Revert "cpumask: introduce new APIs"
[linux-2.6.git] / net / iucv / iucv.c
1 /*
2  * IUCV base infrastructure.
3  *
4  * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
5  * Author(s):
6  *    Original source:
7  *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
8  *      Xenia Tkatschow (xenia@us.ibm.com)
9  *    2Gb awareness and general cleanup:
10  *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
11  *    Rewritten for af_iucv:
12  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
13  *
14  * Documentation used:
15  *    The original source
16  *    CP Programming Service, IBM document # SC24-5760
17  *
18  * This program is free software; you can redistribute it and/or modify
19  * it under the terms of the GNU General Public License as published by
20  * the Free Software Foundation; either version 2, or (at your option)
21  * any later version.
22  *
23  * This program is distributed in the hope that it will be useful,
24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
26  * GNU General Public License for more details.
27  *
28  * You should have received a copy of the GNU General Public License
29  * along with this program; if not, write to the Free Software
30  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31  */
32
33 #include <linux/module.h>
34 #include <linux/moduleparam.h>
35 #include <linux/spinlock.h>
36 #include <linux/kernel.h>
37 #include <linux/slab.h>
38 #include <linux/init.h>
39 #include <linux/interrupt.h>
40 #include <linux/list.h>
41 #include <linux/errno.h>
42 #include <linux/err.h>
43 #include <linux/device.h>
44 #include <linux/cpu.h>
45 #include <net/iucv/iucv.h>
46 #include <asm/atomic.h>
47 #include <asm/ebcdic.h>
48 #include <asm/io.h>
49 #include <asm/s390_ext.h>
50 #include <asm/s390_rdev.h>
51 #include <asm/smp.h>
52
53 /*
54  * FLAGS:
55  * All flags are defined in the field IPFLAGS1 of each function
56  * and can be found in CP Programming Services.
57  * IPSRCCLS - Indicates you have specified a source class.
58  * IPTRGCLS - Indicates you have specified a target class.
59  * IPFGPID  - Indicates you have specified a pathid.
60  * IPFGMID  - Indicates you have specified a message ID.
61  * IPNORPY  - Indicates a one-way message. No reply expected.
62  * IPALL    - Indicates that all paths are affected.
63  */
64 #define IUCV_IPSRCCLS   0x01
65 #define IUCV_IPTRGCLS   0x01
66 #define IUCV_IPFGPID    0x02
67 #define IUCV_IPFGMID    0x04
68 #define IUCV_IPNORPY    0x10
69 #define IUCV_IPALL      0x80
70
71 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
72 {
73         return 0;
74 }
75
76 struct bus_type iucv_bus = {
77         .name = "iucv",
78         .match = iucv_bus_match,
79 };
80 EXPORT_SYMBOL(iucv_bus);
81
82 struct device *iucv_root;
83 EXPORT_SYMBOL(iucv_root);
84
85 static int iucv_available;
86
87 /* General IUCV interrupt structure */
88 struct iucv_irq_data {
89         u16 ippathid;
90         u8  ipflags1;
91         u8  iptype;
92         u32 res2[8];
93 };
94
95 struct iucv_irq_list {
96         struct list_head list;
97         struct iucv_irq_data data;
98 };
99
100 static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
101 static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
102 static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
103
104 /*
105  * Queue of interrupt buffers lock for delivery via the tasklet
106  * (fast but can't call smp_call_function).
107  */
108 static LIST_HEAD(iucv_task_queue);
109
110 /*
111  * The tasklet for fast delivery of iucv interrupts.
112  */
113 static void iucv_tasklet_fn(unsigned long);
114 static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
115
116 /*
117  * Queue of interrupt buffers for delivery via a work queue
118  * (slower but can call smp_call_function).
119  */
120 static LIST_HEAD(iucv_work_queue);
121
122 /*
123  * The work element to deliver path pending interrupts.
124  */
125 static void iucv_work_fn(struct work_struct *work);
126 static DECLARE_WORK(iucv_work, iucv_work_fn);
127
128 /*
129  * Spinlock protecting task and work queue.
130  */
131 static DEFINE_SPINLOCK(iucv_queue_lock);
132
133 enum iucv_command_codes {
134         IUCV_QUERY = 0,
135         IUCV_RETRIEVE_BUFFER = 2,
136         IUCV_SEND = 4,
137         IUCV_RECEIVE = 5,
138         IUCV_REPLY = 6,
139         IUCV_REJECT = 8,
140         IUCV_PURGE = 9,
141         IUCV_ACCEPT = 10,
142         IUCV_CONNECT = 11,
143         IUCV_DECLARE_BUFFER = 12,
144         IUCV_QUIESCE = 13,
145         IUCV_RESUME = 14,
146         IUCV_SEVER = 15,
147         IUCV_SETMASK = 16,
148 };
149
150 /*
151  * Error messages that are used with the iucv_sever function. They get
152  * converted to EBCDIC.
153  */
154 static char iucv_error_no_listener[16] = "NO LISTENER";
155 static char iucv_error_no_memory[16] = "NO MEMORY";
156 static char iucv_error_pathid[16] = "INVALID PATHID";
157
158 /*
159  * iucv_handler_list: List of registered handlers.
160  */
161 static LIST_HEAD(iucv_handler_list);
162
163 /*
164  * iucv_path_table: an array of iucv_path structures.
165  */
166 static struct iucv_path **iucv_path_table;
167 static unsigned long iucv_max_pathid;
168
169 /*
170  * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
171  */
172 static DEFINE_SPINLOCK(iucv_table_lock);
173
174 /*
175  * iucv_active_cpu: contains the number of the cpu executing the tasklet
176  * or the work handler. Needed for iucv_path_sever called from tasklet.
177  */
178 static int iucv_active_cpu = -1;
179
180 /*
181  * Mutex and wait queue for iucv_register/iucv_unregister.
182  */
183 static DEFINE_MUTEX(iucv_register_mutex);
184
185 /*
186  * Counter for number of non-smp capable handlers.
187  */
188 static int iucv_nonsmp_handler;
189
190 /*
191  * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
192  * iucv_path_quiesce and iucv_path_sever.
193  */
194 struct iucv_cmd_control {
195         u16 ippathid;
196         u8  ipflags1;
197         u8  iprcode;
198         u16 ipmsglim;
199         u16 res1;
200         u8  ipvmid[8];
201         u8  ipuser[16];
202         u8  iptarget[8];
203 } __attribute__ ((packed,aligned(8)));
204
205 /*
206  * Data in parameter list iucv structure. Used by iucv_message_send,
207  * iucv_message_send2way and iucv_message_reply.
208  */
209 struct iucv_cmd_dpl {
210         u16 ippathid;
211         u8  ipflags1;
212         u8  iprcode;
213         u32 ipmsgid;
214         u32 iptrgcls;
215         u8  iprmmsg[8];
216         u32 ipsrccls;
217         u32 ipmsgtag;
218         u32 ipbfadr2;
219         u32 ipbfln2f;
220         u32 res;
221 } __attribute__ ((packed,aligned(8)));
222
223 /*
224  * Data in buffer iucv structure. Used by iucv_message_receive,
225  * iucv_message_reject, iucv_message_send, iucv_message_send2way
226  * and iucv_declare_cpu.
227  */
228 struct iucv_cmd_db {
229         u16 ippathid;
230         u8  ipflags1;
231         u8  iprcode;
232         u32 ipmsgid;
233         u32 iptrgcls;
234         u32 ipbfadr1;
235         u32 ipbfln1f;
236         u32 ipsrccls;
237         u32 ipmsgtag;
238         u32 ipbfadr2;
239         u32 ipbfln2f;
240         u32 res;
241 } __attribute__ ((packed,aligned(8)));
242
243 /*
244  * Purge message iucv structure. Used by iucv_message_purge.
245  */
246 struct iucv_cmd_purge {
247         u16 ippathid;
248         u8  ipflags1;
249         u8  iprcode;
250         u32 ipmsgid;
251         u8  ipaudit[3];
252         u8  res1[5];
253         u32 res2;
254         u32 ipsrccls;
255         u32 ipmsgtag;
256         u32 res3[3];
257 } __attribute__ ((packed,aligned(8)));
258
259 /*
260  * Set mask iucv structure. Used by iucv_enable_cpu.
261  */
262 struct iucv_cmd_set_mask {
263         u8  ipmask;
264         u8  res1[2];
265         u8  iprcode;
266         u32 res2[9];
267 } __attribute__ ((packed,aligned(8)));
268
269 union iucv_param {
270         struct iucv_cmd_control ctrl;
271         struct iucv_cmd_dpl dpl;
272         struct iucv_cmd_db db;
273         struct iucv_cmd_purge purge;
274         struct iucv_cmd_set_mask set_mask;
275 };
276
277 /*
278  * Anchor for per-cpu IUCV command parameter block.
279  */
280 static union iucv_param *iucv_param[NR_CPUS];
281
282 /**
283  * iucv_call_b2f0
284  * @code: identifier of IUCV call to CP.
285  * @parm: pointer to a struct iucv_parm block
286  *
287  * Calls CP to execute IUCV commands.
288  *
289  * Returns the result of the CP IUCV call.
290  */
291 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
292 {
293         register unsigned long reg0 asm ("0");
294         register unsigned long reg1 asm ("1");
295         int ccode;
296
297         reg0 = command;
298         reg1 = virt_to_phys(parm);
299         asm volatile(
300                 "       .long 0xb2f01000\n"
301                 "       ipm     %0\n"
302                 "       srl     %0,28\n"
303                 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
304                 :  "m" (*parm) : "cc");
305         return (ccode == 1) ? parm->ctrl.iprcode : ccode;
306 }
307
308 /**
309  * iucv_query_maxconn
310  *
311  * Determines the maximum number of connections that may be established.
312  *
313  * Returns the maximum number of connections or -EPERM is IUCV is not
314  * available.
315  */
316 static int iucv_query_maxconn(void)
317 {
318         register unsigned long reg0 asm ("0");
319         register unsigned long reg1 asm ("1");
320         void *param;
321         int ccode;
322
323         param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
324         if (!param)
325                 return -ENOMEM;
326         reg0 = IUCV_QUERY;
327         reg1 = (unsigned long) param;
328         asm volatile (
329                 "       .long   0xb2f01000\n"
330                 "       ipm     %0\n"
331                 "       srl     %0,28\n"
332                 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
333         if (ccode == 0)
334                 iucv_max_pathid = reg0;
335         kfree(param);
336         return ccode ? -EPERM : 0;
337 }
338
339 /**
340  * iucv_allow_cpu
341  * @data: unused
342  *
343  * Allow iucv interrupts on this cpu.
344  */
345 static void iucv_allow_cpu(void *data)
346 {
347         int cpu = smp_processor_id();
348         union iucv_param *parm;
349
350         /*
351          * Enable all iucv interrupts.
352          * ipmask contains bits for the different interrupts
353          *      0x80 - Flag to allow nonpriority message pending interrupts
354          *      0x40 - Flag to allow priority message pending interrupts
355          *      0x20 - Flag to allow nonpriority message completion interrupts
356          *      0x10 - Flag to allow priority message completion interrupts
357          *      0x08 - Flag to allow IUCV control interrupts
358          */
359         parm = iucv_param[cpu];
360         memset(parm, 0, sizeof(union iucv_param));
361         parm->set_mask.ipmask = 0xf8;
362         iucv_call_b2f0(IUCV_SETMASK, parm);
363
364         /* Set indication that iucv interrupts are allowed for this cpu. */
365         cpu_set(cpu, iucv_irq_cpumask);
366 }
367
368 /**
369  * iucv_block_cpu
370  * @data: unused
371  *
372  * Block iucv interrupts on this cpu.
373  */
374 static void iucv_block_cpu(void *data)
375 {
376         int cpu = smp_processor_id();
377         union iucv_param *parm;
378
379         /* Disable all iucv interrupts. */
380         parm = iucv_param[cpu];
381         memset(parm, 0, sizeof(union iucv_param));
382         iucv_call_b2f0(IUCV_SETMASK, parm);
383
384         /* Clear indication that iucv interrupts are allowed for this cpu. */
385         cpu_clear(cpu, iucv_irq_cpumask);
386 }
387
388 /**
389  * iucv_declare_cpu
390  * @data: unused
391  *
392  * Declare a interrupt buffer on this cpu.
393  */
394 static void iucv_declare_cpu(void *data)
395 {
396         int cpu = smp_processor_id();
397         union iucv_param *parm;
398         int rc;
399
400         if (cpu_isset(cpu, iucv_buffer_cpumask))
401                 return;
402
403         /* Declare interrupt buffer. */
404         parm = iucv_param[cpu];
405         memset(parm, 0, sizeof(union iucv_param));
406         parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
407         rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
408         if (rc) {
409                 char *err = "Unknown";
410                 switch (rc) {
411                 case 0x03:
412                         err = "Directory error";
413                         break;
414                 case 0x0a:
415                         err = "Invalid length";
416                         break;
417                 case 0x13:
418                         err = "Buffer already exists";
419                         break;
420                 case 0x3e:
421                         err = "Buffer overlap";
422                         break;
423                 case 0x5c:
424                         err = "Paging or storage error";
425                         break;
426                 }
427                 printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
428                        "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
429                 return;
430         }
431
432         /* Set indication that an iucv buffer exists for this cpu. */
433         cpu_set(cpu, iucv_buffer_cpumask);
434
435         if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
436                 /* Enable iucv interrupts on this cpu. */
437                 iucv_allow_cpu(NULL);
438         else
439                 /* Disable iucv interrupts on this cpu. */
440                 iucv_block_cpu(NULL);
441 }
442
443 /**
444  * iucv_retrieve_cpu
445  * @data: unused
446  *
447  * Retrieve interrupt buffer on this cpu.
448  */
449 static void iucv_retrieve_cpu(void *data)
450 {
451         int cpu = smp_processor_id();
452         union iucv_param *parm;
453
454         if (!cpu_isset(cpu, iucv_buffer_cpumask))
455                 return;
456
457         /* Block iucv interrupts. */
458         iucv_block_cpu(NULL);
459
460         /* Retrieve interrupt buffer. */
461         parm = iucv_param[cpu];
462         iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
463
464         /* Clear indication that an iucv buffer exists for this cpu. */
465         cpu_clear(cpu, iucv_buffer_cpumask);
466 }
467
468 /**
469  * iucv_setmask_smp
470  *
471  * Allow iucv interrupts on all cpus.
472  */
473 static void iucv_setmask_mp(void)
474 {
475         int cpu;
476
477         preempt_disable();
478         for_each_online_cpu(cpu)
479                 /* Enable all cpus with a declared buffer. */
480                 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
481                     !cpu_isset(cpu, iucv_irq_cpumask))
482                         smp_call_function_single(cpu, iucv_allow_cpu,
483                                                  NULL, 0, 1);
484         preempt_enable();
485 }
486
487 /**
488  * iucv_setmask_up
489  *
490  * Allow iucv interrupts on a single cpu.
491  */
492 static void iucv_setmask_up(void)
493 {
494         cpumask_t cpumask;
495         int cpu;
496
497         /* Disable all cpu but the first in cpu_irq_cpumask. */
498         cpumask = iucv_irq_cpumask;
499         cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
500         for_each_cpu_mask_nr(cpu, cpumask)
501                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 0, 1);
502 }
503
504 /**
505  * iucv_enable
506  *
507  * This function makes iucv ready for use. It allocates the pathid
508  * table, declares an iucv interrupt buffer and enables the iucv
509  * interrupts. Called when the first user has registered an iucv
510  * handler.
511  */
512 static int iucv_enable(void)
513 {
514         size_t alloc_size;
515         int cpu, rc;
516
517         rc = -ENOMEM;
518         alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
519         iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
520         if (!iucv_path_table)
521                 goto out;
522         /* Declare per cpu buffers. */
523         rc = -EIO;
524         preempt_disable();
525         for_each_online_cpu(cpu)
526                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
527         preempt_enable();
528         if (cpus_empty(iucv_buffer_cpumask))
529                 /* No cpu could declare an iucv buffer. */
530                 goto out_path;
531         return 0;
532
533 out_path:
534         kfree(iucv_path_table);
535 out:
536         return rc;
537 }
538
539 /**
540  * iucv_disable
541  *
542  * This function shuts down iucv. It disables iucv interrupts, retrieves
543  * the iucv interrupt buffer and frees the pathid table. Called after the
544  * last user unregister its iucv handler.
545  */
546 static void iucv_disable(void)
547 {
548         on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
549         kfree(iucv_path_table);
550 }
551
552 static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
553                                      unsigned long action, void *hcpu)
554 {
555         cpumask_t cpumask;
556         long cpu = (long) hcpu;
557
558         switch (action) {
559         case CPU_UP_PREPARE:
560         case CPU_UP_PREPARE_FROZEN:
561                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
562                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
563                 if (!iucv_irq_data[cpu])
564                         return NOTIFY_BAD;
565                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
566                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
567                 if (!iucv_param[cpu])
568                         return NOTIFY_BAD;
569                 break;
570         case CPU_UP_CANCELED:
571         case CPU_UP_CANCELED_FROZEN:
572         case CPU_DEAD:
573         case CPU_DEAD_FROZEN:
574                 kfree(iucv_param[cpu]);
575                 iucv_param[cpu] = NULL;
576                 kfree(iucv_irq_data[cpu]);
577                 iucv_irq_data[cpu] = NULL;
578                 break;
579         case CPU_ONLINE:
580         case CPU_ONLINE_FROZEN:
581         case CPU_DOWN_FAILED:
582         case CPU_DOWN_FAILED_FROZEN:
583                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
584                 break;
585         case CPU_DOWN_PREPARE:
586         case CPU_DOWN_PREPARE_FROZEN:
587                 cpumask = iucv_buffer_cpumask;
588                 cpu_clear(cpu, cpumask);
589                 if (cpus_empty(cpumask))
590                         /* Can't offline last IUCV enabled cpu. */
591                         return NOTIFY_BAD;
592                 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 0, 1);
593                 if (cpus_empty(iucv_irq_cpumask))
594                         smp_call_function_single(first_cpu(iucv_buffer_cpumask),
595                                                  iucv_allow_cpu, NULL, 0, 1);
596                 break;
597         }
598         return NOTIFY_OK;
599 }
600
601 static struct notifier_block __cpuinitdata iucv_cpu_notifier = {
602         .notifier_call = iucv_cpu_notify,
603 };
604
605 /**
606  * iucv_sever_pathid
607  * @pathid: path identification number.
608  * @userdata: 16-bytes of user data.
609  *
610  * Sever an iucv path to free up the pathid. Used internally.
611  */
612 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
613 {
614         union iucv_param *parm;
615
616         parm = iucv_param[smp_processor_id()];
617         memset(parm, 0, sizeof(union iucv_param));
618         if (userdata)
619                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
620         parm->ctrl.ippathid = pathid;
621         return iucv_call_b2f0(IUCV_SEVER, parm);
622 }
623
624 /**
625  * __iucv_cleanup_queue
626  * @dummy: unused dummy argument
627  *
628  * Nop function called via smp_call_function to force work items from
629  * pending external iucv interrupts to the work queue.
630  */
631 static void __iucv_cleanup_queue(void *dummy)
632 {
633 }
634
635 /**
636  * iucv_cleanup_queue
637  *
638  * Function called after a path has been severed to find all remaining
639  * work items for the now stale pathid. The caller needs to hold the
640  * iucv_table_lock.
641  */
642 static void iucv_cleanup_queue(void)
643 {
644         struct iucv_irq_list *p, *n;
645
646         /*
647          * When a path is severed, the pathid can be reused immediatly
648          * on a iucv connect or a connection pending interrupt. Remove
649          * all entries from the task queue that refer to a stale pathid
650          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
651          * or deliver the connection pending interrupt. To get all the
652          * pending interrupts force them to the work queue by calling
653          * an empty function on all cpus.
654          */
655         smp_call_function(__iucv_cleanup_queue, NULL, 0, 1);
656         spin_lock_irq(&iucv_queue_lock);
657         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
658                 /* Remove stale work items from the task queue. */
659                 if (iucv_path_table[p->data.ippathid] == NULL) {
660                         list_del(&p->list);
661                         kfree(p);
662                 }
663         }
664         spin_unlock_irq(&iucv_queue_lock);
665 }
666
667 /**
668  * iucv_register:
669  * @handler: address of iucv handler structure
670  * @smp: != 0 indicates that the handler can deal with out of order messages
671  *
672  * Registers a driver with IUCV.
673  *
674  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
675  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
676  */
677 int iucv_register(struct iucv_handler *handler, int smp)
678 {
679         int rc;
680
681         if (!iucv_available)
682                 return -ENOSYS;
683         mutex_lock(&iucv_register_mutex);
684         if (!smp)
685                 iucv_nonsmp_handler++;
686         if (list_empty(&iucv_handler_list)) {
687                 rc = iucv_enable();
688                 if (rc)
689                         goto out_mutex;
690         } else if (!smp && iucv_nonsmp_handler == 1)
691                 iucv_setmask_up();
692         INIT_LIST_HEAD(&handler->paths);
693
694         spin_lock_bh(&iucv_table_lock);
695         list_add_tail(&handler->list, &iucv_handler_list);
696         spin_unlock_bh(&iucv_table_lock);
697         rc = 0;
698 out_mutex:
699         mutex_unlock(&iucv_register_mutex);
700         return rc;
701 }
702 EXPORT_SYMBOL(iucv_register);
703
704 /**
705  * iucv_unregister
706  * @handler:  address of iucv handler structure
707  * @smp: != 0 indicates that the handler can deal with out of order messages
708  *
709  * Unregister driver from IUCV.
710  */
711 void iucv_unregister(struct iucv_handler *handler, int smp)
712 {
713         struct iucv_path *p, *n;
714
715         mutex_lock(&iucv_register_mutex);
716         spin_lock_bh(&iucv_table_lock);
717         /* Remove handler from the iucv_handler_list. */
718         list_del_init(&handler->list);
719         /* Sever all pathids still refering to the handler. */
720         list_for_each_entry_safe(p, n, &handler->paths, list) {
721                 iucv_sever_pathid(p->pathid, NULL);
722                 iucv_path_table[p->pathid] = NULL;
723                 list_del(&p->list);
724                 iucv_path_free(p);
725         }
726         spin_unlock_bh(&iucv_table_lock);
727         if (!smp)
728                 iucv_nonsmp_handler--;
729         if (list_empty(&iucv_handler_list))
730                 iucv_disable();
731         else if (!smp && iucv_nonsmp_handler == 0)
732                 iucv_setmask_mp();
733         mutex_unlock(&iucv_register_mutex);
734 }
735 EXPORT_SYMBOL(iucv_unregister);
736
737 /**
738  * iucv_path_accept
739  * @path: address of iucv path structure
740  * @handler: address of iucv handler structure
741  * @userdata: 16 bytes of data reflected to the communication partner
742  * @private: private data passed to interrupt handlers for this path
743  *
744  * This function is issued after the user received a connection pending
745  * external interrupt and now wishes to complete the IUCV communication path.
746  *
747  * Returns the result of the CP IUCV call.
748  */
749 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
750                      u8 userdata[16], void *private)
751 {
752         union iucv_param *parm;
753         int rc;
754
755         local_bh_disable();
756         /* Prepare parameter block. */
757         parm = iucv_param[smp_processor_id()];
758         memset(parm, 0, sizeof(union iucv_param));
759         parm->ctrl.ippathid = path->pathid;
760         parm->ctrl.ipmsglim = path->msglim;
761         if (userdata)
762                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
763         parm->ctrl.ipflags1 = path->flags;
764
765         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
766         if (!rc) {
767                 path->private = private;
768                 path->msglim = parm->ctrl.ipmsglim;
769                 path->flags = parm->ctrl.ipflags1;
770         }
771         local_bh_enable();
772         return rc;
773 }
774 EXPORT_SYMBOL(iucv_path_accept);
775
776 /**
777  * iucv_path_connect
778  * @path: address of iucv path structure
779  * @handler: address of iucv handler structure
780  * @userid: 8-byte user identification
781  * @system: 8-byte target system identification
782  * @userdata: 16 bytes of data reflected to the communication partner
783  * @private: private data passed to interrupt handlers for this path
784  *
785  * This function establishes an IUCV path. Although the connect may complete
786  * successfully, you are not able to use the path until you receive an IUCV
787  * Connection Complete external interrupt.
788  *
789  * Returns the result of the CP IUCV call.
790  */
791 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
792                       u8 userid[8], u8 system[8], u8 userdata[16],
793                       void *private)
794 {
795         union iucv_param *parm;
796         int rc;
797
798         spin_lock_bh(&iucv_table_lock);
799         iucv_cleanup_queue();
800         parm = iucv_param[smp_processor_id()];
801         memset(parm, 0, sizeof(union iucv_param));
802         parm->ctrl.ipmsglim = path->msglim;
803         parm->ctrl.ipflags1 = path->flags;
804         if (userid) {
805                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
806                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
807                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
808         }
809         if (system) {
810                 memcpy(parm->ctrl.iptarget, system,
811                        sizeof(parm->ctrl.iptarget));
812                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
813                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
814         }
815         if (userdata)
816                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
817
818         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
819         if (!rc) {
820                 if (parm->ctrl.ippathid < iucv_max_pathid) {
821                         path->pathid = parm->ctrl.ippathid;
822                         path->msglim = parm->ctrl.ipmsglim;
823                         path->flags = parm->ctrl.ipflags1;
824                         path->handler = handler;
825                         path->private = private;
826                         list_add_tail(&path->list, &handler->paths);
827                         iucv_path_table[path->pathid] = path;
828                 } else {
829                         iucv_sever_pathid(parm->ctrl.ippathid,
830                                           iucv_error_pathid);
831                         rc = -EIO;
832                 }
833         }
834         spin_unlock_bh(&iucv_table_lock);
835         return rc;
836 }
837 EXPORT_SYMBOL(iucv_path_connect);
838
839 /**
840  * iucv_path_quiesce:
841  * @path: address of iucv path structure
842  * @userdata: 16 bytes of data reflected to the communication partner
843  *
844  * This function temporarily suspends incoming messages on an IUCV path.
845  * You can later reactivate the path by invoking the iucv_resume function.
846  *
847  * Returns the result from the CP IUCV call.
848  */
849 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
850 {
851         union iucv_param *parm;
852         int rc;
853
854         local_bh_disable();
855         parm = iucv_param[smp_processor_id()];
856         memset(parm, 0, sizeof(union iucv_param));
857         if (userdata)
858                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
859         parm->ctrl.ippathid = path->pathid;
860         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
861         local_bh_enable();
862         return rc;
863 }
864 EXPORT_SYMBOL(iucv_path_quiesce);
865
866 /**
867  * iucv_path_resume:
868  * @path: address of iucv path structure
869  * @userdata: 16 bytes of data reflected to the communication partner
870  *
871  * This function resumes incoming messages on an IUCV path that has
872  * been stopped with iucv_path_quiesce.
873  *
874  * Returns the result from the CP IUCV call.
875  */
876 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
877 {
878         union iucv_param *parm;
879         int rc;
880
881         local_bh_disable();
882         parm = iucv_param[smp_processor_id()];
883         memset(parm, 0, sizeof(union iucv_param));
884         if (userdata)
885                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
886         parm->ctrl.ippathid = path->pathid;
887         rc = iucv_call_b2f0(IUCV_RESUME, parm);
888         local_bh_enable();
889         return rc;
890 }
891
892 /**
893  * iucv_path_sever
894  * @path: address of iucv path structure
895  * @userdata: 16 bytes of data reflected to the communication partner
896  *
897  * This function terminates an IUCV path.
898  *
899  * Returns the result from the CP IUCV call.
900  */
901 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
902 {
903         int rc;
904
905         preempt_disable();
906         if (iucv_active_cpu != smp_processor_id())
907                 spin_lock_bh(&iucv_table_lock);
908         rc = iucv_sever_pathid(path->pathid, userdata);
909         if (!rc) {
910                 iucv_path_table[path->pathid] = NULL;
911                 list_del_init(&path->list);
912         }
913         if (iucv_active_cpu != smp_processor_id())
914                 spin_unlock_bh(&iucv_table_lock);
915         preempt_enable();
916         return rc;
917 }
918 EXPORT_SYMBOL(iucv_path_sever);
919
920 /**
921  * iucv_message_purge
922  * @path: address of iucv path structure
923  * @msg: address of iucv msg structure
924  * @srccls: source class of message
925  *
926  * Cancels a message you have sent.
927  *
928  * Returns the result from the CP IUCV call.
929  */
930 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
931                        u32 srccls)
932 {
933         union iucv_param *parm;
934         int rc;
935
936         local_bh_disable();
937         parm = iucv_param[smp_processor_id()];
938         memset(parm, 0, sizeof(union iucv_param));
939         parm->purge.ippathid = path->pathid;
940         parm->purge.ipmsgid = msg->id;
941         parm->purge.ipsrccls = srccls;
942         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
943         rc = iucv_call_b2f0(IUCV_PURGE, parm);
944         if (!rc) {
945                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
946                 msg->tag = parm->purge.ipmsgtag;
947         }
948         local_bh_enable();
949         return rc;
950 }
951 EXPORT_SYMBOL(iucv_message_purge);
952
953 /**
954  * iucv_message_receive
955  * @path: address of iucv path structure
956  * @msg: address of iucv msg structure
957  * @flags: how the message is received (IUCV_IPBUFLST)
958  * @buffer: address of data buffer or address of struct iucv_array
959  * @size: length of data buffer
960  * @residual:
961  *
962  * This function receives messages that are being sent to you over
963  * established paths. This function will deal with RMDATA messages
964  * embedded in struct iucv_message as well.
965  *
966  * Returns the result from the CP IUCV call.
967  */
968 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
969                          u8 flags, void *buffer, size_t size, size_t *residual)
970 {
971         union iucv_param *parm;
972         struct iucv_array *array;
973         u8 *rmmsg;
974         size_t copy;
975         int rc;
976
977         if (msg->flags & IUCV_IPRMDATA) {
978                 /*
979                  * Message is 8 bytes long and has been stored to the
980                  * message descriptor itself.
981                  */
982                 rc = (size < 8) ? 5 : 0;
983                 if (residual)
984                         *residual = abs(size - 8);
985                 rmmsg = msg->rmmsg;
986                 if (flags & IUCV_IPBUFLST) {
987                         /* Copy to struct iucv_array. */
988                         size = (size < 8) ? size : 8;
989                         for (array = buffer; size > 0; array++) {
990                                 copy = min_t(size_t, size, array->length);
991                                 memcpy((u8 *)(addr_t) array->address,
992                                        rmmsg, copy);
993                                 rmmsg += copy;
994                                 size -= copy;
995                         }
996                 } else {
997                         /* Copy to direct buffer. */
998                         memcpy(buffer, rmmsg, min_t(size_t, size, 8));
999                 }
1000                 return 0;
1001         }
1002
1003         local_bh_disable();
1004         parm = iucv_param[smp_processor_id()];
1005         memset(parm, 0, sizeof(union iucv_param));
1006         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1007         parm->db.ipbfln1f = (u32) size;
1008         parm->db.ipmsgid = msg->id;
1009         parm->db.ippathid = path->pathid;
1010         parm->db.iptrgcls = msg->class;
1011         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1012                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1013         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1014         if (!rc || rc == 5) {
1015                 msg->flags = parm->db.ipflags1;
1016                 if (residual)
1017                         *residual = parm->db.ipbfln1f;
1018         }
1019         local_bh_enable();
1020         return rc;
1021 }
1022 EXPORT_SYMBOL(iucv_message_receive);
1023
1024 /**
1025  * iucv_message_reject
1026  * @path: address of iucv path structure
1027  * @msg: address of iucv msg structure
1028  *
1029  * The reject function refuses a specified message. Between the time you
1030  * are notified of a message and the time that you complete the message,
1031  * the message may be rejected.
1032  *
1033  * Returns the result from the CP IUCV call.
1034  */
1035 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1036 {
1037         union iucv_param *parm;
1038         int rc;
1039
1040         local_bh_disable();
1041         parm = iucv_param[smp_processor_id()];
1042         memset(parm, 0, sizeof(union iucv_param));
1043         parm->db.ippathid = path->pathid;
1044         parm->db.ipmsgid = msg->id;
1045         parm->db.iptrgcls = msg->class;
1046         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1047         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1048         local_bh_enable();
1049         return rc;
1050 }
1051 EXPORT_SYMBOL(iucv_message_reject);
1052
1053 /**
1054  * iucv_message_reply
1055  * @path: address of iucv path structure
1056  * @msg: address of iucv msg structure
1057  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1058  * @reply: address of reply data buffer or address of struct iucv_array
1059  * @size: length of reply data buffer
1060  *
1061  * This function responds to the two-way messages that you receive. You
1062  * must identify completely the message to which you wish to reply. ie,
1063  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1064  * the parameter list.
1065  *
1066  * Returns the result from the CP IUCV call.
1067  */
1068 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1069                        u8 flags, void *reply, size_t size)
1070 {
1071         union iucv_param *parm;
1072         int rc;
1073
1074         local_bh_disable();
1075         parm = iucv_param[smp_processor_id()];
1076         memset(parm, 0, sizeof(union iucv_param));
1077         if (flags & IUCV_IPRMDATA) {
1078                 parm->dpl.ippathid = path->pathid;
1079                 parm->dpl.ipflags1 = flags;
1080                 parm->dpl.ipmsgid = msg->id;
1081                 parm->dpl.iptrgcls = msg->class;
1082                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1083         } else {
1084                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1085                 parm->db.ipbfln1f = (u32) size;
1086                 parm->db.ippathid = path->pathid;
1087                 parm->db.ipflags1 = flags;
1088                 parm->db.ipmsgid = msg->id;
1089                 parm->db.iptrgcls = msg->class;
1090         }
1091         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1092         local_bh_enable();
1093         return rc;
1094 }
1095 EXPORT_SYMBOL(iucv_message_reply);
1096
1097 /**
1098  * iucv_message_send
1099  * @path: address of iucv path structure
1100  * @msg: address of iucv msg structure
1101  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1102  * @srccls: source class of message
1103  * @buffer: address of send buffer or address of struct iucv_array
1104  * @size: length of send buffer
1105  *
1106  * This function transmits data to another application. Data to be
1107  * transmitted is in a buffer and this is a one-way message and the
1108  * receiver will not reply to the message.
1109  *
1110  * Returns the result from the CP IUCV call.
1111  */
1112 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1113                       u8 flags, u32 srccls, void *buffer, size_t size)
1114 {
1115         union iucv_param *parm;
1116         int rc;
1117
1118         local_bh_disable();
1119         parm = iucv_param[smp_processor_id()];
1120         memset(parm, 0, sizeof(union iucv_param));
1121         if (flags & IUCV_IPRMDATA) {
1122                 /* Message of 8 bytes can be placed into the parameter list. */
1123                 parm->dpl.ippathid = path->pathid;
1124                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1125                 parm->dpl.iptrgcls = msg->class;
1126                 parm->dpl.ipsrccls = srccls;
1127                 parm->dpl.ipmsgtag = msg->tag;
1128                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1129         } else {
1130                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1131                 parm->db.ipbfln1f = (u32) size;
1132                 parm->db.ippathid = path->pathid;
1133                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1134                 parm->db.iptrgcls = msg->class;
1135                 parm->db.ipsrccls = srccls;
1136                 parm->db.ipmsgtag = msg->tag;
1137         }
1138         rc = iucv_call_b2f0(IUCV_SEND, parm);
1139         if (!rc)
1140                 msg->id = parm->db.ipmsgid;
1141         local_bh_enable();
1142         return rc;
1143 }
1144 EXPORT_SYMBOL(iucv_message_send);
1145
1146 /**
1147  * iucv_message_send2way
1148  * @path: address of iucv path structure
1149  * @msg: address of iucv msg structure
1150  * @flags: how the message is sent and the reply is received
1151  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1152  * @srccls: source class of message
1153  * @buffer: address of send buffer or address of struct iucv_array
1154  * @size: length of send buffer
1155  * @ansbuf: address of answer buffer or address of struct iucv_array
1156  * @asize: size of reply buffer
1157  *
1158  * This function transmits data to another application. Data to be
1159  * transmitted is in a buffer. The receiver of the send is expected to
1160  * reply to the message and a buffer is provided into which IUCV moves
1161  * the reply to this message.
1162  *
1163  * Returns the result from the CP IUCV call.
1164  */
1165 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1166                           u8 flags, u32 srccls, void *buffer, size_t size,
1167                           void *answer, size_t asize, size_t *residual)
1168 {
1169         union iucv_param *parm;
1170         int rc;
1171
1172         local_bh_disable();
1173         parm = iucv_param[smp_processor_id()];
1174         memset(parm, 0, sizeof(union iucv_param));
1175         if (flags & IUCV_IPRMDATA) {
1176                 parm->dpl.ippathid = path->pathid;
1177                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1178                 parm->dpl.iptrgcls = msg->class;
1179                 parm->dpl.ipsrccls = srccls;
1180                 parm->dpl.ipmsgtag = msg->tag;
1181                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1182                 parm->dpl.ipbfln2f = (u32) asize;
1183                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1184         } else {
1185                 parm->db.ippathid = path->pathid;
1186                 parm->db.ipflags1 = path->flags;        /* priority message */
1187                 parm->db.iptrgcls = msg->class;
1188                 parm->db.ipsrccls = srccls;
1189                 parm->db.ipmsgtag = msg->tag;
1190                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1191                 parm->db.ipbfln1f = (u32) size;
1192                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1193                 parm->db.ipbfln2f = (u32) asize;
1194         }
1195         rc = iucv_call_b2f0(IUCV_SEND, parm);
1196         if (!rc)
1197                 msg->id = parm->db.ipmsgid;
1198         local_bh_enable();
1199         return rc;
1200 }
1201 EXPORT_SYMBOL(iucv_message_send2way);
1202
1203 /**
1204  * iucv_path_pending
1205  * @data: Pointer to external interrupt buffer
1206  *
1207  * Process connection pending work item. Called from tasklet while holding
1208  * iucv_table_lock.
1209  */
1210 struct iucv_path_pending {
1211         u16 ippathid;
1212         u8  ipflags1;
1213         u8  iptype;
1214         u16 ipmsglim;
1215         u16 res1;
1216         u8  ipvmid[8];
1217         u8  ipuser[16];
1218         u32 res3;
1219         u8  ippollfg;
1220         u8  res4[3];
1221 } __attribute__ ((packed));
1222
1223 static void iucv_path_pending(struct iucv_irq_data *data)
1224 {
1225         struct iucv_path_pending *ipp = (void *) data;
1226         struct iucv_handler *handler;
1227         struct iucv_path *path;
1228         char *error;
1229
1230         BUG_ON(iucv_path_table[ipp->ippathid]);
1231         /* New pathid, handler found. Create a new path struct. */
1232         error = iucv_error_no_memory;
1233         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1234         if (!path)
1235                 goto out_sever;
1236         path->pathid = ipp->ippathid;
1237         iucv_path_table[path->pathid] = path;
1238         EBCASC(ipp->ipvmid, 8);
1239
1240         /* Call registered handler until one is found that wants the path. */
1241         list_for_each_entry(handler, &iucv_handler_list, list) {
1242                 if (!handler->path_pending)
1243                         continue;
1244                 /*
1245                  * Add path to handler to allow a call to iucv_path_sever
1246                  * inside the path_pending function. If the handler returns
1247                  * an error remove the path from the handler again.
1248                  */
1249                 list_add(&path->list, &handler->paths);
1250                 path->handler = handler;
1251                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1252                         return;
1253                 list_del(&path->list);
1254                 path->handler = NULL;
1255         }
1256         /* No handler wanted the path. */
1257         iucv_path_table[path->pathid] = NULL;
1258         iucv_path_free(path);
1259         error = iucv_error_no_listener;
1260 out_sever:
1261         iucv_sever_pathid(ipp->ippathid, error);
1262 }
1263
1264 /**
1265  * iucv_path_complete
1266  * @data: Pointer to external interrupt buffer
1267  *
1268  * Process connection complete work item. Called from tasklet while holding
1269  * iucv_table_lock.
1270  */
1271 struct iucv_path_complete {
1272         u16 ippathid;
1273         u8  ipflags1;
1274         u8  iptype;
1275         u16 ipmsglim;
1276         u16 res1;
1277         u8  res2[8];
1278         u8  ipuser[16];
1279         u32 res3;
1280         u8  ippollfg;
1281         u8  res4[3];
1282 } __attribute__ ((packed));
1283
1284 static void iucv_path_complete(struct iucv_irq_data *data)
1285 {
1286         struct iucv_path_complete *ipc = (void *) data;
1287         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1288
1289         if (path && path->handler && path->handler->path_complete)
1290                 path->handler->path_complete(path, ipc->ipuser);
1291 }
1292
1293 /**
1294  * iucv_path_severed
1295  * @data: Pointer to external interrupt buffer
1296  *
1297  * Process connection severed work item. Called from tasklet while holding
1298  * iucv_table_lock.
1299  */
1300 struct iucv_path_severed {
1301         u16 ippathid;
1302         u8  res1;
1303         u8  iptype;
1304         u32 res2;
1305         u8  res3[8];
1306         u8  ipuser[16];
1307         u32 res4;
1308         u8  ippollfg;
1309         u8  res5[3];
1310 } __attribute__ ((packed));
1311
1312 static void iucv_path_severed(struct iucv_irq_data *data)
1313 {
1314         struct iucv_path_severed *ips = (void *) data;
1315         struct iucv_path *path = iucv_path_table[ips->ippathid];
1316
1317         if (!path || !path->handler)    /* Already severed */
1318                 return;
1319         if (path->handler->path_severed)
1320                 path->handler->path_severed(path, ips->ipuser);
1321         else {
1322                 iucv_sever_pathid(path->pathid, NULL);
1323                 iucv_path_table[path->pathid] = NULL;
1324                 list_del_init(&path->list);
1325                 iucv_path_free(path);
1326         }
1327 }
1328
1329 /**
1330  * iucv_path_quiesced
1331  * @data: Pointer to external interrupt buffer
1332  *
1333  * Process connection quiesced work item. Called from tasklet while holding
1334  * iucv_table_lock.
1335  */
1336 struct iucv_path_quiesced {
1337         u16 ippathid;
1338         u8  res1;
1339         u8  iptype;
1340         u32 res2;
1341         u8  res3[8];
1342         u8  ipuser[16];
1343         u32 res4;
1344         u8  ippollfg;
1345         u8  res5[3];
1346 } __attribute__ ((packed));
1347
1348 static void iucv_path_quiesced(struct iucv_irq_data *data)
1349 {
1350         struct iucv_path_quiesced *ipq = (void *) data;
1351         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1352
1353         if (path && path->handler && path->handler->path_quiesced)
1354                 path->handler->path_quiesced(path, ipq->ipuser);
1355 }
1356
1357 /**
1358  * iucv_path_resumed
1359  * @data: Pointer to external interrupt buffer
1360  *
1361  * Process connection resumed work item. Called from tasklet while holding
1362  * iucv_table_lock.
1363  */
1364 struct iucv_path_resumed {
1365         u16 ippathid;
1366         u8  res1;
1367         u8  iptype;
1368         u32 res2;
1369         u8  res3[8];
1370         u8  ipuser[16];
1371         u32 res4;
1372         u8  ippollfg;
1373         u8  res5[3];
1374 } __attribute__ ((packed));
1375
1376 static void iucv_path_resumed(struct iucv_irq_data *data)
1377 {
1378         struct iucv_path_resumed *ipr = (void *) data;
1379         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1380
1381         if (path && path->handler && path->handler->path_resumed)
1382                 path->handler->path_resumed(path, ipr->ipuser);
1383 }
1384
1385 /**
1386  * iucv_message_complete
1387  * @data: Pointer to external interrupt buffer
1388  *
1389  * Process message complete work item. Called from tasklet while holding
1390  * iucv_table_lock.
1391  */
1392 struct iucv_message_complete {
1393         u16 ippathid;
1394         u8  ipflags1;
1395         u8  iptype;
1396         u32 ipmsgid;
1397         u32 ipaudit;
1398         u8  iprmmsg[8];
1399         u32 ipsrccls;
1400         u32 ipmsgtag;
1401         u32 res;
1402         u32 ipbfln2f;
1403         u8  ippollfg;
1404         u8  res2[3];
1405 } __attribute__ ((packed));
1406
1407 static void iucv_message_complete(struct iucv_irq_data *data)
1408 {
1409         struct iucv_message_complete *imc = (void *) data;
1410         struct iucv_path *path = iucv_path_table[imc->ippathid];
1411         struct iucv_message msg;
1412
1413         if (path && path->handler && path->handler->message_complete) {
1414                 msg.flags = imc->ipflags1;
1415                 msg.id = imc->ipmsgid;
1416                 msg.audit = imc->ipaudit;
1417                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1418                 msg.class = imc->ipsrccls;
1419                 msg.tag = imc->ipmsgtag;
1420                 msg.length = imc->ipbfln2f;
1421                 path->handler->message_complete(path, &msg);
1422         }
1423 }
1424
1425 /**
1426  * iucv_message_pending
1427  * @data: Pointer to external interrupt buffer
1428  *
1429  * Process message pending work item. Called from tasklet while holding
1430  * iucv_table_lock.
1431  */
1432 struct iucv_message_pending {
1433         u16 ippathid;
1434         u8  ipflags1;
1435         u8  iptype;
1436         u32 ipmsgid;
1437         u32 iptrgcls;
1438         union {
1439                 u32 iprmmsg1_u32;
1440                 u8  iprmmsg1[4];
1441         } ln1msg1;
1442         union {
1443                 u32 ipbfln1f;
1444                 u8  iprmmsg2[4];
1445         } ln1msg2;
1446         u32 res1[3];
1447         u32 ipbfln2f;
1448         u8  ippollfg;
1449         u8  res2[3];
1450 } __attribute__ ((packed));
1451
1452 static void iucv_message_pending(struct iucv_irq_data *data)
1453 {
1454         struct iucv_message_pending *imp = (void *) data;
1455         struct iucv_path *path = iucv_path_table[imp->ippathid];
1456         struct iucv_message msg;
1457
1458         if (path && path->handler && path->handler->message_pending) {
1459                 msg.flags = imp->ipflags1;
1460                 msg.id = imp->ipmsgid;
1461                 msg.class = imp->iptrgcls;
1462                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1463                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1464                         msg.length = 8;
1465                 } else
1466                         msg.length = imp->ln1msg2.ipbfln1f;
1467                 msg.reply_size = imp->ipbfln2f;
1468                 path->handler->message_pending(path, &msg);
1469         }
1470 }
1471
1472 /**
1473  * iucv_tasklet_fn:
1474  *
1475  * This tasklet loops over the queue of irq buffers created by
1476  * iucv_external_interrupt, calls the appropriate action handler
1477  * and then frees the buffer.
1478  */
1479 static void iucv_tasklet_fn(unsigned long ignored)
1480 {
1481         typedef void iucv_irq_fn(struct iucv_irq_data *);
1482         static iucv_irq_fn *irq_fn[] = {
1483                 [0x02] = iucv_path_complete,
1484                 [0x03] = iucv_path_severed,
1485                 [0x04] = iucv_path_quiesced,
1486                 [0x05] = iucv_path_resumed,
1487                 [0x06] = iucv_message_complete,
1488                 [0x07] = iucv_message_complete,
1489                 [0x08] = iucv_message_pending,
1490                 [0x09] = iucv_message_pending,
1491         };
1492         LIST_HEAD(task_queue);
1493         struct iucv_irq_list *p, *n;
1494
1495         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1496         if (!spin_trylock(&iucv_table_lock)) {
1497                 tasklet_schedule(&iucv_tasklet);
1498                 return;
1499         }
1500         iucv_active_cpu = smp_processor_id();
1501
1502         spin_lock_irq(&iucv_queue_lock);
1503         list_splice_init(&iucv_task_queue, &task_queue);
1504         spin_unlock_irq(&iucv_queue_lock);
1505
1506         list_for_each_entry_safe(p, n, &task_queue, list) {
1507                 list_del_init(&p->list);
1508                 irq_fn[p->data.iptype](&p->data);
1509                 kfree(p);
1510         }
1511
1512         iucv_active_cpu = -1;
1513         spin_unlock(&iucv_table_lock);
1514 }
1515
1516 /**
1517  * iucv_work_fn:
1518  *
1519  * This work function loops over the queue of path pending irq blocks
1520  * created by iucv_external_interrupt, calls the appropriate action
1521  * handler and then frees the buffer.
1522  */
1523 static void iucv_work_fn(struct work_struct *work)
1524 {
1525         typedef void iucv_irq_fn(struct iucv_irq_data *);
1526         LIST_HEAD(work_queue);
1527         struct iucv_irq_list *p, *n;
1528
1529         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1530         spin_lock_bh(&iucv_table_lock);
1531         iucv_active_cpu = smp_processor_id();
1532
1533         spin_lock_irq(&iucv_queue_lock);
1534         list_splice_init(&iucv_work_queue, &work_queue);
1535         spin_unlock_irq(&iucv_queue_lock);
1536
1537         iucv_cleanup_queue();
1538         list_for_each_entry_safe(p, n, &work_queue, list) {
1539                 list_del_init(&p->list);
1540                 iucv_path_pending(&p->data);
1541                 kfree(p);
1542         }
1543
1544         iucv_active_cpu = -1;
1545         spin_unlock_bh(&iucv_table_lock);
1546 }
1547
1548 /**
1549  * iucv_external_interrupt
1550  * @code: irq code
1551  *
1552  * Handles external interrupts coming in from CP.
1553  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1554  */
1555 static void iucv_external_interrupt(u16 code)
1556 {
1557         struct iucv_irq_data *p;
1558         struct iucv_irq_list *work;
1559
1560         p = iucv_irq_data[smp_processor_id()];
1561         if (p->ippathid >= iucv_max_pathid) {
1562                 printk(KERN_WARNING "iucv_do_int: Got interrupt with "
1563                        "pathid %d > max_connections (%ld)\n",
1564                        p->ippathid, iucv_max_pathid - 1);
1565                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1566                 return;
1567         }
1568         if (p->iptype  < 0x01 || p->iptype > 0x09) {
1569                 printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
1570                 return;
1571         }
1572         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1573         if (!work) {
1574                 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1575                 return;
1576         }
1577         memcpy(&work->data, p, sizeof(work->data));
1578         spin_lock(&iucv_queue_lock);
1579         if (p->iptype == 0x01) {
1580                 /* Path pending interrupt. */
1581                 list_add_tail(&work->list, &iucv_work_queue);
1582                 schedule_work(&iucv_work);
1583         } else {
1584                 /* The other interrupts. */
1585                 list_add_tail(&work->list, &iucv_task_queue);
1586                 tasklet_schedule(&iucv_tasklet);
1587         }
1588         spin_unlock(&iucv_queue_lock);
1589 }
1590
1591 /**
1592  * iucv_init
1593  *
1594  * Allocates and initializes various data structures.
1595  */
1596 static int __init iucv_init(void)
1597 {
1598         int rc;
1599         int cpu;
1600
1601         if (!MACHINE_IS_VM) {
1602                 rc = -EPROTONOSUPPORT;
1603                 goto out;
1604         }
1605         rc = iucv_query_maxconn();
1606         if (rc)
1607                 goto out;
1608         rc = register_external_interrupt(0x4000, iucv_external_interrupt);
1609         if (rc)
1610                 goto out;
1611         iucv_root = s390_root_dev_register("iucv");
1612         if (IS_ERR(iucv_root)) {
1613                 rc = PTR_ERR(iucv_root);
1614                 goto out_int;
1615         }
1616
1617         for_each_online_cpu(cpu) {
1618                 /* Note: GFP_DMA used to get memory below 2G */
1619                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1620                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1621                 if (!iucv_irq_data[cpu]) {
1622                         rc = -ENOMEM;
1623                         goto out_free;
1624                 }
1625
1626                 /* Allocate parameter blocks. */
1627                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1628                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1629                 if (!iucv_param[cpu]) {
1630                         rc = -ENOMEM;
1631                         goto out_free;
1632                 }
1633         }
1634         rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1635         if (rc)
1636                 goto out_free;
1637         ASCEBC(iucv_error_no_listener, 16);
1638         ASCEBC(iucv_error_no_memory, 16);
1639         ASCEBC(iucv_error_pathid, 16);
1640         iucv_available = 1;
1641         rc = bus_register(&iucv_bus);
1642         if (rc)
1643                 goto out_cpu;
1644         return 0;
1645
1646 out_cpu:
1647         unregister_hotcpu_notifier(&iucv_cpu_notifier);
1648 out_free:
1649         for_each_possible_cpu(cpu) {
1650                 kfree(iucv_param[cpu]);
1651                 iucv_param[cpu] = NULL;
1652                 kfree(iucv_irq_data[cpu]);
1653                 iucv_irq_data[cpu] = NULL;
1654         }
1655         s390_root_dev_unregister(iucv_root);
1656 out_int:
1657         unregister_external_interrupt(0x4000, iucv_external_interrupt);
1658 out:
1659         return rc;
1660 }
1661
1662 /**
1663  * iucv_exit
1664  *
1665  * Frees everything allocated from iucv_init.
1666  */
1667 static void __exit iucv_exit(void)
1668 {
1669         struct iucv_irq_list *p, *n;
1670         int cpu;
1671
1672         spin_lock_irq(&iucv_queue_lock);
1673         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1674                 kfree(p);
1675         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1676                 kfree(p);
1677         spin_unlock_irq(&iucv_queue_lock);
1678         unregister_hotcpu_notifier(&iucv_cpu_notifier);
1679         for_each_possible_cpu(cpu) {
1680                 kfree(iucv_param[cpu]);
1681                 iucv_param[cpu] = NULL;
1682                 kfree(iucv_irq_data[cpu]);
1683                 iucv_irq_data[cpu] = NULL;
1684         }
1685         s390_root_dev_unregister(iucv_root);
1686         bus_unregister(&iucv_bus);
1687         unregister_external_interrupt(0x4000, iucv_external_interrupt);
1688 }
1689
1690 subsys_initcall(iucv_init);
1691 module_exit(iucv_exit);
1692
1693 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1694 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1695 MODULE_LICENSE("GPL");