linux/net/iucv/iucv.c
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   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
  71static int iucv_bus_match(struct device *dev, struct device_driver *drv)
  72{
  73        return 0;
  74}
  75
  76struct bus_type iucv_bus = {
  77        .name = "iucv",
  78        .match = iucv_bus_match,
  79};
  80EXPORT_SYMBOL(iucv_bus);
  81
  82struct device *iucv_root;
  83EXPORT_SYMBOL(iucv_root);
  84
  85static int iucv_available;
  86
  87/* General IUCV interrupt structure */
  88struct iucv_irq_data {
  89        u16 ippathid;
  90        u8  ipflags1;
  91        u8  iptype;
  92        u32 res2[8];
  93};
  94
  95struct iucv_irq_list {
  96        struct list_head list;
  97        struct iucv_irq_data data;
  98};
  99
 100static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
 101static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
 102static 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 */
 108static LIST_HEAD(iucv_task_queue);
 109
 110/*
 111 * The tasklet for fast delivery of iucv interrupts.
 112 */
 113static void iucv_tasklet_fn(unsigned long);
 114static 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 */
 120static LIST_HEAD(iucv_work_queue);
 121
 122/*
 123 * The work element to deliver path pending interrupts.
 124 */
 125static void iucv_work_fn(struct work_struct *work);
 126static DECLARE_WORK(iucv_work, iucv_work_fn);
 127
 128/*
 129 * Spinlock protecting task and work queue.
 130 */
 131static DEFINE_SPINLOCK(iucv_queue_lock);
 132
 133enum 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 */
 154static char iucv_error_no_listener[16] = "NO LISTENER";
 155static char iucv_error_no_memory[16] = "NO MEMORY";
 156static char iucv_error_pathid[16] = "INVALID PATHID";
 157
 158/*
 159 * iucv_handler_list: List of registered handlers.
 160 */
 161static LIST_HEAD(iucv_handler_list);
 162
 163/*
 164 * iucv_path_table: an array of iucv_path structures.
 165 */
 166static struct iucv_path **iucv_path_table;
 167static unsigned long iucv_max_pathid;
 168
 169/*
 170 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
 171 */
 172static 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 */
 178static int iucv_active_cpu = -1;
 179
 180/*
 181 * Mutex and wait queue for iucv_register/iucv_unregister.
 182 */
 183static DEFINE_MUTEX(iucv_register_mutex);
 184
 185/*
 186 * Counter for number of non-smp capable handlers.
 187 */
 188static 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 */
 194struct 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 */
 209struct 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 */
 228struct 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 */
 246struct 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 */
 262struct iucv_cmd_set_mask {
 263        u8  ipmask;
 264        u8  res1[2];
 265        u8  iprcode;
 266        u32 res2[9];
 267} __attribute__ ((packed,aligned(8)));
 268
 269union 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 */
 280static 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 */
 291static 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 */
 316static 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 */
 345static 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 */
 374static 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 */
 394static 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 */
 449static 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 */
 473static 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 */
 492static 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 */
 512static 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
 533out_path:
 534        kfree(iucv_path_table);
 535out:
 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 */
 546static void iucv_disable(void)
 547{
 548        on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
 549        kfree(iucv_path_table);
 550}
 551
 552static 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
 601static 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 */
 612static 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 */
 631static 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 */
 642static 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 */
 677int 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;
 698out_mutex:
 699        mutex_unlock(&iucv_register_mutex);
 700        return rc;
 701}
 702EXPORT_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 */
 711void 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}
 735EXPORT_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 */
 749int 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}
 774EXPORT_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 */
 791int 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}
 838EXPORT_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 */
 850int 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}
 865EXPORT_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 */
 877int 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 */
 902int 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}
 919EXPORT_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 */
 931int 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}
 952EXPORT_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 */
 969int 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}
1023EXPORT_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 */
1036int 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}
1052EXPORT_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 */
1069int 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}
1096EXPORT_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 */
1113int 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}
1145EXPORT_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 */
1166int 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}
1202EXPORT_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 */
1211struct 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
1224static 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;
1261out_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 */
1272struct 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
1285static 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 */
1301struct 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
1313static 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 */
1337struct 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
1349static 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 */
1365struct 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
1377static 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 */
1393struct 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
1408static 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 */
1433struct 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
1453static 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 */
1480static 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 */
1524static 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 */
1556static 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 */
1597static 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
1645out_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);
1653out_bus:
1654        bus_unregister(&iucv_bus);
1655out_int:
1656        unregister_external_interrupt(0x4000, iucv_external_interrupt);
1657out:
1658        return rc;
1659}
1660
1661/**
1662 * iucv_exit
1663 *
1664 * Frees everything allocated from iucv_init.
1665 */
1666static 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
1689subsys_initcall(iucv_init);
1690module_exit(iucv_exit);
1691
1692MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1693MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1694MODULE_LICENSE("GPL");
1695
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