net/iucv/iucv.c

   1 /*
   2  * IUCV base infrastructure.
   3  *
   4  * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
   5  * Author(s):
   6  *    Original source:
   7  *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
   8  *      Xenia Tkatschow (xenia@us.ibm.com)
   9  *    2Gb awareness and general cleanup:
  10  *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
  11  *    Rewritten for af_iucv:
  12  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
  13  *
  14  * Documentation used:
  15  *    The original source
  16  *    CP Programming Service, IBM document # SC24-5760
  17  *
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation; either version 2, or (at your option)
  21  * any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kernel.h>
  37 #include <linux/slab.h>
  38 #include <linux/init.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/list.h>
  41 #include <linux/errno.h>
  42 #include <linux/err.h>
  43 #include <linux/device.h>
  44 #include <linux/cpu.h>
  45 #include <net/iucv/iucv.h>
  46 #include <asm/atomic.h>
  47 #include <asm/ebcdic.h>
  48 #include <asm/io.h>
  49 #include <asm/s390_ext.h>
  50 #include <asm/s390_rdev.h>
  51 #include <asm/smp.h>
  52
  53 /*
  54  * FLAGS:
  55  * All flags are defined in the field IPFLAGS1 of each function
  56  * and can be found in CP Programming Services.
  57  * IPSRCCLS - Indicates you have specified a source class.
  58  * IPTRGCLS - Indicates you have specified a target class.
  59  * IPFGPID  - Indicates you have specified a pathid.
  60  * IPFGMID  - Indicates you have specified a message ID.
  61  * IPNORPY  - Indicates a one-way message. No reply expected.
  62  * IPALL    - Indicates that all paths are affected.
  63  */
  64 #define IUCV_IPSRCCLS   0x01
  65 #define IUCV_IPTRGCLS   0x01
  66 #define IUCV_IPFGPID    0x02
  67 #define IUCV_IPFGMID    0x04
  68 #define IUCV_IPNORPY    0x10
  69 #define IUCV_IPALL      0x80
  70
  71 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
  72 {
  73         return 0;
  74 }
  75
  76 struct bus_type iucv_bus = {
  77         .name = "iucv",
  78         .match = iucv_bus_match,
  79 };
  80 EXPORT_SYMBOL(iucv_bus);
  81
  82 struct device *iucv_root;
  83 EXPORT_SYMBOL(iucv_root);
  84
  85 static int iucv_available;
  86
  87 /* General IUCV interrupt structure */
  88 struct iucv_irq_data {
  89         u16 ippathid;
  90         u8  ipflags1;
  91         u8  iptype;
  92         u32 res2[8];
  93 };
  94
  95 struct iucv_irq_list {
  96         struct list_head list;
  97         struct iucv_irq_data data;
  98 };
  99
 100 static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
 101 static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
 102 static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
 103
 104 /*
 105  * Queue of interrupt buffers lock for delivery via the tasklet
 106  * (fast but can't call smp_call_function).
 107  */
 108 static LIST_HEAD(iucv_task_queue);
 109
 110 /*
 111  * The tasklet for fast delivery of iucv interrupts.
 112  */
 113 static void iucv_tasklet_fn(unsigned long);
 114 static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
 115
 116 /*
 117  * Queue of interrupt buffers for delivery via a work queue
 118  * (slower but can call smp_call_function).
 119  */
 120 static LIST_HEAD(iucv_work_queue);
 121
 122 /*
 123  * The work element to deliver path pending interrupts.
 124  */
 125 static void iucv_work_fn(struct work_struct *work);
 126 static DECLARE_WORK(iucv_work, iucv_work_fn);
 127
 128 /*
 129  * Spinlock protecting task and work queue.
 130  */
 131 static DEFINE_SPINLOCK(iucv_queue_lock);
 132
 133 enum iucv_command_codes {
 134         IUCV_QUERY = 0,
 135         IUCV_RETRIEVE_BUFFER = 2,
 136         IUCV_SEND = 4,
 137         IUCV_RECEIVE = 5,
 138         IUCV_REPLY = 6,
 139         IUCV_REJECT = 8,
 140         IUCV_PURGE = 9,
 141         IUCV_ACCEPT = 10,
 142         IUCV_CONNECT = 11,
 143         IUCV_DECLARE_BUFFER = 12,
 144         IUCV_QUIESCE = 13,
 145         IUCV_RESUME = 14,
 146         IUCV_SEVER = 15,
 147         IUCV_SETMASK = 16,
 148 };
 149
 150 /*
 151  * Error messages that are used with the iucv_sever function. They get
 152  * converted to EBCDIC.
 153  */
 154 static char iucv_error_no_listener[16] = "NO LISTENER";
 155 static char iucv_error_no_memory[16] = "NO MEMORY";
 156 static char iucv_error_pathid[16] = "INVALID PATHID";
 157
 158 /*
 159  * iucv_handler_list: List of registered handlers.
 160  */
 161 static LIST_HEAD(iucv_handler_list);
 162
 163 /*
 164  * iucv_path_table: an array of iucv_path structures.
 165  */
 166 static struct iucv_path **iucv_path_table;
 167 static unsigned long iucv_max_pathid;
 168
 169 /*
 170  * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
 171  */
 172 static DEFINE_SPINLOCK(iucv_table_lock);
 173
 174 /*
 175  * iucv_active_cpu: contains the number of the cpu executing the tasklet
 176  * or the work handler. Needed for iucv_path_sever called from tasklet.
 177  */
 178 static int iucv_active_cpu = -1;
 179
 180 /*
 181  * Mutex and wait queue for iucv_register/iucv_unregister.
 182  */
 183 static DEFINE_MUTEX(iucv_register_mutex);
 184
 185 /*
 186  * Counter for number of non-smp capable handlers.
 187  */
 188 static int iucv_nonsmp_handler;
 189
 190 /*
 191  * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
 192  * iucv_path_quiesce and iucv_path_sever.
 193  */
 194 struct iucv_cmd_control {
 195         u16 ippathid;
 196         u8  ipflags1;
 197         u8  iprcode;
 198         u16 ipmsglim;
 199         u16 res1;
 200         u8  ipvmid[8];
 201         u8  ipuser[16];
 202         u8  iptarget[8];
 203 } __attribute__ ((packed,aligned(8)));
 204
 205 /*
 206  * Data in parameter list iucv structure. Used by iucv_message_send,
 207  * iucv_message_send2way and iucv_message_reply.
 208  */
 209 struct iucv_cmd_dpl {
 210         u16 ippathid;
 211         u8  ipflags1;
 212         u8  iprcode;
 213         u32 ipmsgid;
 214         u32 iptrgcls;
 215         u8  iprmmsg[8];
 216         u32 ipsrccls;
 217         u32 ipmsgtag;
 218         u32 ipbfadr2;
 219         u32 ipbfln2f;
 220         u32 res;
 221 } __attribute__ ((packed,aligned(8)));
 222
 223 /*
 224  * Data in buffer iucv structure. Used by iucv_message_receive,
 225  * iucv_message_reject, iucv_message_send, iucv_message_send2way
 226  * and iucv_declare_cpu.
 227  */
 228 struct iucv_cmd_db {
 229         u16 ippathid;
 230         u8  ipflags1;
 231         u8  iprcode;
 232         u32 ipmsgid;
 233         u32 iptrgcls;
 234         u32 ipbfadr1;
 235         u32 ipbfln1f;
 236         u32 ipsrccls;
 237         u32 ipmsgtag;
 238         u32 ipbfadr2;
 239         u32 ipbfln2f;
 240         u32 res;
 241 } __attribute__ ((packed,aligned(8)));
 242
 243 /*
 244  * Purge message iucv structure. Used by iucv_message_purge.
 245  */
 246 struct iucv_cmd_purge {
 247         u16 ippathid;
 248         u8  ipflags1;
 249         u8  iprcode;
 250         u32 ipmsgid;
 251         u8  ipaudit[3];
 252         u8  res1[5];
 253         u32 res2;
 254         u32 ipsrccls;
 255         u32 ipmsgtag;
 256         u32 res3[3];
 257 } __attribute__ ((packed,aligned(8)));
 258
 259 /*
 260  * Set mask iucv structure. Used by iucv_enable_cpu.
 261  */
 262 struct iucv_cmd_set_mask {
 263         u8  ipmask;
 264         u8  res1[2];
 265         u8  iprcode;
 266         u32 res2[9];
 267 } __attribute__ ((packed,aligned(8)));
 268
 269 union iucv_param {
 270         struct iucv_cmd_control ctrl;
 271         struct iucv_cmd_dpl dpl;
 272         struct iucv_cmd_db db;
 273         struct iucv_cmd_purge purge;
 274         struct iucv_cmd_set_mask set_mask;
 275 };
 276
 277 /*
 278  * Anchor for per-cpu IUCV command parameter block.
 279  */
 280 static union iucv_param *iucv_param[NR_CPUS];
 281
 282 /**
 283  * iucv_call_b2f0
 284  * @code: identifier of IUCV call to CP.
 285  * @parm: pointer to a struct iucv_parm block
 286  *
 287  * Calls CP to execute IUCV commands.
 288  *
 289  * Returns the result of the CP IUCV call.
 290  */
 291 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
 292 {
 293         register unsigned long reg0 asm ("0");
 294         register unsigned long reg1 asm ("1");
 295         int ccode;
 296
 297         reg0 = command;
 298         reg1 = virt_to_phys(parm);
 299         asm volatile(
 300                 "       .long 0xb2f01000\n"
 301                 "       ipm     %0\n"
 302                 "       srl     %0,28\n"
 303                 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
 304                 :  "m" (*parm) : "cc");
 305         return (ccode == 1) ? parm->ctrl.iprcode : ccode;
 306 }
 307
 308 /**
 309  * iucv_query_maxconn
 310  *
 311  * Determines the maximum number of connections that may be established.
 312  *
 313  * Returns the maximum number of connections or -EPERM is IUCV is not
 314  * available.
 315  */
 316 static int iucv_query_maxconn(void)
 317 {
 318         register unsigned long reg0 asm ("0");
 319         register unsigned long reg1 asm ("1");
 320         void *param;
 321         int ccode;
 322
 323         param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
 324         if (!param)
 325                 return -ENOMEM;
 326         reg0 = IUCV_QUERY;
 327         reg1 = (unsigned long) param;
 328         asm volatile (
 329                 "       .long   0xb2f01000\n"
 330                 "       ipm     %0\n"
 331                 "       srl     %0,28\n"
 332                 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
 333         if (ccode == 0)
 334                 iucv_max_pathid = reg0;
 335         kfree(param);
 336         return ccode ? -EPERM : 0;
 337 }
 338
 339 /**
 340  * iucv_allow_cpu
 341  * @data: unused
 342  *
 343  * Allow iucv interrupts on this cpu.
 344  */
 345 static void iucv_allow_cpu(void *data)
 346 {
 347         int cpu = smp_processor_id();
 348         union iucv_param *parm;
 349
 350         /*
 351          * Enable all iucv interrupts.
 352          * ipmask contains bits for the different interrupts
 353          *      0x80 - Flag to allow nonpriority message pending interrupts
 354          *      0x40 - Flag to allow priority message pending interrupts
 355          *      0x20 - Flag to allow nonpriority message completion interrupts
 356          *      0x10 - Flag to allow priority message completion interrupts
 357          *      0x08 - Flag to allow IUCV control interrupts
 358          */
 359         parm = iucv_param[cpu];
 360         memset(parm, 0, sizeof(union iucv_param));
 361         parm->set_mask.ipmask = 0xf8;
 362         iucv_call_b2f0(IUCV_SETMASK, parm);
 363
 364         /* Set indication that iucv interrupts are allowed for this cpu. */
 365         cpu_set(cpu, iucv_irq_cpumask);
 366 }
 367
 368 /**
 369  * iucv_block_cpu
 370  * @data: unused
 371  *
 372  * Block iucv interrupts on this cpu.
 373  */
 374 static void iucv_block_cpu(void *data)
 375 {
 376         int cpu = smp_processor_id();
 377         union iucv_param *parm;
 378
 379         /* Disable all iucv interrupts. */
 380         parm = iucv_param[cpu];
 381         memset(parm, 0, sizeof(union iucv_param));
 382         iucv_call_b2f0(IUCV_SETMASK, parm);
 383
 384         /* Clear indication that iucv interrupts are allowed for this cpu. */
 385         cpu_clear(cpu, iucv_irq_cpumask);
 386 }
 387
 388 /**
 389  * iucv_declare_cpu
 390  * @data: unused
 391  *
 392  * Declare a interrupt buffer on this cpu.
 393  */
 394 static void iucv_declare_cpu(void *data)
 395 {
 396         int cpu = smp_processor_id();
 397         union iucv_param *parm;
 398         int rc;
 399
 400         if (cpu_isset(cpu, iucv_buffer_cpumask))
 401                 return;
 402
 403         /* Declare interrupt buffer. */
 404         parm = iucv_param[cpu];
 405         memset(parm, 0, sizeof(union iucv_param));
 406         parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
 407         rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
 408         if (rc) {
 409                 char *err = "Unknown";
 410                 switch (rc) {
 411                 case 0x03:
 412                         err = "Directory error";
 413                         break;
 414                 case 0x0a:
 415                         err = "Invalid length";
 416                         break;
 417                 case 0x13:
 418                         err = "Buffer already exists";
 419                         break;
 420                 case 0x3e:
 421                         err = "Buffer overlap";
 422                         break;
 423                 case 0x5c:
 424                         err = "Paging or storage error";
 425                         break;
 426                 }
 427                 printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
 428                        "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
 429                 return;
 430         }
 431
 432         /* Set indication that an iucv buffer exists for this cpu. */
 433         cpu_set(cpu, iucv_buffer_cpumask);
 434
 435         if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
 436                 /* Enable iucv interrupts on this cpu. */
 437                 iucv_allow_cpu(NULL);
 438         else
 439                 /* Disable iucv interrupts on this cpu. */
 440                 iucv_block_cpu(NULL);
 441 }
 442
 443 /**
 444  * iucv_retrieve_cpu
 445  * @data: unused
 446  *
 447  * Retrieve interrupt buffer on this cpu.
 448  */
 449 static void iucv_retrieve_cpu(void *data)
 450 {
 451         int cpu = smp_processor_id();
 452         union iucv_param *parm;
 453
 454         if (!cpu_isset(cpu, iucv_buffer_cpumask))
 455                 return;
 456
 457         /* Block iucv interrupts. */
 458         iucv_block_cpu(NULL);
 459
 460         /* Retrieve interrupt buffer. */
 461         parm = iucv_param[cpu];
 462         iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
 463
 464         /* Clear indication that an iucv buffer exists for this cpu. */
 465         cpu_clear(cpu, iucv_buffer_cpumask);
 466 }
 467
 468 /**
 469  * iucv_setmask_smp
 470  *
 471  * Allow iucv interrupts on all cpus.
 472  */
 473 static void iucv_setmask_mp(void)
 474 {
 475         int cpu;
 476
 477         get_online_cpus();
 478         for_each_online_cpu(cpu)
 479                 /* Enable all cpus with a declared buffer. */
 480                 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
 481                     !cpu_isset(cpu, iucv_irq_cpumask))
 482                         smp_call_function_single(cpu, iucv_allow_cpu,
 483                                                  NULL, 1);
 484         put_online_cpus();
 485 }
 486
 487 /**
 488  * iucv_setmask_up
 489  *
 490  * Allow iucv interrupts on a single cpu.
 491  */
 492 static void iucv_setmask_up(void)
 493 {
 494         cpumask_t cpumask;
 495         int cpu;
 496
 497         /* Disable all cpu but the first in cpu_irq_cpumask. */
 498         cpumask = iucv_irq_cpumask;
 499         cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
 500         for_each_cpu_mask_nr(cpu, cpumask)
 501                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
 502 }
 503
 504 /**
 505  * iucv_enable
 506  *
 507  * This function makes iucv ready for use. It allocates the pathid
 508  * table, declares an iucv interrupt buffer and enables the iucv
 509  * interrupts. Called when the first user has registered an iucv
 510  * handler.
 511  */
 512 static int iucv_enable(void)
 513 {
 514         size_t alloc_size;
 515         int cpu, rc;
 516
 517         rc = -ENOMEM;
 518         alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
 519         iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
 520         if (!iucv_path_table)
 521                 goto out;
 522         /* Declare per cpu buffers. */
 523         rc = -EIO;
 524         get_online_cpus();
 525         for_each_online_cpu(cpu)
 526                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
 527         if (cpus_empty(iucv_buffer_cpumask))
 528                 /* No cpu could declare an iucv buffer. */
 529                 goto out_path;
 530         put_online_cpus();
 531         return 0;
 532
 533 out_path:
 534         put_online_cpus();
 535         kfree(iucv_path_table);
 536 out:
 537         return rc;
 538 }
 539
 540 /**
 541  * iucv_disable
 542  *
 543  * This function shuts down iucv. It disables iucv interrupts, retrieves
 544  * the iucv interrupt buffer and frees the pathid table. Called after the
 545  * last user unregister its iucv handler.
 546  */
 547 static void iucv_disable(void)
 548 {
 549         get_online_cpus();
 550         on_each_cpu(iucv_retrieve_cpu, NULL, 1);
 551         put_online_cpus();
 552         kfree(iucv_path_table);
 553 }
 554
 555 static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
 556                                      unsigned long action, void *hcpu)
 557 {
 558         cpumask_t cpumask;
 559         long cpu = (long) hcpu;
 560
 561         switch (action) {
 562         case CPU_UP_PREPARE:
 563         case CPU_UP_PREPARE_FROZEN:
 564                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
 565                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 566                 if (!iucv_irq_data[cpu])
 567                         return NOTIFY_BAD;
 568                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
 569                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 570                 if (!iucv_param[cpu]) {
 571                         kfree(iucv_irq_data[cpu]);
 572                         iucv_irq_data[cpu] = NULL;
 573                         return NOTIFY_BAD;
 574                 }
 575                 break;
 576         case CPU_UP_CANCELED:
 577         case CPU_UP_CANCELED_FROZEN:
 578         case CPU_DEAD:
 579         case CPU_DEAD_FROZEN:
 580                 kfree(iucv_param[cpu]);
 581                 iucv_param[cpu] = NULL;
 582                 kfree(iucv_irq_data[cpu]);
 583                 iucv_irq_data[cpu] = NULL;
 584                 break;
 585         case CPU_ONLINE:
 586         case CPU_ONLINE_FROZEN:
 587         case CPU_DOWN_FAILED:
 588         case CPU_DOWN_FAILED_FROZEN:
 589                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
 590                 break;
 591         case CPU_DOWN_PREPARE:
 592         case CPU_DOWN_PREPARE_FROZEN:
 593                 cpumask = iucv_buffer_cpumask;
 594                 cpu_clear(cpu, cpumask);
 595                 if (cpus_empty(cpumask))
 596                         /* Can't offline last IUCV enabled cpu. */
 597                         return NOTIFY_BAD;
 598                 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
 599                 if (cpus_empty(iucv_irq_cpumask))
 600                         smp_call_function_single(first_cpu(iucv_buffer_cpumask),
 601                                                  iucv_allow_cpu, NULL, 1);
 602                 break;
 603         }
 604         return NOTIFY_OK;
 605 }
 606
 607 static struct notifier_block __refdata iucv_cpu_notifier = {
 608         .notifier_call = iucv_cpu_notify,
 609 };
 610
 611 /**
 612  * iucv_sever_pathid
 613  * @pathid: path identification number.
 614  * @userdata: 16-bytes of user data.
 615  *
 616  * Sever an iucv path to free up the pathid. Used internally.
 617  */
 618 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
 619 {
 620         union iucv_param *parm;
 621
 622         parm = iucv_param[smp_processor_id()];
 623         memset(parm, 0, sizeof(union iucv_param));
 624         if (userdata)
 625                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 626         parm->ctrl.ippathid = pathid;
 627         return iucv_call_b2f0(IUCV_SEVER, parm);
 628 }
 629
 630 /**
 631  * __iucv_cleanup_queue
 632  * @dummy: unused dummy argument
 633  *
 634  * Nop function called via smp_call_function to force work items from
 635  * pending external iucv interrupts to the work queue.
 636  */
 637 static void __iucv_cleanup_queue(void *dummy)
 638 {
 639 }
 640
 641 /**
 642  * iucv_cleanup_queue
 643  *
 644  * Function called after a path has been severed to find all remaining
 645  * work items for the now stale pathid. The caller needs to hold the
 646  * iucv_table_lock.
 647  */
 648 static void iucv_cleanup_queue(void)
 649 {
 650         struct iucv_irq_list *p, *n;
 651
 652         /*
 653          * When a path is severed, the pathid can be reused immediatly
 654          * on a iucv connect or a connection pending interrupt. Remove
 655          * all entries from the task queue that refer to a stale pathid
 656          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
 657          * or deliver the connection pending interrupt. To get all the
 658          * pending interrupts force them to the work queue by calling
 659          * an empty function on all cpus.
 660          */
 661         smp_call_function(__iucv_cleanup_queue, NULL, 1);
 662         spin_lock_irq(&iucv_queue_lock);
 663         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
 664                 /* Remove stale work items from the task queue. */
 665                 if (iucv_path_table[p->data.ippathid] == NULL) {
 666                         list_del(&p->list);
 667                         kfree(p);
 668                 }
 669         }
 670         spin_unlock_irq(&iucv_queue_lock);
 671 }
 672
 673 /**
 674  * iucv_register:
 675  * @handler: address of iucv handler structure
 676  * @smp: != 0 indicates that the handler can deal with out of order messages
 677  *
 678  * Registers a driver with IUCV.
 679  *
 680  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 681  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 682  */
 683 int iucv_register(struct iucv_handler *handler, int smp)
 684 {
 685         int rc;
 686
 687         if (!iucv_available)
 688                 return -ENOSYS;
 689         mutex_lock(&iucv_register_mutex);
 690         if (!smp)
 691                 iucv_nonsmp_handler++;
 692         if (list_empty(&iucv_handler_list)) {
 693                 rc = iucv_enable();
 694                 if (rc)
 695                         goto out_mutex;
 696         } else if (!smp && iucv_nonsmp_handler == 1)
 697                 iucv_setmask_up();
 698         INIT_LIST_HEAD(&handler->paths);
 699
 700         spin_lock_bh(&iucv_table_lock);
 701         list_add_tail(&handler->list, &iucv_handler_list);
 702         spin_unlock_bh(&iucv_table_lock);
 703         rc = 0;
 704 out_mutex:
 705         mutex_unlock(&iucv_register_mutex);
 706         return rc;
 707 }
 708 EXPORT_SYMBOL(iucv_register);
 709
 710 /**
 711  * iucv_unregister
 712  * @handler:  address of iucv handler structure
 713  * @smp: != 0 indicates that the handler can deal with out of order messages
 714  *
 715  * Unregister driver from IUCV.
 716  */
 717 void iucv_unregister(struct iucv_handler *handler, int smp)
 718 {
 719         struct iucv_path *p, *n;
 720
 721         mutex_lock(&iucv_register_mutex);
 722         spin_lock_bh(&iucv_table_lock);
 723         /* Remove handler from the iucv_handler_list. */
 724         list_del_init(&handler->list);
 725         /* Sever all pathids still refering to the handler. */
 726         list_for_each_entry_safe(p, n, &handler->paths, list) {
 727                 iucv_sever_pathid(p->pathid, NULL);
 728                 iucv_path_table[p->pathid] = NULL;
 729                 list_del(&p->list);
 730                 iucv_path_free(p);
 731         }
 732         spin_unlock_bh(&iucv_table_lock);
 733         if (!smp)
 734                 iucv_nonsmp_handler--;
 735         if (list_empty(&iucv_handler_list))
 736                 iucv_disable();
 737         else if (!smp && iucv_nonsmp_handler == 0)
 738                 iucv_setmask_mp();
 739         mutex_unlock(&iucv_register_mutex);
 740 }
 741 EXPORT_SYMBOL(iucv_unregister);
 742
 743 /**
 744  * iucv_path_accept
 745  * @path: address of iucv path structure
 746  * @handler: address of iucv handler structure
 747  * @userdata: 16 bytes of data reflected to the communication partner
 748  * @private: private data passed to interrupt handlers for this path
 749  *
 750  * This function is issued after the user received a connection pending
 751  * external interrupt and now wishes to complete the IUCV communication path.
 752  *
 753  * Returns the result of the CP IUCV call.
 754  */
 755 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 756                      u8 userdata[16], void *private)
 757 {
 758         union iucv_param *parm;
 759         int rc;
 760
 761         local_bh_disable();
 762         /* Prepare parameter block. */
 763         parm = iucv_param[smp_processor_id()];
 764         memset(parm, 0, sizeof(union iucv_param));
 765         parm->ctrl.ippathid = path->pathid;
 766         parm->ctrl.ipmsglim = path->msglim;
 767         if (userdata)
 768                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 769         parm->ctrl.ipflags1 = path->flags;
 770
 771         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
 772         if (!rc) {
 773                 path->private = private;
 774                 path->msglim = parm->ctrl.ipmsglim;
 775                 path->flags = parm->ctrl.ipflags1;
 776         }
 777         local_bh_enable();
 778         return rc;
 779 }
 780 EXPORT_SYMBOL(iucv_path_accept);
 781
 782 /**
 783  * iucv_path_connect
 784  * @path: address of iucv path structure
 785  * @handler: address of iucv handler structure
 786  * @userid: 8-byte user identification
 787  * @system: 8-byte target system identification
 788  * @userdata: 16 bytes of data reflected to the communication partner
 789  * @private: private data passed to interrupt handlers for this path
 790  *
 791  * This function establishes an IUCV path. Although the connect may complete
 792  * successfully, you are not able to use the path until you receive an IUCV
 793  * Connection Complete external interrupt.
 794  *
 795  * Returns the result of the CP IUCV call.
 796  */
 797 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 798                       u8 userid[8], u8 system[8], u8 userdata[16],
 799                       void *private)
 800 {
 801         union iucv_param *parm;
 802         int rc;
 803
 804         spin_lock_bh(&iucv_table_lock);
 805         iucv_cleanup_queue();
 806         parm = iucv_param[smp_processor_id()];
 807         memset(parm, 0, sizeof(union iucv_param));
 808         parm->ctrl.ipmsglim = path->msglim;
 809         parm->ctrl.ipflags1 = path->flags;
 810         if (userid) {
 811                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
 812                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 813                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 814         }
 815         if (system) {
 816                 memcpy(parm->ctrl.iptarget, system,
 817                        sizeof(parm->ctrl.iptarget));
 818                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 819                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 820         }
 821         if (userdata)
 822                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 823
 824         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
 825         if (!rc) {
 826                 if (parm->ctrl.ippathid < iucv_max_pathid) {
 827                         path->pathid = parm->ctrl.ippathid;
 828                         path->msglim = parm->ctrl.ipmsglim;
 829                         path->flags = parm->ctrl.ipflags1;
 830                         path->handler = handler;
 831                         path->private = private;
 832                         list_add_tail(&path->list, &handler->paths);
 833                         iucv_path_table[path->pathid] = path;
 834                 } else {
 835                         iucv_sever_pathid(parm->ctrl.ippathid,
 836                                           iucv_error_pathid);
 837                         rc = -EIO;
 838                 }
 839         }
 840         spin_unlock_bh(&iucv_table_lock);
 841         return rc;
 842 }
 843 EXPORT_SYMBOL(iucv_path_connect);
 844
 845 /**
 846  * iucv_path_quiesce:
 847  * @path: address of iucv path structure
 848  * @userdata: 16 bytes of data reflected to the communication partner
 849  *
 850  * This function temporarily suspends incoming messages on an IUCV path.
 851  * You can later reactivate the path by invoking the iucv_resume function.
 852  *
 853  * Returns the result from the CP IUCV call.
 854  */
 855 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
 856 {
 857         union iucv_param *parm;
 858         int rc;
 859
 860         local_bh_disable();
 861         parm = iucv_param[smp_processor_id()];
 862         memset(parm, 0, sizeof(union iucv_param));
 863         if (userdata)
 864                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 865         parm->ctrl.ippathid = path->pathid;
 866         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
 867         local_bh_enable();
 868         return rc;
 869 }
 870 EXPORT_SYMBOL(iucv_path_quiesce);
 871
 872 /**
 873  * iucv_path_resume:
 874  * @path: address of iucv path structure
 875  * @userdata: 16 bytes of data reflected to the communication partner
 876  *
 877  * This function resumes incoming messages on an IUCV path that has
 878  * been stopped with iucv_path_quiesce.
 879  *
 880  * Returns the result from the CP IUCV call.
 881  */
 882 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
 883 {
 884         union iucv_param *parm;
 885         int rc;
 886
 887         local_bh_disable();
 888         parm = iucv_param[smp_processor_id()];
 889         memset(parm, 0, sizeof(union iucv_param));
 890         if (userdata)
 891                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 892         parm->ctrl.ippathid = path->pathid;
 893         rc = iucv_call_b2f0(IUCV_RESUME, parm);
 894         local_bh_enable();
 895         return rc;
 896 }
 897
 898 /**
 899  * iucv_path_sever
 900  * @path: address of iucv path structure
 901  * @userdata: 16 bytes of data reflected to the communication partner
 902  *
 903  * This function terminates an IUCV path.
 904  *
 905  * Returns the result from the CP IUCV call.
 906  */
 907 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
 908 {
 909         int rc;
 910
 911         preempt_disable();
 912         if (iucv_active_cpu != smp_processor_id())
 913                 spin_lock_bh(&iucv_table_lock);
 914         rc = iucv_sever_pathid(path->pathid, userdata);
 915         if (!rc) {
 916                 iucv_path_table[path->pathid] = NULL;
 917                 list_del_init(&path->list);
 918         }
 919         if (iucv_active_cpu != smp_processor_id())
 920                 spin_unlock_bh(&iucv_table_lock);
 921         preempt_enable();
 922         return rc;
 923 }
 924 EXPORT_SYMBOL(iucv_path_sever);
 925
 926 /**
 927  * iucv_message_purge
 928  * @path: address of iucv path structure
 929  * @msg: address of iucv msg structure
 930  * @srccls: source class of message
 931  *
 932  * Cancels a message you have sent.
 933  *
 934  * Returns the result from the CP IUCV call.
 935  */
 936 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
 937                        u32 srccls)
 938 {
 939         union iucv_param *parm;
 940         int rc;
 941
 942         local_bh_disable();
 943         parm = iucv_param[smp_processor_id()];
 944         memset(parm, 0, sizeof(union iucv_param));
 945         parm->purge.ippathid = path->pathid;
 946         parm->purge.ipmsgid = msg->id;
 947         parm->purge.ipsrccls = srccls;
 948         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
 949         rc = iucv_call_b2f0(IUCV_PURGE, parm);
 950         if (!rc) {
 951                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
 952                 msg->tag = parm->purge.ipmsgtag;
 953         }
 954         local_bh_enable();
 955         return rc;
 956 }
 957 EXPORT_SYMBOL(iucv_message_purge);
 958
 959 /**
 960  * iucv_message_receive
 961  * @path: address of iucv path structure
 962  * @msg: address of iucv msg structure
 963  * @flags: how the message is received (IUCV_IPBUFLST)
 964  * @buffer: address of data buffer or address of struct iucv_array
 965  * @size: length of data buffer
 966  * @residual:
 967  *
 968  * This function receives messages that are being sent to you over
 969  * established paths. This function will deal with RMDATA messages
 970  * embedded in struct iucv_message as well.
 971  *
 972  * Returns the result from the CP IUCV call.
 973  */
 974 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 975                          u8 flags, void *buffer, size_t size, size_t *residual)
 976 {
 977         union iucv_param *parm;
 978         struct iucv_array *array;
 979         u8 *rmmsg;
 980         size_t copy;
 981         int rc;
 982
 983         if (msg->flags & IUCV_IPRMDATA) {
 984                 /*
 985                  * Message is 8 bytes long and has been stored to the
 986                  * message descriptor itself.
 987                  */
 988                 rc = (size < 8) ? 5 : 0;
 989                 if (residual)
 990                         *residual = abs(size - 8);
 991                 rmmsg = msg->rmmsg;
 992                 if (flags & IUCV_IPBUFLST) {
 993                         /* Copy to struct iucv_array. */
 994                         size = (size < 8) ? size : 8;
 995                         for (array = buffer; size > 0; array++) {
 996                                 copy = min_t(size_t, size, array->length);
 997                                 memcpy((u8 *)(addr_t) array->address,
 998                                        rmmsg, copy);
 999                                 rmmsg += copy;
1000                                 size -= copy;
1001                         }
1002                 } else {
1003                         /* Copy to direct buffer. */
1004                         memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1005                 }
1006                 return 0;
1007         }
1008
1009         local_bh_disable();
1010         parm = iucv_param[smp_processor_id()];
1011         memset(parm, 0, sizeof(union iucv_param));
1012         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1013         parm->db.ipbfln1f = (u32) size;
1014         parm->db.ipmsgid = msg->id;
1015         parm->db.ippathid = path->pathid;
1016         parm->db.iptrgcls = msg->class;
1017         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1018                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1019         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1020         if (!rc || rc == 5) {
1021                 msg->flags = parm->db.ipflags1;
1022                 if (residual)
1023                         *residual = parm->db.ipbfln1f;
1024         }
1025         local_bh_enable();
1026         return rc;
1027 }
1028 EXPORT_SYMBOL(iucv_message_receive);
1029
1030 /**
1031  * iucv_message_reject
1032  * @path: address of iucv path structure
1033  * @msg: address of iucv msg structure
1034  *
1035  * The reject function refuses a specified message. Between the time you
1036  * are notified of a message and the time that you complete the message,
1037  * the message may be rejected.
1038  *
1039  * Returns the result from the CP IUCV call.
1040  */
1041 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1042 {
1043         union iucv_param *parm;
1044         int rc;
1045
1046         local_bh_disable();
1047         parm = iucv_param[smp_processor_id()];
1048         memset(parm, 0, sizeof(union iucv_param));
1049         parm->db.ippathid = path->pathid;
1050         parm->db.ipmsgid = msg->id;
1051         parm->db.iptrgcls = msg->class;
1052         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1053         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1054         local_bh_enable();
1055         return rc;
1056 }
1057 EXPORT_SYMBOL(iucv_message_reject);
1058
1059 /**
1060  * iucv_message_reply
1061  * @path: address of iucv path structure
1062  * @msg: address of iucv msg structure
1063  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1064  * @reply: address of reply data buffer or address of struct iucv_array
1065  * @size: length of reply data buffer
1066  *
1067  * This function responds to the two-way messages that you receive. You
1068  * must identify completely the message to which you wish to reply. ie,
1069  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1070  * the parameter list.
1071  *
1072  * Returns the result from the CP IUCV call.
1073  */
1074 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1075                        u8 flags, void *reply, size_t size)
1076 {
1077         union iucv_param *parm;
1078         int rc;
1079
1080         local_bh_disable();
1081         parm = iucv_param[smp_processor_id()];
1082         memset(parm, 0, sizeof(union iucv_param));
1083         if (flags & IUCV_IPRMDATA) {
1084                 parm->dpl.ippathid = path->pathid;
1085                 parm->dpl.ipflags1 = flags;
1086                 parm->dpl.ipmsgid = msg->id;
1087                 parm->dpl.iptrgcls = msg->class;
1088                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1089         } else {
1090                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1091                 parm->db.ipbfln1f = (u32) size;
1092                 parm->db.ippathid = path->pathid;
1093                 parm->db.ipflags1 = flags;
1094                 parm->db.ipmsgid = msg->id;
1095                 parm->db.iptrgcls = msg->class;
1096         }
1097         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1098         local_bh_enable();
1099         return rc;
1100 }
1101 EXPORT_SYMBOL(iucv_message_reply);
1102
1103 /**
1104  * iucv_message_send
1105  * @path: address of iucv path structure
1106  * @msg: address of iucv msg structure
1107  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1108  * @srccls: source class of message
1109  * @buffer: address of send buffer or address of struct iucv_array
1110  * @size: length of send buffer
1111  *
1112  * This function transmits data to another application. Data to be
1113  * transmitted is in a buffer and this is a one-way message and the
1114  * receiver will not reply to the message.
1115  *
1116  * Returns the result from the CP IUCV call.
1117  */
1118 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1119                       u8 flags, u32 srccls, void *buffer, size_t size)
1120 {
1121         union iucv_param *parm;
1122         int rc;
1123
1124         local_bh_disable();
1125         parm = iucv_param[smp_processor_id()];
1126         memset(parm, 0, sizeof(union iucv_param));
1127         if (flags & IUCV_IPRMDATA) {
1128                 /* Message of 8 bytes can be placed into the parameter list. */
1129                 parm->dpl.ippathid = path->pathid;
1130                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1131                 parm->dpl.iptrgcls = msg->class;
1132                 parm->dpl.ipsrccls = srccls;
1133                 parm->dpl.ipmsgtag = msg->tag;
1134                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1135         } else {
1136                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1137                 parm->db.ipbfln1f = (u32) size;
1138                 parm->db.ippathid = path->pathid;
1139                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1140                 parm->db.iptrgcls = msg->class;
1141                 parm->db.ipsrccls = srccls;
1142                 parm->db.ipmsgtag = msg->tag;
1143         }
1144         rc = iucv_call_b2f0(IUCV_SEND, parm);
1145         if (!rc)
1146                 msg->id = parm->db.ipmsgid;
1147         local_bh_enable();
1148         return rc;
1149 }
1150 EXPORT_SYMBOL(iucv_message_send);
1151
1152 /**
1153  * iucv_message_send2way
1154  * @path: address of iucv path structure
1155  * @msg: address of iucv msg structure
1156  * @flags: how the message is sent and the reply is received
1157  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1158  * @srccls: source class of message
1159  * @buffer: address of send buffer or address of struct iucv_array
1160  * @size: length of send buffer
1161  * @ansbuf: address of answer buffer or address of struct iucv_array
1162  * @asize: size of reply buffer
1163  *
1164  * This function transmits data to another application. Data to be
1165  * transmitted is in a buffer. The receiver of the send is expected to
1166  * reply to the message and a buffer is provided into which IUCV moves
1167  * the reply to this message.
1168  *
1169  * Returns the result from the CP IUCV call.
1170  */
1171 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1172                           u8 flags, u32 srccls, void *buffer, size_t size,
1173                           void *answer, size_t asize, size_t *residual)
1174 {
1175         union iucv_param *parm;
1176         int rc;
1177
1178         local_bh_disable();
1179         parm = iucv_param[smp_processor_id()];
1180         memset(parm, 0, sizeof(union iucv_param));
1181         if (flags & IUCV_IPRMDATA) {
1182                 parm->dpl.ippathid = path->pathid;
1183                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1184                 parm->dpl.iptrgcls = msg->class;
1185                 parm->dpl.ipsrccls = srccls;
1186                 parm->dpl.ipmsgtag = msg->tag;
1187                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1188                 parm->dpl.ipbfln2f = (u32) asize;
1189                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1190         } else {
1191                 parm->db.ippathid = path->pathid;
1192                 parm->db.ipflags1 = path->flags;        /* priority message */
1193                 parm->db.iptrgcls = msg->class;
1194                 parm->db.ipsrccls = srccls;
1195                 parm->db.ipmsgtag = msg->tag;
1196                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1197                 parm->db.ipbfln1f = (u32) size;
1198                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1199                 parm->db.ipbfln2f = (u32) asize;
1200         }
1201         rc = iucv_call_b2f0(IUCV_SEND, parm);
1202         if (!rc)
1203                 msg->id = parm->db.ipmsgid;
1204         local_bh_enable();
1205         return rc;
1206 }
1207 EXPORT_SYMBOL(iucv_message_send2way);
1208
1209 /**
1210  * iucv_path_pending
1211  * @data: Pointer to external interrupt buffer
1212  *
1213  * Process connection pending work item. Called from tasklet while holding
1214  * iucv_table_lock.
1215  */
1216 struct iucv_path_pending {
1217         u16 ippathid;
1218         u8  ipflags1;
1219         u8  iptype;
1220         u16 ipmsglim;
1221         u16 res1;
1222         u8  ipvmid[8];
1223         u8  ipuser[16];
1224         u32 res3;
1225         u8  ippollfg;
1226         u8  res4[3];
1227 } __attribute__ ((packed));
1228
1229 static void iucv_path_pending(struct iucv_irq_data *data)
1230 {
1231         struct iucv_path_pending *ipp = (void *) data;
1232         struct iucv_handler *handler;
1233         struct iucv_path *path;
1234         char *error;
1235
1236         BUG_ON(iucv_path_table[ipp->ippathid]);
1237         /* New pathid, handler found. Create a new path struct. */
1238         error = iucv_error_no_memory;
1239         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1240         if (!path)
1241                 goto out_sever;
1242         path->pathid = ipp->ippathid;
1243         iucv_path_table[path->pathid] = path;
1244         EBCASC(ipp->ipvmid, 8);
1245
1246         /* Call registered handler until one is found that wants the path. */
1247         list_for_each_entry(handler, &iucv_handler_list, list) {
1248                 if (!handler->path_pending)
1249                         continue;
1250                 /*
1251                  * Add path to handler to allow a call to iucv_path_sever
1252                  * inside the path_pending function. If the handler returns
1253                  * an error remove the path from the handler again.
1254                  */
1255                 list_add(&path->list, &handler->paths);
1256                 path->handler = handler;
1257                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1258                         return;
1259                 list_del(&path->list);
1260                 path->handler = NULL;
1261         }
1262         /* No handler wanted the path. */
1263         iucv_path_table[path->pathid] = NULL;
1264         iucv_path_free(path);
1265         error = iucv_error_no_listener;
1266 out_sever:
1267         iucv_sever_pathid(ipp->ippathid, error);
1268 }
1269
1270 /**
1271  * iucv_path_complete
1272  * @data: Pointer to external interrupt buffer
1273  *
1274  * Process connection complete work item. Called from tasklet while holding
1275  * iucv_table_lock.
1276  */
1277 struct iucv_path_complete {
1278         u16 ippathid;
1279         u8  ipflags1;
1280         u8  iptype;
1281         u16 ipmsglim;
1282         u16 res1;
1283         u8  res2[8];
1284         u8  ipuser[16];
1285         u32 res3;
1286         u8  ippollfg;
1287         u8  res4[3];
1288 } __attribute__ ((packed));
1289
1290 static void iucv_path_complete(struct iucv_irq_data *data)
1291 {
1292         struct iucv_path_complete *ipc = (void *) data;
1293         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1294
1295         if (path && path->handler && path->handler->path_complete)
1296                 path->handler->path_complete(path, ipc->ipuser);
1297 }
1298
1299 /**
1300  * iucv_path_severed
1301  * @data: Pointer to external interrupt buffer
1302  *
1303  * Process connection severed work item. Called from tasklet while holding
1304  * iucv_table_lock.
1305  */
1306 struct iucv_path_severed {
1307         u16 ippathid;
1308         u8  res1;
1309         u8  iptype;
1310         u32 res2;
1311         u8  res3[8];
1312         u8  ipuser[16];
1313         u32 res4;
1314         u8  ippollfg;
1315         u8  res5[3];
1316 } __attribute__ ((packed));
1317
1318 static void iucv_path_severed(struct iucv_irq_data *data)
1319 {
1320         struct iucv_path_severed *ips = (void *) data;
1321         struct iucv_path *path = iucv_path_table[ips->ippathid];
1322
1323         if (!path || !path->handler)    /* Already severed */
1324                 return;
1325         if (path->handler->path_severed)
1326                 path->handler->path_severed(path, ips->ipuser);
1327         else {
1328                 iucv_sever_pathid(path->pathid, NULL);
1329                 iucv_path_table[path->pathid] = NULL;
1330                 list_del_init(&path->list);
1331                 iucv_path_free(path);
1332         }
1333 }
1334
1335 /**
1336  * iucv_path_quiesced
1337  * @data: Pointer to external interrupt buffer
1338  *
1339  * Process connection quiesced work item. Called from tasklet while holding
1340  * iucv_table_lock.
1341  */
1342 struct iucv_path_quiesced {
1343         u16 ippathid;
1344         u8  res1;
1345         u8  iptype;
1346         u32 res2;
1347         u8  res3[8];
1348         u8  ipuser[16];
1349         u32 res4;
1350         u8  ippollfg;
1351         u8  res5[3];
1352 } __attribute__ ((packed));
1353
1354 static void iucv_path_quiesced(struct iucv_irq_data *data)
1355 {
1356         struct iucv_path_quiesced *ipq = (void *) data;
1357         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1358
1359         if (path && path->handler && path->handler->path_quiesced)
1360                 path->handler->path_quiesced(path, ipq->ipuser);
1361 }
1362
1363 /**
1364  * iucv_path_resumed
1365  * @data: Pointer to external interrupt buffer
1366  *
1367  * Process connection resumed work item. Called from tasklet while holding
1368  * iucv_table_lock.
1369  */
1370 struct iucv_path_resumed {
1371         u16 ippathid;
1372         u8  res1;
1373         u8  iptype;
1374         u32 res2;
1375         u8  res3[8];
1376         u8  ipuser[16];
1377         u32 res4;
1378         u8  ippollfg;
1379         u8  res5[3];
1380 } __attribute__ ((packed));
1381
1382 static void iucv_path_resumed(struct iucv_irq_data *data)
1383 {
1384         struct iucv_path_resumed *ipr = (void *) data;
1385         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1386
1387         if (path && path->handler && path->handler->path_resumed)
1388                 path->handler->path_resumed(path, ipr->ipuser);
1389 }
1390
1391 /**
1392  * iucv_message_complete
1393  * @data: Pointer to external interrupt buffer
1394  *
1395  * Process message complete work item. Called from tasklet while holding
1396  * iucv_table_lock.
1397  */
1398 struct iucv_message_complete {
1399         u16 ippathid;
1400         u8  ipflags1;
1401         u8  iptype;
1402         u32 ipmsgid;
1403         u32 ipaudit;
1404         u8  iprmmsg[8];
1405         u32 ipsrccls;
1406         u32 ipmsgtag;
1407         u32 res;
1408         u32 ipbfln2f;
1409         u8  ippollfg;
1410         u8  res2[3];
1411 } __attribute__ ((packed));
1412
1413 static void iucv_message_complete(struct iucv_irq_data *data)
1414 {
1415         struct iucv_message_complete *imc = (void *) data;
1416         struct iucv_path *path = iucv_path_table[imc->ippathid];
1417         struct iucv_message msg;
1418
1419         if (path && path->handler && path->handler->message_complete) {
1420                 msg.flags = imc->ipflags1;
1421                 msg.id = imc->ipmsgid;
1422                 msg.audit = imc->ipaudit;
1423                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1424                 msg.class = imc->ipsrccls;
1425                 msg.tag = imc->ipmsgtag;
1426                 msg.length = imc->ipbfln2f;
1427                 path->handler->message_complete(path, &msg);
1428         }
1429 }
1430
1431 /**
1432  * iucv_message_pending
1433  * @data: Pointer to external interrupt buffer
1434  *
1435  * Process message pending work item. Called from tasklet while holding
1436  * iucv_table_lock.
1437  */
1438 struct iucv_message_pending {
1439         u16 ippathid;
1440         u8  ipflags1;
1441         u8  iptype;
1442         u32 ipmsgid;
1443         u32 iptrgcls;
1444         union {
1445                 u32 iprmmsg1_u32;
1446                 u8  iprmmsg1[4];
1447         } ln1msg1;
1448         union {
1449                 u32 ipbfln1f;
1450                 u8  iprmmsg2[4];
1451         } ln1msg2;
1452         u32 res1[3];
1453         u32 ipbfln2f;
1454         u8  ippollfg;
1455         u8  res2[3];
1456 } __attribute__ ((packed));
1457
1458 static void iucv_message_pending(struct iucv_irq_data *data)
1459 {
1460         struct iucv_message_pending *imp = (void *) data;
1461         struct iucv_path *path = iucv_path_table[imp->ippathid];
1462         struct iucv_message msg;
1463
1464         if (path && path->handler && path->handler->message_pending) {
1465                 msg.flags = imp->ipflags1;
1466                 msg.id = imp->ipmsgid;
1467                 msg.class = imp->iptrgcls;
1468                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1469                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1470                         msg.length = 8;
1471                 } else
1472                         msg.length = imp->ln1msg2.ipbfln1f;
1473                 msg.reply_size = imp->ipbfln2f;
1474                 path->handler->message_pending(path, &msg);
1475         }
1476 }
1477
1478 /**
1479  * iucv_tasklet_fn:
1480  *
1481  * This tasklet loops over the queue of irq buffers created by
1482  * iucv_external_interrupt, calls the appropriate action handler
1483  * and then frees the buffer.
1484  */
1485 static void iucv_tasklet_fn(unsigned long ignored)
1486 {
1487         typedef void iucv_irq_fn(struct iucv_irq_data *);
1488         static iucv_irq_fn *irq_fn[] = {
1489                 [0x02] = iucv_path_complete,
1490                 [0x03] = iucv_path_severed,
1491                 [0x04] = iucv_path_quiesced,
1492                 [0x05] = iucv_path_resumed,
1493                 [0x06] = iucv_message_complete,
1494                 [0x07] = iucv_message_complete,
1495                 [0x08] = iucv_message_pending,
1496                 [0x09] = iucv_message_pending,
1497         };
1498         LIST_HEAD(task_queue);
1499         struct iucv_irq_list *p, *n;
1500
1501         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1502         if (!spin_trylock(&iucv_table_lock)) {
1503                 tasklet_schedule(&iucv_tasklet);
1504                 return;
1505         }
1506         iucv_active_cpu = smp_processor_id();
1507
1508         spin_lock_irq(&iucv_queue_lock);
1509         list_splice_init(&iucv_task_queue, &task_queue);
1510         spin_unlock_irq(&iucv_queue_lock);
1511
1512         list_for_each_entry_safe(p, n, &task_queue, list) {
1513                 list_del_init(&p->list);
1514                 irq_fn[p->data.iptype](&p->data);
1515                 kfree(p);
1516         }
1517
1518         iucv_active_cpu = -1;
1519         spin_unlock(&iucv_table_lock);
1520 }
1521
1522 /**
1523  * iucv_work_fn:
1524  *
1525  * This work function loops over the queue of path pending irq blocks
1526  * created by iucv_external_interrupt, calls the appropriate action
1527  * handler and then frees the buffer.
1528  */
1529 static void iucv_work_fn(struct work_struct *work)
1530 {
1531         typedef void iucv_irq_fn(struct iucv_irq_data *);
1532         LIST_HEAD(work_queue);
1533         struct iucv_irq_list *p, *n;
1534
1535         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1536         spin_lock_bh(&iucv_table_lock);
1537         iucv_active_cpu = smp_processor_id();
1538
1539         spin_lock_irq(&iucv_queue_lock);
1540         list_splice_init(&iucv_work_queue, &work_queue);
1541         spin_unlock_irq(&iucv_queue_lock);
1542
1543         iucv_cleanup_queue();
1544         list_for_each_entry_safe(p, n, &work_queue, list) {
1545                 list_del_init(&p->list);
1546                 iucv_path_pending(&p->data);
1547                 kfree(p);
1548         }
1549
1550         iucv_active_cpu = -1;
1551         spin_unlock_bh(&iucv_table_lock);
1552 }
1553
1554 /**
1555  * iucv_external_interrupt
1556  * @code: irq code
1557  *
1558  * Handles external interrupts coming in from CP.
1559  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1560  */
1561 static void iucv_external_interrupt(u16 code)
1562 {
1563         struct iucv_irq_data *p;
1564         struct iucv_irq_list *work;
1565
1566         p = iucv_irq_data[smp_processor_id()];
1567         if (p->ippathid >= iucv_max_pathid) {
1568                 WARN_ON(p->ippathid >= iucv_max_pathid);
1569                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1570                 return;
1571         }
1572         BUG_ON(p->iptype  < 0x01 || p->iptype > 0x09);
1573         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1574         if (!work) {
1575                 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1576                 return;
1577         }
1578         memcpy(&work->data, p, sizeof(work->data));
1579         spin_lock(&iucv_queue_lock);
1580         if (p->iptype == 0x01) {
1581                 /* Path pending interrupt. */
1582                 list_add_tail(&work->list, &iucv_work_queue);
1583                 schedule_work(&iucv_work);
1584         } else {
1585                 /* The other interrupts. */
1586                 list_add_tail(&work->list, &iucv_task_queue);
1587                 tasklet_schedule(&iucv_tasklet);
1588         }
1589         spin_unlock(&iucv_queue_lock);
1590 }
1591
1592 /**
1593  * iucv_init
1594  *
1595  * Allocates and initializes various data structures.
1596  */
1597 static int __init iucv_init(void)
1598 {
1599         int rc;
1600         int cpu;
1601
1602         if (!MACHINE_IS_VM) {
1603                 rc = -EPROTONOSUPPORT;
1604                 goto out;
1605         }
1606         rc = iucv_query_maxconn();
1607         if (rc)
1608                 goto out;
1609         rc = register_external_interrupt(0x4000, iucv_external_interrupt);
1610         if (rc)
1611                 goto out;
1612         iucv_root = s390_root_dev_register("iucv");
1613         if (IS_ERR(iucv_root)) {
1614                 rc = PTR_ERR(iucv_root);
1615                 goto out_int;
1616         }
1617
1618         for_each_online_cpu(cpu) {
1619                 /* Note: GFP_DMA used to get memory below 2G */
1620                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1621                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1622                 if (!iucv_irq_data[cpu]) {
1623                         rc = -ENOMEM;
1624                         goto out_free;
1625                 }
1626
1627                 /* Allocate parameter blocks. */
1628                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1629                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1630                 if (!iucv_param[cpu]) {
1631                         rc = -ENOMEM;
1632                         goto out_free;
1633                 }
1634         }
1635         rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1636         if (rc)
1637                 goto out_free;
1638         ASCEBC(iucv_error_no_listener, 16);
1639         ASCEBC(iucv_error_no_memory, 16);
1640         ASCEBC(iucv_error_pathid, 16);
1641         iucv_available = 1;
1642         rc = bus_register(&iucv_bus);
1643         if (rc)
1644                 goto out_cpu;
1645         return 0;
1646
1647 out_cpu:
1648         unregister_hotcpu_notifier(&iucv_cpu_notifier);
1649 out_free:
1650         for_each_possible_cpu(cpu) {
1651                 kfree(iucv_param[cpu]);
1652                 iucv_param[cpu] = NULL;
1653                 kfree(iucv_irq_data[cpu]);
1654                 iucv_irq_data[cpu] = NULL;
1655         }
1656         s390_root_dev_unregister(iucv_root);
1657 out_int:
1658         unregister_external_interrupt(0x4000, iucv_external_interrupt);
1659 out:
1660         return rc;
1661 }
1662
1663 /**
1664  * iucv_exit
1665  *
1666  * Frees everything allocated from iucv_init.
1667  */
1668 static void __exit iucv_exit(void)
1669 {
1670         struct iucv_irq_list *p, *n;
1671         int cpu;
1672
1673         spin_lock_irq(&iucv_queue_lock);
1674         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1675                 kfree(p);
1676         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1677                 kfree(p);
1678         spin_unlock_irq(&iucv_queue_lock);
1679         unregister_hotcpu_notifier(&iucv_cpu_notifier);
1680         for_each_possible_cpu(cpu) {
1681                 kfree(iucv_param[cpu]);
1682                 iucv_param[cpu] = NULL;
1683                 kfree(iucv_irq_data[cpu]);
1684                 iucv_irq_data[cpu] = NULL;
1685         }
1686         s390_root_dev_unregister(iucv_root);
1687         bus_unregister(&iucv_bus);
1688         unregister_external_interrupt(0x4000, iucv_external_interrupt);
1689 }
1690
1691 subsys_initcall(iucv_init);
1692 module_exit(iucv_exit);
1693
1694 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1695 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1696 MODULE_LICENSE("GPL");