iucv.c 67.2 KB
Newer Older
L
Linus Torvalds 已提交
1
/* 
2
 * $Id: iucv.c,v 1.47 2005/11/21 11:35:22 mschwide Exp $
L
Linus Torvalds 已提交
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
 *
 * IUCV network driver
 *
 * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
 * Author(s):
 *    Original source:
 *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
 *      Xenia Tkatschow (xenia@us.ibm.com)
 *    2Gb awareness and general cleanup:
 *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
 *
 * Documentation used:
 *    The original source
 *    CP Programming Service, IBM document # SC24-5760
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
32
 * RELEASE-TAG: IUCV lowlevel driver $Revision: 1.47 $
L
Linus Torvalds 已提交
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
 *
 */

/* #define DEBUG */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/config.h>

#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/device.h>
#include <asm/atomic.h>
#include "iucv.h"
#include <asm/io.h>
#include <asm/s390_ext.h>
#include <asm/ebcdic.h>
#include <asm/smp.h>
#include <asm/ccwdev.h> //for root device stuff

/* FLAGS:
 * All flags are defined in the field IPFLAGS1 of each function
 * and can be found in CP Programming Services.
 * IPSRCCLS - Indicates you have specified a source class
 * IPFGMCL  - Indicates you have specified a target class
 * IPFGPID  - Indicates you have specified a pathid
 * IPFGMID  - Indicates you have specified a message ID
 * IPANSLST - Indicates that you are using an address list for
 *            reply data
 * IPBUFLST - Indicates that you are using an address list for
 *            message data
 */

#define IPSRCCLS 	0x01
#define IPFGMCL         0x01
#define IPFGPID         0x02
#define IPFGMID         0x04
#define IPANSLST        0x08
#define IPBUFLST        0x40

static int
iucv_bus_match (struct device *dev, struct device_driver *drv)
{
	return 0;
}

struct bus_type iucv_bus = {
	.name = "iucv",
	.match = iucv_bus_match,
};	

struct device *iucv_root;

/* General IUCV interrupt structure */
typedef struct {
	__u16 ippathid;
	__u8  res1;
	__u8  iptype;
	__u32 res2;
	__u8  ipvmid[8];
	__u8  res3[24];
} iucv_GeneralInterrupt;

static iucv_GeneralInterrupt *iucv_external_int_buffer = NULL;

/* Spin Lock declaration */

static DEFINE_SPINLOCK(iucv_lock);

static int messagesDisabled = 0;

/***************INTERRUPT HANDLING ***************/

typedef struct {
	struct list_head queue;
	iucv_GeneralInterrupt data;
} iucv_irqdata;

static struct list_head  iucv_irq_queue;
static DEFINE_SPINLOCK(iucv_irq_queue_lock);

/*
 *Internal function prototypes
 */
static void iucv_tasklet_handler(unsigned long);
static void iucv_irq_handler(struct pt_regs *, __u16);

static DECLARE_TASKLET(iucv_tasklet,iucv_tasklet_handler,0);

/************ FUNCTION ID'S ****************************/

#define ACCEPT          10
#define CONNECT         11
#define DECLARE_BUFFER  12
#define PURGE           9
#define QUERY           0
#define QUIESCE         13
#define RECEIVE         5
#define REJECT          8
#define REPLY           6
#define RESUME          14
#define RETRIEVE_BUFFER 2
#define SEND            4
#define SETMASK         16
#define SEVER           15

/**
 * Structure: handler
 * members: list - list management.
 *          structure: id
 *             userid - 8 char array of machine identification
 *             user_data - 16 char array for user identification
 *             mask - 24 char array used to compare the 2 previous
 *          interrupt_table - vector of interrupt functions.
 *          pgm_data -  ulong, application data that is passed
 *                      to the interrupt handlers
*/
typedef struct handler_t {
	struct list_head list;
	struct {
		__u8 userid[8];
		__u8 user_data[16];
		__u8 mask[24];
	}                    id;
	iucv_interrupt_ops_t *interrupt_table;
	void                 *pgm_data;
} handler;

/**
 * iucv_handler_table: List of registered handlers.
 */
static struct list_head iucv_handler_table;

/**
 * iucv_pathid_table: an array of *handler pointing into
 *                    iucv_handler_table for fast indexing by pathid;
 */
static handler **iucv_pathid_table;

static unsigned long max_connections;

/**
 * iucv_cpuid: contains the logical cpu number of the cpu which
 * has declared the iucv buffer by issuing DECLARE_BUFFER.
 * If no cpu has done the initialization iucv_cpuid contains -1.
 */
static int iucv_cpuid = -1;
/**
 * register_flag: is 0 when external interrupt has not been registered
 */
static int register_flag;

/****************FIVE 40-BYTE PARAMETER STRUCTURES******************/
/* Data struct 1: iparml_control
 * Used for iucv_accept
 *          iucv_connect
 *          iucv_quiesce
 *          iucv_resume
 *          iucv_sever
 *          iucv_retrieve_buffer
 * Data struct 2: iparml_dpl     (data in parameter list)
 * Used for iucv_send_prmmsg
 *          iucv_send2way_prmmsg
 *          iucv_send2way_prmmsg_array
 *          iucv_reply_prmmsg
 * Data struct 3: iparml_db       (data in a buffer)
 * Used for iucv_receive
 *          iucv_receive_array
 *          iucv_reject
 *          iucv_reply
 *          iucv_reply_array
 *          iucv_send
 *          iucv_send_array
 *          iucv_send2way
 *          iucv_send2way_array
 *          iucv_declare_buffer
 * Data struct 4: iparml_purge
 * Used for iucv_purge
 *          iucv_query
 * Data struct 5: iparml_set_mask
 * Used for iucv_set_mask
 */

typedef struct {
	__u16 ippathid;
	__u8  ipflags1;
	__u8  iprcode;
	__u16 ipmsglim;
	__u16 res1;
	__u8  ipvmid[8];
	__u8  ipuser[16];
	__u8  iptarget[8];
} iparml_control;

typedef struct {
	__u16 ippathid;
	__u8  ipflags1;
	__u8  iprcode;
	__u32 ipmsgid;
	__u32 iptrgcls;
	__u8  iprmmsg[8];
	__u32 ipsrccls;
	__u32 ipmsgtag;
	__u32 ipbfadr2;
	__u32 ipbfln2f;
	__u32 res;
} iparml_dpl;

typedef struct {
	__u16 ippathid;
	__u8  ipflags1;
	__u8  iprcode;
	__u32 ipmsgid;
	__u32 iptrgcls;
	__u32 ipbfadr1;
	__u32 ipbfln1f;
	__u32 ipsrccls;
	__u32 ipmsgtag;
	__u32 ipbfadr2;
	__u32 ipbfln2f;
	__u32 res;
} iparml_db;

typedef struct {
	__u16 ippathid;
	__u8  ipflags1;
	__u8  iprcode;
	__u32 ipmsgid;
	__u8  ipaudit[3];
	__u8  res1[5];
	__u32 res2;
	__u32 ipsrccls;
	__u32 ipmsgtag;
	__u32 res3[3];
} iparml_purge;

typedef struct {
	__u8  ipmask;
	__u8  res1[2];
	__u8  iprcode;
	__u32 res2[9];
} iparml_set_mask;

typedef struct {
	union {
		iparml_control  p_ctrl;
		iparml_dpl      p_dpl;
		iparml_db       p_db;
		iparml_purge    p_purge;
		iparml_set_mask p_set_mask;
	} param;
	atomic_t in_use;
	__u32    res;
}  __attribute__ ((aligned(8))) iucv_param;
#define PARAM_POOL_SIZE (PAGE_SIZE / sizeof(iucv_param))

static iucv_param * iucv_param_pool;

MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
MODULE_LICENSE("GPL");

/*
 * Debugging stuff
 *******************************************************************************/


#ifdef DEBUG
static int debuglevel = 0;

module_param(debuglevel, int, 0);
MODULE_PARM_DESC(debuglevel,
 "Specifies the debug level (0=off ... 3=all)");

static void
iucv_dumpit(char *title, void *buf, int len)
{
	int i;
	__u8 *p = (__u8 *)buf;

	if (debuglevel < 3)
		return;

	printk(KERN_DEBUG "%s\n", title);
	printk("  ");
	for (i = 0; i < len; i++) {
		if (!(i % 16) && i != 0)
			printk ("\n  ");
		else if (!(i % 4) && i != 0)
			printk(" ");
		printk("%02X", *p++);
	}
	if (len % 16)
		printk ("\n");
	return;
}
#define iucv_debug(lvl, fmt, args...) \
do { \
	if (debuglevel >= lvl) \
		printk(KERN_DEBUG "%s: " fmt "\n", __FUNCTION__ , ## args); \
} while (0)

#else

#define iucv_debug(lvl, fmt, args...)
#define iucv_dumpit(title, buf, len)

#endif

/*
 * Internal functions
 *******************************************************************************/

/**
 * print start banner
 */
static void
iucv_banner(void)
{
358
	char vbuf[] = "$Revision: 1.47 $";
L
Linus Torvalds 已提交
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449
	char *version = vbuf;

	if ((version = strchr(version, ':'))) {
		char *p = strchr(version + 1, '$');
		if (p)
			*p = '\0';
	} else
		version = " ??? ";
	printk(KERN_INFO
	       "IUCV lowlevel driver Version%s initialized\n", version);
}

/**
 * iucv_init - Initialization
 *
 * Allocates and initializes various data structures.
 */
static int
iucv_init(void)
{
	int ret;

	if (iucv_external_int_buffer)
		return 0;

	if (!MACHINE_IS_VM) {
		printk(KERN_ERR "IUCV: IUCV connection needs VM as base\n");
		return -EPROTONOSUPPORT;
	}

	ret = bus_register(&iucv_bus);
	if (ret) {
		printk(KERN_ERR "IUCV: failed to register bus.\n");
		return ret;
	}

	iucv_root = s390_root_dev_register("iucv");
	if (IS_ERR(iucv_root)) {
		printk(KERN_ERR "IUCV: failed to register iucv root.\n");
		bus_unregister(&iucv_bus);
		return PTR_ERR(iucv_root);
	}

	/* Note: GFP_DMA used used to get memory below 2G */
	iucv_external_int_buffer = kmalloc(sizeof(iucv_GeneralInterrupt),
					   GFP_KERNEL|GFP_DMA);
	if (!iucv_external_int_buffer) {
		printk(KERN_WARNING
		       "%s: Could not allocate external interrupt buffer\n",
		       __FUNCTION__);
		s390_root_dev_unregister(iucv_root);
		bus_unregister(&iucv_bus);
		return -ENOMEM;
	}
	memset(iucv_external_int_buffer, 0, sizeof(iucv_GeneralInterrupt));

	/* Initialize parameter pool */
	iucv_param_pool = kmalloc(sizeof(iucv_param) * PARAM_POOL_SIZE,
				  GFP_KERNEL|GFP_DMA);
	if (!iucv_param_pool) {
		printk(KERN_WARNING "%s: Could not allocate param pool\n",
		       __FUNCTION__);
		kfree(iucv_external_int_buffer);
		iucv_external_int_buffer = NULL;
		s390_root_dev_unregister(iucv_root);
		bus_unregister(&iucv_bus);
		return -ENOMEM;
	}
	memset(iucv_param_pool, 0, sizeof(iucv_param) * PARAM_POOL_SIZE);

	/* Initialize irq queue */
	INIT_LIST_HEAD(&iucv_irq_queue);

	/* Initialize handler table */
	INIT_LIST_HEAD(&iucv_handler_table);

	iucv_banner();
	return 0;
}

/**
 * iucv_exit - De-Initialization
 *
 * Frees everything allocated from iucv_init.
 */
static int iucv_retrieve_buffer (void);

static void
iucv_exit(void)
{
	iucv_retrieve_buffer();
J
Jesper Juhl 已提交
450 451 452 453
	kfree(iucv_external_int_buffer);
	iucv_external_int_buffer = NULL;
	kfree(iucv_param_pool);
	iucv_param_pool = NULL;
L
Linus Torvalds 已提交
454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
	s390_root_dev_unregister(iucv_root);
	bus_unregister(&iucv_bus);
	printk(KERN_INFO "IUCV lowlevel driver unloaded\n");
}

/**
 * grab_param: - Get a parameter buffer from the pre-allocated pool.
 *
 * This function searches for an unused element in the pre-allocated pool
 * of parameter buffers. If one is found, it marks it "in use" and returns
 * a pointer to it. The calling function is responsible for releasing it
 * when it has finished its usage.
 *
 * Returns: A pointer to iucv_param.
 */
static __inline__ iucv_param *
grab_param(void)
{
	iucv_param *ptr;
        static int hint = 0;

	ptr = iucv_param_pool + hint;
	do {
		ptr++;
		if (ptr >= iucv_param_pool + PARAM_POOL_SIZE)
			ptr = iucv_param_pool;
480
	} while (atomic_cmpxchg(&ptr->in_use, 0, 1) != 0);
L
Linus Torvalds 已提交
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555
	hint = ptr - iucv_param_pool;

	memset(&ptr->param, 0, sizeof(ptr->param));
	return ptr;
}

/**
 * release_param - Release a parameter buffer.
 * @p: A pointer to a struct iucv_param, previously obtained by calling
 *     grab_param().
 *
 * This function marks the specified parameter buffer "unused".
 */
static __inline__ void
release_param(void *p)
{
	atomic_set(&((iucv_param *)p)->in_use, 0);
}

/**
 * iucv_add_handler: - Add a new handler
 * @new_handler: handle that is being entered into chain.
 *
 * Places new handle on iucv_handler_table, if identical handler is not
 * found.
 *
 * Returns: 0 on success, !0 on failure (handler already in chain).
 */
static int
iucv_add_handler (handler *new)
{
	ulong flags;

	iucv_debug(1, "entering");
	iucv_dumpit("handler:", new, sizeof(handler));

	spin_lock_irqsave (&iucv_lock, flags);
	if (!list_empty(&iucv_handler_table)) {
		struct list_head *lh;

		/**
		 * Search list for handler with identical id. If one
		 * is found, the new handler is _not_ added.
		 */
		list_for_each(lh, &iucv_handler_table) {
			handler *h = list_entry(lh, handler, list);
			if (!memcmp(&new->id, &h->id, sizeof(h->id))) {
				iucv_debug(1, "ret 1");
				spin_unlock_irqrestore (&iucv_lock, flags);
				return 1;
			}
		}
	}
	/**
	 * If we get here, no handler was found.
	 */
	INIT_LIST_HEAD(&new->list);
	list_add(&new->list, &iucv_handler_table);
	spin_unlock_irqrestore (&iucv_lock, flags);

	iucv_debug(1, "exiting");
	return 0;
}

/**
 * b2f0:
 * @code: identifier of IUCV call to CP.
 * @parm: pointer to 40 byte iparml area passed to CP
 *
 * Calls CP to execute IUCV commands.
 *
 * Returns: return code from CP's IUCV call
 */
static __inline__ ulong
b2f0(__u32 code, void *parm)
{
	iucv_dumpit("iparml before b2f0 call:", parm, sizeof(iucv_param));

	asm volatile (
		"LRA   1,0(%1)\n\t"
		"LR    0,%0\n\t"
		".long 0xb2f01000"
		:
		: "d" (code), "a" (parm)
		: "0", "1"
		);

	iucv_dumpit("iparml after b2f0 call:", parm, sizeof(iucv_param));

	return (unsigned long)*((__u8 *)(parm + 3));
}

/*
 * Name: iucv_add_pathid
 * Purpose: Adds a path id to the system.
 * Input: pathid -  pathid that is going to be entered into system
 *        handle -  address of handler that the pathid will be associated
 *		   with.
 *        pgm_data - token passed in by application.
 * Output: 0: successful addition of pathid
 *	   - EINVAL - pathid entry is being used by another application
 *	   - ENOMEM - storage allocation for a new pathid table failed
*/
static int
__iucv_add_pathid(__u16 pathid, handler *handler)
{

	iucv_debug(1, "entering");

	iucv_debug(1, "handler is pointing to %p", handler);

	if (pathid > (max_connections - 1))
		return -EINVAL;

	if (iucv_pathid_table[pathid]) {
		iucv_debug(1, "pathid entry is %p", iucv_pathid_table[pathid]);
		printk(KERN_WARNING
		       "%s: Pathid being used, error.\n", __FUNCTION__);
		return -EINVAL;
	}
	iucv_pathid_table[pathid] = handler;

	iucv_debug(1, "exiting");
	return 0;
}				/* end of add_pathid function */

static int
iucv_add_pathid(__u16 pathid, handler *handler)
{
	ulong flags;
	int rc;

	spin_lock_irqsave (&iucv_lock, flags);
	rc = __iucv_add_pathid(pathid, handler);
	spin_unlock_irqrestore (&iucv_lock, flags);
	return rc;
}

static void
iucv_remove_pathid(__u16 pathid)
{
	ulong flags;

	if (pathid > (max_connections - 1))
		return;

	spin_lock_irqsave (&iucv_lock, flags);
	iucv_pathid_table[pathid] = NULL;
	spin_unlock_irqrestore (&iucv_lock, flags);
}

/**
 * iucv_declare_buffer_cpuid
 * Register at VM for subsequent IUCV operations. This is executed
 * on the reserved CPU iucv_cpuid. Called from iucv_declare_buffer().
 */
static void
iucv_declare_buffer_cpuid (void *result)
{
	iparml_db *parm;

	parm = (iparml_db *)grab_param();
	parm->ipbfadr1 = virt_to_phys(iucv_external_int_buffer);
	if ((*((ulong *)result) = b2f0(DECLARE_BUFFER, parm)) == 1)
		*((ulong *)result) = parm->iprcode;
	release_param(parm);
}

/**
 * iucv_retrieve_buffer_cpuid:
 * Unregister IUCV usage at VM. This is always executed on the same
 * cpu that registered the buffer to VM.
 * Called from iucv_retrieve_buffer().
 */
static void
iucv_retrieve_buffer_cpuid (void *cpu)
{
	iparml_control *parm;

	parm = (iparml_control *)grab_param();
	b2f0(RETRIEVE_BUFFER, parm);
	release_param(parm);
}

/**
 * Name: iucv_declare_buffer
 * Purpose: Specifies the guests real address of an external
 *          interrupt.
 * Input: void
 * Output: iprcode - return code from b2f0 call
 */
static int
iucv_declare_buffer (void)
{
	unsigned long flags;
	ulong b2f0_result;

	iucv_debug(1, "entering");
	b2f0_result = -ENODEV;
	spin_lock_irqsave (&iucv_lock, flags);
	if (iucv_cpuid == -1) {
		/* Reserve any cpu for use by iucv. */
		iucv_cpuid = smp_get_cpu(CPU_MASK_ALL);
		spin_unlock_irqrestore (&iucv_lock, flags);
		smp_call_function_on(iucv_declare_buffer_cpuid,
			&b2f0_result, 0, 1, iucv_cpuid);
		if (b2f0_result) {
			smp_put_cpu(iucv_cpuid);
			iucv_cpuid = -1;
		}
		iucv_debug(1, "Address of EIB = %p", iucv_external_int_buffer);
	} else {
		spin_unlock_irqrestore (&iucv_lock, flags);
		b2f0_result = 0;
	}
	iucv_debug(1, "exiting");
	return b2f0_result;
}

/**
 * iucv_retrieve_buffer:
 *
 * Terminates all use of IUCV.
 * Returns: return code from CP
 */
static int
iucv_retrieve_buffer (void)
{
	iucv_debug(1, "entering");
	if (iucv_cpuid != -1) {
		smp_call_function_on(iucv_retrieve_buffer_cpuid,
				     0, 0, 1, iucv_cpuid);
		/* Release the cpu reserved by iucv_declare_buffer. */
		smp_put_cpu(iucv_cpuid);
		iucv_cpuid = -1;
	}
	iucv_debug(1, "exiting");
	return 0;
}

/**
 * iucv_remove_handler:
 * @users_handler: handler to be removed
 *
 * Remove handler when application unregisters.
 */
static void
iucv_remove_handler(handler *handler)
{
	unsigned long flags;

	if ((!iucv_pathid_table) || (!handler))
		return;

	iucv_debug(1, "entering");

	spin_lock_irqsave (&iucv_lock, flags);
	list_del(&handler->list);
	if (list_empty(&iucv_handler_table)) {
		if (register_flag) {
			unregister_external_interrupt(0x4000, iucv_irq_handler);
			register_flag = 0;
		}
	}
	spin_unlock_irqrestore (&iucv_lock, flags);

	iucv_debug(1, "exiting");
	return;
}

/**
 * iucv_register_program:
 * @pgmname:  user identification
 * @userid:   machine identification
 * @pgmmask:  Indicates which bits in the pgmname and userid combined will be
 *            used to determine who is given control.
 * @ops:      Address of interrupt handler table.
 * @pgm_data: Application data to be passed to interrupt handlers.
 *
 * Registers an application with IUCV.
 * Returns:
 *           The address of handler, or NULL on failure.
 * NOTE on pgmmask:
 *   If pgmname, userid and pgmmask are provided, pgmmask is entered into the
 *   handler as is.
 *   If pgmmask is NULL, the internal mask is set to all 0xff's
 *   When userid is NULL, the first 8 bytes of the internal mask are forced
 *   to 0x00.
 *   If pgmmask and userid are NULL, the first 8 bytes of the internal mask
 *   are forced to 0x00 and the last 16 bytes to 0xff.
 */

iucv_handle_t
iucv_register_program (__u8 pgmname[16],
		       __u8 userid[8],
		       __u8 pgmmask[24],
		       iucv_interrupt_ops_t * ops, void *pgm_data)
{
	ulong rc = 0;		/* return code from function calls */
	handler *new_handler;

	iucv_debug(1, "entering");

	if (ops == NULL) {
		/* interrupt table is not defined */
		printk(KERN_WARNING "%s: Interrupt table is not defined, "
		       "exiting\n", __FUNCTION__);
		return NULL;
	}
	if (!pgmname) {
		printk(KERN_WARNING "%s: pgmname not provided\n", __FUNCTION__);
		return NULL;
	}

	/* Allocate handler entry */
	new_handler = (handler *)kmalloc(sizeof(handler), GFP_ATOMIC);
	if (new_handler == NULL) {
		printk(KERN_WARNING "%s: storage allocation for new handler "
		       "failed.\n", __FUNCTION__);
		return NULL;
	}

	if (!iucv_pathid_table) {
		if (iucv_init()) {
			kfree(new_handler);
			return NULL;
		}

		max_connections = iucv_query_maxconn();
		iucv_pathid_table = kmalloc(max_connections * sizeof(handler *),
				       GFP_ATOMIC);
		if (iucv_pathid_table == NULL) {
			printk(KERN_WARNING "%s: iucv_pathid_table storage "
			       "allocation failed\n", __FUNCTION__);
			kfree(new_handler);
			return NULL;
		}
		memset (iucv_pathid_table, 0, max_connections * sizeof(handler *));
	}
	memset(new_handler, 0, sizeof (handler));
	memcpy(new_handler->id.user_data, pgmname,
		sizeof (new_handler->id.user_data));
	if (userid) {
		memcpy (new_handler->id.userid, userid,
			sizeof (new_handler->id.userid));
		ASCEBC (new_handler->id.userid,
			sizeof (new_handler->id.userid));
		EBC_TOUPPER (new_handler->id.userid,
			     sizeof (new_handler->id.userid));
		
		if (pgmmask) {
			memcpy (new_handler->id.mask, pgmmask,
				sizeof (new_handler->id.mask));
		} else {
			memset (new_handler->id.mask, 0xFF,
				sizeof (new_handler->id.mask));
		}
	} else {
		if (pgmmask) {
			memcpy (new_handler->id.mask, pgmmask,
				sizeof (new_handler->id.mask));
		} else {
			memset (new_handler->id.mask, 0xFF,
				sizeof (new_handler->id.mask));
		}
		memset (new_handler->id.userid, 0x00,
			sizeof (new_handler->id.userid));
	}
	/* fill in the rest of handler */
	new_handler->pgm_data = pgm_data;
	new_handler->interrupt_table = ops;

	/*
	 * Check if someone else is registered with same pgmname, userid
	 * and mask. If someone is already registered with same pgmname,
	 * userid and mask, registration will fail and NULL will be returned
	 * to the application.
	 * If identical handler not found, then handler is added to list.
	 */
	rc = iucv_add_handler(new_handler);
	if (rc) {
		printk(KERN_WARNING "%s: Someone already registered with same "
		       "pgmname, userid, pgmmask\n", __FUNCTION__);
		kfree (new_handler);
		return NULL;
	}

	rc = iucv_declare_buffer();
	if (rc) {
		char *err = "Unknown";
		iucv_remove_handler(new_handler);
		kfree(new_handler);
		switch(rc) {
		case 0x03:
			err = "Directory error";
			break;
		case 0x0a:
			err = "Invalid length";
			break;
		case 0x13:
			err = "Buffer already exists";
			break;
		case 0x3e:
			err = "Buffer overlap";
			break;
		case 0x5c:
			err = "Paging or storage error";
			break;
		}
		printk(KERN_WARNING "%s: iucv_declare_buffer "
		       "returned error 0x%02lx (%s)\n", __FUNCTION__, rc, err);
		return NULL;
	}
	if (!register_flag) {
		/* request the 0x4000 external interrupt */
		rc = register_external_interrupt (0x4000, iucv_irq_handler);
		if (rc) {
			iucv_remove_handler(new_handler);
			kfree (new_handler);
			printk(KERN_WARNING "%s: "
			       "register_external_interrupt returned %ld\n",
			       __FUNCTION__, rc);
			return NULL;

		}
		register_flag = 1;
	}
	iucv_debug(1, "exiting");
	return new_handler;
}				/* end of register function */

/**
 * iucv_unregister_program:
 * @handle: address of handler
 *
 * Unregister application with IUCV.
 * Returns:
 *   0 on success, -EINVAL, if specified handle is invalid.
 */

int
iucv_unregister_program (iucv_handle_t handle)
{
	handler *h = NULL;
	struct list_head *lh;
	int i;
	ulong flags;

	iucv_debug(1, "entering");
	iucv_debug(1, "address of handler is %p", h);

	/* Checking if handle is valid  */
	spin_lock_irqsave (&iucv_lock, flags);
	list_for_each(lh, &iucv_handler_table) {
		if ((handler *)handle == list_entry(lh, handler, list)) {
			h = (handler *)handle;
			break;
		}
	}
	if (!h) {
		spin_unlock_irqrestore (&iucv_lock, flags);
		if (handle)
			printk(KERN_WARNING
			       "%s: Handler not found in iucv_handler_table.\n",
			       __FUNCTION__);
		else
			printk(KERN_WARNING
			       "%s: NULL handle passed by application.\n",
			       __FUNCTION__);
		return -EINVAL;
	}

	/**
	 * First, walk thru iucv_pathid_table and sever any pathid which is
	 * still pointing to the handler to be removed.
	 */
	for (i = 0; i < max_connections; i++)
		if (iucv_pathid_table[i] == h) {
			spin_unlock_irqrestore (&iucv_lock, flags);
			iucv_sever(i, h->id.user_data);
			spin_lock_irqsave(&iucv_lock, flags);
		}
	spin_unlock_irqrestore (&iucv_lock, flags);

	iucv_remove_handler(h);
	kfree(h);

	iucv_debug(1, "exiting");
	return 0;
}

/**
 * iucv_accept:
 * @pathid:             Path identification number
 * @msglim_reqstd:      The number of outstanding messages requested.
 * @user_data:          Data specified by the iucv_connect function.
 * @flags1:             Contains options for this path.
 *     - IPPRTY (0x20)   Specifies if you want to send priority message.
 *     - IPRMDATA (0x80) Specifies whether your program can handle a message
 *                       in the parameter list.
 *     - IPQUSCE (0x40)  Specifies whether you want to quiesce the path being
 *		         established.
 * @handle:             Address of handler.
 * @pgm_data:           Application data passed to interrupt handlers.
 * @flags1_out:         Pointer to an int. If not NULL, on return the options for
 *                      the path are stored at the given location:
 *     - IPPRTY (0x20)  Indicates you may send a priority message.
 * @msglim:             Pointer to an __u16. If not NULL, on return the maximum
 *                      number of outstanding messages is stored at the given
 *                      location.
 *
 * This function is issued after the user receives a Connection Pending external
 * interrupt and now wishes to complete the IUCV communication path.
 * Returns:
 *   return code from CP
 */
int
iucv_accept(__u16 pathid, __u16 msglim_reqstd,
	     __u8 user_data[16], int flags1,
	     iucv_handle_t handle, void *pgm_data,
	     int *flags1_out, __u16 * msglim)
{
	ulong b2f0_result = 0;
	ulong flags;
	struct list_head *lh;
	handler *h = NULL;
	iparml_control *parm;

	iucv_debug(1, "entering");
	iucv_debug(1, "pathid = %d", pathid);

	/* Checking if handle is valid  */
	spin_lock_irqsave (&iucv_lock, flags);
	list_for_each(lh, &iucv_handler_table) {
		if ((handler *)handle == list_entry(lh, handler, list)) {
			h = (handler *)handle;
			break;
		}
	}
	spin_unlock_irqrestore (&iucv_lock, flags);

	if (!h) {
		if (handle)
			printk(KERN_WARNING
			       "%s: Handler not found in iucv_handler_table.\n",
			       __FUNCTION__);
		else
			printk(KERN_WARNING
			       "%s: NULL handle passed by application.\n",
			       __FUNCTION__);
		return -EINVAL;
	}

	parm = (iparml_control *)grab_param();

	parm->ippathid = pathid;
	parm->ipmsglim = msglim_reqstd;
	if (user_data)
		memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));

	parm->ipflags1 = (__u8)flags1;
	b2f0_result = b2f0(ACCEPT, parm);

	if (!b2f0_result) {
		if (msglim)
			*msglim = parm->ipmsglim;
		if (pgm_data)
			h->pgm_data = pgm_data;
		if (flags1_out)
			*flags1_out = (parm->ipflags1 & IPPRTY) ? IPPRTY : 0;
	}
	release_param(parm);

	iucv_debug(1, "exiting");
	return b2f0_result;
}

/**
 * iucv_connect:
 * @pathid:        Path identification number
 * @msglim_reqstd: Number of outstanding messages requested
 * @user_data:     16-byte user data
 * @userid:        8-byte of user identification
 * @system_name:   8-byte identifying the system name
 * @flags1:        Specifies options for this path:
 *     - IPPRTY (0x20)   Specifies if you want to send priority message.
 *     - IPRMDATA (0x80) Specifies whether your program can handle a message
 *                       in  the parameter list.
 *     - IPQUSCE (0x40)  Specifies whether you want to quiesce the path being
 *                       established.
 *     - IPLOCAL (0x01)  Allows an application to force the partner to be on the
 *                       local system. If local is specified then target class
 *                       cannot be specified.
 * @flags1_out:    Pointer to an int. If not NULL, on return the options for
 *                 the path are stored at the given location:
 *     - IPPRTY (0x20)   Indicates you may send a priority message.
 * @msglim:        Pointer to an __u16. If not NULL, on return the maximum
 *                 number of outstanding messages is stored at the given
 *                 location.
 * @handle:        Address of handler.
 * @pgm_data:      Application data to be passed to interrupt handlers.
 *
 * This function establishes an IUCV path. Although the connect may complete
 * successfully, you are not able to use the path until you receive an IUCV
 * Connection Complete external interrupt.
 * Returns: return code from CP, or one of the following
 *     - ENOMEM
 *     - return code from iucv_declare_buffer
 *     - EINVAL - invalid handle passed by application
 *     - EINVAL - pathid address is NULL
 *     - ENOMEM - pathid table storage allocation failed
 *     - return code from internal function add_pathid
 */
int
iucv_connect (__u16 *pathid, __u16 msglim_reqstd,
	      __u8 user_data[16], __u8 userid[8],
	      __u8 system_name[8], int flags1,
	      int *flags1_out, __u16 * msglim,
	      iucv_handle_t handle, void *pgm_data)
{
	iparml_control *parm;
	iparml_control local_parm;
	struct list_head *lh;
	ulong b2f0_result = 0;
	ulong flags;
	int add_pathid_result = 0;
	handler *h = NULL;
	__u8 no_memory[16] = "NO MEMORY";

	iucv_debug(1, "entering");

	/* Checking if handle is valid  */
	spin_lock_irqsave (&iucv_lock, flags);
	list_for_each(lh, &iucv_handler_table) {
		if ((handler *)handle == list_entry(lh, handler, list)) {
			h = (handler *)handle;
			break;
		}
	}
	spin_unlock_irqrestore (&iucv_lock, flags);

	if (!h) {
		if (handle)
			printk(KERN_WARNING
			       "%s: Handler not found in iucv_handler_table.\n",
			       __FUNCTION__);
		else
			printk(KERN_WARNING
			       "%s: NULL handle passed by application.\n",
			       __FUNCTION__);
		return -EINVAL;
	}

	if (pathid == NULL) {
		printk(KERN_WARNING "%s: NULL pathid pointer\n",
		       __FUNCTION__);
		return -EINVAL;
	}

	parm = (iparml_control *)grab_param();

	parm->ipmsglim = msglim_reqstd;

	if (user_data)
		memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));

	if (userid) {
		memcpy(parm->ipvmid, userid, sizeof(parm->ipvmid));
		ASCEBC(parm->ipvmid, sizeof(parm->ipvmid));
		EBC_TOUPPER(parm->ipvmid, sizeof(parm->ipvmid));
	}

	if (system_name) {
		memcpy(parm->iptarget, system_name, sizeof(parm->iptarget));
		ASCEBC(parm->iptarget, sizeof(parm->iptarget));
		EBC_TOUPPER(parm->iptarget, sizeof(parm->iptarget));
	}

	/* In order to establish an IUCV connection, the procedure is:
         *
         * b2f0(CONNECT)
         * take the ippathid from the b2f0 call
         * register the handler to the ippathid
         *
         * Unfortunately, the ConnectionEstablished message gets sent after the
         * b2f0(CONNECT) call but before the register is handled.
         *
         * In order for this race condition to be eliminated, the IUCV Control
         * Interrupts must be disabled for the above procedure.
         *
         * David Kennedy <dkennedy@linuxcare.com>
         */

	/* Enable everything but IUCV Control messages */
	iucv_setmask(~(AllInterrupts));
	messagesDisabled = 1;

	spin_lock_irqsave (&iucv_lock, flags);
	parm->ipflags1 = (__u8)flags1;
	b2f0_result = b2f0(CONNECT, parm);
	memcpy(&local_parm, parm, sizeof(local_parm));
	release_param(parm);
	parm = &local_parm;
	if (!b2f0_result)
		add_pathid_result = __iucv_add_pathid(parm->ippathid, h);
	spin_unlock_irqrestore (&iucv_lock, flags);

	if (b2f0_result) {
		iucv_setmask(~0);
		messagesDisabled = 0;
		return b2f0_result;
	}

	*pathid = parm->ippathid;

	/* Enable everything again */
	iucv_setmask(IUCVControlInterruptsFlag);

	if (msglim)
		*msglim = parm->ipmsglim;
	if (flags1_out)
		*flags1_out = (parm->ipflags1 & IPPRTY) ? IPPRTY : 0;

	if (add_pathid_result) {
		iucv_sever(*pathid, no_memory);
		printk(KERN_WARNING "%s: add_pathid failed with rc ="
			" %d\n", __FUNCTION__, add_pathid_result);
		return(add_pathid_result);
	}

	iucv_debug(1, "exiting");
	return b2f0_result;
}

/**
 * iucv_purge:
 * @pathid: Path identification number
 * @msgid:  Message ID of message to purge.
 * @srccls: Message class of the message to purge.
 * @audit:  Pointer to an __u32. If not NULL, on return, information about
 *          asynchronous errors that may have affected the normal completion
 *          of this message ist stored at the given location.
 *
 * Cancels a message you have sent.
 * Returns: return code from CP
 */
int
iucv_purge (__u16 pathid, __u32 msgid, __u32 srccls, __u32 *audit)
{
	iparml_purge *parm;
	ulong b2f0_result = 0;

	iucv_debug(1, "entering");
	iucv_debug(1, "pathid = %d", pathid);

	parm = (iparml_purge *)grab_param();

	parm->ipmsgid = msgid;
	parm->ippathid = pathid;
	parm->ipsrccls = srccls;
	parm->ipflags1 |= (IPSRCCLS | IPFGMID | IPFGPID);
	b2f0_result = b2f0(PURGE, parm);

	if (!b2f0_result && audit) {
		memcpy(audit, parm->ipaudit, sizeof(parm->ipaudit));
		/* parm->ipaudit has only 3 bytes */
		*audit >>= 8;
	}
	
	release_param(parm);

	iucv_debug(1, "b2f0_result = %ld", b2f0_result);
	iucv_debug(1, "exiting");
	return b2f0_result;
}

/**
 * iucv_query_generic:
 * @want_maxconn: Flag, describing which value is to be returned.
 *
 * Helper function for iucv_query_maxconn() and iucv_query_bufsize().
 *
 * Returns: The buffersize, if want_maxconn is 0; the maximum number of
 *           connections, if want_maxconn is 1 or an error-code < 0 on failure.
 */
static int
iucv_query_generic(int want_maxconn)
{
	iparml_purge *parm = (iparml_purge *)grab_param();
	int bufsize, maxconn;
	int ccode;

	/**
	 * Call b2f0 and store R0 (max buffer size),
	 * R1 (max connections) and CC.
	 */
	asm volatile (
		"LRA   1,0(%4)\n\t"
		"LR    0,%3\n\t"
		".long 0xb2f01000\n\t"
		"IPM   %0\n\t"
		"SRL   %0,28\n\t"
		"ST    0,%1\n\t"
		"ST    1,%2\n\t"
		: "=d" (ccode), "=m" (bufsize), "=m" (maxconn)
		: "d" (QUERY), "a" (parm)
		: "0", "1", "cc"
		);
	release_param(parm);

	if (ccode)
		return -EPERM;
	if (want_maxconn)
		return maxconn;
	return bufsize;
}

/**
 * iucv_query_maxconn:
 *
 * Determines the maximum number of connections thay may be established.
 *
 * Returns: Maximum number of connections that can be.
 */
ulong
iucv_query_maxconn(void)
{
	return iucv_query_generic(1);
}

/**
 * iucv_query_bufsize:
 *
 * Determines the size of the external interrupt buffer.
 *
 * Returns: Size of external interrupt buffer.
 */
ulong
iucv_query_bufsize (void)
{
	return iucv_query_generic(0);
}

/**
 * iucv_quiesce:
 * @pathid:    Path identification number
 * @user_data: 16-byte user data
 *
 * Temporarily suspends incoming messages on an IUCV path.
 * You can later reactivate the path by invoking the iucv_resume function.
 * Returns: return code from CP
 */
int
iucv_quiesce (__u16 pathid, __u8 user_data[16])
{
	iparml_control *parm;
	ulong b2f0_result = 0;

	iucv_debug(1, "entering");
	iucv_debug(1, "pathid = %d", pathid);

	parm = (iparml_control *)grab_param();

	memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));
	parm->ippathid = pathid;

	b2f0_result = b2f0(QUIESCE, parm);
	release_param(parm);

	iucv_debug(1, "b2f0_result = %ld", b2f0_result);
	iucv_debug(1, "exiting");

	return b2f0_result;
}

/**
 * iucv_receive:
 * @pathid: Path identification number.
 * @buffer: Address of buffer to receive. Must be below 2G.
 * @buflen: Length of buffer to receive.
 * @msgid:  Specifies the message ID.
 * @trgcls: Specifies target class.
 * @flags1_out: Receives options for path on return.
 *    - IPNORPY (0x10)  Specifies whether a reply is required
 *    - IPPRTY (0x20)   Specifies if you want to send priority message
 *    - IPRMDATA (0x80) Specifies the data is contained in the parameter list
 * @residual_buffer: Receives the address of buffer updated by the number
 *                   of bytes you have received on return.
 * @residual_length: On return, receives one of the following values:
 *    - 0                          If the receive buffer is the same length as
 *                                 the message.
 *    - Remaining bytes in buffer  If the receive buffer is longer than the
 *                                 message.
 *    - Remaining bytes in message If the receive buffer is shorter than the
 *                                 message.
 *
 * This function receives messages that are being sent to you over established
 * paths.
 * Returns: return code from CP IUCV call; If the receive buffer is shorter
 *   than the message, always 5
 *   -EINVAL - buffer address is pointing to NULL
 */
int
iucv_receive (__u16 pathid, __u32 msgid, __u32 trgcls,
	      void *buffer, ulong buflen,
	      int *flags1_out, ulong * residual_buffer, ulong * residual_length)
{
	iparml_db *parm;
	ulong b2f0_result;
	int moved = 0;	/* number of bytes moved from parmlist to buffer */

	iucv_debug(2, "entering");

	if (!buffer)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ipbfadr1 = (__u32) (addr_t) buffer;
	parm->ipbfln1f = (__u32) ((ulong) buflen);
	parm->ipmsgid = msgid;
	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipflags1 = (IPFGPID | IPFGMID | IPFGMCL);

	b2f0_result = b2f0(RECEIVE, parm);

	if (!b2f0_result || b2f0_result == 5) {
		if (flags1_out) {
			iucv_debug(2, "*flags1_out = %d", *flags1_out);
			*flags1_out = (parm->ipflags1 & (~0x07));
			iucv_debug(2, "*flags1_out = %d", *flags1_out);
		}

		if (!(parm->ipflags1 & IPRMDATA)) {	/*msg not in parmlist */
			if (residual_length)
				*residual_length = parm->ipbfln1f;

			if (residual_buffer)
				*residual_buffer = parm->ipbfadr1;
		} else {
			moved = min_t (unsigned long, buflen, 8);

			memcpy ((char *) buffer,
				(char *) &parm->ipbfadr1, moved);

			if (buflen < 8)
				b2f0_result = 5;

			if (residual_length)
				*residual_length = abs (buflen - 8);

			if (residual_buffer)
				*residual_buffer = (ulong) (buffer + moved);
		}
	}
	release_param(parm);

	iucv_debug(2, "exiting");
	return b2f0_result;
}

/*
 * Name: iucv_receive_array
 * Purpose: This function receives messages that are being sent to you
 *          over established paths.
 * Input: pathid - path identification number
 *        buffer - address of array of buffers
 *        buflen - total length of buffers
 *        msgid - specifies the message ID.
 *        trgcls - specifies target class
 * Output:
 *        flags1_out: Options for path.
 *          IPNORPY - 0x10 specifies whether a reply is required
 *          IPPRTY - 0x20 specifies if you want to send priority message
 *         IPRMDATA - 0x80 specifies the data is contained in the parameter list
 *       residual_buffer - address points to the current list entry IUCV
 *                         is working on.
 *       residual_length -
 *              Contains one of the following values, if the receive buffer is:
 *               The same length as the message, this field is zero.
 *               Longer than the message, this field contains the number of
 *                bytes remaining in the buffer.
 *               Shorter than the message, this field contains the residual
 *                count (that is, the number of bytes remaining in the
 *                message that does not fit into the buffer. In this case
 *		  b2f0_result = 5.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - buffer address is NULL
 */
int
iucv_receive_array (__u16 pathid,
		    __u32 msgid, __u32 trgcls,
		    iucv_array_t * buffer, ulong buflen,
		    int *flags1_out,
		    ulong * residual_buffer, ulong * residual_length)
{
	iparml_db *parm;
	ulong b2f0_result;
	int i = 0, moved = 0, need_to_move = 8, dyn_len;

	iucv_debug(2, "entering");

	if (!buffer)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ipbfadr1 = (__u32) ((ulong) buffer);
	parm->ipbfln1f = (__u32) buflen;
	parm->ipmsgid = msgid;
	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipflags1 = (IPBUFLST | IPFGPID | IPFGMID | IPFGMCL);

	b2f0_result = b2f0(RECEIVE, parm);

	if (!b2f0_result || b2f0_result == 5) {

		if (flags1_out) {
			iucv_debug(2, "*flags1_out = %d", *flags1_out);
			*flags1_out = (parm->ipflags1 & (~0x07));
			iucv_debug(2, "*flags1_out = %d", *flags1_out);
		}

		if (!(parm->ipflags1 & IPRMDATA)) {	/*msg not in parmlist */

			if (residual_length)
				*residual_length = parm->ipbfln1f;

			if (residual_buffer)
				*residual_buffer = parm->ipbfadr1;

		} else {
			/* copy msg from parmlist to users array. */

			while ((moved < 8) && (moved < buflen)) {
				dyn_len =
				    min_t (unsigned int,
					 (buffer + i)->length, need_to_move);

				memcpy ((char *)((ulong)((buffer + i)->address)),
					((char *) &parm->ipbfadr1) + moved,
					dyn_len);

				moved += dyn_len;
				need_to_move -= dyn_len;

				(buffer + i)->address =
				    	(__u32)
				((ulong)(__u8 *) ((ulong)(buffer + i)->address)
						+ dyn_len);

				(buffer + i)->length -= dyn_len;
				i++;
			}

			if (need_to_move)	/* buflen < 8 bytes */
				b2f0_result = 5;

			if (residual_length)
				*residual_length = abs (buflen - 8);

			if (residual_buffer) {
				if (!moved)
					*residual_buffer = (ulong) buffer;
				else
					*residual_buffer =
					    (ulong) (buffer + (i - 1));
			}

		}
	}
	release_param(parm);

	iucv_debug(2, "exiting");
	return b2f0_result;
}

/**
 * iucv_reject:
 * @pathid: Path identification number.
 * @msgid:  Message ID of the message to reject.
 * @trgcls: Target class of the message to reject.
 * Returns: return code from CP
 *
 * Refuses a specified message. Between the time you are notified of a
 * message and the time that you complete the message, the message may
 * be rejected.
 */
int
iucv_reject (__u16 pathid, __u32 msgid, __u32 trgcls)
{
	iparml_db *parm;
	ulong b2f0_result = 0;

	iucv_debug(1, "entering");
	iucv_debug(1, "pathid = %d", pathid);

	parm = (iparml_db *)grab_param();

	parm->ippathid = pathid;
	parm->ipmsgid = msgid;
	parm->iptrgcls = trgcls;
	parm->ipflags1 = (IPFGMCL | IPFGMID | IPFGPID);

	b2f0_result = b2f0(REJECT, parm);
	release_param(parm);

	iucv_debug(1, "b2f0_result = %ld", b2f0_result);
	iucv_debug(1, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_reply
 * Purpose: This function responds to the two-way messages that you
 *          receive. You must identify completely the message to
 *          which you wish to reply. ie, pathid, msgid, and trgcls.
 * Input: pathid - path identification number
 *        msgid - specifies the message ID.
 *        trgcls - specifies target class
 *        flags1 - option for path
 *                 IPPRTY- 0x20 - specifies if you want to send priority message
 *        buffer - address of reply buffer
 *        buflen - length of reply buffer
 * Output: ipbfadr2 - Address of buffer updated by the number
 *                    of bytes you have moved.
 *         ipbfln2f - Contains one of the following values:
 *              If the answer buffer is the same length as the reply, this field
 *               contains zero.
 *              If the answer buffer is longer than the reply, this field contains
 *               the number of bytes remaining in the buffer.
 *              If the answer buffer is shorter than the reply, this field contains
 *               a residual count (that is, the number of bytes remianing in the
 *               reply that does not fit into the buffer. In this
 *                case b2f0_result = 5.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - buffer address is NULL
 */
int
iucv_reply (__u16 pathid,
	    __u32 msgid, __u32 trgcls,
	    int flags1,
	    void *buffer, ulong buflen, ulong * ipbfadr2, ulong * ipbfln2f)
{
	iparml_db *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!buffer)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ipbfadr2 = (__u32) ((ulong) buffer);
	parm->ipbfln2f = (__u32) buflen;	/* length of message */
	parm->ippathid = pathid;
	parm->ipmsgid = msgid;
	parm->iptrgcls = trgcls;
	parm->ipflags1 = (__u8) flags1;	/* priority message */

	b2f0_result = b2f0(REPLY, parm);

	if ((!b2f0_result) || (b2f0_result == 5)) {
		if (ipbfadr2)
			*ipbfadr2 = parm->ipbfadr2;
		if (ipbfln2f)
			*ipbfln2f = parm->ipbfln2f;
	}
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_reply_array
 * Purpose: This function responds to the two-way messages that you
 *          receive. You must identify completely the message to
 *          which you wish to reply. ie, pathid, msgid, and trgcls.
 *          The array identifies a list of addresses and lengths of
 *          discontiguous buffers that contains the reply data.
 * Input: pathid - path identification number
 *        msgid - specifies the message ID.
 *        trgcls - specifies target class
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        buffer - address of array of reply buffers
 *        buflen - total length of reply buffers
 * Output: ipbfadr2 - Address of buffer which IUCV is currently working on.
 *         ipbfln2f - Contains one of the following values:
 *              If the answer buffer is the same length as the reply, this field
 *               contains zero.
 *              If the answer buffer is longer than the reply, this field contains
 *               the number of bytes remaining in the buffer.
 *              If the answer buffer is shorter than the reply, this field contains
 *               a residual count (that is, the number of bytes remianing in the
 *               reply that does not fit into the buffer. In this
 *               case b2f0_result = 5.
 * Return: b2f0_result - return code from CP
 *             (-EINVAL) - buffer address is NULL
*/
int
iucv_reply_array (__u16 pathid,
		  __u32 msgid, __u32 trgcls,
		  int flags1,
		  iucv_array_t * buffer,
		  ulong buflen, ulong * ipbfadr2, ulong * ipbfln2f)
{
	iparml_db *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!buffer)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ipbfadr2 = (__u32) ((ulong) buffer);
	parm->ipbfln2f = buflen;	/* length of message */
	parm->ippathid = pathid;
	parm->ipmsgid = msgid;
	parm->iptrgcls = trgcls;
	parm->ipflags1 = (IPANSLST | flags1);

	b2f0_result = b2f0(REPLY, parm);

	if ((!b2f0_result) || (b2f0_result == 5)) {

		if (ipbfadr2)
			*ipbfadr2 = parm->ipbfadr2;
		if (ipbfln2f)
			*ipbfln2f = parm->ipbfln2f;
	}
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_reply_prmmsg
 * Purpose: This function responds to the two-way messages that you
 *          receive. You must identify completely the message to
 *          which you wish to reply. ie, pathid, msgid, and trgcls.
 *          Prmmsg signifies the data is moved into the
 *          parameter list.
 * Input: pathid - path identification number
 *        msgid - specifies the message ID.
 *        trgcls - specifies target class
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        prmmsg - 8-bytes of data to be placed into the parameter
 *                 list.
 * Output: NA
 * Return: b2f0_result - return code from CP
*/
int
iucv_reply_prmmsg (__u16 pathid,
		   __u32 msgid, __u32 trgcls, int flags1, __u8 prmmsg[8])
{
	iparml_dpl *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	parm = (iparml_dpl *)grab_param();

	parm->ippathid = pathid;
	parm->ipmsgid = msgid;
	parm->iptrgcls = trgcls;
	memcpy(parm->iprmmsg, prmmsg, sizeof (parm->iprmmsg));
	parm->ipflags1 = (IPRMDATA | flags1);

	b2f0_result = b2f0(REPLY, parm);
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/**
 * iucv_resume:
 * @pathid:    Path identification number
 * @user_data: 16-byte of user data
 *
 * This function restores communication over a quiesced path.
 * Returns: return code from CP
 */
int
iucv_resume (__u16 pathid, __u8 user_data[16])
{
	iparml_control *parm;
	ulong b2f0_result = 0;

	iucv_debug(1, "entering");
	iucv_debug(1, "pathid = %d", pathid);

	parm = (iparml_control *)grab_param();

	memcpy (parm->ipuser, user_data, sizeof (*user_data));
	parm->ippathid = pathid;

	b2f0_result = b2f0(RESUME, parm);
	release_param(parm);

	iucv_debug(1, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_send
 * Purpose: sends messages
 * Input: pathid - ushort, pathid
 *        msgid  - ulong *, id of message returned to caller
 *        trgcls - ulong, target message class
 *        srccls - ulong, source message class
 *        msgtag - ulong, message tag
 *	  flags1  - Contains options for this path.
 *		IPPRTY - Ox20 - specifies if you want to send a priority message.
 *        buffer - pointer to buffer
 *        buflen - ulong, length of buffer
 * Output: b2f0_result - return code from b2f0 call
 *         msgid - returns message id
 */
int
iucv_send (__u16 pathid, __u32 * msgid,
	   __u32 trgcls, __u32 srccls,
	   __u32 msgtag, int flags1, void *buffer, ulong buflen)
{
	iparml_db *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!buffer)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ipbfadr1 = (__u32) ((ulong) buffer);
	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipbfln1f = (__u32) buflen;	/* length of message */
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipflags1 = (IPNORPY | flags1);	/* one way priority message */

	b2f0_result = b2f0(SEND, parm);

	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_send_array
 * Purpose: This function transmits data to another application.
 *          The contents of buffer is the address of the array of
 *          addresses and lengths of discontiguous buffers that hold
 *          the message text. This is a one-way message and the
 *          receiver will not reply to the message.
 * Input: pathid - path identification number
 *        trgcls - specifies target class
 *        srccls - specifies the source message class
 *        msgtag - specifies a tag to be associated witht the message
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        buffer - address of array of send buffers
 *        buflen - total length of send buffers
 * Output: msgid - specifies the message ID.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - buffer address is NULL
 */
int
iucv_send_array (__u16 pathid,
		 __u32 * msgid,
		 __u32 trgcls,
		 __u32 srccls,
		 __u32 msgtag, int flags1, iucv_array_t * buffer, ulong buflen)
{
	iparml_db *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!buffer)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipbfadr1 = (__u32) ((ulong) buffer);
	parm->ipbfln1f = (__u32) buflen;	/* length of message */
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipflags1 = (IPNORPY | IPBUFLST | flags1);
	b2f0_result = b2f0(SEND, parm);

	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");
	return b2f0_result;
}

/*
 * Name: iucv_send_prmmsg
 * Purpose: This function transmits data to another application.
 *          Prmmsg specifies that the 8-bytes of data are to be moved
 *          into the parameter list. This is a one-way message and the
 *          receiver will not reply to the message.
 * Input: pathid - path identification number
 *        trgcls - specifies target class
 *        srccls - specifies the source message class
 *        msgtag - specifies a tag to be associated with the message
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        prmmsg - 8-bytes of data to be placed into parameter list
 * Output: msgid - specifies the message ID.
 * Return: b2f0_result - return code from CP
*/
int
iucv_send_prmmsg (__u16 pathid,
		  __u32 * msgid,
		  __u32 trgcls,
		  __u32 srccls, __u32 msgtag, int flags1, __u8 prmmsg[8])
{
	iparml_dpl *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	parm = (iparml_dpl *)grab_param();

	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipflags1 = (IPRMDATA | IPNORPY | flags1);
	memcpy(parm->iprmmsg, prmmsg, sizeof(parm->iprmmsg));

	b2f0_result = b2f0(SEND, parm);

	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_send2way
 * Purpose: This function transmits data to another application.
 *          Data to be transmitted is in a buffer. The receiver
 *          of the send is expected to reply to the message and
 *          a buffer is provided into which IUCV moves the reply
 *          to this message.
 * Input: pathid - path identification number
 *        trgcls - specifies target class
 *        srccls - specifies the source message class
 *        msgtag - specifies a tag associated with the message
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        buffer - address of send buffer
 *        buflen - length of send buffer
 *        ansbuf - address of buffer to reply with
 *        anslen - length of buffer to reply with
 * Output: msgid - specifies the message ID.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - buffer or ansbuf address is NULL
 */
int
iucv_send2way (__u16 pathid,
	       __u32 * msgid,
	       __u32 trgcls,
	       __u32 srccls,
	       __u32 msgtag,
	       int flags1,
	       void *buffer, ulong buflen, void *ansbuf, ulong anslen)
{
	iparml_db *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!buffer || !ansbuf)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipbfadr1 = (__u32) ((ulong) buffer);
	parm->ipbfln1f = (__u32) buflen;	/* length of message */
	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
	parm->ipbfln2f = (__u32) anslen;
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipflags1 = flags1;	/* priority message */

	b2f0_result = b2f0(SEND, parm);

	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_send2way_array
 * Purpose: This function transmits data to another application.
 *          The contents of buffer is the address of the array of
 *          addresses and lengths of discontiguous buffers that hold
 *          the message text. The receiver of the send is expected to
 *          reply to the message and a buffer is provided into which
 *          IUCV moves the reply to this message.
 * Input: pathid - path identification number
 *        trgcls - specifies target class
 *        srccls - specifies the source message class
 *        msgtag - spcifies a tag to be associated with the message
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        buffer - address of array of send buffers
 *        buflen - total length of send buffers
 *        ansbuf - address of buffer to reply with
 *        anslen - length of buffer to reply with
 * Output: msgid - specifies the message ID.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - buffer address is NULL
 */
int
iucv_send2way_array (__u16 pathid,
		     __u32 * msgid,
		     __u32 trgcls,
		     __u32 srccls,
		     __u32 msgtag,
		     int flags1,
		     iucv_array_t * buffer,
		     ulong buflen, iucv_array_t * ansbuf, ulong anslen)
{
	iparml_db *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!buffer || !ansbuf)
		return -EINVAL;

	parm = (iparml_db *)grab_param();

	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipbfadr1 = (__u32) ((ulong) buffer);
	parm->ipbfln1f = (__u32) buflen;	/* length of message */
	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
	parm->ipbfln2f = (__u32) anslen;
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipflags1 = (IPBUFLST | IPANSLST | flags1);
	b2f0_result = b2f0(SEND, parm);
	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");
	return b2f0_result;
}

/*
 * Name: iucv_send2way_prmmsg
 * Purpose: This function transmits data to another application.
 *          Prmmsg specifies that the 8-bytes of data are to be moved
 *          into the parameter list. This is a two-way message and the
 *          receiver of the message is expected to reply. A buffer
 *          is provided into which IUCV moves the reply to this
 *          message.
 * Input: pathid - path identification number
 *        trgcls - specifies target class
 *        srccls - specifies the source message class
 *        msgtag - specifies a tag to be associated with the message
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        prmmsg - 8-bytes of data to be placed in parameter list
 *        ansbuf - address of buffer to reply with
 *        anslen - length of buffer to reply with
 * Output: msgid - specifies the message ID.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - buffer address is NULL
*/
int
iucv_send2way_prmmsg (__u16 pathid,
		      __u32 * msgid,
		      __u32 trgcls,
		      __u32 srccls,
		      __u32 msgtag,
		      ulong flags1, __u8 prmmsg[8], void *ansbuf, ulong anslen)
{
	iparml_dpl *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!ansbuf)
		return -EINVAL;

	parm = (iparml_dpl *)grab_param();

	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
	parm->ipbfln2f = (__u32) anslen;
	parm->ipflags1 = (IPRMDATA | flags1);	/* message in prmlist */
	memcpy(parm->iprmmsg, prmmsg, sizeof(parm->iprmmsg));

	b2f0_result = b2f0(SEND, parm);

	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");

	return b2f0_result;
}

/*
 * Name: iucv_send2way_prmmsg_array
 * Purpose: This function transmits data to another application.
 *          Prmmsg specifies that the 8-bytes of data are to be moved
 *          into the parameter list. This is a two-way message and the
 *          receiver of the message is expected to reply. A buffer
 *          is provided into which IUCV moves the reply to this
 *          message. The contents of ansbuf is the address of the
 *          array of addresses and lengths of discontiguous buffers
 *          that contain the reply.
 * Input: pathid - path identification number
 *        trgcls - specifies target class
 *        srccls - specifies the source message class
 *        msgtag - specifies a tag to be associated with the message
 *        flags1 - option for path
 *                 IPPRTY- specifies if you want to send priority message
 *        prmmsg - 8-bytes of data to be placed into the parameter list
 *        ansbuf - address of buffer to reply with
 *        anslen - length of buffer to reply with
 * Output: msgid - specifies the message ID.
 * Return: b2f0_result - return code from CP
 *         (-EINVAL) - ansbuf address is NULL
 */
int
iucv_send2way_prmmsg_array (__u16 pathid,
			    __u32 * msgid,
			    __u32 trgcls,
			    __u32 srccls,
			    __u32 msgtag,
			    int flags1,
			    __u8 prmmsg[8],
			    iucv_array_t * ansbuf, ulong anslen)
{
	iparml_dpl *parm;
	ulong b2f0_result;

	iucv_debug(2, "entering");

	if (!ansbuf)
		return -EINVAL;

	parm = (iparml_dpl *)grab_param();

	parm->ippathid = pathid;
	parm->iptrgcls = trgcls;
	parm->ipsrccls = srccls;
	parm->ipmsgtag = msgtag;
	parm->ipbfadr2 = (__u32) ((ulong) ansbuf);
	parm->ipbfln2f = (__u32) anslen;
	parm->ipflags1 = (IPRMDATA | IPANSLST | flags1);
	memcpy(parm->iprmmsg, prmmsg, sizeof(parm->iprmmsg));
	b2f0_result = b2f0(SEND, parm);
	if ((!b2f0_result) && (msgid))
		*msgid = parm->ipmsgid;
	release_param(parm);

	iucv_debug(2, "exiting");
	return b2f0_result;
}

void
iucv_setmask_cpuid (void *result)
{
        iparml_set_mask *parm;

        iucv_debug(1, "entering");
        parm = (iparml_set_mask *)grab_param();
        parm->ipmask = *((__u8*)result);
        *((ulong *)result) = b2f0(SETMASK, parm);
        release_param(parm);

        iucv_debug(1, "b2f0_result = %ld", *((ulong *)result));
        iucv_debug(1, "exiting");
}

/*
 * Name: iucv_setmask
 * Purpose: This function enables or disables the following IUCV
 *          external interruptions: Nonpriority and priority message
 *          interrupts, nonpriority and priority reply interrupts.
 * Input: SetMaskFlag - options for interrupts
 *           0x80 - Nonpriority_MessagePendingInterruptsFlag
 *           0x40 - Priority_MessagePendingInterruptsFlag
 *           0x20 - Nonpriority_MessageCompletionInterruptsFlag
 *           0x10 - Priority_MessageCompletionInterruptsFlag
 *           0x08 - IUCVControlInterruptsFlag
 * Output: NA
 * Return: b2f0_result - return code from CP
*/
int
iucv_setmask (int SetMaskFlag)
{
	union {
		ulong result;
		__u8  param;
	} u;
	int cpu;

	u.param = SetMaskFlag;
	cpu = get_cpu();
	smp_call_function_on(iucv_setmask_cpuid, &u, 0, 1, iucv_cpuid);
	put_cpu();

	return u.result;
}

/**
 * iucv_sever:
 * @pathid:    Path identification number
 * @user_data: 16-byte of user data
 *
 * This function terminates an iucv path.
 * Returns: return code from CP
 */
int
iucv_sever(__u16 pathid, __u8 user_data[16])
{
	iparml_control *parm;
	ulong b2f0_result = 0;

	iucv_debug(1, "entering");
	parm = (iparml_control *)grab_param();

	memcpy(parm->ipuser, user_data, sizeof(parm->ipuser));
	parm->ippathid = pathid;

	b2f0_result = b2f0(SEVER, parm);

	if (!b2f0_result)
		iucv_remove_pathid(pathid);
	release_param(parm);

	iucv_debug(1, "exiting");
	return b2f0_result;
}

/*
 * Interrupt Handlers
 *******************************************************************************/

/**
 * iucv_irq_handler:
 * @regs: Current registers
 * @code: irq code
 *
 * Handles external interrupts coming in from CP.
 * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
 */
static void
iucv_irq_handler(struct pt_regs *regs, __u16 code)
{
	iucv_irqdata *irqdata;

	irqdata = kmalloc(sizeof(iucv_irqdata), GFP_ATOMIC);
	if (!irqdata) {
		printk(KERN_WARNING "%s: out of memory\n", __FUNCTION__);
		return;
	}

	memcpy(&irqdata->data, iucv_external_int_buffer,
	       sizeof(iucv_GeneralInterrupt));

	spin_lock(&iucv_irq_queue_lock);
	list_add_tail(&irqdata->queue, &iucv_irq_queue);
	spin_unlock(&iucv_irq_queue_lock);

	tasklet_schedule(&iucv_tasklet);
}

/**
 * iucv_do_int:
 * @int_buf: Pointer to copy of external interrupt buffer
 *
 * The workhorse for handling interrupts queued by iucv_irq_handler().
 * This function is called from the bottom half iucv_tasklet_handler().
 */
static void
iucv_do_int(iucv_GeneralInterrupt * int_buf)
{
	handler *h = NULL;
	struct list_head *lh;
	ulong flags;
	iucv_interrupt_ops_t *interrupt = NULL;	/* interrupt addresses */
	__u8 temp_buff1[24], temp_buff2[24];	/* masked handler id. */
	int rc = 0, j = 0;
	__u8 no_listener[16] = "NO LISTENER";

	iucv_debug(2, "entering, pathid %d, type %02X",
		 int_buf->ippathid, int_buf->iptype);
	iucv_dumpit("External Interrupt Buffer:",
		    int_buf, sizeof(iucv_GeneralInterrupt));

	ASCEBC (no_listener, 16);

	if (int_buf->iptype != 01) {
		if ((int_buf->ippathid) > (max_connections - 1)) {
			printk(KERN_WARNING "%s: Got interrupt with pathid %d"
			       " > max_connections (%ld)\n", __FUNCTION__,
			       int_buf->ippathid, max_connections - 1);
		} else {
			h = iucv_pathid_table[int_buf->ippathid];
			interrupt = h->interrupt_table;
			iucv_dumpit("Handler:", h, sizeof(handler));
		}
	}

	/* end of if statement */
	switch (int_buf->iptype) {
		case 0x01:		/* connection pending */
			if (messagesDisabled) {
			    iucv_setmask(~0);
			    messagesDisabled = 0;
			}
			spin_lock_irqsave(&iucv_lock, flags);
			list_for_each(lh, &iucv_handler_table) {
				h = list_entry(lh, handler, list);
				memcpy(temp_buff1, &(int_buf->ipvmid), 24);
				memcpy(temp_buff2, &(h->id.userid), 24);
				for (j = 0; j < 24; j++) {
					temp_buff1[j] &= (h->id.mask)[j];
					temp_buff2[j] &= (h->id.mask)[j];
				}
				
				iucv_dumpit("temp_buff1:",
					    temp_buff1, sizeof(temp_buff1));
				iucv_dumpit("temp_buff2",
					    temp_buff2, sizeof(temp_buff2));
				
				if (!memcmp (temp_buff1, temp_buff2, 24)) {
					
					iucv_debug(2,
						   "found a matching handler");
					break;
				} else
					h = NULL;
			}
			spin_unlock_irqrestore (&iucv_lock, flags);
			if (h) {
				/* ADD PATH TO PATHID TABLE */
				rc = iucv_add_pathid(int_buf->ippathid, h);
				if (rc) {
					iucv_sever (int_buf->ippathid,
						    no_listener);
					iucv_debug(1,
						   "add_pathid failed, rc = %d",
						   rc);
				} else {
					interrupt = h->interrupt_table;
					if (interrupt->ConnectionPending) {
						EBCASC (int_buf->ipvmid, 8);
						interrupt->ConnectionPending(
							(iucv_ConnectionPending *)int_buf,
							h->pgm_data);
					} else
						iucv_sever(int_buf->ippathid,
							   no_listener);
				}
			} else
				iucv_sever(int_buf->ippathid, no_listener);
			break;
			
		case 0x02:		/*connection complete */
			if (messagesDisabled) {
			    iucv_setmask(~0);
			    messagesDisabled = 0;
			}
			if (h) {
				if (interrupt->ConnectionComplete)
				{
					interrupt->ConnectionComplete(
						(iucv_ConnectionComplete *)int_buf,
						h->pgm_data);
				}
				else
					iucv_debug(1,
						   "ConnectionComplete not called");
			} else
				iucv_sever(int_buf->ippathid, no_listener);
			break;
			
		case 0x03:		/* connection severed */
			if (messagesDisabled) {
			    iucv_setmask(~0);
			    messagesDisabled = 0;
			}
			if (h) {
				if (interrupt->ConnectionSevered)
					interrupt->ConnectionSevered(
						(iucv_ConnectionSevered *)int_buf,
						h->pgm_data);
				
				else
					iucv_sever (int_buf->ippathid, no_listener);
			} else
				iucv_sever(int_buf->ippathid, no_listener);
			break;
			
		case 0x04:		/* connection quiesced */
			if (messagesDisabled) {
			    iucv_setmask(~0);
			    messagesDisabled = 0;
			}
			if (h) {
				if (interrupt->ConnectionQuiesced)
					interrupt->ConnectionQuiesced(
						(iucv_ConnectionQuiesced *)int_buf,
						h->pgm_data);
				else
					iucv_debug(1,
						   "ConnectionQuiesced not called");
			}
			break;
			
		case 0x05:		/* connection resumed */
			if (messagesDisabled) {
			    iucv_setmask(~0);
			    messagesDisabled = 0;
			}
			if (h) {
				if (interrupt->ConnectionResumed)
					interrupt->ConnectionResumed(
						(iucv_ConnectionResumed *)int_buf,
						h->pgm_data);
				else
					iucv_debug(1,
						   "ConnectionResumed not called");
			}
			break;
			
		case 0x06:		/* priority message complete */
		case 0x07:		/* nonpriority message complete */
			if (h) {
				if (interrupt->MessageComplete)
					interrupt->MessageComplete(
						(iucv_MessageComplete *)int_buf,
						h->pgm_data);
				else
					iucv_debug(2,
						   "MessageComplete not called");
			}
			break;
			
		case 0x08:		/* priority message pending  */
		case 0x09:		/* nonpriority message pending  */
			if (h) {
				if (interrupt->MessagePending)
					interrupt->MessagePending(
						(iucv_MessagePending *) int_buf,
						h->pgm_data);
				else
					iucv_debug(2,
						   "MessagePending not called");
			}
			break;
		default:		/* unknown iucv type */
			printk(KERN_WARNING "%s: unknown iucv interrupt\n",
			       __FUNCTION__);
			break;
	}			/* end switch */
	
	iucv_debug(2, "exiting pathid %d, type %02X",
		 int_buf->ippathid, int_buf->iptype);

	return;
}

/**
 * iucv_tasklet_handler:
 *
 * This function loops over the queue of irq buffers and runs iucv_do_int()
 * on every queue element.
 */
static void
iucv_tasklet_handler(unsigned long ignored)
{
	struct list_head head;
	struct list_head *next;
	ulong  flags;

	spin_lock_irqsave(&iucv_irq_queue_lock, flags);
	list_add(&head, &iucv_irq_queue);
	list_del_init(&iucv_irq_queue);
	spin_unlock_irqrestore (&iucv_irq_queue_lock, flags);

	next = head.next;
	while (next != &head) {
		iucv_irqdata *p = list_entry(next, iucv_irqdata, queue);

		next = next->next;
		iucv_do_int(&p->data);
		kfree(p);
	}

	return;
}

subsys_initcall(iucv_init);
module_exit(iucv_exit);

/**
 * Export all public stuff
 */
EXPORT_SYMBOL (iucv_bus);
EXPORT_SYMBOL (iucv_root);
EXPORT_SYMBOL (iucv_accept);
EXPORT_SYMBOL (iucv_connect);
#if 0
EXPORT_SYMBOL (iucv_purge);
EXPORT_SYMBOL (iucv_query_maxconn);
EXPORT_SYMBOL (iucv_query_bufsize);
EXPORT_SYMBOL (iucv_quiesce);
#endif
EXPORT_SYMBOL (iucv_receive);
#if 0
EXPORT_SYMBOL (iucv_receive_array);
#endif
EXPORT_SYMBOL (iucv_reject);
#if 0
EXPORT_SYMBOL (iucv_reply);
EXPORT_SYMBOL (iucv_reply_array);
EXPORT_SYMBOL (iucv_resume);
#endif
EXPORT_SYMBOL (iucv_reply_prmmsg);
EXPORT_SYMBOL (iucv_send);
EXPORT_SYMBOL (iucv_send2way);
EXPORT_SYMBOL (iucv_send2way_array);
EXPORT_SYMBOL (iucv_send2way_prmmsg);
EXPORT_SYMBOL (iucv_send2way_prmmsg_array);
2556 2557
#if 0
EXPORT_SYMBOL (iucv_send_array);
L
Linus Torvalds 已提交
2558 2559 2560 2561 2562 2563
EXPORT_SYMBOL (iucv_send_prmmsg);
EXPORT_SYMBOL (iucv_setmask);
#endif
EXPORT_SYMBOL (iucv_sever);
EXPORT_SYMBOL (iucv_register_program);
EXPORT_SYMBOL (iucv_unregister_program);