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 <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 = (unsigned long)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;
 338 }
 339
 340 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
 341 {
 342         int ccode;
 343
 344         ccode = __iucv_call_b2f0(command, parm);
 345         return ccode == 1 ? parm->ctrl.iprcode : ccode;
 346 }
 347
 348 /**
 349  * iucv_query_maxconn
 350  *
 351  * Determines the maximum number of connections that may be established.
 352  *
 353  * Returns the maximum number of connections or -EPERM is IUCV is not
 354  * available.
 355  */
 356 static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
 357 {
 358         register unsigned long reg0 asm ("0");
 359         register unsigned long reg1 asm ("1");
 360         int ccode;
 361
 362         reg0 = IUCV_QUERY;
 363         reg1 = (unsigned long) param;
 364         asm volatile (
 365                 "       .long   0xb2f01000\n"
 366                 "       ipm     %0\n"
 367                 "       srl     %0,28\n"
 368                 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
 369         *max_pathid = reg1;
 370         return ccode;
 371 }
 372
 373 static int iucv_query_maxconn(void)
 374 {
 375         unsigned long max_pathid;
 376         void *param;
 377         int ccode;
 378
 379         param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
 380         if (!param)
 381                 return -ENOMEM;
 382         ccode = __iucv_query_maxconn(param, &max_pathid);
 383         if (ccode == 0)
 384                 iucv_max_pathid = max_pathid;
 385         kfree(param);
 386         return ccode ? -EPERM : 0;
 387 }
 388
 389 /**
 390  * iucv_allow_cpu
 391  * @data: unused
 392  *
 393  * Allow iucv interrupts on this cpu.
 394  */
 395 static void iucv_allow_cpu(void *data)
 396 {
 397         int cpu = smp_processor_id();
 398         union iucv_param *parm;
 399
 400         /*
 401          * Enable all iucv interrupts.
 402          * ipmask contains bits for the different interrupts
 403          *      0x80 - Flag to allow nonpriority message pending interrupts
 404          *      0x40 - Flag to allow priority message pending interrupts
 405          *      0x20 - Flag to allow nonpriority message completion interrupts
 406          *      0x10 - Flag to allow priority message completion interrupts
 407          *      0x08 - Flag to allow IUCV control interrupts
 408          */
 409         parm = iucv_param_irq[cpu];
 410         memset(parm, 0, sizeof(union iucv_param));
 411         parm->set_mask.ipmask = 0xf8;
 412         iucv_call_b2f0(IUCV_SETMASK, parm);
 413
 414         /*
 415          * Enable all iucv control interrupts.
 416          * ipmask contains bits for the different interrupts
 417          *      0x80 - Flag to allow pending connections interrupts
 418          *      0x40 - Flag to allow connection complete interrupts
 419          *      0x20 - Flag to allow connection severed interrupts
 420          *      0x10 - Flag to allow connection quiesced interrupts
 421          *      0x08 - Flag to allow connection resumed interrupts
 422          */
 423         memset(parm, 0, sizeof(union iucv_param));
 424         parm->set_mask.ipmask = 0xf8;
 425         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
 426         /* Set indication that iucv interrupts are allowed for this cpu. */
 427         cpumask_set_cpu(cpu, &iucv_irq_cpumask);
 428 }
 429
 430 /**
 431  * iucv_block_cpu
 432  * @data: unused
 433  *
 434  * Block iucv interrupts on this cpu.
 435  */
 436 static void iucv_block_cpu(void *data)
 437 {
 438         int cpu = smp_processor_id();
 439         union iucv_param *parm;
 440
 441         /* Disable all iucv interrupts. */
 442         parm = iucv_param_irq[cpu];
 443         memset(parm, 0, sizeof(union iucv_param));
 444         iucv_call_b2f0(IUCV_SETMASK, parm);
 445
 446         /* Clear indication that iucv interrupts are allowed for this cpu. */
 447         cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
 448 }
 449
 450 /**
 451  * iucv_block_cpu_almost
 452  * @data: unused
 453  *
 454  * Allow connection-severed interrupts only on this cpu.
 455  */
 456 static void iucv_block_cpu_almost(void *data)
 457 {
 458         int cpu = smp_processor_id();
 459         union iucv_param *parm;
 460
 461         /* Allow iucv control interrupts only */
 462         parm = iucv_param_irq[cpu];
 463         memset(parm, 0, sizeof(union iucv_param));
 464         parm->set_mask.ipmask = 0x08;
 465         iucv_call_b2f0(IUCV_SETMASK, parm);
 466         /* Allow iucv-severed interrupt only */
 467         memset(parm, 0, sizeof(union iucv_param));
 468         parm->set_mask.ipmask = 0x20;
 469         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
 470
 471         /* Clear indication that iucv interrupts are allowed for this cpu. */
 472         cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
 473 }
 474
 475 /**
 476  * iucv_declare_cpu
 477  * @data: unused
 478  *
 479  * Declare a interrupt buffer on this cpu.
 480  */
 481 static void iucv_declare_cpu(void *data)
 482 {
 483         int cpu = smp_processor_id();
 484         union iucv_param *parm;
 485         int rc;
 486
 487         if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
 488                 return;
 489
 490         /* Declare interrupt buffer. */
 491         parm = iucv_param_irq[cpu];
 492         memset(parm, 0, sizeof(union iucv_param));
 493         parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
 494         rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
 495         if (rc) {
 496                 char *err = "Unknown";
 497                 switch (rc) {
 498                 case 0x03:
 499                         err = "Directory error";
 500                         break;
 501                 case 0x0a:
 502                         err = "Invalid length";
 503                         break;
 504                 case 0x13:
 505                         err = "Buffer already exists";
 506                         break;
 507                 case 0x3e:
 508                         err = "Buffer overlap";
 509                         break;
 510                 case 0x5c:
 511                         err = "Paging or storage error";
 512                         break;
 513                 }
 514                 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
 515                         cpu, rc, err);
 516                 return;
 517         }
 518
 519         /* Set indication that an iucv buffer exists for this cpu. */
 520         cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
 521
 522         if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
 523                 /* Enable iucv interrupts on this cpu. */
 524                 iucv_allow_cpu(NULL);
 525         else
 526                 /* Disable iucv interrupts on this cpu. */
 527                 iucv_block_cpu(NULL);
 528 }
 529
 530 /**
 531  * iucv_retrieve_cpu
 532  * @data: unused
 533  *
 534  * Retrieve interrupt buffer on this cpu.
 535  */
 536 static void iucv_retrieve_cpu(void *data)
 537 {
 538         int cpu = smp_processor_id();
 539         union iucv_param *parm;
 540
 541         if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
 542                 return;
 543
 544         /* Block iucv interrupts. */
 545         iucv_block_cpu(NULL);
 546
 547         /* Retrieve interrupt buffer. */
 548         parm = iucv_param_irq[cpu];
 549         iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
 550
 551         /* Clear indication that an iucv buffer exists for this cpu. */
 552         cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
 553 }
 554
 555 /**
 556  * iucv_setmask_smp
 557  *
 558  * Allow iucv interrupts on all cpus.
 559  */
 560 static void iucv_setmask_mp(void)
 561 {
 562         int cpu;
 563
 564         get_online_cpus();
 565         for_each_online_cpu(cpu)
 566                 /* Enable all cpus with a declared buffer. */
 567                 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
 568                     !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
 569                         smp_call_function_single(cpu, iucv_allow_cpu,
 570                                                  NULL, 1);
 571         put_online_cpus();
 572 }
 573
 574 /**
 575  * iucv_setmask_up
 576  *
 577  * Allow iucv interrupts on a single cpu.
 578  */
 579 static void iucv_setmask_up(void)
 580 {
 581         cpumask_t cpumask;
 582         int cpu;
 583
 584         /* Disable all cpu but the first in cpu_irq_cpumask. */
 585         cpumask_copy(&cpumask, &iucv_irq_cpumask);
 586         cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
 587         for_each_cpu(cpu, &cpumask)
 588                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
 589 }
 590
 591 /**
 592  * iucv_enable
 593  *
 594  * This function makes iucv ready for use. It allocates the pathid
 595  * table, declares an iucv interrupt buffer and enables the iucv
 596  * interrupts. Called when the first user has registered an iucv
 597  * handler.
 598  */
 599 static int iucv_enable(void)
 600 {
 601         size_t alloc_size;
 602         int cpu, rc;
 603
 604         get_online_cpus();
 605         rc = -ENOMEM;
 606         alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
 607         iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
 608         if (!iucv_path_table)
 609                 goto out;
 610         /* Declare per cpu buffers. */
 611         rc = -EIO;
 612         for_each_online_cpu(cpu)
 613                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
 614         if (cpumask_empty(&iucv_buffer_cpumask))
 615                 /* No cpu could declare an iucv buffer. */
 616                 goto out;
 617         put_online_cpus();
 618         return 0;
 619 out:
 620         kfree(iucv_path_table);
 621         iucv_path_table = NULL;
 622         put_online_cpus();
 623         return rc;
 624 }
 625
 626 /**
 627  * iucv_disable
 628  *
 629  * This function shuts down iucv. It disables iucv interrupts, retrieves
 630  * the iucv interrupt buffer and frees the pathid table. Called after the
 631  * last user unregister its iucv handler.
 632  */
 633 static void iucv_disable(void)
 634 {
 635         get_online_cpus();
 636         on_each_cpu(iucv_retrieve_cpu, NULL, 1);
 637         kfree(iucv_path_table);
 638         iucv_path_table = NULL;
 639         put_online_cpus();
 640 }
 641
 642 static int iucv_cpu_dead(unsigned int cpu)
 643 {
 644         kfree(iucv_param_irq[cpu]);
 645         iucv_param_irq[cpu] = NULL;
 646         kfree(iucv_param[cpu]);
 647         iucv_param[cpu] = NULL;
 648         kfree(iucv_irq_data[cpu]);
 649         iucv_irq_data[cpu] = NULL;
 650         return 0;
 651 }
 652
 653 static int iucv_cpu_prepare(unsigned int cpu)
 654 {
 655         /* Note: GFP_DMA used to get memory below 2G */
 656         iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
 657                              GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 658         if (!iucv_irq_data[cpu])
 659                 goto out_free;
 660
 661         /* Allocate parameter blocks. */
 662         iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
 663                           GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 664         if (!iucv_param[cpu])
 665                 goto out_free;
 666
 667         iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
 668                           GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 669         if (!iucv_param_irq[cpu])
 670                 goto out_free;
 671
 672         return 0;
 673
 674 out_free:
 675         iucv_cpu_dead(cpu);
 676         return -ENOMEM;
 677 }
 678
 679 static int iucv_cpu_online(unsigned int cpu)
 680 {
 681         if (!iucv_path_table)
 682                 return 0;
 683         iucv_declare_cpu(NULL);
 684         return 0;
 685 }
 686
 687 static int iucv_cpu_down_prep(unsigned int cpu)
 688 {
 689         cpumask_t cpumask;
 690
 691         if (!iucv_path_table)
 692                 return 0;
 693
 694         cpumask_copy(&cpumask, &iucv_buffer_cpumask);
 695         cpumask_clear_cpu(cpu, &cpumask);
 696         if (cpumask_empty(&cpumask))
 697                 /* Can't offline last IUCV enabled cpu. */
 698                 return -EINVAL;
 699
 700         iucv_retrieve_cpu(NULL);
 701         if (!cpumask_empty(&iucv_irq_cpumask))
 702                 return 0;
 703         smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
 704                                  iucv_allow_cpu, NULL, 1);
 705         return 0;
 706 }
 707
 708 /**
 709  * iucv_sever_pathid
 710  * @pathid: path identification number.
 711  * @userdata: 16-bytes of user data.
 712  *
 713  * Sever an iucv path to free up the pathid. Used internally.
 714  */
 715 static int iucv_sever_pathid(u16 pathid, u8 *userdata)
 716 {
 717         union iucv_param *parm;
 718
 719         parm = iucv_param_irq[smp_processor_id()];
 720         memset(parm, 0, sizeof(union iucv_param));
 721         if (userdata)
 722                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 723         parm->ctrl.ippathid = pathid;
 724         return iucv_call_b2f0(IUCV_SEVER, parm);
 725 }
 726
 727 /**
 728  * __iucv_cleanup_queue
 729  * @dummy: unused dummy argument
 730  *
 731  * Nop function called via smp_call_function to force work items from
 732  * pending external iucv interrupts to the work queue.
 733  */
 734 static void __iucv_cleanup_queue(void *dummy)
 735 {
 736 }
 737
 738 /**
 739  * iucv_cleanup_queue
 740  *
 741  * Function called after a path has been severed to find all remaining
 742  * work items for the now stale pathid. The caller needs to hold the
 743  * iucv_table_lock.
 744  */
 745 static void iucv_cleanup_queue(void)
 746 {
 747         struct iucv_irq_list *p, *n;
 748
 749         /*
 750          * When a path is severed, the pathid can be reused immediately
 751          * on a iucv connect or a connection pending interrupt. Remove
 752          * all entries from the task queue that refer to a stale pathid
 753          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
 754          * or deliver the connection pending interrupt. To get all the
 755          * pending interrupts force them to the work queue by calling
 756          * an empty function on all cpus.
 757          */
 758         smp_call_function(__iucv_cleanup_queue, NULL, 1);
 759         spin_lock_irq(&iucv_queue_lock);
 760         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
 761                 /* Remove stale work items from the task queue. */
 762                 if (iucv_path_table[p->data.ippathid] == NULL) {
 763                         list_del(&p->list);
 764                         kfree(p);
 765                 }
 766         }
 767         spin_unlock_irq(&iucv_queue_lock);
 768 }
 769
 770 /**
 771  * iucv_register:
 772  * @handler: address of iucv handler structure
 773  * @smp: != 0 indicates that the handler can deal with out of order messages
 774  *
 775  * Registers a driver with IUCV.
 776  *
 777  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 778  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 779  */
 780 int iucv_register(struct iucv_handler *handler, int smp)
 781 {
 782         int rc;
 783
 784         if (!iucv_available)
 785                 return -ENOSYS;
 786         mutex_lock(&iucv_register_mutex);
 787         if (!smp)
 788                 iucv_nonsmp_handler++;
 789         if (list_empty(&iucv_handler_list)) {
 790                 rc = iucv_enable();
 791                 if (rc)
 792                         goto out_mutex;
 793         } else if (!smp && iucv_nonsmp_handler == 1)
 794                 iucv_setmask_up();
 795         INIT_LIST_HEAD(&handler->paths);
 796
 797         spin_lock_bh(&iucv_table_lock);
 798         list_add_tail(&handler->list, &iucv_handler_list);
 799         spin_unlock_bh(&iucv_table_lock);
 800         rc = 0;
 801 out_mutex:
 802         mutex_unlock(&iucv_register_mutex);
 803         return rc;
 804 }
 805 EXPORT_SYMBOL(iucv_register);
 806
 807 /**
 808  * iucv_unregister
 809  * @handler:  address of iucv handler structure
 810  * @smp: != 0 indicates that the handler can deal with out of order messages
 811  *
 812  * Unregister driver from IUCV.
 813  */
 814 void iucv_unregister(struct iucv_handler *handler, int smp)
 815 {
 816         struct iucv_path *p, *n;
 817
 818         mutex_lock(&iucv_register_mutex);
 819         spin_lock_bh(&iucv_table_lock);
 820         /* Remove handler from the iucv_handler_list. */
 821         list_del_init(&handler->list);
 822         /* Sever all pathids still referring to the handler. */
 823         list_for_each_entry_safe(p, n, &handler->paths, list) {
 824                 iucv_sever_pathid(p->pathid, NULL);
 825                 iucv_path_table[p->pathid] = NULL;
 826                 list_del(&p->list);
 827                 iucv_path_free(p);
 828         }
 829         spin_unlock_bh(&iucv_table_lock);
 830         if (!smp)
 831                 iucv_nonsmp_handler--;
 832         if (list_empty(&iucv_handler_list))
 833                 iucv_disable();
 834         else if (!smp && iucv_nonsmp_handler == 0)
 835                 iucv_setmask_mp();
 836         mutex_unlock(&iucv_register_mutex);
 837 }
 838 EXPORT_SYMBOL(iucv_unregister);
 839
 840 static int iucv_reboot_event(struct notifier_block *this,
 841                              unsigned long event, void *ptr)
 842 {
 843         int i;
 844
 845         if (cpumask_empty(&iucv_irq_cpumask))
 846                 return NOTIFY_DONE;
 847
 848         get_online_cpus();
 849         on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
 850         preempt_disable();
 851         for (i = 0; i < iucv_max_pathid; i++) {
 852                 if (iucv_path_table[i])
 853                         iucv_sever_pathid(i, NULL);
 854         }
 855         preempt_enable();
 856         put_online_cpus();
 857         iucv_disable();
 858         return NOTIFY_DONE;
 859 }
 860
 861 static struct notifier_block iucv_reboot_notifier = {
 862         .notifier_call = iucv_reboot_event,
 863 };
 864
 865 /**
 866  * iucv_path_accept
 867  * @path: address of iucv path structure
 868  * @handler: address of iucv handler structure
 869  * @userdata: 16 bytes of data reflected to the communication partner
 870  * @private: private data passed to interrupt handlers for this path
 871  *
 872  * This function is issued after the user received a connection pending
 873  * external interrupt and now wishes to complete the IUCV communication path.
 874  *
 875  * Returns the result of the CP IUCV call.
 876  */
 877 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 878                      u8 *userdata, void *private)
 879 {
 880         union iucv_param *parm;
 881         int rc;
 882
 883         local_bh_disable();
 884         if (cpumask_empty(&iucv_buffer_cpumask)) {
 885                 rc = -EIO;
 886                 goto out;
 887         }
 888         /* Prepare parameter block. */
 889         parm = iucv_param[smp_processor_id()];
 890         memset(parm, 0, sizeof(union iucv_param));
 891         parm->ctrl.ippathid = path->pathid;
 892         parm->ctrl.ipmsglim = path->msglim;
 893         if (userdata)
 894                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 895         parm->ctrl.ipflags1 = path->flags;
 896
 897         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
 898         if (!rc) {
 899                 path->private = private;
 900                 path->msglim = parm->ctrl.ipmsglim;
 901                 path->flags = parm->ctrl.ipflags1;
 902         }
 903 out:
 904         local_bh_enable();
 905         return rc;
 906 }
 907 EXPORT_SYMBOL(iucv_path_accept);
 908
 909 /**
 910  * iucv_path_connect
 911  * @path: address of iucv path structure
 912  * @handler: address of iucv handler structure
 913  * @userid: 8-byte user identification
 914  * @system: 8-byte target system identification
 915  * @userdata: 16 bytes of data reflected to the communication partner
 916  * @private: private data passed to interrupt handlers for this path
 917  *
 918  * This function establishes an IUCV path. Although the connect may complete
 919  * successfully, you are not able to use the path until you receive an IUCV
 920  * Connection Complete external interrupt.
 921  *
 922  * Returns the result of the CP IUCV call.
 923  */
 924 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 925                       u8 *userid, u8 *system, u8 *userdata,
 926                       void *private)
 927 {
 928         union iucv_param *parm;
 929         int rc;
 930
 931         spin_lock_bh(&iucv_table_lock);
 932         iucv_cleanup_queue();
 933         if (cpumask_empty(&iucv_buffer_cpumask)) {
 934                 rc = -EIO;
 935                 goto out;
 936         }
 937         parm = iucv_param[smp_processor_id()];
 938         memset(parm, 0, sizeof(union iucv_param));
 939         parm->ctrl.ipmsglim = path->msglim;
 940         parm->ctrl.ipflags1 = path->flags;
 941         if (userid) {
 942                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
 943                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 944                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 945         }
 946         if (system) {
 947                 memcpy(parm->ctrl.iptarget, system,
 948                        sizeof(parm->ctrl.iptarget));
 949                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 950                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 951         }
 952         if (userdata)
 953                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 954
 955         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
 956         if (!rc) {
 957                 if (parm->ctrl.ippathid < iucv_max_pathid) {
 958                         path->pathid = parm->ctrl.ippathid;
 959                         path->msglim = parm->ctrl.ipmsglim;
 960                         path->flags = parm->ctrl.ipflags1;
 961                         path->handler = handler;
 962                         path->private = private;
 963                         list_add_tail(&path->list, &handler->paths);
 964                         iucv_path_table[path->pathid] = path;
 965                 } else {
 966                         iucv_sever_pathid(parm->ctrl.ippathid,
 967                                           iucv_error_pathid);
 968                         rc = -EIO;
 969                 }
 970         }
 971 out:
 972         spin_unlock_bh(&iucv_table_lock);
 973         return rc;
 974 }
 975 EXPORT_SYMBOL(iucv_path_connect);
 976
 977 /**
 978  * iucv_path_quiesce:
 979  * @path: address of iucv path structure
 980  * @userdata: 16 bytes of data reflected to the communication partner
 981  *
 982  * This function temporarily suspends incoming messages on an IUCV path.
 983  * You can later reactivate the path by invoking the iucv_resume function.
 984  *
 985  * Returns the result from the CP IUCV call.
 986  */
 987 int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
 988 {
 989         union iucv_param *parm;
 990         int rc;
 991
 992         local_bh_disable();
 993         if (cpumask_empty(&iucv_buffer_cpumask)) {
 994                 rc = -EIO;
 995                 goto out;
 996         }
 997         parm = iucv_param[smp_processor_id()];
 998         memset(parm, 0, sizeof(union iucv_param));
 999         if (userdata)
1000                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1001         parm->ctrl.ippathid = path->pathid;
1002         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
1003 out:
1004         local_bh_enable();
1005         return rc;
1006 }
1007 EXPORT_SYMBOL(iucv_path_quiesce);
1008
1009 /**
1010  * iucv_path_resume:
1011  * @path: address of iucv path structure
1012  * @userdata: 16 bytes of data reflected to the communication partner
1013  *
1014  * This function resumes incoming messages on an IUCV path that has
1015  * been stopped with iucv_path_quiesce.
1016  *
1017  * Returns the result from the CP IUCV call.
1018  */
1019 int iucv_path_resume(struct iucv_path *path, u8 *userdata)
1020 {
1021         union iucv_param *parm;
1022         int rc;
1023
1024         local_bh_disable();
1025         if (cpumask_empty(&iucv_buffer_cpumask)) {
1026                 rc = -EIO;
1027                 goto out;
1028         }
1029         parm = iucv_param[smp_processor_id()];
1030         memset(parm, 0, sizeof(union iucv_param));
1031         if (userdata)
1032                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1033         parm->ctrl.ippathid = path->pathid;
1034         rc = iucv_call_b2f0(IUCV_RESUME, parm);
1035 out:
1036         local_bh_enable();
1037         return rc;
1038 }
1039
1040 /**
1041  * iucv_path_sever
1042  * @path: address of iucv path structure
1043  * @userdata: 16 bytes of data reflected to the communication partner
1044  *
1045  * This function terminates an IUCV path.
1046  *
1047  * Returns the result from the CP IUCV call.
1048  */
1049 int iucv_path_sever(struct iucv_path *path, u8 *userdata)
1050 {
1051         int rc;
1052
1053         preempt_disable();
1054         if (cpumask_empty(&iucv_buffer_cpumask)) {
1055                 rc = -EIO;
1056                 goto out;
1057         }
1058         if (iucv_active_cpu != smp_processor_id())
1059                 spin_lock_bh(&iucv_table_lock);
1060         rc = iucv_sever_pathid(path->pathid, userdata);
1061         iucv_path_table[path->pathid] = NULL;
1062         list_del_init(&path->list);
1063         if (iucv_active_cpu != smp_processor_id())
1064                 spin_unlock_bh(&iucv_table_lock);
1065 out:
1066         preempt_enable();
1067         return rc;
1068 }
1069 EXPORT_SYMBOL(iucv_path_sever);
1070
1071 /**
1072  * iucv_message_purge
1073  * @path: address of iucv path structure
1074  * @msg: address of iucv msg structure
1075  * @srccls: source class of message
1076  *
1077  * Cancels a message you have sent.
1078  *
1079  * Returns the result from the CP IUCV call.
1080  */
1081 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1082                        u32 srccls)
1083 {
1084         union iucv_param *parm;
1085         int rc;
1086
1087         local_bh_disable();
1088         if (cpumask_empty(&iucv_buffer_cpumask)) {
1089                 rc = -EIO;
1090                 goto out;
1091         }
1092         parm = iucv_param[smp_processor_id()];
1093         memset(parm, 0, sizeof(union iucv_param));
1094         parm->purge.ippathid = path->pathid;
1095         parm->purge.ipmsgid = msg->id;
1096         parm->purge.ipsrccls = srccls;
1097         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1098         rc = iucv_call_b2f0(IUCV_PURGE, parm);
1099         if (!rc) {
1100                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1101                 msg->tag = parm->purge.ipmsgtag;
1102         }
1103 out:
1104         local_bh_enable();
1105         return rc;
1106 }
1107 EXPORT_SYMBOL(iucv_message_purge);
1108
1109 /**
1110  * iucv_message_receive_iprmdata
1111  * @path: address of iucv path structure
1112  * @msg: address of iucv msg structure
1113  * @flags: how the message is received (IUCV_IPBUFLST)
1114  * @buffer: address of data buffer or address of struct iucv_array
1115  * @size: length of data buffer
1116  * @residual:
1117  *
1118  * Internal function used by iucv_message_receive and __iucv_message_receive
1119  * to receive RMDATA data stored in struct iucv_message.
1120  */
1121 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1122                                          struct iucv_message *msg,
1123                                          u8 flags, void *buffer,
1124                                          size_t size, size_t *residual)
1125 {
1126         struct iucv_array *array;
1127         u8 *rmmsg;
1128         size_t copy;
1129
1130         /*
1131          * Message is 8 bytes long and has been stored to the
1132          * message descriptor itself.
1133          */
1134         if (residual)
1135                 *residual = abs(size - 8);
1136         rmmsg = msg->rmmsg;
1137         if (flags & IUCV_IPBUFLST) {
1138                 /* Copy to struct iucv_array. */
1139                 size = (size < 8) ? size : 8;
1140                 for (array = buffer; size > 0; array++) {
1141                         copy = min_t(size_t, size, array->length);
1142                         memcpy((u8 *)(addr_t) array->address,
1143                                 rmmsg, copy);
1144                         rmmsg += copy;
1145                         size -= copy;
1146                 }
1147         } else {
1148                 /* Copy to direct buffer. */
1149                 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1150         }
1151         return 0;
1152 }
1153
1154 /**
1155  * __iucv_message_receive
1156  * @path: address of iucv path structure
1157  * @msg: address of iucv msg structure
1158  * @flags: how the message is received (IUCV_IPBUFLST)
1159  * @buffer: address of data buffer or address of struct iucv_array
1160  * @size: length of data buffer
1161  * @residual:
1162  *
1163  * This function receives messages that are being sent to you over
1164  * established paths. This function will deal with RMDATA messages
1165  * embedded in struct iucv_message as well.
1166  *
1167  * Locking:     no locking
1168  *
1169  * Returns the result from the CP IUCV call.
1170  */
1171 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1172                            u8 flags, void *buffer, size_t size, size_t *residual)
1173 {
1174         union iucv_param *parm;
1175         int rc;
1176
1177         if (msg->flags & IUCV_IPRMDATA)
1178                 return iucv_message_receive_iprmdata(path, msg, flags,
1179                                                      buffer, size, residual);
1180          if (cpumask_empty(&iucv_buffer_cpumask)) {
1181                 rc = -EIO;
1182                 goto out;
1183         }
1184         parm = iucv_param[smp_processor_id()];
1185         memset(parm, 0, sizeof(union iucv_param));
1186         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1187         parm->db.ipbfln1f = (u32) size;
1188         parm->db.ipmsgid = msg->id;
1189         parm->db.ippathid = path->pathid;
1190         parm->db.iptrgcls = msg->class;
1191         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1192                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1193         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1194         if (!rc || rc == 5) {
1195                 msg->flags = parm->db.ipflags1;
1196                 if (residual)
1197                         *residual = parm->db.ipbfln1f;
1198         }
1199 out:
1200         return rc;
1201 }
1202 EXPORT_SYMBOL(__iucv_message_receive);
1203
1204 /**
1205  * iucv_message_receive
1206  * @path: address of iucv path structure
1207  * @msg: address of iucv msg structure
1208  * @flags: how the message is received (IUCV_IPBUFLST)
1209  * @buffer: address of data buffer or address of struct iucv_array
1210  * @size: length of data buffer
1211  * @residual:
1212  *
1213  * This function receives messages that are being sent to you over
1214  * established paths. This function will deal with RMDATA messages
1215  * embedded in struct iucv_message as well.
1216  *
1217  * Locking:     local_bh_enable/local_bh_disable
1218  *
1219  * Returns the result from the CP IUCV call.
1220  */
1221 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1222                          u8 flags, void *buffer, size_t size, size_t *residual)
1223 {
1224         int rc;
1225
1226         if (msg->flags & IUCV_IPRMDATA)
1227                 return iucv_message_receive_iprmdata(path, msg, flags,
1228                                                      buffer, size, residual);
1229         local_bh_disable();
1230         rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1231         local_bh_enable();
1232         return rc;
1233 }
1234 EXPORT_SYMBOL(iucv_message_receive);
1235
1236 /**
1237  * iucv_message_reject
1238  * @path: address of iucv path structure
1239  * @msg: address of iucv msg structure
1240  *
1241  * The reject function refuses a specified message. Between the time you
1242  * are notified of a message and the time that you complete the message,
1243  * the message may be rejected.
1244  *
1245  * Returns the result from the CP IUCV call.
1246  */
1247 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1248 {
1249         union iucv_param *parm;
1250         int rc;
1251
1252         local_bh_disable();
1253         if (cpumask_empty(&iucv_buffer_cpumask)) {
1254                 rc = -EIO;
1255                 goto out;
1256         }
1257         parm = iucv_param[smp_processor_id()];
1258         memset(parm, 0, sizeof(union iucv_param));
1259         parm->db.ippathid = path->pathid;
1260         parm->db.ipmsgid = msg->id;
1261         parm->db.iptrgcls = msg->class;
1262         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1263         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1264 out:
1265         local_bh_enable();
1266         return rc;
1267 }
1268 EXPORT_SYMBOL(iucv_message_reject);
1269
1270 /**
1271  * iucv_message_reply
1272  * @path: address of iucv path structure
1273  * @msg: address of iucv msg structure
1274  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1275  * @reply: address of reply data buffer or address of struct iucv_array
1276  * @size: length of reply data buffer
1277  *
1278  * This function responds to the two-way messages that you receive. You
1279  * must identify completely the message to which you wish to reply. ie,
1280  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1281  * the parameter list.
1282  *
1283  * Returns the result from the CP IUCV call.
1284  */
1285 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1286                        u8 flags, void *reply, size_t size)
1287 {
1288         union iucv_param *parm;
1289         int rc;
1290
1291         local_bh_disable();
1292         if (cpumask_empty(&iucv_buffer_cpumask)) {
1293                 rc = -EIO;
1294                 goto out;
1295         }
1296         parm = iucv_param[smp_processor_id()];
1297         memset(parm, 0, sizeof(union iucv_param));
1298         if (flags & IUCV_IPRMDATA) {
1299                 parm->dpl.ippathid = path->pathid;
1300                 parm->dpl.ipflags1 = flags;
1301                 parm->dpl.ipmsgid = msg->id;
1302                 parm->dpl.iptrgcls = msg->class;
1303                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1304         } else {
1305                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1306                 parm->db.ipbfln1f = (u32) size;
1307                 parm->db.ippathid = path->pathid;
1308                 parm->db.ipflags1 = flags;
1309                 parm->db.ipmsgid = msg->id;
1310                 parm->db.iptrgcls = msg->class;
1311         }
1312         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1313 out:
1314         local_bh_enable();
1315         return rc;
1316 }
1317 EXPORT_SYMBOL(iucv_message_reply);
1318
1319 /**
1320  * __iucv_message_send
1321  * @path: address of iucv path structure
1322  * @msg: address of iucv msg structure
1323  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1324  * @srccls: source class of message
1325  * @buffer: address of send buffer or address of struct iucv_array
1326  * @size: length of send buffer
1327  *
1328  * This function transmits data to another application. Data to be
1329  * transmitted is in a buffer and this is a one-way message and the
1330  * receiver will not reply to the message.
1331  *
1332  * Locking:     no locking
1333  *
1334  * Returns the result from the CP IUCV call.
1335  */
1336 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1337                       u8 flags, u32 srccls, void *buffer, size_t size)
1338 {
1339         union iucv_param *parm;
1340         int rc;
1341
1342         if (cpumask_empty(&iucv_buffer_cpumask)) {
1343                 rc = -EIO;
1344                 goto out;
1345         }
1346         parm = iucv_param[smp_processor_id()];
1347         memset(parm, 0, sizeof(union iucv_param));
1348         if (flags & IUCV_IPRMDATA) {
1349                 /* Message of 8 bytes can be placed into the parameter list. */
1350                 parm->dpl.ippathid = path->pathid;
1351                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1352                 parm->dpl.iptrgcls = msg->class;
1353                 parm->dpl.ipsrccls = srccls;
1354                 parm->dpl.ipmsgtag = msg->tag;
1355                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1356         } else {
1357                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1358                 parm->db.ipbfln1f = (u32) size;
1359                 parm->db.ippathid = path->pathid;
1360                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1361                 parm->db.iptrgcls = msg->class;
1362                 parm->db.ipsrccls = srccls;
1363                 parm->db.ipmsgtag = msg->tag;
1364         }
1365         rc = iucv_call_b2f0(IUCV_SEND, parm);
1366         if (!rc)
1367                 msg->id = parm->db.ipmsgid;
1368 out:
1369         return rc;
1370 }
1371 EXPORT_SYMBOL(__iucv_message_send);
1372
1373 /**
1374  * iucv_message_send
1375  * @path: address of iucv path structure
1376  * @msg: address of iucv msg structure
1377  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1378  * @srccls: source class of message
1379  * @buffer: address of send buffer or address of struct iucv_array
1380  * @size: length of send buffer
1381  *
1382  * This function transmits data to another application. Data to be
1383  * transmitted is in a buffer and this is a one-way message and the
1384  * receiver will not reply to the message.
1385  *
1386  * Locking:     local_bh_enable/local_bh_disable
1387  *
1388  * Returns the result from the CP IUCV call.
1389  */
1390 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1391                       u8 flags, u32 srccls, void *buffer, size_t size)
1392 {
1393         int rc;
1394
1395         local_bh_disable();
1396         rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1397         local_bh_enable();
1398         return rc;
1399 }
1400 EXPORT_SYMBOL(iucv_message_send);
1401
1402 /**
1403  * iucv_message_send2way
1404  * @path: address of iucv path structure
1405  * @msg: address of iucv msg structure
1406  * @flags: how the message is sent and the reply is received
1407  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1408  * @srccls: source class of message
1409  * @buffer: address of send buffer or address of struct iucv_array
1410  * @size: length of send buffer
1411  * @ansbuf: address of answer buffer or address of struct iucv_array
1412  * @asize: size of reply buffer
1413  *
1414  * This function transmits data to another application. Data to be
1415  * transmitted is in a buffer. The receiver of the send is expected to
1416  * reply to the message and a buffer is provided into which IUCV moves
1417  * the reply to this message.
1418  *
1419  * Returns the result from the CP IUCV call.
1420  */
1421 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1422                           u8 flags, u32 srccls, void *buffer, size_t size,
1423                           void *answer, size_t asize, size_t *residual)
1424 {
1425         union iucv_param *parm;
1426         int rc;
1427
1428         local_bh_disable();
1429         if (cpumask_empty(&iucv_buffer_cpumask)) {
1430                 rc = -EIO;
1431                 goto out;
1432         }
1433         parm = iucv_param[smp_processor_id()];
1434         memset(parm, 0, sizeof(union iucv_param));
1435         if (flags & IUCV_IPRMDATA) {
1436                 parm->dpl.ippathid = path->pathid;
1437                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1438                 parm->dpl.iptrgcls = msg->class;
1439                 parm->dpl.ipsrccls = srccls;
1440                 parm->dpl.ipmsgtag = msg->tag;
1441                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1442                 parm->dpl.ipbfln2f = (u32) asize;
1443                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1444         } else {
1445                 parm->db.ippathid = path->pathid;
1446                 parm->db.ipflags1 = path->flags;        /* priority message */
1447                 parm->db.iptrgcls = msg->class;
1448                 parm->db.ipsrccls = srccls;
1449                 parm->db.ipmsgtag = msg->tag;
1450                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1451                 parm->db.ipbfln1f = (u32) size;
1452                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1453                 parm->db.ipbfln2f = (u32) asize;
1454         }
1455         rc = iucv_call_b2f0(IUCV_SEND, parm);
1456         if (!rc)
1457                 msg->id = parm->db.ipmsgid;
1458 out:
1459         local_bh_enable();
1460         return rc;
1461 }
1462 EXPORT_SYMBOL(iucv_message_send2way);
1463
1464 /**
1465  * iucv_path_pending
1466  * @data: Pointer to external interrupt buffer
1467  *
1468  * Process connection pending work item. Called from tasklet while holding
1469  * iucv_table_lock.
1470  */
1471 struct iucv_path_pending {
1472         u16 ippathid;
1473         u8  ipflags1;
1474         u8  iptype;
1475         u16 ipmsglim;
1476         u16 res1;
1477         u8  ipvmid[8];
1478         u8  ipuser[16];
1479         u32 res3;
1480         u8  ippollfg;
1481         u8  res4[3];
1482 } __packed;
1483
1484 static void iucv_path_pending(struct iucv_irq_data *data)
1485 {
1486         struct iucv_path_pending *ipp = (void *) data;
1487         struct iucv_handler *handler;
1488         struct iucv_path *path;
1489         char *error;
1490
1491         BUG_ON(iucv_path_table[ipp->ippathid]);
1492         /* New pathid, handler found. Create a new path struct. */
1493         error = iucv_error_no_memory;
1494         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1495         if (!path)
1496                 goto out_sever;
1497         path->pathid = ipp->ippathid;
1498         iucv_path_table[path->pathid] = path;
1499         EBCASC(ipp->ipvmid, 8);
1500
1501         /* Call registered handler until one is found that wants the path. */
1502         list_for_each_entry(handler, &iucv_handler_list, list) {
1503                 if (!handler->path_pending)
1504                         continue;
1505                 /*
1506                  * Add path to handler to allow a call to iucv_path_sever
1507                  * inside the path_pending function. If the handler returns
1508                  * an error remove the path from the handler again.
1509                  */
1510                 list_add(&path->list, &handler->paths);
1511                 path->handler = handler;
1512                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1513                         return;
1514                 list_del(&path->list);
1515                 path->handler = NULL;
1516         }
1517         /* No handler wanted the path. */
1518         iucv_path_table[path->pathid] = NULL;
1519         iucv_path_free(path);
1520         error = iucv_error_no_listener;
1521 out_sever:
1522         iucv_sever_pathid(ipp->ippathid, error);
1523 }
1524
1525 /**
1526  * iucv_path_complete
1527  * @data: Pointer to external interrupt buffer
1528  *
1529  * Process connection complete work item. Called from tasklet while holding
1530  * iucv_table_lock.
1531  */
1532 struct iucv_path_complete {
1533         u16 ippathid;
1534         u8  ipflags1;
1535         u8  iptype;
1536         u16 ipmsglim;
1537         u16 res1;
1538         u8  res2[8];
1539         u8  ipuser[16];
1540         u32 res3;
1541         u8  ippollfg;
1542         u8  res4[3];
1543 } __packed;
1544
1545 static void iucv_path_complete(struct iucv_irq_data *data)
1546 {
1547         struct iucv_path_complete *ipc = (void *) data;
1548         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1549
1550         if (path)
1551                 path->flags = ipc->ipflags1;
1552         if (path && path->handler && path->handler->path_complete)
1553                 path->handler->path_complete(path, ipc->ipuser);
1554 }
1555
1556 /**
1557  * iucv_path_severed
1558  * @data: Pointer to external interrupt buffer
1559  *
1560  * Process connection severed work item. Called from tasklet while holding
1561  * iucv_table_lock.
1562  */
1563 struct iucv_path_severed {
1564         u16 ippathid;
1565         u8  res1;
1566         u8  iptype;
1567         u32 res2;
1568         u8  res3[8];
1569         u8  ipuser[16];
1570         u32 res4;
1571         u8  ippollfg;
1572         u8  res5[3];
1573 } __packed;
1574
1575 static void iucv_path_severed(struct iucv_irq_data *data)
1576 {
1577         struct iucv_path_severed *ips = (void *) data;
1578         struct iucv_path *path = iucv_path_table[ips->ippathid];
1579
1580         if (!path || !path->handler)    /* Already severed */
1581                 return;
1582         if (path->handler->path_severed)
1583                 path->handler->path_severed(path, ips->ipuser);
1584         else {
1585                 iucv_sever_pathid(path->pathid, NULL);
1586                 iucv_path_table[path->pathid] = NULL;
1587                 list_del(&path->list);
1588                 iucv_path_free(path);
1589         }
1590 }
1591
1592 /**
1593  * iucv_path_quiesced
1594  * @data: Pointer to external interrupt buffer
1595  *
1596  * Process connection quiesced work item. Called from tasklet while holding
1597  * iucv_table_lock.
1598  */
1599 struct iucv_path_quiesced {
1600         u16 ippathid;
1601         u8  res1;
1602         u8  iptype;
1603         u32 res2;
1604         u8  res3[8];
1605         u8  ipuser[16];
1606         u32 res4;
1607         u8  ippollfg;
1608         u8  res5[3];
1609 } __packed;
1610
1611 static void iucv_path_quiesced(struct iucv_irq_data *data)
1612 {
1613         struct iucv_path_quiesced *ipq = (void *) data;
1614         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1615
1616         if (path && path->handler && path->handler->path_quiesced)
1617                 path->handler->path_quiesced(path, ipq->ipuser);
1618 }
1619
1620 /**
1621  * iucv_path_resumed
1622  * @data: Pointer to external interrupt buffer
1623  *
1624  * Process connection resumed work item. Called from tasklet while holding
1625  * iucv_table_lock.
1626  */
1627 struct iucv_path_resumed {
1628         u16 ippathid;
1629         u8  res1;
1630         u8  iptype;
1631         u32 res2;
1632         u8  res3[8];
1633         u8  ipuser[16];
1634         u32 res4;
1635         u8  ippollfg;
1636         u8  res5[3];
1637 } __packed;
1638
1639 static void iucv_path_resumed(struct iucv_irq_data *data)
1640 {
1641         struct iucv_path_resumed *ipr = (void *) data;
1642         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1643
1644         if (path && path->handler && path->handler->path_resumed)
1645                 path->handler->path_resumed(path, ipr->ipuser);
1646 }
1647
1648 /**
1649  * iucv_message_complete
1650  * @data: Pointer to external interrupt buffer
1651  *
1652  * Process message complete work item. Called from tasklet while holding
1653  * iucv_table_lock.
1654  */
1655 struct iucv_message_complete {
1656         u16 ippathid;
1657         u8  ipflags1;
1658         u8  iptype;
1659         u32 ipmsgid;
1660         u32 ipaudit;
1661         u8  iprmmsg[8];
1662         u32 ipsrccls;
1663         u32 ipmsgtag;
1664         u32 res;
1665         u32 ipbfln2f;
1666         u8  ippollfg;
1667         u8  res2[3];
1668 } __packed;
1669
1670 static void iucv_message_complete(struct iucv_irq_data *data)
1671 {
1672         struct iucv_message_complete *imc = (void *) data;
1673         struct iucv_path *path = iucv_path_table[imc->ippathid];
1674         struct iucv_message msg;
1675
1676         if (path && path->handler && path->handler->message_complete) {
1677                 msg.flags = imc->ipflags1;
1678                 msg.id = imc->ipmsgid;
1679                 msg.audit = imc->ipaudit;
1680                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1681                 msg.class = imc->ipsrccls;
1682                 msg.tag = imc->ipmsgtag;
1683                 msg.length = imc->ipbfln2f;
1684                 path->handler->message_complete(path, &msg);
1685         }
1686 }
1687
1688 /**
1689  * iucv_message_pending
1690  * @data: Pointer to external interrupt buffer
1691  *
1692  * Process message pending work item. Called from tasklet while holding
1693  * iucv_table_lock.
1694  */
1695 struct iucv_message_pending {
1696         u16 ippathid;
1697         u8  ipflags1;
1698         u8  iptype;
1699         u32 ipmsgid;
1700         u32 iptrgcls;
1701         union {
1702                 u32 iprmmsg1_u32;
1703                 u8  iprmmsg1[4];
1704         } ln1msg1;
1705         union {
1706                 u32 ipbfln1f;
1707                 u8  iprmmsg2[4];
1708         } ln1msg2;
1709         u32 res1[3];
1710         u32 ipbfln2f;
1711         u8  ippollfg;
1712         u8  res2[3];
1713 } __packed;
1714
1715 static void iucv_message_pending(struct iucv_irq_data *data)
1716 {
1717         struct iucv_message_pending *imp = (void *) data;
1718         struct iucv_path *path = iucv_path_table[imp->ippathid];
1719         struct iucv_message msg;
1720
1721         if (path && path->handler && path->handler->message_pending) {
1722                 msg.flags = imp->ipflags1;
1723                 msg.id = imp->ipmsgid;
1724                 msg.class = imp->iptrgcls;
1725                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1726                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1727                         msg.length = 8;
1728                 } else
1729                         msg.length = imp->ln1msg2.ipbfln1f;
1730                 msg.reply_size = imp->ipbfln2f;
1731                 path->handler->message_pending(path, &msg);
1732         }
1733 }
1734
1735 /**
1736  * iucv_tasklet_fn:
1737  *
1738  * This tasklet loops over the queue of irq buffers created by
1739  * iucv_external_interrupt, calls the appropriate action handler
1740  * and then frees the buffer.
1741  */
1742 static void iucv_tasklet_fn(unsigned long ignored)
1743 {
1744         typedef void iucv_irq_fn(struct iucv_irq_data *);
1745         static iucv_irq_fn *irq_fn[] = {
1746                 [0x02] = iucv_path_complete,
1747                 [0x03] = iucv_path_severed,
1748                 [0x04] = iucv_path_quiesced,
1749                 [0x05] = iucv_path_resumed,
1750                 [0x06] = iucv_message_complete,
1751                 [0x07] = iucv_message_complete,
1752                 [0x08] = iucv_message_pending,
1753                 [0x09] = iucv_message_pending,
1754         };
1755         LIST_HEAD(task_queue);
1756         struct iucv_irq_list *p, *n;
1757
1758         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1759         if (!spin_trylock(&iucv_table_lock)) {
1760                 tasklet_schedule(&iucv_tasklet);
1761                 return;
1762         }
1763         iucv_active_cpu = smp_processor_id();
1764
1765         spin_lock_irq(&iucv_queue_lock);
1766         list_splice_init(&iucv_task_queue, &task_queue);
1767         spin_unlock_irq(&iucv_queue_lock);
1768
1769         list_for_each_entry_safe(p, n, &task_queue, list) {
1770                 list_del_init(&p->list);
1771                 irq_fn[p->data.iptype](&p->data);
1772                 kfree(p);
1773         }
1774
1775         iucv_active_cpu = -1;
1776         spin_unlock(&iucv_table_lock);
1777 }
1778
1779 /**
1780  * iucv_work_fn:
1781  *
1782  * This work function loops over the queue of path pending irq blocks
1783  * created by iucv_external_interrupt, calls the appropriate action
1784  * handler and then frees the buffer.
1785  */
1786 static void iucv_work_fn(struct work_struct *work)
1787 {
1788         LIST_HEAD(work_queue);
1789         struct iucv_irq_list *p, *n;
1790
1791         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1792         spin_lock_bh(&iucv_table_lock);
1793         iucv_active_cpu = smp_processor_id();
1794
1795         spin_lock_irq(&iucv_queue_lock);
1796         list_splice_init(&iucv_work_queue, &work_queue);
1797         spin_unlock_irq(&iucv_queue_lock);
1798
1799         iucv_cleanup_queue();
1800         list_for_each_entry_safe(p, n, &work_queue, list) {
1801                 list_del_init(&p->list);
1802                 iucv_path_pending(&p->data);
1803                 kfree(p);
1804         }
1805
1806         iucv_active_cpu = -1;
1807         spin_unlock_bh(&iucv_table_lock);
1808 }
1809
1810 /**
1811  * iucv_external_interrupt
1812  * @code: irq code
1813  *
1814  * Handles external interrupts coming in from CP.
1815  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1816  */
1817 static void iucv_external_interrupt(struct ext_code ext_code,
1818                                     unsigned int param32, unsigned long param64)
1819 {
1820         struct iucv_irq_data *p;
1821         struct iucv_irq_list *work;
1822
1823         inc_irq_stat(IRQEXT_IUC);
1824         p = iucv_irq_data[smp_processor_id()];
1825         if (p->ippathid >= iucv_max_pathid) {
1826                 WARN_ON(p->ippathid >= iucv_max_pathid);
1827                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1828                 return;
1829         }
1830         BUG_ON(p->iptype  < 0x01 || p->iptype > 0x09);
1831         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1832         if (!work) {
1833                 pr_warn("iucv_external_interrupt: out of memory\n");
1834                 return;
1835         }
1836         memcpy(&work->data, p, sizeof(work->data));
1837         spin_lock(&iucv_queue_lock);
1838         if (p->iptype == 0x01) {
1839                 /* Path pending interrupt. */
1840                 list_add_tail(&work->list, &iucv_work_queue);
1841                 schedule_work(&iucv_work);
1842         } else {
1843                 /* The other interrupts. */
1844                 list_add_tail(&work->list, &iucv_task_queue);
1845                 tasklet_schedule(&iucv_tasklet);
1846         }
1847         spin_unlock(&iucv_queue_lock);
1848 }
1849
1850 static int iucv_pm_prepare(struct device *dev)
1851 {
1852         int rc = 0;
1853
1854 #ifdef CONFIG_PM_DEBUG
1855         printk(KERN_INFO "iucv_pm_prepare\n");
1856 #endif
1857         if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1858                 rc = dev->driver->pm->prepare(dev);
1859         return rc;
1860 }
1861
1862 static void iucv_pm_complete(struct device *dev)
1863 {
1864 #ifdef CONFIG_PM_DEBUG
1865         printk(KERN_INFO "iucv_pm_complete\n");
1866 #endif
1867         if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1868                 dev->driver->pm->complete(dev);
1869 }
1870
1871 /**
1872  * iucv_path_table_empty() - determine if iucv path table is empty
1873  *
1874  * Returns 0 if there are still iucv pathes defined
1875  *         1 if there are no iucv pathes defined
1876  */
1877 int iucv_path_table_empty(void)
1878 {
1879         int i;
1880
1881         for (i = 0; i < iucv_max_pathid; i++) {
1882                 if (iucv_path_table[i])
1883                         return 0;
1884         }
1885         return 1;
1886 }
1887
1888 /**
1889  * iucv_pm_freeze() - Freeze PM callback
1890  * @dev:        iucv-based device
1891  *
1892  * disable iucv interrupts
1893  * invoke callback function of the iucv-based driver
1894  * shut down iucv, if no iucv-pathes are established anymore
1895  */
1896 static int iucv_pm_freeze(struct device *dev)
1897 {
1898         int cpu;
1899         struct iucv_irq_list *p, *n;
1900         int rc = 0;
1901
1902 #ifdef CONFIG_PM_DEBUG
1903         printk(KERN_WARNING "iucv_pm_freeze\n");
1904 #endif
1905         if (iucv_pm_state != IUCV_PM_FREEZING) {
1906                 for_each_cpu(cpu, &iucv_irq_cpumask)
1907                         smp_call_function_single(cpu, iucv_block_cpu_almost,
1908                                                  NULL, 1);
1909                 cancel_work_sync(&iucv_work);
1910                 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1911                         list_del_init(&p->list);
1912                         iucv_sever_pathid(p->data.ippathid,
1913                                           iucv_error_no_listener);
1914                         kfree(p);
1915                 }
1916         }
1917         iucv_pm_state = IUCV_PM_FREEZING;
1918         if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1919                 rc = dev->driver->pm->freeze(dev);
1920         if (iucv_path_table_empty())
1921                 iucv_disable();
1922         return rc;
1923 }
1924
1925 /**
1926  * iucv_pm_thaw() - Thaw PM callback
1927  * @dev:        iucv-based device
1928  *
1929  * make iucv ready for use again: allocate path table, declare interrupt buffers
1930  *                                and enable iucv interrupts
1931  * invoke callback function of the iucv-based driver
1932  */
1933 static int iucv_pm_thaw(struct device *dev)
1934 {
1935         int rc = 0;
1936
1937 #ifdef CONFIG_PM_DEBUG
1938         printk(KERN_WARNING "iucv_pm_thaw\n");
1939 #endif
1940         iucv_pm_state = IUCV_PM_THAWING;
1941         if (!iucv_path_table) {
1942                 rc = iucv_enable();
1943                 if (rc)
1944                         goto out;
1945         }
1946         if (cpumask_empty(&iucv_irq_cpumask)) {
1947                 if (iucv_nonsmp_handler)
1948                         /* enable interrupts on one cpu */
1949                         iucv_allow_cpu(NULL);
1950                 else
1951                         /* enable interrupts on all cpus */
1952                         iucv_setmask_mp();
1953         }
1954         if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1955                 rc = dev->driver->pm->thaw(dev);
1956 out:
1957         return rc;
1958 }
1959
1960 /**
1961  * iucv_pm_restore() - Restore PM callback
1962  * @dev:        iucv-based device
1963  *
1964  * make iucv ready for use again: allocate path table, declare interrupt buffers
1965  *                                and enable iucv interrupts
1966  * invoke callback function of the iucv-based driver
1967  */
1968 static int iucv_pm_restore(struct device *dev)
1969 {
1970         int rc = 0;
1971
1972 #ifdef CONFIG_PM_DEBUG
1973         printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1974 #endif
1975         if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1976                 pr_warn("Suspending Linux did not completely close all IUCV connections\n");
1977         iucv_pm_state = IUCV_PM_RESTORING;
1978         if (cpumask_empty(&iucv_irq_cpumask)) {
1979                 rc = iucv_query_maxconn();
1980                 rc = iucv_enable();
1981                 if (rc)
1982                         goto out;
1983         }
1984         if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1985                 rc = dev->driver->pm->restore(dev);
1986 out:
1987         return rc;
1988 }
1989
1990 struct iucv_interface iucv_if = {
1991         .message_receive = iucv_message_receive,
1992         .__message_receive = __iucv_message_receive,
1993         .message_reply = iucv_message_reply,
1994         .message_reject = iucv_message_reject,
1995         .message_send = iucv_message_send,
1996         .__message_send = __iucv_message_send,
1997         .message_send2way = iucv_message_send2way,
1998         .message_purge = iucv_message_purge,
1999         .path_accept = iucv_path_accept,
2000         .path_connect = iucv_path_connect,
2001         .path_quiesce = iucv_path_quiesce,
2002         .path_resume = iucv_path_resume,
2003         .path_sever = iucv_path_sever,
2004         .iucv_register = iucv_register,
2005         .iucv_unregister = iucv_unregister,
2006         .bus = NULL,
2007         .root = NULL,
2008 };
2009 EXPORT_SYMBOL(iucv_if);
2010
2011 static enum cpuhp_state iucv_online;
2012 /**
2013  * iucv_init
2014  *
2015  * Allocates and initializes various data structures.
2016  */
2017 static int __init iucv_init(void)
2018 {
2019         int rc;
2020
2021         if (!MACHINE_IS_VM) {
2022                 rc = -EPROTONOSUPPORT;
2023                 goto out;
2024         }
2025         ctl_set_bit(0, 1);
2026         rc = iucv_query_maxconn();
2027         if (rc)
2028                 goto out_ctl;
2029         rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2030         if (rc)
2031                 goto out_ctl;
2032         iucv_root = root_device_register("iucv");
2033         if (IS_ERR(iucv_root)) {
2034                 rc = PTR_ERR(iucv_root);
2035                 goto out_int;
2036         }
2037
2038         rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
2039                                iucv_cpu_prepare, iucv_cpu_dead);
2040         if (rc)
2041                 goto out_dev;
2042         rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
2043                                iucv_cpu_online, iucv_cpu_down_prep);
2044         if (rc < 0)
2045                 goto out_prep;
2046         iucv_online = rc;
2047
2048         rc = register_reboot_notifier(&iucv_reboot_notifier);
2049         if (rc)
2050                 goto out_remove_hp;
2051         ASCEBC(iucv_error_no_listener, 16);
2052         ASCEBC(iucv_error_no_memory, 16);
2053         ASCEBC(iucv_error_pathid, 16);
2054         iucv_available = 1;
2055         rc = bus_register(&iucv_bus);
2056         if (rc)
2057                 goto out_reboot;
2058         iucv_if.root = iucv_root;
2059         iucv_if.bus = &iucv_bus;
2060         return 0;
2061
2062 out_reboot:
2063         unregister_reboot_notifier(&iucv_reboot_notifier);
2064 out_remove_hp:
2065         cpuhp_remove_state(iucv_online);
2066 out_prep:
2067         cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
2068 out_dev:
2069         root_device_unregister(iucv_root);
2070 out_int:
2071         unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2072 out_ctl:
2073         ctl_clear_bit(0, 1);
2074 out:
2075         return rc;
2076 }
2077
2078 /**
2079  * iucv_exit
2080  *
2081  * Frees everything allocated from iucv_init.
2082  */
2083 static void __exit iucv_exit(void)
2084 {
2085         struct iucv_irq_list *p, *n;
2086
2087         spin_lock_irq(&iucv_queue_lock);
2088         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2089                 kfree(p);
2090         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2091                 kfree(p);
2092         spin_unlock_irq(&iucv_queue_lock);
2093         unregister_reboot_notifier(&iucv_reboot_notifier);
2094
2095         cpuhp_remove_state_nocalls(iucv_online);
2096         cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
2097         root_device_unregister(iucv_root);
2098         bus_unregister(&iucv_bus);
2099         unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2100 }
2101
2102 subsys_initcall(iucv_init);
2103 module_exit(iucv_exit);
2104
2105 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert ([email protected])");
2106 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2107 MODULE_LICENSE("GPL");