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Linux/net/iucv/iucv.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * IUCV base infrastructure.
  4  *
  5  * Copyright IBM Corp. 2001, 2009
  6  *
  7  * Author(s):
  8  *    Original source:
  9  *      Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
 10  *      Xenia Tkatschow (xenia@us.ibm.com)
 11  *    2Gb awareness and general cleanup:
 12  *      Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
 13  *    Rewritten for af_iucv:
 14  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
 15  *    PM functions:
 16  *      Ursula Braun (ursula.braun@de.ibm.com)
 17  *
 18  * Documentation used:
 19  *    The original source
 20  *    CP Programming Service, IBM document # SC24-5760
 21  */
 22 
 23 #define KMSG_COMPONENT "iucv"
 24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 25 
 26 #include <linux/kernel_stat.h>
 27 #include <linux/module.h>
 28 #include <linux/moduleparam.h>
 29 #include <linux/spinlock.h>
 30 #include <linux/kernel.h>
 31 #include <linux/slab.h>
 32 #include <linux/init.h>
 33 #include <linux/interrupt.h>
 34 #include <linux/list.h>
 35 #include <linux/errno.h>
 36 #include <linux/err.h>
 37 #include <linux/device.h>
 38 #include <linux/cpu.h>
 39 #include <linux/reboot.h>
 40 #include <net/iucv/iucv.h>
 41 #include <linux/atomic.h>
 42 #include <asm/ebcdic.h>
 43 #include <asm/io.h>
 44 #include <asm/irq.h>
 45 #include <asm/smp.h>
 46 
 47 /*
 48  * FLAGS:
 49  * All flags are defined in the field IPFLAGS1 of each function
 50  * and can be found in CP Programming Services.
 51  * IPSRCCLS - Indicates you have specified a source class.
 52  * IPTRGCLS - Indicates you have specified a target class.
 53  * IPFGPID  - Indicates you have specified a pathid.
 54  * IPFGMID  - Indicates you have specified a message ID.
 55  * IPNORPY  - Indicates a one-way message. No reply expected.
 56  * IPALL    - Indicates that all paths are affected.
 57  */
 58 #define IUCV_IPSRCCLS   0x01
 59 #define IUCV_IPTRGCLS   0x01
 60 #define IUCV_IPFGPID    0x02
 61 #define IUCV_IPFGMID    0x04
 62 #define IUCV_IPNORPY    0x10
 63 #define IUCV_IPALL      0x80
 64 
 65 static int iucv_bus_match(struct device *dev, struct device_driver *drv)
 66 {
 67         return 0;
 68 }
 69 
 70 enum iucv_pm_states {
 71         IUCV_PM_INITIAL = 0,
 72         IUCV_PM_FREEZING = 1,
 73         IUCV_PM_THAWING = 2,
 74         IUCV_PM_RESTORING = 3,
 75 };
 76 static enum iucv_pm_states iucv_pm_state;
 77 
 78 static int iucv_pm_prepare(struct device *);
 79 static void iucv_pm_complete(struct device *);
 80 static int iucv_pm_freeze(struct device *);
 81 static int iucv_pm_thaw(struct device *);
 82 static int iucv_pm_restore(struct device *);
 83 
 84 static const struct dev_pm_ops iucv_pm_ops = {
 85         .prepare = iucv_pm_prepare,
 86         .complete = iucv_pm_complete,
 87         .freeze = iucv_pm_freeze,
 88         .thaw = iucv_pm_thaw,
 89         .restore = iucv_pm_restore,
 90 };
 91 
 92 struct bus_type iucv_bus = {
 93         .name = "iucv",
 94         .match = iucv_bus_match,
 95         .pm = &iucv_pm_ops,
 96 };
 97 EXPORT_SYMBOL(iucv_bus);
 98 
 99 struct device *iucv_root;
100 EXPORT_SYMBOL(iucv_root);
101 
102 static int iucv_available;
103 
104 /* General IUCV interrupt structure */
105 struct iucv_irq_data {
106         u16 ippathid;
107         u8  ipflags1;
108         u8  iptype;
109         u32 res2[8];
110 };
111 
112 struct iucv_irq_list {
113         struct list_head list;
114         struct iucv_irq_data data;
115 };
116 
117 static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
118 static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
119 static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
120 
121 /*
122  * Queue of interrupt buffers lock for delivery via the tasklet
123  * (fast but can't call smp_call_function).
124  */
125 static LIST_HEAD(iucv_task_queue);
126 
127 /*
128  * The tasklet for fast delivery of iucv interrupts.
129  */
130 static void iucv_tasklet_fn(unsigned long);
131 static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
132 
133 /*
134  * Queue of interrupt buffers for delivery via a work queue
135  * (slower but can call smp_call_function).
136  */
137 static LIST_HEAD(iucv_work_queue);
138 
139 /*
140  * The work element to deliver path pending interrupts.
141  */
142 static void iucv_work_fn(struct work_struct *work);
143 static DECLARE_WORK(iucv_work, iucv_work_fn);
144 
145 /*
146  * Spinlock protecting task and work queue.
147  */
148 static DEFINE_SPINLOCK(iucv_queue_lock);
149 
150 enum iucv_command_codes {
151         IUCV_QUERY = 0,
152         IUCV_RETRIEVE_BUFFER = 2,
153         IUCV_SEND = 4,
154         IUCV_RECEIVE = 5,
155         IUCV_REPLY = 6,
156         IUCV_REJECT = 8,
157         IUCV_PURGE = 9,
158         IUCV_ACCEPT = 10,
159         IUCV_CONNECT = 11,
160         IUCV_DECLARE_BUFFER = 12,
161         IUCV_QUIESCE = 13,
162         IUCV_RESUME = 14,
163         IUCV_SEVER = 15,
164         IUCV_SETMASK = 16,
165         IUCV_SETCONTROLMASK = 17,
166 };
167 
168 /*
169  * Error messages that are used with the iucv_sever function. They get
170  * converted to EBCDIC.
171  */
172 static char iucv_error_no_listener[16] = "NO LISTENER";
173 static char iucv_error_no_memory[16] = "NO MEMORY";
174 static char iucv_error_pathid[16] = "INVALID PATHID";
175 
176 /*
177  * iucv_handler_list: List of registered handlers.
178  */
179 static LIST_HEAD(iucv_handler_list);
180 
181 /*
182  * iucv_path_table: an array of iucv_path structures.
183  */
184 static struct iucv_path **iucv_path_table;
185 static unsigned long iucv_max_pathid;
186 
187 /*
188  * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
189  */
190 static DEFINE_SPINLOCK(iucv_table_lock);
191 
192 /*
193  * iucv_active_cpu: contains the number of the cpu executing the tasklet
194  * or the work handler. Needed for iucv_path_sever called from tasklet.
195  */
196 static int iucv_active_cpu = -1;
197 
198 /*
199  * Mutex and wait queue for iucv_register/iucv_unregister.
200  */
201 static DEFINE_MUTEX(iucv_register_mutex);
202 
203 /*
204  * Counter for number of non-smp capable handlers.
205  */
206 static int iucv_nonsmp_handler;
207 
208 /*
209  * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
210  * iucv_path_quiesce and iucv_path_sever.
211  */
212 struct iucv_cmd_control {
213         u16 ippathid;
214         u8  ipflags1;
215         u8  iprcode;
216         u16 ipmsglim;
217         u16 res1;
218         u8  ipvmid[8];
219         u8  ipuser[16];
220         u8  iptarget[8];
221 } __attribute__ ((packed,aligned(8)));
222 
223 /*
224  * Data in parameter list iucv structure. Used by iucv_message_send,
225  * iucv_message_send2way and iucv_message_reply.
226  */
227 struct iucv_cmd_dpl {
228         u16 ippathid;
229         u8  ipflags1;
230         u8  iprcode;
231         u32 ipmsgid;
232         u32 iptrgcls;
233         u8  iprmmsg[8];
234         u32 ipsrccls;
235         u32 ipmsgtag;
236         u32 ipbfadr2;
237         u32 ipbfln2f;
238         u32 res;
239 } __attribute__ ((packed,aligned(8)));
240 
241 /*
242  * Data in buffer iucv structure. Used by iucv_message_receive,
243  * iucv_message_reject, iucv_message_send, iucv_message_send2way
244  * and iucv_declare_cpu.
245  */
246 struct iucv_cmd_db {
247         u16 ippathid;
248         u8  ipflags1;
249         u8  iprcode;
250         u32 ipmsgid;
251         u32 iptrgcls;
252         u32 ipbfadr1;
253         u32 ipbfln1f;
254         u32 ipsrccls;
255         u32 ipmsgtag;
256         u32 ipbfadr2;
257         u32 ipbfln2f;
258         u32 res;
259 } __attribute__ ((packed,aligned(8)));
260 
261 /*
262  * Purge message iucv structure. Used by iucv_message_purge.
263  */
264 struct iucv_cmd_purge {
265         u16 ippathid;
266         u8  ipflags1;
267         u8  iprcode;
268         u32 ipmsgid;
269         u8  ipaudit[3];
270         u8  res1[5];
271         u32 res2;
272         u32 ipsrccls;
273         u32 ipmsgtag;
274         u32 res3[3];
275 } __attribute__ ((packed,aligned(8)));
276 
277 /*
278  * Set mask iucv structure. Used by iucv_enable_cpu.
279  */
280 struct iucv_cmd_set_mask {
281         u8  ipmask;
282         u8  res1[2];
283         u8  iprcode;
284         u32 res2[9];
285 } __attribute__ ((packed,aligned(8)));
286 
287 union iucv_param {
288         struct iucv_cmd_control ctrl;
289         struct iucv_cmd_dpl dpl;
290         struct iucv_cmd_db db;
291         struct iucv_cmd_purge purge;
292         struct iucv_cmd_set_mask set_mask;
293 };
294 
295 /*
296  * Anchor for per-cpu IUCV command parameter block.
297  */
298 static union iucv_param *iucv_param[NR_CPUS];
299 static union iucv_param *iucv_param_irq[NR_CPUS];
300 
301 /**
302  * iucv_call_b2f0
303  * @code: identifier of IUCV call to CP.
304  * @parm: pointer to a struct iucv_parm block
305  *
306  * Calls CP to execute IUCV commands.
307  *
308  * Returns the result of the CP IUCV call.
309  */
310 static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
311 {
312         register unsigned long reg0 asm ("");
313         register unsigned long reg1 asm ("1");
314         int ccode;
315 
316         reg0 = command;
317         reg1 = (unsigned long)parm;
318         asm volatile(
319                 "       .long 0xb2f01000\n"
320                 "       ipm     %0\n"
321                 "       srl     %0,28\n"
322                 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
323                 :  "m" (*parm) : "cc");
324         return ccode;
325 }
326 
327 static inline int iucv_call_b2f0(int command, union iucv_param *parm)
328 {
329         int ccode;
330 
331         ccode = __iucv_call_b2f0(command, parm);
332         return ccode == 1 ? parm->ctrl.iprcode : ccode;
333 }
334 
335 /**
336  * iucv_query_maxconn
337  *
338  * Determines the maximum number of connections that may be established.
339  *
340  * Returns the maximum number of connections or -EPERM is IUCV is not
341  * available.
342  */
343 static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
344 {
345         register unsigned long reg0 asm ("");
346         register unsigned long reg1 asm ("1");
347         int ccode;
348 
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         *max_pathid = reg1;
357         return ccode;
358 }
359 
360 static int iucv_query_maxconn(void)
361 {
362         unsigned long max_pathid;
363         void *param;
364         int ccode;
365 
366         param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
367         if (!param)
368                 return -ENOMEM;
369         ccode = __iucv_query_maxconn(param, &max_pathid);
370         if (ccode == 0)
371                 iucv_max_pathid = max_pathid;
372         kfree(param);
373         return ccode ? -EPERM : 0;
374 }
375 
376 /**
377  * iucv_allow_cpu
378  * @data: unused
379  *
380  * Allow iucv interrupts on this cpu.
381  */
382 static void iucv_allow_cpu(void *data)
383 {
384         int cpu = smp_processor_id();
385         union iucv_param *parm;
386 
387         /*
388          * Enable all iucv interrupts.
389          * ipmask contains bits for the different interrupts
390          *      0x80 - Flag to allow nonpriority message pending interrupts
391          *      0x40 - Flag to allow priority message pending interrupts
392          *      0x20 - Flag to allow nonpriority message completion interrupts
393          *      0x10 - Flag to allow priority message completion interrupts
394          *      0x08 - Flag to allow IUCV control interrupts
395          */
396         parm = iucv_param_irq[cpu];
397         memset(parm, 0, sizeof(union iucv_param));
398         parm->set_mask.ipmask = 0xf8;
399         iucv_call_b2f0(IUCV_SETMASK, parm);
400 
401         /*
402          * Enable all iucv control interrupts.
403          * ipmask contains bits for the different interrupts
404          *      0x80 - Flag to allow pending connections interrupts
405          *      0x40 - Flag to allow connection complete interrupts
406          *      0x20 - Flag to allow connection severed interrupts
407          *      0x10 - Flag to allow connection quiesced interrupts
408          *      0x08 - Flag to allow connection resumed interrupts
409          */
410         memset(parm, 0, sizeof(union iucv_param));
411         parm->set_mask.ipmask = 0xf8;
412         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
413         /* Set indication that iucv interrupts are allowed for this cpu. */
414         cpumask_set_cpu(cpu, &iucv_irq_cpumask);
415 }
416 
417 /**
418  * iucv_block_cpu
419  * @data: unused
420  *
421  * Block iucv interrupts on this cpu.
422  */
423 static void iucv_block_cpu(void *data)
424 {
425         int cpu = smp_processor_id();
426         union iucv_param *parm;
427 
428         /* Disable all iucv interrupts. */
429         parm = iucv_param_irq[cpu];
430         memset(parm, 0, sizeof(union iucv_param));
431         iucv_call_b2f0(IUCV_SETMASK, parm);
432 
433         /* Clear indication that iucv interrupts are allowed for this cpu. */
434         cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
435 }
436 
437 /**
438  * iucv_block_cpu_almost
439  * @data: unused
440  *
441  * Allow connection-severed interrupts only on this cpu.
442  */
443 static void iucv_block_cpu_almost(void *data)
444 {
445         int cpu = smp_processor_id();
446         union iucv_param *parm;
447 
448         /* Allow iucv control interrupts only */
449         parm = iucv_param_irq[cpu];
450         memset(parm, 0, sizeof(union iucv_param));
451         parm->set_mask.ipmask = 0x08;
452         iucv_call_b2f0(IUCV_SETMASK, parm);
453         /* Allow iucv-severed interrupt only */
454         memset(parm, 0, sizeof(union iucv_param));
455         parm->set_mask.ipmask = 0x20;
456         iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
457 
458         /* Clear indication that iucv interrupts are allowed for this cpu. */
459         cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
460 }
461 
462 /**
463  * iucv_declare_cpu
464  * @data: unused
465  *
466  * Declare a interrupt buffer on this cpu.
467  */
468 static void iucv_declare_cpu(void *data)
469 {
470         int cpu = smp_processor_id();
471         union iucv_param *parm;
472         int rc;
473 
474         if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
475                 return;
476 
477         /* Declare interrupt buffer. */
478         parm = iucv_param_irq[cpu];
479         memset(parm, 0, sizeof(union iucv_param));
480         parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
481         rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
482         if (rc) {
483                 char *err = "Unknown";
484                 switch (rc) {
485                 case 0x03:
486                         err = "Directory error";
487                         break;
488                 case 0x0a:
489                         err = "Invalid length";
490                         break;
491                 case 0x13:
492                         err = "Buffer already exists";
493                         break;
494                 case 0x3e:
495                         err = "Buffer overlap";
496                         break;
497                 case 0x5c:
498                         err = "Paging or storage error";
499                         break;
500                 }
501                 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
502                         cpu, rc, err);
503                 return;
504         }
505 
506         /* Set indication that an iucv buffer exists for this cpu. */
507         cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
508 
509         if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
510                 /* Enable iucv interrupts on this cpu. */
511                 iucv_allow_cpu(NULL);
512         else
513                 /* Disable iucv interrupts on this cpu. */
514                 iucv_block_cpu(NULL);
515 }
516 
517 /**
518  * iucv_retrieve_cpu
519  * @data: unused
520  *
521  * Retrieve interrupt buffer on this cpu.
522  */
523 static void iucv_retrieve_cpu(void *data)
524 {
525         int cpu = smp_processor_id();
526         union iucv_param *parm;
527 
528         if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
529                 return;
530 
531         /* Block iucv interrupts. */
532         iucv_block_cpu(NULL);
533 
534         /* Retrieve interrupt buffer. */
535         parm = iucv_param_irq[cpu];
536         iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
537 
538         /* Clear indication that an iucv buffer exists for this cpu. */
539         cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
540 }
541 
542 /**
543  * iucv_setmask_smp
544  *
545  * Allow iucv interrupts on all cpus.
546  */
547 static void iucv_setmask_mp(void)
548 {
549         int cpu;
550 
551         get_online_cpus();
552         for_each_online_cpu(cpu)
553                 /* Enable all cpus with a declared buffer. */
554                 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
555                     !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
556                         smp_call_function_single(cpu, iucv_allow_cpu,
557                                                  NULL, 1);
558         put_online_cpus();
559 }
560 
561 /**
562  * iucv_setmask_up
563  *
564  * Allow iucv interrupts on a single cpu.
565  */
566 static void iucv_setmask_up(void)
567 {
568         cpumask_t cpumask;
569         int cpu;
570 
571         /* Disable all cpu but the first in cpu_irq_cpumask. */
572         cpumask_copy(&cpumask, &iucv_irq_cpumask);
573         cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
574         for_each_cpu(cpu, &cpumask)
575                 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
576 }
577 
578 /**
579  * iucv_enable
580  *
581  * This function makes iucv ready for use. It allocates the pathid
582  * table, declares an iucv interrupt buffer and enables the iucv
583  * interrupts. Called when the first user has registered an iucv
584  * handler.
585  */
586 static int iucv_enable(void)
587 {
588         size_t alloc_size;
589         int cpu, rc;
590 
591         get_online_cpus();
592         rc = -ENOMEM;
593         alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
594         iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
595         if (!iucv_path_table)
596                 goto out;
597         /* Declare per cpu buffers. */
598         rc = -EIO;
599         for_each_online_cpu(cpu)
600                 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
601         if (cpumask_empty(&iucv_buffer_cpumask))
602                 /* No cpu could declare an iucv buffer. */
603                 goto out;
604         put_online_cpus();
605         return 0;
606 out:
607         kfree(iucv_path_table);
608         iucv_path_table = NULL;
609         put_online_cpus();
610         return rc;
611 }
612 
613 /**
614  * iucv_disable
615  *
616  * This function shuts down iucv. It disables iucv interrupts, retrieves
617  * the iucv interrupt buffer and frees the pathid table. Called after the
618  * last user unregister its iucv handler.
619  */
620 static void iucv_disable(void)
621 {
622         get_online_cpus();
623         on_each_cpu(iucv_retrieve_cpu, NULL, 1);
624         kfree(iucv_path_table);
625         iucv_path_table = NULL;
626         put_online_cpus();
627 }
628 
629 static int iucv_cpu_dead(unsigned int cpu)
630 {
631         kfree(iucv_param_irq[cpu]);
632         iucv_param_irq[cpu] = NULL;
633         kfree(iucv_param[cpu]);
634         iucv_param[cpu] = NULL;
635         kfree(iucv_irq_data[cpu]);
636         iucv_irq_data[cpu] = NULL;
637         return 0;
638 }
639 
640 static int iucv_cpu_prepare(unsigned int cpu)
641 {
642         /* Note: GFP_DMA used to get memory below 2G */
643         iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
644                              GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
645         if (!iucv_irq_data[cpu])
646                 goto out_free;
647 
648         /* Allocate parameter blocks. */
649         iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
650                           GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
651         if (!iucv_param[cpu])
652                 goto out_free;
653 
654         iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
655                           GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
656         if (!iucv_param_irq[cpu])
657                 goto out_free;
658 
659         return 0;
660 
661 out_free:
662         iucv_cpu_dead(cpu);
663         return -ENOMEM;
664 }
665 
666 static int iucv_cpu_online(unsigned int cpu)
667 {
668         if (!iucv_path_table)
669                 return 0;
670         iucv_declare_cpu(NULL);
671         return 0;
672 }
673 
674 static int iucv_cpu_down_prep(unsigned int cpu)
675 {
676         cpumask_t cpumask;
677 
678         if (!iucv_path_table)
679                 return 0;
680 
681         cpumask_copy(&cpumask, &iucv_buffer_cpumask);
682         cpumask_clear_cpu(cpu, &cpumask);
683         if (cpumask_empty(&cpumask))
684                 /* Can't offline last IUCV enabled cpu. */
685                 return -EINVAL;
686 
687         iucv_retrieve_cpu(NULL);
688         if (!cpumask_empty(&iucv_irq_cpumask))
689                 return 0;
690         smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
691                                  iucv_allow_cpu, NULL, 1);
692         return 0;
693 }
694 
695 /**
696  * iucv_sever_pathid
697  * @pathid: path identification number.
698  * @userdata: 16-bytes of user data.
699  *
700  * Sever an iucv path to free up the pathid. Used internally.
701  */
702 static int iucv_sever_pathid(u16 pathid, u8 *userdata)
703 {
704         union iucv_param *parm;
705 
706         parm = iucv_param_irq[smp_processor_id()];
707         memset(parm, 0, sizeof(union iucv_param));
708         if (userdata)
709                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
710         parm->ctrl.ippathid = pathid;
711         return iucv_call_b2f0(IUCV_SEVER, parm);
712 }
713 
714 /**
715  * __iucv_cleanup_queue
716  * @dummy: unused dummy argument
717  *
718  * Nop function called via smp_call_function to force work items from
719  * pending external iucv interrupts to the work queue.
720  */
721 static void __iucv_cleanup_queue(void *dummy)
722 {
723 }
724 
725 /**
726  * iucv_cleanup_queue
727  *
728  * Function called after a path has been severed to find all remaining
729  * work items for the now stale pathid. The caller needs to hold the
730  * iucv_table_lock.
731  */
732 static void iucv_cleanup_queue(void)
733 {
734         struct iucv_irq_list *p, *n;
735 
736         /*
737          * When a path is severed, the pathid can be reused immediately
738          * on a iucv connect or a connection pending interrupt. Remove
739          * all entries from the task queue that refer to a stale pathid
740          * (iucv_path_table[ix] == NULL). Only then do the iucv connect
741          * or deliver the connection pending interrupt. To get all the
742          * pending interrupts force them to the work queue by calling
743          * an empty function on all cpus.
744          */
745         smp_call_function(__iucv_cleanup_queue, NULL, 1);
746         spin_lock_irq(&iucv_queue_lock);
747         list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
748                 /* Remove stale work items from the task queue. */
749                 if (iucv_path_table[p->data.ippathid] == NULL) {
750                         list_del(&p->list);
751                         kfree(p);
752                 }
753         }
754         spin_unlock_irq(&iucv_queue_lock);
755 }
756 
757 /**
758  * iucv_register:
759  * @handler: address of iucv handler structure
760  * @smp: != 0 indicates that the handler can deal with out of order messages
761  *
762  * Registers a driver with IUCV.
763  *
764  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
765  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
766  */
767 int iucv_register(struct iucv_handler *handler, int smp)
768 {
769         int rc;
770 
771         if (!iucv_available)
772                 return -ENOSYS;
773         mutex_lock(&iucv_register_mutex);
774         if (!smp)
775                 iucv_nonsmp_handler++;
776         if (list_empty(&iucv_handler_list)) {
777                 rc = iucv_enable();
778                 if (rc)
779                         goto out_mutex;
780         } else if (!smp && iucv_nonsmp_handler == 1)
781                 iucv_setmask_up();
782         INIT_LIST_HEAD(&handler->paths);
783 
784         spin_lock_bh(&iucv_table_lock);
785         list_add_tail(&handler->list, &iucv_handler_list);
786         spin_unlock_bh(&iucv_table_lock);
787         rc = 0;
788 out_mutex:
789         mutex_unlock(&iucv_register_mutex);
790         return rc;
791 }
792 EXPORT_SYMBOL(iucv_register);
793 
794 /**
795  * iucv_unregister
796  * @handler:  address of iucv handler structure
797  * @smp: != 0 indicates that the handler can deal with out of order messages
798  *
799  * Unregister driver from IUCV.
800  */
801 void iucv_unregister(struct iucv_handler *handler, int smp)
802 {
803         struct iucv_path *p, *n;
804 
805         mutex_lock(&iucv_register_mutex);
806         spin_lock_bh(&iucv_table_lock);
807         /* Remove handler from the iucv_handler_list. */
808         list_del_init(&handler->list);
809         /* Sever all pathids still referring to the handler. */
810         list_for_each_entry_safe(p, n, &handler->paths, list) {
811                 iucv_sever_pathid(p->pathid, NULL);
812                 iucv_path_table[p->pathid] = NULL;
813                 list_del(&p->list);
814                 iucv_path_free(p);
815         }
816         spin_unlock_bh(&iucv_table_lock);
817         if (!smp)
818                 iucv_nonsmp_handler--;
819         if (list_empty(&iucv_handler_list))
820                 iucv_disable();
821         else if (!smp && iucv_nonsmp_handler == 0)
822                 iucv_setmask_mp();
823         mutex_unlock(&iucv_register_mutex);
824 }
825 EXPORT_SYMBOL(iucv_unregister);
826 
827 static int iucv_reboot_event(struct notifier_block *this,
828                              unsigned long event, void *ptr)
829 {
830         int i;
831 
832         if (cpumask_empty(&iucv_irq_cpumask))
833                 return NOTIFY_DONE;
834 
835         get_online_cpus();
836         on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
837         preempt_disable();
838         for (i = 0; i < iucv_max_pathid; i++) {
839                 if (iucv_path_table[i])
840                         iucv_sever_pathid(i, NULL);
841         }
842         preempt_enable();
843         put_online_cpus();
844         iucv_disable();
845         return NOTIFY_DONE;
846 }
847 
848 static struct notifier_block iucv_reboot_notifier = {
849         .notifier_call = iucv_reboot_event,
850 };
851 
852 /**
853  * iucv_path_accept
854  * @path: address of iucv path structure
855  * @handler: address of iucv handler structure
856  * @userdata: 16 bytes of data reflected to the communication partner
857  * @private: private data passed to interrupt handlers for this path
858  *
859  * This function is issued after the user received a connection pending
860  * external interrupt and now wishes to complete the IUCV communication path.
861  *
862  * Returns the result of the CP IUCV call.
863  */
864 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
865                      u8 *userdata, void *private)
866 {
867         union iucv_param *parm;
868         int rc;
869 
870         local_bh_disable();
871         if (cpumask_empty(&iucv_buffer_cpumask)) {
872                 rc = -EIO;
873                 goto out;
874         }
875         /* Prepare parameter block. */
876         parm = iucv_param[smp_processor_id()];
877         memset(parm, 0, sizeof(union iucv_param));
878         parm->ctrl.ippathid = path->pathid;
879         parm->ctrl.ipmsglim = path->msglim;
880         if (userdata)
881                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
882         parm->ctrl.ipflags1 = path->flags;
883 
884         rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
885         if (!rc) {
886                 path->private = private;
887                 path->msglim = parm->ctrl.ipmsglim;
888                 path->flags = parm->ctrl.ipflags1;
889         }
890 out:
891         local_bh_enable();
892         return rc;
893 }
894 EXPORT_SYMBOL(iucv_path_accept);
895 
896 /**
897  * iucv_path_connect
898  * @path: address of iucv path structure
899  * @handler: address of iucv handler structure
900  * @userid: 8-byte user identification
901  * @system: 8-byte target system identification
902  * @userdata: 16 bytes of data reflected to the communication partner
903  * @private: private data passed to interrupt handlers for this path
904  *
905  * This function establishes an IUCV path. Although the connect may complete
906  * successfully, you are not able to use the path until you receive an IUCV
907  * Connection Complete external interrupt.
908  *
909  * Returns the result of the CP IUCV call.
910  */
911 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
912                       u8 *userid, u8 *system, u8 *userdata,
913                       void *private)
914 {
915         union iucv_param *parm;
916         int rc;
917 
918         spin_lock_bh(&iucv_table_lock);
919         iucv_cleanup_queue();
920         if (cpumask_empty(&iucv_buffer_cpumask)) {
921                 rc = -EIO;
922                 goto out;
923         }
924         parm = iucv_param[smp_processor_id()];
925         memset(parm, 0, sizeof(union iucv_param));
926         parm->ctrl.ipmsglim = path->msglim;
927         parm->ctrl.ipflags1 = path->flags;
928         if (userid) {
929                 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
930                 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
931                 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
932         }
933         if (system) {
934                 memcpy(parm->ctrl.iptarget, system,
935                        sizeof(parm->ctrl.iptarget));
936                 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
937                 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
938         }
939         if (userdata)
940                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
941 
942         rc = iucv_call_b2f0(IUCV_CONNECT, parm);
943         if (!rc) {
944                 if (parm->ctrl.ippathid < iucv_max_pathid) {
945                         path->pathid = parm->ctrl.ippathid;
946                         path->msglim = parm->ctrl.ipmsglim;
947                         path->flags = parm->ctrl.ipflags1;
948                         path->handler = handler;
949                         path->private = private;
950                         list_add_tail(&path->list, &handler->paths);
951                         iucv_path_table[path->pathid] = path;
952                 } else {
953                         iucv_sever_pathid(parm->ctrl.ippathid,
954                                           iucv_error_pathid);
955                         rc = -EIO;
956                 }
957         }
958 out:
959         spin_unlock_bh(&iucv_table_lock);
960         return rc;
961 }
962 EXPORT_SYMBOL(iucv_path_connect);
963 
964 /**
965  * iucv_path_quiesce:
966  * @path: address of iucv path structure
967  * @userdata: 16 bytes of data reflected to the communication partner
968  *
969  * This function temporarily suspends incoming messages on an IUCV path.
970  * You can later reactivate the path by invoking the iucv_resume function.
971  *
972  * Returns the result from the CP IUCV call.
973  */
974 int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
975 {
976         union iucv_param *parm;
977         int rc;
978 
979         local_bh_disable();
980         if (cpumask_empty(&iucv_buffer_cpumask)) {
981                 rc = -EIO;
982                 goto out;
983         }
984         parm = iucv_param[smp_processor_id()];
985         memset(parm, 0, sizeof(union iucv_param));
986         if (userdata)
987                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
988         parm->ctrl.ippathid = path->pathid;
989         rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
990 out:
991         local_bh_enable();
992         return rc;
993 }
994 EXPORT_SYMBOL(iucv_path_quiesce);
995 
996 /**
997  * iucv_path_resume:
998  * @path: address of iucv path structure
999  * @userdata: 16 bytes of data reflected to the communication partner
1000  *
1001  * This function resumes incoming messages on an IUCV path that has
1002  * been stopped with iucv_path_quiesce.
1003  *
1004  * Returns the result from the CP IUCV call.
1005  */
1006 int iucv_path_resume(struct iucv_path *path, u8 *userdata)
1007 {
1008         union iucv_param *parm;
1009         int rc;
1010 
1011         local_bh_disable();
1012         if (cpumask_empty(&iucv_buffer_cpumask)) {
1013                 rc = -EIO;
1014                 goto out;
1015         }
1016         parm = iucv_param[smp_processor_id()];
1017         memset(parm, 0, sizeof(union iucv_param));
1018         if (userdata)
1019                 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1020         parm->ctrl.ippathid = path->pathid;
1021         rc = iucv_call_b2f0(IUCV_RESUME, parm);
1022 out:
1023         local_bh_enable();
1024         return rc;
1025 }
1026 
1027 /**
1028  * iucv_path_sever
1029  * @path: address of iucv path structure
1030  * @userdata: 16 bytes of data reflected to the communication partner
1031  *
1032  * This function terminates an IUCV path.
1033  *
1034  * Returns the result from the CP IUCV call.
1035  */
1036 int iucv_path_sever(struct iucv_path *path, u8 *userdata)
1037 {
1038         int rc;
1039 
1040         preempt_disable();
1041         if (cpumask_empty(&iucv_buffer_cpumask)) {
1042                 rc = -EIO;
1043                 goto out;
1044         }
1045         if (iucv_active_cpu != smp_processor_id())
1046                 spin_lock_bh(&iucv_table_lock);
1047         rc = iucv_sever_pathid(path->pathid, userdata);
1048         iucv_path_table[path->pathid] = NULL;
1049         list_del_init(&path->list);
1050         if (iucv_active_cpu != smp_processor_id())
1051                 spin_unlock_bh(&iucv_table_lock);
1052 out:
1053         preempt_enable();
1054         return rc;
1055 }
1056 EXPORT_SYMBOL(iucv_path_sever);
1057 
1058 /**
1059  * iucv_message_purge
1060  * @path: address of iucv path structure
1061  * @msg: address of iucv msg structure
1062  * @srccls: source class of message
1063  *
1064  * Cancels a message you have sent.
1065  *
1066  * Returns the result from the CP IUCV call.
1067  */
1068 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1069                        u32 srccls)
1070 {
1071         union iucv_param *parm;
1072         int rc;
1073 
1074         local_bh_disable();
1075         if (cpumask_empty(&iucv_buffer_cpumask)) {
1076                 rc = -EIO;
1077                 goto out;
1078         }
1079         parm = iucv_param[smp_processor_id()];
1080         memset(parm, 0, sizeof(union iucv_param));
1081         parm->purge.ippathid = path->pathid;
1082         parm->purge.ipmsgid = msg->id;
1083         parm->purge.ipsrccls = srccls;
1084         parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1085         rc = iucv_call_b2f0(IUCV_PURGE, parm);
1086         if (!rc) {
1087                 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1088                 msg->tag = parm->purge.ipmsgtag;
1089         }
1090 out:
1091         local_bh_enable();
1092         return rc;
1093 }
1094 EXPORT_SYMBOL(iucv_message_purge);
1095 
1096 /**
1097  * iucv_message_receive_iprmdata
1098  * @path: address of iucv path structure
1099  * @msg: address of iucv msg structure
1100  * @flags: how the message is received (IUCV_IPBUFLST)
1101  * @buffer: address of data buffer or address of struct iucv_array
1102  * @size: length of data buffer
1103  * @residual:
1104  *
1105  * Internal function used by iucv_message_receive and __iucv_message_receive
1106  * to receive RMDATA data stored in struct iucv_message.
1107  */
1108 static int iucv_message_receive_iprmdata(struct iucv_path *path,
1109                                          struct iucv_message *msg,
1110                                          u8 flags, void *buffer,
1111                                          size_t size, size_t *residual)
1112 {
1113         struct iucv_array *array;
1114         u8 *rmmsg;
1115         size_t copy;
1116 
1117         /*
1118          * Message is 8 bytes long and has been stored to the
1119          * message descriptor itself.
1120          */
1121         if (residual)
1122                 *residual = abs(size - 8);
1123         rmmsg = msg->rmmsg;
1124         if (flags & IUCV_IPBUFLST) {
1125                 /* Copy to struct iucv_array. */
1126                 size = (size < 8) ? size : 8;
1127                 for (array = buffer; size > 0; array++) {
1128                         copy = min_t(size_t, size, array->length);
1129                         memcpy((u8 *)(addr_t) array->address,
1130                                 rmmsg, copy);
1131                         rmmsg += copy;
1132                         size -= copy;
1133                 }
1134         } else {
1135                 /* Copy to direct buffer. */
1136                 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1137         }
1138         return 0;
1139 }
1140 
1141 /**
1142  * __iucv_message_receive
1143  * @path: address of iucv path structure
1144  * @msg: address of iucv msg structure
1145  * @flags: how the message is received (IUCV_IPBUFLST)
1146  * @buffer: address of data buffer or address of struct iucv_array
1147  * @size: length of data buffer
1148  * @residual:
1149  *
1150  * This function receives messages that are being sent to you over
1151  * established paths. This function will deal with RMDATA messages
1152  * embedded in struct iucv_message as well.
1153  *
1154  * Locking:     no locking
1155  *
1156  * Returns the result from the CP IUCV call.
1157  */
1158 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1159                            u8 flags, void *buffer, size_t size, size_t *residual)
1160 {
1161         union iucv_param *parm;
1162         int rc;
1163 
1164         if (msg->flags & IUCV_IPRMDATA)
1165                 return iucv_message_receive_iprmdata(path, msg, flags,
1166                                                      buffer, size, residual);
1167          if (cpumask_empty(&iucv_buffer_cpumask)) {
1168                 rc = -EIO;
1169                 goto out;
1170         }
1171         parm = iucv_param[smp_processor_id()];
1172         memset(parm, 0, sizeof(union iucv_param));
1173         parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1174         parm->db.ipbfln1f = (u32) size;
1175         parm->db.ipmsgid = msg->id;
1176         parm->db.ippathid = path->pathid;
1177         parm->db.iptrgcls = msg->class;
1178         parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1179                              IUCV_IPFGMID | IUCV_IPTRGCLS);
1180         rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1181         if (!rc || rc == 5) {
1182                 msg->flags = parm->db.ipflags1;
1183                 if (residual)
1184                         *residual = parm->db.ipbfln1f;
1185         }
1186 out:
1187         return rc;
1188 }
1189 EXPORT_SYMBOL(__iucv_message_receive);
1190 
1191 /**
1192  * iucv_message_receive
1193  * @path: address of iucv path structure
1194  * @msg: address of iucv msg structure
1195  * @flags: how the message is received (IUCV_IPBUFLST)
1196  * @buffer: address of data buffer or address of struct iucv_array
1197  * @size: length of data buffer
1198  * @residual:
1199  *
1200  * This function receives messages that are being sent to you over
1201  * established paths. This function will deal with RMDATA messages
1202  * embedded in struct iucv_message as well.
1203  *
1204  * Locking:     local_bh_enable/local_bh_disable
1205  *
1206  * Returns the result from the CP IUCV call.
1207  */
1208 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1209                          u8 flags, void *buffer, size_t size, size_t *residual)
1210 {
1211         int rc;
1212 
1213         if (msg->flags & IUCV_IPRMDATA)
1214                 return iucv_message_receive_iprmdata(path, msg, flags,
1215                                                      buffer, size, residual);
1216         local_bh_disable();
1217         rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1218         local_bh_enable();
1219         return rc;
1220 }
1221 EXPORT_SYMBOL(iucv_message_receive);
1222 
1223 /**
1224  * iucv_message_reject
1225  * @path: address of iucv path structure
1226  * @msg: address of iucv msg structure
1227  *
1228  * The reject function refuses a specified message. Between the time you
1229  * are notified of a message and the time that you complete the message,
1230  * the message may be rejected.
1231  *
1232  * Returns the result from the CP IUCV call.
1233  */
1234 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1235 {
1236         union iucv_param *parm;
1237         int rc;
1238 
1239         local_bh_disable();
1240         if (cpumask_empty(&iucv_buffer_cpumask)) {
1241                 rc = -EIO;
1242                 goto out;
1243         }
1244         parm = iucv_param[smp_processor_id()];
1245         memset(parm, 0, sizeof(union iucv_param));
1246         parm->db.ippathid = path->pathid;
1247         parm->db.ipmsgid = msg->id;
1248         parm->db.iptrgcls = msg->class;
1249         parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1250         rc = iucv_call_b2f0(IUCV_REJECT, parm);
1251 out:
1252         local_bh_enable();
1253         return rc;
1254 }
1255 EXPORT_SYMBOL(iucv_message_reject);
1256 
1257 /**
1258  * iucv_message_reply
1259  * @path: address of iucv path structure
1260  * @msg: address of iucv msg structure
1261  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1262  * @reply: address of reply data buffer or address of struct iucv_array
1263  * @size: length of reply data buffer
1264  *
1265  * This function responds to the two-way messages that you receive. You
1266  * must identify completely the message to which you wish to reply. ie,
1267  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1268  * the parameter list.
1269  *
1270  * Returns the result from the CP IUCV call.
1271  */
1272 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1273                        u8 flags, void *reply, size_t size)
1274 {
1275         union iucv_param *parm;
1276         int rc;
1277 
1278         local_bh_disable();
1279         if (cpumask_empty(&iucv_buffer_cpumask)) {
1280                 rc = -EIO;
1281                 goto out;
1282         }
1283         parm = iucv_param[smp_processor_id()];
1284         memset(parm, 0, sizeof(union iucv_param));
1285         if (flags & IUCV_IPRMDATA) {
1286                 parm->dpl.ippathid = path->pathid;
1287                 parm->dpl.ipflags1 = flags;
1288                 parm->dpl.ipmsgid = msg->id;
1289                 parm->dpl.iptrgcls = msg->class;
1290                 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1291         } else {
1292                 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1293                 parm->db.ipbfln1f = (u32) size;
1294                 parm->db.ippathid = path->pathid;
1295                 parm->db.ipflags1 = flags;
1296                 parm->db.ipmsgid = msg->id;
1297                 parm->db.iptrgcls = msg->class;
1298         }
1299         rc = iucv_call_b2f0(IUCV_REPLY, parm);
1300 out:
1301         local_bh_enable();
1302         return rc;
1303 }
1304 EXPORT_SYMBOL(iucv_message_reply);
1305 
1306 /**
1307  * __iucv_message_send
1308  * @path: address of iucv path structure
1309  * @msg: address of iucv msg structure
1310  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1311  * @srccls: source class of message
1312  * @buffer: address of send buffer or address of struct iucv_array
1313  * @size: length of send buffer
1314  *
1315  * This function transmits data to another application. Data to be
1316  * transmitted is in a buffer and this is a one-way message and the
1317  * receiver will not reply to the message.
1318  *
1319  * Locking:     no locking
1320  *
1321  * Returns the result from the CP IUCV call.
1322  */
1323 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1324                       u8 flags, u32 srccls, void *buffer, size_t size)
1325 {
1326         union iucv_param *parm;
1327         int rc;
1328 
1329         if (cpumask_empty(&iucv_buffer_cpumask)) {
1330                 rc = -EIO;
1331                 goto out;
1332         }
1333         parm = iucv_param[smp_processor_id()];
1334         memset(parm, 0, sizeof(union iucv_param));
1335         if (flags & IUCV_IPRMDATA) {
1336                 /* Message of 8 bytes can be placed into the parameter list. */
1337                 parm->dpl.ippathid = path->pathid;
1338                 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1339                 parm->dpl.iptrgcls = msg->class;
1340                 parm->dpl.ipsrccls = srccls;
1341                 parm->dpl.ipmsgtag = msg->tag;
1342                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1343         } else {
1344                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1345                 parm->db.ipbfln1f = (u32) size;
1346                 parm->db.ippathid = path->pathid;
1347                 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1348                 parm->db.iptrgcls = msg->class;
1349                 parm->db.ipsrccls = srccls;
1350                 parm->db.ipmsgtag = msg->tag;
1351         }
1352         rc = iucv_call_b2f0(IUCV_SEND, parm);
1353         if (!rc)
1354                 msg->id = parm->db.ipmsgid;
1355 out:
1356         return rc;
1357 }
1358 EXPORT_SYMBOL(__iucv_message_send);
1359 
1360 /**
1361  * iucv_message_send
1362  * @path: address of iucv path structure
1363  * @msg: address of iucv msg structure
1364  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1365  * @srccls: source class of message
1366  * @buffer: address of send buffer or address of struct iucv_array
1367  * @size: length of send buffer
1368  *
1369  * This function transmits data to another application. Data to be
1370  * transmitted is in a buffer and this is a one-way message and the
1371  * receiver will not reply to the message.
1372  *
1373  * Locking:     local_bh_enable/local_bh_disable
1374  *
1375  * Returns the result from the CP IUCV call.
1376  */
1377 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1378                       u8 flags, u32 srccls, void *buffer, size_t size)
1379 {
1380         int rc;
1381 
1382         local_bh_disable();
1383         rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1384         local_bh_enable();
1385         return rc;
1386 }
1387 EXPORT_SYMBOL(iucv_message_send);
1388 
1389 /**
1390  * iucv_message_send2way
1391  * @path: address of iucv path structure
1392  * @msg: address of iucv msg structure
1393  * @flags: how the message is sent and the reply is received
1394  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1395  * @srccls: source class of message
1396  * @buffer: address of send buffer or address of struct iucv_array
1397  * @size: length of send buffer
1398  * @ansbuf: address of answer buffer or address of struct iucv_array
1399  * @asize: size of reply buffer
1400  *
1401  * This function transmits data to another application. Data to be
1402  * transmitted is in a buffer. The receiver of the send is expected to
1403  * reply to the message and a buffer is provided into which IUCV moves
1404  * the reply to this message.
1405  *
1406  * Returns the result from the CP IUCV call.
1407  */
1408 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1409                           u8 flags, u32 srccls, void *buffer, size_t size,
1410                           void *answer, size_t asize, size_t *residual)
1411 {
1412         union iucv_param *parm;
1413         int rc;
1414 
1415         local_bh_disable();
1416         if (cpumask_empty(&iucv_buffer_cpumask)) {
1417                 rc = -EIO;
1418                 goto out;
1419         }
1420         parm = iucv_param[smp_processor_id()];
1421         memset(parm, 0, sizeof(union iucv_param));
1422         if (flags & IUCV_IPRMDATA) {
1423                 parm->dpl.ippathid = path->pathid;
1424                 parm->dpl.ipflags1 = path->flags;       /* priority message */
1425                 parm->dpl.iptrgcls = msg->class;
1426                 parm->dpl.ipsrccls = srccls;
1427                 parm->dpl.ipmsgtag = msg->tag;
1428                 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1429                 parm->dpl.ipbfln2f = (u32) asize;
1430                 memcpy(parm->dpl.iprmmsg, buffer, 8);
1431         } else {
1432                 parm->db.ippathid = path->pathid;
1433                 parm->db.ipflags1 = path->flags;        /* priority message */
1434                 parm->db.iptrgcls = msg->class;
1435                 parm->db.ipsrccls = srccls;
1436                 parm->db.ipmsgtag = msg->tag;
1437                 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1438                 parm->db.ipbfln1f = (u32) size;
1439                 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1440                 parm->db.ipbfln2f = (u32) asize;
1441         }
1442         rc = iucv_call_b2f0(IUCV_SEND, parm);
1443         if (!rc)
1444                 msg->id = parm->db.ipmsgid;
1445 out:
1446         local_bh_enable();
1447         return rc;
1448 }
1449 EXPORT_SYMBOL(iucv_message_send2way);
1450 
1451 /**
1452  * iucv_path_pending
1453  * @data: Pointer to external interrupt buffer
1454  *
1455  * Process connection pending work item. Called from tasklet while holding
1456  * iucv_table_lock.
1457  */
1458 struct iucv_path_pending {
1459         u16 ippathid;
1460         u8  ipflags1;
1461         u8  iptype;
1462         u16 ipmsglim;
1463         u16 res1;
1464         u8  ipvmid[8];
1465         u8  ipuser[16];
1466         u32 res3;
1467         u8  ippollfg;
1468         u8  res4[3];
1469 } __packed;
1470 
1471 static void iucv_path_pending(struct iucv_irq_data *data)
1472 {
1473         struct iucv_path_pending *ipp = (void *) data;
1474         struct iucv_handler *handler;
1475         struct iucv_path *path;
1476         char *error;
1477 
1478         BUG_ON(iucv_path_table[ipp->ippathid]);
1479         /* New pathid, handler found. Create a new path struct. */
1480         error = iucv_error_no_memory;
1481         path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1482         if (!path)
1483                 goto out_sever;
1484         path->pathid = ipp->ippathid;
1485         iucv_path_table[path->pathid] = path;
1486         EBCASC(ipp->ipvmid, 8);
1487 
1488         /* Call registered handler until one is found that wants the path. */
1489         list_for_each_entry(handler, &iucv_handler_list, list) {
1490                 if (!handler->path_pending)
1491                         continue;
1492                 /*
1493                  * Add path to handler to allow a call to iucv_path_sever
1494                  * inside the path_pending function. If the handler returns
1495                  * an error remove the path from the handler again.
1496                  */
1497                 list_add(&path->list, &handler->paths);
1498                 path->handler = handler;
1499                 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1500                         return;
1501                 list_del(&path->list);
1502                 path->handler = NULL;
1503         }
1504         /* No handler wanted the path. */
1505         iucv_path_table[path->pathid] = NULL;
1506         iucv_path_free(path);
1507         error = iucv_error_no_listener;
1508 out_sever:
1509         iucv_sever_pathid(ipp->ippathid, error);
1510 }
1511 
1512 /**
1513  * iucv_path_complete
1514  * @data: Pointer to external interrupt buffer
1515  *
1516  * Process connection complete work item. Called from tasklet while holding
1517  * iucv_table_lock.
1518  */
1519 struct iucv_path_complete {
1520         u16 ippathid;
1521         u8  ipflags1;
1522         u8  iptype;
1523         u16 ipmsglim;
1524         u16 res1;
1525         u8  res2[8];
1526         u8  ipuser[16];
1527         u32 res3;
1528         u8  ippollfg;
1529         u8  res4[3];
1530 } __packed;
1531 
1532 static void iucv_path_complete(struct iucv_irq_data *data)
1533 {
1534         struct iucv_path_complete *ipc = (void *) data;
1535         struct iucv_path *path = iucv_path_table[ipc->ippathid];
1536 
1537         if (path)
1538                 path->flags = ipc->ipflags1;
1539         if (path && path->handler && path->handler->path_complete)
1540                 path->handler->path_complete(path, ipc->ipuser);
1541 }
1542 
1543 /**
1544  * iucv_path_severed
1545  * @data: Pointer to external interrupt buffer
1546  *
1547  * Process connection severed work item. Called from tasklet while holding
1548  * iucv_table_lock.
1549  */
1550 struct iucv_path_severed {
1551         u16 ippathid;
1552         u8  res1;
1553         u8  iptype;
1554         u32 res2;
1555         u8  res3[8];
1556         u8  ipuser[16];
1557         u32 res4;
1558         u8  ippollfg;
1559         u8  res5[3];
1560 } __packed;
1561 
1562 static void iucv_path_severed(struct iucv_irq_data *data)
1563 {
1564         struct iucv_path_severed *ips = (void *) data;
1565         struct iucv_path *path = iucv_path_table[ips->ippathid];
1566 
1567         if (!path || !path->handler)    /* Already severed */
1568                 return;
1569         if (path->handler->path_severed)
1570                 path->handler->path_severed(path, ips->ipuser);
1571         else {
1572                 iucv_sever_pathid(path->pathid, NULL);
1573                 iucv_path_table[path->pathid] = NULL;
1574                 list_del(&path->list);
1575                 iucv_path_free(path);
1576         }
1577 }
1578 
1579 /**
1580  * iucv_path_quiesced
1581  * @data: Pointer to external interrupt buffer
1582  *
1583  * Process connection quiesced work item. Called from tasklet while holding
1584  * iucv_table_lock.
1585  */
1586 struct iucv_path_quiesced {
1587         u16 ippathid;
1588         u8  res1;
1589         u8  iptype;
1590         u32 res2;
1591         u8  res3[8];
1592         u8  ipuser[16];
1593         u32 res4;
1594         u8  ippollfg;
1595         u8  res5[3];
1596 } __packed;
1597 
1598 static void iucv_path_quiesced(struct iucv_irq_data *data)
1599 {
1600         struct iucv_path_quiesced *ipq = (void *) data;
1601         struct iucv_path *path = iucv_path_table[ipq->ippathid];
1602 
1603         if (path && path->handler && path->handler->path_quiesced)
1604                 path->handler->path_quiesced(path, ipq->ipuser);
1605 }
1606 
1607 /**
1608  * iucv_path_resumed
1609  * @data: Pointer to external interrupt buffer
1610  *
1611  * Process connection resumed work item. Called from tasklet while holding
1612  * iucv_table_lock.
1613  */
1614 struct iucv_path_resumed {
1615         u16 ippathid;
1616         u8  res1;
1617         u8  iptype;
1618         u32 res2;
1619         u8  res3[8];
1620         u8  ipuser[16];
1621         u32 res4;
1622         u8  ippollfg;
1623         u8  res5[3];
1624 } __packed;
1625 
1626 static void iucv_path_resumed(struct iucv_irq_data *data)
1627 {
1628         struct iucv_path_resumed *ipr = (void *) data;
1629         struct iucv_path *path = iucv_path_table[ipr->ippathid];
1630 
1631         if (path && path->handler && path->handler->path_resumed)
1632                 path->handler->path_resumed(path, ipr->ipuser);
1633 }
1634 
1635 /**
1636  * iucv_message_complete
1637  * @data: Pointer to external interrupt buffer
1638  *
1639  * Process message complete work item. Called from tasklet while holding
1640  * iucv_table_lock.
1641  */
1642 struct iucv_message_complete {
1643         u16 ippathid;
1644         u8  ipflags1;
1645         u8  iptype;
1646         u32 ipmsgid;
1647         u32 ipaudit;
1648         u8  iprmmsg[8];
1649         u32 ipsrccls;
1650         u32 ipmsgtag;
1651         u32 res;
1652         u32 ipbfln2f;
1653         u8  ippollfg;
1654         u8  res2[3];
1655 } __packed;
1656 
1657 static void iucv_message_complete(struct iucv_irq_data *data)
1658 {
1659         struct iucv_message_complete *imc = (void *) data;
1660         struct iucv_path *path = iucv_path_table[imc->ippathid];
1661         struct iucv_message msg;
1662 
1663         if (path && path->handler && path->handler->message_complete) {
1664                 msg.flags = imc->ipflags1;
1665                 msg.id = imc->ipmsgid;
1666                 msg.audit = imc->ipaudit;
1667                 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1668                 msg.class = imc->ipsrccls;
1669                 msg.tag = imc->ipmsgtag;
1670                 msg.length = imc->ipbfln2f;
1671                 path->handler->message_complete(path, &msg);
1672         }
1673 }
1674 
1675 /**
1676  * iucv_message_pending
1677  * @data: Pointer to external interrupt buffer
1678  *
1679  * Process message pending work item. Called from tasklet while holding
1680  * iucv_table_lock.
1681  */
1682 struct iucv_message_pending {
1683         u16 ippathid;
1684         u8  ipflags1;
1685         u8  iptype;
1686         u32 ipmsgid;
1687         u32 iptrgcls;
1688         union {
1689                 u32 iprmmsg1_u32;
1690                 u8  iprmmsg1[4];
1691         } ln1msg1;
1692         union {
1693                 u32 ipbfln1f;
1694                 u8  iprmmsg2[4];
1695         } ln1msg2;
1696         u32 res1[3];
1697         u32 ipbfln2f;
1698         u8  ippollfg;
1699         u8  res2[3];
1700 } __packed;
1701 
1702 static void iucv_message_pending(struct iucv_irq_data *data)
1703 {
1704         struct iucv_message_pending *imp = (void *) data;
1705         struct iucv_path *path = iucv_path_table[imp->ippathid];
1706         struct iucv_message msg;
1707 
1708         if (path && path->handler && path->handler->message_pending) {
1709                 msg.flags = imp->ipflags1;
1710                 msg.id = imp->ipmsgid;
1711                 msg.class = imp->iptrgcls;
1712                 if (imp->ipflags1 & IUCV_IPRMDATA) {
1713                         memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1714                         msg.length = 8;
1715                 } else
1716                         msg.length = imp->ln1msg2.ipbfln1f;
1717                 msg.reply_size = imp->ipbfln2f;
1718                 path->handler->message_pending(path, &msg);
1719         }
1720 }
1721 
1722 /**
1723  * iucv_tasklet_fn:
1724  *
1725  * This tasklet loops over the queue of irq buffers created by
1726  * iucv_external_interrupt, calls the appropriate action handler
1727  * and then frees the buffer.
1728  */
1729 static void iucv_tasklet_fn(unsigned long ignored)
1730 {
1731         typedef void iucv_irq_fn(struct iucv_irq_data *);
1732         static iucv_irq_fn *irq_fn[] = {
1733                 [0x02] = iucv_path_complete,
1734                 [0x03] = iucv_path_severed,
1735                 [0x04] = iucv_path_quiesced,
1736                 [0x05] = iucv_path_resumed,
1737                 [0x06] = iucv_message_complete,
1738                 [0x07] = iucv_message_complete,
1739                 [0x08] = iucv_message_pending,
1740                 [0x09] = iucv_message_pending,
1741         };
1742         LIST_HEAD(task_queue);
1743         struct iucv_irq_list *p, *n;
1744 
1745         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1746         if (!spin_trylock(&iucv_table_lock)) {
1747                 tasklet_schedule(&iucv_tasklet);
1748                 return;
1749         }
1750         iucv_active_cpu = smp_processor_id();
1751 
1752         spin_lock_irq(&iucv_queue_lock);
1753         list_splice_init(&iucv_task_queue, &task_queue);
1754         spin_unlock_irq(&iucv_queue_lock);
1755 
1756         list_for_each_entry_safe(p, n, &task_queue, list) {
1757                 list_del_init(&p->list);
1758                 irq_fn[p->data.iptype](&p->data);
1759                 kfree(p);
1760         }
1761 
1762         iucv_active_cpu = -1;
1763         spin_unlock(&iucv_table_lock);
1764 }
1765 
1766 /**
1767  * iucv_work_fn:
1768  *
1769  * This work function loops over the queue of path pending irq blocks
1770  * created by iucv_external_interrupt, calls the appropriate action
1771  * handler and then frees the buffer.
1772  */
1773 static void iucv_work_fn(struct work_struct *work)
1774 {
1775         LIST_HEAD(work_queue);
1776         struct iucv_irq_list *p, *n;
1777 
1778         /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1779         spin_lock_bh(&iucv_table_lock);
1780         iucv_active_cpu = smp_processor_id();
1781 
1782         spin_lock_irq(&iucv_queue_lock);
1783         list_splice_init(&iucv_work_queue, &work_queue);
1784         spin_unlock_irq(&iucv_queue_lock);
1785 
1786         iucv_cleanup_queue();
1787         list_for_each_entry_safe(p, n, &work_queue, list) {
1788                 list_del_init(&p->list);
1789                 iucv_path_pending(&p->data);
1790                 kfree(p);
1791         }
1792 
1793         iucv_active_cpu = -1;
1794         spin_unlock_bh(&iucv_table_lock);
1795 }
1796 
1797 /**
1798  * iucv_external_interrupt
1799  * @code: irq code
1800  *
1801  * Handles external interrupts coming in from CP.
1802  * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1803  */
1804 static void iucv_external_interrupt(struct ext_code ext_code,
1805                                     unsigned int param32, unsigned long param64)
1806 {
1807         struct iucv_irq_data *p;
1808         struct iucv_irq_list *work;
1809 
1810         inc_irq_stat(IRQEXT_IUC);
1811         p = iucv_irq_data[smp_processor_id()];
1812         if (p->ippathid >= iucv_max_pathid) {
1813                 WARN_ON(p->ippathid >= iucv_max_pathid);
1814                 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1815                 return;
1816         }
1817         BUG_ON(p->iptype  < 0x01 || p->iptype > 0x09);
1818         work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1819         if (!work) {
1820                 pr_warn("iucv_external_interrupt: out of memory\n");
1821                 return;
1822         }
1823         memcpy(&work->data, p, sizeof(work->data));
1824         spin_lock(&iucv_queue_lock);
1825         if (p->iptype == 0x01) {
1826                 /* Path pending interrupt. */
1827                 list_add_tail(&work->list, &iucv_work_queue);
1828                 schedule_work(&iucv_work);
1829         } else {
1830                 /* The other interrupts. */
1831                 list_add_tail(&work->list, &iucv_task_queue);
1832                 tasklet_schedule(&iucv_tasklet);
1833         }
1834         spin_unlock(&iucv_queue_lock);
1835 }
1836 
1837 static int iucv_pm_prepare(struct device *dev)
1838 {
1839         int rc = 0;
1840 
1841 #ifdef CONFIG_PM_DEBUG
1842         printk(KERN_INFO "iucv_pm_prepare\n");
1843 #endif
1844         if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1845                 rc = dev->driver->pm->prepare(dev);
1846         return rc;
1847 }
1848 
1849 static void iucv_pm_complete(struct device *dev)
1850 {
1851 #ifdef CONFIG_PM_DEBUG
1852         printk(KERN_INFO "iucv_pm_complete\n");
1853 #endif
1854         if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1855                 dev->driver->pm->complete(dev);
1856 }
1857 
1858 /**
1859  * iucv_path_table_empty() - determine if iucv path table is empty
1860  *
1861  * Returns 0 if there are still iucv pathes defined
1862  *         1 if there are no iucv pathes defined
1863  */
1864 static int iucv_path_table_empty(void)
1865 {
1866         int i;
1867 
1868         for (i = 0; i < iucv_max_pathid; i++) {
1869                 if (iucv_path_table[i])
1870                         return 0;
1871         }
1872         return 1;
1873 }
1874 
1875 /**
1876  * iucv_pm_freeze() - Freeze PM callback
1877  * @dev:        iucv-based device
1878  *
1879  * disable iucv interrupts
1880  * invoke callback function of the iucv-based driver
1881  * shut down iucv, if no iucv-pathes are established anymore
1882  */
1883 static int iucv_pm_freeze(struct device *dev)
1884 {
1885         int cpu;
1886         struct iucv_irq_list *p, *n;
1887         int rc = 0;
1888 
1889 #ifdef CONFIG_PM_DEBUG
1890         printk(KERN_WARNING "iucv_pm_freeze\n");
1891 #endif
1892         if (iucv_pm_state != IUCV_PM_FREEZING) {
1893                 for_each_cpu(cpu, &iucv_irq_cpumask)
1894                         smp_call_function_single(cpu, iucv_block_cpu_almost,
1895                                                  NULL, 1);
1896                 cancel_work_sync(&iucv_work);
1897                 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1898                         list_del_init(&p->list);
1899                         iucv_sever_pathid(p->data.ippathid,
1900                                           iucv_error_no_listener);
1901                         kfree(p);
1902                 }
1903         }
1904         iucv_pm_state = IUCV_PM_FREEZING;
1905         if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1906                 rc = dev->driver->pm->freeze(dev);
1907         if (iucv_path_table_empty())
1908                 iucv_disable();
1909         return rc;
1910 }
1911 
1912 /**
1913  * iucv_pm_thaw() - Thaw PM callback
1914  * @dev:        iucv-based device
1915  *
1916  * make iucv ready for use again: allocate path table, declare interrupt buffers
1917  *                                and enable iucv interrupts
1918  * invoke callback function of the iucv-based driver
1919  */
1920 static int iucv_pm_thaw(struct device *dev)
1921 {
1922         int rc = 0;
1923 
1924 #ifdef CONFIG_PM_DEBUG
1925         printk(KERN_WARNING "iucv_pm_thaw\n");
1926 #endif
1927         iucv_pm_state = IUCV_PM_THAWING;
1928         if (!iucv_path_table) {
1929                 rc = iucv_enable();
1930                 if (rc)
1931                         goto out;
1932         }
1933         if (cpumask_empty(&iucv_irq_cpumask)) {
1934                 if (iucv_nonsmp_handler)
1935                         /* enable interrupts on one cpu */
1936                         iucv_allow_cpu(NULL);
1937                 else
1938                         /* enable interrupts on all cpus */
1939                         iucv_setmask_mp();
1940         }
1941         if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1942                 rc = dev->driver->pm->thaw(dev);
1943 out:
1944         return rc;
1945 }
1946 
1947 /**
1948  * iucv_pm_restore() - Restore PM callback
1949  * @dev:        iucv-based device
1950  *
1951  * make iucv ready for use again: allocate path table, declare interrupt buffers
1952  *                                and enable iucv interrupts
1953  * invoke callback function of the iucv-based driver
1954  */
1955 static int iucv_pm_restore(struct device *dev)
1956 {
1957         int rc = 0;
1958 
1959 #ifdef CONFIG_PM_DEBUG
1960         printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1961 #endif
1962         if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1963                 pr_warn("Suspending Linux did not completely close all IUCV connections\n");
1964         iucv_pm_state = IUCV_PM_RESTORING;
1965         if (cpumask_empty(&iucv_irq_cpumask)) {
1966                 rc = iucv_query_maxconn();
1967                 rc = iucv_enable();
1968                 if (rc)
1969                         goto out;
1970         }
1971         if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1972                 rc = dev->driver->pm->restore(dev);
1973 out:
1974         return rc;
1975 }
1976 
1977 struct iucv_interface iucv_if = {
1978         .message_receive = iucv_message_receive,
1979         .__message_receive = __iucv_message_receive,
1980         .message_reply = iucv_message_reply,
1981         .message_reject = iucv_message_reject,
1982         .message_send = iucv_message_send,
1983         .__message_send = __iucv_message_send,
1984         .message_send2way = iucv_message_send2way,
1985         .message_purge = iucv_message_purge,
1986         .path_accept = iucv_path_accept,
1987         .path_connect = iucv_path_connect,
1988         .path_quiesce = iucv_path_quiesce,
1989         .path_resume = iucv_path_resume,
1990         .path_sever = iucv_path_sever,
1991         .iucv_register = iucv_register,
1992         .iucv_unregister = iucv_unregister,
1993         .bus = NULL,
1994         .root = NULL,
1995 };
1996 EXPORT_SYMBOL(iucv_if);
1997 
1998 static enum cpuhp_state iucv_online;
1999 /**
2000  * iucv_init
2001  *
2002  * Allocates and initializes various data structures.
2003  */
2004 static int __init iucv_init(void)
2005 {
2006         int rc;
2007 
2008         if (!MACHINE_IS_VM) {
2009                 rc = -EPROTONOSUPPORT;
2010                 goto out;
2011         }
2012         ctl_set_bit(0, 1);
2013         rc = iucv_query_maxconn();
2014         if (rc)
2015                 goto out_ctl;
2016         rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2017         if (rc)
2018                 goto out_ctl;
2019         iucv_root = root_device_register("iucv");
2020         if (IS_ERR(iucv_root)) {
2021                 rc = PTR_ERR(iucv_root);
2022                 goto out_int;
2023         }
2024 
2025         rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
2026                                iucv_cpu_prepare, iucv_cpu_dead);
2027         if (rc)
2028                 goto out_dev;
2029         rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
2030                                iucv_cpu_online, iucv_cpu_down_prep);
2031         if (rc < 0)
2032                 goto out_prep;
2033         iucv_online = rc;
2034 
2035         rc = register_reboot_notifier(&iucv_reboot_notifier);
2036         if (rc)
2037                 goto out_remove_hp;
2038         ASCEBC(iucv_error_no_listener, 16);
2039         ASCEBC(iucv_error_no_memory, 16);
2040         ASCEBC(iucv_error_pathid, 16);
2041         iucv_available = 1;
2042         rc = bus_register(&iucv_bus);
2043         if (rc)
2044                 goto out_reboot;
2045         iucv_if.root = iucv_root;
2046         iucv_if.bus = &iucv_bus;
2047         return 0;
2048 
2049 out_reboot:
2050         unregister_reboot_notifier(&iucv_reboot_notifier);
2051 out_remove_hp:
2052         cpuhp_remove_state(iucv_online);
2053 out_prep:
2054         cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
2055 out_dev:
2056         root_device_unregister(iucv_root);
2057 out_int:
2058         unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2059 out_ctl:
2060         ctl_clear_bit(0, 1);
2061 out:
2062         return rc;
2063 }
2064 
2065 /**
2066  * iucv_exit
2067  *
2068  * Frees everything allocated from iucv_init.
2069  */
2070 static void __exit iucv_exit(void)
2071 {
2072         struct iucv_irq_list *p, *n;
2073 
2074         spin_lock_irq(&iucv_queue_lock);
2075         list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2076                 kfree(p);
2077         list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2078                 kfree(p);
2079         spin_unlock_irq(&iucv_queue_lock);
2080         unregister_reboot_notifier(&iucv_reboot_notifier);
2081 
2082         cpuhp_remove_state_nocalls(iucv_online);
2083         cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
2084         root_device_unregister(iucv_root);
2085         bus_unregister(&iucv_bus);
2086         unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2087 }
2088 
2089 subsys_initcall(iucv_init);
2090 module_exit(iucv_exit);
2091 
2092 MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2093 MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2094 MODULE_LICENSE("GPL");
2095 

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