drivers/s390/crypto/ap_bus.c

   1 /*
   2  * linux/drivers/s390/crypto/ap_bus.c
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *            Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  *            Ralph Wuerthner <rwuerthn@de.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 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/err.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/workqueue.h>
  32 #include <linux/notifier.h>
  33 #include <linux/kthread.h>
  34 #include <linux/mutex.h>
  35 #include <asm/s390_rdev.h>
  36 #include <asm/reset.h>
  37
  38 #include "ap_bus.h"
  39
  40 /* Some prototypes. */
  41 static void ap_scan_bus(struct work_struct *);
  42 static void ap_poll_all(unsigned long);
  43 static void ap_poll_timeout(unsigned long);
  44 static int ap_poll_thread_start(void);
  45 static void ap_poll_thread_stop(void);
  46
  47 /**
  48  * Module description.
  49  */
  50 MODULE_AUTHOR("IBM Corporation");
  51 MODULE_DESCRIPTION("Adjunct Processor Bus driver, "
  52                    "Copyright 2006 IBM Corporation");
  53 MODULE_LICENSE("GPL");
  54
  55 /**
  56  * Module parameter
  57  */
  58 int ap_domain_index = -1;       /* Adjunct Processor Domain Index */
  59 module_param_named(domain, ap_domain_index, int, 0000);
  60 MODULE_PARM_DESC(domain, "domain index for ap devices");
  61 EXPORT_SYMBOL(ap_domain_index);
  62
  63 static int ap_thread_flag = 1;
  64 module_param_named(poll_thread, ap_thread_flag, int, 0000);
  65 MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 1 (on).");
  66
  67 static struct device *ap_root_device = NULL;
  68
  69 /**
  70  * Workqueue & timer for bus rescan.
  71  */
  72 static struct workqueue_struct *ap_work_queue;
  73 static struct timer_list ap_config_timer;
  74 static int ap_config_time = AP_CONFIG_TIME;
  75 static DECLARE_WORK(ap_config_work, ap_scan_bus);
  76
  77 /**
  78  * Tasklet & timer for AP request polling.
  79  */
  80 static struct timer_list ap_poll_timer = TIMER_INITIALIZER(ap_poll_timeout,0,0);
  81 static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0);
  82 static atomic_t ap_poll_requests = ATOMIC_INIT(0);
  83 static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
  84 static struct task_struct *ap_poll_kthread = NULL;
  85 static DEFINE_MUTEX(ap_poll_thread_mutex);
  86
  87 /**
  88  * Test if ap instructions are available.
  89  *
  90  * Returns 0 if the ap instructions are installed.
  91  */
  92 static inline int ap_instructions_available(void)
  93 {
  94         register unsigned long reg0 asm ("0") = AP_MKQID(0,0);
  95         register unsigned long reg1 asm ("1") = -ENODEV;
  96         register unsigned long reg2 asm ("2") = 0UL;
  97
  98         asm volatile(
  99                 "   .long 0xb2af0000\n"         /* PQAP(TAPQ) */
 100                 "0: la    %1,0\n"
 101                 "1:\n"
 102                 EX_TABLE(0b, 1b)
 103                 : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" );
 104         return reg1;
 105 }
 106
 107 /**
 108  * Test adjunct processor queue.
 109  * @qid: the ap queue number
 110  * @queue_depth: pointer to queue depth value
 111  * @device_type: pointer to device type value
 112  *
 113  * Returns ap queue status structure.
 114  */
 115 static inline struct ap_queue_status
 116 ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
 117 {
 118         register unsigned long reg0 asm ("0") = qid;
 119         register struct ap_queue_status reg1 asm ("1");
 120         register unsigned long reg2 asm ("2") = 0UL;
 121
 122         asm volatile(".long 0xb2af0000"         /* PQAP(TAPQ) */
 123                      : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
 124         *device_type = (int) (reg2 >> 24);
 125         *queue_depth = (int) (reg2 & 0xff);
 126         return reg1;
 127 }
 128
 129 /**
 130  * Reset adjunct processor queue.
 131  * @qid: the ap queue number
 132  *
 133  * Returns ap queue status structure.
 134  */
 135 static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid)
 136 {
 137         register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
 138         register struct ap_queue_status reg1 asm ("1");
 139         register unsigned long reg2 asm ("2") = 0UL;
 140
 141         asm volatile(
 142                 ".long 0xb2af0000"              /* PQAP(RAPQ) */
 143                 : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
 144         return reg1;
 145 }
 146
 147 /**
 148  * Send message to adjunct processor queue.
 149  * @qid: the ap queue number
 150  * @psmid: the program supplied message identifier
 151  * @msg: the message text
 152  * @length: the message length
 153  *
 154  * Returns ap queue status structure.
 155  *
 156  * Condition code 1 on NQAP can't happen because the L bit is 1.
 157  *
 158  * Condition code 2 on NQAP also means the send is incomplete,
 159  * because a segment boundary was reached. The NQAP is repeated.
 160  */
 161 static inline struct ap_queue_status
 162 __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
 163 {
 164         typedef struct { char _[length]; } msgblock;
 165         register unsigned long reg0 asm ("0") = qid | 0x40000000UL;
 166         register struct ap_queue_status reg1 asm ("1");
 167         register unsigned long reg2 asm ("2") = (unsigned long) msg;
 168         register unsigned long reg3 asm ("3") = (unsigned long) length;
 169         register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32);
 170         register unsigned long reg5 asm ("5") = (unsigned int) psmid;
 171
 172         asm volatile (
 173                 "0: .long 0xb2ad0042\n"         /* DQAP */
 174                 "   brc   2,0b"
 175                 : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3)
 176                 : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg)
 177                 : "cc" );
 178         return reg1;
 179 }
 180
 181 int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
 182 {
 183         struct ap_queue_status status;
 184
 185         status = __ap_send(qid, psmid, msg, length);
 186         switch (status.response_code) {
 187         case AP_RESPONSE_NORMAL:
 188                 return 0;
 189         case AP_RESPONSE_Q_FULL:
 190                 return -EBUSY;
 191         default:        /* Device is gone. */
 192                 return -ENODEV;
 193         }
 194 }
 195 EXPORT_SYMBOL(ap_send);
 196
 197 /*
 198  * Receive message from adjunct processor queue.
 199  * @qid: the ap queue number
 200  * @psmid: pointer to program supplied message identifier
 201  * @msg: the message text
 202  * @length: the message length
 203  *
 204  * Returns ap queue status structure.
 205  *
 206  * Condition code 1 on DQAP means the receive has taken place
 207  * but only partially.  The response is incomplete, hence the
 208  * DQAP is repeated.
 209  *
 210  * Condition code 2 on DQAP also means the receive is incomplete,
 211  * this time because a segment boundary was reached. Again, the
 212  * DQAP is repeated.
 213  *
 214  * Note that gpr2 is used by the DQAP instruction to keep track of
 215  * any 'residual' length, in case the instruction gets interrupted.
 216  * Hence it gets zeroed before the instruction.
 217  */
 218 static inline struct ap_queue_status
 219 __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
 220 {
 221         typedef struct { char _[length]; } msgblock;
 222         register unsigned long reg0 asm("0") = qid | 0x80000000UL;
 223         register struct ap_queue_status reg1 asm ("1");
 224         register unsigned long reg2 asm("2") = 0UL;
 225         register unsigned long reg4 asm("4") = (unsigned long) msg;
 226         register unsigned long reg5 asm("5") = (unsigned long) length;
 227         register unsigned long reg6 asm("6") = 0UL;
 228         register unsigned long reg7 asm("7") = 0UL;
 229
 230
 231         asm volatile(
 232                 "0: .long 0xb2ae0064\n"
 233                 "   brc   6,0b\n"
 234                 : "+d" (reg0), "=d" (reg1), "+d" (reg2),
 235                 "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7),
 236                 "=m" (*(msgblock *) msg) : : "cc" );
 237         *psmid = (((unsigned long long) reg6) << 32) + reg7;
 238         return reg1;
 239 }
 240
 241 int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
 242 {
 243         struct ap_queue_status status;
 244
 245         status = __ap_recv(qid, psmid, msg, length);
 246         switch (status.response_code) {
 247         case AP_RESPONSE_NORMAL:
 248                 return 0;
 249         case AP_RESPONSE_NO_PENDING_REPLY:
 250                 if (status.queue_empty)
 251                         return -ENOENT;
 252                 return -EBUSY;
 253         default:
 254                 return -ENODEV;
 255         }
 256 }
 257 EXPORT_SYMBOL(ap_recv);
 258
 259 /**
 260  * Check if an AP queue is available. The test is repeated for
 261  * AP_MAX_RESET times.
 262  * @qid: the ap queue number
 263  * @queue_depth: pointer to queue depth value
 264  * @device_type: pointer to device type value
 265  */
 266 static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type)
 267 {
 268         struct ap_queue_status status;
 269         int t_depth, t_device_type, rc, i;
 270
 271         rc = -EBUSY;
 272         for (i = 0; i < AP_MAX_RESET; i++) {
 273                 status = ap_test_queue(qid, &t_depth, &t_device_type);
 274                 switch (status.response_code) {
 275                 case AP_RESPONSE_NORMAL:
 276                         *queue_depth = t_depth + 1;
 277                         *device_type = t_device_type;
 278                         rc = 0;
 279                         break;
 280                 case AP_RESPONSE_Q_NOT_AVAIL:
 281                         rc = -ENODEV;
 282                         break;
 283                 case AP_RESPONSE_RESET_IN_PROGRESS:
 284                         break;
 285                 case AP_RESPONSE_DECONFIGURED:
 286                         rc = -ENODEV;
 287                         break;
 288                 case AP_RESPONSE_CHECKSTOPPED:
 289                         rc = -ENODEV;
 290                         break;
 291                 case AP_RESPONSE_BUSY:
 292                         break;
 293                 default:
 294                         BUG();
 295                 }
 296                 if (rc != -EBUSY)
 297                         break;
 298                 if (i < AP_MAX_RESET - 1)
 299                         udelay(5);
 300         }
 301         return rc;
 302 }
 303
 304 /**
 305  * Reset an AP queue and wait for it to become available again.
 306  * @qid: the ap queue number
 307  */
 308 static int ap_init_queue(ap_qid_t qid)
 309 {
 310         struct ap_queue_status status;
 311         int rc, dummy, i;
 312
 313         rc = -ENODEV;
 314         status = ap_reset_queue(qid);
 315         for (i = 0; i < AP_MAX_RESET; i++) {
 316                 switch (status.response_code) {
 317                 case AP_RESPONSE_NORMAL:
 318                         if (status.queue_empty)
 319                                 rc = 0;
 320                         break;
 321                 case AP_RESPONSE_Q_NOT_AVAIL:
 322                 case AP_RESPONSE_DECONFIGURED:
 323                 case AP_RESPONSE_CHECKSTOPPED:
 324                         i = AP_MAX_RESET;       /* return with -ENODEV */
 325                         break;
 326                 case AP_RESPONSE_RESET_IN_PROGRESS:
 327                 case AP_RESPONSE_BUSY:
 328                 default:
 329                         break;
 330                 }
 331                 if (rc != -ENODEV)
 332                         break;
 333                 if (i < AP_MAX_RESET - 1) {
 334                         udelay(5);
 335                         status = ap_test_queue(qid, &dummy, &dummy);
 336                 }
 337         }
 338         return rc;
 339 }
 340
 341 /**
 342  * AP device related attributes.
 343  */
 344 static ssize_t ap_hwtype_show(struct device *dev,
 345                               struct device_attribute *attr, char *buf)
 346 {
 347         struct ap_device *ap_dev = to_ap_dev(dev);
 348         return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type);
 349 }
 350 static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
 351
 352 static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
 353                              char *buf)
 354 {
 355         struct ap_device *ap_dev = to_ap_dev(dev);
 356         return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth);
 357 }
 358 static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
 359
 360 static ssize_t ap_request_count_show(struct device *dev,
 361                                      struct device_attribute *attr,
 362                                      char *buf)
 363 {
 364         struct ap_device *ap_dev = to_ap_dev(dev);
 365         int rc;
 366
 367         spin_lock_bh(&ap_dev->lock);
 368         rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count);
 369         spin_unlock_bh(&ap_dev->lock);
 370         return rc;
 371 }
 372
 373 static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL);
 374
 375 static ssize_t ap_modalias_show(struct device *dev,
 376                                 struct device_attribute *attr, char *buf)
 377 {
 378         return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type);
 379 }
 380
 381 static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
 382
 383 static struct attribute *ap_dev_attrs[] = {
 384         &dev_attr_hwtype.attr,
 385         &dev_attr_depth.attr,
 386         &dev_attr_request_count.attr,
 387         &dev_attr_modalias.attr,
 388         NULL
 389 };
 390 static struct attribute_group ap_dev_attr_group = {
 391         .attrs = ap_dev_attrs
 392 };
 393
 394 /**
 395  * AP bus driver registration/unregistration.
 396  */
 397 static int ap_bus_match(struct device *dev, struct device_driver *drv)
 398 {
 399         struct ap_device *ap_dev = to_ap_dev(dev);
 400         struct ap_driver *ap_drv = to_ap_drv(drv);
 401         struct ap_device_id *id;
 402
 403         /**
 404          * Compare device type of the device with the list of
 405          * supported types of the device_driver.
 406          */
 407         for (id = ap_drv->ids; id->match_flags; id++) {
 408                 if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) &&
 409                     (id->dev_type != ap_dev->device_type))
 410                         continue;
 411                 return 1;
 412         }
 413         return 0;
 414 }
 415
 416 /**
 417  * uevent function for AP devices. It sets up a single environment
 418  * variable DEV_TYPE which contains the hardware device type.
 419  */
 420 static int ap_uevent (struct device *dev, char **envp, int num_envp,
 421                        char *buffer, int buffer_size)
 422 {
 423         struct ap_device *ap_dev = to_ap_dev(dev);
 424         int length;
 425
 426         if (!ap_dev)
 427                 return -ENODEV;
 428
 429         /* Set up DEV_TYPE environment variable. */
 430         envp[0] = buffer;
 431         length = scnprintf(buffer, buffer_size, "DEV_TYPE=%04X",
 432                            ap_dev->device_type);
 433         if (buffer_size - length <= 0)
 434                 return -ENOMEM;
 435         buffer += length;
 436         buffer_size -= length;
 437         /* Add MODALIAS= */
 438         envp[1] = buffer;
 439         length = scnprintf(buffer, buffer_size, "MODALIAS=ap:t%02X",
 440                            ap_dev->device_type);
 441         if (buffer_size - length <= 0)
 442                 return -ENOMEM;
 443         envp[2] = NULL;
 444         return 0;
 445 }
 446
 447 static struct bus_type ap_bus_type = {
 448         .name = "ap",
 449         .match = &ap_bus_match,
 450         .uevent = &ap_uevent,
 451 };
 452
 453 static int ap_device_probe(struct device *dev)
 454 {
 455         struct ap_device *ap_dev = to_ap_dev(dev);
 456         struct ap_driver *ap_drv = to_ap_drv(dev->driver);
 457         int rc;
 458
 459         ap_dev->drv = ap_drv;
 460         rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
 461         return rc;
 462 }
 463
 464 /**
 465  * Flush all requests from the request/pending queue of an AP device.
 466  * @ap_dev: pointer to the AP device.
 467  */
 468 static void __ap_flush_queue(struct ap_device *ap_dev)
 469 {
 470         struct ap_message *ap_msg, *next;
 471
 472         list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) {
 473                 list_del_init(&ap_msg->list);
 474                 ap_dev->pendingq_count--;
 475                 ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
 476         }
 477         list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) {
 478                 list_del_init(&ap_msg->list);
 479                 ap_dev->requestq_count--;
 480                 ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
 481         }
 482 }
 483
 484 void ap_flush_queue(struct ap_device *ap_dev)
 485 {
 486         spin_lock_bh(&ap_dev->lock);
 487         __ap_flush_queue(ap_dev);
 488         spin_unlock_bh(&ap_dev->lock);
 489 }
 490 EXPORT_SYMBOL(ap_flush_queue);
 491
 492 static int ap_device_remove(struct device *dev)
 493 {
 494         struct ap_device *ap_dev = to_ap_dev(dev);
 495         struct ap_driver *ap_drv = ap_dev->drv;
 496
 497         ap_flush_queue(ap_dev);
 498         if (ap_drv->remove)
 499                 ap_drv->remove(ap_dev);
 500         return 0;
 501 }
 502
 503 int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
 504                        char *name)
 505 {
 506         struct device_driver *drv = &ap_drv->driver;
 507
 508         drv->bus = &ap_bus_type;
 509         drv->probe = ap_device_probe;
 510         drv->remove = ap_device_remove;
 511         drv->owner = owner;
 512         drv->name = name;
 513         return driver_register(drv);
 514 }
 515 EXPORT_SYMBOL(ap_driver_register);
 516
 517 void ap_driver_unregister(struct ap_driver *ap_drv)
 518 {
 519         driver_unregister(&ap_drv->driver);
 520 }
 521 EXPORT_SYMBOL(ap_driver_unregister);
 522
 523 /**
 524  * AP bus attributes.
 525  */
 526 static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
 527 {
 528         return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
 529 }
 530
 531 static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL);
 532
 533 static ssize_t ap_config_time_show(struct bus_type *bus, char *buf)
 534 {
 535         return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
 536 }
 537
 538 static ssize_t ap_config_time_store(struct bus_type *bus,
 539                                     const char *buf, size_t count)
 540 {
 541         int time;
 542
 543         if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
 544                 return -EINVAL;
 545         ap_config_time = time;
 546         if (!timer_pending(&ap_config_timer) ||
 547             !mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) {
 548                 ap_config_timer.expires = jiffies + ap_config_time * HZ;
 549                 add_timer(&ap_config_timer);
 550         }
 551         return count;
 552 }
 553
 554 static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store);
 555
 556 static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf)
 557 {
 558         return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
 559 }
 560
 561 static ssize_t ap_poll_thread_store(struct bus_type *bus,
 562                                     const char *buf, size_t count)
 563 {
 564         int flag, rc;
 565
 566         if (sscanf(buf, "%d\n", &flag) != 1)
 567                 return -EINVAL;
 568         if (flag) {
 569                 rc = ap_poll_thread_start();
 570                 if (rc)
 571                         return rc;
 572         }
 573         else
 574                 ap_poll_thread_stop();
 575         return count;
 576 }
 577
 578 static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store);
 579
 580 static struct bus_attribute *const ap_bus_attrs[] = {
 581         &bus_attr_ap_domain,
 582         &bus_attr_config_time,
 583         &bus_attr_poll_thread,
 584         NULL
 585 };
 586
 587 /**
 588  * Pick one of the 16 ap domains.
 589  */
 590 static int ap_select_domain(void)
 591 {
 592         int queue_depth, device_type, count, max_count, best_domain;
 593         int rc, i, j;
 594
 595         /**
 596          * We want to use a single domain. Either the one specified with
 597          * the "domain=" parameter or the domain with the maximum number
 598          * of devices.
 599          */
 600         if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS)
 601                 /* Domain has already been selected. */
 602                 return 0;
 603         best_domain = -1;
 604         max_count = 0;
 605         for (i = 0; i < AP_DOMAINS; i++) {
 606                 count = 0;
 607                 for (j = 0; j < AP_DEVICES; j++) {
 608                         ap_qid_t qid = AP_MKQID(j, i);
 609                         rc = ap_query_queue(qid, &queue_depth, &device_type);
 610                         if (rc)
 611                                 continue;
 612                         count++;
 613                 }
 614                 if (count > max_count) {
 615                         max_count = count;
 616                         best_domain = i;
 617                 }
 618         }
 619         if (best_domain >= 0){
 620                 ap_domain_index = best_domain;
 621                 return 0;
 622         }
 623         return -ENODEV;
 624 }
 625
 626 /**
 627  * Find the device type if query queue returned a device type of 0.
 628  * @ap_dev: pointer to the AP device.
 629  */
 630 static int ap_probe_device_type(struct ap_device *ap_dev)
 631 {
 632         static unsigned char msg[] = {
 633                 0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,
 634                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 635                 0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,
 636                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 637                 0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50,
 638                 0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01,
 639                 0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00,
 640                 0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00,
 641                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 642                 0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00,
 643                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 644                 0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00,
 645                 0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00,
 646                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 647                 0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00,
 648                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 649                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 650                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 651                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 652                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 653                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 654                 0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00,
 655                 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 656                 0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,
 657                 0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20,
 658                 0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53,
 659                 0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22,
 660                 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
 661                 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,
 662                 0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66,
 663                 0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44,
 664                 0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22,
 665                 0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
 666                 0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77,
 667                 0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00,
 668                 0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00,
 669                 0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01,
 670                 0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c,
 671                 0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68,
 672                 0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66,
 673                 0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0,
 674                 0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8,
 675                 0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04,
 676                 0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57,
 677                 0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d,
 678         };
 679         struct ap_queue_status status;
 680         unsigned long long psmid;
 681         char *reply;
 682         int rc, i;
 683
 684         reply = (void *) get_zeroed_page(GFP_KERNEL);
 685         if (!reply) {
 686                 rc = -ENOMEM;
 687                 goto out;
 688         }
 689
 690         status = __ap_send(ap_dev->qid, 0x0102030405060708ULL,
 691                            msg, sizeof(msg));
 692         if (status.response_code != AP_RESPONSE_NORMAL) {
 693                 rc = -ENODEV;
 694                 goto out_free;
 695         }
 696
 697         /* Wait for the test message to complete. */
 698         for (i = 0; i < 6; i++) {
 699                 mdelay(300);
 700                 status = __ap_recv(ap_dev->qid, &psmid, reply, 4096);
 701                 if (status.response_code == AP_RESPONSE_NORMAL &&
 702                     psmid == 0x0102030405060708ULL)
 703                         break;
 704         }
 705         if (i < 6) {
 706                 /* Got an answer. */
 707                 if (reply[0] == 0x00 && reply[1] == 0x86)
 708                         ap_dev->device_type = AP_DEVICE_TYPE_PCICC;
 709                 else
 710                         ap_dev->device_type = AP_DEVICE_TYPE_PCICA;
 711                 rc = 0;
 712         } else
 713                 rc = -ENODEV;
 714
 715 out_free:
 716         free_page((unsigned long) reply);
 717 out:
 718         return rc;
 719 }
 720
 721 /**
 722  * Scan the ap bus for new devices.
 723  */
 724 static int __ap_scan_bus(struct device *dev, void *data)
 725 {
 726         return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data;
 727 }
 728
 729 static void ap_device_release(struct device *dev)
 730 {
 731         struct ap_device *ap_dev = to_ap_dev(dev);
 732
 733         kfree(ap_dev);
 734 }
 735
 736 static void ap_scan_bus(struct work_struct *unused)
 737 {
 738         struct ap_device *ap_dev;
 739         struct device *dev;
 740         ap_qid_t qid;
 741         int queue_depth, device_type;
 742         int rc, i;
 743
 744         if (ap_select_domain() != 0)
 745                 return;
 746         for (i = 0; i < AP_DEVICES; i++) {
 747                 qid = AP_MKQID(i, ap_domain_index);
 748                 dev = bus_find_device(&ap_bus_type, NULL,
 749                                       (void *)(unsigned long)qid,
 750                                       __ap_scan_bus);
 751                 rc = ap_query_queue(qid, &queue_depth, &device_type);
 752                 if (dev && rc) {
 753                         put_device(dev);
 754                         device_unregister(dev);
 755                         continue;
 756                 }
 757                 if (dev) {
 758                         put_device(dev);
 759                         continue;
 760                 }
 761                 if (rc)
 762                         continue;
 763                 rc = ap_init_queue(qid);
 764                 if (rc)
 765                         continue;
 766                 ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL);
 767                 if (!ap_dev)
 768                         break;
 769                 ap_dev->qid = qid;
 770                 ap_dev->queue_depth = queue_depth;
 771                 ap_dev->unregistered = 1;
 772                 spin_lock_init(&ap_dev->lock);
 773                 INIT_LIST_HEAD(&ap_dev->pendingq);
 774                 INIT_LIST_HEAD(&ap_dev->requestq);
 775                 if (device_type == 0)
 776                         ap_probe_device_type(ap_dev);
 777                 else
 778                         ap_dev->device_type = device_type;
 779
 780                 ap_dev->device.bus = &ap_bus_type;
 781                 ap_dev->device.parent = ap_root_device;
 782                 snprintf(ap_dev->device.bus_id, BUS_ID_SIZE, "card%02x",
 783                          AP_QID_DEVICE(ap_dev->qid));
 784                 ap_dev->device.release = ap_device_release;
 785                 rc = device_register(&ap_dev->device);
 786                 if (rc) {
 787                         kfree(ap_dev);
 788                         continue;
 789                 }
 790                 /* Add device attributes. */
 791                 rc = sysfs_create_group(&ap_dev->device.kobj,
 792                                         &ap_dev_attr_group);
 793                 if (!rc) {
 794                         spin_lock_bh(&ap_dev->lock);
 795                         ap_dev->unregistered = 0;
 796                         spin_unlock_bh(&ap_dev->lock);
 797                 }
 798                 else
 799                         device_unregister(&ap_dev->device);
 800         }
 801 }
 802
 803 static void
 804 ap_config_timeout(unsigned long ptr)
 805 {
 806         queue_work(ap_work_queue, &ap_config_work);
 807         ap_config_timer.expires = jiffies + ap_config_time * HZ;
 808         add_timer(&ap_config_timer);
 809 }
 810
 811 /**
 812  * Set up the timer to run the poll tasklet
 813  */
 814 static inline void ap_schedule_poll_timer(void)
 815 {
 816         if (timer_pending(&ap_poll_timer))
 817                 return;
 818         mod_timer(&ap_poll_timer, jiffies + AP_POLL_TIME);
 819 }
 820
 821 /**
 822  * Receive pending reply messages from an AP device.
 823  * @ap_dev: pointer to the AP device
 824  * @flags: pointer to control flags, bit 2^0 is set if another poll is
 825  *         required, bit 2^1 is set if the poll timer needs to get armed
 826  * Returns 0 if the device is still present, -ENODEV if not.
 827  */
 828 static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags)
 829 {
 830         struct ap_queue_status status;
 831         struct ap_message *ap_msg;
 832
 833         if (ap_dev->queue_count <= 0)
 834                 return 0;
 835         status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid,
 836                            ap_dev->reply->message, ap_dev->reply->length);
 837         switch (status.response_code) {
 838         case AP_RESPONSE_NORMAL:
 839                 atomic_dec(&ap_poll_requests);
 840                 ap_dev->queue_count--;
 841                 list_for_each_entry(ap_msg, &ap_dev->pendingq, list) {
 842                         if (ap_msg->psmid != ap_dev->reply->psmid)
 843                                 continue;
 844                         list_del_init(&ap_msg->list);
 845                         ap_dev->pendingq_count--;
 846                         ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply);
 847                         break;
 848                 }
 849                 if (ap_dev->queue_count > 0)
 850                         *flags |= 1;
 851                 break;
 852         case AP_RESPONSE_NO_PENDING_REPLY:
 853                 if (status.queue_empty) {
 854                         /* The card shouldn't forget requests but who knows. */
 855                         ap_dev->queue_count = 0;
 856                         list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
 857                         ap_dev->requestq_count += ap_dev->pendingq_count;
 858                         ap_dev->pendingq_count = 0;
 859                 } else
 860                         *flags |= 2;
 861                 break;
 862         default:
 863                 return -ENODEV;
 864         }
 865         return 0;
 866 }
 867
 868 /**
 869  * Send messages from the request queue to an AP device.
 870  * @ap_dev: pointer to the AP device
 871  * @flags: pointer to control flags, bit 2^0 is set if another poll is
 872  *         required, bit 2^1 is set if the poll timer needs to get armed
 873  * Returns 0 if the device is still present, -ENODEV if not.
 874  */
 875 static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags)
 876 {
 877         struct ap_queue_status status;
 878         struct ap_message *ap_msg;
 879
 880         if (ap_dev->requestq_count <= 0 ||
 881             ap_dev->queue_count >= ap_dev->queue_depth)
 882                 return 0;
 883         /* Start the next request on the queue. */
 884         ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list);
 885         status = __ap_send(ap_dev->qid, ap_msg->psmid,
 886                            ap_msg->message, ap_msg->length);
 887         switch (status.response_code) {
 888         case AP_RESPONSE_NORMAL:
 889                 atomic_inc(&ap_poll_requests);
 890                 ap_dev->queue_count++;
 891                 list_move_tail(&ap_msg->list, &ap_dev->pendingq);
 892                 ap_dev->requestq_count--;
 893                 ap_dev->pendingq_count++;
 894                 if (ap_dev->queue_count < ap_dev->queue_depth &&
 895                     ap_dev->requestq_count > 0)
 896                         *flags |= 1;
 897                 *flags |= 2;
 898                 break;
 899         case AP_RESPONSE_Q_FULL:
 900                 *flags |= 2;
 901                 break;
 902         case AP_RESPONSE_MESSAGE_TOO_BIG:
 903                 return -EINVAL;
 904         default:
 905                 return -ENODEV;
 906         }
 907         return 0;
 908 }
 909
 910 /**
 911  * Poll AP device for pending replies and send new messages. If either
 912  * ap_poll_read or ap_poll_write returns -ENODEV unregister the device.
 913  * @ap_dev: pointer to the bus device
 914  * @flags: pointer to control flags, bit 2^0 is set if another poll is
 915  *         required, bit 2^1 is set if the poll timer needs to get armed
 916  * Returns 0.
 917  */
 918 static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags)
 919 {
 920         int rc;
 921
 922         rc = ap_poll_read(ap_dev, flags);
 923         if (rc)
 924                 return rc;
 925         return ap_poll_write(ap_dev, flags);
 926 }
 927
 928 /**
 929  * Queue a message to a device.
 930  * @ap_dev: pointer to the AP device
 931  * @ap_msg: the message to be queued
 932  */
 933 static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
 934 {
 935         struct ap_queue_status status;
 936
 937         if (list_empty(&ap_dev->requestq) &&
 938             ap_dev->queue_count < ap_dev->queue_depth) {
 939                 status = __ap_send(ap_dev->qid, ap_msg->psmid,
 940                                    ap_msg->message, ap_msg->length);
 941                 switch (status.response_code) {
 942                 case AP_RESPONSE_NORMAL:
 943                         list_add_tail(&ap_msg->list, &ap_dev->pendingq);
 944                         atomic_inc(&ap_poll_requests);
 945                         ap_dev->pendingq_count++;
 946                         ap_dev->queue_count++;
 947                         ap_dev->total_request_count++;
 948                         break;
 949                 case AP_RESPONSE_Q_FULL:
 950                         list_add_tail(&ap_msg->list, &ap_dev->requestq);
 951                         ap_dev->requestq_count++;
 952                         ap_dev->total_request_count++;
 953                         return -EBUSY;
 954                 case AP_RESPONSE_MESSAGE_TOO_BIG:
 955                         ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL));
 956                         return -EINVAL;
 957                 default:        /* Device is gone. */
 958                         ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
 959                         return -ENODEV;
 960                 }
 961         } else {
 962                 list_add_tail(&ap_msg->list, &ap_dev->requestq);
 963                 ap_dev->requestq_count++;
 964                 ap_dev->total_request_count++;
 965                 return -EBUSY;
 966         }
 967         ap_schedule_poll_timer();
 968         return 0;
 969 }
 970
 971 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
 972 {
 973         unsigned long flags;
 974         int rc;
 975
 976         spin_lock_bh(&ap_dev->lock);
 977         if (!ap_dev->unregistered) {
 978                 /* Make room on the queue by polling for finished requests. */
 979                 rc = ap_poll_queue(ap_dev, &flags);
 980                 if (!rc)
 981                         rc = __ap_queue_message(ap_dev, ap_msg);
 982                 if (!rc)
 983                         wake_up(&ap_poll_wait);
 984                 if (rc == -ENODEV)
 985                         ap_dev->unregistered = 1;
 986         } else {
 987                 ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
 988                 rc = 0;
 989         }
 990         spin_unlock_bh(&ap_dev->lock);
 991         if (rc == -ENODEV)
 992                 device_unregister(&ap_dev->device);
 993 }
 994 EXPORT_SYMBOL(ap_queue_message);
 995
 996 /**
 997  * Cancel a crypto request. This is done by removing the request
 998  * from the devive pendingq or requestq queue. Note that the
 999  * request stays on the AP queue. When it finishes the message
1000  * reply will be discarded because the psmid can't be found.
1001  * @ap_dev: AP device that has the message queued
1002  * @ap_msg: the message that is to be removed
1003  */
1004 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
1005 {
1006         struct ap_message *tmp;
1007
1008         spin_lock_bh(&ap_dev->lock);
1009         if (!list_empty(&ap_msg->list)) {
1010                 list_for_each_entry(tmp, &ap_dev->pendingq, list)
1011                         if (tmp->psmid == ap_msg->psmid) {
1012                                 ap_dev->pendingq_count--;
1013                                 goto found;
1014                         }
1015                 ap_dev->requestq_count--;
1016         found:
1017                 list_del_init(&ap_msg->list);
1018         }
1019         spin_unlock_bh(&ap_dev->lock);
1020 }
1021 EXPORT_SYMBOL(ap_cancel_message);
1022
1023 /**
1024  * AP receive polling for finished AP requests
1025  */
1026 static void ap_poll_timeout(unsigned long unused)
1027 {
1028         tasklet_schedule(&ap_tasklet);
1029 }
1030
1031 /**
1032  * Poll all AP devices on the bus in a round robin fashion. Continue
1033  * polling until bit 2^0 of the control flags is not set. If bit 2^1
1034  * of the control flags has been set arm the poll timer.
1035  */
1036 static int __ap_poll_all(struct device *dev, void *data)
1037 {
1038         struct ap_device *ap_dev = to_ap_dev(dev);
1039         int rc;
1040
1041         spin_lock(&ap_dev->lock);
1042         if (!ap_dev->unregistered) {
1043                 rc = ap_poll_queue(to_ap_dev(dev), (unsigned long *) data);
1044                 if (rc)
1045                         ap_dev->unregistered = 1;
1046         } else
1047                 rc = 0;
1048         spin_unlock(&ap_dev->lock);
1049         if (rc)
1050                 device_unregister(&ap_dev->device);
1051         return 0;
1052 }
1053
1054 static void ap_poll_all(unsigned long dummy)
1055 {
1056         unsigned long flags;
1057
1058         do {
1059                 flags = 0;
1060                 bus_for_each_dev(&ap_bus_type, NULL, &flags, __ap_poll_all);
1061         } while (flags & 1);
1062         if (flags & 2)
1063                 ap_schedule_poll_timer();
1064 }
1065
1066 /**
1067  * AP bus poll thread. The purpose of this thread is to poll for
1068  * finished requests in a loop if there is a "free" cpu - that is
1069  * a cpu that doesn't have anything better to do. The polling stops
1070  * as soon as there is another task or if all messages have been
1071  * delivered.
1072  */
1073 static int ap_poll_thread(void *data)
1074 {
1075         DECLARE_WAITQUEUE(wait, current);
1076         unsigned long flags;
1077         int requests;
1078
1079         set_user_nice(current, 19);
1080         while (1) {
1081                 if (need_resched()) {
1082                         schedule();
1083                         continue;
1084                 }
1085                 add_wait_queue(&ap_poll_wait, &wait);
1086                 set_current_state(TASK_INTERRUPTIBLE);
1087                 if (kthread_should_stop())
1088                         break;
1089                 requests = atomic_read(&ap_poll_requests);
1090                 if (requests <= 0)
1091                         schedule();
1092                 set_current_state(TASK_RUNNING);
1093                 remove_wait_queue(&ap_poll_wait, &wait);
1094
1095                 local_bh_disable();
1096                 flags = 0;
1097                 bus_for_each_dev(&ap_bus_type, NULL, &flags, __ap_poll_all);
1098                 local_bh_enable();
1099         }
1100         set_current_state(TASK_RUNNING);
1101         remove_wait_queue(&ap_poll_wait, &wait);
1102         return 0;
1103 }
1104
1105 static int ap_poll_thread_start(void)
1106 {
1107         int rc;
1108
1109         mutex_lock(&ap_poll_thread_mutex);
1110         if (!ap_poll_kthread) {
1111                 ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
1112                 rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0;
1113                 if (rc)
1114                         ap_poll_kthread = NULL;
1115         }
1116         else
1117                 rc = 0;
1118         mutex_unlock(&ap_poll_thread_mutex);
1119         return rc;
1120 }
1121
1122 static void ap_poll_thread_stop(void)
1123 {
1124         mutex_lock(&ap_poll_thread_mutex);
1125         if (ap_poll_kthread) {
1126                 kthread_stop(ap_poll_kthread);
1127                 ap_poll_kthread = NULL;
1128         }
1129         mutex_unlock(&ap_poll_thread_mutex);
1130 }
1131
1132 static void ap_reset_domain(void)
1133 {
1134         int i;
1135
1136         for (i = 0; i < AP_DEVICES; i++)
1137                 ap_reset_queue(AP_MKQID(i, ap_domain_index));
1138 }
1139
1140 static void ap_reset_all(void)
1141 {
1142         int i, j;
1143
1144         for (i = 0; i < AP_DOMAINS; i++)
1145                 for (j = 0; j < AP_DEVICES; j++)
1146                         ap_reset_queue(AP_MKQID(j, i));
1147 }
1148
1149 static struct reset_call ap_reset_call = {
1150         .fn = ap_reset_all,
1151 };
1152
1153 /**
1154  * The module initialization code.
1155  */
1156 int __init ap_module_init(void)
1157 {
1158         int rc, i;
1159
1160         if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) {
1161                 printk(KERN_WARNING "Invalid param: domain = %d. "
1162                        " Not loading.\n", ap_domain_index);
1163                 return -EINVAL;
1164         }
1165         if (ap_instructions_available() != 0) {
1166                 printk(KERN_WARNING "AP instructions not installed.\n");
1167                 return -ENODEV;
1168         }
1169         register_reset_call(&ap_reset_call);
1170
1171         /* Create /sys/bus/ap. */
1172         rc = bus_register(&ap_bus_type);
1173         if (rc)
1174                 goto out;
1175         for (i = 0; ap_bus_attrs[i]; i++) {
1176                 rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
1177                 if (rc)
1178                         goto out_bus;
1179         }
1180
1181         /* Create /sys/devices/ap. */
1182         ap_root_device = s390_root_dev_register("ap");
1183         rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0;
1184         if (rc)
1185                 goto out_bus;
1186
1187         ap_work_queue = create_singlethread_workqueue("kapwork");
1188         if (!ap_work_queue) {
1189                 rc = -ENOMEM;
1190                 goto out_root;
1191         }
1192
1193         if (ap_select_domain() == 0)
1194                 ap_scan_bus(NULL);
1195
1196         /* Setup the ap bus rescan timer. */
1197         init_timer(&ap_config_timer);
1198         ap_config_timer.function = ap_config_timeout;
1199         ap_config_timer.data = 0;
1200         ap_config_timer.expires = jiffies + ap_config_time * HZ;
1201         add_timer(&ap_config_timer);
1202
1203         /* Start the low priority AP bus poll thread. */
1204         if (ap_thread_flag) {
1205                 rc = ap_poll_thread_start();
1206                 if (rc)
1207                         goto out_work;
1208         }
1209
1210         return 0;
1211
1212 out_work:
1213         del_timer_sync(&ap_config_timer);
1214         del_timer_sync(&ap_poll_timer);
1215         destroy_workqueue(ap_work_queue);
1216 out_root:
1217         s390_root_dev_unregister(ap_root_device);
1218 out_bus:
1219         while (i--)
1220                 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
1221         bus_unregister(&ap_bus_type);
1222 out:
1223         unregister_reset_call(&ap_reset_call);
1224         return rc;
1225 }
1226
1227 static int __ap_match_all(struct device *dev, void *data)
1228 {
1229         return 1;
1230 }
1231
1232 /**
1233  * The module termination code
1234  */
1235 void ap_module_exit(void)
1236 {
1237         int i;
1238         struct device *dev;
1239
1240         ap_reset_domain();
1241         ap_poll_thread_stop();
1242         del_timer_sync(&ap_config_timer);
1243         del_timer_sync(&ap_poll_timer);
1244         destroy_workqueue(ap_work_queue);
1245         tasklet_kill(&ap_tasklet);
1246         s390_root_dev_unregister(ap_root_device);
1247         while ((dev = bus_find_device(&ap_bus_type, NULL, NULL,
1248                     __ap_match_all)))
1249         {
1250                 device_unregister(dev);
1251                 put_device(dev);
1252         }
1253         for (i = 0; ap_bus_attrs[i]; i++)
1254                 bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
1255         bus_unregister(&ap_bus_type);
1256         unregister_reset_call(&ap_reset_call);
1257 }
1258
1259 #ifndef CONFIG_ZCRYPT_MONOLITHIC
1260 module_init(ap_module_init);
1261 module_exit(ap_module_exit);
1262 #endif