7 * Felix Beck <felix.beck@de.ibm.com> 8 * Holger Dengler <hd@linux.vnet.ibm.com> 9 * 10 * Adjunct processor bus. 11 */ 12 13 #define KMSG_COMPONENT "ap" 14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 15 16 #include <linux/kernel_stat.h> 17 #include <linux/moduleparam.h> 18 #include <linux/init.h> 19 #include <linux/delay.h> 20 #include <linux/err.h> 21 #include <linux/interrupt.h> 22 #include <linux/workqueue.h> 23 #include <linux/slab.h> 24 #include <linux/notifier.h> 25 #include <linux/kthread.h> 26 #include <linux/mutex.h> 27 #include <linux/suspend.h> 28 #include <asm/airq.h> 29 #include <linux/atomic.h> 30 #include <asm/isc.h> 31 #include <linux/hrtimer.h> 32 #include <linux/ktime.h> 33 #include <asm/facility.h> 34 #include <linux/crypto.h> 35 #include <linux/mod_devicetable.h> 36 #include <linux/debugfs.h> 37 #include <linux/ctype.h> 38 39 #include "ap_bus.h" 40 #include "ap_debug.h" 41 42 /* 43 * Module parameters; note though this file itself isn't modular. 44 */ 45 int ap_domain_index = -1; /* Adjunct Processor Domain Index */ 46 static DEFINE_SPINLOCK(ap_domain_lock); 47 module_param_named(domain, ap_domain_index, int, 0440); 48 MODULE_PARM_DESC(domain, "domain index for ap devices"); 49 EXPORT_SYMBOL(ap_domain_index); 50 51 static int ap_thread_flag; 52 module_param_named(poll_thread, ap_thread_flag, int, 0440); 53 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); 54 55 static char *apm_str; 56 module_param_named(apmask, apm_str, charp, 0440); 57 MODULE_PARM_DESC(apmask, "AP bus adapter mask."); 58 59 static char *aqm_str; 60 module_param_named(aqmask, aqm_str, charp, 0440); 61 MODULE_PARM_DESC(aqmask, "AP bus domain mask."); 62 63 static struct device *ap_root_device; 64 65 DEFINE_SPINLOCK(ap_list_lock); 66 LIST_HEAD(ap_card_list); 67 68 /* Default permissions (ioctl, card and domain masking) */ 69 struct ap_perms ap_perms; 70 EXPORT_SYMBOL(ap_perms); 71 DEFINE_MUTEX(ap_perms_mutex); 72 EXPORT_SYMBOL(ap_perms_mutex); 73 74 static struct ap_config_info *ap_configuration; 75 static bool initialised; 76 77 /* 78 * AP bus related debug feature things. 79 */ 80 debug_info_t *ap_dbf_info; 81 82 /* 83 * Workqueue timer for bus rescan. 84 */ 85 static struct timer_list ap_config_timer; 86 static int ap_config_time = AP_CONFIG_TIME; 87 static void ap_scan_bus(struct work_struct *); 88 static DECLARE_WORK(ap_scan_work, ap_scan_bus); 89 90 /* 91 * Tasklet & timer for AP request polling and interrupts 92 */ 93 static void ap_tasklet_fn(unsigned long); 94 static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); 95 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); 96 static struct task_struct *ap_poll_kthread; 97 static DEFINE_MUTEX(ap_poll_thread_mutex); 98 static DEFINE_SPINLOCK(ap_poll_timer_lock); 99 static struct hrtimer ap_poll_timer; 100 /* 101 * In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. 102 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling. 103 */ 104 static unsigned long long poll_timeout = 250000; 105 106 /* Suspend flag */ 107 static int ap_suspend_flag; 108 /* Maximum domain id */ 109 static int ap_max_domain_id; 110 /* 111 * Flag to check if domain was set through module parameter domain=. This is 112 * important when supsend and resume is done in a z/VM environment where the 113 * domain might change. 114 */ 115 static int user_set_domain; 116 static struct bus_type ap_bus_type; 117 118 /* Adapter interrupt definitions */ 119 static void ap_interrupt_handler(struct airq_struct *airq); 120 121 static int ap_airq_flag; 122 123 static struct airq_struct ap_airq = { 124 .handler = ap_interrupt_handler, 125 .isc = AP_ISC, 126 }; 127 128 /** 129 * ap_using_interrupts() - Returns non-zero if interrupt support is 130 * available. 131 */ 132 static inline int ap_using_interrupts(void) 133 { 134 return ap_airq_flag; 135 } 136 137 /** 138 * ap_airq_ptr() - Get the address of the adapter interrupt indicator 139 * 140 * Returns the address of the local-summary-indicator of the adapter 141 * interrupt handler for AP, or NULL if adapter interrupts are not 142 * available. 143 */ 144 void *ap_airq_ptr(void) 145 { 146 if (ap_using_interrupts()) 147 return ap_airq.lsi_ptr; 148 return NULL; 149 } 150 151 /** 152 * ap_interrupts_available(): Test if AP interrupts are available. 153 * 154 * Returns 1 if AP interrupts are available. 155 */ 156 static int ap_interrupts_available(void) 157 { 158 return test_facility(65); 159 } 160 161 /** 162 * ap_configuration_available(): Test if AP configuration 163 * information is available. 164 * 165 * Returns 1 if AP configuration information is available. 166 */ 167 static int ap_configuration_available(void) 168 { 169 return test_facility(12); 170 } 171 172 /** 173 * ap_apft_available(): Test if AP facilities test (APFT) 174 * facility is available. 175 * 176 * Returns 1 if APFT is is available. 177 */ 178 static int ap_apft_available(void) 179 { 180 return test_facility(15); 181 } 182 183 /* 184 * ap_qact_available(): Test if the PQAP(QACT) subfunction is available. 185 * 186 * Returns 1 if the QACT subfunction is available. 187 */ 188 static inline int ap_qact_available(void) 189 { 190 if (ap_configuration) 191 return ap_configuration->qact; 192 return 0; 193 } 194 195 /* 196 * ap_query_configuration(): Fetch cryptographic config info 197 * 198 * Returns the ap configuration info fetched via PQAP(QCI). 199 * On success 0 is returned, on failure a negative errno 200 * is returned, e.g. if the PQAP(QCI) instruction is not 201 * available, the return value will be -EOPNOTSUPP. 202 */ 203 static inline int ap_query_configuration(struct ap_config_info *info) 204 { 205 if (!ap_configuration_available()) 206 return -EOPNOTSUPP; 207 if (!info) 208 return -EINVAL; 209 return ap_qci(info); 210 } 211 EXPORT_SYMBOL(ap_query_configuration); 212 213 /** 214 * ap_init_configuration(): Allocate and query configuration array. 215 */ 216 static void ap_init_configuration(void) 217 { 218 if (!ap_configuration_available()) 219 return; 220 221 ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); 222 if (!ap_configuration) 223 return; 224 if (ap_query_configuration(ap_configuration) != 0) { 225 kfree(ap_configuration); 226 ap_configuration = NULL; 227 return; 228 } 229 } 230 231 /* 232 * ap_test_config(): helper function to extract the nrth bit 233 * within the unsigned int array field. 234 */ 235 static inline int ap_test_config(unsigned int *field, unsigned int nr) 236 { 237 return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); 238 } 239 240 /* 241 * ap_test_config_card_id(): Test, whether an AP card ID is configured. 242 * @id AP card ID 243 * 244 * Returns 0 if the card is not configured 245 * 1 if the card is configured or 246 * if the configuration information is not available 247 */ 248 static inline int ap_test_config_card_id(unsigned int id) 249 { 250 if (!ap_configuration) /* QCI not supported */ 251 /* only ids 0...3F may be probed */ 252 return id < 0x40 ? 1 : 0; 253 return ap_test_config(ap_configuration->apm, id); 254 } 255 256 /* 257 * ap_test_config_domain(): Test, whether an AP usage domain is configured. 258 * @domain AP usage domain ID 259 * 260 * Returns 0 if the usage domain is not configured 261 * 1 if the usage domain is configured or 262 * if the configuration information is not available 263 */ 264 static inline int ap_test_config_domain(unsigned int domain) 265 { 266 if (!ap_configuration) /* QCI not supported */ 267 return domain < 16; 268 return ap_test_config(ap_configuration->aqm, domain); 269 } 270 271 /** 272 * ap_query_queue(): Check if an AP queue is available. 273 * @qid: The AP queue number 274 * @queue_depth: Pointer to queue depth value 275 * @device_type: Pointer to device type value 276 * @facilities: Pointer to facility indicator 277 */ 278 static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, 279 unsigned int *facilities) 280 { 281 struct ap_queue_status status; 282 unsigned long info; 283 int nd; 284 285 if (!ap_test_config_card_id(AP_QID_CARD(qid))) 286 return -ENODEV; 287 288 status = ap_test_queue(qid, ap_apft_available(), &info); 289 switch (status.response_code) { 290 case AP_RESPONSE_NORMAL: 291 *queue_depth = (int)(info & 0xff); 292 *device_type = (int)((info >> 24) & 0xff); 293 *facilities = (unsigned int)(info >> 32); 294 /* Update maximum domain id */ 295 nd = (info >> 16) & 0xff; 296 /* if N bit is available, z13 and newer */ 297 if ((info & (1UL << 57)) && nd > 0) 298 ap_max_domain_id = nd; 299 else /* older machine types */ 300 ap_max_domain_id = 15; 301 switch (*device_type) { 302 /* For CEX2 and CEX3 the available functions 303 * are not reflected by the facilities bits. 304 * Instead it is coded into the type. So here 305 * modify the function bits based on the type. 306 */ 307 case AP_DEVICE_TYPE_CEX2A: 308 case AP_DEVICE_TYPE_CEX3A: 309 *facilities |= 0x08000000; 310 break; 311 case AP_DEVICE_TYPE_CEX2C: 312 case AP_DEVICE_TYPE_CEX3C: 313 *facilities |= 0x10000000; 314 break; 315 default: 316 break; 317 } 318 return 0; 319 case AP_RESPONSE_Q_NOT_AVAIL: 320 case AP_RESPONSE_DECONFIGURED: 321 case AP_RESPONSE_CHECKSTOPPED: 322 case AP_RESPONSE_INVALID_ADDRESS: 323 return -ENODEV; 324 case AP_RESPONSE_RESET_IN_PROGRESS: 325 case AP_RESPONSE_OTHERWISE_CHANGED: 326 case AP_RESPONSE_BUSY: 327 return -EBUSY; 328 default: 329 BUG(); 330 } 331 } 332 333 void ap_wait(enum ap_wait wait) 334 { 335 ktime_t hr_time; 336 337 switch (wait) { 338 case AP_WAIT_AGAIN: 339 case AP_WAIT_INTERRUPT: 340 if (ap_using_interrupts()) 341 break; 342 if (ap_poll_kthread) { 343 wake_up(&ap_poll_wait); 344 break; 345 } 346 /* Fall through */ 347 case AP_WAIT_TIMEOUT: 348 spin_lock_bh(&ap_poll_timer_lock); 349 if (!hrtimer_is_queued(&ap_poll_timer)) { 350 hr_time = poll_timeout; 351 hrtimer_forward_now(&ap_poll_timer, hr_time); 352 hrtimer_restart(&ap_poll_timer); 353 } 354 spin_unlock_bh(&ap_poll_timer_lock); 355 break; 356 case AP_WAIT_NONE: 357 default: 358 break; 359 } 360 } 361 362 /** 363 * ap_request_timeout(): Handling of request timeouts 364 * @t: timer making this callback 365 * 366 * Handles request timeouts. 367 */ 368 void ap_request_timeout(struct timer_list *t) 369 { 370 struct ap_queue *aq = from_timer(aq, t, timeout); 371 372 if (ap_suspend_flag) 373 return; 374 spin_lock_bh(&aq->lock); 375 ap_wait(ap_sm_event(aq, AP_EVENT_TIMEOUT)); 376 spin_unlock_bh(&aq->lock); 377 } 378 379 /** 380 * ap_poll_timeout(): AP receive polling for finished AP requests. 381 * @unused: Unused pointer. 382 * 383 * Schedules the AP tasklet using a high resolution timer. 384 */ 385 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) 386 { 387 if (!ap_suspend_flag) 388 tasklet_schedule(&ap_tasklet); 389 return HRTIMER_NORESTART; 390 } 391 392 /** 393 * ap_interrupt_handler() - Schedule ap_tasklet on interrupt 394 * @airq: pointer to adapter interrupt descriptor 395 */ 396 static void ap_interrupt_handler(struct airq_struct *airq) 397 { 398 inc_irq_stat(IRQIO_APB); 399 if (!ap_suspend_flag) 400 tasklet_schedule(&ap_tasklet); 401 } 402 403 /** 404 * ap_tasklet_fn(): Tasklet to poll all AP devices. 405 * @dummy: Unused variable 406 * 407 * Poll all AP devices on the bus. 408 */ 409 static void ap_tasklet_fn(unsigned long dummy) 410 { 411 struct ap_card *ac; 412 struct ap_queue *aq; 413 enum ap_wait wait = AP_WAIT_NONE; 414 415 /* Reset the indicator if interrupts are used. Thus new interrupts can 416 * be received. Doing it in the beginning of the tasklet is therefor 417 * important that no requests on any AP get lost. 418 */ 419 if (ap_using_interrupts()) 420 xchg(ap_airq.lsi_ptr, 0); 421 422 spin_lock_bh(&ap_list_lock); 423 for_each_ap_card(ac) { 424 for_each_ap_queue(aq, ac) { 425 spin_lock_bh(&aq->lock); 426 wait = min(wait, ap_sm_event_loop(aq, AP_EVENT_POLL)); 427 spin_unlock_bh(&aq->lock); 428 } 429 } 430 spin_unlock_bh(&ap_list_lock); 431 432 ap_wait(wait); 433 } 434 435 static int ap_pending_requests(void) 436 { 437 struct ap_card *ac; 438 struct ap_queue *aq; 439 440 spin_lock_bh(&ap_list_lock); 441 for_each_ap_card(ac) { 442 for_each_ap_queue(aq, ac) { 443 if (aq->queue_count == 0) 444 continue; 445 spin_unlock_bh(&ap_list_lock); 446 return 1; 447 } 448 } 449 spin_unlock_bh(&ap_list_lock); 450 return 0; 451 } 452 453 /** 454 * ap_poll_thread(): Thread that polls for finished requests. 455 * @data: Unused pointer 456 * 457 * AP bus poll thread. The purpose of this thread is to poll for 458 * finished requests in a loop if there is a "free" cpu - that is 459 * a cpu that doesn't have anything better to do. The polling stops 460 * as soon as there is another task or if all messages have been 461 * delivered. 462 */ 463 static int ap_poll_thread(void *data) 464 { 465 DECLARE_WAITQUEUE(wait, current); 466 467 set_user_nice(current, MAX_NICE); 468 set_freezable(); 469 while (!kthread_should_stop()) { 470 add_wait_queue(&ap_poll_wait, &wait); 471 set_current_state(TASK_INTERRUPTIBLE); 472 if (ap_suspend_flag || !ap_pending_requests()) { 473 schedule(); 474 try_to_freeze(); 475 } 476 set_current_state(TASK_RUNNING); 477 remove_wait_queue(&ap_poll_wait, &wait); 478 if (need_resched()) { 479 schedule(); 480 try_to_freeze(); 481 continue; 482 } 483 ap_tasklet_fn(0); 484 } 485 486 return 0; 487 } 488 489 static int ap_poll_thread_start(void) 490 { 491 int rc; 492 493 if (ap_using_interrupts() || ap_poll_kthread) 494 return 0; 495 mutex_lock(&ap_poll_thread_mutex); 496 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); 497 rc = PTR_ERR_OR_ZERO(ap_poll_kthread); 498 if (rc) 499 ap_poll_kthread = NULL; 500 mutex_unlock(&ap_poll_thread_mutex); 501 return rc; 502 } 503 504 static void ap_poll_thread_stop(void) 505 { 506 if (!ap_poll_kthread) 507 return; 508 mutex_lock(&ap_poll_thread_mutex); 509 kthread_stop(ap_poll_kthread); 510 ap_poll_kthread = NULL; 511 mutex_unlock(&ap_poll_thread_mutex); 512 } 513 514 #define is_card_dev(x) ((x)->parent == ap_root_device) 515 #define is_queue_dev(x) ((x)->parent != ap_root_device) 516 517 /** 518 * ap_bus_match() 519 * @dev: Pointer to device 520 * @drv: Pointer to device_driver 521 * 522 * AP bus driver registration/unregistration. 523 */ 524 static int ap_bus_match(struct device *dev, struct device_driver *drv) 525 { 526 struct ap_driver *ap_drv = to_ap_drv(drv); 527 struct ap_device_id *id; 528 529 /* 530 * Compare device type of the device with the list of 531 * supported types of the device_driver. 532 */ 533 for (id = ap_drv->ids; id->match_flags; id++) { 534 if (is_card_dev(dev) && 535 id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE && 536 id->dev_type == to_ap_dev(dev)->device_type) 537 return 1; 538 if (is_queue_dev(dev) && 539 id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE && 540 id->dev_type == to_ap_dev(dev)->device_type) 541 return 1; 542 } 543 return 0; 544 } 545 546 /** 547 * ap_uevent(): Uevent function for AP devices. 548 * @dev: Pointer to device 549 * @env: Pointer to kobj_uevent_env 550 * 551 * It sets up a single environment variable DEV_TYPE which contains the 552 * hardware device type. 553 */ 554 static int ap_uevent(struct device *dev, struct kobj_uevent_env *env) 555 { 556 struct ap_device *ap_dev = to_ap_dev(dev); 557 int retval = 0; 558 559 if (!ap_dev) 560 return -ENODEV; 561 562 /* Set up DEV_TYPE environment variable. */ 563 retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); 564 if (retval) 565 return retval; 566 567 /* Add MODALIAS= */ 568 retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); 569 570 return retval; 571 } 572 573 static int ap_dev_suspend(struct device *dev) 574 { 575 struct ap_device *ap_dev = to_ap_dev(dev); 576 577 if (ap_dev->drv && ap_dev->drv->suspend) 578 ap_dev->drv->suspend(ap_dev); 579 return 0; 580 } 581 582 static int ap_dev_resume(struct device *dev) 583 { 584 struct ap_device *ap_dev = to_ap_dev(dev); 585 586 if (ap_dev->drv && ap_dev->drv->resume) 587 ap_dev->drv->resume(ap_dev); 588 return 0; 589 } 590 591 static void ap_bus_suspend(void) 592 { 593 AP_DBF(DBF_DEBUG, "%s running\n", __func__); 594 595 ap_suspend_flag = 1; 596 /* 597 * Disable scanning for devices, thus we do not want to scan 598 * for them after removing. 599 */ 600 flush_work(&ap_scan_work); 601 tasklet_disable(&ap_tasklet); 602 } 603 604 static int __ap_card_devices_unregister(struct device *dev, void *dummy) 605 { 606 if (is_card_dev(dev)) 607 device_unregister(dev); 608 return 0; 609 } 610 611 static int __ap_queue_devices_unregister(struct device *dev, void *dummy) 612 { 613 if (is_queue_dev(dev)) 614 device_unregister(dev); 615 return 0; 616 } 617 618 static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data) 619 { 620 if (is_queue_dev(dev) && 621 AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long) data) 622 device_unregister(dev); 623 return 0; 624 } 625 626 static void ap_bus_resume(void) 627 { 628 int rc; 629 630 AP_DBF(DBF_DEBUG, "%s running\n", __func__); 631 632 /* remove all queue devices */ 633 bus_for_each_dev(&ap_bus_type, NULL, NULL, 634 __ap_queue_devices_unregister); 635 /* remove all card devices */ 636 bus_for_each_dev(&ap_bus_type, NULL, NULL, 637 __ap_card_devices_unregister); 638 639 /* Reset thin interrupt setting */ 640 if (ap_interrupts_available() && !ap_using_interrupts()) { 641 rc = register_adapter_interrupt(&ap_airq); 642 ap_airq_flag = (rc == 0); 643 } 644 if (!ap_interrupts_available() && ap_using_interrupts()) { 645 unregister_adapter_interrupt(&ap_airq); 646 ap_airq_flag = 0; 647 } 648 /* Reset domain */ 649 if (!user_set_domain) 650 ap_domain_index = -1; 651 /* Get things going again */ 652 ap_suspend_flag = 0; 653 if (ap_airq_flag) 654 xchg(ap_airq.lsi_ptr, 0); 655 tasklet_enable(&ap_tasklet); 656 queue_work(system_long_wq, &ap_scan_work); 657 } 658 659 static int ap_power_event(struct notifier_block *this, unsigned long event, 660 void *ptr) 661 { 662 switch (event) { 663 case PM_HIBERNATION_PREPARE: 664 case PM_SUSPEND_PREPARE: 665 ap_bus_suspend(); 666 break; 667 case PM_POST_HIBERNATION: 668 case PM_POST_SUSPEND: 669 ap_bus_resume(); 670 break; 671 default: 672 break; 673 } 674 return NOTIFY_DONE; 675 } 676 static struct notifier_block ap_power_notifier = { 677 .notifier_call = ap_power_event, 678 }; 679 680 static SIMPLE_DEV_PM_OPS(ap_bus_pm_ops, ap_dev_suspend, ap_dev_resume); 681 682 static struct bus_type ap_bus_type = { 683 .name = "ap", 684 .match = &ap_bus_match, 685 .uevent = &ap_uevent, 686 .pm = &ap_bus_pm_ops, 687 }; 688 689 static int __ap_revise_reserved(struct device *dev, void *dummy) 690 { 691 int rc, card, queue, devres, drvres; 692 693 if (is_queue_dev(dev)) { 694 card = AP_QID_CARD(to_ap_queue(dev)->qid); 695 queue = AP_QID_QUEUE(to_ap_queue(dev)->qid); 696 mutex_lock(&ap_perms_mutex); 697 devres = test_bit_inv(card, ap_perms.apm) 698 && test_bit_inv(queue, ap_perms.aqm); 699 mutex_unlock(&ap_perms_mutex); 700 drvres = to_ap_drv(dev->driver)->flags 701 & AP_DRIVER_FLAG_DEFAULT; 702 if (!!devres != !!drvres) { 703 AP_DBF(DBF_DEBUG, "reprobing queue=%02x.%04x\n", 704 card, queue); 705 rc = device_reprobe(dev); 706 } 707 } 708 709 return 0; 710 } 711 712 static void ap_bus_revise_bindings(void) 713 { 714 bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved); 715 } 716 717 int ap_owned_by_def_drv(int card, int queue) 718 { 719 int rc = 0; 720 721 if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS) 722 return -EINVAL; 723 724 mutex_lock(&ap_perms_mutex); 725 726 if (test_bit_inv(card, ap_perms.apm) 727 && test_bit_inv(queue, ap_perms.aqm)) 728 rc = 1; 729 730 mutex_unlock(&ap_perms_mutex); 731 732 return rc; 733 } 734 EXPORT_SYMBOL(ap_owned_by_def_drv); 735 736 int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, 737 unsigned long *aqm) 738 { 739 int card, queue, rc = 0; 740 741 mutex_lock(&ap_perms_mutex); 742 743 for (card = 0; !rc && card < AP_DEVICES; card++) 744 if (test_bit_inv(card, apm) && 745 test_bit_inv(card, ap_perms.apm)) 746 for (queue = 0; !rc && queue < AP_DOMAINS; queue++) 747 if (test_bit_inv(queue, aqm) && 748 test_bit_inv(queue, ap_perms.aqm)) 749 rc = 1; 750 751 mutex_unlock(&ap_perms_mutex); 752 753 return rc; 754 } 755 EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv); 756 757 static int ap_device_probe(struct device *dev) 758 { 759 struct ap_device *ap_dev = to_ap_dev(dev); 760 struct ap_driver *ap_drv = to_ap_drv(dev->driver); 761 int card, queue, devres, drvres, rc; 762 763 if (is_queue_dev(dev)) { 764 /* 765 * If the apqn is marked as reserved/used by ap bus and 766 * default drivers, only probe with drivers with the default 767 * flag set. If it is not marked, only probe with drivers 768 * with the default flag not set. 769 */ 770 card = AP_QID_CARD(to_ap_queue(dev)->qid); 771 queue = AP_QID_QUEUE(to_ap_queue(dev)->qid); 772 mutex_lock(&ap_perms_mutex); 773 devres = test_bit_inv(card, ap_perms.apm) 774 && test_bit_inv(queue, ap_perms.aqm); 775 mutex_unlock(&ap_perms_mutex); 776 drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT; 777 if (!!devres != !!drvres) 778 return -ENODEV; 779 /* (re-)init queue's state machine */ 780 ap_queue_reinit_state(to_ap_queue(dev)); 781 } 782 783 /* Add queue/card to list of active queues/cards */ 784 spin_lock_bh(&ap_list_lock); 785 if (is_card_dev(dev)) 786 list_add(&to_ap_card(dev)->list, &ap_card_list); 787 else 788 list_add(&to_ap_queue(dev)->list, 789 &to_ap_queue(dev)->card->queues); 790 spin_unlock_bh(&ap_list_lock); 791 792 ap_dev->drv = ap_drv; 793 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; 794 795 if (rc) { 796 spin_lock_bh(&ap_list_lock); 797 if (is_card_dev(dev)) 798 list_del_init(&to_ap_card(dev)->list); 799 else 800 list_del_init(&to_ap_queue(dev)->list); 801 spin_unlock_bh(&ap_list_lock); 802 ap_dev->drv = NULL; 803 } 804 805 return rc; 806 } 807 808 static int ap_device_remove(struct device *dev) 809 { 810 struct ap_device *ap_dev = to_ap_dev(dev); 811 struct ap_driver *ap_drv = ap_dev->drv; 812 813 if (is_queue_dev(dev)) 814 ap_queue_remove(to_ap_queue(dev)); 815 if (ap_drv->remove) 816 ap_drv->remove(ap_dev); 817 818 /* Remove queue/card from list of active queues/cards */ 819 spin_lock_bh(&ap_list_lock); 820 if (is_card_dev(dev)) 821 list_del_init(&to_ap_card(dev)->list); 822 else 823 list_del_init(&to_ap_queue(dev)->list); 824 spin_unlock_bh(&ap_list_lock); 825 826 return 0; 827 } 828 829 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, 830 char *name) 831 { 832 struct device_driver *drv = &ap_drv->driver; 833 834 if (!initialised) 835 return -ENODEV; 836 837 drv->bus = &ap_bus_type; 838 drv->probe = ap_device_probe; 839 drv->remove = ap_device_remove; 840 drv->owner = owner; 841 drv->name = name; 842 return driver_register(drv); 843 } 844 EXPORT_SYMBOL(ap_driver_register); 845 846 void ap_driver_unregister(struct ap_driver *ap_drv) 847 { 848 driver_unregister(&ap_drv->driver); 849 } 850 EXPORT_SYMBOL(ap_driver_unregister); 851 852 void ap_bus_force_rescan(void) 853 { 854 if (ap_suspend_flag) 855 return; 856 /* processing a asynchronous bus rescan */ 857 del_timer(&ap_config_timer); 858 queue_work(system_long_wq, &ap_scan_work); 859 flush_work(&ap_scan_work); 860 } 861 EXPORT_SYMBOL(ap_bus_force_rescan); 862 863 /* 864 * hex2bitmap() - parse hex mask string and set bitmap. 865 * Valid strings are "0x012345678" with at least one valid hex number. 866 * Rest of the bitmap to the right is padded with 0. No spaces allowed 867 * within the string, the leading 0x may be omitted. 868 * Returns the bitmask with exactly the bits set as given by the hex 869 * string (both in big endian order). 870 */ 871 static int hex2bitmap(const char *str, unsigned long *bitmap, int bits) 872 { 873 int i, n, b; 874 875 /* bits needs to be a multiple of 8 */ 876 if (bits & 0x07) 877 return -EINVAL; 878 879 if (str[0] == '0' && str[1] == 'x') 880 str++; 881 if (*str == 'x') 882 str++; 883 884 for (i = 0; isxdigit(*str) && i < bits; str++) { 885 b = hex_to_bin(*str); 886 for (n = 0; n < 4; n++) 887 if (b & (0x08 >> n)) 888 set_bit_inv(i + n, bitmap); 889 i += 4; 890 } 891 892 if (*str == '\n') 893 str++; 894 if (*str) 895 return -EINVAL; 896 return 0; 897 } 898 899 /* 900 * modify_bitmap() - parse bitmask argument and modify an existing 901 * bit mask accordingly. A concatenation (done with ',') of these 902 * terms is recognized: 903 * +<bitnr>[-<bitnr>] or -<bitnr>[-<bitnr>] 904 * <bitnr> may be any valid number (hex, decimal or octal) in the range 905 * 0...bits-1; the leading + or - is required. Here are some examples: 906 * +0-15,+32,-128,-0xFF 907 * -0-255,+1-16,+0x128 908 * +1,+2,+3,+4,-5,-7-10 909 * Returns the new bitmap after all changes have been applied. Every 910 * positive value in the string will set a bit and every negative value 911 * in the string will clear a bit. As a bit may be touched more than once, 912 * the last 'operation' wins: 913 * +0-255,-128 = first bits 0-255 will be set, then bit 128 will be 914 * cleared again. All other bits are unmodified. 915 */ 916 static int modify_bitmap(const char *str, unsigned long *bitmap, int bits) 917 { 918 int a, i, z; 919 char *np, sign; 920 921 /* bits needs to be a multiple of 8 */ 922 if (bits & 0x07) 923 return -EINVAL; 924 925 while (*str) { 926 sign = *str++; 927 if (sign != '+' && sign != '-') 928 return -EINVAL; 929 a = z = simple_strtoul(str, &np, 0); 930 if (str == np || a >= bits) 931 return -EINVAL; 932 str = np; 933 if (*str == '-') { 934 z = simple_strtoul(++str, &np, 0); 935 if (str == np || a > z || z >= bits) 936 return -EINVAL; 937 str = np; 938 } 939 for (i = a; i <= z; i++) 940 if (sign == '+') 941 set_bit_inv(i, bitmap); 942 else 943 clear_bit_inv(i, bitmap); 944 while (*str == ',' || *str == '\n') 945 str++; 946 } 947 948 return 0; 949 } 950 951 int ap_parse_mask_str(const char *str, 952 unsigned long *bitmap, int bits, 953 struct mutex *lock) 954 { 955 unsigned long *newmap, size; 956 int rc; 957 958 /* bits needs to be a multiple of 8 */ 959 if (bits & 0x07) 960 return -EINVAL; 961 962 size = BITS_TO_LONGS(bits)*sizeof(unsigned long); 963 newmap = kmalloc(size, GFP_KERNEL); 964 if (!newmap) 965 return -ENOMEM; 966 if (mutex_lock_interruptible(lock)) { 967 kfree(newmap); 968 return -ERESTARTSYS; 969 } 970 971 if (*str == '+' || *str == '-') { 972 memcpy(newmap, bitmap, size); 973 rc = modify_bitmap(str, newmap, bits); 974 } else { 975 memset(newmap, 0, size); 976 rc = hex2bitmap(str, newmap, bits); 977 } 978 if (rc == 0) 979 memcpy(bitmap, newmap, size); 980 mutex_unlock(lock); 981 kfree(newmap); 982 return rc; 983 } 984 EXPORT_SYMBOL(ap_parse_mask_str); 985 986 /* 987 * AP bus attributes. 988 */ 989 990 static ssize_t ap_domain_show(struct bus_type *bus, char *buf) 991 { 992 return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); 993 } 994 995 static ssize_t ap_domain_store(struct bus_type *bus, 996 const char *buf, size_t count) 997 { 998 int domain; 999 1000 if (sscanf(buf, "%i\n", &domain) != 1 || 1001 domain < 0 || domain > ap_max_domain_id || 1002 !test_bit_inv(domain, ap_perms.aqm)) 1003 return -EINVAL; 1004 spin_lock_bh(&ap_domain_lock); 1005 ap_domain_index = domain; 1006 spin_unlock_bh(&ap_domain_lock); 1007 1008 AP_DBF(DBF_DEBUG, "stored new default domain=%d\n", domain); 1009 1010 return count; 1011 } 1012 1013 static BUS_ATTR_RW(ap_domain); 1014 1015 static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) 1016 { 1017 if (!ap_configuration) /* QCI not supported */ 1018 return snprintf(buf, PAGE_SIZE, "not supported\n"); 1019 1020 return snprintf(buf, PAGE_SIZE, 1021 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", 1022 ap_configuration->adm[0], ap_configuration->adm[1], 1023 ap_configuration->adm[2], ap_configuration->adm[3], 1024 ap_configuration->adm[4], ap_configuration->adm[5], 1025 ap_configuration->adm[6], ap_configuration->adm[7]); 1026 } 1027 1028 static BUS_ATTR_RO(ap_control_domain_mask); 1029 1030 static ssize_t ap_usage_domain_mask_show(struct bus_type *bus, char *buf) 1031 { 1032 if (!ap_configuration) /* QCI not supported */ 1033 return snprintf(buf, PAGE_SIZE, "not supported\n"); 1034 1035 return snprintf(buf, PAGE_SIZE, 1036 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", 1037 ap_configuration->aqm[0], ap_configuration->aqm[1], 1038 ap_configuration->aqm[2], ap_configuration->aqm[3], 1039 ap_configuration->aqm[4], ap_configuration->aqm[5], 1040 ap_configuration->aqm[6], ap_configuration->aqm[7]); 1041 } 1042 1043 static BUS_ATTR_RO(ap_usage_domain_mask); 1044 1045 static ssize_t ap_adapter_mask_show(struct bus_type *bus, char *buf) 1046 { 1047 if (!ap_configuration) /* QCI not supported */ 1048 return snprintf(buf, PAGE_SIZE, "not supported\n"); 1049 1050 return snprintf(buf, PAGE_SIZE, 1051 "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", 1052 ap_configuration->apm[0], ap_configuration->apm[1], 1053 ap_configuration->apm[2], ap_configuration->apm[3], 1054 ap_configuration->apm[4], ap_configuration->apm[5], 1055 ap_configuration->apm[6], ap_configuration->apm[7]); 1056 } 1057 1058 static BUS_ATTR_RO(ap_adapter_mask); 1059 1060 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) 1061 { 1062 return snprintf(buf, PAGE_SIZE, "%d\n", 1063 ap_using_interrupts() ? 1 : 0); 1064 } 1065 1066 static BUS_ATTR_RO(ap_interrupts); 1067 1068 static ssize_t config_time_show(struct bus_type *bus, char *buf) 1069 { 1070 return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); 1071 } 1072 1073 static ssize_t config_time_store(struct bus_type *bus, 1074 const char *buf, size_t count) 1075 { 1076 int time; 1077 1078 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) 1079 return -EINVAL; 1080 ap_config_time = time; 1081 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); 1082 return count; 1083 } 1084 1085 static BUS_ATTR_RW(config_time); 1086 1087 static ssize_t poll_thread_show(struct bus_type *bus, char *buf) 1088 { 1089 return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); 1090 } 1091 1092 static ssize_t poll_thread_store(struct bus_type *bus, 1093 const char *buf, size_t count) 1094 { 1095 int flag, rc; 1096 1097 if (sscanf(buf, "%d\n", &flag) != 1) 1098 return -EINVAL; 1099 if (flag) { 1100 rc = ap_poll_thread_start(); 1101 if (rc) 1102 count = rc; 1103 } else 1104 ap_poll_thread_stop(); 1105 return count; 1106 } 1107 1108 static BUS_ATTR_RW(poll_thread); 1109 1110 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) 1111 { 1112 return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); 1113 } 1114 1115 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, 1116 size_t count) 1117 { 1118 unsigned long long time; 1119 ktime_t hr_time; 1120 1121 /* 120 seconds = maximum poll interval */ 1122 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || 1123 time > 120000000000ULL) 1124 return -EINVAL; 1125 poll_timeout = time; 1126 hr_time = poll_timeout; 1127 1128 spin_lock_bh(&ap_poll_timer_lock); 1129 hrtimer_cancel(&ap_poll_timer); 1130 hrtimer_set_expires(&ap_poll_timer, hr_time); 1131 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); 1132 spin_unlock_bh(&ap_poll_timer_lock); 1133 1134 return count; 1135 } 1136 1137 static BUS_ATTR_RW(poll_timeout); 1138 1139 static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) 1140 { 1141 int max_domain_id; 1142 1143 if (ap_configuration) 1144 max_domain_id = ap_max_domain_id ? : -1; 1145 else 1146 max_domain_id = 15; 1147 return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); 1148 } 1149 1150 static BUS_ATTR_RO(ap_max_domain_id); 1151 1152 static ssize_t apmask_show(struct bus_type *bus, char *buf) 1153 { 1154 int rc; 1155 1156 if (mutex_lock_interruptible(&ap_perms_mutex)) 1157 return -ERESTARTSYS; 1158 rc = snprintf(buf, PAGE_SIZE, 1159 "0x%016lx%016lx%016lx%016lx\n", 1160 ap_perms.apm[0], ap_perms.apm[1], 1161 ap_perms.apm[2], ap_perms.apm[3]); 1162 mutex_unlock(&ap_perms_mutex); 1163 1164 return rc; 1165 } 1166 1167 static ssize_t apmask_store(struct bus_type *bus, const char *buf, 1168 size_t count) 1169 { 1170 int rc; 1171 1172 rc = ap_parse_mask_str(buf, ap_perms.apm, AP_DEVICES, &ap_perms_mutex); 1173 if (rc) 1174 return rc; 1175 1176 ap_bus_revise_bindings(); 1177 1178 return count; 1179 } 1180 1181 static BUS_ATTR_RW(apmask); 1182 1183 static ssize_t aqmask_show(struct bus_type *bus, char *buf) 1184 { 1185 int rc; 1186 1187 if (mutex_lock_interruptible(&ap_perms_mutex)) 1188 return -ERESTARTSYS; 1189 rc = snprintf(buf, PAGE_SIZE, 1190 "0x%016lx%016lx%016lx%016lx\n", 1191 ap_perms.aqm[0], ap_perms.aqm[1], 1192 ap_perms.aqm[2], ap_perms.aqm[3]); 1193 mutex_unlock(&ap_perms_mutex); 1194 1195 return rc; 1196 } 1197 1198 static ssize_t aqmask_store(struct bus_type *bus, const char *buf, 1199 size_t count) 1200 { 1201 int rc; 1202 1203 rc = ap_parse_mask_str(buf, ap_perms.aqm, AP_DOMAINS, &ap_perms_mutex); 1204 if (rc) 1205 return rc; 1206 1207 ap_bus_revise_bindings(); 1208 1209 return count; 1210 } 1211 1212 static BUS_ATTR_RW(aqmask); 1213 1214 static struct bus_attribute *const ap_bus_attrs[] = { 1215 &bus_attr_ap_domain, 1216 &bus_attr_ap_control_domain_mask, 1217 &bus_attr_ap_usage_domain_mask, 1218 &bus_attr_ap_adapter_mask, 1219 &bus_attr_config_time, 1220 &bus_attr_poll_thread, 1221 &bus_attr_ap_interrupts, 1222 &bus_attr_poll_timeout, 1223 &bus_attr_ap_max_domain_id, 1224 &bus_attr_apmask, 1225 &bus_attr_aqmask, 1226 NULL, 1227 }; 1228 1229 /** 1230 * ap_select_domain(): Select an AP domain if possible and we haven't 1231 * already done so before. 1232 */ 1233 static void ap_select_domain(void) 1234 { 1235 int count, max_count, best_domain; 1236 struct ap_queue_status status; 1237 int i, j; 1238 1239 /* 1240 * We want to use a single domain. Either the one specified with 1241 * the "domain=" parameter or the domain with the maximum number 1242 * of devices. 1243 */ 1244 spin_lock_bh(&ap_domain_lock); 1245 if (ap_domain_index >= 0) { 1246 /* Domain has already been selected. */ 1247 spin_unlock_bh(&ap_domain_lock); 1248 return; 1249 } 1250 best_domain = -1; 1251 max_count = 0; 1252 for (i = 0; i < AP_DOMAINS; i++) { 1253 if (!ap_test_config_domain(i) || 1254 !test_bit_inv(i, ap_perms.aqm)) 1255 continue; 1256 count = 0; 1257 for (j = 0; j < AP_DEVICES; j++) { 1258 if (!ap_test_config_card_id(j)) 1259 continue; 1260 status = ap_test_queue(AP_MKQID(j, i), 1261 ap_apft_available(), 1262 NULL); 1263 if (status.response_code != AP_RESPONSE_NORMAL) 1264 continue; 1265 count++; 1266 } 1267 if (count > max_count) { 1268 max_count = count; 1269 best_domain = i; 1270 } 1271 } 1272 if (best_domain >= 0) { 1273 ap_domain_index = best_domain; 1274 AP_DBF(DBF_DEBUG, "new ap_domain_index=%d\n", ap_domain_index); 1275 } 1276 spin_unlock_bh(&ap_domain_lock); 1277 } 1278 1279 /* 1280 * This function checks the type and returns either 0 for not 1281 * supported or the highest compatible type value (which may 1282 * include the input type value). 1283 */ 1284 static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func) 1285 { 1286 int comp_type = 0; 1287 1288 /* < CEX2A is not supported */ 1289 if (rawtype < AP_DEVICE_TYPE_CEX2A) 1290 return 0; 1291 /* up to CEX6 known and fully supported */ 1292 if (rawtype <= AP_DEVICE_TYPE_CEX6) 1293 return rawtype; 1294 /* 1295 * unknown new type > CEX6, check for compatibility 1296 * to the highest known and supported type which is 1297 * currently CEX6 with the help of the QACT function. 1298 */ 1299 if (ap_qact_available()) { 1300 struct ap_queue_status status; 1301 union ap_qact_ap_info apinfo = {0}; 1302 1303 apinfo.mode = (func >> 26) & 0x07; 1304 apinfo.cat = AP_DEVICE_TYPE_CEX6; 1305 status = ap_qact(qid, 0, &apinfo); 1306 if (status.response_code == AP_RESPONSE_NORMAL 1307 && apinfo.cat >= AP_DEVICE_TYPE_CEX2A 1308 && apinfo.cat <= AP_DEVICE_TYPE_CEX6) 1309 comp_type = apinfo.cat; 1310 } 1311 if (!comp_type) 1312 AP_DBF(DBF_WARN, "queue=%02x.%04x unable to map type %d\n", 1313 AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype); 1314 else if (comp_type != rawtype) 1315 AP_DBF(DBF_INFO, "queue=%02x.%04x map type %d to %d\n", 1316 AP_QID_CARD(qid), AP_QID_QUEUE(qid), rawtype, comp_type); 1317 return comp_type; 1318 } 1319 1320 /* 1321 * Helper function to be used with bus_find_dev 1322 * matches for the card device with the given id 1323 */ 1324 static int __match_card_device_with_id(struct device *dev, void *data) 1325 { 1326 return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long) data; 1327 } 1328 1329 /* 1330 * Helper function to be used with bus_find_dev 1331 * matches for the queue device with a given qid 1332 */ 1333 static int __match_queue_device_with_qid(struct device *dev, void *data) 1334 { 1335 return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long) data; 1336 } 1337 1338 /* 1339 * Helper function to be used with bus_find_dev 1340 * matches any queue device with given queue id 1341 */ 1342 static int __match_queue_device_with_queue_id(struct device *dev, void *data) 1343 { 1344 return is_queue_dev(dev) 1345 && AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long) data; 1346 } 1347 1348 /* 1349 * Helper function for ap_scan_bus(). 1350 * Does the scan bus job for the given adapter id. 1351 */ 1352 static void _ap_scan_bus_adapter(int id) 1353 { 1354 ap_qid_t qid; 1355 unsigned int func; 1356 struct ap_card *ac; 1357 struct device *dev; 1358 struct ap_queue *aq; 1359 int rc, dom, depth, type, comp_type, borked; 1360 1361 /* check if there is a card device registered with this id */ 1362 dev = bus_find_device(&ap_bus_type, NULL, 1363 (void *)(long) id, 1364 __match_card_device_with_id); 1365 ac = dev ? to_ap_card(dev) : NULL; 1366 if (!ap_test_config_card_id(id)) { 1367 if (dev) { 1368 /* Card device has been removed from configuration */ 1369 bus_for_each_dev(&ap_bus_type, NULL, 1370 (void *)(long) id, 1371 __ap_queue_devices_with_id_unregister); 1372 device_unregister(dev); 1373 put_device(dev); 1374 } 1375 return; 1376 } 1377 1378 /* 1379 * This card id is enabled in the configuration. If we already have 1380 * a card device with this id, check if type and functions are still 1381 * the very same. Also verify that at least one queue is available. 1382 */ 1383 if (ac) { 1384 /* find the first valid queue */ 1385 for (dom = 0; dom < AP_DOMAINS; dom++) { 1386 qid = AP_MKQID(id, dom); 1387 if (ap_query_queue(qid, &depth, &type, &func) == 0) 1388 break; 1389 } 1390 borked = 0; 1391 if (dom >= AP_DOMAINS) { 1392 /* no accessible queue on this card */ 1393 borked = 1; 1394 } else if (ac->raw_hwtype != type) { 1395 /* card type has changed */ 1396 AP_DBF(DBF_INFO, "card=%02x type changed.\n", id); 1397 borked = 1; 1398 } else if (ac->functions != func) { 1399 /* card functions have changed */ 1400 AP_DBF(DBF_INFO, "card=%02x functions changed.\n", id); 1401 borked = 1; 1402 } 1403 if (borked) { 1404 /* unregister card device and associated queues */ 1405 bus_for_each_dev(&ap_bus_type, NULL, 1406 (void *)(long) id, 1407 __ap_queue_devices_with_id_unregister); 1408 device_unregister(dev); 1409 put_device(dev); 1410 /* go back if there is no valid queue on this card */ 1411 if (dom >= AP_DOMAINS) 1412 return; 1413 ac = NULL; 1414 } 1415 } 1416 1417 /* 1418 * Go through all possible queue ids. Check and maybe create or release 1419 * queue devices for this card. If there exists no card device yet, 1420 * create a card device also. 1421 */ 1422 for (dom = 0; dom < AP_DOMAINS; dom++) { 1423 qid = AP_MKQID(id, dom); 1424 dev = bus_find_device(&ap_bus_type, NULL, 1425 (void *)(long) qid, 1426 __match_queue_device_with_qid); 1427 aq = dev ? to_ap_queue(dev) : NULL; 1428 if (!ap_test_config_domain(dom)) { 1429 if (dev) { 1430 /* Queue device exists but has been 1431 * removed from configuration. 1432 */ 1433 device_unregister(dev); 1434 put_device(dev); 1435 } 1436 continue; 1437 } 1438 /* try to fetch infos about this queue */ 1439 rc = ap_query_queue(qid, &depth, &type, &func); 1440 if (dev) { 1441 if (rc == -ENODEV) 1442 borked = 1; 1443 else { 1444 spin_lock_bh(&aq->lock); 1445 borked = aq->state == AP_STATE_BORKED; 1446 spin_unlock_bh(&aq->lock); 1447 } 1448 if (borked) { 1449 /* Remove broken device */ 1450 AP_DBF(DBF_DEBUG, 1451 "removing broken queue=%02x.%04x\n", 1452 id, dom); 1453 device_unregister(dev); 1454 } 1455 put_device(dev); 1456 continue; 1457 } 1458 if (rc) 1459 continue; 1460 /* a new queue device is needed, check out comp type */ 1461 comp_type = ap_get_compatible_type(qid, type, func); 1462 if (!comp_type) 1463 continue; 1464 /* maybe a card device needs to be created first */ 1465 if (!ac) { 1466 ac = ap_card_create(id, depth, type, comp_type, func); 1467 if (!ac) 1468 continue; 1469 ac->ap_dev.device.bus = &ap_bus_type; 1470 ac->ap_dev.device.parent = ap_root_device; 1471 dev_set_name(&ac->ap_dev.device, "card%02x", id); 1472 /* Register card device with AP bus */ 1473 rc = device_register(&ac->ap_dev.device); 1474 if (rc) { 1475 put_device(&ac->ap_dev.device); 1476 ac = NULL; 1477 break; 1478 } 1479 /* get it and thus adjust reference counter */ 1480 get_device(&ac->ap_dev.device); 1481 } 1482 /* now create the new queue device */ 1483 aq = ap_queue_create(qid, comp_type); 1484 if (!aq) 1485 continue; 1486 aq->card = ac; 1487 aq->ap_dev.device.bus = &ap_bus_type; 1488 aq->ap_dev.device.parent = &ac->ap_dev.device; 1489 dev_set_name(&aq->ap_dev.device, "%02x.%04x", id, dom); 1490 /* Register queue device */ 1491 rc = device_register(&aq->ap_dev.device); 1492 if (rc) { 1493 put_device(&aq->ap_dev.device); 1494 continue; 1495 } 1496 } /* end domain loop */ 1497 1498 if (ac) 1499 put_device(&ac->ap_dev.device); 1500 } 1501 1502 /** 1503 * ap_scan_bus(): Scan the AP bus for new devices 1504 * Runs periodically, workqueue timer (ap_config_time) 1505 */ 1506 static void ap_scan_bus(struct work_struct *unused) 1507 { 1508 int id; 1509 1510 AP_DBF(DBF_DEBUG, "%s running\n", __func__); 1511 1512 ap_query_configuration(ap_configuration); 1513 ap_select_domain(); 1514 1515 /* loop over all possible adapters */ 1516 for (id = 0; id < AP_DEVICES; id++) 1517 _ap_scan_bus_adapter(id); 1518 1519 /* check if there is at least one queue available with default domain */ 1520 if (ap_domain_index >= 0) { 1521 struct device *dev = 1522 bus_find_device(&ap_bus_type, NULL, 1523 (void *)(long) ap_domain_index, 1524 __match_queue_device_with_queue_id); 1525 if (dev) 1526 put_device(dev); 1527 else 1528 AP_DBF(DBF_INFO, 1529 "no queue device with default domain %d available\n", 1530 ap_domain_index); 1531 } 1532 1533 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); 1534 } 1535 1536 static void ap_config_timeout(struct timer_list *unused) 1537 { 1538 if (ap_suspend_flag) 1539 return; 1540 queue_work(system_long_wq, &ap_scan_work); 1541 } 1542 1543 static int __init ap_debug_init(void) 1544 { 1545 ap_dbf_info = debug_register("ap", 1, 1, 1546 DBF_MAX_SPRINTF_ARGS * sizeof(long)); 1547 debug_register_view(ap_dbf_info, &debug_sprintf_view); 1548 debug_set_level(ap_dbf_info, DBF_ERR); 1549 1550 return 0; 1551 } 1552 1553 static void __init ap_perms_init(void) 1554 { 1555 /* all resources useable if no kernel parameter string given */ 1556 memset(&ap_perms.ioctlm, 0xFF, sizeof(ap_perms.ioctlm)); 1557 memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm)); 1558 memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm)); 1559 1560 /* apm kernel parameter string */ 1561 if (apm_str) { 1562 memset(&ap_perms.apm, 0, sizeof(ap_perms.apm)); 1563 ap_parse_mask_str(apm_str, ap_perms.apm, AP_DEVICES, 1564 &ap_perms_mutex); 1565 } 1566 1567 /* aqm kernel parameter string */ 1568 if (aqm_str) { 1569 memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm)); 1570 ap_parse_mask_str(aqm_str, ap_perms.aqm, AP_DOMAINS, 1571 &ap_perms_mutex); 1572 } 1573 } 1574 1575 /** 1576 * ap_module_init(): The module initialization code. 1577 * 1578 * Initializes the module. 1579 */ 1580 static int __init ap_module_init(void) 1581 { 1582 int max_domain_id; 1583 int rc, i; 1584 1585 rc = ap_debug_init(); 1586 if (rc) 1587 return rc; 1588 1589 if (!ap_instructions_available()) { 1590 pr_warn("The hardware system does not support AP instructions\n"); 1591 return -ENODEV; 1592 } 1593 1594 /* set up the AP permissions (ioctls, ap and aq masks) */ 1595 ap_perms_init(); 1596 1597 /* Get AP configuration data if available */ 1598 ap_init_configuration(); 1599 1600 if (ap_configuration) 1601 max_domain_id = 1602 ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1; 1603 else 1604 max_domain_id = 15; 1605 if (ap_domain_index < -1 || ap_domain_index > max_domain_id || 1606 (ap_domain_index >= 0 && 1607 !test_bit_inv(ap_domain_index, ap_perms.aqm))) { 1608 pr_warn("%d is not a valid cryptographic domain\n", 1609 ap_domain_index); 1610 ap_domain_index = -1; 1611 } 1612 /* In resume callback we need to know if the user had set the domain. 1613 * If so, we can not just reset it. 1614 */ 1615 if (ap_domain_index >= 0) 1616 user_set_domain = 1; 1617 1618 if (ap_interrupts_available()) { 1619 rc = register_adapter_interrupt(&ap_airq); 1620 ap_airq_flag = (rc == 0); 1621 } 1622 1623 /* Create /sys/bus/ap. */ 1624 rc = bus_register(&ap_bus_type); 1625 if (rc) 1626 goto out; 1627 for (i = 0; ap_bus_attrs[i]; i++) { 1628 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); 1629 if (rc) 1630 goto out_bus; 1631 } 1632 1633 /* Create /sys/devices/ap. */ 1634 ap_root_device = root_device_register("ap"); 1635 rc = PTR_ERR_OR_ZERO(ap_root_device); 1636 if (rc) 1637 goto out_bus; 1638 1639 /* Setup the AP bus rescan timer. */ 1640 timer_setup(&ap_config_timer, ap_config_timeout, 0); 1641 1642 /* 1643 * Setup the high resultion poll timer. 1644 * If we are running under z/VM adjust polling to z/VM polling rate. 1645 */ 1646 if (MACHINE_IS_VM) 1647 poll_timeout = 1500000; 1648 spin_lock_init(&ap_poll_timer_lock); 1649 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 1650 ap_poll_timer.function = ap_poll_timeout; 1651 1652 /* Start the low priority AP bus poll thread. */ 1653 if (ap_thread_flag) { 1654 rc = ap_poll_thread_start(); 1655 if (rc) 1656 goto out_work; 1657 } 1658 1659 rc = register_pm_notifier(&ap_power_notifier); 1660 if (rc) 1661 goto out_pm; 1662 1663 queue_work(system_long_wq, &ap_scan_work); 1664 initialised = true; 1665 1666 return 0; 1667 1668 out_pm: 1669 ap_poll_thread_stop(); 1670 out_work: 1671 hrtimer_cancel(&ap_poll_timer); 1672 root_device_unregister(ap_root_device); 1673 out_bus: 1674 while (i--) 1675 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); 1676 bus_unregister(&ap_bus_type); 1677 out: 1678 if (ap_using_interrupts()) 1679 unregister_adapter_interrupt(&ap_airq); 1680 kfree(ap_configuration); 1681 return rc; 1682 } 1683 device_initcall(ap_module_init); 1684