1 /* 2 * Copyright IBM Corp. 2006, 2012 3 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 4 * Martin Schwidefsky <schwidefsky@de.ibm.com> 5 * Ralph Wuerthner <rwuerthn@de.ibm.com> 6 * Felix Beck <felix.beck@de.ibm.com> 7 * Holger Dengler <hd@linux.vnet.ibm.com> 8 * 9 * Adjunct processor bus. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2, or (at your option) 14 * any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26 #define KMSG_COMPONENT "ap" 27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 28 29 #include <linux/kernel_stat.h> 30 #include <linux/module.h> 31 #include <linux/init.h> 32 #include <linux/delay.h> 33 #include <linux/err.h> 34 #include <linux/interrupt.h> 35 #include <linux/workqueue.h> 36 #include <linux/slab.h> 37 #include <linux/notifier.h> 38 #include <linux/kthread.h> 39 #include <linux/mutex.h> 40 #include <asm/reset.h> 41 #include <asm/airq.h> 42 #include <linux/atomic.h> 43 #include <asm/isc.h> 44 #include <linux/hrtimer.h> 45 #include <linux/ktime.h> 46 #include <asm/facility.h> 47 48 #include "ap_bus.h" 49 50 /* Some prototypes. */ 51 static void ap_scan_bus(struct work_struct *); 52 static void ap_poll_all(unsigned long); 53 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *); 54 static int ap_poll_thread_start(void); 55 static void ap_poll_thread_stop(void); 56 static void ap_request_timeout(unsigned long); 57 static inline void ap_schedule_poll_timer(void); 58 static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags); 59 static int ap_device_remove(struct device *dev); 60 static int ap_device_probe(struct device *dev); 61 static void ap_interrupt_handler(void *unused1, void *unused2); 62 static void ap_reset(struct ap_device *ap_dev); 63 static void ap_config_timeout(unsigned long ptr); 64 static int ap_select_domain(void); 65 static void ap_query_configuration(void); 66 67 /* 68 * Module description. 69 */ 70 MODULE_AUTHOR("IBM Corporation"); 71 MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \ 72 "Copyright IBM Corp. 2006, 2012"); 73 MODULE_LICENSE("GPL"); 74 75 /* 76 * Module parameter 77 */ 78 int ap_domain_index = -1; /* Adjunct Processor Domain Index */ 79 module_param_named(domain, ap_domain_index, int, 0000); 80 MODULE_PARM_DESC(domain, "domain index for ap devices"); 81 EXPORT_SYMBOL(ap_domain_index); 82 83 static int ap_thread_flag = 0; 84 module_param_named(poll_thread, ap_thread_flag, int, 0000); 85 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); 86 87 static struct device *ap_root_device = NULL; 88 static struct ap_config_info *ap_configuration; 89 static DEFINE_SPINLOCK(ap_device_list_lock); 90 static LIST_HEAD(ap_device_list); 91 92 /* 93 * Workqueue & timer for bus rescan. 94 */ 95 static struct workqueue_struct *ap_work_queue; 96 static struct timer_list ap_config_timer; 97 static int ap_config_time = AP_CONFIG_TIME; 98 static DECLARE_WORK(ap_config_work, ap_scan_bus); 99 100 /* 101 * Tasklet & timer for AP request polling and interrupts 102 */ 103 static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0); 104 static atomic_t ap_poll_requests = ATOMIC_INIT(0); 105 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); 106 static struct task_struct *ap_poll_kthread = NULL; 107 static DEFINE_MUTEX(ap_poll_thread_mutex); 108 static DEFINE_SPINLOCK(ap_poll_timer_lock); 109 static void *ap_interrupt_indicator; 110 static struct hrtimer ap_poll_timer; 111 /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. 112 * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ 113 static unsigned long long poll_timeout = 250000; 114 115 /* Suspend flag */ 116 static int ap_suspend_flag; 117 /* Flag to check if domain was set through module parameter domain=. This is 118 * important when supsend and resume is done in a z/VM environment where the 119 * domain might change. */ 120 static int user_set_domain = 0; 121 static struct bus_type ap_bus_type; 122 123 /** 124 * ap_using_interrupts() - Returns non-zero if interrupt support is 125 * available. 126 */ 127 static inline int ap_using_interrupts(void) 128 { 129 return ap_interrupt_indicator != NULL; 130 } 131 132 /** 133 * ap_intructions_available() - Test if AP instructions are available. 134 * 135 * Returns 0 if the AP instructions are installed. 136 */ 137 static inline int ap_instructions_available(void) 138 { 139 register unsigned long reg0 asm ("0") = AP_MKQID(0,0); 140 register unsigned long reg1 asm ("1") = -ENODEV; 141 register unsigned long reg2 asm ("2") = 0UL; 142 143 asm volatile( 144 " .long 0xb2af0000\n" /* PQAP(TAPQ) */ 145 "0: la %1,0\n" 146 "1:\n" 147 EX_TABLE(0b, 1b) 148 : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); 149 return reg1; 150 } 151 152 /** 153 * ap_interrupts_available(): Test if AP interrupts are available. 154 * 155 * Returns 1 if AP interrupts are available. 156 */ 157 static int ap_interrupts_available(void) 158 { 159 return test_facility(2) && test_facility(65); 160 } 161 162 /** 163 * ap_configuration_available(): Test if AP configuration 164 * information is available. 165 * 166 * Returns 1 if AP configuration information is available. 167 */ 168 #ifdef CONFIG_64BIT 169 static int ap_configuration_available(void) 170 { 171 return test_facility(2) && test_facility(12); 172 } 173 #endif 174 175 /** 176 * ap_test_queue(): Test adjunct processor queue. 177 * @qid: The AP queue number 178 * @queue_depth: Pointer to queue depth value 179 * @device_type: Pointer to device type value 180 * 181 * Returns AP queue status structure. 182 */ 183 static inline struct ap_queue_status 184 ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type) 185 { 186 register unsigned long reg0 asm ("0") = qid; 187 register struct ap_queue_status reg1 asm ("1"); 188 register unsigned long reg2 asm ("2") = 0UL; 189 190 asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ 191 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); 192 *device_type = (int) (reg2 >> 24); 193 *queue_depth = (int) (reg2 & 0xff); 194 return reg1; 195 } 196 197 /** 198 * ap_reset_queue(): Reset adjunct processor queue. 199 * @qid: The AP queue number 200 * 201 * Returns AP queue status structure. 202 */ 203 static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) 204 { 205 register unsigned long reg0 asm ("0") = qid | 0x01000000UL; 206 register struct ap_queue_status reg1 asm ("1"); 207 register unsigned long reg2 asm ("2") = 0UL; 208 209 asm volatile( 210 ".long 0xb2af0000" /* PQAP(RAPQ) */ 211 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); 212 return reg1; 213 } 214 215 #ifdef CONFIG_64BIT 216 /** 217 * ap_queue_interruption_control(): Enable interruption for a specific AP. 218 * @qid: The AP queue number 219 * @ind: The notification indicator byte 220 * 221 * Returns AP queue status. 222 */ 223 static inline struct ap_queue_status 224 ap_queue_interruption_control(ap_qid_t qid, void *ind) 225 { 226 register unsigned long reg0 asm ("0") = qid | 0x03000000UL; 227 register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; 228 register struct ap_queue_status reg1_out asm ("1"); 229 register void *reg2 asm ("2") = ind; 230 asm volatile( 231 ".long 0xb2af0000" /* PQAP(AQIC) */ 232 : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) 233 : 234 : "cc" ); 235 return reg1_out; 236 } 237 #endif 238 239 #ifdef CONFIG_64BIT 240 static inline struct ap_queue_status 241 __ap_query_functions(ap_qid_t qid, unsigned int *functions) 242 { 243 register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23); 244 register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID; 245 register unsigned long reg2 asm ("2"); 246 247 asm volatile( 248 ".long 0xb2af0000\n" /* PQAP(TAPQ) */ 249 "0:\n" 250 EX_TABLE(0b, 0b) 251 : "+d" (reg0), "+d" (reg1), "=d" (reg2) 252 : 253 : "cc"); 254 255 *functions = (unsigned int)(reg2 >> 32); 256 return reg1; 257 } 258 #endif 259 260 #ifdef CONFIG_64BIT 261 static inline int __ap_query_configuration(struct ap_config_info *config) 262 { 263 register unsigned long reg0 asm ("0") = 0x04000000UL; 264 register unsigned long reg1 asm ("1") = -EINVAL; 265 register unsigned char *reg2 asm ("2") = (unsigned char *)config; 266 267 asm volatile( 268 ".long 0xb2af0000\n" /* PQAP(QCI) */ 269 "0: la %1,0\n" 270 "1:\n" 271 EX_TABLE(0b, 1b) 272 : "+d" (reg0), "+d" (reg1), "+d" (reg2) 273 : 274 : "cc"); 275 276 return reg1; 277 } 278 #endif 279 280 /** 281 * ap_query_functions(): Query supported functions. 282 * @qid: The AP queue number 283 * @functions: Pointer to functions field. 284 * 285 * Returns 286 * 0 on success. 287 * -ENODEV if queue not valid. 288 * -EBUSY if device busy. 289 * -EINVAL if query function is not supported 290 */ 291 static int ap_query_functions(ap_qid_t qid, unsigned int *functions) 292 { 293 #ifdef CONFIG_64BIT 294 struct ap_queue_status status; 295 int i; 296 status = __ap_query_functions(qid, functions); 297 298 for (i = 0; i < AP_MAX_RESET; i++) { 299 if (ap_queue_status_invalid_test(&status)) 300 return -ENODEV; 301 302 switch (status.response_code) { 303 case AP_RESPONSE_NORMAL: 304 return 0; 305 case AP_RESPONSE_RESET_IN_PROGRESS: 306 case AP_RESPONSE_BUSY: 307 break; 308 case AP_RESPONSE_Q_NOT_AVAIL: 309 case AP_RESPONSE_DECONFIGURED: 310 case AP_RESPONSE_CHECKSTOPPED: 311 case AP_RESPONSE_INVALID_ADDRESS: 312 return -ENODEV; 313 case AP_RESPONSE_OTHERWISE_CHANGED: 314 break; 315 default: 316 break; 317 } 318 if (i < AP_MAX_RESET - 1) { 319 udelay(5); 320 status = __ap_query_functions(qid, functions); 321 } 322 } 323 return -EBUSY; 324 #else 325 return -EINVAL; 326 #endif 327 } 328 329 /** 330 * ap_queue_enable_interruption(): Enable interruption on an AP. 331 * @qid: The AP queue number 332 * @ind: the notification indicator byte 333 * 334 * Enables interruption on AP queue via ap_queue_interruption_control(). Based 335 * on the return value it waits a while and tests the AP queue if interrupts 336 * have been switched on using ap_test_queue(). 337 */ 338 static int ap_queue_enable_interruption(ap_qid_t qid, void *ind) 339 { 340 #ifdef CONFIG_64BIT 341 struct ap_queue_status status; 342 int t_depth, t_device_type, rc, i; 343 344 rc = -EBUSY; 345 status = ap_queue_interruption_control(qid, ind); 346 347 for (i = 0; i < AP_MAX_RESET; i++) { 348 switch (status.response_code) { 349 case AP_RESPONSE_NORMAL: 350 if (status.int_enabled) 351 return 0; 352 break; 353 case AP_RESPONSE_RESET_IN_PROGRESS: 354 case AP_RESPONSE_BUSY: 355 if (i < AP_MAX_RESET - 1) { 356 udelay(5); 357 status = ap_queue_interruption_control(qid, 358 ind); 359 continue; 360 } 361 break; 362 case AP_RESPONSE_Q_NOT_AVAIL: 363 case AP_RESPONSE_DECONFIGURED: 364 case AP_RESPONSE_CHECKSTOPPED: 365 case AP_RESPONSE_INVALID_ADDRESS: 366 return -ENODEV; 367 case AP_RESPONSE_OTHERWISE_CHANGED: 368 if (status.int_enabled) 369 return 0; 370 break; 371 default: 372 break; 373 } 374 if (i < AP_MAX_RESET - 1) { 375 udelay(5); 376 status = ap_test_queue(qid, &t_depth, &t_device_type); 377 } 378 } 379 return rc; 380 #else 381 return -EINVAL; 382 #endif 383 } 384 385 /** 386 * __ap_send(): Send message to adjunct processor queue. 387 * @qid: The AP queue number 388 * @psmid: The program supplied message identifier 389 * @msg: The message text 390 * @length: The message length 391 * @special: Special Bit 392 * 393 * Returns AP queue status structure. 394 * Condition code 1 on NQAP can't happen because the L bit is 1. 395 * Condition code 2 on NQAP also means the send is incomplete, 396 * because a segment boundary was reached. The NQAP is repeated. 397 */ 398 static inline struct ap_queue_status 399 __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, 400 unsigned int special) 401 { 402 typedef struct { char _[length]; } msgblock; 403 register unsigned long reg0 asm ("0") = qid | 0x40000000UL; 404 register struct ap_queue_status reg1 asm ("1"); 405 register unsigned long reg2 asm ("2") = (unsigned long) msg; 406 register unsigned long reg3 asm ("3") = (unsigned long) length; 407 register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); 408 register unsigned long reg5 asm ("5") = (unsigned int) psmid; 409 410 if (special == 1) 411 reg0 |= 0x400000UL; 412 413 asm volatile ( 414 "0: .long 0xb2ad0042\n" /* NQAP */ 415 " brc 2,0b" 416 : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) 417 : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) 418 : "cc" ); 419 return reg1; 420 } 421 422 int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) 423 { 424 struct ap_queue_status status; 425 426 status = __ap_send(qid, psmid, msg, length, 0); 427 switch (status.response_code) { 428 case AP_RESPONSE_NORMAL: 429 return 0; 430 case AP_RESPONSE_Q_FULL: 431 case AP_RESPONSE_RESET_IN_PROGRESS: 432 return -EBUSY; 433 case AP_RESPONSE_REQ_FAC_NOT_INST: 434 return -EINVAL; 435 default: /* Device is gone. */ 436 return -ENODEV; 437 } 438 } 439 EXPORT_SYMBOL(ap_send); 440 441 /** 442 * __ap_recv(): Receive message from adjunct processor queue. 443 * @qid: The AP queue number 444 * @psmid: Pointer to program supplied message identifier 445 * @msg: The message text 446 * @length: The message length 447 * 448 * Returns AP queue status structure. 449 * Condition code 1 on DQAP means the receive has taken place 450 * but only partially. The response is incomplete, hence the 451 * DQAP is repeated. 452 * Condition code 2 on DQAP also means the receive is incomplete, 453 * this time because a segment boundary was reached. Again, the 454 * DQAP is repeated. 455 * Note that gpr2 is used by the DQAP instruction to keep track of 456 * any 'residual' length, in case the instruction gets interrupted. 457 * Hence it gets zeroed before the instruction. 458 */ 459 static inline struct ap_queue_status 460 __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) 461 { 462 typedef struct { char _[length]; } msgblock; 463 register unsigned long reg0 asm("0") = qid | 0x80000000UL; 464 register struct ap_queue_status reg1 asm ("1"); 465 register unsigned long reg2 asm("2") = 0UL; 466 register unsigned long reg4 asm("4") = (unsigned long) msg; 467 register unsigned long reg5 asm("5") = (unsigned long) length; 468 register unsigned long reg6 asm("6") = 0UL; 469 register unsigned long reg7 asm("7") = 0UL; 470 471 472 asm volatile( 473 "0: .long 0xb2ae0064\n" /* DQAP */ 474 " brc 6,0b\n" 475 : "+d" (reg0), "=d" (reg1), "+d" (reg2), 476 "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), 477 "=m" (*(msgblock *) msg) : : "cc" ); 478 *psmid = (((unsigned long long) reg6) << 32) + reg7; 479 return reg1; 480 } 481 482 int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) 483 { 484 struct ap_queue_status status; 485 486 status = __ap_recv(qid, psmid, msg, length); 487 switch (status.response_code) { 488 case AP_RESPONSE_NORMAL: 489 return 0; 490 case AP_RESPONSE_NO_PENDING_REPLY: 491 if (status.queue_empty) 492 return -ENOENT; 493 return -EBUSY; 494 case AP_RESPONSE_RESET_IN_PROGRESS: 495 return -EBUSY; 496 default: 497 return -ENODEV; 498 } 499 } 500 EXPORT_SYMBOL(ap_recv); 501 502 /** 503 * ap_query_queue(): Check if an AP queue is available. 504 * @qid: The AP queue number 505 * @queue_depth: Pointer to queue depth value 506 * @device_type: Pointer to device type value 507 * 508 * The test is repeated for AP_MAX_RESET times. 509 */ 510 static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type) 511 { 512 struct ap_queue_status status; 513 int t_depth, t_device_type, rc, i; 514 515 rc = -EBUSY; 516 for (i = 0; i < AP_MAX_RESET; i++) { 517 status = ap_test_queue(qid, &t_depth, &t_device_type); 518 switch (status.response_code) { 519 case AP_RESPONSE_NORMAL: 520 *queue_depth = t_depth + 1; 521 *device_type = t_device_type; 522 rc = 0; 523 break; 524 case AP_RESPONSE_Q_NOT_AVAIL: 525 rc = -ENODEV; 526 break; 527 case AP_RESPONSE_RESET_IN_PROGRESS: 528 break; 529 case AP_RESPONSE_DECONFIGURED: 530 rc = -ENODEV; 531 break; 532 case AP_RESPONSE_CHECKSTOPPED: 533 rc = -ENODEV; 534 break; 535 case AP_RESPONSE_INVALID_ADDRESS: 536 rc = -ENODEV; 537 break; 538 case AP_RESPONSE_OTHERWISE_CHANGED: 539 break; 540 case AP_RESPONSE_BUSY: 541 break; 542 default: 543 BUG(); 544 } 545 if (rc != -EBUSY) 546 break; 547 if (i < AP_MAX_RESET - 1) 548 udelay(5); 549 } 550 return rc; 551 } 552 553 /** 554 * ap_init_queue(): Reset an AP queue. 555 * @qid: The AP queue number 556 * 557 * Reset an AP queue and wait for it to become available again. 558 */ 559 static int ap_init_queue(ap_qid_t qid) 560 { 561 struct ap_queue_status status; 562 int rc, dummy, i; 563 564 rc = -ENODEV; 565 status = ap_reset_queue(qid); 566 for (i = 0; i < AP_MAX_RESET; i++) { 567 switch (status.response_code) { 568 case AP_RESPONSE_NORMAL: 569 if (status.queue_empty) 570 rc = 0; 571 break; 572 case AP_RESPONSE_Q_NOT_AVAIL: 573 case AP_RESPONSE_DECONFIGURED: 574 case AP_RESPONSE_CHECKSTOPPED: 575 i = AP_MAX_RESET; /* return with -ENODEV */ 576 break; 577 case AP_RESPONSE_RESET_IN_PROGRESS: 578 rc = -EBUSY; 579 case AP_RESPONSE_BUSY: 580 default: 581 break; 582 } 583 if (rc != -ENODEV && rc != -EBUSY) 584 break; 585 if (i < AP_MAX_RESET - 1) { 586 udelay(5); 587 status = ap_test_queue(qid, &dummy, &dummy); 588 } 589 } 590 if (rc == 0 && ap_using_interrupts()) { 591 rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator); 592 /* If interruption mode is supported by the machine, 593 * but an AP can not be enabled for interruption then 594 * the AP will be discarded. */ 595 if (rc) 596 pr_err("Registering adapter interrupts for " 597 "AP %d failed\n", AP_QID_DEVICE(qid)); 598 } 599 return rc; 600 } 601 602 /** 603 * ap_increase_queue_count(): Arm request timeout. 604 * @ap_dev: Pointer to an AP device. 605 * 606 * Arm request timeout if an AP device was idle and a new request is submitted. 607 */ 608 static void ap_increase_queue_count(struct ap_device *ap_dev) 609 { 610 int timeout = ap_dev->drv->request_timeout; 611 612 ap_dev->queue_count++; 613 if (ap_dev->queue_count == 1) { 614 mod_timer(&ap_dev->timeout, jiffies + timeout); 615 ap_dev->reset = AP_RESET_ARMED; 616 } 617 } 618 619 /** 620 * ap_decrease_queue_count(): Decrease queue count. 621 * @ap_dev: Pointer to an AP device. 622 * 623 * If AP device is still alive, re-schedule request timeout if there are still 624 * pending requests. 625 */ 626 static void ap_decrease_queue_count(struct ap_device *ap_dev) 627 { 628 int timeout = ap_dev->drv->request_timeout; 629 630 ap_dev->queue_count--; 631 if (ap_dev->queue_count > 0) 632 mod_timer(&ap_dev->timeout, jiffies + timeout); 633 else 634 /* 635 * The timeout timer should to be disabled now - since 636 * del_timer_sync() is very expensive, we just tell via the 637 * reset flag to ignore the pending timeout timer. 638 */ 639 ap_dev->reset = AP_RESET_IGNORE; 640 } 641 642 /* 643 * AP device related attributes. 644 */ 645 static ssize_t ap_hwtype_show(struct device *dev, 646 struct device_attribute *attr, char *buf) 647 { 648 struct ap_device *ap_dev = to_ap_dev(dev); 649 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); 650 } 651 652 static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); 653 static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, 654 char *buf) 655 { 656 struct ap_device *ap_dev = to_ap_dev(dev); 657 return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); 658 } 659 660 static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); 661 static ssize_t ap_request_count_show(struct device *dev, 662 struct device_attribute *attr, 663 char *buf) 664 { 665 struct ap_device *ap_dev = to_ap_dev(dev); 666 int rc; 667 668 spin_lock_bh(&ap_dev->lock); 669 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); 670 spin_unlock_bh(&ap_dev->lock); 671 return rc; 672 } 673 674 static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); 675 676 static ssize_t ap_requestq_count_show(struct device *dev, 677 struct device_attribute *attr, char *buf) 678 { 679 struct ap_device *ap_dev = to_ap_dev(dev); 680 int rc; 681 682 spin_lock_bh(&ap_dev->lock); 683 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->requestq_count); 684 spin_unlock_bh(&ap_dev->lock); 685 return rc; 686 } 687 688 static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL); 689 690 static ssize_t ap_pendingq_count_show(struct device *dev, 691 struct device_attribute *attr, char *buf) 692 { 693 struct ap_device *ap_dev = to_ap_dev(dev); 694 int rc; 695 696 spin_lock_bh(&ap_dev->lock); 697 rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->pendingq_count); 698 spin_unlock_bh(&ap_dev->lock); 699 return rc; 700 } 701 702 static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL); 703 704 static ssize_t ap_modalias_show(struct device *dev, 705 struct device_attribute *attr, char *buf) 706 { 707 return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type); 708 } 709 710 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); 711 712 static ssize_t ap_functions_show(struct device *dev, 713 struct device_attribute *attr, char *buf) 714 { 715 struct ap_device *ap_dev = to_ap_dev(dev); 716 return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions); 717 } 718 719 static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL); 720 721 static struct attribute *ap_dev_attrs[] = { 722 &dev_attr_hwtype.attr, 723 &dev_attr_depth.attr, 724 &dev_attr_request_count.attr, 725 &dev_attr_requestq_count.attr, 726 &dev_attr_pendingq_count.attr, 727 &dev_attr_modalias.attr, 728 &dev_attr_ap_functions.attr, 729 NULL 730 }; 731 static struct attribute_group ap_dev_attr_group = { 732 .attrs = ap_dev_attrs 733 }; 734 735 /** 736 * ap_bus_match() 737 * @dev: Pointer to device 738 * @drv: Pointer to device_driver 739 * 740 * AP bus driver registration/unregistration. 741 */ 742 static int ap_bus_match(struct device *dev, struct device_driver *drv) 743 { 744 struct ap_device *ap_dev = to_ap_dev(dev); 745 struct ap_driver *ap_drv = to_ap_drv(drv); 746 struct ap_device_id *id; 747 748 /* 749 * Compare device type of the device with the list of 750 * supported types of the device_driver. 751 */ 752 for (id = ap_drv->ids; id->match_flags; id++) { 753 if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && 754 (id->dev_type != ap_dev->device_type)) 755 continue; 756 return 1; 757 } 758 return 0; 759 } 760 761 /** 762 * ap_uevent(): Uevent function for AP devices. 763 * @dev: Pointer to device 764 * @env: Pointer to kobj_uevent_env 765 * 766 * It sets up a single environment variable DEV_TYPE which contains the 767 * hardware device type. 768 */ 769 static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) 770 { 771 struct ap_device *ap_dev = to_ap_dev(dev); 772 int retval = 0; 773 774 if (!ap_dev) 775 return -ENODEV; 776 777 /* Set up DEV_TYPE environment variable. */ 778 retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); 779 if (retval) 780 return retval; 781 782 /* Add MODALIAS= */ 783 retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); 784 785 return retval; 786 } 787 788 static int ap_bus_suspend(struct device *dev, pm_message_t state) 789 { 790 struct ap_device *ap_dev = to_ap_dev(dev); 791 unsigned long flags; 792 793 if (!ap_suspend_flag) { 794 ap_suspend_flag = 1; 795 796 /* Disable scanning for devices, thus we do not want to scan 797 * for them after removing. 798 */ 799 del_timer_sync(&ap_config_timer); 800 if (ap_work_queue != NULL) { 801 destroy_workqueue(ap_work_queue); 802 ap_work_queue = NULL; 803 } 804 805 tasklet_disable(&ap_tasklet); 806 } 807 /* Poll on the device until all requests are finished. */ 808 do { 809 flags = 0; 810 spin_lock_bh(&ap_dev->lock); 811 __ap_poll_device(ap_dev, &flags); 812 spin_unlock_bh(&ap_dev->lock); 813 } while ((flags & 1) || (flags & 2)); 814 815 spin_lock_bh(&ap_dev->lock); 816 ap_dev->unregistered = 1; 817 spin_unlock_bh(&ap_dev->lock); 818 819 return 0; 820 } 821 822 static int ap_bus_resume(struct device *dev) 823 { 824 int rc = 0; 825 struct ap_device *ap_dev = to_ap_dev(dev); 826 827 if (ap_suspend_flag) { 828 ap_suspend_flag = 0; 829 if (!ap_interrupts_available()) 830 ap_interrupt_indicator = NULL; 831 ap_query_configuration(); 832 if (!user_set_domain) { 833 ap_domain_index = -1; 834 ap_select_domain(); 835 } 836 init_timer(&ap_config_timer); 837 ap_config_timer.function = ap_config_timeout; 838 ap_config_timer.data = 0; 839 ap_config_timer.expires = jiffies + ap_config_time * HZ; 840 add_timer(&ap_config_timer); 841 ap_work_queue = create_singlethread_workqueue("kapwork"); 842 if (!ap_work_queue) 843 return -ENOMEM; 844 tasklet_enable(&ap_tasklet); 845 if (!ap_using_interrupts()) 846 ap_schedule_poll_timer(); 847 else 848 tasklet_schedule(&ap_tasklet); 849 if (ap_thread_flag) 850 rc = ap_poll_thread_start(); 851 } 852 if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) { 853 spin_lock_bh(&ap_dev->lock); 854 ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid), 855 ap_domain_index); 856 spin_unlock_bh(&ap_dev->lock); 857 } 858 queue_work(ap_work_queue, &ap_config_work); 859 860 return rc; 861 } 862 863 static struct bus_type ap_bus_type = { 864 .name = "ap", 865 .match = &ap_bus_match, 866 .uevent = &ap_uevent, 867 .suspend = ap_bus_suspend, 868 .resume = ap_bus_resume 869 }; 870 871 static int ap_device_probe(struct device *dev) 872 { 873 struct ap_device *ap_dev = to_ap_dev(dev); 874 struct ap_driver *ap_drv = to_ap_drv(dev->driver); 875 int rc; 876 877 ap_dev->drv = ap_drv; 878 rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; 879 if (!rc) { 880 spin_lock_bh(&ap_device_list_lock); 881 list_add(&ap_dev->list, &ap_device_list); 882 spin_unlock_bh(&ap_device_list_lock); 883 } 884 return rc; 885 } 886 887 /** 888 * __ap_flush_queue(): Flush requests. 889 * @ap_dev: Pointer to the AP device 890 * 891 * Flush all requests from the request/pending queue of an AP device. 892 */ 893 static void __ap_flush_queue(struct ap_device *ap_dev) 894 { 895 struct ap_message *ap_msg, *next; 896 897 list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { 898 list_del_init(&ap_msg->list); 899 ap_dev->pendingq_count--; 900 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); 901 } 902 list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { 903 list_del_init(&ap_msg->list); 904 ap_dev->requestq_count--; 905 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); 906 } 907 } 908 909 void ap_flush_queue(struct ap_device *ap_dev) 910 { 911 spin_lock_bh(&ap_dev->lock); 912 __ap_flush_queue(ap_dev); 913 spin_unlock_bh(&ap_dev->lock); 914 } 915 EXPORT_SYMBOL(ap_flush_queue); 916 917 static int ap_device_remove(struct device *dev) 918 { 919 struct ap_device *ap_dev = to_ap_dev(dev); 920 struct ap_driver *ap_drv = ap_dev->drv; 921 922 ap_flush_queue(ap_dev); 923 del_timer_sync(&ap_dev->timeout); 924 spin_lock_bh(&ap_device_list_lock); 925 list_del_init(&ap_dev->list); 926 spin_unlock_bh(&ap_device_list_lock); 927 if (ap_drv->remove) 928 ap_drv->remove(ap_dev); 929 spin_lock_bh(&ap_dev->lock); 930 atomic_sub(ap_dev->queue_count, &ap_poll_requests); 931 spin_unlock_bh(&ap_dev->lock); 932 return 0; 933 } 934 935 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, 936 char *name) 937 { 938 struct device_driver *drv = &ap_drv->driver; 939 940 drv->bus = &ap_bus_type; 941 drv->probe = ap_device_probe; 942 drv->remove = ap_device_remove; 943 drv->owner = owner; 944 drv->name = name; 945 return driver_register(drv); 946 } 947 EXPORT_SYMBOL(ap_driver_register); 948 949 void ap_driver_unregister(struct ap_driver *ap_drv) 950 { 951 driver_unregister(&ap_drv->driver); 952 } 953 EXPORT_SYMBOL(ap_driver_unregister); 954 955 void ap_bus_force_rescan(void) 956 { 957 /* reconfigure the AP bus rescan timer. */ 958 mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); 959 /* processing a asynchronous bus rescan */ 960 queue_work(ap_work_queue, &ap_config_work); 961 flush_work(&ap_config_work); 962 } 963 EXPORT_SYMBOL(ap_bus_force_rescan); 964 965 /* 966 * AP bus attributes. 967 */ 968 static ssize_t ap_domain_show(struct bus_type *bus, char *buf) 969 { 970 return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); 971 } 972 973 static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); 974 975 static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) 976 { 977 return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); 978 } 979 980 static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) 981 { 982 return snprintf(buf, PAGE_SIZE, "%d\n", 983 ap_using_interrupts() ? 1 : 0); 984 } 985 986 static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); 987 988 static ssize_t ap_config_time_store(struct bus_type *bus, 989 const char *buf, size_t count) 990 { 991 int time; 992 993 if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) 994 return -EINVAL; 995 ap_config_time = time; 996 if (!timer_pending(&ap_config_timer) || 997 !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) { 998 ap_config_timer.expires = jiffies + ap_config_time * HZ; 999 add_timer(&ap_config_timer); 1000 } 1001 return count; 1002 } 1003 1004 static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); 1005 1006 static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) 1007 { 1008 return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); 1009 } 1010 1011 static ssize_t ap_poll_thread_store(struct bus_type *bus, 1012 const char *buf, size_t count) 1013 { 1014 int flag, rc; 1015 1016 if (sscanf(buf, "%d\n", &flag) != 1) 1017 return -EINVAL; 1018 if (flag) { 1019 rc = ap_poll_thread_start(); 1020 if (rc) 1021 return rc; 1022 } 1023 else 1024 ap_poll_thread_stop(); 1025 return count; 1026 } 1027 1028 static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); 1029 1030 static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) 1031 { 1032 return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); 1033 } 1034 1035 static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, 1036 size_t count) 1037 { 1038 unsigned long long time; 1039 ktime_t hr_time; 1040 1041 /* 120 seconds = maximum poll interval */ 1042 if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || 1043 time > 120000000000ULL) 1044 return -EINVAL; 1045 poll_timeout = time; 1046 hr_time = ktime_set(0, poll_timeout); 1047 1048 if (!hrtimer_is_queued(&ap_poll_timer) || 1049 !hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) { 1050 hrtimer_set_expires(&ap_poll_timer, hr_time); 1051 hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); 1052 } 1053 return count; 1054 } 1055 1056 static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); 1057 1058 static struct bus_attribute *const ap_bus_attrs[] = { 1059 &bus_attr_ap_domain, 1060 &bus_attr_config_time, 1061 &bus_attr_poll_thread, 1062 &bus_attr_ap_interrupts, 1063 &bus_attr_poll_timeout, 1064 NULL, 1065 }; 1066 1067 static inline int ap_test_config(unsigned int *field, unsigned int nr) 1068 { 1069 if (nr > 0xFFu) 1070 return 0; 1071 return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); 1072 } 1073 1074 /* 1075 * ap_test_config_card_id(): Test, whether an AP card ID is configured. 1076 * @id AP card ID 1077 * 1078 * Returns 0 if the card is not configured 1079 * 1 if the card is configured or 1080 * if the configuration information is not available 1081 */ 1082 static inline int ap_test_config_card_id(unsigned int id) 1083 { 1084 if (!ap_configuration) 1085 return 1; 1086 return ap_test_config(ap_configuration->apm, id); 1087 } 1088 1089 /* 1090 * ap_test_config_domain(): Test, whether an AP usage domain is configured. 1091 * @domain AP usage domain ID 1092 * 1093 * Returns 0 if the usage domain is not configured 1094 * 1 if the usage domain is configured or 1095 * if the configuration information is not available 1096 */ 1097 static inline int ap_test_config_domain(unsigned int domain) 1098 { 1099 if (!ap_configuration) 1100 return 1; 1101 return ap_test_config(ap_configuration->aqm, domain); 1102 } 1103 1104 /** 1105 * ap_query_configuration(): Query AP configuration information. 1106 * 1107 * Query information of installed cards and configured domains from AP. 1108 */ 1109 static void ap_query_configuration(void) 1110 { 1111 #ifdef CONFIG_64BIT 1112 if (ap_configuration_available()) { 1113 if (!ap_configuration) 1114 ap_configuration = 1115 kzalloc(sizeof(struct ap_config_info), 1116 GFP_KERNEL); 1117 if (ap_configuration) 1118 __ap_query_configuration(ap_configuration); 1119 } else 1120 ap_configuration = NULL; 1121 #else 1122 ap_configuration = NULL; 1123 #endif 1124 } 1125 1126 /** 1127 * ap_select_domain(): Select an AP domain. 1128 * 1129 * Pick one of the 16 AP domains. 1130 */ 1131 static int ap_select_domain(void) 1132 { 1133 int queue_depth, device_type, count, max_count, best_domain; 1134 ap_qid_t qid; 1135 int rc, i, j; 1136 1137 /* 1138 * We want to use a single domain. Either the one specified with 1139 * the "domain=" parameter or the domain with the maximum number 1140 * of devices. 1141 */ 1142 if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) 1143 /* Domain has already been selected. */ 1144 return 0; 1145 best_domain = -1; 1146 max_count = 0; 1147 for (i = 0; i < AP_DOMAINS; i++) { 1148 if (!ap_test_config_domain(i)) 1149 continue; 1150 count = 0; 1151 for (j = 0; j < AP_DEVICES; j++) { 1152 if (!ap_test_config_card_id(j)) 1153 continue; 1154 qid = AP_MKQID(j, i); 1155 rc = ap_query_queue(qid, &queue_depth, &device_type); 1156 if (rc) 1157 continue; 1158 count++; 1159 } 1160 if (count > max_count) { 1161 max_count = count; 1162 best_domain = i; 1163 } 1164 } 1165 if (best_domain >= 0){ 1166 ap_domain_index = best_domain; 1167 return 0; 1168 } 1169 return -ENODEV; 1170 } 1171 1172 /** 1173 * ap_probe_device_type(): Find the device type of an AP. 1174 * @ap_dev: pointer to the AP device. 1175 * 1176 * Find the device type if query queue returned a device type of 0. 1177 */ 1178 static int ap_probe_device_type(struct ap_device *ap_dev) 1179 { 1180 static unsigned char msg[] = { 1181 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00, 1182 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1183 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00, 1184 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1185 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50, 1186 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01, 1187 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00, 1188 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00, 1189 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1190 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00, 1191 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1192 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00, 1193 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00, 1194 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1195 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00, 1196 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1197 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1198 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1199 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1200 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1201 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1202 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00, 1203 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 1204 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00, 1205 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20, 1206 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53, 1207 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22, 1208 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, 1209 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88, 1210 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66, 1211 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44, 1212 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22, 1213 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00, 1214 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77, 1215 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00, 1216 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00, 1217 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01, 1218 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c, 1219 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68, 1220 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66, 1221 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0, 1222 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8, 1223 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04, 1224 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57, 1225 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d, 1226 }; 1227 struct ap_queue_status status; 1228 unsigned long long psmid; 1229 char *reply; 1230 int rc, i; 1231 1232 reply = (void *) get_zeroed_page(GFP_KERNEL); 1233 if (!reply) { 1234 rc = -ENOMEM; 1235 goto out; 1236 } 1237 1238 status = __ap_send(ap_dev->qid, 0x0102030405060708ULL, 1239 msg, sizeof(msg), 0); 1240 if (status.response_code != AP_RESPONSE_NORMAL) { 1241 rc = -ENODEV; 1242 goto out_free; 1243 } 1244 1245 /* Wait for the test message to complete. */ 1246 for (i = 0; i < 6; i++) { 1247 mdelay(300); 1248 status = __ap_recv(ap_dev->qid, &psmid, reply, 4096); 1249 if (status.response_code == AP_RESPONSE_NORMAL && 1250 psmid == 0x0102030405060708ULL) 1251 break; 1252 } 1253 if (i < 6) { 1254 /* Got an answer. */ 1255 if (reply[0] == 0x00 && reply[1] == 0x86) 1256 ap_dev->device_type = AP_DEVICE_TYPE_PCICC; 1257 else 1258 ap_dev->device_type = AP_DEVICE_TYPE_PCICA; 1259 rc = 0; 1260 } else 1261 rc = -ENODEV; 1262 1263 out_free: 1264 free_page((unsigned long) reply); 1265 out: 1266 return rc; 1267 } 1268 1269 static void ap_interrupt_handler(void *unused1, void *unused2) 1270 { 1271 inc_irq_stat(IRQIO_APB); 1272 tasklet_schedule(&ap_tasklet); 1273 } 1274 1275 /** 1276 * __ap_scan_bus(): Scan the AP bus. 1277 * @dev: Pointer to device 1278 * @data: Pointer to data 1279 * 1280 * Scan the AP bus for new devices. 1281 */ 1282 static int __ap_scan_bus(struct device *dev, void *data) 1283 { 1284 return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; 1285 } 1286 1287 static void ap_device_release(struct device *dev) 1288 { 1289 struct ap_device *ap_dev = to_ap_dev(dev); 1290 1291 kfree(ap_dev); 1292 } 1293 1294 static void ap_scan_bus(struct work_struct *unused) 1295 { 1296 struct ap_device *ap_dev; 1297 struct device *dev; 1298 ap_qid_t qid; 1299 int queue_depth, device_type; 1300 unsigned int device_functions; 1301 int rc, i; 1302 1303 ap_query_configuration(); 1304 if (ap_select_domain() != 0) { 1305 return; 1306 } 1307 for (i = 0; i < AP_DEVICES; i++) { 1308 qid = AP_MKQID(i, ap_domain_index); 1309 dev = bus_find_device(&ap_bus_type, NULL, 1310 (void *)(unsigned long)qid, 1311 __ap_scan_bus); 1312 if (ap_test_config_card_id(i)) 1313 rc = ap_query_queue(qid, &queue_depth, &device_type); 1314 else 1315 rc = -ENODEV; 1316 if (dev) { 1317 if (rc == -EBUSY) { 1318 set_current_state(TASK_UNINTERRUPTIBLE); 1319 schedule_timeout(AP_RESET_TIMEOUT); 1320 rc = ap_query_queue(qid, &queue_depth, 1321 &device_type); 1322 } 1323 ap_dev = to_ap_dev(dev); 1324 spin_lock_bh(&ap_dev->lock); 1325 if (rc || ap_dev->unregistered) { 1326 spin_unlock_bh(&ap_dev->lock); 1327 if (ap_dev->unregistered) 1328 i--; 1329 device_unregister(dev); 1330 put_device(dev); 1331 continue; 1332 } 1333 spin_unlock_bh(&ap_dev->lock); 1334 put_device(dev); 1335 continue; 1336 } 1337 if (rc) 1338 continue; 1339 rc = ap_init_queue(qid); 1340 if (rc) 1341 continue; 1342 ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); 1343 if (!ap_dev) 1344 break; 1345 ap_dev->qid = qid; 1346 ap_dev->queue_depth = queue_depth; 1347 ap_dev->unregistered = 1; 1348 spin_lock_init(&ap_dev->lock); 1349 INIT_LIST_HEAD(&ap_dev->pendingq); 1350 INIT_LIST_HEAD(&ap_dev->requestq); 1351 INIT_LIST_HEAD(&ap_dev->list); 1352 setup_timer(&ap_dev->timeout, ap_request_timeout, 1353 (unsigned long) ap_dev); 1354 switch (device_type) { 1355 case 0: 1356 /* device type probing for old cards */ 1357 if (ap_probe_device_type(ap_dev)) { 1358 kfree(ap_dev); 1359 continue; 1360 } 1361 break; 1362 default: 1363 ap_dev->device_type = device_type; 1364 } 1365 1366 rc = ap_query_functions(qid, &device_functions); 1367 if (!rc) 1368 ap_dev->functions = device_functions; 1369 else 1370 ap_dev->functions = 0u; 1371 1372 ap_dev->device.bus = &ap_bus_type; 1373 ap_dev->device.parent = ap_root_device; 1374 if (dev_set_name(&ap_dev->device, "card%02x", 1375 AP_QID_DEVICE(ap_dev->qid))) { 1376 kfree(ap_dev); 1377 continue; 1378 } 1379 ap_dev->device.release = ap_device_release; 1380 rc = device_register(&ap_dev->device); 1381 if (rc) { 1382 put_device(&ap_dev->device); 1383 continue; 1384 } 1385 /* Add device attributes. */ 1386 rc = sysfs_create_group(&ap_dev->device.kobj, 1387 &ap_dev_attr_group); 1388 if (!rc) { 1389 spin_lock_bh(&ap_dev->lock); 1390 ap_dev->unregistered = 0; 1391 spin_unlock_bh(&ap_dev->lock); 1392 } 1393 else 1394 device_unregister(&ap_dev->device); 1395 } 1396 } 1397 1398 static void 1399 ap_config_timeout(unsigned long ptr) 1400 { 1401 queue_work(ap_work_queue, &ap_config_work); 1402 ap_config_timer.expires = jiffies + ap_config_time * HZ; 1403 add_timer(&ap_config_timer); 1404 } 1405 1406 /** 1407 * __ap_schedule_poll_timer(): Schedule poll timer. 1408 * 1409 * Set up the timer to run the poll tasklet 1410 */ 1411 static inline void __ap_schedule_poll_timer(void) 1412 { 1413 ktime_t hr_time; 1414 1415 spin_lock_bh(&ap_poll_timer_lock); 1416 if (hrtimer_is_queued(&ap_poll_timer) || ap_suspend_flag) 1417 goto out; 1418 if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) { 1419 hr_time = ktime_set(0, poll_timeout); 1420 hrtimer_forward_now(&ap_poll_timer, hr_time); 1421 hrtimer_restart(&ap_poll_timer); 1422 } 1423 out: 1424 spin_unlock_bh(&ap_poll_timer_lock); 1425 } 1426 1427 /** 1428 * ap_schedule_poll_timer(): Schedule poll timer. 1429 * 1430 * Set up the timer to run the poll tasklet 1431 */ 1432 static inline void ap_schedule_poll_timer(void) 1433 { 1434 if (ap_using_interrupts()) 1435 return; 1436 __ap_schedule_poll_timer(); 1437 } 1438 1439 /** 1440 * ap_poll_read(): Receive pending reply messages from an AP device. 1441 * @ap_dev: pointer to the AP device 1442 * @flags: pointer to control flags, bit 2^0 is set if another poll is 1443 * required, bit 2^1 is set if the poll timer needs to get armed 1444 * 1445 * Returns 0 if the device is still present, -ENODEV if not. 1446 */ 1447 static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags) 1448 { 1449 struct ap_queue_status status; 1450 struct ap_message *ap_msg; 1451 1452 if (ap_dev->queue_count <= 0) 1453 return 0; 1454 status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, 1455 ap_dev->reply->message, ap_dev->reply->length); 1456 switch (status.response_code) { 1457 case AP_RESPONSE_NORMAL: 1458 atomic_dec(&ap_poll_requests); 1459 ap_decrease_queue_count(ap_dev); 1460 list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { 1461 if (ap_msg->psmid != ap_dev->reply->psmid) 1462 continue; 1463 list_del_init(&ap_msg->list); 1464 ap_dev->pendingq_count--; 1465 ap_msg->receive(ap_dev, ap_msg, ap_dev->reply); 1466 break; 1467 } 1468 if (ap_dev->queue_count > 0) 1469 *flags |= 1; 1470 break; 1471 case AP_RESPONSE_NO_PENDING_REPLY: 1472 if (status.queue_empty) { 1473 /* The card shouldn't forget requests but who knows. */ 1474 atomic_sub(ap_dev->queue_count, &ap_poll_requests); 1475 ap_dev->queue_count = 0; 1476 list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); 1477 ap_dev->requestq_count += ap_dev->pendingq_count; 1478 ap_dev->pendingq_count = 0; 1479 } else 1480 *flags |= 2; 1481 break; 1482 default: 1483 return -ENODEV; 1484 } 1485 return 0; 1486 } 1487 1488 /** 1489 * ap_poll_write(): Send messages from the request queue to an AP device. 1490 * @ap_dev: pointer to the AP device 1491 * @flags: pointer to control flags, bit 2^0 is set if another poll is 1492 * required, bit 2^1 is set if the poll timer needs to get armed 1493 * 1494 * Returns 0 if the device is still present, -ENODEV if not. 1495 */ 1496 static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags) 1497 { 1498 struct ap_queue_status status; 1499 struct ap_message *ap_msg; 1500 1501 if (ap_dev->requestq_count <= 0 || 1502 ap_dev->queue_count >= ap_dev->queue_depth) 1503 return 0; 1504 /* Start the next request on the queue. */ 1505 ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); 1506 status = __ap_send(ap_dev->qid, ap_msg->psmid, 1507 ap_msg->message, ap_msg->length, ap_msg->special); 1508 switch (status.response_code) { 1509 case AP_RESPONSE_NORMAL: 1510 atomic_inc(&ap_poll_requests); 1511 ap_increase_queue_count(ap_dev); 1512 list_move_tail(&ap_msg->list, &ap_dev->pendingq); 1513 ap_dev->requestq_count--; 1514 ap_dev->pendingq_count++; 1515 if (ap_dev->queue_count < ap_dev->queue_depth && 1516 ap_dev->requestq_count > 0) 1517 *flags |= 1; 1518 *flags |= 2; 1519 break; 1520 case AP_RESPONSE_RESET_IN_PROGRESS: 1521 __ap_schedule_poll_timer(); 1522 case AP_RESPONSE_Q_FULL: 1523 *flags |= 2; 1524 break; 1525 case AP_RESPONSE_MESSAGE_TOO_BIG: 1526 case AP_RESPONSE_REQ_FAC_NOT_INST: 1527 return -EINVAL; 1528 default: 1529 return -ENODEV; 1530 } 1531 return 0; 1532 } 1533 1534 /** 1535 * ap_poll_queue(): Poll AP device for pending replies and send new messages. 1536 * @ap_dev: pointer to the bus device 1537 * @flags: pointer to control flags, bit 2^0 is set if another poll is 1538 * required, bit 2^1 is set if the poll timer needs to get armed 1539 * 1540 * Poll AP device for pending replies and send new messages. If either 1541 * ap_poll_read or ap_poll_write returns -ENODEV unregister the device. 1542 * Returns 0. 1543 */ 1544 static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags) 1545 { 1546 int rc; 1547 1548 rc = ap_poll_read(ap_dev, flags); 1549 if (rc) 1550 return rc; 1551 return ap_poll_write(ap_dev, flags); 1552 } 1553 1554 /** 1555 * __ap_queue_message(): Queue a message to a device. 1556 * @ap_dev: pointer to the AP device 1557 * @ap_msg: the message to be queued 1558 * 1559 * Queue a message to a device. Returns 0 if successful. 1560 */ 1561 static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) 1562 { 1563 struct ap_queue_status status; 1564 1565 if (list_empty(&ap_dev->requestq) && 1566 ap_dev->queue_count < ap_dev->queue_depth) { 1567 status = __ap_send(ap_dev->qid, ap_msg->psmid, 1568 ap_msg->message, ap_msg->length, 1569 ap_msg->special); 1570 switch (status.response_code) { 1571 case AP_RESPONSE_NORMAL: 1572 list_add_tail(&ap_msg->list, &ap_dev->pendingq); 1573 atomic_inc(&ap_poll_requests); 1574 ap_dev->pendingq_count++; 1575 ap_increase_queue_count(ap_dev); 1576 ap_dev->total_request_count++; 1577 break; 1578 case AP_RESPONSE_Q_FULL: 1579 case AP_RESPONSE_RESET_IN_PROGRESS: 1580 list_add_tail(&ap_msg->list, &ap_dev->requestq); 1581 ap_dev->requestq_count++; 1582 ap_dev->total_request_count++; 1583 return -EBUSY; 1584 case AP_RESPONSE_REQ_FAC_NOT_INST: 1585 case AP_RESPONSE_MESSAGE_TOO_BIG: 1586 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL)); 1587 return -EINVAL; 1588 default: /* Device is gone. */ 1589 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); 1590 return -ENODEV; 1591 } 1592 } else { 1593 list_add_tail(&ap_msg->list, &ap_dev->requestq); 1594 ap_dev->requestq_count++; 1595 ap_dev->total_request_count++; 1596 return -EBUSY; 1597 } 1598 ap_schedule_poll_timer(); 1599 return 0; 1600 } 1601 1602 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) 1603 { 1604 unsigned long flags; 1605 int rc; 1606 1607 /* For asynchronous message handling a valid receive-callback 1608 * is required. */ 1609 BUG_ON(!ap_msg->receive); 1610 1611 spin_lock_bh(&ap_dev->lock); 1612 if (!ap_dev->unregistered) { 1613 /* Make room on the queue by polling for finished requests. */ 1614 rc = ap_poll_queue(ap_dev, &flags); 1615 if (!rc) 1616 rc = __ap_queue_message(ap_dev, ap_msg); 1617 if (!rc) 1618 wake_up(&ap_poll_wait); 1619 if (rc == -ENODEV) 1620 ap_dev->unregistered = 1; 1621 } else { 1622 ap_msg->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV)); 1623 rc = -ENODEV; 1624 } 1625 spin_unlock_bh(&ap_dev->lock); 1626 if (rc == -ENODEV) 1627 device_unregister(&ap_dev->device); 1628 } 1629 EXPORT_SYMBOL(ap_queue_message); 1630 1631 /** 1632 * ap_cancel_message(): Cancel a crypto request. 1633 * @ap_dev: The AP device that has the message queued 1634 * @ap_msg: The message that is to be removed 1635 * 1636 * Cancel a crypto request. This is done by removing the request 1637 * from the device pending or request queue. Note that the 1638 * request stays on the AP queue. When it finishes the message 1639 * reply will be discarded because the psmid can't be found. 1640 */ 1641 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) 1642 { 1643 struct ap_message *tmp; 1644 1645 spin_lock_bh(&ap_dev->lock); 1646 if (!list_empty(&ap_msg->list)) { 1647 list_for_each_entry(tmp, &ap_dev->pendingq, list) 1648 if (tmp->psmid == ap_msg->psmid) { 1649 ap_dev->pendingq_count--; 1650 goto found; 1651 } 1652 ap_dev->requestq_count--; 1653 found: 1654 list_del_init(&ap_msg->list); 1655 } 1656 spin_unlock_bh(&ap_dev->lock); 1657 } 1658 EXPORT_SYMBOL(ap_cancel_message); 1659 1660 /** 1661 * ap_poll_timeout(): AP receive polling for finished AP requests. 1662 * @unused: Unused pointer. 1663 * 1664 * Schedules the AP tasklet using a high resolution timer. 1665 */ 1666 static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) 1667 { 1668 tasklet_schedule(&ap_tasklet); 1669 return HRTIMER_NORESTART; 1670 } 1671 1672 /** 1673 * ap_reset(): Reset a not responding AP device. 1674 * @ap_dev: Pointer to the AP device 1675 * 1676 * Reset a not responding AP device and move all requests from the 1677 * pending queue to the request queue. 1678 */ 1679 static void ap_reset(struct ap_device *ap_dev) 1680 { 1681 int rc; 1682 1683 ap_dev->reset = AP_RESET_IGNORE; 1684 atomic_sub(ap_dev->queue_count, &ap_poll_requests); 1685 ap_dev->queue_count = 0; 1686 list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); 1687 ap_dev->requestq_count += ap_dev->pendingq_count; 1688 ap_dev->pendingq_count = 0; 1689 rc = ap_init_queue(ap_dev->qid); 1690 if (rc == -ENODEV) 1691 ap_dev->unregistered = 1; 1692 else 1693 __ap_schedule_poll_timer(); 1694 } 1695 1696 static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags) 1697 { 1698 if (!ap_dev->unregistered) { 1699 if (ap_poll_queue(ap_dev, flags)) 1700 ap_dev->unregistered = 1; 1701 if (ap_dev->reset == AP_RESET_DO) 1702 ap_reset(ap_dev); 1703 } 1704 return 0; 1705 } 1706 1707 /** 1708 * ap_poll_all(): Poll all AP devices. 1709 * @dummy: Unused variable 1710 * 1711 * Poll all AP devices on the bus in a round robin fashion. Continue 1712 * polling until bit 2^0 of the control flags is not set. If bit 2^1 1713 * of the control flags has been set arm the poll timer. 1714 */ 1715 static void ap_poll_all(unsigned long dummy) 1716 { 1717 unsigned long flags; 1718 struct ap_device *ap_dev; 1719 1720 /* Reset the indicator if interrupts are used. Thus new interrupts can 1721 * be received. Doing it in the beginning of the tasklet is therefor 1722 * important that no requests on any AP get lost. 1723 */ 1724 if (ap_using_interrupts()) 1725 xchg((u8 *)ap_interrupt_indicator, 0); 1726 do { 1727 flags = 0; 1728 spin_lock(&ap_device_list_lock); 1729 list_for_each_entry(ap_dev, &ap_device_list, list) { 1730 spin_lock(&ap_dev->lock); 1731 __ap_poll_device(ap_dev, &flags); 1732 spin_unlock(&ap_dev->lock); 1733 } 1734 spin_unlock(&ap_device_list_lock); 1735 } while (flags & 1); 1736 if (flags & 2) 1737 ap_schedule_poll_timer(); 1738 } 1739 1740 /** 1741 * ap_poll_thread(): Thread that polls for finished requests. 1742 * @data: Unused pointer 1743 * 1744 * AP bus poll thread. The purpose of this thread is to poll for 1745 * finished requests in a loop if there is a "free" cpu - that is 1746 * a cpu that doesn't have anything better to do. The polling stops 1747 * as soon as there is another task or if all messages have been 1748 * delivered. 1749 */ 1750 static int ap_poll_thread(void *data) 1751 { 1752 DECLARE_WAITQUEUE(wait, current); 1753 unsigned long flags; 1754 int requests; 1755 struct ap_device *ap_dev; 1756 1757 set_user_nice(current, 19); 1758 while (1) { 1759 if (ap_suspend_flag) 1760 return 0; 1761 if (need_resched()) { 1762 schedule(); 1763 continue; 1764 } 1765 add_wait_queue(&ap_poll_wait, &wait); 1766 set_current_state(TASK_INTERRUPTIBLE); 1767 if (kthread_should_stop()) 1768 break; 1769 requests = atomic_read(&ap_poll_requests); 1770 if (requests <= 0) 1771 schedule(); 1772 set_current_state(TASK_RUNNING); 1773 remove_wait_queue(&ap_poll_wait, &wait); 1774 1775 flags = 0; 1776 spin_lock_bh(&ap_device_list_lock); 1777 list_for_each_entry(ap_dev, &ap_device_list, list) { 1778 spin_lock(&ap_dev->lock); 1779 __ap_poll_device(ap_dev, &flags); 1780 spin_unlock(&ap_dev->lock); 1781 } 1782 spin_unlock_bh(&ap_device_list_lock); 1783 } 1784 set_current_state(TASK_RUNNING); 1785 remove_wait_queue(&ap_poll_wait, &wait); 1786 return 0; 1787 } 1788 1789 static int ap_poll_thread_start(void) 1790 { 1791 int rc; 1792 1793 if (ap_using_interrupts() || ap_suspend_flag) 1794 return 0; 1795 mutex_lock(&ap_poll_thread_mutex); 1796 if (!ap_poll_kthread) { 1797 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); 1798 rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0; 1799 if (rc) 1800 ap_poll_kthread = NULL; 1801 } 1802 else 1803 rc = 0; 1804 mutex_unlock(&ap_poll_thread_mutex); 1805 return rc; 1806 } 1807 1808 static void ap_poll_thread_stop(void) 1809 { 1810 mutex_lock(&ap_poll_thread_mutex); 1811 if (ap_poll_kthread) { 1812 kthread_stop(ap_poll_kthread); 1813 ap_poll_kthread = NULL; 1814 } 1815 mutex_unlock(&ap_poll_thread_mutex); 1816 } 1817 1818 /** 1819 * ap_request_timeout(): Handling of request timeouts 1820 * @data: Holds the AP device. 1821 * 1822 * Handles request timeouts. 1823 */ 1824 static void ap_request_timeout(unsigned long data) 1825 { 1826 struct ap_device *ap_dev = (struct ap_device *) data; 1827 1828 if (ap_dev->reset == AP_RESET_ARMED) { 1829 ap_dev->reset = AP_RESET_DO; 1830 1831 if (ap_using_interrupts()) 1832 tasklet_schedule(&ap_tasklet); 1833 } 1834 } 1835 1836 static void ap_reset_domain(void) 1837 { 1838 int i; 1839 1840 if (ap_domain_index != -1) 1841 for (i = 0; i < AP_DEVICES; i++) 1842 ap_reset_queue(AP_MKQID(i, ap_domain_index)); 1843 } 1844 1845 static void ap_reset_all(void) 1846 { 1847 int i, j; 1848 1849 for (i = 0; i < AP_DOMAINS; i++) 1850 for (j = 0; j < AP_DEVICES; j++) 1851 ap_reset_queue(AP_MKQID(j, i)); 1852 } 1853 1854 static struct reset_call ap_reset_call = { 1855 .fn = ap_reset_all, 1856 }; 1857 1858 /** 1859 * ap_module_init(): The module initialization code. 1860 * 1861 * Initializes the module. 1862 */ 1863 int __init ap_module_init(void) 1864 { 1865 int rc, i; 1866 1867 if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) { 1868 pr_warning("%d is not a valid cryptographic domain\n", 1869 ap_domain_index); 1870 return -EINVAL; 1871 } 1872 /* In resume callback we need to know if the user had set the domain. 1873 * If so, we can not just reset it. 1874 */ 1875 if (ap_domain_index >= 0) 1876 user_set_domain = 1; 1877 1878 if (ap_instructions_available() != 0) { 1879 pr_warning("The hardware system does not support " 1880 "AP instructions\n"); 1881 return -ENODEV; 1882 } 1883 if (ap_interrupts_available()) { 1884 isc_register(AP_ISC); 1885 ap_interrupt_indicator = s390_register_adapter_interrupt( 1886 &ap_interrupt_handler, NULL, AP_ISC); 1887 if (IS_ERR(ap_interrupt_indicator)) { 1888 ap_interrupt_indicator = NULL; 1889 isc_unregister(AP_ISC); 1890 } 1891 } 1892 1893 register_reset_call(&ap_reset_call); 1894 1895 /* Create /sys/bus/ap. */ 1896 rc = bus_register(&ap_bus_type); 1897 if (rc) 1898 goto out; 1899 for (i = 0; ap_bus_attrs[i]; i++) { 1900 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); 1901 if (rc) 1902 goto out_bus; 1903 } 1904 1905 /* Create /sys/devices/ap. */ 1906 ap_root_device = root_device_register("ap"); 1907 rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0; 1908 if (rc) 1909 goto out_bus; 1910 1911 ap_work_queue = create_singlethread_workqueue("kapwork"); 1912 if (!ap_work_queue) { 1913 rc = -ENOMEM; 1914 goto out_root; 1915 } 1916 1917 ap_query_configuration(); 1918 if (ap_select_domain() == 0) 1919 ap_scan_bus(NULL); 1920 1921 /* Setup the AP bus rescan timer. */ 1922 init_timer(&ap_config_timer); 1923 ap_config_timer.function = ap_config_timeout; 1924 ap_config_timer.data = 0; 1925 ap_config_timer.expires = jiffies + ap_config_time * HZ; 1926 add_timer(&ap_config_timer); 1927 1928 /* Setup the high resultion poll timer. 1929 * If we are running under z/VM adjust polling to z/VM polling rate. 1930 */ 1931 if (MACHINE_IS_VM) 1932 poll_timeout = 1500000; 1933 spin_lock_init(&ap_poll_timer_lock); 1934 hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 1935 ap_poll_timer.function = ap_poll_timeout; 1936 1937 /* Start the low priority AP bus poll thread. */ 1938 if (ap_thread_flag) { 1939 rc = ap_poll_thread_start(); 1940 if (rc) 1941 goto out_work; 1942 } 1943 1944 return 0; 1945 1946 out_work: 1947 del_timer_sync(&ap_config_timer); 1948 hrtimer_cancel(&ap_poll_timer); 1949 destroy_workqueue(ap_work_queue); 1950 out_root: 1951 root_device_unregister(ap_root_device); 1952 out_bus: 1953 while (i--) 1954 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); 1955 bus_unregister(&ap_bus_type); 1956 out: 1957 unregister_reset_call(&ap_reset_call); 1958 if (ap_using_interrupts()) { 1959 s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); 1960 isc_unregister(AP_ISC); 1961 } 1962 return rc; 1963 } 1964 1965 static int __ap_match_all(struct device *dev, void *data) 1966 { 1967 return 1; 1968 } 1969 1970 /** 1971 * ap_modules_exit(): The module termination code 1972 * 1973 * Terminates the module. 1974 */ 1975 void ap_module_exit(void) 1976 { 1977 int i; 1978 struct device *dev; 1979 1980 ap_reset_domain(); 1981 ap_poll_thread_stop(); 1982 del_timer_sync(&ap_config_timer); 1983 hrtimer_cancel(&ap_poll_timer); 1984 destroy_workqueue(ap_work_queue); 1985 tasklet_kill(&ap_tasklet); 1986 root_device_unregister(ap_root_device); 1987 while ((dev = bus_find_device(&ap_bus_type, NULL, NULL, 1988 __ap_match_all))) 1989 { 1990 device_unregister(dev); 1991 put_device(dev); 1992 } 1993 for (i = 0; ap_bus_attrs[i]; i++) 1994 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); 1995 bus_unregister(&ap_bus_type); 1996 unregister_reset_call(&ap_reset_call); 1997 if (ap_using_interrupts()) { 1998 s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC); 1999 isc_unregister(AP_ISC); 2000 } 2001 } 2002 2003 module_init(ap_module_init); 2004 module_exit(ap_module_exit); 2005