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         preempt_disable();
 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, 0, 1);
 484         preempt_enable();
 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(cpu, cpumask)
 501                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 0, 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         preempt_disable();
 525         for_each_online_cpu(cpu)
 526                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
 527         preempt_enable();
 528         if (cpus_empty(iucv_buffer_cpumask))
 529                 /* No cpu could declare an iucv buffer. */
 530                 goto out_path;
 531         return 0;
 532
 533 out_path:
 534         kfree(iucv_path_table);
 535 out:
 536         return rc;
 537 }
 538
 539 /**
 540  * iucv_disable
 541  *
 542  * This function shuts down iucv. It disables iucv interrupts, retrieves
 543  * the iucv interrupt buffer and frees the pathid table. Called after the
 544  * last user unregister its iucv handler.
 545  */
 546 static void iucv_disable(void)
 547 {
 548         on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
 549         kfree(iucv_path_table);
 550 }
 551
 552 static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
 553                                      unsigned long action, void *hcpu)
 554 {
 555         cpumask_t cpumask;
 556         long cpu = (long) hcpu;
 557
 558         switch (action) {
 559         case CPU_UP_PREPARE:
 560         case CPU_UP_PREPARE_FROZEN:
 561                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
 562                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 563                 if (!iucv_irq_data[cpu])
 564                         return NOTIFY_BAD;
 565                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
 566                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
 567                 if (!iucv_param[cpu])
 568                         return NOTIFY_BAD;
 569                 break;
 570         case CPU_UP_CANCELED:
 571         case CPU_UP_CANCELED_FROZEN:
 572         case CPU_DEAD:
 573         case CPU_DEAD_FROZEN:
 574                 kfree(iucv_param[cpu]);
 575                 iucv_param[cpu] = NULL;
 576                 kfree(iucv_irq_data[cpu]);
 577                 iucv_irq_data[cpu] = NULL;
 578                 break;
 579         case CPU_ONLINE:
 580         case CPU_ONLINE_FROZEN:
 581         case CPU_DOWN_FAILED:
 582         case CPU_DOWN_FAILED_FROZEN:
 583                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
 584                 break;
 585         case CPU_DOWN_PREPARE:
 586         case CPU_DOWN_PREPARE_FROZEN:
 587                 cpumask = iucv_buffer_cpumask;
 588                 cpu_clear(cpu, cpumask);
 589                 if (cpus_empty(cpumask))
 590                         /* Can't offline last IUCV enabled cpu. */
 591                         return NOTIFY_BAD;
 592                 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 0, 1);
 593                 if (cpus_empty(iucv_irq_cpumask))
 594                         smp_call_function_single(first_cpu(iucv_buffer_cpumask),
 595                                                  iucv_allow_cpu, NULL, 0, 1);
 596                 break;
 597         }
 598         return NOTIFY_OK;
 599 }
 600
 601 static struct notifier_block __cpuinitdata iucv_cpu_notifier = {
 602         .notifier_call = iucv_cpu_notify,
 603 };
 604
 605 /**
 606  * iucv_sever_pathid
 607  * @pathid: path identification number.
 608  * @userdata: 16-bytes of user data.
 609  *
 610  * Sever an iucv path to free up the pathid. Used internally.
 611  */
 612 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
 613 {
 614         union iucv_param *parm;
 615
 616         parm = iucv_param[smp_processor_id()];
 617         memset(parm, 0, sizeof(union iucv_param));
 618         if (userdata)
 619                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 620         parm->ctrl.ippathid = pathid;
 621         return iucv_call_b2f0(IUCV_SEVER, parm);
 622 }
 623
 624 /**
 625  * __iucv_cleanup_queue
 626  * @dummy: unused dummy argument
 627  *
 628  * Nop function called via smp_call_function to force work items from
 629  * pending external iucv interrupts to the work queue.
 630  */
 631 static void __iucv_cleanup_queue(void *dummy)
 632 {
 633 }
 634
 635 /**
 636  * iucv_cleanup_queue
 637  *
 638  * Function called after a path has been severed to find all remaining
 639  * work items for the now stale pathid. The caller needs to hold the
 640  * iucv_table_lock.
 641  */
 642 static void iucv_cleanup_queue(void)
 643 {
 644         struct iucv_irq_list *p, *n;
 645
 646         /*
 647          * When a path is severed, the pathid can be reused immediatly
 648          * on a iucv connect or a connection pending interrupt. Remove
 649          * all entries from the task queue that refer to a stale pathid
 650          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
 651          * or deliver the connection pending interrupt. To get all the
 652          * pending interrupts force them to the work queue by calling
 653          * an empty function on all cpus.
 654          */
 655         smp_call_function(__iucv_cleanup_queue, NULL, 0, 1);
 656         spin_lock_irq(&iucv_queue_lock);
 657         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
 658                 /* Remove stale work items from the task queue. */
 659                 if (iucv_path_table[p->data.ippathid] == NULL) {
 660                         list_del(&p->list);
 661                         kfree(p);
 662                 }
 663         }
 664         spin_unlock_irq(&iucv_queue_lock);
 665 }
 666
 667 /**
 668  * iucv_register:
 669  * @handler: address of iucv handler structure
 670  * @smp: != 0 indicates that the handler can deal with out of order messages
 671  *
 672  * Registers a driver with IUCV.
 673  *
 674  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 675  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 676  */
 677 int iucv_register(struct iucv_handler *handler, int smp)
 678 {
 679         int rc;
 680
 681         if (!iucv_available)
 682                 return -ENOSYS;
 683         mutex_lock(&iucv_register_mutex);
 684         if (!smp)
 685                 iucv_nonsmp_handler++;
 686         if (list_empty(&iucv_handler_list)) {
 687                 rc = iucv_enable();
 688                 if (rc)
 689                         goto out_mutex;
 690         } else if (!smp && iucv_nonsmp_handler == 1)
 691                 iucv_setmask_up();
 692         INIT_LIST_HEAD(&handler->paths);
 693
 694         spin_lock_bh(&iucv_table_lock);
 695         list_add_tail(&handler->list, &iucv_handler_list);
 696         spin_unlock_bh(&iucv_table_lock);
 697         rc = 0;
 698 out_mutex:
 699         mutex_unlock(&iucv_register_mutex);
 700         return rc;
 701 }
 702 EXPORT_SYMBOL(iucv_register);
 703
 704 /**
 705  * iucv_unregister
 706  * @handler:  address of iucv handler structure
 707  * @smp: != 0 indicates that the handler can deal with out of order messages
 708  *
 709  * Unregister driver from IUCV.
 710  */
 711 void iucv_unregister(struct iucv_handler *handler, int smp)
 712 {
 713         struct iucv_path *p, *n;
 714
 715         mutex_lock(&iucv_register_mutex);
 716         spin_lock_bh(&iucv_table_lock);
 717         /* Remove handler from the iucv_handler_list. */
 718         list_del_init(&handler->list);
 719         /* Sever all pathids still refering to the handler. */
 720         list_for_each_entry_safe(p, n, &handler->paths, list) {
 721                 iucv_sever_pathid(p->pathid, NULL);
 722                 iucv_path_table[p->pathid] = NULL;
 723                 list_del(&p->list);
 724                 iucv_path_free(p);
 725         }
 726         spin_unlock_bh(&iucv_table_lock);
 727         if (!smp)
 728                 iucv_nonsmp_handler--;
 729         if (list_empty(&iucv_handler_list))
 730                 iucv_disable();
 731         else if (!smp && iucv_nonsmp_handler == 0)
 732                 iucv_setmask_mp();
 733         mutex_unlock(&iucv_register_mutex);
 734 }
 735 EXPORT_SYMBOL(iucv_unregister);
 736
 737 /**
 738  * iucv_path_accept
 739  * @path: address of iucv path structure
 740  * @handler: address of iucv handler structure
 741  * @userdata: 16 bytes of data reflected to the communication partner
 742  * @private: private data passed to interrupt handlers for this path
 743  *
 744  * This function is issued after the user received a connection pending
 745  * external interrupt and now wishes to complete the IUCV communication path.
 746  *
 747  * Returns the result of the CP IUCV call.
 748  */
 749 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 750                      u8 userdata[16], void *private)
 751 {
 752         union iucv_param *parm;
 753         int rc;
 754
 755         local_bh_disable();
 756         /* Prepare parameter block. */
 757         parm = iucv_param[smp_processor_id()];
 758         memset(parm, 0, sizeof(union iucv_param));
 759         parm->ctrl.ippathid = path->pathid;
 760         parm->ctrl.ipmsglim = path->msglim;
 761         if (userdata)
 762                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 763         parm->ctrl.ipflags1 = path->flags;
 764
 765         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
 766         if (!rc) {
 767                 path->private = private;
 768                 path->msglim = parm->ctrl.ipmsglim;
 769                 path->flags = parm->ctrl.ipflags1;
 770         }
 771         local_bh_enable();
 772         return rc;
 773 }
 774 EXPORT_SYMBOL(iucv_path_accept);
 775
 776 /**
 777  * iucv_path_connect
 778  * @path: address of iucv path structure
 779  * @handler: address of iucv handler structure
 780  * @userid: 8-byte user identification
 781  * @system: 8-byte target system identification
 782  * @userdata: 16 bytes of data reflected to the communication partner
 783  * @private: private data passed to interrupt handlers for this path
 784  *
 785  * This function establishes an IUCV path. Although the connect may complete
 786  * successfully, you are not able to use the path until you receive an IUCV
 787  * Connection Complete external interrupt.
 788  *
 789  * Returns the result of the CP IUCV call.
 790  */
 791 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 792                       u8 userid[8], u8 system[8], u8 userdata[16],
 793                       void *private)
 794 {
 795         union iucv_param *parm;
 796         int rc;
 797
 798         BUG_ON(in_atomic());
 799         spin_lock_bh(&iucv_table_lock);
 800         iucv_cleanup_queue();
 801         parm = iucv_param[smp_processor_id()];
 802         memset(parm, 0, sizeof(union iucv_param));
 803         parm->ctrl.ipmsglim = path->msglim;
 804         parm->ctrl.ipflags1 = path->flags;
 805         if (userid) {
 806                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
 807                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 808                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
 809         }
 810         if (system) {
 811                 memcpy(parm->ctrl.iptarget, system,
 812                        sizeof(parm->ctrl.iptarget));
 813                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 814                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
 815         }
 816         if (userdata)
 817                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 818
 819         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
 820         if (!rc) {
 821                 if (parm->ctrl.ippathid < iucv_max_pathid) {
 822                         path->pathid = parm->ctrl.ippathid;
 823                         path->msglim = parm->ctrl.ipmsglim;
 824                         path->flags = parm->ctrl.ipflags1;
 825                         path->handler = handler;
 826                         path->private = private;
 827                         list_add_tail(&path->list, &handler->paths);
 828                         iucv_path_table[path->pathid] = path;
 829                 } else {
 830                         iucv_sever_pathid(parm->ctrl.ippathid,
 831                                           iucv_error_pathid);
 832                         rc = -EIO;
 833                 }
 834         }
 835         spin_unlock_bh(&iucv_table_lock);
 836         return rc;
 837 }
 838 EXPORT_SYMBOL(iucv_path_connect);
 839
 840 /**
 841  * iucv_path_quiesce:
 842  * @path: address of iucv path structure
 843  * @userdata: 16 bytes of data reflected to the communication partner
 844  *
 845  * This function temporarily suspends incoming messages on an IUCV path.
 846  * You can later reactivate the path by invoking the iucv_resume function.
 847  *
 848  * Returns the result from the CP IUCV call.
 849  */
 850 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
 851 {
 852         union iucv_param *parm;
 853         int rc;
 854
 855         local_bh_disable();
 856         parm = iucv_param[smp_processor_id()];
 857         memset(parm, 0, sizeof(union iucv_param));
 858         if (userdata)
 859                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 860         parm->ctrl.ippathid = path->pathid;
 861         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
 862         local_bh_enable();
 863         return rc;
 864 }
 865 EXPORT_SYMBOL(iucv_path_quiesce);
 866
 867 /**
 868  * iucv_path_resume:
 869  * @path: address of iucv path structure
 870  * @userdata: 16 bytes of data reflected to the communication partner
 871  *
 872  * This function resumes incoming messages on an IUCV path that has
 873  * been stopped with iucv_path_quiesce.
 874  *
 875  * Returns the result from the CP IUCV call.
 876  */
 877 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
 878 {
 879         union iucv_param *parm;
 880         int rc;
 881
 882         local_bh_disable();
 883         parm = iucv_param[smp_processor_id()];
 884         memset(parm, 0, sizeof(union iucv_param));
 885         if (userdata)
 886                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
 887         parm->ctrl.ippathid = path->pathid;
 888         rc = iucv_call_b2f0(IUCV_RESUME, parm);
 889         local_bh_enable();
 890         return rc;
 891 }
 892
 893 /**
 894  * iucv_path_sever
 895  * @path: address of iucv path structure
 896  * @userdata: 16 bytes of data reflected to the communication partner
 897  *
 898  * This function terminates an IUCV path.
 899  *
 900  * Returns the result from the CP IUCV call.
 901  */
 902 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
 903 {
 904         int rc;
 905
 906         preempt_disable();
 907         if (iucv_active_cpu != smp_processor_id())
 908                 spin_lock_bh(&iucv_table_lock);
 909         rc = iucv_sever_pathid(path->pathid, userdata);
 910         if (!rc) {
 911                 iucv_path_table[path->pathid] = NULL;
 912                 list_del_init(&path->list);
 913         }
 914         if (iucv_active_cpu != smp_processor_id())
 915                 spin_unlock_bh(&iucv_table_lock);
 916         preempt_enable();
 917         return rc;
 918 }
 919 EXPORT_SYMBOL(iucv_path_sever);
 920
 921 /**
 922  * iucv_message_purge
 923  * @path: address of iucv path structure
 924  * @msg: address of iucv msg structure
 925  * @srccls: source class of message
 926  *
 927  * Cancels a message you have sent.
 928  *
 929  * Returns the result from the CP IUCV call.
 930  */
 931 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
 932                        u32 srccls)
 933 {
 934         union iucv_param *parm;
 935         int rc;
 936
 937         local_bh_disable();
 938         parm = iucv_param[smp_processor_id()];
 939         memset(parm, 0, sizeof(union iucv_param));
 940         parm->purge.ippathid = path->pathid;
 941         parm->purge.ipmsgid = msg->id;
 942         parm->purge.ipsrccls = srccls;
 943         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
 944         rc = iucv_call_b2f0(IUCV_PURGE, parm);
 945         if (!rc) {
 946                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
 947                 msg->tag = parm->purge.ipmsgtag;
 948         }
 949         local_bh_enable();
 950         return rc;
 951 }
 952 EXPORT_SYMBOL(iucv_message_purge);
 953
 954 /**
 955  * iucv_message_receive
 956  * @path: address of iucv path structure
 957  * @msg: address of iucv msg structure
 958  * @flags: how the message is received (IUCV_IPBUFLST)
 959  * @buffer: address of data buffer or address of struct iucv_array
 960  * @size: length of data buffer
 961  * @residual:
 962  *
 963  * This function receives messages that are being sent to you over
 964  * established paths. This function will deal with RMDATA messages
 965  * embedded in struct iucv_message as well.
 966  *
 967  * Returns the result from the CP IUCV call.
 968  */
 969 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 970                          u8 flags, void *buffer, size_t size, size_t *residual)
 971 {
 972         union iucv_param *parm;
 973         struct iucv_array *array;
 974         u8 *rmmsg;
 975         size_t copy;
 976         int rc;
 977
 978         if (msg->flags & IUCV_IPRMDATA) {
 979                 /*
 980                  * Message is 8 bytes long and has been stored to the
 981                  * message descriptor itself.
 982                  */
 983                 rc = (size < 8) ? 5 : 0;
 984                 if (residual)
 985                         *residual = abs(size - 8);
 986                 rmmsg = msg->rmmsg;
 987                 if (flags & IUCV_IPBUFLST) {
 988                         /* Copy to struct iucv_array. */
 989                         size = (size < 8) ? size : 8;
 990                         for (array = buffer; size > 0; array++) {
 991                                 copy = min_t(size_t, size, array->length);
 992                                 memcpy((u8 *)(addr_t) array->address,
 993                                        rmmsg, copy);
 994                                 rmmsg += copy;
 995                                 size -= copy;
 996                         }
 997                 } else {
 998                         /* Copy to direct buffer. */
 999                         memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1000                 }
1001                 return 0;
1002         }
1003
1004         local_bh_disable();
1005         parm = iucv_param[smp_processor_id()];
1006         memset(parm, 0, sizeof(union iucv_param));
1007         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1008         parm->db.ipbfln1f = (u32) size;
1009         parm->db.ipmsgid = msg->id;
1010         parm->db.ippathid = path->pathid;
1011         parm->db.iptrgcls = msg->class;
1012         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1013                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1014         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1015         if (!rc || rc == 5) {
1016                 msg->flags = parm->db.ipflags1;
1017                 if (residual)
1018                         *residual = parm->db.ipbfln1f;
1019         }
1020         local_bh_enable();
1021         return rc;
1022 }
1023 EXPORT_SYMBOL(iucv_message_receive);
1024
1025 /**
1026  * iucv_message_reject
1027  * @path: address of iucv path structure
1028  * @msg: address of iucv msg structure
1029  *
1030  * The reject function refuses a specified message. Between the time you
1031  * are notified of a message and the time that you complete the message,
1032  * the message may be rejected.
1033  *
1034  * Returns the result from the CP IUCV call.
1035  */
1036 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1037 {
1038         union iucv_param *parm;
1039         int rc;
1040
1041         local_bh_disable();
1042         parm = iucv_param[smp_processor_id()];
1043         memset(parm, 0, sizeof(union iucv_param));
1044         parm->db.ippathid = path->pathid;
1045         parm->db.ipmsgid = msg->id;
1046         parm->db.iptrgcls = msg->class;
1047         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1048         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1049         local_bh_enable();
1050         return rc;
1051 }
1052 EXPORT_SYMBOL(iucv_message_reject);
1053
1054 /**
1055  * iucv_message_reply
1056  * @path: address of iucv path structure
1057  * @msg: address of iucv msg structure
1058  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1059  * @reply: address of reply data buffer or address of struct iucv_array
1060  * @size: length of reply data buffer
1061  *
1062  * This function responds to the two-way messages that you receive. You
1063  * must identify completely the message to which you wish to reply. ie,
1064  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1065  * the parameter list.
1066  *
1067  * Returns the result from the CP IUCV call.
1068  */
1069 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1070                        u8 flags, void *reply, size_t size)
1071 {
1072         union iucv_param *parm;
1073         int rc;
1074
1075         local_bh_disable();
1076         parm = iucv_param[smp_processor_id()];
1077         memset(parm, 0, sizeof(union iucv_param));
1078         if (flags & IUCV_IPRMDATA) {
1079                 parm->dpl.ippathid = path->pathid;
1080                 parm->dpl.ipflags1 = flags;
1081                 parm->dpl.ipmsgid = msg->id;
1082                 parm->dpl.iptrgcls = msg->class;
1083                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1084         } else {
1085                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1086                 parm->db.ipbfln1f = (u32) size;
1087                 parm->db.ippathid = path->pathid;
1088                 parm->db.ipflags1 = flags;
1089                 parm->db.ipmsgid = msg->id;
1090                 parm->db.iptrgcls = msg->class;
1091         }
1092         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1093         local_bh_enable();
1094         return rc;
1095 }
1096 EXPORT_SYMBOL(iucv_message_reply);
1097
1098 /**
1099  * iucv_message_send
1100  * @path: address of iucv path structure
1101  * @msg: address of iucv msg structure
1102  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1103  * @srccls: source class of message
1104  * @buffer: address of send buffer or address of struct iucv_array
1105  * @size: length of send buffer
1106  *
1107  * This function transmits data to another application. Data to be
1108  * transmitted is in a buffer and this is a one-way message and the
1109  * receiver will not reply to the message.
1110  *
1111  * Returns the result from the CP IUCV call.
1112  */
1113 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1114                       u8 flags, u32 srccls, void *buffer, size_t size)
1115 {
1116         union iucv_param *parm;
1117         int rc;
1118
1119         local_bh_disable();
1120         parm = iucv_param[smp_processor_id()];
1121         memset(parm, 0, sizeof(union iucv_param));
1122         if (flags & IUCV_IPRMDATA) {
1123                 /* Message of 8 bytes can be placed into the parameter list. */
1124                 parm->dpl.ippathid = path->pathid;
1125                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1126                 parm->dpl.iptrgcls = msg->class;
1127                 parm->dpl.ipsrccls = srccls;
1128                 parm->dpl.ipmsgtag = msg->tag;
1129                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1130         } else {
1131                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1132                 parm->db.ipbfln1f = (u32) size;
1133                 parm->db.ippathid = path->pathid;
1134                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1135                 parm->db.iptrgcls = msg->class;
1136                 parm->db.ipsrccls = srccls;
1137                 parm->db.ipmsgtag = msg->tag;
1138         }
1139         rc = iucv_call_b2f0(IUCV_SEND, parm);
1140         if (!rc)
1141                 msg->id = parm->db.ipmsgid;
1142         local_bh_enable();
1143         return rc;
1144 }
1145 EXPORT_SYMBOL(iucv_message_send);
1146
1147 /**
1148  * iucv_message_send2way
1149  * @path: address of iucv path structure
1150  * @msg: address of iucv msg structure
1151  * @flags: how the message is sent and the reply is received
1152  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1153  * @srccls: source class of message
1154  * @buffer: address of send buffer or address of struct iucv_array
1155  * @size: length of send buffer
1156  * @ansbuf: address of answer buffer or address of struct iucv_array
1157  * @asize: size of reply buffer
1158  *
1159  * This function transmits data to another application. Data to be
1160  * transmitted is in a buffer. The receiver of the send is expected to
1161  * reply to the message and a buffer is provided into which IUCV moves
1162  * the reply to this message.
1163  *
1164  * Returns the result from the CP IUCV call.
1165  */
1166 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1167                           u8 flags, u32 srccls, void *buffer, size_t size,
1168                           void *answer, size_t asize, size_t *residual)
1169 {
1170         union iucv_param *parm;
1171         int rc;
1172
1173         local_bh_disable();
1174         parm = iucv_param[smp_processor_id()];
1175         memset(parm, 0, sizeof(union iucv_param));
1176         if (flags & IUCV_IPRMDATA) {
1177                 parm->dpl.ippathid = path->pathid;
1178                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1179                 parm->dpl.iptrgcls = msg->class;
1180                 parm->dpl.ipsrccls = srccls;
1181                 parm->dpl.ipmsgtag = msg->tag;
1182                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1183                 parm->dpl.ipbfln2f = (u32) asize;
1184                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1185         } else {
1186                 parm->db.ippathid = path->pathid;
1187                 parm->db.ipflags1 = path->flags;        /* priority message */
1188                 parm->db.iptrgcls = msg->class;
1189                 parm->db.ipsrccls = srccls;
1190                 parm->db.ipmsgtag = msg->tag;
1191                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1192                 parm->db.ipbfln1f = (u32) size;
1193                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1194                 parm->db.ipbfln2f = (u32) asize;
1195         }
1196         rc = iucv_call_b2f0(IUCV_SEND, parm);
1197         if (!rc)
1198                 msg->id = parm->db.ipmsgid;
1199         local_bh_enable();
1200         return rc;
1201 }
1202 EXPORT_SYMBOL(iucv_message_send2way);
1203
1204 /**
1205  * iucv_path_pending
1206  * @data: Pointer to external interrupt buffer
1207  *
1208  * Process connection pending work item. Called from tasklet while holding
1209  * iucv_table_lock.
1210  */
1211 struct iucv_path_pending {
1212         u16 ippathid;
1213         u8  ipflags1;
1214         u8  iptype;
1215         u16 ipmsglim;
1216         u16 res1;
1217         u8  ipvmid[8];
1218         u8  ipuser[16];
1219         u32 res3;
1220         u8  ippollfg;
1221         u8  res4[3];
1222 } __attribute__ ((packed));
1223
1224 static void iucv_path_pending(struct iucv_irq_data *data)
1225 {
1226         struct iucv_path_pending *ipp = (void *) data;
1227         struct iucv_handler *handler;
1228         struct iucv_path *path;
1229         char *error;
1230
1231         BUG_ON(iucv_path_table[ipp->ippathid]);
1232         /* New pathid, handler found. Create a new path struct. */
1233         error = iucv_error_no_memory;
1234         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1235         if (!path)
1236                 goto out_sever;
1237         path->pathid = ipp->ippathid;
1238         iucv_path_table[path->pathid] = path;
1239         EBCASC(ipp->ipvmid, 8);
1240
1241         /* Call registered handler until one is found that wants the path. */
1242         list_for_each_entry(handler, &iucv_handler_list, list) {
1243                 if (!handler->path_pending)
1244                         continue;
1245                 /*
1246                  * Add path to handler to allow a call to iucv_path_sever
1247                  * inside the path_pending function. If the handler returns
1248                  * an error remove the path from the handler again.
1249                  */
1250                 list_add(&path->list, &handler->paths);
1251                 path->handler = handler;
1252                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1253                         return;
1254                 list_del(&path->list);
1255                 path->handler = NULL;
1256         }
1257         /* No handler wanted the path. */
1258         iucv_path_table[path->pathid] = NULL;
1259         iucv_path_free(path);
1260         error = iucv_error_no_listener;
1261 out_sever:
1262         iucv_sever_pathid(ipp->ippathid, error);
1263 }
1264
1265 /**
1266  * iucv_path_complete
1267  * @data: Pointer to external interrupt buffer
1268  *
1269  * Process connection complete work item. Called from tasklet while holding
1270  * iucv_table_lock.
1271  */
1272 struct iucv_path_complete {
1273         u16 ippathid;
1274         u8  ipflags1;
1275         u8  iptype;
1276         u16 ipmsglim;
1277         u16 res1;
1278         u8  res2[8];
1279         u8  ipuser[16];
1280         u32 res3;
1281         u8  ippollfg;
1282         u8  res4[3];
1283 } __attribute__ ((packed));
1284
1285 static void iucv_path_complete(struct iucv_irq_data *data)
1286 {
1287         struct iucv_path_complete *ipc = (void *) data;
1288         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1289
1290         if (path && path->handler && path->handler->path_complete)
1291                 path->handler->path_complete(path, ipc->ipuser);
1292 }
1293
1294 /**
1295  * iucv_path_severed
1296  * @data: Pointer to external interrupt buffer
1297  *
1298  * Process connection severed work item. Called from tasklet while holding
1299  * iucv_table_lock.
1300  */
1301 struct iucv_path_severed {
1302         u16 ippathid;
1303         u8  res1;
1304         u8  iptype;
1305         u32 res2;
1306         u8  res3[8];
1307         u8  ipuser[16];
1308         u32 res4;
1309         u8  ippollfg;
1310         u8  res5[3];
1311 } __attribute__ ((packed));
1312
1313 static void iucv_path_severed(struct iucv_irq_data *data)
1314 {
1315         struct iucv_path_severed *ips = (void *) data;
1316         struct iucv_path *path = iucv_path_table[ips->ippathid];
1317
1318         if (!path || !path->handler)    /* Already severed */
1319                 return;
1320         if (path->handler->path_severed)
1321                 path->handler->path_severed(path, ips->ipuser);
1322         else {
1323                 iucv_sever_pathid(path->pathid, NULL);
1324                 iucv_path_table[path->pathid] = NULL;
1325                 list_del_init(&path->list);
1326                 iucv_path_free(path);
1327         }
1328 }
1329
1330 /**
1331  * iucv_path_quiesced
1332  * @data: Pointer to external interrupt buffer
1333  *
1334  * Process connection quiesced work item. Called from tasklet while holding
1335  * iucv_table_lock.
1336  */
1337 struct iucv_path_quiesced {
1338         u16 ippathid;
1339         u8  res1;
1340         u8  iptype;
1341         u32 res2;
1342         u8  res3[8];
1343         u8  ipuser[16];
1344         u32 res4;
1345         u8  ippollfg;
1346         u8  res5[3];
1347 } __attribute__ ((packed));
1348
1349 static void iucv_path_quiesced(struct iucv_irq_data *data)
1350 {
1351         struct iucv_path_quiesced *ipq = (void *) data;
1352         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1353
1354         if (path && path->handler && path->handler->path_quiesced)
1355                 path->handler->path_quiesced(path, ipq->ipuser);
1356 }
1357
1358 /**
1359  * iucv_path_resumed
1360  * @data: Pointer to external interrupt buffer
1361  *
1362  * Process connection resumed work item. Called from tasklet while holding
1363  * iucv_table_lock.
1364  */
1365 struct iucv_path_resumed {
1366         u16 ippathid;
1367         u8  res1;
1368         u8  iptype;
1369         u32 res2;
1370         u8  res3[8];
1371         u8  ipuser[16];
1372         u32 res4;
1373         u8  ippollfg;
1374         u8  res5[3];
1375 } __attribute__ ((packed));
1376
1377 static void iucv_path_resumed(struct iucv_irq_data *data)
1378 {
1379         struct iucv_path_resumed *ipr = (void *) data;
1380         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1381
1382         if (path && path->handler && path->handler->path_resumed)
1383                 path->handler->path_resumed(path, ipr->ipuser);
1384 }
1385
1386 /**
1387  * iucv_message_complete
1388  * @data: Pointer to external interrupt buffer
1389  *
1390  * Process message complete work item. Called from tasklet while holding
1391  * iucv_table_lock.
1392  */
1393 struct iucv_message_complete {
1394         u16 ippathid;
1395         u8  ipflags1;
1396         u8  iptype;
1397         u32 ipmsgid;
1398         u32 ipaudit;
1399         u8  iprmmsg[8];
1400         u32 ipsrccls;
1401         u32 ipmsgtag;
1402         u32 res;
1403         u32 ipbfln2f;
1404         u8  ippollfg;
1405         u8  res2[3];
1406 } __attribute__ ((packed));
1407
1408 static void iucv_message_complete(struct iucv_irq_data *data)
1409 {
1410         struct iucv_message_complete *imc = (void *) data;
1411         struct iucv_path *path = iucv_path_table[imc->ippathid];
1412         struct iucv_message msg;
1413
1414         if (path && path->handler && path->handler->message_complete) {
1415                 msg.flags = imc->ipflags1;
1416                 msg.id = imc->ipmsgid;
1417                 msg.audit = imc->ipaudit;
1418                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1419                 msg.class = imc->ipsrccls;
1420                 msg.tag = imc->ipmsgtag;
1421                 msg.length = imc->ipbfln2f;
1422                 path->handler->message_complete(path, &msg);
1423         }
1424 }
1425
1426 /**
1427  * iucv_message_pending
1428  * @data: Pointer to external interrupt buffer
1429  *
1430  * Process message pending work item. Called from tasklet while holding
1431  * iucv_table_lock.
1432  */
1433 struct iucv_message_pending {
1434         u16 ippathid;
1435         u8  ipflags1;
1436         u8  iptype;
1437         u32 ipmsgid;
1438         u32 iptrgcls;
1439         union {
1440                 u32 iprmmsg1_u32;
1441                 u8  iprmmsg1[4];
1442         } ln1msg1;
1443         union {
1444                 u32 ipbfln1f;
1445                 u8  iprmmsg2[4];
1446         } ln1msg2;
1447         u32 res1[3];
1448         u32 ipbfln2f;
1449         u8  ippollfg;
1450         u8  res2[3];
1451 } __attribute__ ((packed));
1452
1453 static void iucv_message_pending(struct iucv_irq_data *data)
1454 {
1455         struct iucv_message_pending *imp = (void *) data;
1456         struct iucv_path *path = iucv_path_table[imp->ippathid];
1457         struct iucv_message msg;
1458
1459         if (path && path->handler && path->handler->message_pending) {
1460                 msg.flags = imp->ipflags1;
1461                 msg.id = imp->ipmsgid;
1462                 msg.class = imp->iptrgcls;
1463                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1464                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1465                         msg.length = 8;
1466                 } else
1467                         msg.length = imp->ln1msg2.ipbfln1f;
1468                 msg.reply_size = imp->ipbfln2f;
1469                 path->handler->message_pending(path, &msg);
1470         }
1471 }
1472
1473 /**
1474  * iucv_tasklet_fn:
1475  *
1476  * This tasklet loops over the queue of irq buffers created by
1477  * iucv_external_interrupt, calls the appropriate action handler
1478  * and then frees the buffer.
1479  */
1480 static void iucv_tasklet_fn(unsigned long ignored)
1481 {
1482         typedef void iucv_irq_fn(struct iucv_irq_data *);
1483         static iucv_irq_fn *irq_fn[] = {
1484                 [0x02] = iucv_path_complete,
1485                 [0x03] = iucv_path_severed,
1486                 [0x04] = iucv_path_quiesced,
1487                 [0x05] = iucv_path_resumed,
1488                 [0x06] = iucv_message_complete,
1489                 [0x07] = iucv_message_complete,
1490                 [0x08] = iucv_message_pending,
1491                 [0x09] = iucv_message_pending,
1492         };
1493         LIST_HEAD(task_queue);
1494         struct iucv_irq_list *p, *n;
1495
1496         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1497         if (!spin_trylock(&iucv_table_lock)) {
1498                 tasklet_schedule(&iucv_tasklet);
1499                 return;
1500         }
1501         iucv_active_cpu = smp_processor_id();
1502
1503         spin_lock_irq(&iucv_queue_lock);
1504         list_splice_init(&iucv_task_queue, &task_queue);
1505         spin_unlock_irq(&iucv_queue_lock);
1506
1507         list_for_each_entry_safe(p, n, &task_queue, list) {
1508                 list_del_init(&p->list);
1509                 irq_fn[p->data.iptype](&p->data);
1510                 kfree(p);
1511         }
1512
1513         iucv_active_cpu = -1;
1514         spin_unlock(&iucv_table_lock);
1515 }
1516
1517 /**
1518  * iucv_work_fn:
1519  *
1520  * This work function loops over the queue of path pending irq blocks
1521  * created by iucv_external_interrupt, calls the appropriate action
1522  * handler and then frees the buffer.
1523  */
1524 static void iucv_work_fn(struct work_struct *work)
1525 {
1526         typedef void iucv_irq_fn(struct iucv_irq_data *);
1527         LIST_HEAD(work_queue);
1528         struct iucv_irq_list *p, *n;
1529
1530         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1531         spin_lock_bh(&iucv_table_lock);
1532         iucv_active_cpu = smp_processor_id();
1533
1534         spin_lock_irq(&iucv_queue_lock);
1535         list_splice_init(&iucv_work_queue, &work_queue);
1536         spin_unlock_irq(&iucv_queue_lock);
1537
1538         iucv_cleanup_queue();
1539         list_for_each_entry_safe(p, n, &work_queue, list) {
1540                 list_del_init(&p->list);
1541                 iucv_path_pending(&p->data);
1542                 kfree(p);
1543         }
1544
1545         iucv_active_cpu = -1;
1546         spin_unlock_bh(&iucv_table_lock);
1547 }
1548
1549 /**
1550  * iucv_external_interrupt
1551  * @code: irq code
1552  *
1553  * Handles external interrupts coming in from CP.
1554  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1555  */
1556 static void iucv_external_interrupt(u16 code)
1557 {
1558         struct iucv_irq_data *p;
1559         struct iucv_irq_list *work;
1560
1561         p = iucv_irq_data[smp_processor_id()];
1562         if (p->ippathid >= iucv_max_pathid) {
1563                 printk(KERN_WARNING "iucv_do_int: Got interrupt with "
1564                        "pathid %d > max_connections (%ld)\n",
1565                        p->ippathid, iucv_max_pathid - 1);
1566                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1567                 return;
1568         }
1569         if (p->iptype  < 0x01 || p->iptype > 0x09) {
1570                 printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
1571                 return;
1572         }
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         rc = bus_register(&iucv_bus);
1613         if (rc)
1614                 goto out_int;
1615         iucv_root = s390_root_dev_register("iucv");
1616         if (IS_ERR(iucv_root)) {
1617                 rc = PTR_ERR(iucv_root);
1618                 goto out_bus;
1619         }
1620
1621         for_each_online_cpu(cpu) {
1622                 /* Note: GFP_DMA used to get memory below 2G */
1623                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1624                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1625                 if (!iucv_irq_data[cpu]) {
1626                         rc = -ENOMEM;
1627                         goto out_free;
1628                 }
1629
1630                 /* Allocate parameter blocks. */
1631                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1632                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1633                 if (!iucv_param[cpu]) {
1634                         rc = -ENOMEM;
1635                         goto out_free;
1636                 }
1637         }
1638         register_hotcpu_notifier(&iucv_cpu_notifier);
1639         ASCEBC(iucv_error_no_listener, 16);
1640         ASCEBC(iucv_error_no_memory, 16);
1641         ASCEBC(iucv_error_pathid, 16);
1642         iucv_available = 1;
1643         return 0;
1644
1645 out_free:
1646         for_each_possible_cpu(cpu) {
1647                 kfree(iucv_param[cpu]);
1648                 iucv_param[cpu] = NULL;
1649                 kfree(iucv_irq_data[cpu]);
1650                 iucv_irq_data[cpu] = NULL;
1651         }
1652         s390_root_dev_unregister(iucv_root);
1653 out_bus:
1654         bus_unregister(&iucv_bus);
1655 out_int:
1656         unregister_external_interrupt(0x4000, iucv_external_interrupt);
1657 out:
1658         return rc;
1659 }
1660
1661 /**
1662  * iucv_exit
1663  *
1664  * Frees everything allocated from iucv_init.
1665  */
1666 static void __exit iucv_exit(void)
1667 {
1668         struct iucv_irq_list *p, *n;
1669         int cpu;
1670
1671         spin_lock_irq(&iucv_queue_lock);
1672         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1673                 kfree(p);
1674         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1675                 kfree(p);
1676         spin_unlock_irq(&iucv_queue_lock);
1677         unregister_hotcpu_notifier(&iucv_cpu_notifier);
1678         for_each_possible_cpu(cpu) {
1679                 kfree(iucv_param[cpu]);
1680                 iucv_param[cpu] = NULL;
1681                 kfree(iucv_irq_data[cpu]);
1682                 iucv_irq_data[cpu] = NULL;
1683         }
1684         s390_root_dev_unregister(iucv_root);
1685         bus_unregister(&iucv_bus);
1686         unregister_external_interrupt(0x4000, iucv_external_interrupt);
1687 }
1688
1689 subsys_initcall(iucv_init);
1690 module_exit(iucv_exit);
1691
1692 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1693 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1694 MODULE_LICENSE("GPL");