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1/*
2 * IUCV base infrastructure.
3 *
4 * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s):
6 * Original source:
7 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
8 * Xenia Tkatschow (xenia@us.ibm.com)
9 * 2Gb awareness and general cleanup:
10 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
11 * Rewritten for af_iucv:
12 * Martin Schwidefsky <schwidefsky@de.ibm.com>
13 *
14 * Documentation used:
15 * The original source
16 * CP Programming Service, IBM document # SC24-5760
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2, or (at your option)
21 * any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
33#include <linux/module.h>
34#include <linux/moduleparam.h>
35
36#include <linux/spinlock.h>
37#include <linux/kernel.h>
38#include <linux/slab.h>
39#include <linux/init.h>
40#include <linux/interrupt.h>
41#include <linux/list.h>
42#include <linux/errno.h>
43#include <linux/err.h>
44#include <linux/device.h>
45#include <linux/cpu.h>
46#include <net/iucv/iucv.h>
47#include <asm/atomic.h>
48#include <asm/ebcdic.h>
49#include <asm/io.h>
50#include <asm/s390_ext.h>
51#include <asm/s390_rdev.h>
52#include <asm/smp.h>
53
54/*
55 * FLAGS:
56 * All flags are defined in the field IPFLAGS1 of each function
57 * and can be found in CP Programming Services.
58 * IPSRCCLS - Indicates you have specified a source class.
59 * IPTRGCLS - Indicates you have specified a target class.
60 * IPFGPID - Indicates you have specified a pathid.
61 * IPFGMID - Indicates you have specified a message ID.
62 * IPNORPY - Indicates a one-way message. No reply expected.
63 * IPALL - Indicates that all paths are affected.
64 */
65#define IUCV_IPSRCCLS 0x01
66#define IUCV_IPTRGCLS 0x01
67#define IUCV_IPFGPID 0x02
68#define IUCV_IPFGMID 0x04
69#define IUCV_IPNORPY 0x10
70#define IUCV_IPALL 0x80
71
72static int iucv_bus_match (struct device *dev, struct device_driver *drv)
73{
74 return 0;
75}
76
77struct bus_type iucv_bus = {
78 .name = "iucv",
79 .match = iucv_bus_match,
80};
81
82struct device *iucv_root;
83static int iucv_available;
84
85/* General IUCV interrupt structure */
86struct iucv_irq_data {
87 u16 ippathid;
88 u8 ipflags1;
89 u8 iptype;
90 u32 res2[8];
91};
92
93struct iucv_work {
94 struct list_head list;
95 struct iucv_irq_data data;
96};
97
98static LIST_HEAD(iucv_work_queue);
99static DEFINE_SPINLOCK(iucv_work_lock);
100
101static struct iucv_irq_data *iucv_irq_data;
102static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
103static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
104
105static void iucv_tasklet_handler(unsigned long);
106static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_handler,0);
107
108enum iucv_command_codes {
109 IUCV_QUERY = 0,
110 IUCV_RETRIEVE_BUFFER = 2,
111 IUCV_SEND = 4,
112 IUCV_RECEIVE = 5,
113 IUCV_REPLY = 6,
114 IUCV_REJECT = 8,
115 IUCV_PURGE = 9,
116 IUCV_ACCEPT = 10,
117 IUCV_CONNECT = 11,
118 IUCV_DECLARE_BUFFER = 12,
119 IUCV_QUIESCE = 13,
120 IUCV_RESUME = 14,
121 IUCV_SEVER = 15,
122 IUCV_SETMASK = 16,
123};
124
125/*
126 * Error messages that are used with the iucv_sever function. They get
127 * converted to EBCDIC.
128 */
129static char iucv_error_no_listener[16] = "NO LISTENER";
130static char iucv_error_no_memory[16] = "NO MEMORY";
131static char iucv_error_pathid[16] = "INVALID PATHID";
132
133/*
134 * iucv_handler_list: List of registered handlers.
135 */
136static LIST_HEAD(iucv_handler_list);
137
138/*
139 * iucv_path_table: an array of iucv_path structures.
140 */
141static struct iucv_path **iucv_path_table;
142static unsigned long iucv_max_pathid;
143
144/*
145 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
146 */
147static DEFINE_SPINLOCK(iucv_table_lock);
148
149/*
150 * iucv_tasklet_cpu: contains the number of the cpu executing the tasklet.
151 * Needed for iucv_path_sever called from tasklet.
152 */
153static int iucv_tasklet_cpu = -1;
154
155/*
156 * Mutex and wait queue for iucv_register/iucv_unregister.
157 */
158static DEFINE_MUTEX(iucv_register_mutex);
159
160/*
161 * Counter for number of non-smp capable handlers.
162 */
163static int iucv_nonsmp_handler;
164
165/*
166 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
167 * iucv_path_quiesce and iucv_path_sever.
168 */
169struct iucv_cmd_control {
170 u16 ippathid;
171 u8 ipflags1;
172 u8 iprcode;
173 u16 ipmsglim;
174 u16 res1;
175 u8 ipvmid[8];
176 u8 ipuser[16];
177 u8 iptarget[8];
178} __attribute__ ((packed,aligned(8)));
179
180/*
181 * Data in parameter list iucv structure. Used by iucv_message_send,
182 * iucv_message_send2way and iucv_message_reply.
183 */
184struct iucv_cmd_dpl {
185 u16 ippathid;
186 u8 ipflags1;
187 u8 iprcode;
188 u32 ipmsgid;
189 u32 iptrgcls;
190 u8 iprmmsg[8];
191 u32 ipsrccls;
192 u32 ipmsgtag;
193 u32 ipbfadr2;
194 u32 ipbfln2f;
195 u32 res;
196} __attribute__ ((packed,aligned(8)));
197
198/*
199 * Data in buffer iucv structure. Used by iucv_message_receive,
200 * iucv_message_reject, iucv_message_send, iucv_message_send2way
201 * and iucv_declare_cpu.
202 */
203struct iucv_cmd_db {
204 u16 ippathid;
205 u8 ipflags1;
206 u8 iprcode;
207 u32 ipmsgid;
208 u32 iptrgcls;
209 u32 ipbfadr1;
210 u32 ipbfln1f;
211 u32 ipsrccls;
212 u32 ipmsgtag;
213 u32 ipbfadr2;
214 u32 ipbfln2f;
215 u32 res;
216} __attribute__ ((packed,aligned(8)));
217
218/*
219 * Purge message iucv structure. Used by iucv_message_purge.
220 */
221struct iucv_cmd_purge {
222 u16 ippathid;
223 u8 ipflags1;
224 u8 iprcode;
225 u32 ipmsgid;
226 u8 ipaudit[3];
227 u8 res1[5];
228 u32 res2;
229 u32 ipsrccls;
230 u32 ipmsgtag;
231 u32 res3[3];
232} __attribute__ ((packed,aligned(8)));
233
234/*
235 * Set mask iucv structure. Used by iucv_enable_cpu.
236 */
237struct iucv_cmd_set_mask {
238 u8 ipmask;
239 u8 res1[2];
240 u8 iprcode;
241 u32 res2[9];
242} __attribute__ ((packed,aligned(8)));
243
244union iucv_param {
245 struct iucv_cmd_control ctrl;
246 struct iucv_cmd_dpl dpl;
247 struct iucv_cmd_db db;
248 struct iucv_cmd_purge purge;
249 struct iucv_cmd_set_mask set_mask;
250};
251
252/*
253 * Anchor for per-cpu IUCV command parameter block.
254 */
255static union iucv_param *iucv_param;
256
257/**
258 * iucv_call_b2f0
259 * @code: identifier of IUCV call to CP.
260 * @parm: pointer to a struct iucv_parm block
261 *
262 * Calls CP to execute IUCV commands.
263 *
264 * Returns the result of the CP IUCV call.
265 */
266static inline int iucv_call_b2f0(int command, union iucv_param *parm)
267{
268 register unsigned long reg0 asm ("0");
269 register unsigned long reg1 asm ("1");
270 int ccode;
271
272 reg0 = command;
273 reg1 = virt_to_phys(parm);
274 asm volatile(
275 " .long 0xb2f01000\n"
276 " ipm %0\n"
277 " srl %0,28\n"
278 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
279 : "m" (*parm) : "cc");
280 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
281}
282
283/**
284 * iucv_query_maxconn
285 *
286 * Determines the maximum number of connections that may be established.
287 *
288 * Returns the maximum number of connections or -EPERM is IUCV is not
289 * available.
290 */
291static int iucv_query_maxconn(void)
292{
293 register unsigned long reg0 asm ("0");
294 register unsigned long reg1 asm ("1");
295 void *param;
296 int ccode;
297
298 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
299 if (!param)
300 return -ENOMEM;
301 reg0 = IUCV_QUERY;
302 reg1 = (unsigned long) param;
303 asm volatile (
304 " .long 0xb2f01000\n"
305 " ipm %0\n"
306 " srl %0,28\n"
307 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
308 if (ccode == 0)
309 iucv_max_pathid = reg0;
310 kfree(param);
311 return ccode ? -EPERM : 0;
312}
313
314/**
315 * iucv_allow_cpu
316 * @data: unused
317 *
318 * Allow iucv interrupts on this cpu.
319 */
320static void iucv_allow_cpu(void *data)
321{
322 int cpu = smp_processor_id();
323 union iucv_param *parm;
324
325 /*
326 * Enable all iucv interrupts.
327 * ipmask contains bits for the different interrupts
328 * 0x80 - Flag to allow nonpriority message pending interrupts
329 * 0x40 - Flag to allow priority message pending interrupts
330 * 0x20 - Flag to allow nonpriority message completion interrupts
331 * 0x10 - Flag to allow priority message completion interrupts
332 * 0x08 - Flag to allow IUCV control interrupts
333 */
334 parm = percpu_ptr(iucv_param, smp_processor_id());
335 memset(parm, 0, sizeof(union iucv_param));
336 parm->set_mask.ipmask = 0xf8;
337 iucv_call_b2f0(IUCV_SETMASK, parm);
338
339 /* Set indication that iucv interrupts are allowed for this cpu. */
340 cpu_set(cpu, iucv_irq_cpumask);
341}
342
343/**
344 * iucv_block_cpu
345 * @data: unused
346 *
347 * Block iucv interrupts on this cpu.
348 */
349static void iucv_block_cpu(void *data)
350{
351 int cpu = smp_processor_id();
352 union iucv_param *parm;
353
354 /* Disable all iucv interrupts. */
355 parm = percpu_ptr(iucv_param, smp_processor_id());
356 memset(parm, 0, sizeof(union iucv_param));
357 iucv_call_b2f0(IUCV_SETMASK, parm);
358
359 /* Clear indication that iucv interrupts are allowed for this cpu. */
360 cpu_clear(cpu, iucv_irq_cpumask);
361}
362
363/**
364 * iucv_declare_cpu
365 * @data: unused
366 *
367 * Declare a interupt buffer on this cpu.
368 */
369static void iucv_declare_cpu(void *data)
370{
371 int cpu = smp_processor_id();
372 union iucv_param *parm;
373 int rc;
374
375 if (cpu_isset(cpu, iucv_buffer_cpumask))
376 return;
377
378 /* Declare interrupt buffer. */
379 parm = percpu_ptr(iucv_param, cpu);
380 memset(parm, 0, sizeof(union iucv_param));
381 parm->db.ipbfadr1 = virt_to_phys(percpu_ptr(iucv_irq_data, cpu));
382 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
383 if (rc) {
384 char *err = "Unknown";
385 switch(rc) {
386 case 0x03:
387 err = "Directory error";
388 break;
389 case 0x0a:
390 err = "Invalid length";
391 break;
392 case 0x13:
393 err = "Buffer already exists";
394 break;
395 case 0x3e:
396 err = "Buffer overlap";
397 break;
398 case 0x5c:
399 err = "Paging or storage error";
400 break;
401 }
402 printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
403 "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
404 return;
405 }
406
407 /* Set indication that an iucv buffer exists for this cpu. */
408 cpu_set(cpu, iucv_buffer_cpumask);
409
410 if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
411 /* Enable iucv interrupts on this cpu. */
412 iucv_allow_cpu(NULL);
413 else
414 /* Disable iucv interrupts on this cpu. */
415 iucv_block_cpu(NULL);
416}
417
418/**
419 * iucv_retrieve_cpu
420 * @data: unused
421 *
422 * Retrieve interrupt buffer on this cpu.
423 */
424static void iucv_retrieve_cpu(void *data)
425{
426 int cpu = smp_processor_id();
427 union iucv_param *parm;
428
429 if (!cpu_isset(cpu, iucv_buffer_cpumask))
430 return;
431
432 /* Block iucv interrupts. */
433 iucv_block_cpu(NULL);
434
435 /* Retrieve interrupt buffer. */
436 parm = percpu_ptr(iucv_param, cpu);
437 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
438
439 /* Clear indication that an iucv buffer exists for this cpu. */
440 cpu_clear(cpu, iucv_buffer_cpumask);
441}
442
443/**
444 * iucv_setmask_smp
445 *
446 * Allow iucv interrupts on all cpus.
447 */
448static void iucv_setmask_mp(void)
449{
450 int cpu;
451
452 for_each_online_cpu(cpu)
453 /* Enable all cpus with a declared buffer. */
454 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
455 !cpu_isset(cpu, iucv_irq_cpumask))
456 smp_call_function_on(iucv_allow_cpu, NULL, 0, 1, cpu);
457}
458
459/**
460 * iucv_setmask_up
461 *
462 * Allow iucv interrupts on a single cpus.
463 */
464static void iucv_setmask_up(void)
465{
466 cpumask_t cpumask;
467 int cpu;
468
469 /* Disable all cpu but the first in cpu_irq_cpumask. */
470 cpumask = iucv_irq_cpumask;
471 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
472 for_each_cpu_mask(cpu, cpumask)
473 smp_call_function_on(iucv_block_cpu, NULL, 0, 1, cpu);
474}
475
476/**
477 * iucv_enable
478 *
479 * This function makes iucv ready for use. It allocates the pathid
480 * table, declares an iucv interrupt buffer and enables the iucv
481 * interrupts. Called when the first user has registered an iucv
482 * handler.
483 */
484static int iucv_enable(void)
485{
486 size_t alloc_size;
487 int cpu, rc;
488
489 rc = -ENOMEM;
490 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
491 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
492 if (!iucv_path_table)
493 goto out;
494 /* Declare per cpu buffers. */
495 rc = -EIO;
496 for_each_online_cpu(cpu)
497 smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
498 if (cpus_empty(iucv_buffer_cpumask))
499 /* No cpu could declare an iucv buffer. */
500 goto out_path;
501 return 0;
502
503out_path:
504 kfree(iucv_path_table);
505out:
506 return rc;
507}
508
509/**
510 * iucv_disable
511 *
512 * This function shuts down iucv. It disables iucv interrupts, retrieves
513 * the iucv interrupt buffer and frees the pathid table. Called after the
514 * last user unregister its iucv handler.
515 */
516static void iucv_disable(void)
517{
518 on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
519 kfree(iucv_path_table);
520}
521
522#ifdef CONFIG_HOTPLUG_CPU
523static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
524 unsigned long action, void *hcpu)
525{
526 cpumask_t cpumask;
527 long cpu = (long) hcpu;
528
529 switch (action) {
530 case CPU_UP_PREPARE:
531 if (!percpu_populate(iucv_irq_data,
532 sizeof(struct iucv_irq_data),
533 GFP_KERNEL|GFP_DMA, cpu))
534 return NOTIFY_BAD;
535 if (!percpu_populate(iucv_param, sizeof(union iucv_param),
536 GFP_KERNEL|GFP_DMA, cpu)) {
537 percpu_depopulate(iucv_irq_data, cpu);
538 return NOTIFY_BAD;
539 }
540 break;
541 case CPU_UP_CANCELED:
542 case CPU_DEAD:
543 percpu_depopulate(iucv_param, cpu);
544 percpu_depopulate(iucv_irq_data, cpu);
545 break;
546 case CPU_ONLINE:
547 case CPU_DOWN_FAILED:
548 smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
549 break;
550 case CPU_DOWN_PREPARE:
551 cpumask = iucv_buffer_cpumask;
552 cpu_clear(cpu, cpumask);
553 if (cpus_empty(cpumask))
554 /* Can't offline last IUCV enabled cpu. */
555 return NOTIFY_BAD;
556 smp_call_function_on(iucv_retrieve_cpu, NULL, 0, 1, cpu);
557 if (cpus_empty(iucv_irq_cpumask))
558 smp_call_function_on(iucv_allow_cpu, NULL, 0, 1,
559 first_cpu(iucv_buffer_cpumask));
560 break;
561 }
562 return NOTIFY_OK;
563}
564
565static struct notifier_block iucv_cpu_notifier = {
566 .notifier_call = iucv_cpu_notify,
567};
568#endif
569
570/**
571 * iucv_sever_pathid
572 * @pathid: path identification number.
573 * @userdata: 16-bytes of user data.
574 *
575 * Sever an iucv path to free up the pathid. Used internally.
576 */
577static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
578{
579 union iucv_param *parm;
580
581 parm = percpu_ptr(iucv_param, smp_processor_id());
582 memset(parm, 0, sizeof(union iucv_param));
583 if (userdata)
584 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
585 parm->ctrl.ippathid = pathid;
586 return iucv_call_b2f0(IUCV_SEVER, parm);
587}
588
589/**
590 * __iucv_cleanup_pathid
591 * @dummy: unused dummy argument
592 *
593 * Nop function called via smp_call_function to force work items from
594 * pending external iucv interrupts to the work queue.
595 */
596static void __iucv_cleanup_pathid(void *dummy)
597{
598}
599
600/**
601 * iucv_cleanup_pathid
602 * @pathid: 16 bit pathid
603 *
604 * Function called after a path has been severed to find all remaining
605 * work items for the now stale pathid. The caller needs to hold the
606 * iucv_table_lock.
607 */
608static void iucv_cleanup_pathid(u16 pathid)
609{
610 struct iucv_work *p, *n;
611
612 /*
613 * Path is severed, the pathid can be reused immediatly on
614 * a iucv connect or a connection pending interrupt.
615 * iucv_path_connect and connection pending interrupt will
616 * wait until the iucv_table_lock is released before the
617 * recycled pathid enters the system.
618 * Force remaining interrupts to the work queue, then
619 * scan the work queue for items of this path.
620 */
621 smp_call_function(__iucv_cleanup_pathid, NULL, 0, 1);
622 spin_lock_irq(&iucv_work_lock);
623 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
624 /* Remove work items for pathid except connection pending */
625 if (p->data.ippathid == pathid && p->data.iptype != 0x01) {
626 list_del(&p->list);
627 kfree(p);
628 }
629 }
630 spin_unlock_irq(&iucv_work_lock);
631}
632
633/**
634 * iucv_register:
635 * @handler: address of iucv handler structure
636 * @smp: != 0 indicates that the handler can deal with out of order messages
637 *
638 * Registers a driver with IUCV.
639 *
640 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
641 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
642 */
643int iucv_register(struct iucv_handler *handler, int smp)
644{
645 int rc;
646
647 if (!iucv_available)
648 return -ENOSYS;
649 mutex_lock(&iucv_register_mutex);
650 if (!smp)
651 iucv_nonsmp_handler++;
652 if (list_empty(&iucv_handler_list)) {
653 rc = iucv_enable();
654 if (rc)
655 goto out_mutex;
656 } else if (!smp && iucv_nonsmp_handler == 1)
657 iucv_setmask_up();
658 INIT_LIST_HEAD(&handler->paths);
659
660 spin_lock_irq(&iucv_table_lock);
661 list_add_tail(&handler->list, &iucv_handler_list);
662 spin_unlock_irq(&iucv_table_lock);
663 rc = 0;
664out_mutex:
665 mutex_unlock(&iucv_register_mutex);
666 return rc;
667}
668
669/**
670 * iucv_unregister
671 * @handler: address of iucv handler structure
672 * @smp: != 0 indicates that the handler can deal with out of order messages
673 *
674 * Unregister driver from IUCV.
675 */
676void iucv_unregister(struct iucv_handler *handler, int smp)
677{
678 struct iucv_path *p, *n;
679
680 mutex_lock(&iucv_register_mutex);
681 spin_lock_bh(&iucv_table_lock);
682 /* Remove handler from the iucv_handler_list. */
683 list_del_init(&handler->list);
684 /* Sever all pathids still refering to the handler. */
685 list_for_each_entry_safe(p, n, &handler->paths, list) {
686 iucv_sever_pathid(p->pathid, NULL);
687 iucv_path_table[p->pathid] = NULL;
688 list_del(&p->list);
689 iucv_cleanup_pathid(p->pathid);
690 iucv_path_free(p);
691 }
692 spin_unlock_bh(&iucv_table_lock);
693 if (!smp)
694 iucv_nonsmp_handler--;
695 if (list_empty(&iucv_handler_list))
696 iucv_disable();
697 else if (!smp && iucv_nonsmp_handler == 0)
698 iucv_setmask_mp();
699 mutex_unlock(&iucv_register_mutex);
700}
701
702/**
703 * iucv_path_accept
704 * @path: address of iucv path structure
705 * @handler: address of iucv handler structure
706 * @userdata: 16 bytes of data reflected to the communication partner
707 * @private: private data passed to interrupt handlers for this path
708 *
709 * This function is issued after the user received a connection pending
710 * external interrupt and now wishes to complete the IUCV communication path.
711 *
712 * Returns the result of the CP IUCV call.
713 */
714int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
715 u8 userdata[16], void *private)
716{
717 union iucv_param *parm;
718 int rc;
719
720 local_bh_disable();
721 /* Prepare parameter block. */
722 parm = percpu_ptr(iucv_param, smp_processor_id());
723 memset(parm, 0, sizeof(union iucv_param));
724 parm->ctrl.ippathid = path->pathid;
725 parm->ctrl.ipmsglim = path->msglim;
726 if (userdata)
727 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
728 parm->ctrl.ipflags1 = path->flags;
729
730 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
731 if (!rc) {
732 path->private = private;
733 path->msglim = parm->ctrl.ipmsglim;
734 path->flags = parm->ctrl.ipflags1;
735 }
736 local_bh_enable();
737 return rc;
738}
739
740/**
741 * iucv_path_connect
742 * @path: address of iucv path structure
743 * @handler: address of iucv handler structure
744 * @userid: 8-byte user identification
745 * @system: 8-byte target system identification
746 * @userdata: 16 bytes of data reflected to the communication partner
747 * @private: private data passed to interrupt handlers for this path
748 *
749 * This function establishes an IUCV path. Although the connect may complete
750 * successfully, you are not able to use the path until you receive an IUCV
751 * Connection Complete external interrupt.
752 *
753 * Returns the result of the CP IUCV call.
754 */
755int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
756 u8 userid[8], u8 system[8], u8 userdata[16],
757 void *private)
758{
759 union iucv_param *parm;
760 int rc;
761
762 preempt_disable();
763 if (iucv_tasklet_cpu != smp_processor_id())
764 spin_lock_bh(&iucv_table_lock);
765 parm = percpu_ptr(iucv_param, smp_processor_id());
766 memset(parm, 0, sizeof(union iucv_param));
767 parm->ctrl.ipmsglim = path->msglim;
768 parm->ctrl.ipflags1 = path->flags;
769 if (userid) {
770 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
771 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
772 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
773 }
774 if (system) {
775 memcpy(parm->ctrl.iptarget, system,
776 sizeof(parm->ctrl.iptarget));
777 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
778 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
779 }
780 if (userdata)
781 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
782
783 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
784 if (!rc) {
785 if (parm->ctrl.ippathid < iucv_max_pathid) {
786 path->pathid = parm->ctrl.ippathid;
787 path->msglim = parm->ctrl.ipmsglim;
788 path->flags = parm->ctrl.ipflags1;
789 path->handler = handler;
790 path->private = private;
791 list_add_tail(&path->list, &handler->paths);
792 iucv_path_table[path->pathid] = path;
793 } else {
794 iucv_sever_pathid(parm->ctrl.ippathid,
795 iucv_error_pathid);
796 rc = -EIO;
797 }
798 }
799 if (iucv_tasklet_cpu != smp_processor_id())
800 spin_unlock_bh(&iucv_table_lock);
801 preempt_enable();
802 return rc;
803}
804
805/**
806 * iucv_path_quiesce:
807 * @path: address of iucv path structure
808 * @userdata: 16 bytes of data reflected to the communication partner
809 *
810 * This function temporarily suspends incoming messages on an IUCV path.
811 * You can later reactivate the path by invoking the iucv_resume function.
812 *
813 * Returns the result from the CP IUCV call.
814 */
815int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
816{
817 union iucv_param *parm;
818 int rc;
819
820 local_bh_disable();
821 parm = percpu_ptr(iucv_param, smp_processor_id());
822 memset(parm, 0, sizeof(union iucv_param));
823 if (userdata)
824 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
825 parm->ctrl.ippathid = path->pathid;
826 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
827 local_bh_enable();
828 return rc;
829}
830
831/**
832 * iucv_path_resume:
833 * @path: address of iucv path structure
834 * @userdata: 16 bytes of data reflected to the communication partner
835 *
836 * This function resumes incoming messages on an IUCV path that has
837 * been stopped with iucv_path_quiesce.
838 *
839 * Returns the result from the CP IUCV call.
840 */
841int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
842{
843 union iucv_param *parm;
844 int rc;
845
846 local_bh_disable();
847 parm = percpu_ptr(iucv_param, smp_processor_id());
848 memset(parm, 0, sizeof(union iucv_param));
849 if (userdata)
850 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
851 parm->ctrl.ippathid = path->pathid;
852 rc = iucv_call_b2f0(IUCV_RESUME, parm);
853 local_bh_enable();
854 return rc;
855}
856
857/**
858 * iucv_path_sever
859 * @path: address of iucv path structure
860 * @userdata: 16 bytes of data reflected to the communication partner
861 *
862 * This function terminates an IUCV path.
863 *
864 * Returns the result from the CP IUCV call.
865 */
866int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
867{
868 int rc;
869
870
871 preempt_disable();
872 if (iucv_tasklet_cpu != smp_processor_id())
873 spin_lock_bh(&iucv_table_lock);
874 rc = iucv_sever_pathid(path->pathid, userdata);
875 if (!rc) {
876 iucv_path_table[path->pathid] = NULL;
877 list_del_init(&path->list);
878 iucv_cleanup_pathid(path->pathid);
879 }
880 if (iucv_tasklet_cpu != smp_processor_id())
881 spin_unlock_bh(&iucv_table_lock);
882 preempt_enable();
883 return rc;
884}
885
886/**
887 * iucv_message_purge
888 * @path: address of iucv path structure
889 * @msg: address of iucv msg structure
890 * @srccls: source class of message
891 *
892 * Cancels a message you have sent.
893 *
894 * Returns the result from the CP IUCV call.
895 */
896int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
897 u32 srccls)
898{
899 union iucv_param *parm;
900 int rc;
901
902 local_bh_disable();
903 parm = percpu_ptr(iucv_param, smp_processor_id());
904 memset(parm, 0, sizeof(union iucv_param));
905 parm->purge.ippathid = path->pathid;
906 parm->purge.ipmsgid = msg->id;
907 parm->purge.ipsrccls = srccls;
908 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
909 rc = iucv_call_b2f0(IUCV_PURGE, parm);
910 if (!rc) {
911 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
912 msg->tag = parm->purge.ipmsgtag;
913 }
914 local_bh_enable();
915 return rc;
916}
917
918/**
919 * iucv_message_receive
920 * @path: address of iucv path structure
921 * @msg: address of iucv msg structure
922 * @flags: how the message is received (IUCV_IPBUFLST)
923 * @buffer: address of data buffer or address of struct iucv_array
924 * @size: length of data buffer
925 * @residual:
926 *
927 * This function receives messages that are being sent to you over
928 * established paths. This function will deal with RMDATA messages
929 * embedded in struct iucv_message as well.
930 *
931 * Returns the result from the CP IUCV call.
932 */
933int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
934 u8 flags, void *buffer, size_t size, size_t *residual)
935{
936 union iucv_param *parm;
937 struct iucv_array *array;
938 u8 *rmmsg;
939 size_t copy;
940 int rc;
941
942 if (msg->flags & IUCV_IPRMDATA) {
943 /*
944 * Message is 8 bytes long and has been stored to the
945 * message descriptor itself.
946 */
947 rc = (size < 8) ? 5 : 0;
948 if (residual)
949 *residual = abs(size - 8);
950 rmmsg = msg->rmmsg;
951 if (flags & IUCV_IPBUFLST) {
952 /* Copy to struct iucv_array. */
953 size = (size < 8) ? size : 8;
954 for (array = buffer; size > 0; array++) {
955 copy = min_t(size_t, size, array->length);
956 memcpy((u8 *)(addr_t) array->address,
957 rmmsg, copy);
958 rmmsg += copy;
959 size -= copy;
960 }
961 } else {
962 /* Copy to direct buffer. */
963 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
964 }
965 return 0;
966 }
967
968 local_bh_disable();
969 parm = percpu_ptr(iucv_param, smp_processor_id());
970 memset(parm, 0, sizeof(union iucv_param));
971 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
972 parm->db.ipbfln1f = (u32) size;
973 parm->db.ipmsgid = msg->id;
974 parm->db.ippathid = path->pathid;
975 parm->db.iptrgcls = msg->class;
976 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
977 IUCV_IPFGMID | IUCV_IPTRGCLS);
978 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
979 if (!rc || rc == 5) {
980 msg->flags = parm->db.ipflags1;
981 if (residual)
982 *residual = parm->db.ipbfln1f;
983 }
984 local_bh_enable();
985 return rc;
986}
987
988/**
989 * iucv_message_reject
990 * @path: address of iucv path structure
991 * @msg: address of iucv msg structure
992 *
993 * The reject function refuses a specified message. Between the time you
994 * are notified of a message and the time that you complete the message,
995 * the message may be rejected.
996 *
997 * Returns the result from the CP IUCV call.
998 */
999int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1000{
1001 union iucv_param *parm;
1002 int rc;
1003
1004 local_bh_disable();
1005 parm = percpu_ptr(iucv_param, smp_processor_id());
1006 memset(parm, 0, sizeof(union iucv_param));
1007 parm->db.ippathid = path->pathid;
1008 parm->db.ipmsgid = msg->id;
1009 parm->db.iptrgcls = msg->class;
1010 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1011 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1012 local_bh_enable();
1013 return rc;
1014}
1015
1016/**
1017 * iucv_message_reply
1018 * @path: address of iucv path structure
1019 * @msg: address of iucv msg structure
1020 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1021 * @reply: address of reply data buffer or address of struct iucv_array
1022 * @size: length of reply data buffer
1023 *
1024 * This function responds to the two-way messages that you receive. You
1025 * must identify completely the message to which you wish to reply. ie,
1026 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1027 * the parameter list.
1028 *
1029 * Returns the result from the CP IUCV call.
1030 */
1031int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1032 u8 flags, void *reply, size_t size)
1033{
1034 union iucv_param *parm;
1035 int rc;
1036
1037 local_bh_disable();
1038 parm = percpu_ptr(iucv_param, smp_processor_id());
1039 memset(parm, 0, sizeof(union iucv_param));
1040 if (flags & IUCV_IPRMDATA) {
1041 parm->dpl.ippathid = path->pathid;
1042 parm->dpl.ipflags1 = flags;
1043 parm->dpl.ipmsgid = msg->id;
1044 parm->dpl.iptrgcls = msg->class;
1045 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1046 } else {
1047 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1048 parm->db.ipbfln1f = (u32) size;
1049 parm->db.ippathid = path->pathid;
1050 parm->db.ipflags1 = flags;
1051 parm->db.ipmsgid = msg->id;
1052 parm->db.iptrgcls = msg->class;
1053 }
1054 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1055 local_bh_enable();
1056 return rc;
1057}
1058
1059/**
1060 * iucv_message_send
1061 * @path: address of iucv path structure
1062 * @msg: address of iucv msg structure
1063 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1064 * @srccls: source class of message
1065 * @buffer: address of send buffer or address of struct iucv_array
1066 * @size: length of send buffer
1067 *
1068 * This function transmits data to another application. Data to be
1069 * transmitted is in a buffer and this is a one-way message and the
1070 * receiver will not reply to the message.
1071 *
1072 * Returns the result from the CP IUCV call.
1073 */
1074int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1075 u8 flags, u32 srccls, void *buffer, size_t size)
1076{
1077 union iucv_param *parm;
1078 int rc;
1079
1080 local_bh_disable();
1081 parm = percpu_ptr(iucv_param, smp_processor_id());
1082 memset(parm, 0, sizeof(union iucv_param));
1083 if (flags & IUCV_IPRMDATA) {
1084 /* Message of 8 bytes can be placed into the parameter list. */
1085 parm->dpl.ippathid = path->pathid;
1086 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1087 parm->dpl.iptrgcls = msg->class;
1088 parm->dpl.ipsrccls = srccls;
1089 parm->dpl.ipmsgtag = msg->tag;
1090 memcpy(parm->dpl.iprmmsg, buffer, 8);
1091 } else {
1092 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1093 parm->db.ipbfln1f = (u32) size;
1094 parm->db.ippathid = path->pathid;
1095 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1096 parm->db.iptrgcls = msg->class;
1097 parm->db.ipsrccls = srccls;
1098 parm->db.ipmsgtag = msg->tag;
1099 }
1100 rc = iucv_call_b2f0(IUCV_SEND, parm);
1101 if (!rc)
1102 msg->id = parm->db.ipmsgid;
1103 local_bh_enable();
1104 return rc;
1105}
1106
1107/**
1108 * iucv_message_send2way
1109 * @path: address of iucv path structure
1110 * @msg: address of iucv msg structure
1111 * @flags: how the message is sent and the reply is received
1112 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1113 * @srccls: source class of message
1114 * @buffer: address of send buffer or address of struct iucv_array
1115 * @size: length of send buffer
1116 * @ansbuf: address of answer buffer or address of struct iucv_array
1117 * @asize: size of reply buffer
1118 *
1119 * This function transmits data to another application. Data to be
1120 * transmitted is in a buffer. The receiver of the send is expected to
1121 * reply to the message and a buffer is provided into which IUCV moves
1122 * the reply to this message.
1123 *
1124 * Returns the result from the CP IUCV call.
1125 */
1126int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1127 u8 flags, u32 srccls, void *buffer, size_t size,
1128 void *answer, size_t asize, size_t *residual)
1129{
1130 union iucv_param *parm;
1131 int rc;
1132
1133 local_bh_disable();
1134 parm = percpu_ptr(iucv_param, smp_processor_id());
1135 memset(parm, 0, sizeof(union iucv_param));
1136 if (flags & IUCV_IPRMDATA) {
1137 parm->dpl.ippathid = path->pathid;
1138 parm->dpl.ipflags1 = path->flags; /* priority message */
1139 parm->dpl.iptrgcls = msg->class;
1140 parm->dpl.ipsrccls = srccls;
1141 parm->dpl.ipmsgtag = msg->tag;
1142 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1143 parm->dpl.ipbfln2f = (u32) asize;
1144 memcpy(parm->dpl.iprmmsg, buffer, 8);
1145 } else {
1146 parm->db.ippathid = path->pathid;
1147 parm->db.ipflags1 = path->flags; /* priority message */
1148 parm->db.iptrgcls = msg->class;
1149 parm->db.ipsrccls = srccls;
1150 parm->db.ipmsgtag = msg->tag;
1151 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1152 parm->db.ipbfln1f = (u32) size;
1153 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1154 parm->db.ipbfln2f = (u32) asize;
1155 }
1156 rc = iucv_call_b2f0(IUCV_SEND, parm);
1157 if (!rc)
1158 msg->id = parm->db.ipmsgid;
1159 local_bh_enable();
1160 return rc;
1161}
1162
1163/**
1164 * iucv_path_pending
1165 * @data: Pointer to external interrupt buffer
1166 *
1167 * Process connection pending work item. Called from tasklet while holding
1168 * iucv_table_lock.
1169 */
1170struct iucv_path_pending {
1171 u16 ippathid;
1172 u8 ipflags1;
1173 u8 iptype;
1174 u16 ipmsglim;
1175 u16 res1;
1176 u8 ipvmid[8];
1177 u8 ipuser[16];
1178 u32 res3;
1179 u8 ippollfg;
1180 u8 res4[3];
1181} __attribute__ ((packed));
1182
1183static void iucv_path_pending(struct iucv_irq_data *data)
1184{
1185 struct iucv_path_pending *ipp = (void *) data;
1186 struct iucv_handler *handler;
1187 struct iucv_path *path;
1188 char *error;
1189
1190 BUG_ON(iucv_path_table[ipp->ippathid]);
1191 /* New pathid, handler found. Create a new path struct. */
1192 error = iucv_error_no_memory;
1193 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1194 if (!path)
1195 goto out_sever;
1196 path->pathid = ipp->ippathid;
1197 iucv_path_table[path->pathid] = path;
1198 EBCASC(ipp->ipvmid, 8);
1199
1200 /* Call registered handler until one is found that wants the path. */
1201 list_for_each_entry(handler, &iucv_handler_list, list) {
1202 if (!handler->path_pending)
1203 continue;
1204 /*
1205 * Add path to handler to allow a call to iucv_path_sever
1206 * inside the path_pending function. If the handler returns
1207 * an error remove the path from the handler again.
1208 */
1209 list_add(&path->list, &handler->paths);
1210 path->handler = handler;
1211 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1212 return;
1213 list_del(&path->list);
1214 path->handler = NULL;
1215 }
1216 /* No handler wanted the path. */
1217 iucv_path_table[path->pathid] = NULL;
1218 iucv_path_free(path);
1219 error = iucv_error_no_listener;
1220out_sever:
1221 iucv_sever_pathid(ipp->ippathid, error);
1222}
1223
1224/**
1225 * iucv_path_complete
1226 * @data: Pointer to external interrupt buffer
1227 *
1228 * Process connection complete work item. Called from tasklet while holding
1229 * iucv_table_lock.
1230 */
1231struct iucv_path_complete {
1232 u16 ippathid;
1233 u8 ipflags1;
1234 u8 iptype;
1235 u16 ipmsglim;
1236 u16 res1;
1237 u8 res2[8];
1238 u8 ipuser[16];
1239 u32 res3;
1240 u8 ippollfg;
1241 u8 res4[3];
1242} __attribute__ ((packed));
1243
1244static void iucv_path_complete(struct iucv_irq_data *data)
1245{
1246 struct iucv_path_complete *ipc = (void *) data;
1247 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1248
1249 BUG_ON(!path || !path->handler);
1250 if (path->handler->path_complete)
1251 path->handler->path_complete(path, ipc->ipuser);
1252}
1253
1254/**
1255 * iucv_path_severed
1256 * @data: Pointer to external interrupt buffer
1257 *
1258 * Process connection severed work item. Called from tasklet while holding
1259 * iucv_table_lock.
1260 */
1261struct iucv_path_severed {
1262 u16 ippathid;
1263 u8 res1;
1264 u8 iptype;
1265 u32 res2;
1266 u8 res3[8];
1267 u8 ipuser[16];
1268 u32 res4;
1269 u8 ippollfg;
1270 u8 res5[3];
1271} __attribute__ ((packed));
1272
1273static void iucv_path_severed(struct iucv_irq_data *data)
1274{
1275 struct iucv_path_severed *ips = (void *) data;
1276 struct iucv_path *path = iucv_path_table[ips->ippathid];
1277
1278 BUG_ON(!path || !path->handler);
1279 if (path->handler->path_severed)
1280 path->handler->path_severed(path, ips->ipuser);
1281 else {
1282 iucv_sever_pathid(path->pathid, NULL);
1283 iucv_path_table[path->pathid] = NULL;
1284 list_del_init(&path->list);
1285 iucv_cleanup_pathid(path->pathid);
1286 iucv_path_free(path);
1287 }
1288}
1289
1290/**
1291 * iucv_path_quiesced
1292 * @data: Pointer to external interrupt buffer
1293 *
1294 * Process connection quiesced work item. Called from tasklet while holding
1295 * iucv_table_lock.
1296 */
1297struct iucv_path_quiesced {
1298 u16 ippathid;
1299 u8 res1;
1300 u8 iptype;
1301 u32 res2;
1302 u8 res3[8];
1303 u8 ipuser[16];
1304 u32 res4;
1305 u8 ippollfg;
1306 u8 res5[3];
1307} __attribute__ ((packed));
1308
1309static void iucv_path_quiesced(struct iucv_irq_data *data)
1310{
1311 struct iucv_path_quiesced *ipq = (void *) data;
1312 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1313
1314 BUG_ON(!path || !path->handler);
1315 if (path->handler->path_quiesced)
1316 path->handler->path_quiesced(path, ipq->ipuser);
1317}
1318
1319/**
1320 * iucv_path_resumed
1321 * @data: Pointer to external interrupt buffer
1322 *
1323 * Process connection resumed work item. Called from tasklet while holding
1324 * iucv_table_lock.
1325 */
1326struct iucv_path_resumed {
1327 u16 ippathid;
1328 u8 res1;
1329 u8 iptype;
1330 u32 res2;
1331 u8 res3[8];
1332 u8 ipuser[16];
1333 u32 res4;
1334 u8 ippollfg;
1335 u8 res5[3];
1336} __attribute__ ((packed));
1337
1338static void iucv_path_resumed(struct iucv_irq_data *data)
1339{
1340 struct iucv_path_resumed *ipr = (void *) data;
1341 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1342
1343 BUG_ON(!path || !path->handler);
1344 if (path->handler->path_resumed)
1345 path->handler->path_resumed(path, ipr->ipuser);
1346}
1347
1348/**
1349 * iucv_message_complete
1350 * @data: Pointer to external interrupt buffer
1351 *
1352 * Process message complete work item. Called from tasklet while holding
1353 * iucv_table_lock.
1354 */
1355struct iucv_message_complete {
1356 u16 ippathid;
1357 u8 ipflags1;
1358 u8 iptype;
1359 u32 ipmsgid;
1360 u32 ipaudit;
1361 u8 iprmmsg[8];
1362 u32 ipsrccls;
1363 u32 ipmsgtag;
1364 u32 res;
1365 u32 ipbfln2f;
1366 u8 ippollfg;
1367 u8 res2[3];
1368} __attribute__ ((packed));
1369
1370static void iucv_message_complete(struct iucv_irq_data *data)
1371{
1372 struct iucv_message_complete *imc = (void *) data;
1373 struct iucv_path *path = iucv_path_table[imc->ippathid];
1374 struct iucv_message msg;
1375
1376 BUG_ON(!path || !path->handler);
1377 if (path->handler->message_complete) {
1378 msg.flags = imc->ipflags1;
1379 msg.id = imc->ipmsgid;
1380 msg.audit = imc->ipaudit;
1381 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1382 msg.class = imc->ipsrccls;
1383 msg.tag = imc->ipmsgtag;
1384 msg.length = imc->ipbfln2f;
1385 path->handler->message_complete(path, &msg);
1386 }
1387}
1388
1389/**
1390 * iucv_message_pending
1391 * @data: Pointer to external interrupt buffer
1392 *
1393 * Process message pending work item. Called from tasklet while holding
1394 * iucv_table_lock.
1395 */
1396struct iucv_message_pending {
1397 u16 ippathid;
1398 u8 ipflags1;
1399 u8 iptype;
1400 u32 ipmsgid;
1401 u32 iptrgcls;
1402 union {
1403 u32 iprmmsg1_u32;
1404 u8 iprmmsg1[4];
1405 } ln1msg1;
1406 union {
1407 u32 ipbfln1f;
1408 u8 iprmmsg2[4];
1409 } ln1msg2;
1410 u32 res1[3];
1411 u32 ipbfln2f;
1412 u8 ippollfg;
1413 u8 res2[3];
1414} __attribute__ ((packed));
1415
1416static void iucv_message_pending(struct iucv_irq_data *data)
1417{
1418 struct iucv_message_pending *imp = (void *) data;
1419 struct iucv_path *path = iucv_path_table[imp->ippathid];
1420 struct iucv_message msg;
1421
1422 BUG_ON(!path || !path->handler);
1423 if (path->handler->message_pending) {
1424 msg.flags = imp->ipflags1;
1425 msg.id = imp->ipmsgid;
1426 msg.class = imp->iptrgcls;
1427 if (imp->ipflags1 & IUCV_IPRMDATA) {
1428 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1429 msg.length = 8;
1430 } else
1431 msg.length = imp->ln1msg2.ipbfln1f;
1432 msg.reply_size = imp->ipbfln2f;
1433 path->handler->message_pending(path, &msg);
1434 }
1435}
1436
1437/**
1438 * iucv_tasklet_handler:
1439 *
1440 * This tasklet loops over the queue of irq buffers created by
1441 * iucv_external_interrupt, calls the appropriate action handler
1442 * and then frees the buffer.
1443 */
1444static void iucv_tasklet_handler(unsigned long ignored)
1445{
1446 typedef void iucv_irq_fn(struct iucv_irq_data *);
1447 static iucv_irq_fn *irq_fn[] = {
1448 [0x01] = iucv_path_pending,
1449 [0x02] = iucv_path_complete,
1450 [0x03] = iucv_path_severed,
1451 [0x04] = iucv_path_quiesced,
1452 [0x05] = iucv_path_resumed,
1453 [0x06] = iucv_message_complete,
1454 [0x07] = iucv_message_complete,
1455 [0x08] = iucv_message_pending,
1456 [0x09] = iucv_message_pending,
1457 };
1458 struct iucv_work *p;
1459
1460 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1461 spin_lock(&iucv_table_lock);
1462 iucv_tasklet_cpu = smp_processor_id();
1463
1464 spin_lock_irq(&iucv_work_lock);
1465 while (!list_empty(&iucv_work_queue)) {
1466 p = list_entry(iucv_work_queue.next, struct iucv_work, list);
1467 list_del_init(&p->list);
1468 spin_unlock_irq(&iucv_work_lock);
1469 irq_fn[p->data.iptype](&p->data);
1470 kfree(p);
1471 spin_lock_irq(&iucv_work_lock);
1472 }
1473 spin_unlock_irq(&iucv_work_lock);
1474
1475 iucv_tasklet_cpu = -1;
1476 spin_unlock(&iucv_table_lock);
1477}
1478
1479/**
1480 * iucv_external_interrupt
1481 * @code: irq code
1482 *
1483 * Handles external interrupts coming in from CP.
1484 * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
1485 */
1486static void iucv_external_interrupt(u16 code)
1487{
1488 struct iucv_irq_data *p;
1489 struct iucv_work *work;
1490
1491 p = percpu_ptr(iucv_irq_data, smp_processor_id());
1492 if (p->ippathid >= iucv_max_pathid) {
1493 printk(KERN_WARNING "iucv_do_int: Got interrupt with "
1494 "pathid %d > max_connections (%ld)\n",
1495 p->ippathid, iucv_max_pathid - 1);
1496 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1497 return;
1498 }
1499 if (p->iptype < 0x01 || p->iptype > 0x09) {
1500 printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
1501 return;
1502 }
1503 work = kmalloc(sizeof(struct iucv_work), GFP_ATOMIC);
1504 if (!work) {
1505 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1506 return;
1507 }
1508 memcpy(&work->data, p, sizeof(work->data));
1509 spin_lock(&iucv_work_lock);
1510 list_add_tail(&work->list, &iucv_work_queue);
1511 spin_unlock(&iucv_work_lock);
1512 tasklet_schedule(&iucv_tasklet);
1513}
1514
1515/**
1516 * iucv_init
1517 *
1518 * Allocates and initializes various data structures.
1519 */
1520static int iucv_init(void)
1521{
1522 int rc;
1523
1524 if (!MACHINE_IS_VM) {
1525 rc = -EPROTONOSUPPORT;
1526 goto out;
1527 }
1528 rc = iucv_query_maxconn();
1529 if (rc)
1530 goto out;
1531 rc = register_external_interrupt (0x4000, iucv_external_interrupt);
1532 if (rc)
1533 goto out;
1534 rc = bus_register(&iucv_bus);
1535 if (rc)
1536 goto out_int;
1537 iucv_root = s390_root_dev_register("iucv");
1538 if (IS_ERR(iucv_root)) {
1539 rc = PTR_ERR(iucv_root);
1540 goto out_bus;
1541 }
1542 /* Note: GFP_DMA used used to get memory below 2G */
1543 iucv_irq_data = percpu_alloc(sizeof(struct iucv_irq_data),
1544 GFP_KERNEL|GFP_DMA);
1545 if (!iucv_irq_data) {
1546 rc = -ENOMEM;
1547 goto out_root;
1548 }
1549 /* Allocate parameter blocks. */
1550 iucv_param = percpu_alloc(sizeof(union iucv_param),
1551 GFP_KERNEL|GFP_DMA);
1552 if (!iucv_param) {
1553 rc = -ENOMEM;
1554 goto out_extint;
1555 }
1556 register_hotcpu_notifier(&iucv_cpu_notifier);
1557 ASCEBC(iucv_error_no_listener, 16);
1558 ASCEBC(iucv_error_no_memory, 16);
1559 ASCEBC(iucv_error_pathid, 16);
1560 iucv_available = 1;
1561 return 0;
1562
1563out_extint:
1564 percpu_free(iucv_irq_data);
1565out_root:
1566 s390_root_dev_unregister(iucv_root);
1567out_bus:
1568 bus_unregister(&iucv_bus);
1569out_int:
1570 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1571out:
1572 return rc;
1573}
1574
1575/**
1576 * iucv_exit
1577 *
1578 * Frees everything allocated from iucv_init.
1579 */
1580static void iucv_exit(void)
1581{
1582 struct iucv_work *p, *n;
1583
1584 spin_lock_irq(&iucv_work_lock);
1585 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1586 kfree(p);
1587 spin_unlock_irq(&iucv_work_lock);
1588 unregister_hotcpu_notifier(&iucv_cpu_notifier);
1589 percpu_free(iucv_param);
1590 percpu_free(iucv_irq_data);
1591 s390_root_dev_unregister(iucv_root);
1592 bus_unregister(&iucv_bus);
1593 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1594}
1595
1596subsys_initcall(iucv_init);
1597module_exit(iucv_exit);
1598
1599/**
1600 * Export all public stuff
1601 */
1602EXPORT_SYMBOL (iucv_bus);
1603EXPORT_SYMBOL (iucv_root);
1604EXPORT_SYMBOL (iucv_register);
1605EXPORT_SYMBOL (iucv_unregister);
1606EXPORT_SYMBOL (iucv_path_accept);
1607EXPORT_SYMBOL (iucv_path_connect);
1608EXPORT_SYMBOL (iucv_path_quiesce);
1609EXPORT_SYMBOL (iucv_path_sever);
1610EXPORT_SYMBOL (iucv_message_purge);
1611EXPORT_SYMBOL (iucv_message_receive);
1612EXPORT_SYMBOL (iucv_message_reject);
1613EXPORT_SYMBOL (iucv_message_reply);
1614EXPORT_SYMBOL (iucv_message_send);
1615EXPORT_SYMBOL (iucv_message_send2way);
1616
1617MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1618MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1619MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 05:03:22 -0500