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 ([email protected])  Sept. 2000
   9  *      Xenia Tkatschow ([email protected])
  10  *    2Gb awareness and general cleanup:
  11  *      Fritz Elfert ([email protected], [email protected])
  12  *    Rewritten for af_iucv:
  13  *      Martin Schwidefsky <[email protected]>
  14  *    PM functions:
  15  *      Ursula Braun ([email protected])
  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 <asm/atomic.h>
  55 #include <asm/ebcdic.h>
  56 #include <asm/io.h>
  57 #include <asm/s390_ext.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_MASK_NONE;
 132 static cpumask_t iucv_irq_cpumask = CPU_MASK_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         cpu_set(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         cpu_clear(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         cpu_clear(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 (cpu_isset(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         cpu_set(cpu, iucv_buffer_cpumask);
 503
 504         if (iucv_nonsmp_handler == 0 || cpus_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 (!cpu_isset(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         cpu_clear(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 (cpu_isset(cpu, iucv_buffer_cpumask) &&
 550                     !cpu_isset(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 = iucv_irq_cpumask;
 568         cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
 569         for_each_cpu_mask_nr(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 (cpus_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 = iucv_buffer_cpumask;
 679                 cpu_clear(cpu, cpumask);
 680                 if (cpus_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 (cpus_empty(iucv_irq_cpumask))
 685                         smp_call_function_single(first_cpu(iucv_buffer_cpumask),
 686                                                  iucv_allow_cpu, NULL, 1);
 687                 break;
 688         }
 689         return NOTIFY_OK;
 690 }
 691
 692 static struct notifier_block __refdata iucv_cpu_notifier = {
 693         .notifier_call = iucv_cpu_notify,
 694 };
 695
 696 /**
 697  * iucv_sever_pathid
 698  * @pathid: path identification number.
 699  * @userdata: 16-bytes of user data.
 700  *
 701  * Sever an iucv path to free up the pathid. Used internally.
 702  */
 703 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
 704 {
 705         union iucv_param *parm;
 706
 707         parm = iucv_param_irq[smp_processor_id()];
 708         memset(parm, 0, sizeof(union iucv_param));
 709         if (userdata)
 710                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 711         parm->ctrl.ippathid = pathid;
 712         return iucv_call_b2f0(IUCV_SEVER, parm);
 713 }
 714
 715 /**
 716  * __iucv_cleanup_queue
 717  * @dummy: unused dummy argument
 718  *
 719  * Nop function called via smp_call_function to force work items from
 720  * pending external iucv interrupts to the work queue.
 721  */
 722 static void __iucv_cleanup_queue(void *dummy)
 723 {
 724 }
 725
 726 /**
 727  * iucv_cleanup_queue
 728  *
 729  * Function called after a path has been severed to find all remaining
 730  * work items for the now stale pathid. The caller needs to hold the
 731  * iucv_table_lock.
 732  */
 733 static void iucv_cleanup_queue(void)
 734 {
 735         struct iucv_irq_list *p, *n;
 736
 737         /*
 738          * When a path is severed, the pathid can be reused immediately
 739          * on a iucv connect or a connection pending interrupt. Remove
 740          * all entries from the task queue that refer to a stale pathid
 741          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
 742          * or deliver the connection pending interrupt. To get all the
 743          * pending interrupts force them to the work queue by calling
 744          * an empty function on all cpus.
 745          */
 746         smp_call_function(__iucv_cleanup_queue, NULL, 1);
 747         spin_lock_irq(&iucv_queue_lock);
 748         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
 749                 /* Remove stale work items from the task queue. */
 750                 if (iucv_path_table[p->data.ippathid] == NULL) {
 751                         list_del(&p->list);
 752                         kfree(p);
 753                 }
 754         }
 755         spin_unlock_irq(&iucv_queue_lock);
 756 }
 757
 758 /**
 759  * iucv_register:
 760  * @handler: address of iucv handler structure
 761  * @smp: != 0 indicates that the handler can deal with out of order messages
 762  *
 763  * Registers a driver with IUCV.
 764  *
 765  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 766  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 767  */
 768 int iucv_register(struct iucv_handler *handler, int smp)
 769 {
 770         int rc;
 771
 772         if (!iucv_available)
 773                 return -ENOSYS;
 774         mutex_lock(&iucv_register_mutex);
 775         if (!smp)
 776                 iucv_nonsmp_handler++;
 777         if (list_empty(&iucv_handler_list)) {
 778                 rc = iucv_enable();
 779                 if (rc)
 780                         goto out_mutex;
 781         } else if (!smp && iucv_nonsmp_handler == 1)
 782                 iucv_setmask_up();
 783         INIT_LIST_HEAD(&handler->paths);
 784
 785         spin_lock_bh(&iucv_table_lock);
 786         list_add_tail(&handler->list, &iucv_handler_list);
 787         spin_unlock_bh(&iucv_table_lock);
 788         rc = 0;
 789 out_mutex:
 790         mutex_unlock(&iucv_register_mutex);
 791         return rc;
 792 }
 793 EXPORT_SYMBOL(iucv_register);
 794
 795 /**
 796  * iucv_unregister
 797  * @handler:  address of iucv handler structure
 798  * @smp: != 0 indicates that the handler can deal with out of order messages
 799  *
 800  * Unregister driver from IUCV.
 801  */
 802 void iucv_unregister(struct iucv_handler *handler, int smp)
 803 {
 804         struct iucv_path *p, *n;
 805
 806         mutex_lock(&iucv_register_mutex);
 807         spin_lock_bh(&iucv_table_lock);
 808         /* Remove handler from the iucv_handler_list. */
 809         list_del_init(&handler->list);
 810         /* Sever all pathids still referring to the handler. */
 811         list_for_each_entry_safe(p, n, &handler->paths, list) {
 812                 iucv_sever_pathid(p->pathid, NULL);
 813                 iucv_path_table[p->pathid] = NULL;
 814                 list_del(&p->list);
 815                 iucv_path_free(p);
 816         }
 817         spin_unlock_bh(&iucv_table_lock);
 818         if (!smp)
 819                 iucv_nonsmp_handler--;
 820         if (list_empty(&iucv_handler_list))
 821                 iucv_disable();
 822         else if (!smp && iucv_nonsmp_handler == 0)
 823                 iucv_setmask_mp();
 824         mutex_unlock(&iucv_register_mutex);
 825 }
 826 EXPORT_SYMBOL(iucv_unregister);
 827
 828 static int iucv_reboot_event(struct notifier_block *this,
 829                              unsigned long event, void *ptr)
 830 {
 831         int i, rc;
 832
 833         get_online_cpus();
 834         on_each_cpu(iucv_block_cpu, NULL, 1);
 835         preempt_disable();
 836         for (i = 0; i < iucv_max_pathid; i++) {
 837                 if (iucv_path_table[i])
 838                         rc = iucv_sever_pathid(i, NULL);
 839         }
 840         preempt_enable();
 841         put_online_cpus();
 842         iucv_disable();
 843         return NOTIFY_DONE;
 844 }
 845
 846 static struct notifier_block iucv_reboot_notifier = {
 847         .notifier_call = iucv_reboot_event,
 848 };
 849
 850 /**
 851  * iucv_path_accept
 852  * @path: address of iucv path structure
 853  * @handler: address of iucv handler structure
 854  * @userdata: 16 bytes of data reflected to the communication partner
 855  * @private: private data passed to interrupt handlers for this path
 856  *
 857  * This function is issued after the user received a connection pending
 858  * external interrupt and now wishes to complete the IUCV communication path.
 859  *
 860  * Returns the result of the CP IUCV call.
 861  */
 862 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 863                      u8 userdata[16], void *private)
 864 {
 865         union iucv_param *parm;
 866         int rc;
 867
 868         local_bh_disable();
 869         if (cpus_empty(iucv_buffer_cpumask)) {
 870                 rc = -EIO;
 871                 goto out;
 872         }
 873         /* Prepare parameter block. */
 874         parm = iucv_param[smp_processor_id()];
 875         memset(parm, 0, sizeof(union iucv_param));
 876         parm->ctrl.ippathid = path->pathid;
 877         parm->ctrl.ipmsglim = path->msglim;
 878         if (userdata)
 879                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 880         parm->ctrl.ipflags1 = path->flags;
 881
 882         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
 883         if (!rc) {
 884                 path->private = private;
 885                 path->msglim = parm->ctrl.ipmsglim;
 886                 path->flags = parm->ctrl.ipflags1;
 887         }
 888 out:
 889         local_bh_enable();
 890         return rc;
 891 }
 892 EXPORT_SYMBOL(iucv_path_accept);
 893
 894 /**
 895  * iucv_path_connect
 896  * @path: address of iucv path structure
 897  * @handler: address of iucv handler structure
 898  * @userid: 8-byte user identification
 899  * @system: 8-byte target system identification
 900  * @userdata: 16 bytes of data reflected to the communication partner
 901  * @private: private data passed to interrupt handlers for this path
 902  *
 903  * This function establishes an IUCV path. Although the connect may complete
 904  * successfully, you are not able to use the path until you receive an IUCV
 905  * Connection Complete external interrupt.
 906  *
 907  * Returns the result of the CP IUCV call.
 908  */
 909 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 910                       u8 userid[8], u8 system[8], u8 userdata[16],
 911                       void *private)
 912 {
 913         union iucv_param *parm;
 914         int rc;
 915
 916         spin_lock_bh(&iucv_table_lock);
 917         iucv_cleanup_queue();
 918         if (cpus_empty(iucv_buffer_cpumask)) {
 919                 rc = -EIO;
 920                 goto out;
 921         }
 922         parm = iucv_param[smp_processor_id()];
 923         memset(parm, 0, sizeof(union iucv_param));
 924         parm->ctrl.ipmsglim = path->msglim;
 925         parm->ctrl.ipflags1 = path->flags;
 926         if (userid) {
 927                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
 928                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 929                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 930         }
 931         if (system) {
 932                 memcpy(parm->ctrl.iptarget, system,
 933                        sizeof(parm->ctrl.iptarget));
 934                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 935                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 936         }
 937         if (userdata)
 938                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 939
 940         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
 941         if (!rc) {
 942                 if (parm->ctrl.ippathid < iucv_max_pathid) {
 943                         path->pathid = parm->ctrl.ippathid;
 944                         path->msglim = parm->ctrl.ipmsglim;
 945                         path->flags = parm->ctrl.ipflags1;
 946                         path->handler = handler;
 947                         path->private = private;
 948                         list_add_tail(&path->list, &handler->paths);
 949                         iucv_path_table[path->pathid] = path;
 950                 } else {
 951                         iucv_sever_pathid(parm->ctrl.ippathid,
 952                                           iucv_error_pathid);
 953                         rc = -EIO;
 954                 }
 955         }
 956 out:
 957         spin_unlock_bh(&iucv_table_lock);
 958         return rc;
 959 }
 960 EXPORT_SYMBOL(iucv_path_connect);
 961
 962 /**
 963  * iucv_path_quiesce:
 964  * @path: address of iucv path structure
 965  * @userdata: 16 bytes of data reflected to the communication partner
 966  *
 967  * This function temporarily suspends incoming messages on an IUCV path.
 968  * You can later reactivate the path by invoking the iucv_resume function.
 969  *
 970  * Returns the result from the CP IUCV call.
 971  */
 972 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
 973 {
 974         union iucv_param *parm;
 975         int rc;
 976
 977         local_bh_disable();
 978         if (cpus_empty(iucv_buffer_cpumask)) {
 979                 rc = -EIO;
 980                 goto out;
 981         }
 982         parm = iucv_param[smp_processor_id()];
 983         memset(parm, 0, sizeof(union iucv_param));
 984         if (userdata)
 985                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 986         parm->ctrl.ippathid = path->pathid;
 987         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
 988 out:
 989         local_bh_enable();
 990         return rc;
 991 }
 992 EXPORT_SYMBOL(iucv_path_quiesce);
 993
 994 /**
 995  * iucv_path_resume:
 996  * @path: address of iucv path structure
 997  * @userdata: 16 bytes of data reflected to the communication partner
 998  *
 999  * This function resumes incoming messages on an IUCV path that has
1000  * been stopped with iucv_path_quiesce.
1001  *
1002  * Returns the result from the CP IUCV call.
1003  */
1004 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1005 {
1006         union iucv_param *parm;
1007         int rc;
1008
1009         local_bh_disable();
1010         if (cpus_empty(iucv_buffer_cpumask)) {
1011                 rc = -EIO;
1012                 goto out;
1013         }
1014         parm = iucv_param[smp_processor_id()];
1015         memset(parm, 0, sizeof(union iucv_param));
1016         if (userdata)
1017                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1018         parm->ctrl.ippathid = path->pathid;
1019         rc = iucv_call_b2f0(IUCV_RESUME, parm);
1020 out:
1021         local_bh_enable();
1022         return rc;
1023 }
1024
1025 /**
1026  * iucv_path_sever
1027  * @path: address of iucv path structure
1028  * @userdata: 16 bytes of data reflected to the communication partner
1029  *
1030  * This function terminates an IUCV path.
1031  *
1032  * Returns the result from the CP IUCV call.
1033  */
1034 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1035 {
1036         int rc;
1037
1038         preempt_disable();
1039         if (cpus_empty(iucv_buffer_cpumask)) {
1040                 rc = -EIO;
1041                 goto out;
1042         }
1043         if (iucv_active_cpu != smp_processor_id())
1044                 spin_lock_bh(&iucv_table_lock);
1045         rc = iucv_sever_pathid(path->pathid, userdata);
1046         iucv_path_table[path->pathid] = NULL;
1047         list_del_init(&path->list);
1048         if (iucv_active_cpu != smp_processor_id())
1049                 spin_unlock_bh(&iucv_table_lock);
1050 out:
1051         preempt_enable();
1052         return rc;
1053 }
1054 EXPORT_SYMBOL(iucv_path_sever);
1055
1056 /**
1057  * iucv_message_purge
1058  * @path: address of iucv path structure
1059  * @msg: address of iucv msg structure
1060  * @srccls: source class of message
1061  *
1062  * Cancels a message you have sent.
1063  *
1064  * Returns the result from the CP IUCV call.
1065  */
1066 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1067                        u32 srccls)
1068 {
1069         union iucv_param *parm;
1070         int rc;
1071
1072         local_bh_disable();
1073         if (cpus_empty(iucv_buffer_cpumask)) {
1074                 rc = -EIO;
1075                 goto out;
1076         }
1077         parm = iucv_param[smp_processor_id()];
1078         memset(parm, 0, sizeof(union iucv_param));
1079         parm->purge.ippathid = path->pathid;
1080         parm->purge.ipmsgid = msg->id;
1081         parm->purge.ipsrccls = srccls;
1082         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1083         rc = iucv_call_b2f0(IUCV_PURGE, parm);
1084         if (!rc) {
1085                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1086                 msg->tag = parm->purge.ipmsgtag;
1087         }
1088 out:
1089         local_bh_enable();
1090         return rc;
1091 }
1092 EXPORT_SYMBOL(iucv_message_purge);
1093
1094 /**
1095  * iucv_message_receive_iprmdata
1096  * @path: address of iucv path structure
1097  * @msg: address of iucv msg structure
1098  * @flags: how the message is received (IUCV_IPBUFLST)
1099  * @buffer: address of data buffer or address of struct iucv_array
1100  * @size: length of data buffer
1101  * @residual:
1102  *
1103  * Internal function used by iucv_message_receive and __iucv_message_receive
1104  * to receive RMDATA data stored in struct iucv_message.
1105  */
1106 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1107                                          struct iucv_message *msg,
1108                                          u8 flags, void *buffer,
1109                                          size_t size, size_t *residual)
1110 {
1111         struct iucv_array *array;
1112         u8 *rmmsg;
1113         size_t copy;
1114
1115         /*
1116          * Message is 8 bytes long and has been stored to the
1117          * message descriptor itself.
1118          */
1119         if (residual)
1120                 *residual = abs(size - 8);
1121         rmmsg = msg->rmmsg;
1122         if (flags & IUCV_IPBUFLST) {
1123                 /* Copy to struct iucv_array. */
1124                 size = (size < 8) ? size : 8;
1125                 for (array = buffer; size > 0; array++) {
1126                         copy = min_t(size_t, size, array->length);
1127                         memcpy((u8 *)(addr_t) array->address,
1128                                 rmmsg, copy);
1129                         rmmsg += copy;
1130                         size -= copy;
1131                 }
1132         } else {
1133                 /* Copy to direct buffer. */
1134                 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1135         }
1136         return 0;
1137 }
1138
1139 /**
1140  * __iucv_message_receive
1141  * @path: address of iucv path structure
1142  * @msg: address of iucv msg structure
1143  * @flags: how the message is received (IUCV_IPBUFLST)
1144  * @buffer: address of data buffer or address of struct iucv_array
1145  * @size: length of data buffer
1146  * @residual:
1147  *
1148  * This function receives messages that are being sent to you over
1149  * established paths. This function will deal with RMDATA messages
1150  * embedded in struct iucv_message as well.
1151  *
1152  * Locking:     no locking
1153  *
1154  * Returns the result from the CP IUCV call.
1155  */
1156 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1157                            u8 flags, void *buffer, size_t size, size_t *residual)
1158 {
1159         union iucv_param *parm;
1160         int rc;
1161
1162         if (msg->flags & IUCV_IPRMDATA)
1163                 return iucv_message_receive_iprmdata(path, msg, flags,
1164                                                      buffer, size, residual);
1165         if (cpus_empty(iucv_buffer_cpumask)) {
1166                 rc = -EIO;
1167                 goto out;
1168         }
1169         parm = iucv_param[smp_processor_id()];
1170         memset(parm, 0, sizeof(union iucv_param));
1171         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1172         parm->db.ipbfln1f = (u32) size;
1173         parm->db.ipmsgid = msg->id;
1174         parm->db.ippathid = path->pathid;
1175         parm->db.iptrgcls = msg->class;
1176         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1177                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1178         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1179         if (!rc || rc == 5) {
1180                 msg->flags = parm->db.ipflags1;
1181                 if (residual)
1182                         *residual = parm->db.ipbfln1f;
1183         }
1184 out:
1185         return rc;
1186 }
1187 EXPORT_SYMBOL(__iucv_message_receive);
1188
1189 /**
1190  * iucv_message_receive
1191  * @path: address of iucv path structure
1192  * @msg: address of iucv msg structure
1193  * @flags: how the message is received (IUCV_IPBUFLST)
1194  * @buffer: address of data buffer or address of struct iucv_array
1195  * @size: length of data buffer
1196  * @residual:
1197  *
1198  * This function receives messages that are being sent to you over
1199  * established paths. This function will deal with RMDATA messages
1200  * embedded in struct iucv_message as well.
1201  *
1202  * Locking:     local_bh_enable/local_bh_disable
1203  *
1204  * Returns the result from the CP IUCV call.
1205  */
1206 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1207                          u8 flags, void *buffer, size_t size, size_t *residual)
1208 {
1209         int rc;
1210
1211         if (msg->flags & IUCV_IPRMDATA)
1212                 return iucv_message_receive_iprmdata(path, msg, flags,
1213                                                      buffer, size, residual);
1214         local_bh_disable();
1215         rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1216         local_bh_enable();
1217         return rc;
1218 }
1219 EXPORT_SYMBOL(iucv_message_receive);
1220
1221 /**
1222  * iucv_message_reject
1223  * @path: address of iucv path structure
1224  * @msg: address of iucv msg structure
1225  *
1226  * The reject function refuses a specified message. Between the time you
1227  * are notified of a message and the time that you complete the message,
1228  * the message may be rejected.
1229  *
1230  * Returns the result from the CP IUCV call.
1231  */
1232 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1233 {
1234         union iucv_param *parm;
1235         int rc;
1236
1237         local_bh_disable();
1238         if (cpus_empty(iucv_buffer_cpumask)) {
1239                 rc = -EIO;
1240                 goto out;
1241         }
1242         parm = iucv_param[smp_processor_id()];
1243         memset(parm, 0, sizeof(union iucv_param));
1244         parm->db.ippathid = path->pathid;
1245         parm->db.ipmsgid = msg->id;
1246         parm->db.iptrgcls = msg->class;
1247         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1248         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1249 out:
1250         local_bh_enable();
1251         return rc;
1252 }
1253 EXPORT_SYMBOL(iucv_message_reject);
1254
1255 /**
1256  * iucv_message_reply
1257  * @path: address of iucv path structure
1258  * @msg: address of iucv msg structure
1259  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1260  * @reply: address of reply data buffer or address of struct iucv_array
1261  * @size: length of reply data buffer
1262  *
1263  * This function responds to the two-way messages that you receive. You
1264  * must identify completely the message to which you wish to reply. ie,
1265  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1266  * the parameter list.
1267  *
1268  * Returns the result from the CP IUCV call.
1269  */
1270 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1271                        u8 flags, void *reply, size_t size)
1272 {
1273         union iucv_param *parm;
1274         int rc;
1275
1276         local_bh_disable();
1277         if (cpus_empty(iucv_buffer_cpumask)) {
1278                 rc = -EIO;
1279                 goto out;
1280         }
1281         parm = iucv_param[smp_processor_id()];
1282         memset(parm, 0, sizeof(union iucv_param));
1283         if (flags & IUCV_IPRMDATA) {
1284                 parm->dpl.ippathid = path->pathid;
1285                 parm->dpl.ipflags1 = flags;
1286                 parm->dpl.ipmsgid = msg->id;
1287                 parm->dpl.iptrgcls = msg->class;
1288                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1289         } else {
1290                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1291                 parm->db.ipbfln1f = (u32) size;
1292                 parm->db.ippathid = path->pathid;
1293                 parm->db.ipflags1 = flags;
1294                 parm->db.ipmsgid = msg->id;
1295                 parm->db.iptrgcls = msg->class;
1296         }
1297         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1298 out:
1299         local_bh_enable();
1300         return rc;
1301 }
1302 EXPORT_SYMBOL(iucv_message_reply);
1303
1304 /**
1305  * __iucv_message_send
1306  * @path: address of iucv path structure
1307  * @msg: address of iucv msg structure
1308  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1309  * @srccls: source class of message
1310  * @buffer: address of send buffer or address of struct iucv_array
1311  * @size: length of send buffer
1312  *
1313  * This function transmits data to another application. Data to be
1314  * transmitted is in a buffer and this is a one-way message and the
1315  * receiver will not reply to the message.
1316  *
1317  * Locking:     no locking
1318  *
1319  * Returns the result from the CP IUCV call.
1320  */
1321 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1322                       u8 flags, u32 srccls, void *buffer, size_t size)
1323 {
1324         union iucv_param *parm;
1325         int rc;
1326
1327         if (cpus_empty(iucv_buffer_cpumask)) {
1328                 rc = -EIO;
1329                 goto out;
1330         }
1331         parm = iucv_param[smp_processor_id()];
1332         memset(parm, 0, sizeof(union iucv_param));
1333         if (flags & IUCV_IPRMDATA) {
1334                 /* Message of 8 bytes can be placed into the parameter list. */
1335                 parm->dpl.ippathid = path->pathid;
1336                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1337                 parm->dpl.iptrgcls = msg->class;
1338                 parm->dpl.ipsrccls = srccls;
1339                 parm->dpl.ipmsgtag = msg->tag;
1340                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1341         } else {
1342                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1343                 parm->db.ipbfln1f = (u32) size;
1344                 parm->db.ippathid = path->pathid;
1345                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1346                 parm->db.iptrgcls = msg->class;
1347                 parm->db.ipsrccls = srccls;
1348                 parm->db.ipmsgtag = msg->tag;
1349         }
1350         rc = iucv_call_b2f0(IUCV_SEND, parm);
1351         if (!rc)
1352                 msg->id = parm->db.ipmsgid;
1353 out:
1354         return rc;
1355 }
1356 EXPORT_SYMBOL(__iucv_message_send);
1357
1358 /**
1359  * iucv_message_send
1360  * @path: address of iucv path structure
1361  * @msg: address of iucv msg structure
1362  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1363  * @srccls: source class of message
1364  * @buffer: address of send buffer or address of struct iucv_array
1365  * @size: length of send buffer
1366  *
1367  * This function transmits data to another application. Data to be
1368  * transmitted is in a buffer and this is a one-way message and the
1369  * receiver will not reply to the message.
1370  *
1371  * Locking:     local_bh_enable/local_bh_disable
1372  *
1373  * Returns the result from the CP IUCV call.
1374  */
1375 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1376                       u8 flags, u32 srccls, void *buffer, size_t size)
1377 {
1378         int rc;
1379
1380         local_bh_disable();
1381         rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1382         local_bh_enable();
1383         return rc;
1384 }
1385 EXPORT_SYMBOL(iucv_message_send);
1386
1387 /**
1388  * iucv_message_send2way
1389  * @path: address of iucv path structure
1390  * @msg: address of iucv msg structure
1391  * @flags: how the message is sent and the reply is received
1392  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1393  * @srccls: source class of message
1394  * @buffer: address of send buffer or address of struct iucv_array
1395  * @size: length of send buffer
1396  * @ansbuf: address of answer buffer or address of struct iucv_array
1397  * @asize: size of reply buffer
1398  *
1399  * This function transmits data to another application. Data to be
1400  * transmitted is in a buffer. The receiver of the send is expected to
1401  * reply to the message and a buffer is provided into which IUCV moves
1402  * the reply to this message.
1403  *
1404  * Returns the result from the CP IUCV call.
1405  */
1406 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1407                           u8 flags, u32 srccls, void *buffer, size_t size,
1408                           void *answer, size_t asize, size_t *residual)
1409 {
1410         union iucv_param *parm;
1411         int rc;
1412
1413         local_bh_disable();
1414         if (cpus_empty(iucv_buffer_cpumask)) {
1415                 rc = -EIO;
1416                 goto out;
1417         }
1418         parm = iucv_param[smp_processor_id()];
1419         memset(parm, 0, sizeof(union iucv_param));
1420         if (flags & IUCV_IPRMDATA) {
1421                 parm->dpl.ippathid = path->pathid;
1422                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1423                 parm->dpl.iptrgcls = msg->class;
1424                 parm->dpl.ipsrccls = srccls;
1425                 parm->dpl.ipmsgtag = msg->tag;
1426                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1427                 parm->dpl.ipbfln2f = (u32) asize;
1428                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1429         } else {
1430                 parm->db.ippathid = path->pathid;
1431                 parm->db.ipflags1 = path->flags;        /* priority message */
1432                 parm->db.iptrgcls = msg->class;
1433                 parm->db.ipsrccls = srccls;
1434                 parm->db.ipmsgtag = msg->tag;
1435                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1436                 parm->db.ipbfln1f = (u32) size;
1437                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1438                 parm->db.ipbfln2f = (u32) asize;
1439         }
1440         rc = iucv_call_b2f0(IUCV_SEND, parm);
1441         if (!rc)
1442                 msg->id = parm->db.ipmsgid;
1443 out:
1444         local_bh_enable();
1445         return rc;
1446 }
1447 EXPORT_SYMBOL(iucv_message_send2way);
1448
1449 /**
1450  * iucv_path_pending
1451  * @data: Pointer to external interrupt buffer
1452  *
1453  * Process connection pending work item. Called from tasklet while holding
1454  * iucv_table_lock.
1455  */
1456 struct iucv_path_pending {
1457         u16 ippathid;
1458         u8  ipflags1;
1459         u8  iptype;
1460         u16 ipmsglim;
1461         u16 res1;
1462         u8  ipvmid[8];
1463         u8  ipuser[16];
1464         u32 res3;
1465         u8  ippollfg;
1466         u8  res4[3];
1467 } __packed;
1468
1469 static void iucv_path_pending(struct iucv_irq_data *data)
1470 {
1471         struct iucv_path_pending *ipp = (void *) data;
1472         struct iucv_handler *handler;
1473         struct iucv_path *path;
1474         char *error;
1475
1476         BUG_ON(iucv_path_table[ipp->ippathid]);
1477         /* New pathid, handler found. Create a new path struct. */
1478         error = iucv_error_no_memory;
1479         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1480         if (!path)
1481                 goto out_sever;
1482         path->pathid = ipp->ippathid;
1483         iucv_path_table[path->pathid] = path;
1484         EBCASC(ipp->ipvmid, 8);
1485
1486         /* Call registered handler until one is found that wants the path. */
1487         list_for_each_entry(handler, &iucv_handler_list, list) {
1488                 if (!handler->path_pending)
1489                         continue;
1490                 /*
1491                  * Add path to handler to allow a call to iucv_path_sever
1492                  * inside the path_pending function. If the handler returns
1493                  * an error remove the path from the handler again.
1494                  */
1495                 list_add(&path->list, &handler->paths);
1496                 path->handler = handler;
1497                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1498                         return;
1499                 list_del(&path->list);
1500                 path->handler = NULL;
1501         }
1502         /* No handler wanted the path. */
1503         iucv_path_table[path->pathid] = NULL;
1504         iucv_path_free(path);
1505         error = iucv_error_no_listener;
1506 out_sever:
1507         iucv_sever_pathid(ipp->ippathid, error);
1508 }
1509
1510 /**
1511  * iucv_path_complete
1512  * @data: Pointer to external interrupt buffer
1513  *
1514  * Process connection complete work item. Called from tasklet while holding
1515  * iucv_table_lock.
1516  */
1517 struct iucv_path_complete {
1518         u16 ippathid;
1519         u8  ipflags1;
1520         u8  iptype;
1521         u16 ipmsglim;
1522         u16 res1;
1523         u8  res2[8];
1524         u8  ipuser[16];
1525         u32 res3;
1526         u8  ippollfg;
1527         u8  res4[3];
1528 } __packed;
1529
1530 static void iucv_path_complete(struct iucv_irq_data *data)
1531 {
1532         struct iucv_path_complete *ipc = (void *) data;
1533         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1534
1535         if (path)
1536                 path->flags = ipc->ipflags1;
1537         if (path && path->handler && path->handler->path_complete)
1538                 path->handler->path_complete(path, ipc->ipuser);
1539 }
1540
1541 /**
1542  * iucv_path_severed
1543  * @data: Pointer to external interrupt buffer
1544  *
1545  * Process connection severed work item. Called from tasklet while holding
1546  * iucv_table_lock.
1547  */
1548 struct iucv_path_severed {
1549         u16 ippathid;
1550         u8  res1;
1551         u8  iptype;
1552         u32 res2;
1553         u8  res3[8];
1554         u8  ipuser[16];
1555         u32 res4;
1556         u8  ippollfg;
1557         u8  res5[3];
1558 } __packed;
1559
1560 static void iucv_path_severed(struct iucv_irq_data *data)
1561 {
1562         struct iucv_path_severed *ips = (void *) data;
1563         struct iucv_path *path = iucv_path_table[ips->ippathid];
1564
1565         if (!path || !path->handler)    /* Already severed */
1566                 return;
1567         if (path->handler->path_severed)
1568                 path->handler->path_severed(path, ips->ipuser);
1569         else {
1570                 iucv_sever_pathid(path->pathid, NULL);
1571                 iucv_path_table[path->pathid] = NULL;
1572                 list_del(&path->list);
1573                 iucv_path_free(path);
1574         }
1575 }
1576
1577 /**
1578  * iucv_path_quiesced
1579  * @data: Pointer to external interrupt buffer
1580  *
1581  * Process connection quiesced work item. Called from tasklet while holding
1582  * iucv_table_lock.
1583  */
1584 struct iucv_path_quiesced {
1585         u16 ippathid;
1586         u8  res1;
1587         u8  iptype;
1588         u32 res2;
1589         u8  res3[8];
1590         u8  ipuser[16];
1591         u32 res4;
1592         u8  ippollfg;
1593         u8  res5[3];
1594 } __packed;
1595
1596 static void iucv_path_quiesced(struct iucv_irq_data *data)
1597 {
1598         struct iucv_path_quiesced *ipq = (void *) data;
1599         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1600
1601         if (path && path->handler && path->handler->path_quiesced)
1602                 path->handler->path_quiesced(path, ipq->ipuser);
1603 }
1604
1605 /**
1606  * iucv_path_resumed
1607  * @data: Pointer to external interrupt buffer
1608  *
1609  * Process connection resumed work item. Called from tasklet while holding
1610  * iucv_table_lock.
1611  */
1612 struct iucv_path_resumed {
1613         u16 ippathid;
1614         u8  res1;
1615         u8  iptype;
1616         u32 res2;
1617         u8  res3[8];
1618         u8  ipuser[16];
1619         u32 res4;
1620         u8  ippollfg;
1621         u8  res5[3];
1622 } __packed;
1623
1624 static void iucv_path_resumed(struct iucv_irq_data *data)
1625 {
1626         struct iucv_path_resumed *ipr = (void *) data;
1627         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1628
1629         if (path && path->handler && path->handler->path_resumed)
1630                 path->handler->path_resumed(path, ipr->ipuser);
1631 }
1632
1633 /**
1634  * iucv_message_complete
1635  * @data: Pointer to external interrupt buffer
1636  *
1637  * Process message complete work item. Called from tasklet while holding
1638  * iucv_table_lock.
1639  */
1640 struct iucv_message_complete {
1641         u16 ippathid;
1642         u8  ipflags1;
1643         u8  iptype;
1644         u32 ipmsgid;
1645         u32 ipaudit;
1646         u8  iprmmsg[8];
1647         u32 ipsrccls;
1648         u32 ipmsgtag;
1649         u32 res;
1650         u32 ipbfln2f;
1651         u8  ippollfg;
1652         u8  res2[3];
1653 } __packed;
1654
1655 static void iucv_message_complete(struct iucv_irq_data *data)
1656 {
1657         struct iucv_message_complete *imc = (void *) data;
1658         struct iucv_path *path = iucv_path_table[imc->ippathid];
1659         struct iucv_message msg;
1660
1661         if (path && path->handler && path->handler->message_complete) {
1662                 msg.flags = imc->ipflags1;
1663                 msg.id = imc->ipmsgid;
1664                 msg.audit = imc->ipaudit;
1665                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1666                 msg.class = imc->ipsrccls;
1667                 msg.tag = imc->ipmsgtag;
1668                 msg.length = imc->ipbfln2f;
1669                 path->handler->message_complete(path, &msg);
1670         }
1671 }
1672
1673 /**
1674  * iucv_message_pending
1675  * @data: Pointer to external interrupt buffer
1676  *
1677  * Process message pending work item. Called from tasklet while holding
1678  * iucv_table_lock.
1679  */
1680 struct iucv_message_pending {
1681         u16 ippathid;
1682         u8  ipflags1;
1683         u8  iptype;
1684         u32 ipmsgid;
1685         u32 iptrgcls;
1686         union {
1687                 u32 iprmmsg1_u32;
1688                 u8  iprmmsg1[4];
1689         } ln1msg1;
1690         union {
1691                 u32 ipbfln1f;
1692                 u8  iprmmsg2[4];
1693         } ln1msg2;
1694         u32 res1[3];
1695         u32 ipbfln2f;
1696         u8  ippollfg;
1697         u8  res2[3];
1698 } __packed;
1699
1700 static void iucv_message_pending(struct iucv_irq_data *data)
1701 {
1702         struct iucv_message_pending *imp = (void *) data;
1703         struct iucv_path *path = iucv_path_table[imp->ippathid];
1704         struct iucv_message msg;
1705
1706         if (path && path->handler && path->handler->message_pending) {
1707                 msg.flags = imp->ipflags1;
1708                 msg.id = imp->ipmsgid;
1709                 msg.class = imp->iptrgcls;
1710                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1711                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1712                         msg.length = 8;
1713                 } else
1714                         msg.length = imp->ln1msg2.ipbfln1f;
1715                 msg.reply_size = imp->ipbfln2f;
1716                 path->handler->message_pending(path, &msg);
1717         }
1718 }
1719
1720 /**
1721  * iucv_tasklet_fn:
1722  *
1723  * This tasklet loops over the queue of irq buffers created by
1724  * iucv_external_interrupt, calls the appropriate action handler
1725  * and then frees the buffer.
1726  */
1727 static void iucv_tasklet_fn(unsigned long ignored)
1728 {
1729         typedef void iucv_irq_fn(struct iucv_irq_data *);
1730         static iucv_irq_fn *irq_fn[] = {
1731                 [0x02] = iucv_path_complete,
1732                 [0x03] = iucv_path_severed,
1733                 [0x04] = iucv_path_quiesced,
1734                 [0x05] = iucv_path_resumed,
1735                 [0x06] = iucv_message_complete,
1736                 [0x07] = iucv_message_complete,
1737                 [0x08] = iucv_message_pending,
1738                 [0x09] = iucv_message_pending,
1739         };
1740         LIST_HEAD(task_queue);
1741         struct iucv_irq_list *p, *n;
1742
1743         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1744         if (!spin_trylock(&iucv_table_lock)) {
1745                 tasklet_schedule(&iucv_tasklet);
1746                 return;
1747         }
1748         iucv_active_cpu = smp_processor_id();
1749
1750         spin_lock_irq(&iucv_queue_lock);
1751         list_splice_init(&iucv_task_queue, &task_queue);
1752         spin_unlock_irq(&iucv_queue_lock);
1753
1754         list_for_each_entry_safe(p, n, &task_queue, list) {
1755                 list_del_init(&p->list);
1756                 irq_fn[p->data.iptype](&p->data);
1757                 kfree(p);
1758         }
1759
1760         iucv_active_cpu = -1;
1761         spin_unlock(&iucv_table_lock);
1762 }
1763
1764 /**
1765  * iucv_work_fn:
1766  *
1767  * This work function loops over the queue of path pending irq blocks
1768  * created by iucv_external_interrupt, calls the appropriate action
1769  * handler and then frees the buffer.
1770  */
1771 static void iucv_work_fn(struct work_struct *work)
1772 {
1773         LIST_HEAD(work_queue);
1774         struct iucv_irq_list *p, *n;
1775
1776         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1777         spin_lock_bh(&iucv_table_lock);
1778         iucv_active_cpu = smp_processor_id();
1779
1780         spin_lock_irq(&iucv_queue_lock);
1781         list_splice_init(&iucv_work_queue, &work_queue);
1782         spin_unlock_irq(&iucv_queue_lock);
1783
1784         iucv_cleanup_queue();
1785         list_for_each_entry_safe(p, n, &work_queue, list) {
1786                 list_del_init(&p->list);
1787                 iucv_path_pending(&p->data);
1788                 kfree(p);
1789         }
1790
1791         iucv_active_cpu = -1;
1792         spin_unlock_bh(&iucv_table_lock);
1793 }
1794
1795 /**
1796  * iucv_external_interrupt
1797  * @code: irq code
1798  *
1799  * Handles external interrupts coming in from CP.
1800  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1801  */
1802 static void iucv_external_interrupt(unsigned int ext_int_code,
1803                                     unsigned int param32, unsigned long param64)
1804 {
1805         struct iucv_irq_data *p;
1806         struct iucv_irq_list *work;
1807
1808         kstat_cpu(smp_processor_id()).irqs[EXTINT_IUC]++;
1809         p = iucv_irq_data[smp_processor_id()];
1810         if (p->ippathid >= iucv_max_pathid) {
1811                 WARN_ON(p->ippathid >= iucv_max_pathid);
1812                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1813                 return;
1814         }
1815         BUG_ON(p->iptype  < 0x01 || p->iptype > 0x09);
1816         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1817         if (!work) {
1818                 pr_warning("iucv_external_interrupt: out of memory\n");
1819                 return;
1820         }
1821         memcpy(&work->data, p, sizeof(work->data));
1822         spin_lock(&iucv_queue_lock);
1823         if (p->iptype == 0x01) {
1824                 /* Path pending interrupt. */
1825                 list_add_tail(&work->list, &iucv_work_queue);
1826                 schedule_work(&iucv_work);
1827         } else {
1828                 /* The other interrupts. */
1829                 list_add_tail(&work->list, &iucv_task_queue);
1830                 tasklet_schedule(&iucv_tasklet);
1831         }
1832         spin_unlock(&iucv_queue_lock);
1833 }
1834
1835 static int iucv_pm_prepare(struct device *dev)
1836 {
1837         int rc = 0;
1838
1839 #ifdef CONFIG_PM_DEBUG
1840         printk(KERN_INFO "iucv_pm_prepare\n");
1841 #endif
1842         if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1843                 rc = dev->driver->pm->prepare(dev);
1844         return rc;
1845 }
1846
1847 static void iucv_pm_complete(struct device *dev)
1848 {
1849 #ifdef CONFIG_PM_DEBUG
1850         printk(KERN_INFO "iucv_pm_complete\n");
1851 #endif
1852         if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1853                 dev->driver->pm->complete(dev);
1854 }
1855
1856 /**
1857  * iucv_path_table_empty() - determine if iucv path table is empty
1858  *
1859  * Returns 0 if there are still iucv pathes defined
1860  *         1 if there are no iucv pathes defined
1861  */
1862 int iucv_path_table_empty(void)
1863 {
1864         int i;
1865
1866         for (i = 0; i < iucv_max_pathid; i++) {
1867                 if (iucv_path_table[i])
1868                         return 0;
1869         }
1870         return 1;
1871 }
1872
1873 /**
1874  * iucv_pm_freeze() - Freeze PM callback
1875  * @dev:        iucv-based device
1876  *
1877  * disable iucv interrupts
1878  * invoke callback function of the iucv-based driver
1879  * shut down iucv, if no iucv-pathes are established anymore
1880  */
1881 static int iucv_pm_freeze(struct device *dev)
1882 {
1883         int cpu;
1884         struct iucv_irq_list *p, *n;
1885         int rc = 0;
1886
1887 #ifdef CONFIG_PM_DEBUG
1888         printk(KERN_WARNING "iucv_pm_freeze\n");
1889 #endif
1890         if (iucv_pm_state != IUCV_PM_FREEZING) {
1891                 for_each_cpu_mask_nr(cpu, iucv_irq_cpumask)
1892                         smp_call_function_single(cpu, iucv_block_cpu_almost,
1893                                                  NULL, 1);
1894                 cancel_work_sync(&iucv_work);
1895                 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1896                         list_del_init(&p->list);
1897                         iucv_sever_pathid(p->data.ippathid,
1898                                           iucv_error_no_listener);
1899                         kfree(p);
1900                 }
1901         }
1902         iucv_pm_state = IUCV_PM_FREEZING;
1903         if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1904                 rc = dev->driver->pm->freeze(dev);
1905         if (iucv_path_table_empty())
1906                 iucv_disable();
1907         return rc;
1908 }
1909
1910 /**
1911  * iucv_pm_thaw() - Thaw PM callback
1912  * @dev:        iucv-based device
1913  *
1914  * make iucv ready for use again: allocate path table, declare interrupt buffers
1915  *                                and enable iucv interrupts
1916  * invoke callback function of the iucv-based driver
1917  */
1918 static int iucv_pm_thaw(struct device *dev)
1919 {
1920         int rc = 0;
1921
1922 #ifdef CONFIG_PM_DEBUG
1923         printk(KERN_WARNING "iucv_pm_thaw\n");
1924 #endif
1925         iucv_pm_state = IUCV_PM_THAWING;
1926         if (!iucv_path_table) {
1927                 rc = iucv_enable();
1928                 if (rc)
1929                         goto out;
1930         }
1931         if (cpus_empty(iucv_irq_cpumask)) {
1932                 if (iucv_nonsmp_handler)
1933                         /* enable interrupts on one cpu */
1934                         iucv_allow_cpu(NULL);
1935                 else
1936                         /* enable interrupts on all cpus */
1937                         iucv_setmask_mp();
1938         }
1939         if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1940                 rc = dev->driver->pm->thaw(dev);
1941 out:
1942         return rc;
1943 }
1944
1945 /**
1946  * iucv_pm_restore() - Restore PM callback
1947  * @dev:        iucv-based device
1948  *
1949  * make iucv ready for use again: allocate path table, declare interrupt buffers
1950  *                                and enable iucv interrupts
1951  * invoke callback function of the iucv-based driver
1952  */
1953 static int iucv_pm_restore(struct device *dev)
1954 {
1955         int rc = 0;
1956
1957 #ifdef CONFIG_PM_DEBUG
1958         printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1959 #endif
1960         if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1961                 pr_warning("Suspending Linux did not completely close all IUCV "
1962                         "connections\n");
1963         iucv_pm_state = IUCV_PM_RESTORING;
1964         if (cpus_empty(iucv_irq_cpumask)) {
1965                 rc = iucv_query_maxconn();
1966                 rc = iucv_enable();
1967                 if (rc)
1968                         goto out;
1969         }
1970         if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1971                 rc = dev->driver->pm->restore(dev);
1972 out:
1973         return rc;
1974 }
1975
1976 /**
1977  * iucv_init
1978  *
1979  * Allocates and initializes various data structures.
1980  */
1981 static int __init iucv_init(void)
1982 {
1983         int rc;
1984         int cpu;
1985
1986         if (!MACHINE_IS_VM) {
1987                 rc = -EPROTONOSUPPORT;
1988                 goto out;
1989         }
1990         rc = iucv_query_maxconn();
1991         if (rc)
1992                 goto out;
1993         rc = register_external_interrupt(0x4000, iucv_external_interrupt);
1994         if (rc)
1995                 goto out;
1996         iucv_root = root_device_register("iucv");
1997         if (IS_ERR(iucv_root)) {
1998                 rc = PTR_ERR(iucv_root);
1999                 goto out_int;
2000         }
2001
2002         for_each_online_cpu(cpu) {
2003                 /* Note: GFP_DMA used to get memory below 2G */
2004                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
2005                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2006                 if (!iucv_irq_data[cpu]) {
2007                         rc = -ENOMEM;
2008                         goto out_free;
2009                 }
2010
2011                 /* Allocate parameter blocks. */
2012                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
2013                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2014                 if (!iucv_param[cpu]) {
2015                         rc = -ENOMEM;
2016                         goto out_free;
2017                 }
2018                 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
2019                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2020                 if (!iucv_param_irq[cpu]) {
2021                         rc = -ENOMEM;
2022                         goto out_free;
2023                 }
2024
2025         }
2026         rc = register_hotcpu_notifier(&iucv_cpu_notifier);
2027         if (rc)
2028                 goto out_free;
2029         rc = register_reboot_notifier(&iucv_reboot_notifier);
2030         if (rc)
2031                 goto out_cpu;
2032         ASCEBC(iucv_error_no_listener, 16);
2033         ASCEBC(iucv_error_no_memory, 16);
2034         ASCEBC(iucv_error_pathid, 16);
2035         iucv_available = 1;
2036         rc = bus_register(&iucv_bus);
2037         if (rc)
2038                 goto out_reboot;
2039         return 0;
2040
2041 out_reboot:
2042         unregister_reboot_notifier(&iucv_reboot_notifier);
2043 out_cpu:
2044         unregister_hotcpu_notifier(&iucv_cpu_notifier);
2045 out_free:
2046         for_each_possible_cpu(cpu) {
2047                 kfree(iucv_param_irq[cpu]);
2048                 iucv_param_irq[cpu] = NULL;
2049                 kfree(iucv_param[cpu]);
2050                 iucv_param[cpu] = NULL;
2051                 kfree(iucv_irq_data[cpu]);
2052                 iucv_irq_data[cpu] = NULL;
2053         }
2054         root_device_unregister(iucv_root);
2055 out_int:
2056         unregister_external_interrupt(0x4000, iucv_external_interrupt);
2057 out:
2058         return rc;
2059 }
2060
2061 /**
2062  * iucv_exit
2063  *
2064  * Frees everything allocated from iucv_init.
2065  */
2066 static void __exit iucv_exit(void)
2067 {
2068         struct iucv_irq_list *p, *n;
2069         int cpu;
2070
2071         spin_lock_irq(&iucv_queue_lock);
2072         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2073                 kfree(p);
2074         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2075                 kfree(p);
2076         spin_unlock_irq(&iucv_queue_lock);
2077         unregister_reboot_notifier(&iucv_reboot_notifier);
2078         unregister_hotcpu_notifier(&iucv_cpu_notifier);
2079         for_each_possible_cpu(cpu) {
2080                 kfree(iucv_param_irq[cpu]);
2081                 iucv_param_irq[cpu] = NULL;
2082                 kfree(iucv_param[cpu]);
2083                 iucv_param[cpu] = NULL;
2084                 kfree(iucv_irq_data[cpu]);
2085                 iucv_irq_data[cpu] = NULL;
2086         }
2087         root_device_unregister(iucv_root);
2088         bus_unregister(&iucv_bus);
2089         unregister_external_interrupt(0x4000, iucv_external_interrupt);
2090 }
2091
2092 subsys_initcall(iucv_init);
2093 module_exit(iucv_exit);
2094
2095 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert ([email protected])");
2096 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2097 MODULE_LICENSE("GPL");