net/iucv/iucv.c

   1 /*
   2  * IUCV base infrastructure.
   3  *
   4  * Copyright IBM Corp. 2001, 2009
   5  *
   6  * Author(s):
   7  *    Original source:
   8  *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
   9  *      Xenia Tkatschow (xenia@us.ibm.com)
  10  *    2Gb awareness and general cleanup:
  11  *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
  12  *    Rewritten for af_iucv:
  13  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
  14  *    PM functions:
  15  *      Ursula Braun (ursula.braun@de.ibm.com)
  16  *
  17  * Documentation used:
  18  *    The original source
  19  *    CP Programming Service, IBM document # SC24-5760
  20  *
  21  * This program is free software; you can redistribute it and/or modify
  22  * it under the terms of the GNU General Public License as published by
  23  * the Free Software Foundation; either version 2, or (at your option)
  24  * any later version.
  25  *
  26  * This program is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with this program; if not, write to the Free Software
  33  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  34  */
  35
  36 #define KMSG_COMPONENT "iucv"
  37 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  38
  39 #include <linux/kernel_stat.h>
  40 #include <linux/module.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/kernel.h>
  44 #include <linux/slab.h>
  45 #include <linux/init.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/list.h>
  48 #include <linux/errno.h>
  49 #include <linux/err.h>
  50 #include <linux/device.h>
  51 #include <linux/cpu.h>
  52 #include <linux/reboot.h>
  53 #include <net/iucv/iucv.h>
  54 #include <linux/atomic.h>
  55 #include <asm/ebcdic.h>
  56 #include <asm/io.h>
  57 #include <asm/irq.h>
  58 #include <asm/smp.h>
  59
  60 /*
  61  * FLAGS:
  62  * All flags are defined in the field IPFLAGS1 of each function
  63  * and can be found in CP Programming Services.
  64  * IPSRCCLS - Indicates you have specified a source class.
  65  * IPTRGCLS - Indicates you have specified a target class.
  66  * IPFGPID  - Indicates you have specified a pathid.
  67  * IPFGMID  - Indicates you have specified a message ID.
  68  * IPNORPY  - Indicates a one-way message. No reply expected.
  69  * IPALL    - Indicates that all paths are affected.
  70  */
  71 #define IUCV_IPSRCCLS   0x01
  72 #define IUCV_IPTRGCLS   0x01
  73 #define IUCV_IPFGPID    0x02
  74 #define IUCV_IPFGMID    0x04
  75 #define IUCV_IPNORPY    0x10
  76 #define IUCV_IPALL      0x80
  77
  78 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
  79 {
  80         return 0;
  81 }
  82
  83 enum iucv_pm_states {
  84         IUCV_PM_INITIAL = 0,
  85         IUCV_PM_FREEZING = 1,
  86         IUCV_PM_THAWING = 2,
  87         IUCV_PM_RESTORING = 3,
  88 };
  89 static enum iucv_pm_states iucv_pm_state;
  90
  91 static int iucv_pm_prepare(struct device *);
  92 static void iucv_pm_complete(struct device *);
  93 static int iucv_pm_freeze(struct device *);
  94 static int iucv_pm_thaw(struct device *);
  95 static int iucv_pm_restore(struct device *);
  96
  97 static const struct dev_pm_ops iucv_pm_ops = {
  98         .prepare = iucv_pm_prepare,
  99         .complete = iucv_pm_complete,
 100         .freeze = iucv_pm_freeze,
 101         .thaw = iucv_pm_thaw,
 102         .restore = iucv_pm_restore,
 103 };
 104
 105 struct bus_type iucv_bus = {
 106         .name = "iucv",
 107         .match = iucv_bus_match,
 108         .pm = &iucv_pm_ops,
 109 };
 110 EXPORT_SYMBOL(iucv_bus);
 111
 112 struct device *iucv_root;
 113 EXPORT_SYMBOL(iucv_root);
 114
 115 static int iucv_available;
 116
 117 /* General IUCV interrupt structure */
 118 struct iucv_irq_data {
 119         u16 ippathid;
 120         u8  ipflags1;
 121         u8  iptype;
 122         u32 res2[8];
 123 };
 124
 125 struct iucv_irq_list {
 126         struct list_head list;
 127         struct iucv_irq_data data;
 128 };
 129
 130 static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
 131 static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
 132 static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
 133
 134 /*
 135  * Queue of interrupt buffers lock for delivery via the tasklet
 136  * (fast but can't call smp_call_function).
 137  */
 138 static LIST_HEAD(iucv_task_queue);
 139
 140 /*
 141  * The tasklet for fast delivery of iucv interrupts.
 142  */
 143 static void iucv_tasklet_fn(unsigned long);
 144 static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
 145
 146 /*
 147  * Queue of interrupt buffers for delivery via a work queue
 148  * (slower but can call smp_call_function).
 149  */
 150 static LIST_HEAD(iucv_work_queue);
 151
 152 /*
 153  * The work element to deliver path pending interrupts.
 154  */
 155 static void iucv_work_fn(struct work_struct *work);
 156 static DECLARE_WORK(iucv_work, iucv_work_fn);
 157
 158 /*
 159  * Spinlock protecting task and work queue.
 160  */
 161 static DEFINE_SPINLOCK(iucv_queue_lock);
 162
 163 enum iucv_command_codes {
 164         IUCV_QUERY = 0,
 165         IUCV_RETRIEVE_BUFFER = 2,
 166         IUCV_SEND = 4,
 167         IUCV_RECEIVE = 5,
 168         IUCV_REPLY = 6,
 169         IUCV_REJECT = 8,
 170         IUCV_PURGE = 9,
 171         IUCV_ACCEPT = 10,
 172         IUCV_CONNECT = 11,
 173         IUCV_DECLARE_BUFFER = 12,
 174         IUCV_QUIESCE = 13,
 175         IUCV_RESUME = 14,
 176         IUCV_SEVER = 15,
 177         IUCV_SETMASK = 16,
 178         IUCV_SETCONTROLMASK = 17,
 179 };
 180
 181 /*
 182  * Error messages that are used with the iucv_sever function. They get
 183  * converted to EBCDIC.
 184  */
 185 static char iucv_error_no_listener[16] = "NO LISTENER";
 186 static char iucv_error_no_memory[16] = "NO MEMORY";
 187 static char iucv_error_pathid[16] = "INVALID PATHID";
 188
 189 /*
 190  * iucv_handler_list: List of registered handlers.
 191  */
 192 static LIST_HEAD(iucv_handler_list);
 193
 194 /*
 195  * iucv_path_table: an array of iucv_path structures.
 196  */
 197 static struct iucv_path **iucv_path_table;
 198 static unsigned long iucv_max_pathid;
 199
 200 /*
 201  * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
 202  */
 203 static DEFINE_SPINLOCK(iucv_table_lock);
 204
 205 /*
 206  * iucv_active_cpu: contains the number of the cpu executing the tasklet
 207  * or the work handler. Needed for iucv_path_sever called from tasklet.
 208  */
 209 static int iucv_active_cpu = -1;
 210
 211 /*
 212  * Mutex and wait queue for iucv_register/iucv_unregister.
 213  */
 214 static DEFINE_MUTEX(iucv_register_mutex);
 215
 216 /*
 217  * Counter for number of non-smp capable handlers.
 218  */
 219 static int iucv_nonsmp_handler;
 220
 221 /*
 222  * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
 223  * iucv_path_quiesce and iucv_path_sever.
 224  */
 225 struct iucv_cmd_control {
 226         u16 ippathid;
 227         u8  ipflags1;
 228         u8  iprcode;
 229         u16 ipmsglim;
 230         u16 res1;
 231         u8  ipvmid[8];
 232         u8  ipuser[16];
 233         u8  iptarget[8];
 234 } __attribute__ ((packed,aligned(8)));
 235
 236 /*
 237  * Data in parameter list iucv structure. Used by iucv_message_send,
 238  * iucv_message_send2way and iucv_message_reply.
 239  */
 240 struct iucv_cmd_dpl {
 241         u16 ippathid;
 242         u8  ipflags1;
 243         u8  iprcode;
 244         u32 ipmsgid;
 245         u32 iptrgcls;
 246         u8  iprmmsg[8];
 247         u32 ipsrccls;
 248         u32 ipmsgtag;
 249         u32 ipbfadr2;
 250         u32 ipbfln2f;
 251         u32 res;
 252 } __attribute__ ((packed,aligned(8)));
 253
 254 /*
 255  * Data in buffer iucv structure. Used by iucv_message_receive,
 256  * iucv_message_reject, iucv_message_send, iucv_message_send2way
 257  * and iucv_declare_cpu.
 258  */
 259 struct iucv_cmd_db {
 260         u16 ippathid;
 261         u8  ipflags1;
 262         u8  iprcode;
 263         u32 ipmsgid;
 264         u32 iptrgcls;
 265         u32 ipbfadr1;
 266         u32 ipbfln1f;
 267         u32 ipsrccls;
 268         u32 ipmsgtag;
 269         u32 ipbfadr2;
 270         u32 ipbfln2f;
 271         u32 res;
 272 } __attribute__ ((packed,aligned(8)));
 273
 274 /*
 275  * Purge message iucv structure. Used by iucv_message_purge.
 276  */
 277 struct iucv_cmd_purge {
 278         u16 ippathid;
 279         u8  ipflags1;
 280         u8  iprcode;
 281         u32 ipmsgid;
 282         u8  ipaudit[3];
 283         u8  res1[5];
 284         u32 res2;
 285         u32 ipsrccls;
 286         u32 ipmsgtag;
 287         u32 res3[3];
 288 } __attribute__ ((packed,aligned(8)));
 289
 290 /*
 291  * Set mask iucv structure. Used by iucv_enable_cpu.
 292  */
 293 struct iucv_cmd_set_mask {
 294         u8  ipmask;
 295         u8  res1[2];
 296         u8  iprcode;
 297         u32 res2[9];
 298 } __attribute__ ((packed,aligned(8)));
 299
 300 union iucv_param {
 301         struct iucv_cmd_control ctrl;
 302         struct iucv_cmd_dpl dpl;
 303         struct iucv_cmd_db db;
 304         struct iucv_cmd_purge purge;
 305         struct iucv_cmd_set_mask set_mask;
 306 };
 307
 308 /*
 309  * Anchor for per-cpu IUCV command parameter block.
 310  */
 311 static union iucv_param *iucv_param[NR_CPUS];
 312 static union iucv_param *iucv_param_irq[NR_CPUS];
 313
 314 /**
 315  * iucv_call_b2f0
 316  * @code: identifier of IUCV call to CP.
 317  * @parm: pointer to a struct iucv_parm block
 318  *
 319  * Calls CP to execute IUCV commands.
 320  *
 321  * Returns the result of the CP IUCV call.
 322  */
 323 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
 324 {
 325         register unsigned long reg0 asm ("0");
 326         register unsigned long reg1 asm ("1");
 327         int ccode;
 328
 329         reg0 = command;
 330         reg1 = virt_to_phys(parm);
 331         asm volatile(
 332                 "       .long 0xb2f01000\n"
 333                 "       ipm     %0\n"
 334                 "       srl     %0,28\n"
 335                 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
 336                 :  "m" (*parm) : "cc");
 337         return (ccode == 1) ? parm->ctrl.iprcode : ccode;
 338 }
 339
 340 /**
 341  * iucv_query_maxconn
 342  *
 343  * Determines the maximum number of connections that may be established.
 344  *
 345  * Returns the maximum number of connections or -EPERM is IUCV is not
 346  * available.
 347  */
 348 static int iucv_query_maxconn(void)
 349 {
 350         register unsigned long reg0 asm ("0");
 351         register unsigned long reg1 asm ("1");
 352         void *param;
 353         int ccode;
 354
 355         param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
 356         if (!param)
 357                 return -ENOMEM;
 358         reg0 = IUCV_QUERY;
 359         reg1 = (unsigned long) param;
 360         asm volatile (
 361                 "       .long   0xb2f01000\n"
 362                 "       ipm     %0\n"
 363                 "       srl     %0,28\n"
 364                 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
 365         if (ccode == 0)
 366                 iucv_max_pathid = reg1;
 367         kfree(param);
 368         return ccode ? -EPERM : 0;
 369 }
 370
 371 /**
 372  * iucv_allow_cpu
 373  * @data: unused
 374  *
 375  * Allow iucv interrupts on this cpu.
 376  */
 377 static void iucv_allow_cpu(void *data)
 378 {
 379         int cpu = smp_processor_id();
 380         union iucv_param *parm;
 381
 382         /*
 383          * Enable all iucv interrupts.
 384          * ipmask contains bits for the different interrupts
 385          *      0x80 - Flag to allow nonpriority message pending interrupts
 386          *      0x40 - Flag to allow priority message pending interrupts
 387          *      0x20 - Flag to allow nonpriority message completion interrupts
 388          *      0x10 - Flag to allow priority message completion interrupts
 389          *      0x08 - Flag to allow IUCV control interrupts
 390          */
 391         parm = iucv_param_irq[cpu];
 392         memset(parm, 0, sizeof(union iucv_param));
 393         parm->set_mask.ipmask = 0xf8;
 394         iucv_call_b2f0(IUCV_SETMASK, parm);
 395
 396         /*
 397          * Enable all iucv control interrupts.
 398          * ipmask contains bits for the different interrupts
 399          *      0x80 - Flag to allow pending connections interrupts
 400          *      0x40 - Flag to allow connection complete interrupts
 401          *      0x20 - Flag to allow connection severed interrupts
 402          *      0x10 - Flag to allow connection quiesced interrupts
 403          *      0x08 - Flag to allow connection resumed interrupts
 404          */
 405         memset(parm, 0, sizeof(union iucv_param));
 406         parm->set_mask.ipmask = 0xf8;
 407         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
 408         /* Set indication that iucv interrupts are allowed for this cpu. */
 409         cpumask_set_cpu(cpu, &iucv_irq_cpumask);
 410 }
 411
 412 /**
 413  * iucv_block_cpu
 414  * @data: unused
 415  *
 416  * Block iucv interrupts on this cpu.
 417  */
 418 static void iucv_block_cpu(void *data)
 419 {
 420         int cpu = smp_processor_id();
 421         union iucv_param *parm;
 422
 423         /* Disable all iucv interrupts. */
 424         parm = iucv_param_irq[cpu];
 425         memset(parm, 0, sizeof(union iucv_param));
 426         iucv_call_b2f0(IUCV_SETMASK, parm);
 427
 428         /* Clear indication that iucv interrupts are allowed for this cpu. */
 429         cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
 430 }
 431
 432 /**
 433  * iucv_block_cpu_almost
 434  * @data: unused
 435  *
 436  * Allow connection-severed interrupts only on this cpu.
 437  */
 438 static void iucv_block_cpu_almost(void *data)
 439 {
 440         int cpu = smp_processor_id();
 441         union iucv_param *parm;
 442
 443         /* Allow iucv control interrupts only */
 444         parm = iucv_param_irq[cpu];
 445         memset(parm, 0, sizeof(union iucv_param));
 446         parm->set_mask.ipmask = 0x08;
 447         iucv_call_b2f0(IUCV_SETMASK, parm);
 448         /* Allow iucv-severed interrupt only */
 449         memset(parm, 0, sizeof(union iucv_param));
 450         parm->set_mask.ipmask = 0x20;
 451         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
 452
 453         /* Clear indication that iucv interrupts are allowed for this cpu. */
 454         cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
 455 }
 456
 457 /**
 458  * iucv_declare_cpu
 459  * @data: unused
 460  *
 461  * Declare a interrupt buffer on this cpu.
 462  */
 463 static void iucv_declare_cpu(void *data)
 464 {
 465         int cpu = smp_processor_id();
 466         union iucv_param *parm;
 467         int rc;
 468
 469         if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
 470                 return;
 471
 472         /* Declare interrupt buffer. */
 473         parm = iucv_param_irq[cpu];
 474         memset(parm, 0, sizeof(union iucv_param));
 475         parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
 476         rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
 477         if (rc) {
 478                 char *err = "Unknown";
 479                 switch (rc) {
 480                 case 0x03:
 481                         err = "Directory error";
 482                         break;
 483                 case 0x0a:
 484                         err = "Invalid length";
 485                         break;
 486                 case 0x13:
 487                         err = "Buffer already exists";
 488                         break;
 489                 case 0x3e:
 490                         err = "Buffer overlap";
 491                         break;
 492                 case 0x5c:
 493                         err = "Paging or storage error";
 494                         break;
 495                 }
 496                 pr_warning("Defining an interrupt buffer on CPU %i"
 497                            " failed with 0x%02x (%s)\n", cpu, rc, err);
 498                 return;
 499         }
 500
 501         /* Set indication that an iucv buffer exists for this cpu. */
 502         cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
 503
 504         if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
 505                 /* Enable iucv interrupts on this cpu. */
 506                 iucv_allow_cpu(NULL);
 507         else
 508                 /* Disable iucv interrupts on this cpu. */
 509                 iucv_block_cpu(NULL);
 510 }
 511
 512 /**
 513  * iucv_retrieve_cpu
 514  * @data: unused
 515  *
 516  * Retrieve interrupt buffer on this cpu.
 517  */
 518 static void iucv_retrieve_cpu(void *data)
 519 {
 520         int cpu = smp_processor_id();
 521         union iucv_param *parm;
 522
 523         if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
 524                 return;
 525
 526         /* Block iucv interrupts. */
 527         iucv_block_cpu(NULL);
 528
 529         /* Retrieve interrupt buffer. */
 530         parm = iucv_param_irq[cpu];
 531         iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
 532
 533         /* Clear indication that an iucv buffer exists for this cpu. */
 534         cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
 535 }
 536
 537 /**
 538  * iucv_setmask_smp
 539  *
 540  * Allow iucv interrupts on all cpus.
 541  */
 542 static void iucv_setmask_mp(void)
 543 {
 544         int cpu;
 545
 546         get_online_cpus();
 547         for_each_online_cpu(cpu)
 548                 /* Enable all cpus with a declared buffer. */
 549                 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
 550                     !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
 551                         smp_call_function_single(cpu, iucv_allow_cpu,
 552                                                  NULL, 1);
 553         put_online_cpus();
 554 }
 555
 556 /**
 557  * iucv_setmask_up
 558  *
 559  * Allow iucv interrupts on a single cpu.
 560  */
 561 static void iucv_setmask_up(void)
 562 {
 563         cpumask_t cpumask;
 564         int cpu;
 565
 566         /* Disable all cpu but the first in cpu_irq_cpumask. */
 567         cpumask_copy(&cpumask, &iucv_irq_cpumask);
 568         cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
 569         for_each_cpu(cpu, &cpumask)
 570                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
 571 }
 572
 573 /**
 574  * iucv_enable
 575  *
 576  * This function makes iucv ready for use. It allocates the pathid
 577  * table, declares an iucv interrupt buffer and enables the iucv
 578  * interrupts. Called when the first user has registered an iucv
 579  * handler.
 580  */
 581 static int iucv_enable(void)
 582 {
 583         size_t alloc_size;
 584         int cpu, rc;
 585
 586         get_online_cpus();
 587         rc = -ENOMEM;
 588         alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
 589         iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
 590         if (!iucv_path_table)
 591                 goto out;
 592         /* Declare per cpu buffers. */
 593         rc = -EIO;
 594         for_each_online_cpu(cpu)
 595                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
 596         if (cpumask_empty(&iucv_buffer_cpumask))
 597                 /* No cpu could declare an iucv buffer. */
 598                 goto out;
 599         put_online_cpus();
 600         return 0;
 601 out:
 602         kfree(iucv_path_table);
 603         iucv_path_table = NULL;
 604         put_online_cpus();
 605         return rc;
 606 }
 607
 608 /**
 609  * iucv_disable
 610  *
 611  * This function shuts down iucv. It disables iucv interrupts, retrieves
 612  * the iucv interrupt buffer and frees the pathid table. Called after the
 613  * last user unregister its iucv handler.
 614  */
 615 static void iucv_disable(void)
 616 {
 617         get_online_cpus();
 618         on_each_cpu(iucv_retrieve_cpu, NULL, 1);
 619         kfree(iucv_path_table);
 620         iucv_path_table = NULL;
 621         put_online_cpus();
 622 }
 623
 624 static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
 625                                      unsigned long action, void *hcpu)
 626 {
 627         cpumask_t cpumask;
 628         long cpu = (long) hcpu;
 629
 630         switch (action) {
 631         case CPU_UP_PREPARE:
 632         case CPU_UP_PREPARE_FROZEN:
 633                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
 634                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 635                 if (!iucv_irq_data[cpu])
 636                         return notifier_from_errno(-ENOMEM);
 637
 638                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
 639                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 640                 if (!iucv_param[cpu]) {
 641                         kfree(iucv_irq_data[cpu]);
 642                         iucv_irq_data[cpu] = NULL;
 643                         return notifier_from_errno(-ENOMEM);
 644                 }
 645                 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
 646                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 647                 if (!iucv_param_irq[cpu]) {
 648                         kfree(iucv_param[cpu]);
 649                         iucv_param[cpu] = NULL;
 650                         kfree(iucv_irq_data[cpu]);
 651                         iucv_irq_data[cpu] = NULL;
 652                         return notifier_from_errno(-ENOMEM);
 653                 }
 654                 break;
 655         case CPU_UP_CANCELED:
 656         case CPU_UP_CANCELED_FROZEN:
 657         case CPU_DEAD:
 658         case CPU_DEAD_FROZEN:
 659                 kfree(iucv_param_irq[cpu]);
 660                 iucv_param_irq[cpu] = NULL;
 661                 kfree(iucv_param[cpu]);
 662                 iucv_param[cpu] = NULL;
 663                 kfree(iucv_irq_data[cpu]);
 664                 iucv_irq_data[cpu] = NULL;
 665                 break;
 666         case CPU_ONLINE:
 667         case CPU_ONLINE_FROZEN:
 668         case CPU_DOWN_FAILED:
 669         case CPU_DOWN_FAILED_FROZEN:
 670                 if (!iucv_path_table)
 671                         break;
 672                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
 673                 break;
 674         case CPU_DOWN_PREPARE:
 675         case CPU_DOWN_PREPARE_FROZEN:
 676                 if (!iucv_path_table)
 677                         break;
 678                 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
 679                 cpumask_clear_cpu(cpu, &cpumask);
 680                 if (cpumask_empty(&cpumask))
 681                         /* Can't offline last IUCV enabled cpu. */
 682                         return notifier_from_errno(-EINVAL);
 683                 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
 684                 if (cpumask_empty(&iucv_irq_cpumask))
 685                         smp_call_function_single(
 686                                 cpumask_first(&iucv_buffer_cpumask),
 687                                 iucv_allow_cpu, NULL, 1);
 688                 break;
 689         }
 690         return NOTIFY_OK;
 691 }
 692
 693 static struct notifier_block __refdata iucv_cpu_notifier = {
 694         .notifier_call = iucv_cpu_notify,
 695 };
 696
 697 /**
 698  * iucv_sever_pathid
 699  * @pathid: path identification number.
 700  * @userdata: 16-bytes of user data.
 701  *
 702  * Sever an iucv path to free up the pathid. Used internally.
 703  */
 704 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
 705 {
 706         union iucv_param *parm;
 707
 708         parm = iucv_param_irq[smp_processor_id()];
 709         memset(parm, 0, sizeof(union iucv_param));
 710         if (userdata)
 711                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 712         parm->ctrl.ippathid = pathid;
 713         return iucv_call_b2f0(IUCV_SEVER, parm);
 714 }
 715
 716 /**
 717  * __iucv_cleanup_queue
 718  * @dummy: unused dummy argument
 719  *
 720  * Nop function called via smp_call_function to force work items from
 721  * pending external iucv interrupts to the work queue.
 722  */
 723 static void __iucv_cleanup_queue(void *dummy)
 724 {
 725 }
 726
 727 /**
 728  * iucv_cleanup_queue
 729  *
 730  * Function called after a path has been severed to find all remaining
 731  * work items for the now stale pathid. The caller needs to hold the
 732  * iucv_table_lock.
 733  */
 734 static void iucv_cleanup_queue(void)
 735 {
 736         struct iucv_irq_list *p, *n;
 737
 738         /*
 739          * When a path is severed, the pathid can be reused immediately
 740          * on a iucv connect or a connection pending interrupt. Remove
 741          * all entries from the task queue that refer to a stale pathid
 742          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
 743          * or deliver the connection pending interrupt. To get all the
 744          * pending interrupts force them to the work queue by calling
 745          * an empty function on all cpus.
 746          */
 747         smp_call_function(__iucv_cleanup_queue, NULL, 1);
 748         spin_lock_irq(&iucv_queue_lock);
 749         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
 750                 /* Remove stale work items from the task queue. */
 751                 if (iucv_path_table[p->data.ippathid] == NULL) {
 752                         list_del(&p->list);
 753                         kfree(p);
 754                 }
 755         }
 756         spin_unlock_irq(&iucv_queue_lock);
 757 }
 758
 759 /**
 760  * iucv_register:
 761  * @handler: address of iucv handler structure
 762  * @smp: != 0 indicates that the handler can deal with out of order messages
 763  *
 764  * Registers a driver with IUCV.
 765  *
 766  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 767  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 768  */
 769 int iucv_register(struct iucv_handler *handler, int smp)
 770 {
 771         int rc;
 772
 773         if (!iucv_available)
 774                 return -ENOSYS;
 775         mutex_lock(&iucv_register_mutex);
 776         if (!smp)
 777                 iucv_nonsmp_handler++;
 778         if (list_empty(&iucv_handler_list)) {
 779                 rc = iucv_enable();
 780                 if (rc)
 781                         goto out_mutex;
 782         } else if (!smp && iucv_nonsmp_handler == 1)
 783                 iucv_setmask_up();
 784         INIT_LIST_HEAD(&handler->paths);
 785
 786         spin_lock_bh(&iucv_table_lock);
 787         list_add_tail(&handler->list, &iucv_handler_list);
 788         spin_unlock_bh(&iucv_table_lock);
 789         rc = 0;
 790 out_mutex:
 791         mutex_unlock(&iucv_register_mutex);
 792         return rc;
 793 }
 794 EXPORT_SYMBOL(iucv_register);
 795
 796 /**
 797  * iucv_unregister
 798  * @handler:  address of iucv handler structure
 799  * @smp: != 0 indicates that the handler can deal with out of order messages
 800  *
 801  * Unregister driver from IUCV.
 802  */
 803 void iucv_unregister(struct iucv_handler *handler, int smp)
 804 {
 805         struct iucv_path *p, *n;
 806
 807         mutex_lock(&iucv_register_mutex);
 808         spin_lock_bh(&iucv_table_lock);
 809         /* Remove handler from the iucv_handler_list. */
 810         list_del_init(&handler->list);
 811         /* Sever all pathids still referring to the handler. */
 812         list_for_each_entry_safe(p, n, &handler->paths, list) {
 813                 iucv_sever_pathid(p->pathid, NULL);
 814                 iucv_path_table[p->pathid] = NULL;
 815                 list_del(&p->list);
 816                 iucv_path_free(p);
 817         }
 818         spin_unlock_bh(&iucv_table_lock);
 819         if (!smp)
 820                 iucv_nonsmp_handler--;
 821         if (list_empty(&iucv_handler_list))
 822                 iucv_disable();
 823         else if (!smp && iucv_nonsmp_handler == 0)
 824                 iucv_setmask_mp();
 825         mutex_unlock(&iucv_register_mutex);
 826 }
 827 EXPORT_SYMBOL(iucv_unregister);
 828
 829 static int iucv_reboot_event(struct notifier_block *this,
 830                              unsigned long event, void *ptr)
 831 {
 832         int i;
 833
 834         get_online_cpus();
 835         on_each_cpu(iucv_block_cpu, NULL, 1);
 836         preempt_disable();
 837         for (i = 0; i < iucv_max_pathid; i++) {
 838                 if (iucv_path_table[i])
 839                         iucv_sever_pathid(i, NULL);
 840         }
 841         preempt_enable();
 842         put_online_cpus();
 843         iucv_disable();
 844         return NOTIFY_DONE;
 845 }
 846
 847 static struct notifier_block iucv_reboot_notifier = {
 848         .notifier_call = iucv_reboot_event,
 849 };
 850
 851 /**
 852  * iucv_path_accept
 853  * @path: address of iucv path structure
 854  * @handler: address of iucv handler structure
 855  * @userdata: 16 bytes of data reflected to the communication partner
 856  * @private: private data passed to interrupt handlers for this path
 857  *
 858  * This function is issued after the user received a connection pending
 859  * external interrupt and now wishes to complete the IUCV communication path.
 860  *
 861  * Returns the result of the CP IUCV call.
 862  */
 863 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 864                      u8 userdata[16], void *private)
 865 {
 866         union iucv_param *parm;
 867         int rc;
 868
 869         local_bh_disable();
 870         if (cpumask_empty(&iucv_buffer_cpumask)) {
 871                 rc = -EIO;
 872                 goto out;
 873         }
 874         /* Prepare parameter block. */
 875         parm = iucv_param[smp_processor_id()];
 876         memset(parm, 0, sizeof(union iucv_param));
 877         parm->ctrl.ippathid = path->pathid;
 878         parm->ctrl.ipmsglim = path->msglim;
 879         if (userdata)
 880                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 881         parm->ctrl.ipflags1 = path->flags;
 882
 883         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
 884         if (!rc) {
 885                 path->private = private;
 886                 path->msglim = parm->ctrl.ipmsglim;
 887                 path->flags = parm->ctrl.ipflags1;
 888         }
 889 out:
 890         local_bh_enable();
 891         return rc;
 892 }
 893 EXPORT_SYMBOL(iucv_path_accept);
 894
 895 /**
 896  * iucv_path_connect
 897  * @path: address of iucv path structure
 898  * @handler: address of iucv handler structure
 899  * @userid: 8-byte user identification
 900  * @system: 8-byte target system identification
 901  * @userdata: 16 bytes of data reflected to the communication partner
 902  * @private: private data passed to interrupt handlers for this path
 903  *
 904  * This function establishes an IUCV path. Although the connect may complete
 905  * successfully, you are not able to use the path until you receive an IUCV
 906  * Connection Complete external interrupt.
 907  *
 908  * Returns the result of the CP IUCV call.
 909  */
 910 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 911                       u8 userid[8], u8 system[8], u8 userdata[16],
 912                       void *private)
 913 {
 914         union iucv_param *parm;
 915         int rc;
 916
 917         spin_lock_bh(&iucv_table_lock);
 918         iucv_cleanup_queue();
 919         if (cpumask_empty(&iucv_buffer_cpumask)) {
 920                 rc = -EIO;
 921                 goto out;
 922         }
 923         parm = iucv_param[smp_processor_id()];
 924         memset(parm, 0, sizeof(union iucv_param));
 925         parm->ctrl.ipmsglim = path->msglim;
 926         parm->ctrl.ipflags1 = path->flags;
 927         if (userid) {
 928                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
 929                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 930                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 931         }
 932         if (system) {
 933                 memcpy(parm->ctrl.iptarget, system,
 934                        sizeof(parm->ctrl.iptarget));
 935                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 936                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 937         }
 938         if (userdata)
 939                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 940
 941         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
 942         if (!rc) {
 943                 if (parm->ctrl.ippathid < iucv_max_pathid) {
 944                         path->pathid = parm->ctrl.ippathid;
 945                         path->msglim = parm->ctrl.ipmsglim;
 946                         path->flags = parm->ctrl.ipflags1;
 947                         path->handler = handler;
 948                         path->private = private;
 949                         list_add_tail(&path->list, &handler->paths);
 950                         iucv_path_table[path->pathid] = path;
 951                 } else {
 952                         iucv_sever_pathid(parm->ctrl.ippathid,
 953                                           iucv_error_pathid);
 954                         rc = -EIO;
 955                 }
 956         }
 957 out:
 958         spin_unlock_bh(&iucv_table_lock);
 959         return rc;
 960 }
 961 EXPORT_SYMBOL(iucv_path_connect);
 962
 963 /**
 964  * iucv_path_quiesce:
 965  * @path: address of iucv path structure
 966  * @userdata: 16 bytes of data reflected to the communication partner
 967  *
 968  * This function temporarily suspends incoming messages on an IUCV path.
 969  * You can later reactivate the path by invoking the iucv_resume function.
 970  *
 971  * Returns the result from the CP IUCV call.
 972  */
 973 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
 974 {
 975         union iucv_param *parm;
 976         int rc;
 977
 978         local_bh_disable();
 979         if (cpumask_empty(&iucv_buffer_cpumask)) {
 980                 rc = -EIO;
 981                 goto out;
 982         }
 983         parm = iucv_param[smp_processor_id()];
 984         memset(parm, 0, sizeof(union iucv_param));
 985         if (userdata)
 986                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 987         parm->ctrl.ippathid = path->pathid;
 988         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
 989 out:
 990         local_bh_enable();
 991         return rc;
 992 }
 993 EXPORT_SYMBOL(iucv_path_quiesce);
 994
 995 /**
 996  * iucv_path_resume:
 997  * @path: address of iucv path structure
 998  * @userdata: 16 bytes of data reflected to the communication partner
 999  *
1000  * This function resumes incoming messages on an IUCV path that has
1001  * been stopped with iucv_path_quiesce.
1002  *
1003  * Returns the result from the CP IUCV call.
1004  */
1005 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1006 {
1007         union iucv_param *parm;
1008         int rc;
1009
1010         local_bh_disable();
1011         if (cpumask_empty(&iucv_buffer_cpumask)) {
1012                 rc = -EIO;
1013                 goto out;
1014         }
1015         parm = iucv_param[smp_processor_id()];
1016         memset(parm, 0, sizeof(union iucv_param));
1017         if (userdata)
1018                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1019         parm->ctrl.ippathid = path->pathid;
1020         rc = iucv_call_b2f0(IUCV_RESUME, parm);
1021 out:
1022         local_bh_enable();
1023         return rc;
1024 }
1025
1026 /**
1027  * iucv_path_sever
1028  * @path: address of iucv path structure
1029  * @userdata: 16 bytes of data reflected to the communication partner
1030  *
1031  * This function terminates an IUCV path.
1032  *
1033  * Returns the result from the CP IUCV call.
1034  */
1035 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1036 {
1037         int rc;
1038
1039         preempt_disable();
1040         if (cpumask_empty(&iucv_buffer_cpumask)) {
1041                 rc = -EIO;
1042                 goto out;
1043         }
1044         if (iucv_active_cpu != smp_processor_id())
1045                 spin_lock_bh(&iucv_table_lock);
1046         rc = iucv_sever_pathid(path->pathid, userdata);
1047         iucv_path_table[path->pathid] = NULL;
1048         list_del_init(&path->list);
1049         if (iucv_active_cpu != smp_processor_id())
1050                 spin_unlock_bh(&iucv_table_lock);
1051 out:
1052         preempt_enable();
1053         return rc;
1054 }
1055 EXPORT_SYMBOL(iucv_path_sever);
1056
1057 /**
1058  * iucv_message_purge
1059  * @path: address of iucv path structure
1060  * @msg: address of iucv msg structure
1061  * @srccls: source class of message
1062  *
1063  * Cancels a message you have sent.
1064  *
1065  * Returns the result from the CP IUCV call.
1066  */
1067 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1068                        u32 srccls)
1069 {
1070         union iucv_param *parm;
1071         int rc;
1072
1073         local_bh_disable();
1074         if (cpumask_empty(&iucv_buffer_cpumask)) {
1075                 rc = -EIO;
1076                 goto out;
1077         }
1078         parm = iucv_param[smp_processor_id()];
1079         memset(parm, 0, sizeof(union iucv_param));
1080         parm->purge.ippathid = path->pathid;
1081         parm->purge.ipmsgid = msg->id;
1082         parm->purge.ipsrccls = srccls;
1083         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1084         rc = iucv_call_b2f0(IUCV_PURGE, parm);
1085         if (!rc) {
1086                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1087                 msg->tag = parm->purge.ipmsgtag;
1088         }
1089 out:
1090         local_bh_enable();
1091         return rc;
1092 }
1093 EXPORT_SYMBOL(iucv_message_purge);
1094
1095 /**
1096  * iucv_message_receive_iprmdata
1097  * @path: address of iucv path structure
1098  * @msg: address of iucv msg structure
1099  * @flags: how the message is received (IUCV_IPBUFLST)
1100  * @buffer: address of data buffer or address of struct iucv_array
1101  * @size: length of data buffer
1102  * @residual:
1103  *
1104  * Internal function used by iucv_message_receive and __iucv_message_receive
1105  * to receive RMDATA data stored in struct iucv_message.
1106  */
1107 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1108                                          struct iucv_message *msg,
1109                                          u8 flags, void *buffer,
1110                                          size_t size, size_t *residual)
1111 {
1112         struct iucv_array *array;
1113         u8 *rmmsg;
1114         size_t copy;
1115
1116         /*
1117          * Message is 8 bytes long and has been stored to the
1118          * message descriptor itself.
1119          */
1120         if (residual)
1121                 *residual = abs(size - 8);
1122         rmmsg = msg->rmmsg;
1123         if (flags & IUCV_IPBUFLST) {
1124                 /* Copy to struct iucv_array. */
1125                 size = (size < 8) ? size : 8;
1126                 for (array = buffer; size > 0; array++) {
1127                         copy = min_t(size_t, size, array->length);
1128                         memcpy((u8 *)(addr_t) array->address,
1129                                 rmmsg, copy);
1130                         rmmsg += copy;
1131                         size -= copy;
1132                 }
1133         } else {
1134                 /* Copy to direct buffer. */
1135                 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1136         }
1137         return 0;
1138 }
1139
1140 /**
1141  * __iucv_message_receive
1142  * @path: address of iucv path structure
1143  * @msg: address of iucv msg structure
1144  * @flags: how the message is received (IUCV_IPBUFLST)
1145  * @buffer: address of data buffer or address of struct iucv_array
1146  * @size: length of data buffer
1147  * @residual:
1148  *
1149  * This function receives messages that are being sent to you over
1150  * established paths. This function will deal with RMDATA messages
1151  * embedded in struct iucv_message as well.
1152  *
1153  * Locking:     no locking
1154  *
1155  * Returns the result from the CP IUCV call.
1156  */
1157 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1158                            u8 flags, void *buffer, size_t size, size_t *residual)
1159 {
1160         union iucv_param *parm;
1161         int rc;
1162
1163         if (msg->flags & IUCV_IPRMDATA)
1164                 return iucv_message_receive_iprmdata(path, msg, flags,
1165                                                      buffer, size, residual);
1166          if (cpumask_empty(&iucv_buffer_cpumask)) {
1167                 rc = -EIO;
1168                 goto out;
1169         }
1170         parm = iucv_param[smp_processor_id()];
1171         memset(parm, 0, sizeof(union iucv_param));
1172         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1173         parm->db.ipbfln1f = (u32) size;
1174         parm->db.ipmsgid = msg->id;
1175         parm->db.ippathid = path->pathid;
1176         parm->db.iptrgcls = msg->class;
1177         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1178                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1179         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1180         if (!rc || rc == 5) {
1181                 msg->flags = parm->db.ipflags1;
1182                 if (residual)
1183                         *residual = parm->db.ipbfln1f;
1184         }
1185 out:
1186         return rc;
1187 }
1188 EXPORT_SYMBOL(__iucv_message_receive);
1189
1190 /**
1191  * iucv_message_receive
1192  * @path: address of iucv path structure
1193  * @msg: address of iucv msg structure
1194  * @flags: how the message is received (IUCV_IPBUFLST)
1195  * @buffer: address of data buffer or address of struct iucv_array
1196  * @size: length of data buffer
1197  * @residual:
1198  *
1199  * This function receives messages that are being sent to you over
1200  * established paths. This function will deal with RMDATA messages
1201  * embedded in struct iucv_message as well.
1202  *
1203  * Locking:     local_bh_enable/local_bh_disable
1204  *
1205  * Returns the result from the CP IUCV call.
1206  */
1207 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1208                          u8 flags, void *buffer, size_t size, size_t *residual)
1209 {
1210         int rc;
1211
1212         if (msg->flags & IUCV_IPRMDATA)
1213                 return iucv_message_receive_iprmdata(path, msg, flags,
1214                                                      buffer, size, residual);
1215         local_bh_disable();
1216         rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1217         local_bh_enable();
1218         return rc;
1219 }
1220 EXPORT_SYMBOL(iucv_message_receive);
1221
1222 /**
1223  * iucv_message_reject
1224  * @path: address of iucv path structure
1225  * @msg: address of iucv msg structure
1226  *
1227  * The reject function refuses a specified message. Between the time you
1228  * are notified of a message and the time that you complete the message,
1229  * the message may be rejected.
1230  *
1231  * Returns the result from the CP IUCV call.
1232  */
1233 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1234 {
1235         union iucv_param *parm;
1236         int rc;
1237
1238         local_bh_disable();
1239         if (cpumask_empty(&iucv_buffer_cpumask)) {
1240                 rc = -EIO;
1241                 goto out;
1242         }
1243         parm = iucv_param[smp_processor_id()];
1244         memset(parm, 0, sizeof(union iucv_param));
1245         parm->db.ippathid = path->pathid;
1246         parm->db.ipmsgid = msg->id;
1247         parm->db.iptrgcls = msg->class;
1248         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1249         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1250 out:
1251         local_bh_enable();
1252         return rc;
1253 }
1254 EXPORT_SYMBOL(iucv_message_reject);
1255
1256 /**
1257  * iucv_message_reply
1258  * @path: address of iucv path structure
1259  * @msg: address of iucv msg structure
1260  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1261  * @reply: address of reply data buffer or address of struct iucv_array
1262  * @size: length of reply data buffer
1263  *
1264  * This function responds to the two-way messages that you receive. You
1265  * must identify completely the message to which you wish to reply. ie,
1266  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1267  * the parameter list.
1268  *
1269  * Returns the result from the CP IUCV call.
1270  */
1271 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1272                        u8 flags, void *reply, size_t size)
1273 {
1274         union iucv_param *parm;
1275         int rc;
1276
1277         local_bh_disable();
1278         if (cpumask_empty(&iucv_buffer_cpumask)) {
1279                 rc = -EIO;
1280                 goto out;
1281         }
1282         parm = iucv_param[smp_processor_id()];
1283         memset(parm, 0, sizeof(union iucv_param));
1284         if (flags & IUCV_IPRMDATA) {
1285                 parm->dpl.ippathid = path->pathid;
1286                 parm->dpl.ipflags1 = flags;
1287                 parm->dpl.ipmsgid = msg->id;
1288                 parm->dpl.iptrgcls = msg->class;
1289                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1290         } else {
1291                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1292                 parm->db.ipbfln1f = (u32) size;
1293                 parm->db.ippathid = path->pathid;
1294                 parm->db.ipflags1 = flags;
1295                 parm->db.ipmsgid = msg->id;
1296                 parm->db.iptrgcls = msg->class;
1297         }
1298         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1299 out:
1300         local_bh_enable();
1301         return rc;
1302 }
1303 EXPORT_SYMBOL(iucv_message_reply);
1304
1305 /**
1306  * __iucv_message_send
1307  * @path: address of iucv path structure
1308  * @msg: address of iucv msg structure
1309  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1310  * @srccls: source class of message
1311  * @buffer: address of send buffer or address of struct iucv_array
1312  * @size: length of send buffer
1313  *
1314  * This function transmits data to another application. Data to be
1315  * transmitted is in a buffer and this is a one-way message and the
1316  * receiver will not reply to the message.
1317  *
1318  * Locking:     no locking
1319  *
1320  * Returns the result from the CP IUCV call.
1321  */
1322 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1323                       u8 flags, u32 srccls, void *buffer, size_t size)
1324 {
1325         union iucv_param *parm;
1326         int rc;
1327
1328         if (cpumask_empty(&iucv_buffer_cpumask)) {
1329                 rc = -EIO;
1330                 goto out;
1331         }
1332         parm = iucv_param[smp_processor_id()];
1333         memset(parm, 0, sizeof(union iucv_param));
1334         if (flags & IUCV_IPRMDATA) {
1335                 /* Message of 8 bytes can be placed into the parameter list. */
1336                 parm->dpl.ippathid = path->pathid;
1337                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1338                 parm->dpl.iptrgcls = msg->class;
1339                 parm->dpl.ipsrccls = srccls;
1340                 parm->dpl.ipmsgtag = msg->tag;
1341                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1342         } else {
1343                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1344                 parm->db.ipbfln1f = (u32) size;
1345                 parm->db.ippathid = path->pathid;
1346                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1347                 parm->db.iptrgcls = msg->class;
1348                 parm->db.ipsrccls = srccls;
1349                 parm->db.ipmsgtag = msg->tag;
1350         }
1351         rc = iucv_call_b2f0(IUCV_SEND, parm);
1352         if (!rc)
1353                 msg->id = parm->db.ipmsgid;
1354 out:
1355         return rc;
1356 }
1357 EXPORT_SYMBOL(__iucv_message_send);
1358
1359 /**
1360  * iucv_message_send
1361  * @path: address of iucv path structure
1362  * @msg: address of iucv msg structure
1363  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1364  * @srccls: source class of message
1365  * @buffer: address of send buffer or address of struct iucv_array
1366  * @size: length of send buffer
1367  *
1368  * This function transmits data to another application. Data to be
1369  * transmitted is in a buffer and this is a one-way message and the
1370  * receiver will not reply to the message.
1371  *
1372  * Locking:     local_bh_enable/local_bh_disable
1373  *
1374  * Returns the result from the CP IUCV call.
1375  */
1376 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1377                       u8 flags, u32 srccls, void *buffer, size_t size)
1378 {
1379         int rc;
1380
1381         local_bh_disable();
1382         rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1383         local_bh_enable();
1384         return rc;
1385 }
1386 EXPORT_SYMBOL(iucv_message_send);
1387
1388 /**
1389  * iucv_message_send2way
1390  * @path: address of iucv path structure
1391  * @msg: address of iucv msg structure
1392  * @flags: how the message is sent and the reply is received
1393  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1394  * @srccls: source class of message
1395  * @buffer: address of send buffer or address of struct iucv_array
1396  * @size: length of send buffer
1397  * @ansbuf: address of answer buffer or address of struct iucv_array
1398  * @asize: size of reply buffer
1399  *
1400  * This function transmits data to another application. Data to be
1401  * transmitted is in a buffer. The receiver of the send is expected to
1402  * reply to the message and a buffer is provided into which IUCV moves
1403  * the reply to this message.
1404  *
1405  * Returns the result from the CP IUCV call.
1406  */
1407 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1408                           u8 flags, u32 srccls, void *buffer, size_t size,
1409                           void *answer, size_t asize, size_t *residual)
1410 {
1411         union iucv_param *parm;
1412         int rc;
1413
1414         local_bh_disable();
1415         if (cpumask_empty(&iucv_buffer_cpumask)) {
1416                 rc = -EIO;
1417                 goto out;
1418         }
1419         parm = iucv_param[smp_processor_id()];
1420         memset(parm, 0, sizeof(union iucv_param));
1421         if (flags & IUCV_IPRMDATA) {
1422                 parm->dpl.ippathid = path->pathid;
1423                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1424                 parm->dpl.iptrgcls = msg->class;
1425                 parm->dpl.ipsrccls = srccls;
1426                 parm->dpl.ipmsgtag = msg->tag;
1427                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1428                 parm->dpl.ipbfln2f = (u32) asize;
1429                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1430         } else {
1431                 parm->db.ippathid = path->pathid;
1432                 parm->db.ipflags1 = path->flags;        /* priority message */
1433                 parm->db.iptrgcls = msg->class;
1434                 parm->db.ipsrccls = srccls;
1435                 parm->db.ipmsgtag = msg->tag;
1436                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1437                 parm->db.ipbfln1f = (u32) size;
1438                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1439                 parm->db.ipbfln2f = (u32) asize;
1440         }
1441         rc = iucv_call_b2f0(IUCV_SEND, parm);
1442         if (!rc)
1443                 msg->id = parm->db.ipmsgid;
1444 out:
1445         local_bh_enable();
1446         return rc;
1447 }
1448 EXPORT_SYMBOL(iucv_message_send2way);
1449
1450 /**
1451  * iucv_path_pending
1452  * @data: Pointer to external interrupt buffer
1453  *
1454  * Process connection pending work item. Called from tasklet while holding
1455  * iucv_table_lock.
1456  */
1457 struct iucv_path_pending {
1458         u16 ippathid;
1459         u8  ipflags1;
1460         u8  iptype;
1461         u16 ipmsglim;
1462         u16 res1;
1463         u8  ipvmid[8];
1464         u8  ipuser[16];
1465         u32 res3;
1466         u8  ippollfg;
1467         u8  res4[3];
1468 } __packed;
1469
1470 static void iucv_path_pending(struct iucv_irq_data *data)
1471 {
1472         struct iucv_path_pending *ipp = (void *) data;
1473         struct iucv_handler *handler;
1474         struct iucv_path *path;
1475         char *error;
1476
1477         BUG_ON(iucv_path_table[ipp->ippathid]);
1478         /* New pathid, handler found. Create a new path struct. */
1479         error = iucv_error_no_memory;
1480         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1481         if (!path)
1482                 goto out_sever;
1483         path->pathid = ipp->ippathid;
1484         iucv_path_table[path->pathid] = path;
1485         EBCASC(ipp->ipvmid, 8);
1486
1487         /* Call registered handler until one is found that wants the path. */
1488         list_for_each_entry(handler, &iucv_handler_list, list) {
1489                 if (!handler->path_pending)
1490                         continue;
1491                 /*
1492                  * Add path to handler to allow a call to iucv_path_sever
1493                  * inside the path_pending function. If the handler returns
1494                  * an error remove the path from the handler again.
1495                  */
1496                 list_add(&path->list, &handler->paths);
1497                 path->handler = handler;
1498                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1499                         return;
1500                 list_del(&path->list);
1501                 path->handler = NULL;
1502         }
1503         /* No handler wanted the path. */
1504         iucv_path_table[path->pathid] = NULL;
1505         iucv_path_free(path);
1506         error = iucv_error_no_listener;
1507 out_sever:
1508         iucv_sever_pathid(ipp->ippathid, error);
1509 }
1510
1511 /**
1512  * iucv_path_complete
1513  * @data: Pointer to external interrupt buffer
1514  *
1515  * Process connection complete work item. Called from tasklet while holding
1516  * iucv_table_lock.
1517  */
1518 struct iucv_path_complete {
1519         u16 ippathid;
1520         u8  ipflags1;
1521         u8  iptype;
1522         u16 ipmsglim;
1523         u16 res1;
1524         u8  res2[8];
1525         u8  ipuser[16];
1526         u32 res3;
1527         u8  ippollfg;
1528         u8  res4[3];
1529 } __packed;
1530
1531 static void iucv_path_complete(struct iucv_irq_data *data)
1532 {
1533         struct iucv_path_complete *ipc = (void *) data;
1534         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1535
1536         if (path)
1537                 path->flags = ipc->ipflags1;
1538         if (path && path->handler && path->handler->path_complete)
1539                 path->handler->path_complete(path, ipc->ipuser);
1540 }
1541
1542 /**
1543  * iucv_path_severed
1544  * @data: Pointer to external interrupt buffer
1545  *
1546  * Process connection severed work item. Called from tasklet while holding
1547  * iucv_table_lock.
1548  */
1549 struct iucv_path_severed {
1550         u16 ippathid;
1551         u8  res1;
1552         u8  iptype;
1553         u32 res2;
1554         u8  res3[8];
1555         u8  ipuser[16];
1556         u32 res4;
1557         u8  ippollfg;
1558         u8  res5[3];
1559 } __packed;
1560
1561 static void iucv_path_severed(struct iucv_irq_data *data)
1562 {
1563         struct iucv_path_severed *ips = (void *) data;
1564         struct iucv_path *path = iucv_path_table[ips->ippathid];
1565
1566         if (!path || !path->handler)    /* Already severed */
1567                 return;
1568         if (path->handler->path_severed)
1569                 path->handler->path_severed(path, ips->ipuser);
1570         else {
1571                 iucv_sever_pathid(path->pathid, NULL);
1572                 iucv_path_table[path->pathid] = NULL;
1573                 list_del(&path->list);
1574                 iucv_path_free(path);
1575         }
1576 }
1577
1578 /**
1579  * iucv_path_quiesced
1580  * @data: Pointer to external interrupt buffer
1581  *
1582  * Process connection quiesced work item. Called from tasklet while holding
1583  * iucv_table_lock.
1584  */
1585 struct iucv_path_quiesced {
1586         u16 ippathid;
1587         u8  res1;
1588         u8  iptype;
1589         u32 res2;
1590         u8  res3[8];
1591         u8  ipuser[16];
1592         u32 res4;
1593         u8  ippollfg;
1594         u8  res5[3];
1595 } __packed;
1596
1597 static void iucv_path_quiesced(struct iucv_irq_data *data)
1598 {
1599         struct iucv_path_quiesced *ipq = (void *) data;
1600         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1601
1602         if (path && path->handler && path->handler->path_quiesced)
1603                 path->handler->path_quiesced(path, ipq->ipuser);
1604 }
1605
1606 /**
1607  * iucv_path_resumed
1608  * @data: Pointer to external interrupt buffer
1609  *
1610  * Process connection resumed work item. Called from tasklet while holding
1611  * iucv_table_lock.
1612  */
1613 struct iucv_path_resumed {
1614         u16 ippathid;
1615         u8  res1;
1616         u8  iptype;
1617         u32 res2;
1618         u8  res3[8];
1619         u8  ipuser[16];
1620         u32 res4;
1621         u8  ippollfg;
1622         u8  res5[3];
1623 } __packed;
1624
1625 static void iucv_path_resumed(struct iucv_irq_data *data)
1626 {
1627         struct iucv_path_resumed *ipr = (void *) data;
1628         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1629
1630         if (path && path->handler && path->handler->path_resumed)
1631                 path->handler->path_resumed(path, ipr->ipuser);
1632 }
1633
1634 /**
1635  * iucv_message_complete
1636  * @data: Pointer to external interrupt buffer
1637  *
1638  * Process message complete work item. Called from tasklet while holding
1639  * iucv_table_lock.
1640  */
1641 struct iucv_message_complete {
1642         u16 ippathid;
1643         u8  ipflags1;
1644         u8  iptype;
1645         u32 ipmsgid;
1646         u32 ipaudit;
1647         u8  iprmmsg[8];
1648         u32 ipsrccls;
1649         u32 ipmsgtag;
1650         u32 res;
1651         u32 ipbfln2f;
1652         u8  ippollfg;
1653         u8  res2[3];
1654 } __packed;
1655
1656 static void iucv_message_complete(struct iucv_irq_data *data)
1657 {
1658         struct iucv_message_complete *imc = (void *) data;
1659         struct iucv_path *path = iucv_path_table[imc->ippathid];
1660         struct iucv_message msg;
1661
1662         if (path && path->handler && path->handler->message_complete) {
1663                 msg.flags = imc->ipflags1;
1664                 msg.id = imc->ipmsgid;
1665                 msg.audit = imc->ipaudit;
1666                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1667                 msg.class = imc->ipsrccls;
1668                 msg.tag = imc->ipmsgtag;
1669                 msg.length = imc->ipbfln2f;
1670                 path->handler->message_complete(path, &msg);
1671         }
1672 }
1673
1674 /**
1675  * iucv_message_pending
1676  * @data: Pointer to external interrupt buffer
1677  *
1678  * Process message pending work item. Called from tasklet while holding
1679  * iucv_table_lock.
1680  */
1681 struct iucv_message_pending {
1682         u16 ippathid;
1683         u8  ipflags1;
1684         u8  iptype;
1685         u32 ipmsgid;
1686         u32 iptrgcls;
1687         union {
1688                 u32 iprmmsg1_u32;
1689                 u8  iprmmsg1[4];
1690         } ln1msg1;
1691         union {
1692                 u32 ipbfln1f;
1693                 u8  iprmmsg2[4];
1694         } ln1msg2;
1695         u32 res1[3];
1696         u32 ipbfln2f;
1697         u8  ippollfg;
1698         u8  res2[3];
1699 } __packed;
1700
1701 static void iucv_message_pending(struct iucv_irq_data *data)
1702 {
1703         struct iucv_message_pending *imp = (void *) data;
1704         struct iucv_path *path = iucv_path_table[imp->ippathid];
1705         struct iucv_message msg;
1706
1707         if (path && path->handler && path->handler->message_pending) {
1708                 msg.flags = imp->ipflags1;
1709                 msg.id = imp->ipmsgid;
1710                 msg.class = imp->iptrgcls;
1711                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1712                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1713                         msg.length = 8;
1714                 } else
1715                         msg.length = imp->ln1msg2.ipbfln1f;
1716                 msg.reply_size = imp->ipbfln2f;
1717                 path->handler->message_pending(path, &msg);
1718         }
1719 }
1720
1721 /**
1722  * iucv_tasklet_fn:
1723  *
1724  * This tasklet loops over the queue of irq buffers created by
1725  * iucv_external_interrupt, calls the appropriate action handler
1726  * and then frees the buffer.
1727  */
1728 static void iucv_tasklet_fn(unsigned long ignored)
1729 {
1730         typedef void iucv_irq_fn(struct iucv_irq_data *);
1731         static iucv_irq_fn *irq_fn[] = {
1732                 [0x02] = iucv_path_complete,
1733                 [0x03] = iucv_path_severed,
1734                 [0x04] = iucv_path_quiesced,
1735                 [0x05] = iucv_path_resumed,
1736                 [0x06] = iucv_message_complete,
1737                 [0x07] = iucv_message_complete,
1738                 [0x08] = iucv_message_pending,
1739                 [0x09] = iucv_message_pending,
1740         };
1741         LIST_HEAD(task_queue);
1742         struct iucv_irq_list *p, *n;
1743
1744         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1745         if (!spin_trylock(&iucv_table_lock)) {
1746                 tasklet_schedule(&iucv_tasklet);
1747                 return;
1748         }
1749         iucv_active_cpu = smp_processor_id();
1750
1751         spin_lock_irq(&iucv_queue_lock);
1752         list_splice_init(&iucv_task_queue, &task_queue);
1753         spin_unlock_irq(&iucv_queue_lock);
1754
1755         list_for_each_entry_safe(p, n, &task_queue, list) {
1756                 list_del_init(&p->list);
1757                 irq_fn[p->data.iptype](&p->data);
1758                 kfree(p);
1759         }
1760
1761         iucv_active_cpu = -1;
1762         spin_unlock(&iucv_table_lock);
1763 }
1764
1765 /**
1766  * iucv_work_fn:
1767  *
1768  * This work function loops over the queue of path pending irq blocks
1769  * created by iucv_external_interrupt, calls the appropriate action
1770  * handler and then frees the buffer.
1771  */
1772 static void iucv_work_fn(struct work_struct *work)
1773 {
1774         LIST_HEAD(work_queue);
1775         struct iucv_irq_list *p, *n;
1776
1777         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1778         spin_lock_bh(&iucv_table_lock);
1779         iucv_active_cpu = smp_processor_id();
1780
1781         spin_lock_irq(&iucv_queue_lock);
1782         list_splice_init(&iucv_work_queue, &work_queue);
1783         spin_unlock_irq(&iucv_queue_lock);
1784
1785         iucv_cleanup_queue();
1786         list_for_each_entry_safe(p, n, &work_queue, list) {
1787                 list_del_init(&p->list);
1788                 iucv_path_pending(&p->data);
1789                 kfree(p);
1790         }
1791
1792         iucv_active_cpu = -1;
1793         spin_unlock_bh(&iucv_table_lock);
1794 }
1795
1796 /**
1797  * iucv_external_interrupt
1798  * @code: irq code
1799  *
1800  * Handles external interrupts coming in from CP.
1801  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1802  */
1803 static void iucv_external_interrupt(struct ext_code ext_code,
1804                                     unsigned int param32, unsigned long param64)
1805 {
1806         struct iucv_irq_data *p;
1807         struct iucv_irq_list *work;
1808
1809         inc_irq_stat(IRQEXT_IUC);
1810         p = iucv_irq_data[smp_processor_id()];
1811         if (p->ippathid >= iucv_max_pathid) {
1812                 WARN_ON(p->ippathid >= iucv_max_pathid);
1813                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1814                 return;
1815         }
1816         BUG_ON(p->iptype  < 0x01 || p->iptype > 0x09);
1817         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1818         if (!work) {
1819                 pr_warning("iucv_external_interrupt: out of memory\n");
1820                 return;
1821         }
1822         memcpy(&work->data, p, sizeof(work->data));
1823         spin_lock(&iucv_queue_lock);
1824         if (p->iptype == 0x01) {
1825                 /* Path pending interrupt. */
1826                 list_add_tail(&work->list, &iucv_work_queue);
1827                 schedule_work(&iucv_work);
1828         } else {
1829                 /* The other interrupts. */
1830                 list_add_tail(&work->list, &iucv_task_queue);
1831                 tasklet_schedule(&iucv_tasklet);
1832         }
1833         spin_unlock(&iucv_queue_lock);
1834 }
1835
1836 static int iucv_pm_prepare(struct device *dev)
1837 {
1838         int rc = 0;
1839
1840 #ifdef CONFIG_PM_DEBUG
1841         printk(KERN_INFO "iucv_pm_prepare\n");
1842 #endif
1843         if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1844                 rc = dev->driver->pm->prepare(dev);
1845         return rc;
1846 }
1847
1848 static void iucv_pm_complete(struct device *dev)
1849 {
1850 #ifdef CONFIG_PM_DEBUG
1851         printk(KERN_INFO "iucv_pm_complete\n");
1852 #endif
1853         if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1854                 dev->driver->pm->complete(dev);
1855 }
1856
1857 /**
1858  * iucv_path_table_empty() - determine if iucv path table is empty
1859  *
1860  * Returns 0 if there are still iucv pathes defined
1861  *         1 if there are no iucv pathes defined
1862  */
1863 int iucv_path_table_empty(void)
1864 {
1865         int i;
1866
1867         for (i = 0; i < iucv_max_pathid; i++) {
1868                 if (iucv_path_table[i])
1869                         return 0;
1870         }
1871         return 1;
1872 }
1873
1874 /**
1875  * iucv_pm_freeze() - Freeze PM callback
1876  * @dev:        iucv-based device
1877  *
1878  * disable iucv interrupts
1879  * invoke callback function of the iucv-based driver
1880  * shut down iucv, if no iucv-pathes are established anymore
1881  */
1882 static int iucv_pm_freeze(struct device *dev)
1883 {
1884         int cpu;
1885         struct iucv_irq_list *p, *n;
1886         int rc = 0;
1887
1888 #ifdef CONFIG_PM_DEBUG
1889         printk(KERN_WARNING "iucv_pm_freeze\n");
1890 #endif
1891         if (iucv_pm_state != IUCV_PM_FREEZING) {
1892                 for_each_cpu(cpu, &iucv_irq_cpumask)
1893                         smp_call_function_single(cpu, iucv_block_cpu_almost,
1894                                                  NULL, 1);
1895                 cancel_work_sync(&iucv_work);
1896                 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1897                         list_del_init(&p->list);
1898                         iucv_sever_pathid(p->data.ippathid,
1899                                           iucv_error_no_listener);
1900                         kfree(p);
1901                 }
1902         }
1903         iucv_pm_state = IUCV_PM_FREEZING;
1904         if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1905                 rc = dev->driver->pm->freeze(dev);
1906         if (iucv_path_table_empty())
1907                 iucv_disable();
1908         return rc;
1909 }
1910
1911 /**
1912  * iucv_pm_thaw() - Thaw PM callback
1913  * @dev:        iucv-based device
1914  *
1915  * make iucv ready for use again: allocate path table, declare interrupt buffers
1916  *                                and enable iucv interrupts
1917  * invoke callback function of the iucv-based driver
1918  */
1919 static int iucv_pm_thaw(struct device *dev)
1920 {
1921         int rc = 0;
1922
1923 #ifdef CONFIG_PM_DEBUG
1924         printk(KERN_WARNING "iucv_pm_thaw\n");
1925 #endif
1926         iucv_pm_state = IUCV_PM_THAWING;
1927         if (!iucv_path_table) {
1928                 rc = iucv_enable();
1929                 if (rc)
1930                         goto out;
1931         }
1932         if (cpumask_empty(&iucv_irq_cpumask)) {
1933                 if (iucv_nonsmp_handler)
1934                         /* enable interrupts on one cpu */
1935                         iucv_allow_cpu(NULL);
1936                 else
1937                         /* enable interrupts on all cpus */
1938                         iucv_setmask_mp();
1939         }
1940         if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1941                 rc = dev->driver->pm->thaw(dev);
1942 out:
1943         return rc;
1944 }
1945
1946 /**
1947  * iucv_pm_restore() - Restore PM callback
1948  * @dev:        iucv-based device
1949  *
1950  * make iucv ready for use again: allocate path table, declare interrupt buffers
1951  *                                and enable iucv interrupts
1952  * invoke callback function of the iucv-based driver
1953  */
1954 static int iucv_pm_restore(struct device *dev)
1955 {
1956         int rc = 0;
1957
1958 #ifdef CONFIG_PM_DEBUG
1959         printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1960 #endif
1961         if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1962                 pr_warning("Suspending Linux did not completely close all IUCV "
1963                         "connections\n");
1964         iucv_pm_state = IUCV_PM_RESTORING;
1965         if (cpumask_empty(&iucv_irq_cpumask)) {
1966                 rc = iucv_query_maxconn();
1967                 rc = iucv_enable();
1968                 if (rc)
1969                         goto out;
1970         }
1971         if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1972                 rc = dev->driver->pm->restore(dev);
1973 out:
1974         return rc;
1975 }
1976
1977 struct iucv_interface iucv_if = {
1978         .message_receive = iucv_message_receive,
1979         .__message_receive = __iucv_message_receive,
1980         .message_reply = iucv_message_reply,
1981         .message_reject = iucv_message_reject,
1982         .message_send = iucv_message_send,
1983         .__message_send = __iucv_message_send,
1984         .message_send2way = iucv_message_send2way,
1985         .message_purge = iucv_message_purge,
1986         .path_accept = iucv_path_accept,
1987         .path_connect = iucv_path_connect,
1988         .path_quiesce = iucv_path_quiesce,
1989         .path_resume = iucv_path_resume,
1990         .path_sever = iucv_path_sever,
1991         .iucv_register = iucv_register,
1992         .iucv_unregister = iucv_unregister,
1993         .bus = NULL,
1994         .root = NULL,
1995 };
1996 EXPORT_SYMBOL(iucv_if);
1997
1998 /**
1999  * iucv_init
2000  *
2001  * Allocates and initializes various data structures.
2002  */
2003 static int __init iucv_init(void)
2004 {
2005         int rc;
2006         int cpu;
2007
2008         if (!MACHINE_IS_VM) {
2009                 rc = -EPROTONOSUPPORT;
2010                 goto out;
2011         }
2012         ctl_set_bit(0, 1);
2013         rc = iucv_query_maxconn();
2014         if (rc)
2015                 goto out_ctl;
2016         rc = register_external_interrupt(0x4000, iucv_external_interrupt);
2017         if (rc)
2018                 goto out_ctl;
2019         iucv_root = root_device_register("iucv");
2020         if (IS_ERR(iucv_root)) {
2021                 rc = PTR_ERR(iucv_root);
2022                 goto out_int;
2023         }
2024
2025         for_each_online_cpu(cpu) {
2026                 /* Note: GFP_DMA used to get memory below 2G */
2027                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
2028                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2029                 if (!iucv_irq_data[cpu]) {
2030                         rc = -ENOMEM;
2031                         goto out_free;
2032                 }
2033
2034                 /* Allocate parameter blocks. */
2035                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
2036                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2037                 if (!iucv_param[cpu]) {
2038                         rc = -ENOMEM;
2039                         goto out_free;
2040                 }
2041                 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
2042                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2043                 if (!iucv_param_irq[cpu]) {
2044                         rc = -ENOMEM;
2045                         goto out_free;
2046                 }
2047
2048         }
2049         rc = register_hotcpu_notifier(&iucv_cpu_notifier);
2050         if (rc)
2051                 goto out_free;
2052         rc = register_reboot_notifier(&iucv_reboot_notifier);
2053         if (rc)
2054                 goto out_cpu;
2055         ASCEBC(iucv_error_no_listener, 16);
2056         ASCEBC(iucv_error_no_memory, 16);
2057         ASCEBC(iucv_error_pathid, 16);
2058         iucv_available = 1;
2059         rc = bus_register(&iucv_bus);
2060         if (rc)
2061                 goto out_reboot;
2062         iucv_if.root = iucv_root;
2063         iucv_if.bus = &iucv_bus;
2064         return 0;
2065
2066 out_reboot:
2067         unregister_reboot_notifier(&iucv_reboot_notifier);
2068 out_cpu:
2069         unregister_hotcpu_notifier(&iucv_cpu_notifier);
2070 out_free:
2071         for_each_possible_cpu(cpu) {
2072                 kfree(iucv_param_irq[cpu]);
2073                 iucv_param_irq[cpu] = NULL;
2074                 kfree(iucv_param[cpu]);
2075                 iucv_param[cpu] = NULL;
2076                 kfree(iucv_irq_data[cpu]);
2077                 iucv_irq_data[cpu] = NULL;
2078         }
2079         root_device_unregister(iucv_root);
2080 out_int:
2081         unregister_external_interrupt(0x4000, iucv_external_interrupt);
2082 out_ctl:
2083         ctl_clear_bit(0, 1);
2084 out:
2085         return rc;
2086 }
2087
2088 /**
2089  * iucv_exit
2090  *
2091  * Frees everything allocated from iucv_init.
2092  */
2093 static void __exit iucv_exit(void)
2094 {
2095         struct iucv_irq_list *p, *n;
2096         int cpu;
2097
2098         spin_lock_irq(&iucv_queue_lock);
2099         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2100                 kfree(p);
2101         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2102                 kfree(p);
2103         spin_unlock_irq(&iucv_queue_lock);
2104         unregister_reboot_notifier(&iucv_reboot_notifier);
2105         unregister_hotcpu_notifier(&iucv_cpu_notifier);
2106         for_each_possible_cpu(cpu) {
2107                 kfree(iucv_param_irq[cpu]);
2108                 iucv_param_irq[cpu] = NULL;
2109                 kfree(iucv_param[cpu]);
2110                 iucv_param[cpu] = NULL;
2111                 kfree(iucv_irq_data[cpu]);
2112                 iucv_irq_data[cpu] = NULL;
2113         }
2114         root_device_unregister(iucv_root);
2115         bus_unregister(&iucv_bus);
2116         unregister_external_interrupt(0x4000, iucv_external_interrupt);
2117 }
2118
2119 subsys_initcall(iucv_init);
2120 module_exit(iucv_exit);
2121
2122 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2123 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2124 MODULE_LICENSE("GPL");