1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IUCV base infrastructure. 4 * 5 * Copyright IBM Corp. 2001, 2009 6 * 7 * Author(s): 8 * Original source: 9 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 10 * Xenia Tkatschow (xenia@us.ibm.com) 11 * 2Gb awareness and general cleanup: 12 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) 13 * Rewritten for af_iucv: 14 * Martin Schwidefsky <schwidefsky@de.ibm.com> 15 * PM functions: 16 * Ursula Braun (ursula.braun@de.ibm.com) 17 * 18 * Documentation used: 19 * The original source 20 * CP Programming Service, IBM document # SC24-5760 21 */ 22 23 #define KMSG_COMPONENT "iucv" 24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 25 26 #include <linux/kernel_stat.h> 27 #include <linux/module.h> 28 #include <linux/moduleparam.h> 29 #include <linux/spinlock.h> 30 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/init.h> 33 #include <linux/interrupt.h> 34 #include <linux/list.h> 35 #include <linux/errno.h> 36 #include <linux/err.h> 37 #include <linux/device.h> 38 #include <linux/cpu.h> 39 #include <linux/reboot.h> 40 #include <net/iucv/iucv.h> 41 #include <linux/atomic.h> 42 #include <asm/ebcdic.h> 43 #include <asm/io.h> 44 #include <asm/irq.h> 45 #include <asm/smp.h> 46 47 /* 48 * FLAGS: 49 * All flags are defined in the field IPFLAGS1 of each function 50 * and can be found in CP Programming Services. 51 * IPSRCCLS - Indicates you have specified a source class. 52 * IPTRGCLS - Indicates you have specified a target class. 53 * IPFGPID - Indicates you have specified a pathid. 54 * IPFGMID - Indicates you have specified a message ID. 55 * IPNORPY - Indicates a one-way message. No reply expected. 56 * IPALL - Indicates that all paths are affected. 57 */ 58 #define IUCV_IPSRCCLS 0x01 59 #define IUCV_IPTRGCLS 0x01 60 #define IUCV_IPFGPID 0x02 61 #define IUCV_IPFGMID 0x04 62 #define IUCV_IPNORPY 0x10 63 #define IUCV_IPALL 0x80 64 65 static int iucv_bus_match(struct device *dev, struct device_driver *drv) 66 { 67 return 0; 68 } 69 70 struct bus_type iucv_bus = { 71 .name = "iucv", 72 .match = iucv_bus_match, 73 }; 74 EXPORT_SYMBOL(iucv_bus); 75 76 struct device *iucv_root; 77 EXPORT_SYMBOL(iucv_root); 78 79 static int iucv_available; 80 81 /* General IUCV interrupt structure */ 82 struct iucv_irq_data { 83 u16 ippathid; 84 u8 ipflags1; 85 u8 iptype; 86 u32 res2[9]; 87 }; 88 89 struct iucv_irq_list { 90 struct list_head list; 91 struct iucv_irq_data data; 92 }; 93 94 static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; 95 static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE }; 96 static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE }; 97 98 /* 99 * Queue of interrupt buffers lock for delivery via the tasklet 100 * (fast but can't call smp_call_function). 101 */ 102 static LIST_HEAD(iucv_task_queue); 103 104 /* 105 * The tasklet for fast delivery of iucv interrupts. 106 */ 107 static void iucv_tasklet_fn(unsigned long); 108 static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn); 109 110 /* 111 * Queue of interrupt buffers for delivery via a work queue 112 * (slower but can call smp_call_function). 113 */ 114 static LIST_HEAD(iucv_work_queue); 115 116 /* 117 * The work element to deliver path pending interrupts. 118 */ 119 static void iucv_work_fn(struct work_struct *work); 120 static DECLARE_WORK(iucv_work, iucv_work_fn); 121 122 /* 123 * Spinlock protecting task and work queue. 124 */ 125 static DEFINE_SPINLOCK(iucv_queue_lock); 126 127 enum iucv_command_codes { 128 IUCV_QUERY = 0, 129 IUCV_RETRIEVE_BUFFER = 2, 130 IUCV_SEND = 4, 131 IUCV_RECEIVE = 5, 132 IUCV_REPLY = 6, 133 IUCV_REJECT = 8, 134 IUCV_PURGE = 9, 135 IUCV_ACCEPT = 10, 136 IUCV_CONNECT = 11, 137 IUCV_DECLARE_BUFFER = 12, 138 IUCV_QUIESCE = 13, 139 IUCV_RESUME = 14, 140 IUCV_SEVER = 15, 141 IUCV_SETMASK = 16, 142 IUCV_SETCONTROLMASK = 17, 143 }; 144 145 /* 146 * Error messages that are used with the iucv_sever function. They get 147 * converted to EBCDIC. 148 */ 149 static char iucv_error_no_listener[16] = "NO LISTENER"; 150 static char iucv_error_no_memory[16] = "NO MEMORY"; 151 static char iucv_error_pathid[16] = "INVALID PATHID"; 152 153 /* 154 * iucv_handler_list: List of registered handlers. 155 */ 156 static LIST_HEAD(iucv_handler_list); 157 158 /* 159 * iucv_path_table: an array of iucv_path structures. 160 */ 161 static struct iucv_path **iucv_path_table; 162 static unsigned long iucv_max_pathid; 163 164 /* 165 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table 166 */ 167 static DEFINE_SPINLOCK(iucv_table_lock); 168 169 /* 170 * iucv_active_cpu: contains the number of the cpu executing the tasklet 171 * or the work handler. Needed for iucv_path_sever called from tasklet. 172 */ 173 static int iucv_active_cpu = -1; 174 175 /* 176 * Mutex and wait queue for iucv_register/iucv_unregister. 177 */ 178 static DEFINE_MUTEX(iucv_register_mutex); 179 180 /* 181 * Counter for number of non-smp capable handlers. 182 */ 183 static int iucv_nonsmp_handler; 184 185 /* 186 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, 187 * iucv_path_quiesce and iucv_path_sever. 188 */ 189 struct iucv_cmd_control { 190 u16 ippathid; 191 u8 ipflags1; 192 u8 iprcode; 193 u16 ipmsglim; 194 u16 res1; 195 u8 ipvmid[8]; 196 u8 ipuser[16]; 197 u8 iptarget[8]; 198 } __attribute__ ((packed,aligned(8))); 199 200 /* 201 * Data in parameter list iucv structure. Used by iucv_message_send, 202 * iucv_message_send2way and iucv_message_reply. 203 */ 204 struct iucv_cmd_dpl { 205 u16 ippathid; 206 u8 ipflags1; 207 u8 iprcode; 208 u32 ipmsgid; 209 u32 iptrgcls; 210 u8 iprmmsg[8]; 211 u32 ipsrccls; 212 u32 ipmsgtag; 213 u32 ipbfadr2; 214 u32 ipbfln2f; 215 u32 res; 216 } __attribute__ ((packed,aligned(8))); 217 218 /* 219 * Data in buffer iucv structure. Used by iucv_message_receive, 220 * iucv_message_reject, iucv_message_send, iucv_message_send2way 221 * and iucv_declare_cpu. 222 */ 223 struct iucv_cmd_db { 224 u16 ippathid; 225 u8 ipflags1; 226 u8 iprcode; 227 u32 ipmsgid; 228 u32 iptrgcls; 229 u32 ipbfadr1; 230 u32 ipbfln1f; 231 u32 ipsrccls; 232 u32 ipmsgtag; 233 u32 ipbfadr2; 234 u32 ipbfln2f; 235 u32 res; 236 } __attribute__ ((packed,aligned(8))); 237 238 /* 239 * Purge message iucv structure. Used by iucv_message_purge. 240 */ 241 struct iucv_cmd_purge { 242 u16 ippathid; 243 u8 ipflags1; 244 u8 iprcode; 245 u32 ipmsgid; 246 u8 ipaudit[3]; 247 u8 res1[5]; 248 u32 res2; 249 u32 ipsrccls; 250 u32 ipmsgtag; 251 u32 res3[3]; 252 } __attribute__ ((packed,aligned(8))); 253 254 /* 255 * Set mask iucv structure. Used by iucv_enable_cpu. 256 */ 257 struct iucv_cmd_set_mask { 258 u8 ipmask; 259 u8 res1[2]; 260 u8 iprcode; 261 u32 res2[9]; 262 } __attribute__ ((packed,aligned(8))); 263 264 union iucv_param { 265 struct iucv_cmd_control ctrl; 266 struct iucv_cmd_dpl dpl; 267 struct iucv_cmd_db db; 268 struct iucv_cmd_purge purge; 269 struct iucv_cmd_set_mask set_mask; 270 }; 271 272 /* 273 * Anchor for per-cpu IUCV command parameter block. 274 */ 275 static union iucv_param *iucv_param[NR_CPUS]; 276 static union iucv_param *iucv_param_irq[NR_CPUS]; 277 278 /** 279 * __iucv_call_b2f0 280 * @command: identifier of IUCV call to CP. 281 * @parm: pointer to a struct iucv_parm block 282 * 283 * Calls CP to execute IUCV commands. 284 * 285 * Returns the result of the CP IUCV call. 286 */ 287 static inline int __iucv_call_b2f0(int command, union iucv_param *parm) 288 { 289 int cc; 290 291 asm volatile( 292 " lgr 0,%[reg0]\n" 293 " lgr 1,%[reg1]\n" 294 " .long 0xb2f01000\n" 295 " ipm %[cc]\n" 296 " srl %[cc],28\n" 297 : [cc] "=&d" (cc), "+m" (*parm) 298 : [reg0] "d" ((unsigned long)command), 299 [reg1] "d" ((unsigned long)parm) 300 : "cc", "0", "1"); 301 return cc; 302 } 303 304 static inline int iucv_call_b2f0(int command, union iucv_param *parm) 305 { 306 int ccode; 307 308 ccode = __iucv_call_b2f0(command, parm); 309 return ccode == 1 ? parm->ctrl.iprcode : ccode; 310 } 311 312 /* 313 * iucv_query_maxconn 314 * 315 * Determines the maximum number of connections that may be established. 316 * 317 * Returns the maximum number of connections or -EPERM is IUCV is not 318 * available. 319 */ 320 static int __iucv_query_maxconn(void *param, unsigned long *max_pathid) 321 { 322 unsigned long reg1 = virt_to_phys(param); 323 int cc; 324 325 asm volatile ( 326 " lghi 0,%[cmd]\n" 327 " lgr 1,%[reg1]\n" 328 " .long 0xb2f01000\n" 329 " ipm %[cc]\n" 330 " srl %[cc],28\n" 331 " lgr %[reg1],1\n" 332 : [cc] "=&d" (cc), [reg1] "+&d" (reg1) 333 : [cmd] "K" (IUCV_QUERY) 334 : "cc", "0", "1"); 335 *max_pathid = reg1; 336 return cc; 337 } 338 339 static int iucv_query_maxconn(void) 340 { 341 unsigned long max_pathid; 342 void *param; 343 int ccode; 344 345 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA); 346 if (!param) 347 return -ENOMEM; 348 ccode = __iucv_query_maxconn(param, &max_pathid); 349 if (ccode == 0) 350 iucv_max_pathid = max_pathid; 351 kfree(param); 352 return ccode ? -EPERM : 0; 353 } 354 355 /** 356 * iucv_allow_cpu 357 * @data: unused 358 * 359 * Allow iucv interrupts on this cpu. 360 */ 361 static void iucv_allow_cpu(void *data) 362 { 363 int cpu = smp_processor_id(); 364 union iucv_param *parm; 365 366 /* 367 * Enable all iucv interrupts. 368 * ipmask contains bits for the different interrupts 369 * 0x80 - Flag to allow nonpriority message pending interrupts 370 * 0x40 - Flag to allow priority message pending interrupts 371 * 0x20 - Flag to allow nonpriority message completion interrupts 372 * 0x10 - Flag to allow priority message completion interrupts 373 * 0x08 - Flag to allow IUCV control interrupts 374 */ 375 parm = iucv_param_irq[cpu]; 376 memset(parm, 0, sizeof(union iucv_param)); 377 parm->set_mask.ipmask = 0xf8; 378 iucv_call_b2f0(IUCV_SETMASK, parm); 379 380 /* 381 * Enable all iucv control interrupts. 382 * ipmask contains bits for the different interrupts 383 * 0x80 - Flag to allow pending connections interrupts 384 * 0x40 - Flag to allow connection complete interrupts 385 * 0x20 - Flag to allow connection severed interrupts 386 * 0x10 - Flag to allow connection quiesced interrupts 387 * 0x08 - Flag to allow connection resumed interrupts 388 */ 389 memset(parm, 0, sizeof(union iucv_param)); 390 parm->set_mask.ipmask = 0xf8; 391 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); 392 /* Set indication that iucv interrupts are allowed for this cpu. */ 393 cpumask_set_cpu(cpu, &iucv_irq_cpumask); 394 } 395 396 /** 397 * iucv_block_cpu 398 * @data: unused 399 * 400 * Block iucv interrupts on this cpu. 401 */ 402 static void iucv_block_cpu(void *data) 403 { 404 int cpu = smp_processor_id(); 405 union iucv_param *parm; 406 407 /* Disable all iucv interrupts. */ 408 parm = iucv_param_irq[cpu]; 409 memset(parm, 0, sizeof(union iucv_param)); 410 iucv_call_b2f0(IUCV_SETMASK, parm); 411 412 /* Clear indication that iucv interrupts are allowed for this cpu. */ 413 cpumask_clear_cpu(cpu, &iucv_irq_cpumask); 414 } 415 416 /** 417 * iucv_declare_cpu 418 * @data: unused 419 * 420 * Declare a interrupt buffer on this cpu. 421 */ 422 static void iucv_declare_cpu(void *data) 423 { 424 int cpu = smp_processor_id(); 425 union iucv_param *parm; 426 int rc; 427 428 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) 429 return; 430 431 /* Declare interrupt buffer. */ 432 parm = iucv_param_irq[cpu]; 433 memset(parm, 0, sizeof(union iucv_param)); 434 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); 435 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); 436 if (rc) { 437 char *err = "Unknown"; 438 switch (rc) { 439 case 0x03: 440 err = "Directory error"; 441 break; 442 case 0x0a: 443 err = "Invalid length"; 444 break; 445 case 0x13: 446 err = "Buffer already exists"; 447 break; 448 case 0x3e: 449 err = "Buffer overlap"; 450 break; 451 case 0x5c: 452 err = "Paging or storage error"; 453 break; 454 } 455 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n", 456 cpu, rc, err); 457 return; 458 } 459 460 /* Set indication that an iucv buffer exists for this cpu. */ 461 cpumask_set_cpu(cpu, &iucv_buffer_cpumask); 462 463 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask)) 464 /* Enable iucv interrupts on this cpu. */ 465 iucv_allow_cpu(NULL); 466 else 467 /* Disable iucv interrupts on this cpu. */ 468 iucv_block_cpu(NULL); 469 } 470 471 /** 472 * iucv_retrieve_cpu 473 * @data: unused 474 * 475 * Retrieve interrupt buffer on this cpu. 476 */ 477 static void iucv_retrieve_cpu(void *data) 478 { 479 int cpu = smp_processor_id(); 480 union iucv_param *parm; 481 482 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) 483 return; 484 485 /* Block iucv interrupts. */ 486 iucv_block_cpu(NULL); 487 488 /* Retrieve interrupt buffer. */ 489 parm = iucv_param_irq[cpu]; 490 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); 491 492 /* Clear indication that an iucv buffer exists for this cpu. */ 493 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask); 494 } 495 496 /* 497 * iucv_setmask_mp 498 * 499 * Allow iucv interrupts on all cpus. 500 */ 501 static void iucv_setmask_mp(void) 502 { 503 int cpu; 504 505 cpus_read_lock(); 506 for_each_online_cpu(cpu) 507 /* Enable all cpus with a declared buffer. */ 508 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) && 509 !cpumask_test_cpu(cpu, &iucv_irq_cpumask)) 510 smp_call_function_single(cpu, iucv_allow_cpu, 511 NULL, 1); 512 cpus_read_unlock(); 513 } 514 515 /* 516 * iucv_setmask_up 517 * 518 * Allow iucv interrupts on a single cpu. 519 */ 520 static void iucv_setmask_up(void) 521 { 522 cpumask_t cpumask; 523 int cpu; 524 525 /* Disable all cpu but the first in cpu_irq_cpumask. */ 526 cpumask_copy(&cpumask, &iucv_irq_cpumask); 527 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask); 528 for_each_cpu(cpu, &cpumask) 529 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); 530 } 531 532 /* 533 * iucv_enable 534 * 535 * This function makes iucv ready for use. It allocates the pathid 536 * table, declares an iucv interrupt buffer and enables the iucv 537 * interrupts. Called when the first user has registered an iucv 538 * handler. 539 */ 540 static int iucv_enable(void) 541 { 542 size_t alloc_size; 543 int cpu, rc; 544 545 cpus_read_lock(); 546 rc = -ENOMEM; 547 alloc_size = iucv_max_pathid * sizeof(struct iucv_path); 548 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); 549 if (!iucv_path_table) 550 goto out; 551 /* Declare per cpu buffers. */ 552 rc = -EIO; 553 for_each_online_cpu(cpu) 554 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); 555 if (cpumask_empty(&iucv_buffer_cpumask)) 556 /* No cpu could declare an iucv buffer. */ 557 goto out; 558 cpus_read_unlock(); 559 return 0; 560 out: 561 kfree(iucv_path_table); 562 iucv_path_table = NULL; 563 cpus_read_unlock(); 564 return rc; 565 } 566 567 /* 568 * iucv_disable 569 * 570 * This function shuts down iucv. It disables iucv interrupts, retrieves 571 * the iucv interrupt buffer and frees the pathid table. Called after the 572 * last user unregister its iucv handler. 573 */ 574 static void iucv_disable(void) 575 { 576 cpus_read_lock(); 577 on_each_cpu(iucv_retrieve_cpu, NULL, 1); 578 kfree(iucv_path_table); 579 iucv_path_table = NULL; 580 cpus_read_unlock(); 581 } 582 583 static int iucv_cpu_dead(unsigned int cpu) 584 { 585 kfree(iucv_param_irq[cpu]); 586 iucv_param_irq[cpu] = NULL; 587 kfree(iucv_param[cpu]); 588 iucv_param[cpu] = NULL; 589 kfree(iucv_irq_data[cpu]); 590 iucv_irq_data[cpu] = NULL; 591 return 0; 592 } 593 594 static int iucv_cpu_prepare(unsigned int cpu) 595 { 596 /* Note: GFP_DMA used to get memory below 2G */ 597 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), 598 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); 599 if (!iucv_irq_data[cpu]) 600 goto out_free; 601 602 /* Allocate parameter blocks. */ 603 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), 604 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); 605 if (!iucv_param[cpu]) 606 goto out_free; 607 608 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), 609 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); 610 if (!iucv_param_irq[cpu]) 611 goto out_free; 612 613 return 0; 614 615 out_free: 616 iucv_cpu_dead(cpu); 617 return -ENOMEM; 618 } 619 620 static int iucv_cpu_online(unsigned int cpu) 621 { 622 if (!iucv_path_table) 623 return 0; 624 iucv_declare_cpu(NULL); 625 return 0; 626 } 627 628 static int iucv_cpu_down_prep(unsigned int cpu) 629 { 630 cpumask_t cpumask; 631 632 if (!iucv_path_table) 633 return 0; 634 635 cpumask_copy(&cpumask, &iucv_buffer_cpumask); 636 cpumask_clear_cpu(cpu, &cpumask); 637 if (cpumask_empty(&cpumask)) 638 /* Can't offline last IUCV enabled cpu. */ 639 return -EINVAL; 640 641 iucv_retrieve_cpu(NULL); 642 if (!cpumask_empty(&iucv_irq_cpumask)) 643 return 0; 644 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask), 645 iucv_allow_cpu, NULL, 1); 646 return 0; 647 } 648 649 /** 650 * iucv_sever_pathid 651 * @pathid: path identification number. 652 * @userdata: 16-bytes of user data. 653 * 654 * Sever an iucv path to free up the pathid. Used internally. 655 */ 656 static int iucv_sever_pathid(u16 pathid, u8 *userdata) 657 { 658 union iucv_param *parm; 659 660 parm = iucv_param_irq[smp_processor_id()]; 661 memset(parm, 0, sizeof(union iucv_param)); 662 if (userdata) 663 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); 664 parm->ctrl.ippathid = pathid; 665 return iucv_call_b2f0(IUCV_SEVER, parm); 666 } 667 668 /** 669 * __iucv_cleanup_queue 670 * @dummy: unused dummy argument 671 * 672 * Nop function called via smp_call_function to force work items from 673 * pending external iucv interrupts to the work queue. 674 */ 675 static void __iucv_cleanup_queue(void *dummy) 676 { 677 } 678 679 /** 680 * iucv_cleanup_queue 681 * 682 * Function called after a path has been severed to find all remaining 683 * work items for the now stale pathid. The caller needs to hold the 684 * iucv_table_lock. 685 */ 686 static void iucv_cleanup_queue(void) 687 { 688 struct iucv_irq_list *p, *n; 689 690 /* 691 * When a path is severed, the pathid can be reused immediately 692 * on a iucv connect or a connection pending interrupt. Remove 693 * all entries from the task queue that refer to a stale pathid 694 * (iucv_path_table[ix] == NULL). Only then do the iucv connect 695 * or deliver the connection pending interrupt. To get all the 696 * pending interrupts force them to the work queue by calling 697 * an empty function on all cpus. 698 */ 699 smp_call_function(__iucv_cleanup_queue, NULL, 1); 700 spin_lock_irq(&iucv_queue_lock); 701 list_for_each_entry_safe(p, n, &iucv_task_queue, list) { 702 /* Remove stale work items from the task queue. */ 703 if (iucv_path_table[p->data.ippathid] == NULL) { 704 list_del(&p->list); 705 kfree(p); 706 } 707 } 708 spin_unlock_irq(&iucv_queue_lock); 709 } 710 711 /** 712 * iucv_register: 713 * @handler: address of iucv handler structure 714 * @smp: != 0 indicates that the handler can deal with out of order messages 715 * 716 * Registers a driver with IUCV. 717 * 718 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid 719 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. 720 */ 721 int iucv_register(struct iucv_handler *handler, int smp) 722 { 723 int rc; 724 725 if (!iucv_available) 726 return -ENOSYS; 727 mutex_lock(&iucv_register_mutex); 728 if (!smp) 729 iucv_nonsmp_handler++; 730 if (list_empty(&iucv_handler_list)) { 731 rc = iucv_enable(); 732 if (rc) 733 goto out_mutex; 734 } else if (!smp && iucv_nonsmp_handler == 1) 735 iucv_setmask_up(); 736 INIT_LIST_HEAD(&handler->paths); 737 738 spin_lock_bh(&iucv_table_lock); 739 list_add_tail(&handler->list, &iucv_handler_list); 740 spin_unlock_bh(&iucv_table_lock); 741 rc = 0; 742 out_mutex: 743 mutex_unlock(&iucv_register_mutex); 744 return rc; 745 } 746 EXPORT_SYMBOL(iucv_register); 747 748 /** 749 * iucv_unregister 750 * @handler: address of iucv handler structure 751 * @smp: != 0 indicates that the handler can deal with out of order messages 752 * 753 * Unregister driver from IUCV. 754 */ 755 void iucv_unregister(struct iucv_handler *handler, int smp) 756 { 757 struct iucv_path *p, *n; 758 759 mutex_lock(&iucv_register_mutex); 760 spin_lock_bh(&iucv_table_lock); 761 /* Remove handler from the iucv_handler_list. */ 762 list_del_init(&handler->list); 763 /* Sever all pathids still referring to the handler. */ 764 list_for_each_entry_safe(p, n, &handler->paths, list) { 765 iucv_sever_pathid(p->pathid, NULL); 766 iucv_path_table[p->pathid] = NULL; 767 list_del(&p->list); 768 iucv_path_free(p); 769 } 770 spin_unlock_bh(&iucv_table_lock); 771 if (!smp) 772 iucv_nonsmp_handler--; 773 if (list_empty(&iucv_handler_list)) 774 iucv_disable(); 775 else if (!smp && iucv_nonsmp_handler == 0) 776 iucv_setmask_mp(); 777 mutex_unlock(&iucv_register_mutex); 778 } 779 EXPORT_SYMBOL(iucv_unregister); 780 781 static int iucv_reboot_event(struct notifier_block *this, 782 unsigned long event, void *ptr) 783 { 784 int i; 785 786 if (cpumask_empty(&iucv_irq_cpumask)) 787 return NOTIFY_DONE; 788 789 cpus_read_lock(); 790 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1); 791 preempt_disable(); 792 for (i = 0; i < iucv_max_pathid; i++) { 793 if (iucv_path_table[i]) 794 iucv_sever_pathid(i, NULL); 795 } 796 preempt_enable(); 797 cpus_read_unlock(); 798 iucv_disable(); 799 return NOTIFY_DONE; 800 } 801 802 static struct notifier_block iucv_reboot_notifier = { 803 .notifier_call = iucv_reboot_event, 804 }; 805 806 /** 807 * iucv_path_accept 808 * @path: address of iucv path structure 809 * @handler: address of iucv handler structure 810 * @userdata: 16 bytes of data reflected to the communication partner 811 * @private: private data passed to interrupt handlers for this path 812 * 813 * This function is issued after the user received a connection pending 814 * external interrupt and now wishes to complete the IUCV communication path. 815 * 816 * Returns the result of the CP IUCV call. 817 */ 818 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, 819 u8 *userdata, void *private) 820 { 821 union iucv_param *parm; 822 int rc; 823 824 local_bh_disable(); 825 if (cpumask_empty(&iucv_buffer_cpumask)) { 826 rc = -EIO; 827 goto out; 828 } 829 /* Prepare parameter block. */ 830 parm = iucv_param[smp_processor_id()]; 831 memset(parm, 0, sizeof(union iucv_param)); 832 parm->ctrl.ippathid = path->pathid; 833 parm->ctrl.ipmsglim = path->msglim; 834 if (userdata) 835 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); 836 parm->ctrl.ipflags1 = path->flags; 837 838 rc = iucv_call_b2f0(IUCV_ACCEPT, parm); 839 if (!rc) { 840 path->private = private; 841 path->msglim = parm->ctrl.ipmsglim; 842 path->flags = parm->ctrl.ipflags1; 843 } 844 out: 845 local_bh_enable(); 846 return rc; 847 } 848 EXPORT_SYMBOL(iucv_path_accept); 849 850 /** 851 * iucv_path_connect 852 * @path: address of iucv path structure 853 * @handler: address of iucv handler structure 854 * @userid: 8-byte user identification 855 * @system: 8-byte target system identification 856 * @userdata: 16 bytes of data reflected to the communication partner 857 * @private: private data passed to interrupt handlers for this path 858 * 859 * This function establishes an IUCV path. Although the connect may complete 860 * successfully, you are not able to use the path until you receive an IUCV 861 * Connection Complete external interrupt. 862 * 863 * Returns the result of the CP IUCV call. 864 */ 865 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, 866 u8 *userid, u8 *system, u8 *userdata, 867 void *private) 868 { 869 union iucv_param *parm; 870 int rc; 871 872 spin_lock_bh(&iucv_table_lock); 873 iucv_cleanup_queue(); 874 if (cpumask_empty(&iucv_buffer_cpumask)) { 875 rc = -EIO; 876 goto out; 877 } 878 parm = iucv_param[smp_processor_id()]; 879 memset(parm, 0, sizeof(union iucv_param)); 880 parm->ctrl.ipmsglim = path->msglim; 881 parm->ctrl.ipflags1 = path->flags; 882 if (userid) { 883 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); 884 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); 885 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); 886 } 887 if (system) { 888 memcpy(parm->ctrl.iptarget, system, 889 sizeof(parm->ctrl.iptarget)); 890 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); 891 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); 892 } 893 if (userdata) 894 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); 895 896 rc = iucv_call_b2f0(IUCV_CONNECT, parm); 897 if (!rc) { 898 if (parm->ctrl.ippathid < iucv_max_pathid) { 899 path->pathid = parm->ctrl.ippathid; 900 path->msglim = parm->ctrl.ipmsglim; 901 path->flags = parm->ctrl.ipflags1; 902 path->handler = handler; 903 path->private = private; 904 list_add_tail(&path->list, &handler->paths); 905 iucv_path_table[path->pathid] = path; 906 } else { 907 iucv_sever_pathid(parm->ctrl.ippathid, 908 iucv_error_pathid); 909 rc = -EIO; 910 } 911 } 912 out: 913 spin_unlock_bh(&iucv_table_lock); 914 return rc; 915 } 916 EXPORT_SYMBOL(iucv_path_connect); 917 918 /** 919 * iucv_path_quiesce: 920 * @path: address of iucv path structure 921 * @userdata: 16 bytes of data reflected to the communication partner 922 * 923 * This function temporarily suspends incoming messages on an IUCV path. 924 * You can later reactivate the path by invoking the iucv_resume function. 925 * 926 * Returns the result from the CP IUCV call. 927 */ 928 int iucv_path_quiesce(struct iucv_path *path, u8 *userdata) 929 { 930 union iucv_param *parm; 931 int rc; 932 933 local_bh_disable(); 934 if (cpumask_empty(&iucv_buffer_cpumask)) { 935 rc = -EIO; 936 goto out; 937 } 938 parm = iucv_param[smp_processor_id()]; 939 memset(parm, 0, sizeof(union iucv_param)); 940 if (userdata) 941 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); 942 parm->ctrl.ippathid = path->pathid; 943 rc = iucv_call_b2f0(IUCV_QUIESCE, parm); 944 out: 945 local_bh_enable(); 946 return rc; 947 } 948 EXPORT_SYMBOL(iucv_path_quiesce); 949 950 /** 951 * iucv_path_resume: 952 * @path: address of iucv path structure 953 * @userdata: 16 bytes of data reflected to the communication partner 954 * 955 * This function resumes incoming messages on an IUCV path that has 956 * been stopped with iucv_path_quiesce. 957 * 958 * Returns the result from the CP IUCV call. 959 */ 960 int iucv_path_resume(struct iucv_path *path, u8 *userdata) 961 { 962 union iucv_param *parm; 963 int rc; 964 965 local_bh_disable(); 966 if (cpumask_empty(&iucv_buffer_cpumask)) { 967 rc = -EIO; 968 goto out; 969 } 970 parm = iucv_param[smp_processor_id()]; 971 memset(parm, 0, sizeof(union iucv_param)); 972 if (userdata) 973 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); 974 parm->ctrl.ippathid = path->pathid; 975 rc = iucv_call_b2f0(IUCV_RESUME, parm); 976 out: 977 local_bh_enable(); 978 return rc; 979 } 980 981 /** 982 * iucv_path_sever 983 * @path: address of iucv path structure 984 * @userdata: 16 bytes of data reflected to the communication partner 985 * 986 * This function terminates an IUCV path. 987 * 988 * Returns the result from the CP IUCV call. 989 */ 990 int iucv_path_sever(struct iucv_path *path, u8 *userdata) 991 { 992 int rc; 993 994 preempt_disable(); 995 if (cpumask_empty(&iucv_buffer_cpumask)) { 996 rc = -EIO; 997 goto out; 998 } 999 if (iucv_active_cpu != smp_processor_id()) 1000 spin_lock_bh(&iucv_table_lock); 1001 rc = iucv_sever_pathid(path->pathid, userdata); 1002 iucv_path_table[path->pathid] = NULL; 1003 list_del_init(&path->list); 1004 if (iucv_active_cpu != smp_processor_id()) 1005 spin_unlock_bh(&iucv_table_lock); 1006 out: 1007 preempt_enable(); 1008 return rc; 1009 } 1010 EXPORT_SYMBOL(iucv_path_sever); 1011 1012 /** 1013 * iucv_message_purge 1014 * @path: address of iucv path structure 1015 * @msg: address of iucv msg structure 1016 * @srccls: source class of message 1017 * 1018 * Cancels a message you have sent. 1019 * 1020 * Returns the result from the CP IUCV call. 1021 */ 1022 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, 1023 u32 srccls) 1024 { 1025 union iucv_param *parm; 1026 int rc; 1027 1028 local_bh_disable(); 1029 if (cpumask_empty(&iucv_buffer_cpumask)) { 1030 rc = -EIO; 1031 goto out; 1032 } 1033 parm = iucv_param[smp_processor_id()]; 1034 memset(parm, 0, sizeof(union iucv_param)); 1035 parm->purge.ippathid = path->pathid; 1036 parm->purge.ipmsgid = msg->id; 1037 parm->purge.ipsrccls = srccls; 1038 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; 1039 rc = iucv_call_b2f0(IUCV_PURGE, parm); 1040 if (!rc) { 1041 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; 1042 msg->tag = parm->purge.ipmsgtag; 1043 } 1044 out: 1045 local_bh_enable(); 1046 return rc; 1047 } 1048 EXPORT_SYMBOL(iucv_message_purge); 1049 1050 /** 1051 * iucv_message_receive_iprmdata 1052 * @path: address of iucv path structure 1053 * @msg: address of iucv msg structure 1054 * @flags: how the message is received (IUCV_IPBUFLST) 1055 * @buffer: address of data buffer or address of struct iucv_array 1056 * @size: length of data buffer 1057 * @residual: 1058 * 1059 * Internal function used by iucv_message_receive and __iucv_message_receive 1060 * to receive RMDATA data stored in struct iucv_message. 1061 */ 1062 static int iucv_message_receive_iprmdata(struct iucv_path *path, 1063 struct iucv_message *msg, 1064 u8 flags, void *buffer, 1065 size_t size, size_t *residual) 1066 { 1067 struct iucv_array *array; 1068 u8 *rmmsg; 1069 size_t copy; 1070 1071 /* 1072 * Message is 8 bytes long and has been stored to the 1073 * message descriptor itself. 1074 */ 1075 if (residual) 1076 *residual = abs(size - 8); 1077 rmmsg = msg->rmmsg; 1078 if (flags & IUCV_IPBUFLST) { 1079 /* Copy to struct iucv_array. */ 1080 size = (size < 8) ? size : 8; 1081 for (array = buffer; size > 0; array++) { 1082 copy = min_t(size_t, size, array->length); 1083 memcpy((u8 *)(addr_t) array->address, 1084 rmmsg, copy); 1085 rmmsg += copy; 1086 size -= copy; 1087 } 1088 } else { 1089 /* Copy to direct buffer. */ 1090 memcpy(buffer, rmmsg, min_t(size_t, size, 8)); 1091 } 1092 return 0; 1093 } 1094 1095 /** 1096 * __iucv_message_receive 1097 * @path: address of iucv path structure 1098 * @msg: address of iucv msg structure 1099 * @flags: how the message is received (IUCV_IPBUFLST) 1100 * @buffer: address of data buffer or address of struct iucv_array 1101 * @size: length of data buffer 1102 * @residual: 1103 * 1104 * This function receives messages that are being sent to you over 1105 * established paths. This function will deal with RMDATA messages 1106 * embedded in struct iucv_message as well. 1107 * 1108 * Locking: no locking 1109 * 1110 * Returns the result from the CP IUCV call. 1111 */ 1112 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, 1113 u8 flags, void *buffer, size_t size, size_t *residual) 1114 { 1115 union iucv_param *parm; 1116 int rc; 1117 1118 if (msg->flags & IUCV_IPRMDATA) 1119 return iucv_message_receive_iprmdata(path, msg, flags, 1120 buffer, size, residual); 1121 if (cpumask_empty(&iucv_buffer_cpumask)) 1122 return -EIO; 1123 1124 parm = iucv_param[smp_processor_id()]; 1125 memset(parm, 0, sizeof(union iucv_param)); 1126 parm->db.ipbfadr1 = (u32)(addr_t) buffer; 1127 parm->db.ipbfln1f = (u32) size; 1128 parm->db.ipmsgid = msg->id; 1129 parm->db.ippathid = path->pathid; 1130 parm->db.iptrgcls = msg->class; 1131 parm->db.ipflags1 = (flags | IUCV_IPFGPID | 1132 IUCV_IPFGMID | IUCV_IPTRGCLS); 1133 rc = iucv_call_b2f0(IUCV_RECEIVE, parm); 1134 if (!rc || rc == 5) { 1135 msg->flags = parm->db.ipflags1; 1136 if (residual) 1137 *residual = parm->db.ipbfln1f; 1138 } 1139 return rc; 1140 } 1141 EXPORT_SYMBOL(__iucv_message_receive); 1142 1143 /** 1144 * iucv_message_receive 1145 * @path: address of iucv path structure 1146 * @msg: address of iucv msg structure 1147 * @flags: how the message is received (IUCV_IPBUFLST) 1148 * @buffer: address of data buffer or address of struct iucv_array 1149 * @size: length of data buffer 1150 * @residual: 1151 * 1152 * This function receives messages that are being sent to you over 1153 * established paths. This function will deal with RMDATA messages 1154 * embedded in struct iucv_message as well. 1155 * 1156 * Locking: local_bh_enable/local_bh_disable 1157 * 1158 * Returns the result from the CP IUCV call. 1159 */ 1160 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, 1161 u8 flags, void *buffer, size_t size, size_t *residual) 1162 { 1163 int rc; 1164 1165 if (msg->flags & IUCV_IPRMDATA) 1166 return iucv_message_receive_iprmdata(path, msg, flags, 1167 buffer, size, residual); 1168 local_bh_disable(); 1169 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); 1170 local_bh_enable(); 1171 return rc; 1172 } 1173 EXPORT_SYMBOL(iucv_message_receive); 1174 1175 /** 1176 * iucv_message_reject 1177 * @path: address of iucv path structure 1178 * @msg: address of iucv msg structure 1179 * 1180 * The reject function refuses a specified message. Between the time you 1181 * are notified of a message and the time that you complete the message, 1182 * the message may be rejected. 1183 * 1184 * Returns the result from the CP IUCV call. 1185 */ 1186 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) 1187 { 1188 union iucv_param *parm; 1189 int rc; 1190 1191 local_bh_disable(); 1192 if (cpumask_empty(&iucv_buffer_cpumask)) { 1193 rc = -EIO; 1194 goto out; 1195 } 1196 parm = iucv_param[smp_processor_id()]; 1197 memset(parm, 0, sizeof(union iucv_param)); 1198 parm->db.ippathid = path->pathid; 1199 parm->db.ipmsgid = msg->id; 1200 parm->db.iptrgcls = msg->class; 1201 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); 1202 rc = iucv_call_b2f0(IUCV_REJECT, parm); 1203 out: 1204 local_bh_enable(); 1205 return rc; 1206 } 1207 EXPORT_SYMBOL(iucv_message_reject); 1208 1209 /** 1210 * iucv_message_reply 1211 * @path: address of iucv path structure 1212 * @msg: address of iucv msg structure 1213 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) 1214 * @reply: address of reply data buffer or address of struct iucv_array 1215 * @size: length of reply data buffer 1216 * 1217 * This function responds to the two-way messages that you receive. You 1218 * must identify completely the message to which you wish to reply. ie, 1219 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into 1220 * the parameter list. 1221 * 1222 * Returns the result from the CP IUCV call. 1223 */ 1224 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, 1225 u8 flags, void *reply, size_t size) 1226 { 1227 union iucv_param *parm; 1228 int rc; 1229 1230 local_bh_disable(); 1231 if (cpumask_empty(&iucv_buffer_cpumask)) { 1232 rc = -EIO; 1233 goto out; 1234 } 1235 parm = iucv_param[smp_processor_id()]; 1236 memset(parm, 0, sizeof(union iucv_param)); 1237 if (flags & IUCV_IPRMDATA) { 1238 parm->dpl.ippathid = path->pathid; 1239 parm->dpl.ipflags1 = flags; 1240 parm->dpl.ipmsgid = msg->id; 1241 parm->dpl.iptrgcls = msg->class; 1242 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); 1243 } else { 1244 parm->db.ipbfadr1 = (u32)(addr_t) reply; 1245 parm->db.ipbfln1f = (u32) size; 1246 parm->db.ippathid = path->pathid; 1247 parm->db.ipflags1 = flags; 1248 parm->db.ipmsgid = msg->id; 1249 parm->db.iptrgcls = msg->class; 1250 } 1251 rc = iucv_call_b2f0(IUCV_REPLY, parm); 1252 out: 1253 local_bh_enable(); 1254 return rc; 1255 } 1256 EXPORT_SYMBOL(iucv_message_reply); 1257 1258 /** 1259 * __iucv_message_send 1260 * @path: address of iucv path structure 1261 * @msg: address of iucv msg structure 1262 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) 1263 * @srccls: source class of message 1264 * @buffer: address of send buffer or address of struct iucv_array 1265 * @size: length of send buffer 1266 * 1267 * This function transmits data to another application. Data to be 1268 * transmitted is in a buffer and this is a one-way message and the 1269 * receiver will not reply to the message. 1270 * 1271 * Locking: no locking 1272 * 1273 * Returns the result from the CP IUCV call. 1274 */ 1275 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, 1276 u8 flags, u32 srccls, void *buffer, size_t size) 1277 { 1278 union iucv_param *parm; 1279 int rc; 1280 1281 if (cpumask_empty(&iucv_buffer_cpumask)) { 1282 rc = -EIO; 1283 goto out; 1284 } 1285 parm = iucv_param[smp_processor_id()]; 1286 memset(parm, 0, sizeof(union iucv_param)); 1287 if (flags & IUCV_IPRMDATA) { 1288 /* Message of 8 bytes can be placed into the parameter list. */ 1289 parm->dpl.ippathid = path->pathid; 1290 parm->dpl.ipflags1 = flags | IUCV_IPNORPY; 1291 parm->dpl.iptrgcls = msg->class; 1292 parm->dpl.ipsrccls = srccls; 1293 parm->dpl.ipmsgtag = msg->tag; 1294 memcpy(parm->dpl.iprmmsg, buffer, 8); 1295 } else { 1296 parm->db.ipbfadr1 = (u32)(addr_t) buffer; 1297 parm->db.ipbfln1f = (u32) size; 1298 parm->db.ippathid = path->pathid; 1299 parm->db.ipflags1 = flags | IUCV_IPNORPY; 1300 parm->db.iptrgcls = msg->class; 1301 parm->db.ipsrccls = srccls; 1302 parm->db.ipmsgtag = msg->tag; 1303 } 1304 rc = iucv_call_b2f0(IUCV_SEND, parm); 1305 if (!rc) 1306 msg->id = parm->db.ipmsgid; 1307 out: 1308 return rc; 1309 } 1310 EXPORT_SYMBOL(__iucv_message_send); 1311 1312 /** 1313 * iucv_message_send 1314 * @path: address of iucv path structure 1315 * @msg: address of iucv msg structure 1316 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) 1317 * @srccls: source class of message 1318 * @buffer: address of send buffer or address of struct iucv_array 1319 * @size: length of send buffer 1320 * 1321 * This function transmits data to another application. Data to be 1322 * transmitted is in a buffer and this is a one-way message and the 1323 * receiver will not reply to the message. 1324 * 1325 * Locking: local_bh_enable/local_bh_disable 1326 * 1327 * Returns the result from the CP IUCV call. 1328 */ 1329 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, 1330 u8 flags, u32 srccls, void *buffer, size_t size) 1331 { 1332 int rc; 1333 1334 local_bh_disable(); 1335 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); 1336 local_bh_enable(); 1337 return rc; 1338 } 1339 EXPORT_SYMBOL(iucv_message_send); 1340 1341 /** 1342 * iucv_message_send2way 1343 * @path: address of iucv path structure 1344 * @msg: address of iucv msg structure 1345 * @flags: how the message is sent and the reply is received 1346 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) 1347 * @srccls: source class of message 1348 * @buffer: address of send buffer or address of struct iucv_array 1349 * @size: length of send buffer 1350 * @answer: address of answer buffer or address of struct iucv_array 1351 * @asize: size of reply buffer 1352 * @residual: ignored 1353 * 1354 * This function transmits data to another application. Data to be 1355 * transmitted is in a buffer. The receiver of the send is expected to 1356 * reply to the message and a buffer is provided into which IUCV moves 1357 * the reply to this message. 1358 * 1359 * Returns the result from the CP IUCV call. 1360 */ 1361 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, 1362 u8 flags, u32 srccls, void *buffer, size_t size, 1363 void *answer, size_t asize, size_t *residual) 1364 { 1365 union iucv_param *parm; 1366 int rc; 1367 1368 local_bh_disable(); 1369 if (cpumask_empty(&iucv_buffer_cpumask)) { 1370 rc = -EIO; 1371 goto out; 1372 } 1373 parm = iucv_param[smp_processor_id()]; 1374 memset(parm, 0, sizeof(union iucv_param)); 1375 if (flags & IUCV_IPRMDATA) { 1376 parm->dpl.ippathid = path->pathid; 1377 parm->dpl.ipflags1 = path->flags; /* priority message */ 1378 parm->dpl.iptrgcls = msg->class; 1379 parm->dpl.ipsrccls = srccls; 1380 parm->dpl.ipmsgtag = msg->tag; 1381 parm->dpl.ipbfadr2 = (u32)(addr_t) answer; 1382 parm->dpl.ipbfln2f = (u32) asize; 1383 memcpy(parm->dpl.iprmmsg, buffer, 8); 1384 } else { 1385 parm->db.ippathid = path->pathid; 1386 parm->db.ipflags1 = path->flags; /* priority message */ 1387 parm->db.iptrgcls = msg->class; 1388 parm->db.ipsrccls = srccls; 1389 parm->db.ipmsgtag = msg->tag; 1390 parm->db.ipbfadr1 = (u32)(addr_t) buffer; 1391 parm->db.ipbfln1f = (u32) size; 1392 parm->db.ipbfadr2 = (u32)(addr_t) answer; 1393 parm->db.ipbfln2f = (u32) asize; 1394 } 1395 rc = iucv_call_b2f0(IUCV_SEND, parm); 1396 if (!rc) 1397 msg->id = parm->db.ipmsgid; 1398 out: 1399 local_bh_enable(); 1400 return rc; 1401 } 1402 EXPORT_SYMBOL(iucv_message_send2way); 1403 1404 struct iucv_path_pending { 1405 u16 ippathid; 1406 u8 ipflags1; 1407 u8 iptype; 1408 u16 ipmsglim; 1409 u16 res1; 1410 u8 ipvmid[8]; 1411 u8 ipuser[16]; 1412 u32 res3; 1413 u8 ippollfg; 1414 u8 res4[3]; 1415 } __packed; 1416 1417 /** 1418 * iucv_path_pending 1419 * @data: Pointer to external interrupt buffer 1420 * 1421 * Process connection pending work item. Called from tasklet while holding 1422 * iucv_table_lock. 1423 */ 1424 static void iucv_path_pending(struct iucv_irq_data *data) 1425 { 1426 struct iucv_path_pending *ipp = (void *) data; 1427 struct iucv_handler *handler; 1428 struct iucv_path *path; 1429 char *error; 1430 1431 BUG_ON(iucv_path_table[ipp->ippathid]); 1432 /* New pathid, handler found. Create a new path struct. */ 1433 error = iucv_error_no_memory; 1434 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); 1435 if (!path) 1436 goto out_sever; 1437 path->pathid = ipp->ippathid; 1438 iucv_path_table[path->pathid] = path; 1439 EBCASC(ipp->ipvmid, 8); 1440 1441 /* Call registered handler until one is found that wants the path. */ 1442 list_for_each_entry(handler, &iucv_handler_list, list) { 1443 if (!handler->path_pending) 1444 continue; 1445 /* 1446 * Add path to handler to allow a call to iucv_path_sever 1447 * inside the path_pending function. If the handler returns 1448 * an error remove the path from the handler again. 1449 */ 1450 list_add(&path->list, &handler->paths); 1451 path->handler = handler; 1452 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) 1453 return; 1454 list_del(&path->list); 1455 path->handler = NULL; 1456 } 1457 /* No handler wanted the path. */ 1458 iucv_path_table[path->pathid] = NULL; 1459 iucv_path_free(path); 1460 error = iucv_error_no_listener; 1461 out_sever: 1462 iucv_sever_pathid(ipp->ippathid, error); 1463 } 1464 1465 struct iucv_path_complete { 1466 u16 ippathid; 1467 u8 ipflags1; 1468 u8 iptype; 1469 u16 ipmsglim; 1470 u16 res1; 1471 u8 res2[8]; 1472 u8 ipuser[16]; 1473 u32 res3; 1474 u8 ippollfg; 1475 u8 res4[3]; 1476 } __packed; 1477 1478 /** 1479 * iucv_path_complete 1480 * @data: Pointer to external interrupt buffer 1481 * 1482 * Process connection complete work item. Called from tasklet while holding 1483 * iucv_table_lock. 1484 */ 1485 static void iucv_path_complete(struct iucv_irq_data *data) 1486 { 1487 struct iucv_path_complete *ipc = (void *) data; 1488 struct iucv_path *path = iucv_path_table[ipc->ippathid]; 1489 1490 if (path) 1491 path->flags = ipc->ipflags1; 1492 if (path && path->handler && path->handler->path_complete) 1493 path->handler->path_complete(path, ipc->ipuser); 1494 } 1495 1496 struct iucv_path_severed { 1497 u16 ippathid; 1498 u8 res1; 1499 u8 iptype; 1500 u32 res2; 1501 u8 res3[8]; 1502 u8 ipuser[16]; 1503 u32 res4; 1504 u8 ippollfg; 1505 u8 res5[3]; 1506 } __packed; 1507 1508 /** 1509 * iucv_path_severed 1510 * @data: Pointer to external interrupt buffer 1511 * 1512 * Process connection severed work item. Called from tasklet while holding 1513 * iucv_table_lock. 1514 */ 1515 static void iucv_path_severed(struct iucv_irq_data *data) 1516 { 1517 struct iucv_path_severed *ips = (void *) data; 1518 struct iucv_path *path = iucv_path_table[ips->ippathid]; 1519 1520 if (!path || !path->handler) /* Already severed */ 1521 return; 1522 if (path->handler->path_severed) 1523 path->handler->path_severed(path, ips->ipuser); 1524 else { 1525 iucv_sever_pathid(path->pathid, NULL); 1526 iucv_path_table[path->pathid] = NULL; 1527 list_del(&path->list); 1528 iucv_path_free(path); 1529 } 1530 } 1531 1532 struct iucv_path_quiesced { 1533 u16 ippathid; 1534 u8 res1; 1535 u8 iptype; 1536 u32 res2; 1537 u8 res3[8]; 1538 u8 ipuser[16]; 1539 u32 res4; 1540 u8 ippollfg; 1541 u8 res5[3]; 1542 } __packed; 1543 1544 /** 1545 * iucv_path_quiesced 1546 * @data: Pointer to external interrupt buffer 1547 * 1548 * Process connection quiesced work item. Called from tasklet while holding 1549 * iucv_table_lock. 1550 */ 1551 static void iucv_path_quiesced(struct iucv_irq_data *data) 1552 { 1553 struct iucv_path_quiesced *ipq = (void *) data; 1554 struct iucv_path *path = iucv_path_table[ipq->ippathid]; 1555 1556 if (path && path->handler && path->handler->path_quiesced) 1557 path->handler->path_quiesced(path, ipq->ipuser); 1558 } 1559 1560 struct iucv_path_resumed { 1561 u16 ippathid; 1562 u8 res1; 1563 u8 iptype; 1564 u32 res2; 1565 u8 res3[8]; 1566 u8 ipuser[16]; 1567 u32 res4; 1568 u8 ippollfg; 1569 u8 res5[3]; 1570 } __packed; 1571 1572 /** 1573 * iucv_path_resumed 1574 * @data: Pointer to external interrupt buffer 1575 * 1576 * Process connection resumed work item. Called from tasklet while holding 1577 * iucv_table_lock. 1578 */ 1579 static void iucv_path_resumed(struct iucv_irq_data *data) 1580 { 1581 struct iucv_path_resumed *ipr = (void *) data; 1582 struct iucv_path *path = iucv_path_table[ipr->ippathid]; 1583 1584 if (path && path->handler && path->handler->path_resumed) 1585 path->handler->path_resumed(path, ipr->ipuser); 1586 } 1587 1588 struct iucv_message_complete { 1589 u16 ippathid; 1590 u8 ipflags1; 1591 u8 iptype; 1592 u32 ipmsgid; 1593 u32 ipaudit; 1594 u8 iprmmsg[8]; 1595 u32 ipsrccls; 1596 u32 ipmsgtag; 1597 u32 res; 1598 u32 ipbfln2f; 1599 u8 ippollfg; 1600 u8 res2[3]; 1601 } __packed; 1602 1603 /** 1604 * iucv_message_complete 1605 * @data: Pointer to external interrupt buffer 1606 * 1607 * Process message complete work item. Called from tasklet while holding 1608 * iucv_table_lock. 1609 */ 1610 static void iucv_message_complete(struct iucv_irq_data *data) 1611 { 1612 struct iucv_message_complete *imc = (void *) data; 1613 struct iucv_path *path = iucv_path_table[imc->ippathid]; 1614 struct iucv_message msg; 1615 1616 if (path && path->handler && path->handler->message_complete) { 1617 msg.flags = imc->ipflags1; 1618 msg.id = imc->ipmsgid; 1619 msg.audit = imc->ipaudit; 1620 memcpy(msg.rmmsg, imc->iprmmsg, 8); 1621 msg.class = imc->ipsrccls; 1622 msg.tag = imc->ipmsgtag; 1623 msg.length = imc->ipbfln2f; 1624 path->handler->message_complete(path, &msg); 1625 } 1626 } 1627 1628 struct iucv_message_pending { 1629 u16 ippathid; 1630 u8 ipflags1; 1631 u8 iptype; 1632 u32 ipmsgid; 1633 u32 iptrgcls; 1634 struct { 1635 union { 1636 u32 iprmmsg1_u32; 1637 u8 iprmmsg1[4]; 1638 } ln1msg1; 1639 union { 1640 u32 ipbfln1f; 1641 u8 iprmmsg2[4]; 1642 } ln1msg2; 1643 } rmmsg; 1644 u32 res1[3]; 1645 u32 ipbfln2f; 1646 u8 ippollfg; 1647 u8 res2[3]; 1648 } __packed; 1649 1650 /** 1651 * iucv_message_pending 1652 * @data: Pointer to external interrupt buffer 1653 * 1654 * Process message pending work item. Called from tasklet while holding 1655 * iucv_table_lock. 1656 */ 1657 static void iucv_message_pending(struct iucv_irq_data *data) 1658 { 1659 struct iucv_message_pending *imp = (void *) data; 1660 struct iucv_path *path = iucv_path_table[imp->ippathid]; 1661 struct iucv_message msg; 1662 1663 if (path && path->handler && path->handler->message_pending) { 1664 msg.flags = imp->ipflags1; 1665 msg.id = imp->ipmsgid; 1666 msg.class = imp->iptrgcls; 1667 if (imp->ipflags1 & IUCV_IPRMDATA) { 1668 memcpy(msg.rmmsg, &imp->rmmsg, 8); 1669 msg.length = 8; 1670 } else 1671 msg.length = imp->rmmsg.ln1msg2.ipbfln1f; 1672 msg.reply_size = imp->ipbfln2f; 1673 path->handler->message_pending(path, &msg); 1674 } 1675 } 1676 1677 /* 1678 * iucv_tasklet_fn: 1679 * 1680 * This tasklet loops over the queue of irq buffers created by 1681 * iucv_external_interrupt, calls the appropriate action handler 1682 * and then frees the buffer. 1683 */ 1684 static void iucv_tasklet_fn(unsigned long ignored) 1685 { 1686 typedef void iucv_irq_fn(struct iucv_irq_data *); 1687 static iucv_irq_fn *irq_fn[] = { 1688 [0x02] = iucv_path_complete, 1689 [0x03] = iucv_path_severed, 1690 [0x04] = iucv_path_quiesced, 1691 [0x05] = iucv_path_resumed, 1692 [0x06] = iucv_message_complete, 1693 [0x07] = iucv_message_complete, 1694 [0x08] = iucv_message_pending, 1695 [0x09] = iucv_message_pending, 1696 }; 1697 LIST_HEAD(task_queue); 1698 struct iucv_irq_list *p, *n; 1699 1700 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ 1701 if (!spin_trylock(&iucv_table_lock)) { 1702 tasklet_schedule(&iucv_tasklet); 1703 return; 1704 } 1705 iucv_active_cpu = smp_processor_id(); 1706 1707 spin_lock_irq(&iucv_queue_lock); 1708 list_splice_init(&iucv_task_queue, &task_queue); 1709 spin_unlock_irq(&iucv_queue_lock); 1710 1711 list_for_each_entry_safe(p, n, &task_queue, list) { 1712 list_del_init(&p->list); 1713 irq_fn[p->data.iptype](&p->data); 1714 kfree(p); 1715 } 1716 1717 iucv_active_cpu = -1; 1718 spin_unlock(&iucv_table_lock); 1719 } 1720 1721 /* 1722 * iucv_work_fn: 1723 * 1724 * This work function loops over the queue of path pending irq blocks 1725 * created by iucv_external_interrupt, calls the appropriate action 1726 * handler and then frees the buffer. 1727 */ 1728 static void iucv_work_fn(struct work_struct *work) 1729 { 1730 LIST_HEAD(work_queue); 1731 struct iucv_irq_list *p, *n; 1732 1733 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ 1734 spin_lock_bh(&iucv_table_lock); 1735 iucv_active_cpu = smp_processor_id(); 1736 1737 spin_lock_irq(&iucv_queue_lock); 1738 list_splice_init(&iucv_work_queue, &work_queue); 1739 spin_unlock_irq(&iucv_queue_lock); 1740 1741 iucv_cleanup_queue(); 1742 list_for_each_entry_safe(p, n, &work_queue, list) { 1743 list_del_init(&p->list); 1744 iucv_path_pending(&p->data); 1745 kfree(p); 1746 } 1747 1748 iucv_active_cpu = -1; 1749 spin_unlock_bh(&iucv_table_lock); 1750 } 1751 1752 /* 1753 * iucv_external_interrupt 1754 * 1755 * Handles external interrupts coming in from CP. 1756 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). 1757 */ 1758 static void iucv_external_interrupt(struct ext_code ext_code, 1759 unsigned int param32, unsigned long param64) 1760 { 1761 struct iucv_irq_data *p; 1762 struct iucv_irq_list *work; 1763 1764 inc_irq_stat(IRQEXT_IUC); 1765 p = iucv_irq_data[smp_processor_id()]; 1766 if (p->ippathid >= iucv_max_pathid) { 1767 WARN_ON(p->ippathid >= iucv_max_pathid); 1768 iucv_sever_pathid(p->ippathid, iucv_error_no_listener); 1769 return; 1770 } 1771 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); 1772 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); 1773 if (!work) { 1774 pr_warn("iucv_external_interrupt: out of memory\n"); 1775 return; 1776 } 1777 memcpy(&work->data, p, sizeof(work->data)); 1778 spin_lock(&iucv_queue_lock); 1779 if (p->iptype == 0x01) { 1780 /* Path pending interrupt. */ 1781 list_add_tail(&work->list, &iucv_work_queue); 1782 schedule_work(&iucv_work); 1783 } else { 1784 /* The other interrupts. */ 1785 list_add_tail(&work->list, &iucv_task_queue); 1786 tasklet_schedule(&iucv_tasklet); 1787 } 1788 spin_unlock(&iucv_queue_lock); 1789 } 1790 1791 struct iucv_interface iucv_if = { 1792 .message_receive = iucv_message_receive, 1793 .__message_receive = __iucv_message_receive, 1794 .message_reply = iucv_message_reply, 1795 .message_reject = iucv_message_reject, 1796 .message_send = iucv_message_send, 1797 .__message_send = __iucv_message_send, 1798 .message_send2way = iucv_message_send2way, 1799 .message_purge = iucv_message_purge, 1800 .path_accept = iucv_path_accept, 1801 .path_connect = iucv_path_connect, 1802 .path_quiesce = iucv_path_quiesce, 1803 .path_resume = iucv_path_resume, 1804 .path_sever = iucv_path_sever, 1805 .iucv_register = iucv_register, 1806 .iucv_unregister = iucv_unregister, 1807 .bus = NULL, 1808 .root = NULL, 1809 }; 1810 EXPORT_SYMBOL(iucv_if); 1811 1812 static enum cpuhp_state iucv_online; 1813 /** 1814 * iucv_init 1815 * 1816 * Allocates and initializes various data structures. 1817 */ 1818 static int __init iucv_init(void) 1819 { 1820 int rc; 1821 1822 if (!MACHINE_IS_VM) { 1823 rc = -EPROTONOSUPPORT; 1824 goto out; 1825 } 1826 ctl_set_bit(0, 1); 1827 rc = iucv_query_maxconn(); 1828 if (rc) 1829 goto out_ctl; 1830 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); 1831 if (rc) 1832 goto out_ctl; 1833 iucv_root = root_device_register("iucv"); 1834 if (IS_ERR(iucv_root)) { 1835 rc = PTR_ERR(iucv_root); 1836 goto out_int; 1837 } 1838 1839 rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare", 1840 iucv_cpu_prepare, iucv_cpu_dead); 1841 if (rc) 1842 goto out_dev; 1843 rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online", 1844 iucv_cpu_online, iucv_cpu_down_prep); 1845 if (rc < 0) 1846 goto out_prep; 1847 iucv_online = rc; 1848 1849 rc = register_reboot_notifier(&iucv_reboot_notifier); 1850 if (rc) 1851 goto out_remove_hp; 1852 ASCEBC(iucv_error_no_listener, 16); 1853 ASCEBC(iucv_error_no_memory, 16); 1854 ASCEBC(iucv_error_pathid, 16); 1855 iucv_available = 1; 1856 rc = bus_register(&iucv_bus); 1857 if (rc) 1858 goto out_reboot; 1859 iucv_if.root = iucv_root; 1860 iucv_if.bus = &iucv_bus; 1861 return 0; 1862 1863 out_reboot: 1864 unregister_reboot_notifier(&iucv_reboot_notifier); 1865 out_remove_hp: 1866 cpuhp_remove_state(iucv_online); 1867 out_prep: 1868 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); 1869 out_dev: 1870 root_device_unregister(iucv_root); 1871 out_int: 1872 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); 1873 out_ctl: 1874 ctl_clear_bit(0, 1); 1875 out: 1876 return rc; 1877 } 1878 1879 /** 1880 * iucv_exit 1881 * 1882 * Frees everything allocated from iucv_init. 1883 */ 1884 static void __exit iucv_exit(void) 1885 { 1886 struct iucv_irq_list *p, *n; 1887 1888 spin_lock_irq(&iucv_queue_lock); 1889 list_for_each_entry_safe(p, n, &iucv_task_queue, list) 1890 kfree(p); 1891 list_for_each_entry_safe(p, n, &iucv_work_queue, list) 1892 kfree(p); 1893 spin_unlock_irq(&iucv_queue_lock); 1894 unregister_reboot_notifier(&iucv_reboot_notifier); 1895 1896 cpuhp_remove_state_nocalls(iucv_online); 1897 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); 1898 root_device_unregister(iucv_root); 1899 bus_unregister(&iucv_bus); 1900 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); 1901 } 1902 1903 subsys_initcall(iucv_init); 1904 module_exit(iucv_exit); 1905 1906 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); 1907 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); 1908 MODULE_LICENSE("GPL"); 1909