net: net_assign_generic() fix
[linux-2.6.git] / net / iucv / iucv.c
1 /*
2  * IUCV base infrastructure.
3  *
4  * Copyright IBM Corp. 2001, 2009
5  *
6  * Author(s):
7  *    Original source:
8  *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
9  *      Xenia Tkatschow (xenia@us.ibm.com)
10  *    2Gb awareness and general cleanup:
11  *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
12  *    Rewritten for af_iucv:
13  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
14  *    PM functions:
15  *      Ursula Braun (ursula.braun@de.ibm.com)
16  *
17  * Documentation used:
18  *    The original source
19  *    CP Programming Service, IBM document # SC24-5760
20  *
21  * This program is free software; you can redistribute it and/or modify
22  * it under the terms of the GNU General Public License as published by
23  * the Free Software Foundation; either version 2, or (at your option)
24  * any later version.
25  *
26  * This program is distributed in the hope that it will be useful,
27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
29  * GNU General Public License for more details.
30  *
31  * You should have received a copy of the GNU General Public License
32  * along with this program; if not, write to the Free Software
33  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34  */
35
36 #define KMSG_COMPONENT "iucv"
37 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
38
39 #include <linux/module.h>
40 #include <linux/moduleparam.h>
41 #include <linux/spinlock.h>
42 #include <linux/kernel.h>
43 #include <linux/slab.h>
44 #include <linux/init.h>
45 #include <linux/interrupt.h>
46 #include <linux/list.h>
47 #include <linux/errno.h>
48 #include <linux/err.h>
49 #include <linux/device.h>
50 #include <linux/cpu.h>
51 #include <linux/reboot.h>
52 #include <net/iucv/iucv.h>
53 #include <asm/atomic.h>
54 #include <asm/ebcdic.h>
55 #include <asm/io.h>
56 #include <asm/s390_ext.h>
57 #include <asm/smp.h>
58
59 /*
60  * FLAGS:
61  * All flags are defined in the field IPFLAGS1 of each function
62  * and can be found in CP Programming Services.
63  * IPSRCCLS - Indicates you have specified a source class.
64  * IPTRGCLS - Indicates you have specified a target class.
65  * IPFGPID  - Indicates you have specified a pathid.
66  * IPFGMID  - Indicates you have specified a message ID.
67  * IPNORPY  - Indicates a one-way message. No reply expected.
68  * IPALL    - Indicates that all paths are affected.
69  */
70 #define IUCV_IPSRCCLS   0x01
71 #define IUCV_IPTRGCLS   0x01
72 #define IUCV_IPFGPID    0x02
73 #define IUCV_IPFGMID    0x04
74 #define IUCV_IPNORPY    0x10
75 #define IUCV_IPALL      0x80
76
77 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
78 {
79         return 0;
80 }
81
82 static int iucv_pm_prepare(struct device *);
83 static void iucv_pm_complete(struct device *);
84 static int iucv_pm_freeze(struct device *);
85 static int iucv_pm_thaw(struct device *);
86 static int iucv_pm_restore(struct device *);
87
88 static struct dev_pm_ops iucv_pm_ops = {
89         .prepare = iucv_pm_prepare,
90         .complete = iucv_pm_complete,
91         .freeze = iucv_pm_freeze,
92         .thaw = iucv_pm_thaw,
93         .restore = iucv_pm_restore,
94 };
95
96 struct bus_type iucv_bus = {
97         .name = "iucv",
98         .match = iucv_bus_match,
99         .pm = &iucv_pm_ops,
100 };
101 EXPORT_SYMBOL(iucv_bus);
102
103 struct device *iucv_root;
104 EXPORT_SYMBOL(iucv_root);
105
106 static int iucv_available;
107
108 /* General IUCV interrupt structure */
109 struct iucv_irq_data {
110         u16 ippathid;
111         u8  ipflags1;
112         u8  iptype;
113         u32 res2[8];
114 };
115
116 struct iucv_irq_list {
117         struct list_head list;
118         struct iucv_irq_data data;
119 };
120
121 static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
122 static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
123 static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
124
125 /*
126  * Queue of interrupt buffers lock for delivery via the tasklet
127  * (fast but can't call smp_call_function).
128  */
129 static LIST_HEAD(iucv_task_queue);
130
131 /*
132  * The tasklet for fast delivery of iucv interrupts.
133  */
134 static void iucv_tasklet_fn(unsigned long);
135 static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
136
137 /*
138  * Queue of interrupt buffers for delivery via a work queue
139  * (slower but can call smp_call_function).
140  */
141 static LIST_HEAD(iucv_work_queue);
142
143 /*
144  * The work element to deliver path pending interrupts.
145  */
146 static void iucv_work_fn(struct work_struct *work);
147 static DECLARE_WORK(iucv_work, iucv_work_fn);
148
149 /*
150  * Spinlock protecting task and work queue.
151  */
152 static DEFINE_SPINLOCK(iucv_queue_lock);
153
154 enum iucv_command_codes {
155         IUCV_QUERY = 0,
156         IUCV_RETRIEVE_BUFFER = 2,
157         IUCV_SEND = 4,
158         IUCV_RECEIVE = 5,
159         IUCV_REPLY = 6,
160         IUCV_REJECT = 8,
161         IUCV_PURGE = 9,
162         IUCV_ACCEPT = 10,
163         IUCV_CONNECT = 11,
164         IUCV_DECLARE_BUFFER = 12,
165         IUCV_QUIESCE = 13,
166         IUCV_RESUME = 14,
167         IUCV_SEVER = 15,
168         IUCV_SETMASK = 16,
169         IUCV_SETCONTROLMASK = 17,
170 };
171
172 /*
173  * Error messages that are used with the iucv_sever function. They get
174  * converted to EBCDIC.
175  */
176 static char iucv_error_no_listener[16] = "NO LISTENER";
177 static char iucv_error_no_memory[16] = "NO MEMORY";
178 static char iucv_error_pathid[16] = "INVALID PATHID";
179
180 /*
181  * iucv_handler_list: List of registered handlers.
182  */
183 static LIST_HEAD(iucv_handler_list);
184
185 /*
186  * iucv_path_table: an array of iucv_path structures.
187  */
188 static struct iucv_path **iucv_path_table;
189 static unsigned long iucv_max_pathid;
190
191 /*
192  * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
193  */
194 static DEFINE_SPINLOCK(iucv_table_lock);
195
196 /*
197  * iucv_active_cpu: contains the number of the cpu executing the tasklet
198  * or the work handler. Needed for iucv_path_sever called from tasklet.
199  */
200 static int iucv_active_cpu = -1;
201
202 /*
203  * Mutex and wait queue for iucv_register/iucv_unregister.
204  */
205 static DEFINE_MUTEX(iucv_register_mutex);
206
207 /*
208  * Counter for number of non-smp capable handlers.
209  */
210 static int iucv_nonsmp_handler;
211
212 /*
213  * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
214  * iucv_path_quiesce and iucv_path_sever.
215  */
216 struct iucv_cmd_control {
217         u16 ippathid;
218         u8  ipflags1;
219         u8  iprcode;
220         u16 ipmsglim;
221         u16 res1;
222         u8  ipvmid[8];
223         u8  ipuser[16];
224         u8  iptarget[8];
225 } __attribute__ ((packed,aligned(8)));
226
227 /*
228  * Data in parameter list iucv structure. Used by iucv_message_send,
229  * iucv_message_send2way and iucv_message_reply.
230  */
231 struct iucv_cmd_dpl {
232         u16 ippathid;
233         u8  ipflags1;
234         u8  iprcode;
235         u32 ipmsgid;
236         u32 iptrgcls;
237         u8  iprmmsg[8];
238         u32 ipsrccls;
239         u32 ipmsgtag;
240         u32 ipbfadr2;
241         u32 ipbfln2f;
242         u32 res;
243 } __attribute__ ((packed,aligned(8)));
244
245 /*
246  * Data in buffer iucv structure. Used by iucv_message_receive,
247  * iucv_message_reject, iucv_message_send, iucv_message_send2way
248  * and iucv_declare_cpu.
249  */
250 struct iucv_cmd_db {
251         u16 ippathid;
252         u8  ipflags1;
253         u8  iprcode;
254         u32 ipmsgid;
255         u32 iptrgcls;
256         u32 ipbfadr1;
257         u32 ipbfln1f;
258         u32 ipsrccls;
259         u32 ipmsgtag;
260         u32 ipbfadr2;
261         u32 ipbfln2f;
262         u32 res;
263 } __attribute__ ((packed,aligned(8)));
264
265 /*
266  * Purge message iucv structure. Used by iucv_message_purge.
267  */
268 struct iucv_cmd_purge {
269         u16 ippathid;
270         u8  ipflags1;
271         u8  iprcode;
272         u32 ipmsgid;
273         u8  ipaudit[3];
274         u8  res1[5];
275         u32 res2;
276         u32 ipsrccls;
277         u32 ipmsgtag;
278         u32 res3[3];
279 } __attribute__ ((packed,aligned(8)));
280
281 /*
282  * Set mask iucv structure. Used by iucv_enable_cpu.
283  */
284 struct iucv_cmd_set_mask {
285         u8  ipmask;
286         u8  res1[2];
287         u8  iprcode;
288         u32 res2[9];
289 } __attribute__ ((packed,aligned(8)));
290
291 union iucv_param {
292         struct iucv_cmd_control ctrl;
293         struct iucv_cmd_dpl dpl;
294         struct iucv_cmd_db db;
295         struct iucv_cmd_purge purge;
296         struct iucv_cmd_set_mask set_mask;
297 };
298
299 /*
300  * Anchor for per-cpu IUCV command parameter block.
301  */
302 static union iucv_param *iucv_param[NR_CPUS];
303 static union iucv_param *iucv_param_irq[NR_CPUS];
304
305 /**
306  * iucv_call_b2f0
307  * @code: identifier of IUCV call to CP.
308  * @parm: pointer to a struct iucv_parm block
309  *
310  * Calls CP to execute IUCV commands.
311  *
312  * Returns the result of the CP IUCV call.
313  */
314 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
315 {
316         register unsigned long reg0 asm ("0");
317         register unsigned long reg1 asm ("1");
318         int ccode;
319
320         reg0 = command;
321         reg1 = virt_to_phys(parm);
322         asm volatile(
323                 "       .long 0xb2f01000\n"
324                 "       ipm     %0\n"
325                 "       srl     %0,28\n"
326                 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
327                 :  "m" (*parm) : "cc");
328         return (ccode == 1) ? parm->ctrl.iprcode : ccode;
329 }
330
331 /**
332  * iucv_query_maxconn
333  *
334  * Determines the maximum number of connections that may be established.
335  *
336  * Returns the maximum number of connections or -EPERM is IUCV is not
337  * available.
338  */
339 static int iucv_query_maxconn(void)
340 {
341         register unsigned long reg0 asm ("0");
342         register unsigned long reg1 asm ("1");
343         void *param;
344         int ccode;
345
346         param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
347         if (!param)
348                 return -ENOMEM;
349         reg0 = IUCV_QUERY;
350         reg1 = (unsigned long) param;
351         asm volatile (
352                 "       .long   0xb2f01000\n"
353                 "       ipm     %0\n"
354                 "       srl     %0,28\n"
355                 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
356         if (ccode == 0)
357                 iucv_max_pathid = reg0;
358         kfree(param);
359         return ccode ? -EPERM : 0;
360 }
361
362 /**
363  * iucv_allow_cpu
364  * @data: unused
365  *
366  * Allow iucv interrupts on this cpu.
367  */
368 static void iucv_allow_cpu(void *data)
369 {
370         int cpu = smp_processor_id();
371         union iucv_param *parm;
372
373         /*
374          * Enable all iucv interrupts.
375          * ipmask contains bits for the different interrupts
376          *      0x80 - Flag to allow nonpriority message pending interrupts
377          *      0x40 - Flag to allow priority message pending interrupts
378          *      0x20 - Flag to allow nonpriority message completion interrupts
379          *      0x10 - Flag to allow priority message completion interrupts
380          *      0x08 - Flag to allow IUCV control interrupts
381          */
382         parm = iucv_param_irq[cpu];
383         memset(parm, 0, sizeof(union iucv_param));
384         parm->set_mask.ipmask = 0xf8;
385         iucv_call_b2f0(IUCV_SETMASK, parm);
386
387         /*
388          * Enable all iucv control interrupts.
389          * ipmask contains bits for the different interrupts
390          *      0x80 - Flag to allow pending connections interrupts
391          *      0x40 - Flag to allow connection complete interrupts
392          *      0x20 - Flag to allow connection severed interrupts
393          *      0x10 - Flag to allow connection quiesced interrupts
394          *      0x08 - Flag to allow connection resumed interrupts
395          */
396         memset(parm, 0, sizeof(union iucv_param));
397         parm->set_mask.ipmask = 0xf8;
398         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
399         /* Set indication that iucv interrupts are allowed for this cpu. */
400         cpu_set(cpu, iucv_irq_cpumask);
401 }
402
403 /**
404  * iucv_block_cpu
405  * @data: unused
406  *
407  * Block iucv interrupts on this cpu.
408  */
409 static void iucv_block_cpu(void *data)
410 {
411         int cpu = smp_processor_id();
412         union iucv_param *parm;
413
414         /* Disable all iucv interrupts. */
415         parm = iucv_param_irq[cpu];
416         memset(parm, 0, sizeof(union iucv_param));
417         iucv_call_b2f0(IUCV_SETMASK, parm);
418
419         /* Clear indication that iucv interrupts are allowed for this cpu. */
420         cpu_clear(cpu, iucv_irq_cpumask);
421 }
422
423 /**
424  * iucv_block_cpu_almost
425  * @data: unused
426  *
427  * Allow connection-severed interrupts only on this cpu.
428  */
429 static void iucv_block_cpu_almost(void *data)
430 {
431         int cpu = smp_processor_id();
432         union iucv_param *parm;
433
434         /* Allow iucv control interrupts only */
435         parm = iucv_param_irq[cpu];
436         memset(parm, 0, sizeof(union iucv_param));
437         parm->set_mask.ipmask = 0x08;
438         iucv_call_b2f0(IUCV_SETMASK, parm);
439         /* Allow iucv-severed interrupt only */
440         memset(parm, 0, sizeof(union iucv_param));
441         parm->set_mask.ipmask = 0x20;
442         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
443
444         /* Clear indication that iucv interrupts are allowed for this cpu. */
445         cpu_clear(cpu, iucv_irq_cpumask);
446 }
447
448 /**
449  * iucv_declare_cpu
450  * @data: unused
451  *
452  * Declare a interrupt buffer on this cpu.
453  */
454 static void iucv_declare_cpu(void *data)
455 {
456         int cpu = smp_processor_id();
457         union iucv_param *parm;
458         int rc;
459
460         if (cpu_isset(cpu, iucv_buffer_cpumask))
461                 return;
462
463         /* Declare interrupt buffer. */
464         parm = iucv_param_irq[cpu];
465         memset(parm, 0, sizeof(union iucv_param));
466         parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
467         rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
468         if (rc) {
469                 char *err = "Unknown";
470                 switch (rc) {
471                 case 0x03:
472                         err = "Directory error";
473                         break;
474                 case 0x0a:
475                         err = "Invalid length";
476                         break;
477                 case 0x13:
478                         err = "Buffer already exists";
479                         break;
480                 case 0x3e:
481                         err = "Buffer overlap";
482                         break;
483                 case 0x5c:
484                         err = "Paging or storage error";
485                         break;
486                 }
487                 pr_warning("Defining an interrupt buffer on CPU %i"
488                            " failed with 0x%02x (%s)\n", cpu, rc, err);
489                 return;
490         }
491
492         /* Set indication that an iucv buffer exists for this cpu. */
493         cpu_set(cpu, iucv_buffer_cpumask);
494
495         if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
496                 /* Enable iucv interrupts on this cpu. */
497                 iucv_allow_cpu(NULL);
498         else
499                 /* Disable iucv interrupts on this cpu. */
500                 iucv_block_cpu(NULL);
501 }
502
503 /**
504  * iucv_retrieve_cpu
505  * @data: unused
506  *
507  * Retrieve interrupt buffer on this cpu.
508  */
509 static void iucv_retrieve_cpu(void *data)
510 {
511         int cpu = smp_processor_id();
512         union iucv_param *parm;
513
514         if (!cpu_isset(cpu, iucv_buffer_cpumask))
515                 return;
516
517         /* Block iucv interrupts. */
518         iucv_block_cpu(NULL);
519
520         /* Retrieve interrupt buffer. */
521         parm = iucv_param_irq[cpu];
522         iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
523
524         /* Clear indication that an iucv buffer exists for this cpu. */
525         cpu_clear(cpu, iucv_buffer_cpumask);
526 }
527
528 /**
529  * iucv_setmask_smp
530  *
531  * Allow iucv interrupts on all cpus.
532  */
533 static void iucv_setmask_mp(void)
534 {
535         int cpu;
536
537         get_online_cpus();
538         for_each_online_cpu(cpu)
539                 /* Enable all cpus with a declared buffer. */
540                 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
541                     !cpu_isset(cpu, iucv_irq_cpumask))
542                         smp_call_function_single(cpu, iucv_allow_cpu,
543                                                  NULL, 1);
544         put_online_cpus();
545 }
546
547 /**
548  * iucv_setmask_up
549  *
550  * Allow iucv interrupts on a single cpu.
551  */
552 static void iucv_setmask_up(void)
553 {
554         cpumask_t cpumask;
555         int cpu;
556
557         /* Disable all cpu but the first in cpu_irq_cpumask. */
558         cpumask = iucv_irq_cpumask;
559         cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
560         for_each_cpu_mask_nr(cpu, cpumask)
561                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
562 }
563
564 /**
565  * iucv_enable
566  *
567  * This function makes iucv ready for use. It allocates the pathid
568  * table, declares an iucv interrupt buffer and enables the iucv
569  * interrupts. Called when the first user has registered an iucv
570  * handler.
571  */
572 static int iucv_enable(void)
573 {
574         size_t alloc_size;
575         int cpu, rc;
576
577         get_online_cpus();
578         rc = -ENOMEM;
579         alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
580         iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
581         if (!iucv_path_table)
582                 goto out;
583         /* Declare per cpu buffers. */
584         rc = -EIO;
585         for_each_online_cpu(cpu)
586                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
587         if (cpus_empty(iucv_buffer_cpumask))
588                 /* No cpu could declare an iucv buffer. */
589                 goto out;
590         put_online_cpus();
591         return 0;
592 out:
593         kfree(iucv_path_table);
594         iucv_path_table = NULL;
595         put_online_cpus();
596         return rc;
597 }
598
599 /**
600  * iucv_disable
601  *
602  * This function shuts down iucv. It disables iucv interrupts, retrieves
603  * the iucv interrupt buffer and frees the pathid table. Called after the
604  * last user unregister its iucv handler.
605  */
606 static void iucv_disable(void)
607 {
608         get_online_cpus();
609         on_each_cpu(iucv_retrieve_cpu, NULL, 1);
610         kfree(iucv_path_table);
611         iucv_path_table = NULL;
612         put_online_cpus();
613 }
614
615 static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
616                                      unsigned long action, void *hcpu)
617 {
618         cpumask_t cpumask;
619         long cpu = (long) hcpu;
620
621         switch (action) {
622         case CPU_UP_PREPARE:
623         case CPU_UP_PREPARE_FROZEN:
624                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
625                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
626                 if (!iucv_irq_data[cpu])
627                         return NOTIFY_BAD;
628                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
629                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
630                 if (!iucv_param[cpu]) {
631                         kfree(iucv_irq_data[cpu]);
632                         iucv_irq_data[cpu] = NULL;
633                         return NOTIFY_BAD;
634                 }
635                 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
636                                         GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
637                 if (!iucv_param_irq[cpu]) {
638                         kfree(iucv_param[cpu]);
639                         iucv_param[cpu] = NULL;
640                         kfree(iucv_irq_data[cpu]);
641                         iucv_irq_data[cpu] = NULL;
642                         return NOTIFY_BAD;
643                 }
644                 break;
645         case CPU_UP_CANCELED:
646         case CPU_UP_CANCELED_FROZEN:
647         case CPU_DEAD:
648         case CPU_DEAD_FROZEN:
649                 kfree(iucv_param_irq[cpu]);
650                 iucv_param_irq[cpu] = NULL;
651                 kfree(iucv_param[cpu]);
652                 iucv_param[cpu] = NULL;
653                 kfree(iucv_irq_data[cpu]);
654                 iucv_irq_data[cpu] = NULL;
655                 break;
656         case CPU_ONLINE:
657         case CPU_ONLINE_FROZEN:
658         case CPU_DOWN_FAILED:
659         case CPU_DOWN_FAILED_FROZEN:
660                 if (!iucv_path_table)
661                         break;
662                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
663                 break;
664         case CPU_DOWN_PREPARE:
665         case CPU_DOWN_PREPARE_FROZEN:
666                 if (!iucv_path_table)
667                         break;
668                 cpumask = iucv_buffer_cpumask;
669                 cpu_clear(cpu, cpumask);
670                 if (cpus_empty(cpumask))
671                         /* Can't offline last IUCV enabled cpu. */
672                         return NOTIFY_BAD;
673                 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
674                 if (cpus_empty(iucv_irq_cpumask))
675                         smp_call_function_single(first_cpu(iucv_buffer_cpumask),
676                                                  iucv_allow_cpu, NULL, 1);
677                 break;
678         }
679         return NOTIFY_OK;
680 }
681
682 static struct notifier_block __refdata iucv_cpu_notifier = {
683         .notifier_call = iucv_cpu_notify,
684 };
685
686 /**
687  * iucv_sever_pathid
688  * @pathid: path identification number.
689  * @userdata: 16-bytes of user data.
690  *
691  * Sever an iucv path to free up the pathid. Used internally.
692  */
693 static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
694 {
695         union iucv_param *parm;
696
697         parm = iucv_param_irq[smp_processor_id()];
698         memset(parm, 0, sizeof(union iucv_param));
699         if (userdata)
700                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
701         parm->ctrl.ippathid = pathid;
702         return iucv_call_b2f0(IUCV_SEVER, parm);
703 }
704
705 /**
706  * __iucv_cleanup_queue
707  * @dummy: unused dummy argument
708  *
709  * Nop function called via smp_call_function to force work items from
710  * pending external iucv interrupts to the work queue.
711  */
712 static void __iucv_cleanup_queue(void *dummy)
713 {
714 }
715
716 /**
717  * iucv_cleanup_queue
718  *
719  * Function called after a path has been severed to find all remaining
720  * work items for the now stale pathid. The caller needs to hold the
721  * iucv_table_lock.
722  */
723 static void iucv_cleanup_queue(void)
724 {
725         struct iucv_irq_list *p, *n;
726
727         /*
728          * When a path is severed, the pathid can be reused immediatly
729          * on a iucv connect or a connection pending interrupt. Remove
730          * all entries from the task queue that refer to a stale pathid
731          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
732          * or deliver the connection pending interrupt. To get all the
733          * pending interrupts force them to the work queue by calling
734          * an empty function on all cpus.
735          */
736         smp_call_function(__iucv_cleanup_queue, NULL, 1);
737         spin_lock_irq(&iucv_queue_lock);
738         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
739                 /* Remove stale work items from the task queue. */
740                 if (iucv_path_table[p->data.ippathid] == NULL) {
741                         list_del(&p->list);
742                         kfree(p);
743                 }
744         }
745         spin_unlock_irq(&iucv_queue_lock);
746 }
747
748 /**
749  * iucv_register:
750  * @handler: address of iucv handler structure
751  * @smp: != 0 indicates that the handler can deal with out of order messages
752  *
753  * Registers a driver with IUCV.
754  *
755  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
756  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
757  */
758 int iucv_register(struct iucv_handler *handler, int smp)
759 {
760         int rc;
761
762         if (!iucv_available)
763                 return -ENOSYS;
764         mutex_lock(&iucv_register_mutex);
765         if (!smp)
766                 iucv_nonsmp_handler++;
767         if (list_empty(&iucv_handler_list)) {
768                 rc = iucv_enable();
769                 if (rc)
770                         goto out_mutex;
771         } else if (!smp && iucv_nonsmp_handler == 1)
772                 iucv_setmask_up();
773         INIT_LIST_HEAD(&handler->paths);
774
775         spin_lock_bh(&iucv_table_lock);
776         list_add_tail(&handler->list, &iucv_handler_list);
777         spin_unlock_bh(&iucv_table_lock);
778         rc = 0;
779 out_mutex:
780         mutex_unlock(&iucv_register_mutex);
781         return rc;
782 }
783 EXPORT_SYMBOL(iucv_register);
784
785 /**
786  * iucv_unregister
787  * @handler:  address of iucv handler structure
788  * @smp: != 0 indicates that the handler can deal with out of order messages
789  *
790  * Unregister driver from IUCV.
791  */
792 void iucv_unregister(struct iucv_handler *handler, int smp)
793 {
794         struct iucv_path *p, *n;
795
796         mutex_lock(&iucv_register_mutex);
797         spin_lock_bh(&iucv_table_lock);
798         /* Remove handler from the iucv_handler_list. */
799         list_del_init(&handler->list);
800         /* Sever all pathids still refering to the handler. */
801         list_for_each_entry_safe(p, n, &handler->paths, list) {
802                 iucv_sever_pathid(p->pathid, NULL);
803                 iucv_path_table[p->pathid] = NULL;
804                 list_del(&p->list);
805                 iucv_path_free(p);
806         }
807         spin_unlock_bh(&iucv_table_lock);
808         if (!smp)
809                 iucv_nonsmp_handler--;
810         if (list_empty(&iucv_handler_list))
811                 iucv_disable();
812         else if (!smp && iucv_nonsmp_handler == 0)
813                 iucv_setmask_mp();
814         mutex_unlock(&iucv_register_mutex);
815 }
816 EXPORT_SYMBOL(iucv_unregister);
817
818 static int iucv_reboot_event(struct notifier_block *this,
819                              unsigned long event, void *ptr)
820 {
821         int i, rc;
822
823         get_online_cpus();
824         on_each_cpu(iucv_block_cpu, NULL, 1);
825         preempt_disable();
826         for (i = 0; i < iucv_max_pathid; i++) {
827                 if (iucv_path_table[i])
828                         rc = iucv_sever_pathid(i, NULL);
829         }
830         preempt_enable();
831         put_online_cpus();
832         iucv_disable();
833         return NOTIFY_DONE;
834 }
835
836 static struct notifier_block iucv_reboot_notifier = {
837         .notifier_call = iucv_reboot_event,
838 };
839
840 /**
841  * iucv_path_accept
842  * @path: address of iucv path structure
843  * @handler: address of iucv handler structure
844  * @userdata: 16 bytes of data reflected to the communication partner
845  * @private: private data passed to interrupt handlers for this path
846  *
847  * This function is issued after the user received a connection pending
848  * external interrupt and now wishes to complete the IUCV communication path.
849  *
850  * Returns the result of the CP IUCV call.
851  */
852 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
853                      u8 userdata[16], void *private)
854 {
855         union iucv_param *parm;
856         int rc;
857
858         local_bh_disable();
859         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
860                 rc = -EIO;
861                 goto out;
862         }
863         /* Prepare parameter block. */
864         parm = iucv_param[smp_processor_id()];
865         memset(parm, 0, sizeof(union iucv_param));
866         parm->ctrl.ippathid = path->pathid;
867         parm->ctrl.ipmsglim = path->msglim;
868         if (userdata)
869                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
870         parm->ctrl.ipflags1 = path->flags;
871
872         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
873         if (!rc) {
874                 path->private = private;
875                 path->msglim = parm->ctrl.ipmsglim;
876                 path->flags = parm->ctrl.ipflags1;
877         }
878 out:
879         local_bh_enable();
880         return rc;
881 }
882 EXPORT_SYMBOL(iucv_path_accept);
883
884 /**
885  * iucv_path_connect
886  * @path: address of iucv path structure
887  * @handler: address of iucv handler structure
888  * @userid: 8-byte user identification
889  * @system: 8-byte target system identification
890  * @userdata: 16 bytes of data reflected to the communication partner
891  * @private: private data passed to interrupt handlers for this path
892  *
893  * This function establishes an IUCV path. Although the connect may complete
894  * successfully, you are not able to use the path until you receive an IUCV
895  * Connection Complete external interrupt.
896  *
897  * Returns the result of the CP IUCV call.
898  */
899 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
900                       u8 userid[8], u8 system[8], u8 userdata[16],
901                       void *private)
902 {
903         union iucv_param *parm;
904         int rc;
905
906         spin_lock_bh(&iucv_table_lock);
907         iucv_cleanup_queue();
908         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
909                 rc = -EIO;
910                 goto out;
911         }
912         parm = iucv_param[smp_processor_id()];
913         memset(parm, 0, sizeof(union iucv_param));
914         parm->ctrl.ipmsglim = path->msglim;
915         parm->ctrl.ipflags1 = path->flags;
916         if (userid) {
917                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
918                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
919                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
920         }
921         if (system) {
922                 memcpy(parm->ctrl.iptarget, system,
923                        sizeof(parm->ctrl.iptarget));
924                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
925                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
926         }
927         if (userdata)
928                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
929
930         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
931         if (!rc) {
932                 if (parm->ctrl.ippathid < iucv_max_pathid) {
933                         path->pathid = parm->ctrl.ippathid;
934                         path->msglim = parm->ctrl.ipmsglim;
935                         path->flags = parm->ctrl.ipflags1;
936                         path->handler = handler;
937                         path->private = private;
938                         list_add_tail(&path->list, &handler->paths);
939                         iucv_path_table[path->pathid] = path;
940                 } else {
941                         iucv_sever_pathid(parm->ctrl.ippathid,
942                                           iucv_error_pathid);
943                         rc = -EIO;
944                 }
945         }
946 out:
947         spin_unlock_bh(&iucv_table_lock);
948         return rc;
949 }
950 EXPORT_SYMBOL(iucv_path_connect);
951
952 /**
953  * iucv_path_quiesce:
954  * @path: address of iucv path structure
955  * @userdata: 16 bytes of data reflected to the communication partner
956  *
957  * This function temporarily suspends incoming messages on an IUCV path.
958  * You can later reactivate the path by invoking the iucv_resume function.
959  *
960  * Returns the result from the CP IUCV call.
961  */
962 int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
963 {
964         union iucv_param *parm;
965         int rc;
966
967         local_bh_disable();
968         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
969                 rc = -EIO;
970                 goto out;
971         }
972         parm = iucv_param[smp_processor_id()];
973         memset(parm, 0, sizeof(union iucv_param));
974         if (userdata)
975                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
976         parm->ctrl.ippathid = path->pathid;
977         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
978 out:
979         local_bh_enable();
980         return rc;
981 }
982 EXPORT_SYMBOL(iucv_path_quiesce);
983
984 /**
985  * iucv_path_resume:
986  * @path: address of iucv path structure
987  * @userdata: 16 bytes of data reflected to the communication partner
988  *
989  * This function resumes incoming messages on an IUCV path that has
990  * been stopped with iucv_path_quiesce.
991  *
992  * Returns the result from the CP IUCV call.
993  */
994 int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
995 {
996         union iucv_param *parm;
997         int rc;
998
999         local_bh_disable();
1000         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1001                 rc = -EIO;
1002                 goto out;
1003         }
1004         parm = iucv_param[smp_processor_id()];
1005         memset(parm, 0, sizeof(union iucv_param));
1006         if (userdata)
1007                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1008         parm->ctrl.ippathid = path->pathid;
1009         rc = iucv_call_b2f0(IUCV_RESUME, parm);
1010 out:
1011         local_bh_enable();
1012         return rc;
1013 }
1014
1015 /**
1016  * iucv_path_sever
1017  * @path: address of iucv path structure
1018  * @userdata: 16 bytes of data reflected to the communication partner
1019  *
1020  * This function terminates an IUCV path.
1021  *
1022  * Returns the result from the CP IUCV call.
1023  */
1024 int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1025 {
1026         int rc;
1027
1028         preempt_disable();
1029         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1030                 rc = -EIO;
1031                 goto out;
1032         }
1033         if (iucv_active_cpu != smp_processor_id())
1034                 spin_lock_bh(&iucv_table_lock);
1035         rc = iucv_sever_pathid(path->pathid, userdata);
1036         iucv_path_table[path->pathid] = NULL;
1037         list_del_init(&path->list);
1038         if (iucv_active_cpu != smp_processor_id())
1039                 spin_unlock_bh(&iucv_table_lock);
1040 out:
1041         preempt_enable();
1042         return rc;
1043 }
1044 EXPORT_SYMBOL(iucv_path_sever);
1045
1046 /**
1047  * iucv_message_purge
1048  * @path: address of iucv path structure
1049  * @msg: address of iucv msg structure
1050  * @srccls: source class of message
1051  *
1052  * Cancels a message you have sent.
1053  *
1054  * Returns the result from the CP IUCV call.
1055  */
1056 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1057                        u32 srccls)
1058 {
1059         union iucv_param *parm;
1060         int rc;
1061
1062         local_bh_disable();
1063         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1064                 rc = -EIO;
1065                 goto out;
1066         }
1067         parm = iucv_param[smp_processor_id()];
1068         memset(parm, 0, sizeof(union iucv_param));
1069         parm->purge.ippathid = path->pathid;
1070         parm->purge.ipmsgid = msg->id;
1071         parm->purge.ipsrccls = srccls;
1072         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1073         rc = iucv_call_b2f0(IUCV_PURGE, parm);
1074         if (!rc) {
1075                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1076                 msg->tag = parm->purge.ipmsgtag;
1077         }
1078 out:
1079         local_bh_enable();
1080         return rc;
1081 }
1082 EXPORT_SYMBOL(iucv_message_purge);
1083
1084 /**
1085  * iucv_message_receive_iprmdata
1086  * @path: address of iucv path structure
1087  * @msg: address of iucv msg structure
1088  * @flags: how the message is received (IUCV_IPBUFLST)
1089  * @buffer: address of data buffer or address of struct iucv_array
1090  * @size: length of data buffer
1091  * @residual:
1092  *
1093  * Internal function used by iucv_message_receive and __iucv_message_receive
1094  * to receive RMDATA data stored in struct iucv_message.
1095  */
1096 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1097                                          struct iucv_message *msg,
1098                                          u8 flags, void *buffer,
1099                                          size_t size, size_t *residual)
1100 {
1101         struct iucv_array *array;
1102         u8 *rmmsg;
1103         size_t copy;
1104
1105         /*
1106          * Message is 8 bytes long and has been stored to the
1107          * message descriptor itself.
1108          */
1109         if (residual)
1110                 *residual = abs(size - 8);
1111         rmmsg = msg->rmmsg;
1112         if (flags & IUCV_IPBUFLST) {
1113                 /* Copy to struct iucv_array. */
1114                 size = (size < 8) ? size : 8;
1115                 for (array = buffer; size > 0; array++) {
1116                         copy = min_t(size_t, size, array->length);
1117                         memcpy((u8 *)(addr_t) array->address,
1118                                 rmmsg, copy);
1119                         rmmsg += copy;
1120                         size -= copy;
1121                 }
1122         } else {
1123                 /* Copy to direct buffer. */
1124                 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1125         }
1126         return 0;
1127 }
1128
1129 /**
1130  * __iucv_message_receive
1131  * @path: address of iucv path structure
1132  * @msg: address of iucv msg structure
1133  * @flags: how the message is received (IUCV_IPBUFLST)
1134  * @buffer: address of data buffer or address of struct iucv_array
1135  * @size: length of data buffer
1136  * @residual:
1137  *
1138  * This function receives messages that are being sent to you over
1139  * established paths. This function will deal with RMDATA messages
1140  * embedded in struct iucv_message as well.
1141  *
1142  * Locking:     no locking
1143  *
1144  * Returns the result from the CP IUCV call.
1145  */
1146 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1147                            u8 flags, void *buffer, size_t size, size_t *residual)
1148 {
1149         union iucv_param *parm;
1150         int rc;
1151
1152         if (msg->flags & IUCV_IPRMDATA)
1153                 return iucv_message_receive_iprmdata(path, msg, flags,
1154                                                      buffer, size, residual);
1155         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1156                 rc = -EIO;
1157                 goto out;
1158         }
1159         parm = iucv_param[smp_processor_id()];
1160         memset(parm, 0, sizeof(union iucv_param));
1161         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1162         parm->db.ipbfln1f = (u32) size;
1163         parm->db.ipmsgid = msg->id;
1164         parm->db.ippathid = path->pathid;
1165         parm->db.iptrgcls = msg->class;
1166         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1167                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1168         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1169         if (!rc || rc == 5) {
1170                 msg->flags = parm->db.ipflags1;
1171                 if (residual)
1172                         *residual = parm->db.ipbfln1f;
1173         }
1174 out:
1175         return rc;
1176 }
1177 EXPORT_SYMBOL(__iucv_message_receive);
1178
1179 /**
1180  * iucv_message_receive
1181  * @path: address of iucv path structure
1182  * @msg: address of iucv msg structure
1183  * @flags: how the message is received (IUCV_IPBUFLST)
1184  * @buffer: address of data buffer or address of struct iucv_array
1185  * @size: length of data buffer
1186  * @residual:
1187  *
1188  * This function receives messages that are being sent to you over
1189  * established paths. This function will deal with RMDATA messages
1190  * embedded in struct iucv_message as well.
1191  *
1192  * Locking:     local_bh_enable/local_bh_disable
1193  *
1194  * Returns the result from the CP IUCV call.
1195  */
1196 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1197                          u8 flags, void *buffer, size_t size, size_t *residual)
1198 {
1199         int rc;
1200
1201         if (msg->flags & IUCV_IPRMDATA)
1202                 return iucv_message_receive_iprmdata(path, msg, flags,
1203                                                      buffer, size, residual);
1204         local_bh_disable();
1205         rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1206         local_bh_enable();
1207         return rc;
1208 }
1209 EXPORT_SYMBOL(iucv_message_receive);
1210
1211 /**
1212  * iucv_message_reject
1213  * @path: address of iucv path structure
1214  * @msg: address of iucv msg structure
1215  *
1216  * The reject function refuses a specified message. Between the time you
1217  * are notified of a message and the time that you complete the message,
1218  * the message may be rejected.
1219  *
1220  * Returns the result from the CP IUCV call.
1221  */
1222 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1223 {
1224         union iucv_param *parm;
1225         int rc;
1226
1227         local_bh_disable();
1228         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1229                 rc = -EIO;
1230                 goto out;
1231         }
1232         parm = iucv_param[smp_processor_id()];
1233         memset(parm, 0, sizeof(union iucv_param));
1234         parm->db.ippathid = path->pathid;
1235         parm->db.ipmsgid = msg->id;
1236         parm->db.iptrgcls = msg->class;
1237         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1238         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1239 out:
1240         local_bh_enable();
1241         return rc;
1242 }
1243 EXPORT_SYMBOL(iucv_message_reject);
1244
1245 /**
1246  * iucv_message_reply
1247  * @path: address of iucv path structure
1248  * @msg: address of iucv msg structure
1249  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1250  * @reply: address of reply data buffer or address of struct iucv_array
1251  * @size: length of reply data buffer
1252  *
1253  * This function responds to the two-way messages that you receive. You
1254  * must identify completely the message to which you wish to reply. ie,
1255  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1256  * the parameter list.
1257  *
1258  * Returns the result from the CP IUCV call.
1259  */
1260 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1261                        u8 flags, void *reply, size_t size)
1262 {
1263         union iucv_param *parm;
1264         int rc;
1265
1266         local_bh_disable();
1267         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1268                 rc = -EIO;
1269                 goto out;
1270         }
1271         parm = iucv_param[smp_processor_id()];
1272         memset(parm, 0, sizeof(union iucv_param));
1273         if (flags & IUCV_IPRMDATA) {
1274                 parm->dpl.ippathid = path->pathid;
1275                 parm->dpl.ipflags1 = flags;
1276                 parm->dpl.ipmsgid = msg->id;
1277                 parm->dpl.iptrgcls = msg->class;
1278                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1279         } else {
1280                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1281                 parm->db.ipbfln1f = (u32) size;
1282                 parm->db.ippathid = path->pathid;
1283                 parm->db.ipflags1 = flags;
1284                 parm->db.ipmsgid = msg->id;
1285                 parm->db.iptrgcls = msg->class;
1286         }
1287         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1288 out:
1289         local_bh_enable();
1290         return rc;
1291 }
1292 EXPORT_SYMBOL(iucv_message_reply);
1293
1294 /**
1295  * __iucv_message_send
1296  * @path: address of iucv path structure
1297  * @msg: address of iucv msg structure
1298  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1299  * @srccls: source class of message
1300  * @buffer: address of send buffer or address of struct iucv_array
1301  * @size: length of send buffer
1302  *
1303  * This function transmits data to another application. Data to be
1304  * transmitted is in a buffer and this is a one-way message and the
1305  * receiver will not reply to the message.
1306  *
1307  * Locking:     no locking
1308  *
1309  * Returns the result from the CP IUCV call.
1310  */
1311 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1312                       u8 flags, u32 srccls, void *buffer, size_t size)
1313 {
1314         union iucv_param *parm;
1315         int rc;
1316
1317         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1318                 rc = -EIO;
1319                 goto out;
1320         }
1321         parm = iucv_param[smp_processor_id()];
1322         memset(parm, 0, sizeof(union iucv_param));
1323         if (flags & IUCV_IPRMDATA) {
1324                 /* Message of 8 bytes can be placed into the parameter list. */
1325                 parm->dpl.ippathid = path->pathid;
1326                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1327                 parm->dpl.iptrgcls = msg->class;
1328                 parm->dpl.ipsrccls = srccls;
1329                 parm->dpl.ipmsgtag = msg->tag;
1330                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1331         } else {
1332                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1333                 parm->db.ipbfln1f = (u32) size;
1334                 parm->db.ippathid = path->pathid;
1335                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1336                 parm->db.iptrgcls = msg->class;
1337                 parm->db.ipsrccls = srccls;
1338                 parm->db.ipmsgtag = msg->tag;
1339         }
1340         rc = iucv_call_b2f0(IUCV_SEND, parm);
1341         if (!rc)
1342                 msg->id = parm->db.ipmsgid;
1343 out:
1344         return rc;
1345 }
1346 EXPORT_SYMBOL(__iucv_message_send);
1347
1348 /**
1349  * iucv_message_send
1350  * @path: address of iucv path structure
1351  * @msg: address of iucv msg structure
1352  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1353  * @srccls: source class of message
1354  * @buffer: address of send buffer or address of struct iucv_array
1355  * @size: length of send buffer
1356  *
1357  * This function transmits data to another application. Data to be
1358  * transmitted is in a buffer and this is a one-way message and the
1359  * receiver will not reply to the message.
1360  *
1361  * Locking:     local_bh_enable/local_bh_disable
1362  *
1363  * Returns the result from the CP IUCV call.
1364  */
1365 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1366                       u8 flags, u32 srccls, void *buffer, size_t size)
1367 {
1368         int rc;
1369
1370         local_bh_disable();
1371         rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1372         local_bh_enable();
1373         return rc;
1374 }
1375 EXPORT_SYMBOL(iucv_message_send);
1376
1377 /**
1378  * iucv_message_send2way
1379  * @path: address of iucv path structure
1380  * @msg: address of iucv msg structure
1381  * @flags: how the message is sent and the reply is received
1382  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1383  * @srccls: source class of message
1384  * @buffer: address of send buffer or address of struct iucv_array
1385  * @size: length of send buffer
1386  * @ansbuf: address of answer buffer or address of struct iucv_array
1387  * @asize: size of reply buffer
1388  *
1389  * This function transmits data to another application. Data to be
1390  * transmitted is in a buffer. The receiver of the send is expected to
1391  * reply to the message and a buffer is provided into which IUCV moves
1392  * the reply to this message.
1393  *
1394  * Returns the result from the CP IUCV call.
1395  */
1396 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1397                           u8 flags, u32 srccls, void *buffer, size_t size,
1398                           void *answer, size_t asize, size_t *residual)
1399 {
1400         union iucv_param *parm;
1401         int rc;
1402
1403         local_bh_disable();
1404         if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
1405                 rc = -EIO;
1406                 goto out;
1407         }
1408         parm = iucv_param[smp_processor_id()];
1409         memset(parm, 0, sizeof(union iucv_param));
1410         if (flags & IUCV_IPRMDATA) {
1411                 parm->dpl.ippathid = path->pathid;
1412                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1413                 parm->dpl.iptrgcls = msg->class;
1414                 parm->dpl.ipsrccls = srccls;
1415                 parm->dpl.ipmsgtag = msg->tag;
1416                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1417                 parm->dpl.ipbfln2f = (u32) asize;
1418                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1419         } else {
1420                 parm->db.ippathid = path->pathid;
1421                 parm->db.ipflags1 = path->flags;        /* priority message */
1422                 parm->db.iptrgcls = msg->class;
1423                 parm->db.ipsrccls = srccls;
1424                 parm->db.ipmsgtag = msg->tag;
1425                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1426                 parm->db.ipbfln1f = (u32) size;
1427                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1428                 parm->db.ipbfln2f = (u32) asize;
1429         }
1430         rc = iucv_call_b2f0(IUCV_SEND, parm);
1431         if (!rc)
1432                 msg->id = parm->db.ipmsgid;
1433 out:
1434         local_bh_enable();
1435         return rc;
1436 }
1437 EXPORT_SYMBOL(iucv_message_send2way);
1438
1439 /**
1440  * iucv_path_pending
1441  * @data: Pointer to external interrupt buffer
1442  *
1443  * Process connection pending work item. Called from tasklet while holding
1444  * iucv_table_lock.
1445  */
1446 struct iucv_path_pending {
1447         u16 ippathid;
1448         u8  ipflags1;
1449         u8  iptype;
1450         u16 ipmsglim;
1451         u16 res1;
1452         u8  ipvmid[8];
1453         u8  ipuser[16];
1454         u32 res3;
1455         u8  ippollfg;
1456         u8  res4[3];
1457 } __attribute__ ((packed));
1458
1459 static void iucv_path_pending(struct iucv_irq_data *data)
1460 {
1461         struct iucv_path_pending *ipp = (void *) data;
1462         struct iucv_handler *handler;
1463         struct iucv_path *path;
1464         char *error;
1465
1466         BUG_ON(iucv_path_table[ipp->ippathid]);
1467         /* New pathid, handler found. Create a new path struct. */
1468         error = iucv_error_no_memory;
1469         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1470         if (!path)
1471                 goto out_sever;
1472         path->pathid = ipp->ippathid;
1473         iucv_path_table[path->pathid] = path;
1474         EBCASC(ipp->ipvmid, 8);
1475
1476         /* Call registered handler until one is found that wants the path. */
1477         list_for_each_entry(handler, &iucv_handler_list, list) {
1478                 if (!handler->path_pending)
1479                         continue;
1480                 /*
1481                  * Add path to handler to allow a call to iucv_path_sever
1482                  * inside the path_pending function. If the handler returns
1483                  * an error remove the path from the handler again.
1484                  */
1485                 list_add(&path->list, &handler->paths);
1486                 path->handler = handler;
1487                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1488                         return;
1489                 list_del(&path->list);
1490                 path->handler = NULL;
1491         }
1492         /* No handler wanted the path. */
1493         iucv_path_table[path->pathid] = NULL;
1494         iucv_path_free(path);
1495         error = iucv_error_no_listener;
1496 out_sever:
1497         iucv_sever_pathid(ipp->ippathid, error);
1498 }
1499
1500 /**
1501  * iucv_path_complete
1502  * @data: Pointer to external interrupt buffer
1503  *
1504  * Process connection complete work item. Called from tasklet while holding
1505  * iucv_table_lock.
1506  */
1507 struct iucv_path_complete {
1508         u16 ippathid;
1509         u8  ipflags1;
1510         u8  iptype;
1511         u16 ipmsglim;
1512         u16 res1;
1513         u8  res2[8];
1514         u8  ipuser[16];
1515         u32 res3;
1516         u8  ippollfg;
1517         u8  res4[3];
1518 } __attribute__ ((packed));
1519
1520 static void iucv_path_complete(struct iucv_irq_data *data)
1521 {
1522         struct iucv_path_complete *ipc = (void *) data;
1523         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1524
1525         if (path)
1526                 path->flags = ipc->ipflags1;
1527         if (path && path->handler && path->handler->path_complete)
1528                 path->handler->path_complete(path, ipc->ipuser);
1529 }
1530
1531 /**
1532  * iucv_path_severed
1533  * @data: Pointer to external interrupt buffer
1534  *
1535  * Process connection severed work item. Called from tasklet while holding
1536  * iucv_table_lock.
1537  */
1538 struct iucv_path_severed {
1539         u16 ippathid;
1540         u8  res1;
1541         u8  iptype;
1542         u32 res2;
1543         u8  res3[8];
1544         u8  ipuser[16];
1545         u32 res4;
1546         u8  ippollfg;
1547         u8  res5[3];
1548 } __attribute__ ((packed));
1549
1550 static void iucv_path_severed(struct iucv_irq_data *data)
1551 {
1552         struct iucv_path_severed *ips = (void *) data;
1553         struct iucv_path *path = iucv_path_table[ips->ippathid];
1554
1555         if (!path || !path->handler)    /* Already severed */
1556                 return;
1557         if (path->handler->path_severed)
1558                 path->handler->path_severed(path, ips->ipuser);
1559         else {
1560                 iucv_sever_pathid(path->pathid, NULL);
1561                 iucv_path_table[path->pathid] = NULL;
1562                 list_del(&path->list);
1563                 iucv_path_free(path);
1564         }
1565 }
1566
1567 /**
1568  * iucv_path_quiesced
1569  * @data: Pointer to external interrupt buffer
1570  *
1571  * Process connection quiesced work item. Called from tasklet while holding
1572  * iucv_table_lock.
1573  */
1574 struct iucv_path_quiesced {
1575         u16 ippathid;
1576         u8  res1;
1577         u8  iptype;
1578         u32 res2;
1579         u8  res3[8];
1580         u8  ipuser[16];
1581         u32 res4;
1582         u8  ippollfg;
1583         u8  res5[3];
1584 } __attribute__ ((packed));
1585
1586 static void iucv_path_quiesced(struct iucv_irq_data *data)
1587 {
1588         struct iucv_path_quiesced *ipq = (void *) data;
1589         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1590
1591         if (path && path->handler && path->handler->path_quiesced)
1592                 path->handler->path_quiesced(path, ipq->ipuser);
1593 }
1594
1595 /**
1596  * iucv_path_resumed
1597  * @data: Pointer to external interrupt buffer
1598  *
1599  * Process connection resumed work item. Called from tasklet while holding
1600  * iucv_table_lock.
1601  */
1602 struct iucv_path_resumed {
1603         u16 ippathid;
1604         u8  res1;
1605         u8  iptype;
1606         u32 res2;
1607         u8  res3[8];
1608         u8  ipuser[16];
1609         u32 res4;
1610         u8  ippollfg;
1611         u8  res5[3];
1612 } __attribute__ ((packed));
1613
1614 static void iucv_path_resumed(struct iucv_irq_data *data)
1615 {
1616         struct iucv_path_resumed *ipr = (void *) data;
1617         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1618
1619         if (path && path->handler && path->handler->path_resumed)
1620                 path->handler->path_resumed(path, ipr->ipuser);
1621 }
1622
1623 /**
1624  * iucv_message_complete
1625  * @data: Pointer to external interrupt buffer
1626  *
1627  * Process message complete work item. Called from tasklet while holding
1628  * iucv_table_lock.
1629  */
1630 struct iucv_message_complete {
1631         u16 ippathid;
1632         u8  ipflags1;
1633         u8  iptype;
1634         u32 ipmsgid;
1635         u32 ipaudit;
1636         u8  iprmmsg[8];
1637         u32 ipsrccls;
1638         u32 ipmsgtag;
1639         u32 res;
1640         u32 ipbfln2f;
1641         u8  ippollfg;
1642         u8  res2[3];
1643 } __attribute__ ((packed));
1644
1645 static void iucv_message_complete(struct iucv_irq_data *data)
1646 {
1647         struct iucv_message_complete *imc = (void *) data;
1648         struct iucv_path *path = iucv_path_table[imc->ippathid];
1649         struct iucv_message msg;
1650
1651         if (path && path->handler && path->handler->message_complete) {
1652                 msg.flags = imc->ipflags1;
1653                 msg.id = imc->ipmsgid;
1654                 msg.audit = imc->ipaudit;
1655                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1656                 msg.class = imc->ipsrccls;
1657                 msg.tag = imc->ipmsgtag;
1658                 msg.length = imc->ipbfln2f;
1659                 path->handler->message_complete(path, &msg);
1660         }
1661 }
1662
1663 /**
1664  * iucv_message_pending
1665  * @data: Pointer to external interrupt buffer
1666  *
1667  * Process message pending work item. Called from tasklet while holding
1668  * iucv_table_lock.
1669  */
1670 struct iucv_message_pending {
1671         u16 ippathid;
1672         u8  ipflags1;
1673         u8  iptype;
1674         u32 ipmsgid;
1675         u32 iptrgcls;
1676         union {
1677                 u32 iprmmsg1_u32;
1678                 u8  iprmmsg1[4];
1679         } ln1msg1;
1680         union {
1681                 u32 ipbfln1f;
1682                 u8  iprmmsg2[4];
1683         } ln1msg2;
1684         u32 res1[3];
1685         u32 ipbfln2f;
1686         u8  ippollfg;
1687         u8  res2[3];
1688 } __attribute__ ((packed));
1689
1690 static void iucv_message_pending(struct iucv_irq_data *data)
1691 {
1692         struct iucv_message_pending *imp = (void *) data;
1693         struct iucv_path *path = iucv_path_table[imp->ippathid];
1694         struct iucv_message msg;
1695
1696         if (path && path->handler && path->handler->message_pending) {
1697                 msg.flags = imp->ipflags1;
1698                 msg.id = imp->ipmsgid;
1699                 msg.class = imp->iptrgcls;
1700                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1701                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1702                         msg.length = 8;
1703                 } else
1704                         msg.length = imp->ln1msg2.ipbfln1f;
1705                 msg.reply_size = imp->ipbfln2f;
1706                 path->handler->message_pending(path, &msg);
1707         }
1708 }
1709
1710 /**
1711  * iucv_tasklet_fn:
1712  *
1713  * This tasklet loops over the queue of irq buffers created by
1714  * iucv_external_interrupt, calls the appropriate action handler
1715  * and then frees the buffer.
1716  */
1717 static void iucv_tasklet_fn(unsigned long ignored)
1718 {
1719         typedef void iucv_irq_fn(struct iucv_irq_data *);
1720         static iucv_irq_fn *irq_fn[] = {
1721                 [0x02] = iucv_path_complete,
1722                 [0x03] = iucv_path_severed,
1723                 [0x04] = iucv_path_quiesced,
1724                 [0x05] = iucv_path_resumed,
1725                 [0x06] = iucv_message_complete,
1726                 [0x07] = iucv_message_complete,
1727                 [0x08] = iucv_message_pending,
1728                 [0x09] = iucv_message_pending,
1729         };
1730         LIST_HEAD(task_queue);
1731         struct iucv_irq_list *p, *n;
1732
1733         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1734         if (!spin_trylock(&iucv_table_lock)) {
1735                 tasklet_schedule(&iucv_tasklet);
1736                 return;
1737         }
1738         iucv_active_cpu = smp_processor_id();
1739
1740         spin_lock_irq(&iucv_queue_lock);
1741         list_splice_init(&iucv_task_queue, &task_queue);
1742         spin_unlock_irq(&iucv_queue_lock);
1743
1744         list_for_each_entry_safe(p, n, &task_queue, list) {
1745                 list_del_init(&p->list);
1746                 irq_fn[p->data.iptype](&p->data);
1747                 kfree(p);
1748         }
1749
1750         iucv_active_cpu = -1;
1751         spin_unlock(&iucv_table_lock);
1752 }
1753
1754 /**
1755  * iucv_work_fn:
1756  *
1757  * This work function loops over the queue of path pending irq blocks
1758  * created by iucv_external_interrupt, calls the appropriate action
1759  * handler and then frees the buffer.
1760  */
1761 static void iucv_work_fn(struct work_struct *work)
1762 {
1763         typedef void iucv_irq_fn(struct iucv_irq_data *);
1764         LIST_HEAD(work_queue);
1765         struct iucv_irq_list *p, *n;
1766
1767         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1768         spin_lock_bh(&iucv_table_lock);
1769         iucv_active_cpu = smp_processor_id();
1770
1771         spin_lock_irq(&iucv_queue_lock);
1772         list_splice_init(&iucv_work_queue, &work_queue);
1773         spin_unlock_irq(&iucv_queue_lock);
1774
1775         iucv_cleanup_queue();
1776         list_for_each_entry_safe(p, n, &work_queue, list) {
1777                 list_del_init(&p->list);
1778                 iucv_path_pending(&p->data);
1779                 kfree(p);
1780         }
1781
1782         iucv_active_cpu = -1;
1783         spin_unlock_bh(&iucv_table_lock);
1784 }
1785
1786 /**
1787  * iucv_external_interrupt
1788  * @code: irq code
1789  *
1790  * Handles external interrupts coming in from CP.
1791  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1792  */
1793 static void iucv_external_interrupt(u16 code)
1794 {
1795         struct iucv_irq_data *p;
1796         struct iucv_irq_list *work;
1797
1798         p = iucv_irq_data[smp_processor_id()];
1799         if (p->ippathid >= iucv_max_pathid) {
1800                 WARN_ON(p->ippathid >= iucv_max_pathid);
1801                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1802                 return;
1803         }
1804         BUG_ON(p->iptype  < 0x01 || p->iptype > 0x09);
1805         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1806         if (!work) {
1807                 pr_warning("iucv_external_interrupt: out of memory\n");
1808                 return;
1809         }
1810         memcpy(&work->data, p, sizeof(work->data));
1811         spin_lock(&iucv_queue_lock);
1812         if (p->iptype == 0x01) {
1813                 /* Path pending interrupt. */
1814                 list_add_tail(&work->list, &iucv_work_queue);
1815                 schedule_work(&iucv_work);
1816         } else {
1817                 /* The other interrupts. */
1818                 list_add_tail(&work->list, &iucv_task_queue);
1819                 tasklet_schedule(&iucv_tasklet);
1820         }
1821         spin_unlock(&iucv_queue_lock);
1822 }
1823
1824 static int iucv_pm_prepare(struct device *dev)
1825 {
1826         int rc = 0;
1827
1828 #ifdef CONFIG_PM_DEBUG
1829         printk(KERN_INFO "iucv_pm_prepare\n");
1830 #endif
1831         if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1832                 rc = dev->driver->pm->prepare(dev);
1833         return rc;
1834 }
1835
1836 static void iucv_pm_complete(struct device *dev)
1837 {
1838 #ifdef CONFIG_PM_DEBUG
1839         printk(KERN_INFO "iucv_pm_complete\n");
1840 #endif
1841         if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1842                 dev->driver->pm->complete(dev);
1843 }
1844
1845 /**
1846  * iucv_path_table_empty() - determine if iucv path table is empty
1847  *
1848  * Returns 0 if there are still iucv pathes defined
1849  *         1 if there are no iucv pathes defined
1850  */
1851 int iucv_path_table_empty(void)
1852 {
1853         int i;
1854
1855         for (i = 0; i < iucv_max_pathid; i++) {
1856                 if (iucv_path_table[i])
1857                         return 0;
1858         }
1859         return 1;
1860 }
1861
1862 /**
1863  * iucv_pm_freeze() - Freeze PM callback
1864  * @dev:        iucv-based device
1865  *
1866  * disable iucv interrupts
1867  * invoke callback function of the iucv-based driver
1868  * shut down iucv, if no iucv-pathes are established anymore
1869  */
1870 static int iucv_pm_freeze(struct device *dev)
1871 {
1872         int cpu;
1873         int rc = 0;
1874
1875 #ifdef CONFIG_PM_DEBUG
1876         printk(KERN_WARNING "iucv_pm_freeze\n");
1877 #endif
1878         for_each_cpu_mask_nr(cpu, iucv_irq_cpumask)
1879                 smp_call_function_single(cpu, iucv_block_cpu_almost, NULL, 1);
1880         if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1881                 rc = dev->driver->pm->freeze(dev);
1882         if (iucv_path_table_empty())
1883                 iucv_disable();
1884         return rc;
1885 }
1886
1887 /**
1888  * iucv_pm_thaw() - Thaw PM callback
1889  * @dev:        iucv-based device
1890  *
1891  * make iucv ready for use again: allocate path table, declare interrupt buffers
1892  *                                and enable iucv interrupts
1893  * invoke callback function of the iucv-based driver
1894  */
1895 static int iucv_pm_thaw(struct device *dev)
1896 {
1897         int rc = 0;
1898
1899 #ifdef CONFIG_PM_DEBUG
1900         printk(KERN_WARNING "iucv_pm_thaw\n");
1901 #endif
1902         if (!iucv_path_table) {
1903                 rc = iucv_enable();
1904                 if (rc)
1905                         goto out;
1906         }
1907         if (cpus_empty(iucv_irq_cpumask)) {
1908                 if (iucv_nonsmp_handler)
1909                         /* enable interrupts on one cpu */
1910                         iucv_allow_cpu(NULL);
1911                 else
1912                         /* enable interrupts on all cpus */
1913                         iucv_setmask_mp();
1914         }
1915         if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1916                 rc = dev->driver->pm->thaw(dev);
1917 out:
1918         return rc;
1919 }
1920
1921 /**
1922  * iucv_pm_restore() - Restore PM callback
1923  * @dev:        iucv-based device
1924  *
1925  * make iucv ready for use again: allocate path table, declare interrupt buffers
1926  *                                and enable iucv interrupts
1927  * invoke callback function of the iucv-based driver
1928  */
1929 static int iucv_pm_restore(struct device *dev)
1930 {
1931         int rc = 0;
1932
1933 #ifdef CONFIG_PM_DEBUG
1934         printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1935 #endif
1936         if (cpus_empty(iucv_irq_cpumask)) {
1937                 rc = iucv_query_maxconn();
1938                 rc = iucv_enable();
1939                 if (rc)
1940                         goto out;
1941         }
1942         if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1943                 rc = dev->driver->pm->restore(dev);
1944 out:
1945         return rc;
1946 }
1947
1948 /**
1949  * iucv_init
1950  *
1951  * Allocates and initializes various data structures.
1952  */
1953 static int __init iucv_init(void)
1954 {
1955         int rc;
1956         int cpu;
1957
1958         if (!MACHINE_IS_VM) {
1959                 rc = -EPROTONOSUPPORT;
1960                 goto out;
1961         }
1962         rc = iucv_query_maxconn();
1963         if (rc)
1964                 goto out;
1965         rc = register_external_interrupt(0x4000, iucv_external_interrupt);
1966         if (rc)
1967                 goto out;
1968         iucv_root = root_device_register("iucv");
1969         if (IS_ERR(iucv_root)) {
1970                 rc = PTR_ERR(iucv_root);
1971                 goto out_int;
1972         }
1973
1974         for_each_online_cpu(cpu) {
1975                 /* Note: GFP_DMA used to get memory below 2G */
1976                 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1977                                      GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1978                 if (!iucv_irq_data[cpu]) {
1979                         rc = -ENOMEM;
1980                         goto out_free;
1981                 }
1982
1983                 /* Allocate parameter blocks. */
1984                 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1985                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1986                 if (!iucv_param[cpu]) {
1987                         rc = -ENOMEM;
1988                         goto out_free;
1989                 }
1990                 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
1991                                   GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1992                 if (!iucv_param_irq[cpu]) {
1993                         rc = -ENOMEM;
1994                         goto out_free;
1995                 }
1996
1997         }
1998         rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1999         if (rc)
2000                 goto out_free;
2001         rc = register_reboot_notifier(&iucv_reboot_notifier);
2002         if (rc)
2003                 goto out_cpu;
2004         ASCEBC(iucv_error_no_listener, 16);
2005         ASCEBC(iucv_error_no_memory, 16);
2006         ASCEBC(iucv_error_pathid, 16);
2007         iucv_available = 1;
2008         rc = bus_register(&iucv_bus);
2009         if (rc)
2010                 goto out_reboot;
2011         return 0;
2012
2013 out_reboot:
2014         unregister_reboot_notifier(&iucv_reboot_notifier);
2015 out_cpu:
2016         unregister_hotcpu_notifier(&iucv_cpu_notifier);
2017 out_free:
2018         for_each_possible_cpu(cpu) {
2019                 kfree(iucv_param_irq[cpu]);
2020                 iucv_param_irq[cpu] = NULL;
2021                 kfree(iucv_param[cpu]);
2022                 iucv_param[cpu] = NULL;
2023                 kfree(iucv_irq_data[cpu]);
2024                 iucv_irq_data[cpu] = NULL;
2025         }
2026         root_device_unregister(iucv_root);
2027 out_int:
2028         unregister_external_interrupt(0x4000, iucv_external_interrupt);
2029 out:
2030         return rc;
2031 }
2032
2033 /**
2034  * iucv_exit
2035  *
2036  * Frees everything allocated from iucv_init.
2037  */
2038 static void __exit iucv_exit(void)
2039 {
2040         struct iucv_irq_list *p, *n;
2041         int cpu;
2042
2043         spin_lock_irq(&iucv_queue_lock);
2044         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2045                 kfree(p);
2046         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2047                 kfree(p);
2048         spin_unlock_irq(&iucv_queue_lock);
2049         unregister_reboot_notifier(&iucv_reboot_notifier);
2050         unregister_hotcpu_notifier(&iucv_cpu_notifier);
2051         for_each_possible_cpu(cpu) {
2052                 kfree(iucv_param_irq[cpu]);
2053                 iucv_param_irq[cpu] = NULL;
2054                 kfree(iucv_param[cpu]);
2055                 iucv_param[cpu] = NULL;
2056                 kfree(iucv_irq_data[cpu]);
2057                 iucv_irq_data[cpu] = NULL;
2058         }
2059         root_device_unregister(iucv_root);
2060         bus_unregister(&iucv_bus);
2061         unregister_external_interrupt(0x4000, iucv_external_interrupt);
2062 }
2063
2064 subsys_initcall(iucv_init);
2065 module_exit(iucv_exit);
2066
2067 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2068 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2069 MODULE_LICENSE("GPL");