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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
65static int iucv_bus_match(struct device *dev, struct device_driver *drv)
66{
67 return 0;
68}
69
70struct bus_type iucv_bus = {
71 .name = "iucv",
72 .match = iucv_bus_match,
73};
74EXPORT_SYMBOL(iucv_bus);
75
76struct device *iucv_root;
77EXPORT_SYMBOL(iucv_root);
78
79static int iucv_available;
80
81/* General IUCV interrupt structure */
82struct iucv_irq_data {
83 u16 ippathid;
84 u8 ipflags1;
85 u8 iptype;
86 u32 res2[8];
87};
88
89struct iucv_irq_list {
90 struct list_head list;
91 struct iucv_irq_data data;
92};
93
94static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
95static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
96static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
97
98/*
99 * Queue of interrupt buffers lock for delivery via the tasklet
100 * (fast but can't call smp_call_function).
101 */
102static LIST_HEAD(iucv_task_queue);
103
104/*
105 * The tasklet for fast delivery of iucv interrupts.
106 */
107static void iucv_tasklet_fn(unsigned long);
108static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn);
109
110/*
111 * Queue of interrupt buffers for delivery via a work queue
112 * (slower but can call smp_call_function).
113 */
114static LIST_HEAD(iucv_work_queue);
115
116/*
117 * The work element to deliver path pending interrupts.
118 */
119static void iucv_work_fn(struct work_struct *work);
120static DECLARE_WORK(iucv_work, iucv_work_fn);
121
122/*
123 * Spinlock protecting task and work queue.
124 */
125static DEFINE_SPINLOCK(iucv_queue_lock);
126
127enum iucv_command_codes {
128 IUCV_QUERY = 0,
129 IUCV_RETRIEVE_BUFFER = 2,
130 IUCV_SEND = 4,
131 IUCV_RECEIVE = 5,
132 IUCV_REPLY = 6,
133 IUCV_REJECT = 8,
134 IUCV_PURGE = 9,
135 IUCV_ACCEPT = 10,
136 IUCV_CONNECT = 11,
137 IUCV_DECLARE_BUFFER = 12,
138 IUCV_QUIESCE = 13,
139 IUCV_RESUME = 14,
140 IUCV_SEVER = 15,
141 IUCV_SETMASK = 16,
142 IUCV_SETCONTROLMASK = 17,
143};
144
145/*
146 * Error messages that are used with the iucv_sever function. They get
147 * converted to EBCDIC.
148 */
149static char iucv_error_no_listener[16] = "NO LISTENER";
150static char iucv_error_no_memory[16] = "NO MEMORY";
151static char iucv_error_pathid[16] = "INVALID PATHID";
152
153/*
154 * iucv_handler_list: List of registered handlers.
155 */
156static LIST_HEAD(iucv_handler_list);
157
158/*
159 * iucv_path_table: an array of iucv_path structures.
160 */
161static struct iucv_path **iucv_path_table;
162static unsigned long iucv_max_pathid;
163
164/*
165 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
166 */
167static DEFINE_SPINLOCK(iucv_table_lock);
168
169/*
170 * iucv_active_cpu: contains the number of the cpu executing the tasklet
171 * or the work handler. Needed for iucv_path_sever called from tasklet.
172 */
173static int iucv_active_cpu = -1;
174
175/*
176 * Mutex and wait queue for iucv_register/iucv_unregister.
177 */
178static DEFINE_MUTEX(iucv_register_mutex);
179
180/*
181 * Counter for number of non-smp capable handlers.
182 */
183static int iucv_nonsmp_handler;
184
185/*
186 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
187 * iucv_path_quiesce and iucv_path_sever.
188 */
189struct iucv_cmd_control {
190 u16 ippathid;
191 u8 ipflags1;
192 u8 iprcode;
193 u16 ipmsglim;
194 u16 res1;
195 u8 ipvmid[8];
196 u8 ipuser[16];
197 u8 iptarget[8];
198} __attribute__ ((packed,aligned(8)));
199
200/*
201 * Data in parameter list iucv structure. Used by iucv_message_send,
202 * iucv_message_send2way and iucv_message_reply.
203 */
204struct iucv_cmd_dpl {
205 u16 ippathid;
206 u8 ipflags1;
207 u8 iprcode;
208 u32 ipmsgid;
209 u32 iptrgcls;
210 u8 iprmmsg[8];
211 u32 ipsrccls;
212 u32 ipmsgtag;
213 u32 ipbfadr2;
214 u32 ipbfln2f;
215 u32 res;
216} __attribute__ ((packed,aligned(8)));
217
218/*
219 * Data in buffer iucv structure. Used by iucv_message_receive,
220 * iucv_message_reject, iucv_message_send, iucv_message_send2way
221 * and iucv_declare_cpu.
222 */
223struct iucv_cmd_db {
224 u16 ippathid;
225 u8 ipflags1;
226 u8 iprcode;
227 u32 ipmsgid;
228 u32 iptrgcls;
229 u32 ipbfadr1;
230 u32 ipbfln1f;
231 u32 ipsrccls;
232 u32 ipmsgtag;
233 u32 ipbfadr2;
234 u32 ipbfln2f;
235 u32 res;
236} __attribute__ ((packed,aligned(8)));
237
238/*
239 * Purge message iucv structure. Used by iucv_message_purge.
240 */
241struct iucv_cmd_purge {
242 u16 ippathid;
243 u8 ipflags1;
244 u8 iprcode;
245 u32 ipmsgid;
246 u8 ipaudit[3];
247 u8 res1[5];
248 u32 res2;
249 u32 ipsrccls;
250 u32 ipmsgtag;
251 u32 res3[3];
252} __attribute__ ((packed,aligned(8)));
253
254/*
255 * Set mask iucv structure. Used by iucv_enable_cpu.
256 */
257struct iucv_cmd_set_mask {
258 u8 ipmask;
259 u8 res1[2];
260 u8 iprcode;
261 u32 res2[9];
262} __attribute__ ((packed,aligned(8)));
263
264union iucv_param {
265 struct iucv_cmd_control ctrl;
266 struct iucv_cmd_dpl dpl;
267 struct iucv_cmd_db db;
268 struct iucv_cmd_purge purge;
269 struct iucv_cmd_set_mask set_mask;
270};
271
272/*
273 * Anchor for per-cpu IUCV command parameter block.
274 */
275static union iucv_param *iucv_param[NR_CPUS];
276static union iucv_param *iucv_param_irq[NR_CPUS];
277
278/**
279 * iucv_call_b2f0
280 * @code: identifier of IUCV call to CP.
281 * @parm: pointer to a struct iucv_parm block
282 *
283 * Calls CP to execute IUCV commands.
284 *
285 * Returns the result of the CP IUCV call.
286 */
287static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
288{
289 register unsigned long reg0 asm ("0");
290 register unsigned long reg1 asm ("1");
291 int ccode;
292
293 reg0 = command;
294 reg1 = (unsigned long)parm;
295 asm volatile(
296 " .long 0xb2f01000\n"
297 " ipm %0\n"
298 " srl %0,28\n"
299 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
300 : "m" (*parm) : "cc");
301 return ccode;
302}
303
304static inline int iucv_call_b2f0(int command, union iucv_param *parm)
305{
306 int ccode;
307
308 ccode = __iucv_call_b2f0(command, parm);
309 return ccode == 1 ? parm->ctrl.iprcode : ccode;
310}
311
312/**
313 * iucv_query_maxconn
314 *
315 * Determines the maximum number of connections that may be established.
316 *
317 * Returns the maximum number of connections or -EPERM is IUCV is not
318 * available.
319 */
320static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
321{
322 register unsigned long reg0 asm ("0");
323 register unsigned long reg1 asm ("1");
324 int ccode;
325
326 reg0 = IUCV_QUERY;
327 reg1 = (unsigned long) param;
328 asm volatile (
329 " .long 0xb2f01000\n"
330 " ipm %0\n"
331 " srl %0,28\n"
332 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
333 *max_pathid = reg1;
334 return ccode;
335}
336
337static int iucv_query_maxconn(void)
338{
339 unsigned long max_pathid;
340 void *param;
341 int ccode;
342
343 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
344 if (!param)
345 return -ENOMEM;
346 ccode = __iucv_query_maxconn(param, &max_pathid);
347 if (ccode == 0)
348 iucv_max_pathid = max_pathid;
349 kfree(param);
350 return ccode ? -EPERM : 0;
351}
352
353/**
354 * iucv_allow_cpu
355 * @data: unused
356 *
357 * Allow iucv interrupts on this cpu.
358 */
359static void iucv_allow_cpu(void *data)
360{
361 int cpu = smp_processor_id();
362 union iucv_param *parm;
363
364 /*
365 * Enable all iucv interrupts.
366 * ipmask contains bits for the different interrupts
367 * 0x80 - Flag to allow nonpriority message pending interrupts
368 * 0x40 - Flag to allow priority message pending interrupts
369 * 0x20 - Flag to allow nonpriority message completion interrupts
370 * 0x10 - Flag to allow priority message completion interrupts
371 * 0x08 - Flag to allow IUCV control interrupts
372 */
373 parm = iucv_param_irq[cpu];
374 memset(parm, 0, sizeof(union iucv_param));
375 parm->set_mask.ipmask = 0xf8;
376 iucv_call_b2f0(IUCV_SETMASK, parm);
377
378 /*
379 * Enable all iucv control interrupts.
380 * ipmask contains bits for the different interrupts
381 * 0x80 - Flag to allow pending connections interrupts
382 * 0x40 - Flag to allow connection complete interrupts
383 * 0x20 - Flag to allow connection severed interrupts
384 * 0x10 - Flag to allow connection quiesced interrupts
385 * 0x08 - Flag to allow connection resumed interrupts
386 */
387 memset(parm, 0, sizeof(union iucv_param));
388 parm->set_mask.ipmask = 0xf8;
389 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
390 /* Set indication that iucv interrupts are allowed for this cpu. */
391 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
392}
393
394/**
395 * iucv_block_cpu
396 * @data: unused
397 *
398 * Block iucv interrupts on this cpu.
399 */
400static void iucv_block_cpu(void *data)
401{
402 int cpu = smp_processor_id();
403 union iucv_param *parm;
404
405 /* Disable all iucv interrupts. */
406 parm = iucv_param_irq[cpu];
407 memset(parm, 0, sizeof(union iucv_param));
408 iucv_call_b2f0(IUCV_SETMASK, parm);
409
410 /* Clear indication that iucv interrupts are allowed for this cpu. */
411 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
412}
413
414/**
415 * iucv_declare_cpu
416 * @data: unused
417 *
418 * Declare a interrupt buffer on this cpu.
419 */
420static void iucv_declare_cpu(void *data)
421{
422 int cpu = smp_processor_id();
423 union iucv_param *parm;
424 int rc;
425
426 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
427 return;
428
429 /* Declare interrupt buffer. */
430 parm = iucv_param_irq[cpu];
431 memset(parm, 0, sizeof(union iucv_param));
432 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
433 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
434 if (rc) {
435 char *err = "Unknown";
436 switch (rc) {
437 case 0x03:
438 err = "Directory error";
439 break;
440 case 0x0a:
441 err = "Invalid length";
442 break;
443 case 0x13:
444 err = "Buffer already exists";
445 break;
446 case 0x3e:
447 err = "Buffer overlap";
448 break;
449 case 0x5c:
450 err = "Paging or storage error";
451 break;
452 }
453 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
454 cpu, rc, err);
455 return;
456 }
457
458 /* Set indication that an iucv buffer exists for this cpu. */
459 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
460
461 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
462 /* Enable iucv interrupts on this cpu. */
463 iucv_allow_cpu(NULL);
464 else
465 /* Disable iucv interrupts on this cpu. */
466 iucv_block_cpu(NULL);
467}
468
469/**
470 * iucv_retrieve_cpu
471 * @data: unused
472 *
473 * Retrieve interrupt buffer on this cpu.
474 */
475static void iucv_retrieve_cpu(void *data)
476{
477 int cpu = smp_processor_id();
478 union iucv_param *parm;
479
480 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
481 return;
482
483 /* Block iucv interrupts. */
484 iucv_block_cpu(NULL);
485
486 /* Retrieve interrupt buffer. */
487 parm = iucv_param_irq[cpu];
488 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
489
490 /* Clear indication that an iucv buffer exists for this cpu. */
491 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
492}
493
494/**
495 * iucv_setmask_smp
496 *
497 * Allow iucv interrupts on all cpus.
498 */
499static void iucv_setmask_mp(void)
500{
501 int cpu;
502
503 get_online_cpus();
504 for_each_online_cpu(cpu)
505 /* Enable all cpus with a declared buffer. */
506 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
507 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
508 smp_call_function_single(cpu, iucv_allow_cpu,
509 NULL, 1);
510 put_online_cpus();
511}
512
513/**
514 * iucv_setmask_up
515 *
516 * Allow iucv interrupts on a single cpu.
517 */
518static void iucv_setmask_up(void)
519{
520 cpumask_t cpumask;
521 int cpu;
522
523 /* Disable all cpu but the first in cpu_irq_cpumask. */
524 cpumask_copy(&cpumask, &iucv_irq_cpumask);
525 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
526 for_each_cpu(cpu, &cpumask)
527 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
528}
529
530/**
531 * iucv_enable
532 *
533 * This function makes iucv ready for use. It allocates the pathid
534 * table, declares an iucv interrupt buffer and enables the iucv
535 * interrupts. Called when the first user has registered an iucv
536 * handler.
537 */
538static int iucv_enable(void)
539{
540 size_t alloc_size;
541 int cpu, rc;
542
543 get_online_cpus();
544 rc = -ENOMEM;
545 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
546 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
547 if (!iucv_path_table)
548 goto out;
549 /* Declare per cpu buffers. */
550 rc = -EIO;
551 for_each_online_cpu(cpu)
552 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
553 if (cpumask_empty(&iucv_buffer_cpumask))
554 /* No cpu could declare an iucv buffer. */
555 goto out;
556 put_online_cpus();
557 return 0;
558out:
559 kfree(iucv_path_table);
560 iucv_path_table = NULL;
561 put_online_cpus();
562 return rc;
563}
564
565/**
566 * iucv_disable
567 *
568 * This function shuts down iucv. It disables iucv interrupts, retrieves
569 * the iucv interrupt buffer and frees the pathid table. Called after the
570 * last user unregister its iucv handler.
571 */
572static void iucv_disable(void)
573{
574 get_online_cpus();
575 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
576 kfree(iucv_path_table);
577 iucv_path_table = NULL;
578 put_online_cpus();
579}
580
581static int iucv_cpu_dead(unsigned int cpu)
582{
583 kfree(iucv_param_irq[cpu]);
584 iucv_param_irq[cpu] = NULL;
585 kfree(iucv_param[cpu]);
586 iucv_param[cpu] = NULL;
587 kfree(iucv_irq_data[cpu]);
588 iucv_irq_data[cpu] = NULL;
589 return 0;
590}
591
592static int iucv_cpu_prepare(unsigned int cpu)
593{
594 /* Note: GFP_DMA used to get memory below 2G */
595 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
596 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
597 if (!iucv_irq_data[cpu])
598 goto out_free;
599
600 /* Allocate parameter blocks. */
601 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
602 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
603 if (!iucv_param[cpu])
604 goto out_free;
605
606 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
607 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
608 if (!iucv_param_irq[cpu])
609 goto out_free;
610
611 return 0;
612
613out_free:
614 iucv_cpu_dead(cpu);
615 return -ENOMEM;
616}
617
618static int iucv_cpu_online(unsigned int cpu)
619{
620 if (!iucv_path_table)
621 return 0;
622 iucv_declare_cpu(NULL);
623 return 0;
624}
625
626static int iucv_cpu_down_prep(unsigned int cpu)
627{
628 cpumask_t cpumask;
629
630 if (!iucv_path_table)
631 return 0;
632
633 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
634 cpumask_clear_cpu(cpu, &cpumask);
635 if (cpumask_empty(&cpumask))
636 /* Can't offline last IUCV enabled cpu. */
637 return -EINVAL;
638
639 iucv_retrieve_cpu(NULL);
640 if (!cpumask_empty(&iucv_irq_cpumask))
641 return 0;
642 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
643 iucv_allow_cpu, NULL, 1);
644 return 0;
645}
646
647/**
648 * iucv_sever_pathid
649 * @pathid: path identification number.
650 * @userdata: 16-bytes of user data.
651 *
652 * Sever an iucv path to free up the pathid. Used internally.
653 */
654static int iucv_sever_pathid(u16 pathid, u8 *userdata)
655{
656 union iucv_param *parm;
657
658 parm = iucv_param_irq[smp_processor_id()];
659 memset(parm, 0, sizeof(union iucv_param));
660 if (userdata)
661 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
662 parm->ctrl.ippathid = pathid;
663 return iucv_call_b2f0(IUCV_SEVER, parm);
664}
665
666/**
667 * __iucv_cleanup_queue
668 * @dummy: unused dummy argument
669 *
670 * Nop function called via smp_call_function to force work items from
671 * pending external iucv interrupts to the work queue.
672 */
673static void __iucv_cleanup_queue(void *dummy)
674{
675}
676
677/**
678 * iucv_cleanup_queue
679 *
680 * Function called after a path has been severed to find all remaining
681 * work items for the now stale pathid. The caller needs to hold the
682 * iucv_table_lock.
683 */
684static void iucv_cleanup_queue(void)
685{
686 struct iucv_irq_list *p, *n;
687
688 /*
689 * When a path is severed, the pathid can be reused immediately
690 * on a iucv connect or a connection pending interrupt. Remove
691 * all entries from the task queue that refer to a stale pathid
692 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
693 * or deliver the connection pending interrupt. To get all the
694 * pending interrupts force them to the work queue by calling
695 * an empty function on all cpus.
696 */
697 smp_call_function(__iucv_cleanup_queue, NULL, 1);
698 spin_lock_irq(&iucv_queue_lock);
699 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
700 /* Remove stale work items from the task queue. */
701 if (iucv_path_table[p->data.ippathid] == NULL) {
702 list_del(&p->list);
703 kfree(p);
704 }
705 }
706 spin_unlock_irq(&iucv_queue_lock);
707}
708
709/**
710 * iucv_register:
711 * @handler: address of iucv handler structure
712 * @smp: != 0 indicates that the handler can deal with out of order messages
713 *
714 * Registers a driver with IUCV.
715 *
716 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
717 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
718 */
719int iucv_register(struct iucv_handler *handler, int smp)
720{
721 int rc;
722
723 if (!iucv_available)
724 return -ENOSYS;
725 mutex_lock(&iucv_register_mutex);
726 if (!smp)
727 iucv_nonsmp_handler++;
728 if (list_empty(&iucv_handler_list)) {
729 rc = iucv_enable();
730 if (rc)
731 goto out_mutex;
732 } else if (!smp && iucv_nonsmp_handler == 1)
733 iucv_setmask_up();
734 INIT_LIST_HEAD(&handler->paths);
735
736 spin_lock_bh(&iucv_table_lock);
737 list_add_tail(&handler->list, &iucv_handler_list);
738 spin_unlock_bh(&iucv_table_lock);
739 rc = 0;
740out_mutex:
741 mutex_unlock(&iucv_register_mutex);
742 return rc;
743}
744EXPORT_SYMBOL(iucv_register);
745
746/**
747 * iucv_unregister
748 * @handler: address of iucv handler structure
749 * @smp: != 0 indicates that the handler can deal with out of order messages
750 *
751 * Unregister driver from IUCV.
752 */
753void iucv_unregister(struct iucv_handler *handler, int smp)
754{
755 struct iucv_path *p, *n;
756
757 mutex_lock(&iucv_register_mutex);
758 spin_lock_bh(&iucv_table_lock);
759 /* Remove handler from the iucv_handler_list. */
760 list_del_init(&handler->list);
761 /* Sever all pathids still referring to the handler. */
762 list_for_each_entry_safe(p, n, &handler->paths, list) {
763 iucv_sever_pathid(p->pathid, NULL);
764 iucv_path_table[p->pathid] = NULL;
765 list_del(&p->list);
766 iucv_path_free(p);
767 }
768 spin_unlock_bh(&iucv_table_lock);
769 if (!smp)
770 iucv_nonsmp_handler--;
771 if (list_empty(&iucv_handler_list))
772 iucv_disable();
773 else if (!smp && iucv_nonsmp_handler == 0)
774 iucv_setmask_mp();
775 mutex_unlock(&iucv_register_mutex);
776}
777EXPORT_SYMBOL(iucv_unregister);
778
779static int iucv_reboot_event(struct notifier_block *this,
780 unsigned long event, void *ptr)
781{
782 int i;
783
784 if (cpumask_empty(&iucv_irq_cpumask))
785 return NOTIFY_DONE;
786
787 get_online_cpus();
788 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
789 preempt_disable();
790 for (i = 0; i < iucv_max_pathid; i++) {
791 if (iucv_path_table[i])
792 iucv_sever_pathid(i, NULL);
793 }
794 preempt_enable();
795 put_online_cpus();
796 iucv_disable();
797 return NOTIFY_DONE;
798}
799
800static struct notifier_block iucv_reboot_notifier = {
801 .notifier_call = iucv_reboot_event,
802};
803
804/**
805 * iucv_path_accept
806 * @path: address of iucv path structure
807 * @handler: address of iucv handler structure
808 * @userdata: 16 bytes of data reflected to the communication partner
809 * @private: private data passed to interrupt handlers for this path
810 *
811 * This function is issued after the user received a connection pending
812 * external interrupt and now wishes to complete the IUCV communication path.
813 *
814 * Returns the result of the CP IUCV call.
815 */
816int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
817 u8 *userdata, void *private)
818{
819 union iucv_param *parm;
820 int rc;
821
822 local_bh_disable();
823 if (cpumask_empty(&iucv_buffer_cpumask)) {
824 rc = -EIO;
825 goto out;
826 }
827 /* Prepare parameter block. */
828 parm = iucv_param[smp_processor_id()];
829 memset(parm, 0, sizeof(union iucv_param));
830 parm->ctrl.ippathid = path->pathid;
831 parm->ctrl.ipmsglim = path->msglim;
832 if (userdata)
833 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
834 parm->ctrl.ipflags1 = path->flags;
835
836 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
837 if (!rc) {
838 path->private = private;
839 path->msglim = parm->ctrl.ipmsglim;
840 path->flags = parm->ctrl.ipflags1;
841 }
842out:
843 local_bh_enable();
844 return rc;
845}
846EXPORT_SYMBOL(iucv_path_accept);
847
848/**
849 * iucv_path_connect
850 * @path: address of iucv path structure
851 * @handler: address of iucv handler structure
852 * @userid: 8-byte user identification
853 * @system: 8-byte target system identification
854 * @userdata: 16 bytes of data reflected to the communication partner
855 * @private: private data passed to interrupt handlers for this path
856 *
857 * This function establishes an IUCV path. Although the connect may complete
858 * successfully, you are not able to use the path until you receive an IUCV
859 * Connection Complete external interrupt.
860 *
861 * Returns the result of the CP IUCV call.
862 */
863int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
864 u8 *userid, u8 *system, u8 *userdata,
865 void *private)
866{
867 union iucv_param *parm;
868 int rc;
869
870 spin_lock_bh(&iucv_table_lock);
871 iucv_cleanup_queue();
872 if (cpumask_empty(&iucv_buffer_cpumask)) {
873 rc = -EIO;
874 goto out;
875 }
876 parm = iucv_param[smp_processor_id()];
877 memset(parm, 0, sizeof(union iucv_param));
878 parm->ctrl.ipmsglim = path->msglim;
879 parm->ctrl.ipflags1 = path->flags;
880 if (userid) {
881 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
882 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
883 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
884 }
885 if (system) {
886 memcpy(parm->ctrl.iptarget, system,
887 sizeof(parm->ctrl.iptarget));
888 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
889 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
890 }
891 if (userdata)
892 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
893
894 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
895 if (!rc) {
896 if (parm->ctrl.ippathid < iucv_max_pathid) {
897 path->pathid = parm->ctrl.ippathid;
898 path->msglim = parm->ctrl.ipmsglim;
899 path->flags = parm->ctrl.ipflags1;
900 path->handler = handler;
901 path->private = private;
902 list_add_tail(&path->list, &handler->paths);
903 iucv_path_table[path->pathid] = path;
904 } else {
905 iucv_sever_pathid(parm->ctrl.ippathid,
906 iucv_error_pathid);
907 rc = -EIO;
908 }
909 }
910out:
911 spin_unlock_bh(&iucv_table_lock);
912 return rc;
913}
914EXPORT_SYMBOL(iucv_path_connect);
915
916/**
917 * iucv_path_quiesce:
918 * @path: address of iucv path structure
919 * @userdata: 16 bytes of data reflected to the communication partner
920 *
921 * This function temporarily suspends incoming messages on an IUCV path.
922 * You can later reactivate the path by invoking the iucv_resume function.
923 *
924 * Returns the result from the CP IUCV call.
925 */
926int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
927{
928 union iucv_param *parm;
929 int rc;
930
931 local_bh_disable();
932 if (cpumask_empty(&iucv_buffer_cpumask)) {
933 rc = -EIO;
934 goto out;
935 }
936 parm = iucv_param[smp_processor_id()];
937 memset(parm, 0, sizeof(union iucv_param));
938 if (userdata)
939 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
940 parm->ctrl.ippathid = path->pathid;
941 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
942out:
943 local_bh_enable();
944 return rc;
945}
946EXPORT_SYMBOL(iucv_path_quiesce);
947
948/**
949 * iucv_path_resume:
950 * @path: address of iucv path structure
951 * @userdata: 16 bytes of data reflected to the communication partner
952 *
953 * This function resumes incoming messages on an IUCV path that has
954 * been stopped with iucv_path_quiesce.
955 *
956 * Returns the result from the CP IUCV call.
957 */
958int iucv_path_resume(struct iucv_path *path, u8 *userdata)
959{
960 union iucv_param *parm;
961 int rc;
962
963 local_bh_disable();
964 if (cpumask_empty(&iucv_buffer_cpumask)) {
965 rc = -EIO;
966 goto out;
967 }
968 parm = iucv_param[smp_processor_id()];
969 memset(parm, 0, sizeof(union iucv_param));
970 if (userdata)
971 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
972 parm->ctrl.ippathid = path->pathid;
973 rc = iucv_call_b2f0(IUCV_RESUME, parm);
974out:
975 local_bh_enable();
976 return rc;
977}
978
979/**
980 * iucv_path_sever
981 * @path: address of iucv path structure
982 * @userdata: 16 bytes of data reflected to the communication partner
983 *
984 * This function terminates an IUCV path.
985 *
986 * Returns the result from the CP IUCV call.
987 */
988int iucv_path_sever(struct iucv_path *path, u8 *userdata)
989{
990 int rc;
991
992 preempt_disable();
993 if (cpumask_empty(&iucv_buffer_cpumask)) {
994 rc = -EIO;
995 goto out;
996 }
997 if (iucv_active_cpu != smp_processor_id())
998 spin_lock_bh(&iucv_table_lock);
999 rc = iucv_sever_pathid(path->pathid, userdata);
1000 iucv_path_table[path->pathid] = NULL;
1001 list_del_init(&path->list);
1002 if (iucv_active_cpu != smp_processor_id())
1003 spin_unlock_bh(&iucv_table_lock);
1004out:
1005 preempt_enable();
1006 return rc;
1007}
1008EXPORT_SYMBOL(iucv_path_sever);
1009
1010/**
1011 * iucv_message_purge
1012 * @path: address of iucv path structure
1013 * @msg: address of iucv msg structure
1014 * @srccls: source class of message
1015 *
1016 * Cancels a message you have sent.
1017 *
1018 * Returns the result from the CP IUCV call.
1019 */
1020int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1021 u32 srccls)
1022{
1023 union iucv_param *parm;
1024 int rc;
1025
1026 local_bh_disable();
1027 if (cpumask_empty(&iucv_buffer_cpumask)) {
1028 rc = -EIO;
1029 goto out;
1030 }
1031 parm = iucv_param[smp_processor_id()];
1032 memset(parm, 0, sizeof(union iucv_param));
1033 parm->purge.ippathid = path->pathid;
1034 parm->purge.ipmsgid = msg->id;
1035 parm->purge.ipsrccls = srccls;
1036 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1037 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1038 if (!rc) {
1039 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1040 msg->tag = parm->purge.ipmsgtag;
1041 }
1042out:
1043 local_bh_enable();
1044 return rc;
1045}
1046EXPORT_SYMBOL(iucv_message_purge);
1047
1048/**
1049 * iucv_message_receive_iprmdata
1050 * @path: address of iucv path structure
1051 * @msg: address of iucv msg structure
1052 * @flags: how the message is received (IUCV_IPBUFLST)
1053 * @buffer: address of data buffer or address of struct iucv_array
1054 * @size: length of data buffer
1055 * @residual:
1056 *
1057 * Internal function used by iucv_message_receive and __iucv_message_receive
1058 * to receive RMDATA data stored in struct iucv_message.
1059 */
1060static int iucv_message_receive_iprmdata(struct iucv_path *path,
1061 struct iucv_message *msg,
1062 u8 flags, void *buffer,
1063 size_t size, size_t *residual)
1064{
1065 struct iucv_array *array;
1066 u8 *rmmsg;
1067 size_t copy;
1068
1069 /*
1070 * Message is 8 bytes long and has been stored to the
1071 * message descriptor itself.
1072 */
1073 if (residual)
1074 *residual = abs(size - 8);
1075 rmmsg = msg->rmmsg;
1076 if (flags & IUCV_IPBUFLST) {
1077 /* Copy to struct iucv_array. */
1078 size = (size < 8) ? size : 8;
1079 for (array = buffer; size > 0; array++) {
1080 copy = min_t(size_t, size, array->length);
1081 memcpy((u8 *)(addr_t) array->address,
1082 rmmsg, copy);
1083 rmmsg += copy;
1084 size -= copy;
1085 }
1086 } else {
1087 /* Copy to direct buffer. */
1088 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1089 }
1090 return 0;
1091}
1092
1093/**
1094 * __iucv_message_receive
1095 * @path: address of iucv path structure
1096 * @msg: address of iucv msg structure
1097 * @flags: how the message is received (IUCV_IPBUFLST)
1098 * @buffer: address of data buffer or address of struct iucv_array
1099 * @size: length of data buffer
1100 * @residual:
1101 *
1102 * This function receives messages that are being sent to you over
1103 * established paths. This function will deal with RMDATA messages
1104 * embedded in struct iucv_message as well.
1105 *
1106 * Locking: no locking
1107 *
1108 * Returns the result from the CP IUCV call.
1109 */
1110int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1111 u8 flags, void *buffer, size_t size, size_t *residual)
1112{
1113 union iucv_param *parm;
1114 int rc;
1115
1116 if (msg->flags & IUCV_IPRMDATA)
1117 return iucv_message_receive_iprmdata(path, msg, flags,
1118 buffer, size, residual);
1119 if (cpumask_empty(&iucv_buffer_cpumask)) {
1120 rc = -EIO;
1121 goto out;
1122 }
1123 parm = iucv_param[smp_processor_id()];
1124 memset(parm, 0, sizeof(union iucv_param));
1125 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1126 parm->db.ipbfln1f = (u32) size;
1127 parm->db.ipmsgid = msg->id;
1128 parm->db.ippathid = path->pathid;
1129 parm->db.iptrgcls = msg->class;
1130 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1131 IUCV_IPFGMID | IUCV_IPTRGCLS);
1132 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1133 if (!rc || rc == 5) {
1134 msg->flags = parm->db.ipflags1;
1135 if (residual)
1136 *residual = parm->db.ipbfln1f;
1137 }
1138out:
1139 return rc;
1140}
1141EXPORT_SYMBOL(__iucv_message_receive);
1142
1143/**
1144 * iucv_message_receive
1145 * @path: address of iucv path structure
1146 * @msg: address of iucv msg structure
1147 * @flags: how the message is received (IUCV_IPBUFLST)
1148 * @buffer: address of data buffer or address of struct iucv_array
1149 * @size: length of data buffer
1150 * @residual:
1151 *
1152 * This function receives messages that are being sent to you over
1153 * established paths. This function will deal with RMDATA messages
1154 * embedded in struct iucv_message as well.
1155 *
1156 * Locking: local_bh_enable/local_bh_disable
1157 *
1158 * Returns the result from the CP IUCV call.
1159 */
1160int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1161 u8 flags, void *buffer, size_t size, size_t *residual)
1162{
1163 int rc;
1164
1165 if (msg->flags & IUCV_IPRMDATA)
1166 return iucv_message_receive_iprmdata(path, msg, flags,
1167 buffer, size, residual);
1168 local_bh_disable();
1169 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1170 local_bh_enable();
1171 return rc;
1172}
1173EXPORT_SYMBOL(iucv_message_receive);
1174
1175/**
1176 * iucv_message_reject
1177 * @path: address of iucv path structure
1178 * @msg: address of iucv msg structure
1179 *
1180 * The reject function refuses a specified message. Between the time you
1181 * are notified of a message and the time that you complete the message,
1182 * the message may be rejected.
1183 *
1184 * Returns the result from the CP IUCV call.
1185 */
1186int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1187{
1188 union iucv_param *parm;
1189 int rc;
1190
1191 local_bh_disable();
1192 if (cpumask_empty(&iucv_buffer_cpumask)) {
1193 rc = -EIO;
1194 goto out;
1195 }
1196 parm = iucv_param[smp_processor_id()];
1197 memset(parm, 0, sizeof(union iucv_param));
1198 parm->db.ippathid = path->pathid;
1199 parm->db.ipmsgid = msg->id;
1200 parm->db.iptrgcls = msg->class;
1201 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1202 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1203out:
1204 local_bh_enable();
1205 return rc;
1206}
1207EXPORT_SYMBOL(iucv_message_reject);
1208
1209/**
1210 * iucv_message_reply
1211 * @path: address of iucv path structure
1212 * @msg: address of iucv msg structure
1213 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1214 * @reply: address of reply data buffer or address of struct iucv_array
1215 * @size: length of reply data buffer
1216 *
1217 * This function responds to the two-way messages that you receive. You
1218 * must identify completely the message to which you wish to reply. ie,
1219 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1220 * the parameter list.
1221 *
1222 * Returns the result from the CP IUCV call.
1223 */
1224int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1225 u8 flags, void *reply, size_t size)
1226{
1227 union iucv_param *parm;
1228 int rc;
1229
1230 local_bh_disable();
1231 if (cpumask_empty(&iucv_buffer_cpumask)) {
1232 rc = -EIO;
1233 goto out;
1234 }
1235 parm = iucv_param[smp_processor_id()];
1236 memset(parm, 0, sizeof(union iucv_param));
1237 if (flags & IUCV_IPRMDATA) {
1238 parm->dpl.ippathid = path->pathid;
1239 parm->dpl.ipflags1 = flags;
1240 parm->dpl.ipmsgid = msg->id;
1241 parm->dpl.iptrgcls = msg->class;
1242 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1243 } else {
1244 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1245 parm->db.ipbfln1f = (u32) size;
1246 parm->db.ippathid = path->pathid;
1247 parm->db.ipflags1 = flags;
1248 parm->db.ipmsgid = msg->id;
1249 parm->db.iptrgcls = msg->class;
1250 }
1251 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1252out:
1253 local_bh_enable();
1254 return rc;
1255}
1256EXPORT_SYMBOL(iucv_message_reply);
1257
1258/**
1259 * __iucv_message_send
1260 * @path: address of iucv path structure
1261 * @msg: address of iucv msg structure
1262 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1263 * @srccls: source class of message
1264 * @buffer: address of send buffer or address of struct iucv_array
1265 * @size: length of send buffer
1266 *
1267 * This function transmits data to another application. Data to be
1268 * transmitted is in a buffer and this is a one-way message and the
1269 * receiver will not reply to the message.
1270 *
1271 * Locking: no locking
1272 *
1273 * Returns the result from the CP IUCV call.
1274 */
1275int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1276 u8 flags, u32 srccls, void *buffer, size_t size)
1277{
1278 union iucv_param *parm;
1279 int rc;
1280
1281 if (cpumask_empty(&iucv_buffer_cpumask)) {
1282 rc = -EIO;
1283 goto out;
1284 }
1285 parm = iucv_param[smp_processor_id()];
1286 memset(parm, 0, sizeof(union iucv_param));
1287 if (flags & IUCV_IPRMDATA) {
1288 /* Message of 8 bytes can be placed into the parameter list. */
1289 parm->dpl.ippathid = path->pathid;
1290 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1291 parm->dpl.iptrgcls = msg->class;
1292 parm->dpl.ipsrccls = srccls;
1293 parm->dpl.ipmsgtag = msg->tag;
1294 memcpy(parm->dpl.iprmmsg, buffer, 8);
1295 } else {
1296 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1297 parm->db.ipbfln1f = (u32) size;
1298 parm->db.ippathid = path->pathid;
1299 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1300 parm->db.iptrgcls = msg->class;
1301 parm->db.ipsrccls = srccls;
1302 parm->db.ipmsgtag = msg->tag;
1303 }
1304 rc = iucv_call_b2f0(IUCV_SEND, parm);
1305 if (!rc)
1306 msg->id = parm->db.ipmsgid;
1307out:
1308 return rc;
1309}
1310EXPORT_SYMBOL(__iucv_message_send);
1311
1312/**
1313 * iucv_message_send
1314 * @path: address of iucv path structure
1315 * @msg: address of iucv msg structure
1316 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1317 * @srccls: source class of message
1318 * @buffer: address of send buffer or address of struct iucv_array
1319 * @size: length of send buffer
1320 *
1321 * This function transmits data to another application. Data to be
1322 * transmitted is in a buffer and this is a one-way message and the
1323 * receiver will not reply to the message.
1324 *
1325 * Locking: local_bh_enable/local_bh_disable
1326 *
1327 * Returns the result from the CP IUCV call.
1328 */
1329int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1330 u8 flags, u32 srccls, void *buffer, size_t size)
1331{
1332 int rc;
1333
1334 local_bh_disable();
1335 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1336 local_bh_enable();
1337 return rc;
1338}
1339EXPORT_SYMBOL(iucv_message_send);
1340
1341/**
1342 * iucv_message_send2way
1343 * @path: address of iucv path structure
1344 * @msg: address of iucv msg structure
1345 * @flags: how the message is sent and the reply is received
1346 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1347 * @srccls: source class of message
1348 * @buffer: address of send buffer or address of struct iucv_array
1349 * @size: length of send buffer
1350 * @ansbuf: address of answer buffer or address of struct iucv_array
1351 * @asize: size of reply buffer
1352 *
1353 * This function transmits data to another application. Data to be
1354 * transmitted is in a buffer. The receiver of the send is expected to
1355 * reply to the message and a buffer is provided into which IUCV moves
1356 * the reply to this message.
1357 *
1358 * Returns the result from the CP IUCV call.
1359 */
1360int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1361 u8 flags, u32 srccls, void *buffer, size_t size,
1362 void *answer, size_t asize, size_t *residual)
1363{
1364 union iucv_param *parm;
1365 int rc;
1366
1367 local_bh_disable();
1368 if (cpumask_empty(&iucv_buffer_cpumask)) {
1369 rc = -EIO;
1370 goto out;
1371 }
1372 parm = iucv_param[smp_processor_id()];
1373 memset(parm, 0, sizeof(union iucv_param));
1374 if (flags & IUCV_IPRMDATA) {
1375 parm->dpl.ippathid = path->pathid;
1376 parm->dpl.ipflags1 = path->flags; /* priority message */
1377 parm->dpl.iptrgcls = msg->class;
1378 parm->dpl.ipsrccls = srccls;
1379 parm->dpl.ipmsgtag = msg->tag;
1380 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1381 parm->dpl.ipbfln2f = (u32) asize;
1382 memcpy(parm->dpl.iprmmsg, buffer, 8);
1383 } else {
1384 parm->db.ippathid = path->pathid;
1385 parm->db.ipflags1 = path->flags; /* priority message */
1386 parm->db.iptrgcls = msg->class;
1387 parm->db.ipsrccls = srccls;
1388 parm->db.ipmsgtag = msg->tag;
1389 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1390 parm->db.ipbfln1f = (u32) size;
1391 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1392 parm->db.ipbfln2f = (u32) asize;
1393 }
1394 rc = iucv_call_b2f0(IUCV_SEND, parm);
1395 if (!rc)
1396 msg->id = parm->db.ipmsgid;
1397out:
1398 local_bh_enable();
1399 return rc;
1400}
1401EXPORT_SYMBOL(iucv_message_send2way);
1402
1403/**
1404 * iucv_path_pending
1405 * @data: Pointer to external interrupt buffer
1406 *
1407 * Process connection pending work item. Called from tasklet while holding
1408 * iucv_table_lock.
1409 */
1410struct iucv_path_pending {
1411 u16 ippathid;
1412 u8 ipflags1;
1413 u8 iptype;
1414 u16 ipmsglim;
1415 u16 res1;
1416 u8 ipvmid[8];
1417 u8 ipuser[16];
1418 u32 res3;
1419 u8 ippollfg;
1420 u8 res4[3];
1421} __packed;
1422
1423static void iucv_path_pending(struct iucv_irq_data *data)
1424{
1425 struct iucv_path_pending *ipp = (void *) data;
1426 struct iucv_handler *handler;
1427 struct iucv_path *path;
1428 char *error;
1429
1430 BUG_ON(iucv_path_table[ipp->ippathid]);
1431 /* New pathid, handler found. Create a new path struct. */
1432 error = iucv_error_no_memory;
1433 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1434 if (!path)
1435 goto out_sever;
1436 path->pathid = ipp->ippathid;
1437 iucv_path_table[path->pathid] = path;
1438 EBCASC(ipp->ipvmid, 8);
1439
1440 /* Call registered handler until one is found that wants the path. */
1441 list_for_each_entry(handler, &iucv_handler_list, list) {
1442 if (!handler->path_pending)
1443 continue;
1444 /*
1445 * Add path to handler to allow a call to iucv_path_sever
1446 * inside the path_pending function. If the handler returns
1447 * an error remove the path from the handler again.
1448 */
1449 list_add(&path->list, &handler->paths);
1450 path->handler = handler;
1451 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1452 return;
1453 list_del(&path->list);
1454 path->handler = NULL;
1455 }
1456 /* No handler wanted the path. */
1457 iucv_path_table[path->pathid] = NULL;
1458 iucv_path_free(path);
1459 error = iucv_error_no_listener;
1460out_sever:
1461 iucv_sever_pathid(ipp->ippathid, error);
1462}
1463
1464/**
1465 * iucv_path_complete
1466 * @data: Pointer to external interrupt buffer
1467 *
1468 * Process connection complete work item. Called from tasklet while holding
1469 * iucv_table_lock.
1470 */
1471struct iucv_path_complete {
1472 u16 ippathid;
1473 u8 ipflags1;
1474 u8 iptype;
1475 u16 ipmsglim;
1476 u16 res1;
1477 u8 res2[8];
1478 u8 ipuser[16];
1479 u32 res3;
1480 u8 ippollfg;
1481 u8 res4[3];
1482} __packed;
1483
1484static void iucv_path_complete(struct iucv_irq_data *data)
1485{
1486 struct iucv_path_complete *ipc = (void *) data;
1487 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1488
1489 if (path)
1490 path->flags = ipc->ipflags1;
1491 if (path && path->handler && path->handler->path_complete)
1492 path->handler->path_complete(path, ipc->ipuser);
1493}
1494
1495/**
1496 * iucv_path_severed
1497 * @data: Pointer to external interrupt buffer
1498 *
1499 * Process connection severed work item. Called from tasklet while holding
1500 * iucv_table_lock.
1501 */
1502struct iucv_path_severed {
1503 u16 ippathid;
1504 u8 res1;
1505 u8 iptype;
1506 u32 res2;
1507 u8 res3[8];
1508 u8 ipuser[16];
1509 u32 res4;
1510 u8 ippollfg;
1511 u8 res5[3];
1512} __packed;
1513
1514static void iucv_path_severed(struct iucv_irq_data *data)
1515{
1516 struct iucv_path_severed *ips = (void *) data;
1517 struct iucv_path *path = iucv_path_table[ips->ippathid];
1518
1519 if (!path || !path->handler) /* Already severed */
1520 return;
1521 if (path->handler->path_severed)
1522 path->handler->path_severed(path, ips->ipuser);
1523 else {
1524 iucv_sever_pathid(path->pathid, NULL);
1525 iucv_path_table[path->pathid] = NULL;
1526 list_del(&path->list);
1527 iucv_path_free(path);
1528 }
1529}
1530
1531/**
1532 * iucv_path_quiesced
1533 * @data: Pointer to external interrupt buffer
1534 *
1535 * Process connection quiesced work item. Called from tasklet while holding
1536 * iucv_table_lock.
1537 */
1538struct iucv_path_quiesced {
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} __packed;
1549
1550static void iucv_path_quiesced(struct iucv_irq_data *data)
1551{
1552 struct iucv_path_quiesced *ipq = (void *) data;
1553 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1554
1555 if (path && path->handler && path->handler->path_quiesced)
1556 path->handler->path_quiesced(path, ipq->ipuser);
1557}
1558
1559/**
1560 * iucv_path_resumed
1561 * @data: Pointer to external interrupt buffer
1562 *
1563 * Process connection resumed work item. Called from tasklet while holding
1564 * iucv_table_lock.
1565 */
1566struct iucv_path_resumed {
1567 u16 ippathid;
1568 u8 res1;
1569 u8 iptype;
1570 u32 res2;
1571 u8 res3[8];
1572 u8 ipuser[16];
1573 u32 res4;
1574 u8 ippollfg;
1575 u8 res5[3];
1576} __packed;
1577
1578static void iucv_path_resumed(struct iucv_irq_data *data)
1579{
1580 struct iucv_path_resumed *ipr = (void *) data;
1581 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1582
1583 if (path && path->handler && path->handler->path_resumed)
1584 path->handler->path_resumed(path, ipr->ipuser);
1585}
1586
1587/**
1588 * iucv_message_complete
1589 * @data: Pointer to external interrupt buffer
1590 *
1591 * Process message complete work item. Called from tasklet while holding
1592 * iucv_table_lock.
1593 */
1594struct iucv_message_complete {
1595 u16 ippathid;
1596 u8 ipflags1;
1597 u8 iptype;
1598 u32 ipmsgid;
1599 u32 ipaudit;
1600 u8 iprmmsg[8];
1601 u32 ipsrccls;
1602 u32 ipmsgtag;
1603 u32 res;
1604 u32 ipbfln2f;
1605 u8 ippollfg;
1606 u8 res2[3];
1607} __packed;
1608
1609static void iucv_message_complete(struct iucv_irq_data *data)
1610{
1611 struct iucv_message_complete *imc = (void *) data;
1612 struct iucv_path *path = iucv_path_table[imc->ippathid];
1613 struct iucv_message msg;
1614
1615 if (path && path->handler && path->handler->message_complete) {
1616 msg.flags = imc->ipflags1;
1617 msg.id = imc->ipmsgid;
1618 msg.audit = imc->ipaudit;
1619 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1620 msg.class = imc->ipsrccls;
1621 msg.tag = imc->ipmsgtag;
1622 msg.length = imc->ipbfln2f;
1623 path->handler->message_complete(path, &msg);
1624 }
1625}
1626
1627/**
1628 * iucv_message_pending
1629 * @data: Pointer to external interrupt buffer
1630 *
1631 * Process message pending work item. Called from tasklet while holding
1632 * iucv_table_lock.
1633 */
1634struct iucv_message_pending {
1635 u16 ippathid;
1636 u8 ipflags1;
1637 u8 iptype;
1638 u32 ipmsgid;
1639 u32 iptrgcls;
1640 union {
1641 u32 iprmmsg1_u32;
1642 u8 iprmmsg1[4];
1643 } ln1msg1;
1644 union {
1645 u32 ipbfln1f;
1646 u8 iprmmsg2[4];
1647 } ln1msg2;
1648 u32 res1[3];
1649 u32 ipbfln2f;
1650 u8 ippollfg;
1651 u8 res2[3];
1652} __packed;
1653
1654static void iucv_message_pending(struct iucv_irq_data *data)
1655{
1656 struct iucv_message_pending *imp = (void *) data;
1657 struct iucv_path *path = iucv_path_table[imp->ippathid];
1658 struct iucv_message msg;
1659
1660 if (path && path->handler && path->handler->message_pending) {
1661 msg.flags = imp->ipflags1;
1662 msg.id = imp->ipmsgid;
1663 msg.class = imp->iptrgcls;
1664 if (imp->ipflags1 & IUCV_IPRMDATA) {
1665 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1666 msg.length = 8;
1667 } else
1668 msg.length = imp->ln1msg2.ipbfln1f;
1669 msg.reply_size = imp->ipbfln2f;
1670 path->handler->message_pending(path, &msg);
1671 }
1672}
1673
1674/**
1675 * iucv_tasklet_fn:
1676 *
1677 * This tasklet loops over the queue of irq buffers created by
1678 * iucv_external_interrupt, calls the appropriate action handler
1679 * and then frees the buffer.
1680 */
1681static void iucv_tasklet_fn(unsigned long ignored)
1682{
1683 typedef void iucv_irq_fn(struct iucv_irq_data *);
1684 static iucv_irq_fn *irq_fn[] = {
1685 [0x02] = iucv_path_complete,
1686 [0x03] = iucv_path_severed,
1687 [0x04] = iucv_path_quiesced,
1688 [0x05] = iucv_path_resumed,
1689 [0x06] = iucv_message_complete,
1690 [0x07] = iucv_message_complete,
1691 [0x08] = iucv_message_pending,
1692 [0x09] = iucv_message_pending,
1693 };
1694 LIST_HEAD(task_queue);
1695 struct iucv_irq_list *p, *n;
1696
1697 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1698 if (!spin_trylock(&iucv_table_lock)) {
1699 tasklet_schedule(&iucv_tasklet);
1700 return;
1701 }
1702 iucv_active_cpu = smp_processor_id();
1703
1704 spin_lock_irq(&iucv_queue_lock);
1705 list_splice_init(&iucv_task_queue, &task_queue);
1706 spin_unlock_irq(&iucv_queue_lock);
1707
1708 list_for_each_entry_safe(p, n, &task_queue, list) {
1709 list_del_init(&p->list);
1710 irq_fn[p->data.iptype](&p->data);
1711 kfree(p);
1712 }
1713
1714 iucv_active_cpu = -1;
1715 spin_unlock(&iucv_table_lock);
1716}
1717
1718/**
1719 * iucv_work_fn:
1720 *
1721 * This work function loops over the queue of path pending irq blocks
1722 * created by iucv_external_interrupt, calls the appropriate action
1723 * handler and then frees the buffer.
1724 */
1725static void iucv_work_fn(struct work_struct *work)
1726{
1727 LIST_HEAD(work_queue);
1728 struct iucv_irq_list *p, *n;
1729
1730 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1731 spin_lock_bh(&iucv_table_lock);
1732 iucv_active_cpu = smp_processor_id();
1733
1734 spin_lock_irq(&iucv_queue_lock);
1735 list_splice_init(&iucv_work_queue, &work_queue);
1736 spin_unlock_irq(&iucv_queue_lock);
1737
1738 iucv_cleanup_queue();
1739 list_for_each_entry_safe(p, n, &work_queue, list) {
1740 list_del_init(&p->list);
1741 iucv_path_pending(&p->data);
1742 kfree(p);
1743 }
1744
1745 iucv_active_cpu = -1;
1746 spin_unlock_bh(&iucv_table_lock);
1747}
1748
1749/**
1750 * iucv_external_interrupt
1751 * @code: irq code
1752 *
1753 * Handles external interrupts coming in from CP.
1754 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1755 */
1756static void iucv_external_interrupt(struct ext_code ext_code,
1757 unsigned int param32, unsigned long param64)
1758{
1759 struct iucv_irq_data *p;
1760 struct iucv_irq_list *work;
1761
1762 inc_irq_stat(IRQEXT_IUC);
1763 p = iucv_irq_data[smp_processor_id()];
1764 if (p->ippathid >= iucv_max_pathid) {
1765 WARN_ON(p->ippathid >= iucv_max_pathid);
1766 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1767 return;
1768 }
1769 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1770 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1771 if (!work) {
1772 pr_warn("iucv_external_interrupt: out of memory\n");
1773 return;
1774 }
1775 memcpy(&work->data, p, sizeof(work->data));
1776 spin_lock(&iucv_queue_lock);
1777 if (p->iptype == 0x01) {
1778 /* Path pending interrupt. */
1779 list_add_tail(&work->list, &iucv_work_queue);
1780 schedule_work(&iucv_work);
1781 } else {
1782 /* The other interrupts. */
1783 list_add_tail(&work->list, &iucv_task_queue);
1784 tasklet_schedule(&iucv_tasklet);
1785 }
1786 spin_unlock(&iucv_queue_lock);
1787}
1788
1789struct iucv_interface iucv_if = {
1790 .message_receive = iucv_message_receive,
1791 .__message_receive = __iucv_message_receive,
1792 .message_reply = iucv_message_reply,
1793 .message_reject = iucv_message_reject,
1794 .message_send = iucv_message_send,
1795 .__message_send = __iucv_message_send,
1796 .message_send2way = iucv_message_send2way,
1797 .message_purge = iucv_message_purge,
1798 .path_accept = iucv_path_accept,
1799 .path_connect = iucv_path_connect,
1800 .path_quiesce = iucv_path_quiesce,
1801 .path_resume = iucv_path_resume,
1802 .path_sever = iucv_path_sever,
1803 .iucv_register = iucv_register,
1804 .iucv_unregister = iucv_unregister,
1805 .bus = NULL,
1806 .root = NULL,
1807};
1808EXPORT_SYMBOL(iucv_if);
1809
1810static enum cpuhp_state iucv_online;
1811/**
1812 * iucv_init
1813 *
1814 * Allocates and initializes various data structures.
1815 */
1816static int __init iucv_init(void)
1817{
1818 int rc;
1819
1820 if (!MACHINE_IS_VM) {
1821 rc = -EPROTONOSUPPORT;
1822 goto out;
1823 }
1824 ctl_set_bit(0, 1);
1825 rc = iucv_query_maxconn();
1826 if (rc)
1827 goto out_ctl;
1828 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1829 if (rc)
1830 goto out_ctl;
1831 iucv_root = root_device_register("iucv");
1832 if (IS_ERR(iucv_root)) {
1833 rc = PTR_ERR(iucv_root);
1834 goto out_int;
1835 }
1836
1837 rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
1838 iucv_cpu_prepare, iucv_cpu_dead);
1839 if (rc)
1840 goto out_dev;
1841 rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
1842 iucv_cpu_online, iucv_cpu_down_prep);
1843 if (rc < 0)
1844 goto out_prep;
1845 iucv_online = rc;
1846
1847 rc = register_reboot_notifier(&iucv_reboot_notifier);
1848 if (rc)
1849 goto out_remove_hp;
1850 ASCEBC(iucv_error_no_listener, 16);
1851 ASCEBC(iucv_error_no_memory, 16);
1852 ASCEBC(iucv_error_pathid, 16);
1853 iucv_available = 1;
1854 rc = bus_register(&iucv_bus);
1855 if (rc)
1856 goto out_reboot;
1857 iucv_if.root = iucv_root;
1858 iucv_if.bus = &iucv_bus;
1859 return 0;
1860
1861out_reboot:
1862 unregister_reboot_notifier(&iucv_reboot_notifier);
1863out_remove_hp:
1864 cpuhp_remove_state(iucv_online);
1865out_prep:
1866 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1867out_dev:
1868 root_device_unregister(iucv_root);
1869out_int:
1870 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1871out_ctl:
1872 ctl_clear_bit(0, 1);
1873out:
1874 return rc;
1875}
1876
1877/**
1878 * iucv_exit
1879 *
1880 * Frees everything allocated from iucv_init.
1881 */
1882static void __exit iucv_exit(void)
1883{
1884 struct iucv_irq_list *p, *n;
1885
1886 spin_lock_irq(&iucv_queue_lock);
1887 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1888 kfree(p);
1889 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1890 kfree(p);
1891 spin_unlock_irq(&iucv_queue_lock);
1892 unregister_reboot_notifier(&iucv_reboot_notifier);
1893
1894 cpuhp_remove_state_nocalls(iucv_online);
1895 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1896 root_device_unregister(iucv_root);
1897 bus_unregister(&iucv_bus);
1898 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1899}
1900
1901subsys_initcall(iucv_init);
1902module_exit(iucv_exit);
1903
1904MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1905MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1906MODULE_LICENSE("GPL");
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/kernel_stat.h>
40#include <linux/module.h>
41#include <linux/moduleparam.h>
42#include <linux/spinlock.h>
43#include <linux/kernel.h>
44#include <linux/slab.h>
45#include <linux/init.h>
46#include <linux/interrupt.h>
47#include <linux/list.h>
48#include <linux/errno.h>
49#include <linux/err.h>
50#include <linux/device.h>
51#include <linux/cpu.h>
52#include <linux/reboot.h>
53#include <net/iucv/iucv.h>
54#include <linux/atomic.h>
55#include <asm/ebcdic.h>
56#include <asm/io.h>
57#include <asm/irq.h>
58#include <asm/smp.h>
59
60/*
61 * FLAGS:
62 * All flags are defined in the field IPFLAGS1 of each function
63 * and can be found in CP Programming Services.
64 * IPSRCCLS - Indicates you have specified a source class.
65 * IPTRGCLS - Indicates you have specified a target class.
66 * IPFGPID - Indicates you have specified a pathid.
67 * IPFGMID - Indicates you have specified a message ID.
68 * IPNORPY - Indicates a one-way message. No reply expected.
69 * IPALL - Indicates that all paths are affected.
70 */
71#define IUCV_IPSRCCLS 0x01
72#define IUCV_IPTRGCLS 0x01
73#define IUCV_IPFGPID 0x02
74#define IUCV_IPFGMID 0x04
75#define IUCV_IPNORPY 0x10
76#define IUCV_IPALL 0x80
77
78static int iucv_bus_match(struct device *dev, struct device_driver *drv)
79{
80 return 0;
81}
82
83enum iucv_pm_states {
84 IUCV_PM_INITIAL = 0,
85 IUCV_PM_FREEZING = 1,
86 IUCV_PM_THAWING = 2,
87 IUCV_PM_RESTORING = 3,
88};
89static enum iucv_pm_states iucv_pm_state;
90
91static int iucv_pm_prepare(struct device *);
92static void iucv_pm_complete(struct device *);
93static int iucv_pm_freeze(struct device *);
94static int iucv_pm_thaw(struct device *);
95static int iucv_pm_restore(struct device *);
96
97static const struct dev_pm_ops iucv_pm_ops = {
98 .prepare = iucv_pm_prepare,
99 .complete = iucv_pm_complete,
100 .freeze = iucv_pm_freeze,
101 .thaw = iucv_pm_thaw,
102 .restore = iucv_pm_restore,
103};
104
105struct bus_type iucv_bus = {
106 .name = "iucv",
107 .match = iucv_bus_match,
108 .pm = &iucv_pm_ops,
109};
110EXPORT_SYMBOL(iucv_bus);
111
112struct device *iucv_root;
113EXPORT_SYMBOL(iucv_root);
114
115static int iucv_available;
116
117/* General IUCV interrupt structure */
118struct iucv_irq_data {
119 u16 ippathid;
120 u8 ipflags1;
121 u8 iptype;
122 u32 res2[8];
123};
124
125struct iucv_irq_list {
126 struct list_head list;
127 struct iucv_irq_data data;
128};
129
130static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
131static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
132static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
133
134/*
135 * Queue of interrupt buffers lock for delivery via the tasklet
136 * (fast but can't call smp_call_function).
137 */
138static LIST_HEAD(iucv_task_queue);
139
140/*
141 * The tasklet for fast delivery of iucv interrupts.
142 */
143static void iucv_tasklet_fn(unsigned long);
144static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
145
146/*
147 * Queue of interrupt buffers for delivery via a work queue
148 * (slower but can call smp_call_function).
149 */
150static LIST_HEAD(iucv_work_queue);
151
152/*
153 * The work element to deliver path pending interrupts.
154 */
155static void iucv_work_fn(struct work_struct *work);
156static DECLARE_WORK(iucv_work, iucv_work_fn);
157
158/*
159 * Spinlock protecting task and work queue.
160 */
161static DEFINE_SPINLOCK(iucv_queue_lock);
162
163enum iucv_command_codes {
164 IUCV_QUERY = 0,
165 IUCV_RETRIEVE_BUFFER = 2,
166 IUCV_SEND = 4,
167 IUCV_RECEIVE = 5,
168 IUCV_REPLY = 6,
169 IUCV_REJECT = 8,
170 IUCV_PURGE = 9,
171 IUCV_ACCEPT = 10,
172 IUCV_CONNECT = 11,
173 IUCV_DECLARE_BUFFER = 12,
174 IUCV_QUIESCE = 13,
175 IUCV_RESUME = 14,
176 IUCV_SEVER = 15,
177 IUCV_SETMASK = 16,
178 IUCV_SETCONTROLMASK = 17,
179};
180
181/*
182 * Error messages that are used with the iucv_sever function. They get
183 * converted to EBCDIC.
184 */
185static char iucv_error_no_listener[16] = "NO LISTENER";
186static char iucv_error_no_memory[16] = "NO MEMORY";
187static char iucv_error_pathid[16] = "INVALID PATHID";
188
189/*
190 * iucv_handler_list: List of registered handlers.
191 */
192static LIST_HEAD(iucv_handler_list);
193
194/*
195 * iucv_path_table: an array of iucv_path structures.
196 */
197static struct iucv_path **iucv_path_table;
198static unsigned long iucv_max_pathid;
199
200/*
201 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
202 */
203static DEFINE_SPINLOCK(iucv_table_lock);
204
205/*
206 * iucv_active_cpu: contains the number of the cpu executing the tasklet
207 * or the work handler. Needed for iucv_path_sever called from tasklet.
208 */
209static int iucv_active_cpu = -1;
210
211/*
212 * Mutex and wait queue for iucv_register/iucv_unregister.
213 */
214static DEFINE_MUTEX(iucv_register_mutex);
215
216/*
217 * Counter for number of non-smp capable handlers.
218 */
219static int iucv_nonsmp_handler;
220
221/*
222 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
223 * iucv_path_quiesce and iucv_path_sever.
224 */
225struct iucv_cmd_control {
226 u16 ippathid;
227 u8 ipflags1;
228 u8 iprcode;
229 u16 ipmsglim;
230 u16 res1;
231 u8 ipvmid[8];
232 u8 ipuser[16];
233 u8 iptarget[8];
234} __attribute__ ((packed,aligned(8)));
235
236/*
237 * Data in parameter list iucv structure. Used by iucv_message_send,
238 * iucv_message_send2way and iucv_message_reply.
239 */
240struct iucv_cmd_dpl {
241 u16 ippathid;
242 u8 ipflags1;
243 u8 iprcode;
244 u32 ipmsgid;
245 u32 iptrgcls;
246 u8 iprmmsg[8];
247 u32 ipsrccls;
248 u32 ipmsgtag;
249 u32 ipbfadr2;
250 u32 ipbfln2f;
251 u32 res;
252} __attribute__ ((packed,aligned(8)));
253
254/*
255 * Data in buffer iucv structure. Used by iucv_message_receive,
256 * iucv_message_reject, iucv_message_send, iucv_message_send2way
257 * and iucv_declare_cpu.
258 */
259struct iucv_cmd_db {
260 u16 ippathid;
261 u8 ipflags1;
262 u8 iprcode;
263 u32 ipmsgid;
264 u32 iptrgcls;
265 u32 ipbfadr1;
266 u32 ipbfln1f;
267 u32 ipsrccls;
268 u32 ipmsgtag;
269 u32 ipbfadr2;
270 u32 ipbfln2f;
271 u32 res;
272} __attribute__ ((packed,aligned(8)));
273
274/*
275 * Purge message iucv structure. Used by iucv_message_purge.
276 */
277struct iucv_cmd_purge {
278 u16 ippathid;
279 u8 ipflags1;
280 u8 iprcode;
281 u32 ipmsgid;
282 u8 ipaudit[3];
283 u8 res1[5];
284 u32 res2;
285 u32 ipsrccls;
286 u32 ipmsgtag;
287 u32 res3[3];
288} __attribute__ ((packed,aligned(8)));
289
290/*
291 * Set mask iucv structure. Used by iucv_enable_cpu.
292 */
293struct iucv_cmd_set_mask {
294 u8 ipmask;
295 u8 res1[2];
296 u8 iprcode;
297 u32 res2[9];
298} __attribute__ ((packed,aligned(8)));
299
300union iucv_param {
301 struct iucv_cmd_control ctrl;
302 struct iucv_cmd_dpl dpl;
303 struct iucv_cmd_db db;
304 struct iucv_cmd_purge purge;
305 struct iucv_cmd_set_mask set_mask;
306};
307
308/*
309 * Anchor for per-cpu IUCV command parameter block.
310 */
311static union iucv_param *iucv_param[NR_CPUS];
312static union iucv_param *iucv_param_irq[NR_CPUS];
313
314/**
315 * iucv_call_b2f0
316 * @code: identifier of IUCV call to CP.
317 * @parm: pointer to a struct iucv_parm block
318 *
319 * Calls CP to execute IUCV commands.
320 *
321 * Returns the result of the CP IUCV call.
322 */
323static inline int iucv_call_b2f0(int command, union iucv_param *parm)
324{
325 register unsigned long reg0 asm ("0");
326 register unsigned long reg1 asm ("1");
327 int ccode;
328
329 reg0 = command;
330 reg1 = virt_to_phys(parm);
331 asm volatile(
332 " .long 0xb2f01000\n"
333 " ipm %0\n"
334 " srl %0,28\n"
335 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
336 : "m" (*parm) : "cc");
337 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
338}
339
340/**
341 * iucv_query_maxconn
342 *
343 * Determines the maximum number of connections that may be established.
344 *
345 * Returns the maximum number of connections or -EPERM is IUCV is not
346 * available.
347 */
348static int iucv_query_maxconn(void)
349{
350 register unsigned long reg0 asm ("0");
351 register unsigned long reg1 asm ("1");
352 void *param;
353 int ccode;
354
355 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
356 if (!param)
357 return -ENOMEM;
358 reg0 = IUCV_QUERY;
359 reg1 = (unsigned long) param;
360 asm volatile (
361 " .long 0xb2f01000\n"
362 " ipm %0\n"
363 " srl %0,28\n"
364 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
365 if (ccode == 0)
366 iucv_max_pathid = reg1;
367 kfree(param);
368 return ccode ? -EPERM : 0;
369}
370
371/**
372 * iucv_allow_cpu
373 * @data: unused
374 *
375 * Allow iucv interrupts on this cpu.
376 */
377static void iucv_allow_cpu(void *data)
378{
379 int cpu = smp_processor_id();
380 union iucv_param *parm;
381
382 /*
383 * Enable all iucv interrupts.
384 * ipmask contains bits for the different interrupts
385 * 0x80 - Flag to allow nonpriority message pending interrupts
386 * 0x40 - Flag to allow priority message pending interrupts
387 * 0x20 - Flag to allow nonpriority message completion interrupts
388 * 0x10 - Flag to allow priority message completion interrupts
389 * 0x08 - Flag to allow IUCV control interrupts
390 */
391 parm = iucv_param_irq[cpu];
392 memset(parm, 0, sizeof(union iucv_param));
393 parm->set_mask.ipmask = 0xf8;
394 iucv_call_b2f0(IUCV_SETMASK, parm);
395
396 /*
397 * Enable all iucv control interrupts.
398 * ipmask contains bits for the different interrupts
399 * 0x80 - Flag to allow pending connections interrupts
400 * 0x40 - Flag to allow connection complete interrupts
401 * 0x20 - Flag to allow connection severed interrupts
402 * 0x10 - Flag to allow connection quiesced interrupts
403 * 0x08 - Flag to allow connection resumed interrupts
404 */
405 memset(parm, 0, sizeof(union iucv_param));
406 parm->set_mask.ipmask = 0xf8;
407 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
408 /* Set indication that iucv interrupts are allowed for this cpu. */
409 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
410}
411
412/**
413 * iucv_block_cpu
414 * @data: unused
415 *
416 * Block iucv interrupts on this cpu.
417 */
418static void iucv_block_cpu(void *data)
419{
420 int cpu = smp_processor_id();
421 union iucv_param *parm;
422
423 /* Disable all iucv interrupts. */
424 parm = iucv_param_irq[cpu];
425 memset(parm, 0, sizeof(union iucv_param));
426 iucv_call_b2f0(IUCV_SETMASK, parm);
427
428 /* Clear indication that iucv interrupts are allowed for this cpu. */
429 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
430}
431
432/**
433 * iucv_block_cpu_almost
434 * @data: unused
435 *
436 * Allow connection-severed interrupts only on this cpu.
437 */
438static void iucv_block_cpu_almost(void *data)
439{
440 int cpu = smp_processor_id();
441 union iucv_param *parm;
442
443 /* Allow iucv control interrupts only */
444 parm = iucv_param_irq[cpu];
445 memset(parm, 0, sizeof(union iucv_param));
446 parm->set_mask.ipmask = 0x08;
447 iucv_call_b2f0(IUCV_SETMASK, parm);
448 /* Allow iucv-severed interrupt only */
449 memset(parm, 0, sizeof(union iucv_param));
450 parm->set_mask.ipmask = 0x20;
451 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
452
453 /* Clear indication that iucv interrupts are allowed for this cpu. */
454 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
455}
456
457/**
458 * iucv_declare_cpu
459 * @data: unused
460 *
461 * Declare a interrupt buffer on this cpu.
462 */
463static void iucv_declare_cpu(void *data)
464{
465 int cpu = smp_processor_id();
466 union iucv_param *parm;
467 int rc;
468
469 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
470 return;
471
472 /* Declare interrupt buffer. */
473 parm = iucv_param_irq[cpu];
474 memset(parm, 0, sizeof(union iucv_param));
475 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
476 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
477 if (rc) {
478 char *err = "Unknown";
479 switch (rc) {
480 case 0x03:
481 err = "Directory error";
482 break;
483 case 0x0a:
484 err = "Invalid length";
485 break;
486 case 0x13:
487 err = "Buffer already exists";
488 break;
489 case 0x3e:
490 err = "Buffer overlap";
491 break;
492 case 0x5c:
493 err = "Paging or storage error";
494 break;
495 }
496 pr_warning("Defining an interrupt buffer on CPU %i"
497 " failed with 0x%02x (%s)\n", cpu, rc, err);
498 return;
499 }
500
501 /* Set indication that an iucv buffer exists for this cpu. */
502 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
503
504 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
505 /* Enable iucv interrupts on this cpu. */
506 iucv_allow_cpu(NULL);
507 else
508 /* Disable iucv interrupts on this cpu. */
509 iucv_block_cpu(NULL);
510}
511
512/**
513 * iucv_retrieve_cpu
514 * @data: unused
515 *
516 * Retrieve interrupt buffer on this cpu.
517 */
518static void iucv_retrieve_cpu(void *data)
519{
520 int cpu = smp_processor_id();
521 union iucv_param *parm;
522
523 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
524 return;
525
526 /* Block iucv interrupts. */
527 iucv_block_cpu(NULL);
528
529 /* Retrieve interrupt buffer. */
530 parm = iucv_param_irq[cpu];
531 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
532
533 /* Clear indication that an iucv buffer exists for this cpu. */
534 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
535}
536
537/**
538 * iucv_setmask_smp
539 *
540 * Allow iucv interrupts on all cpus.
541 */
542static void iucv_setmask_mp(void)
543{
544 int cpu;
545
546 get_online_cpus();
547 for_each_online_cpu(cpu)
548 /* Enable all cpus with a declared buffer. */
549 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
550 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
551 smp_call_function_single(cpu, iucv_allow_cpu,
552 NULL, 1);
553 put_online_cpus();
554}
555
556/**
557 * iucv_setmask_up
558 *
559 * Allow iucv interrupts on a single cpu.
560 */
561static void iucv_setmask_up(void)
562{
563 cpumask_t cpumask;
564 int cpu;
565
566 /* Disable all cpu but the first in cpu_irq_cpumask. */
567 cpumask_copy(&cpumask, &iucv_irq_cpumask);
568 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
569 for_each_cpu(cpu, &cpumask)
570 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
571}
572
573/**
574 * iucv_enable
575 *
576 * This function makes iucv ready for use. It allocates the pathid
577 * table, declares an iucv interrupt buffer and enables the iucv
578 * interrupts. Called when the first user has registered an iucv
579 * handler.
580 */
581static int iucv_enable(void)
582{
583 size_t alloc_size;
584 int cpu, rc;
585
586 get_online_cpus();
587 rc = -ENOMEM;
588 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
589 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
590 if (!iucv_path_table)
591 goto out;
592 /* Declare per cpu buffers. */
593 rc = -EIO;
594 for_each_online_cpu(cpu)
595 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
596 if (cpumask_empty(&iucv_buffer_cpumask))
597 /* No cpu could declare an iucv buffer. */
598 goto out;
599 put_online_cpus();
600 return 0;
601out:
602 kfree(iucv_path_table);
603 iucv_path_table = NULL;
604 put_online_cpus();
605 return rc;
606}
607
608/**
609 * iucv_disable
610 *
611 * This function shuts down iucv. It disables iucv interrupts, retrieves
612 * the iucv interrupt buffer and frees the pathid table. Called after the
613 * last user unregister its iucv handler.
614 */
615static void iucv_disable(void)
616{
617 get_online_cpus();
618 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
619 kfree(iucv_path_table);
620 iucv_path_table = NULL;
621 put_online_cpus();
622}
623
624static void free_iucv_data(int cpu)
625{
626 kfree(iucv_param_irq[cpu]);
627 iucv_param_irq[cpu] = NULL;
628 kfree(iucv_param[cpu]);
629 iucv_param[cpu] = NULL;
630 kfree(iucv_irq_data[cpu]);
631 iucv_irq_data[cpu] = NULL;
632}
633
634static int alloc_iucv_data(int cpu)
635{
636 /* Note: GFP_DMA used to get memory below 2G */
637 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
638 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
639 if (!iucv_irq_data[cpu])
640 goto out_free;
641
642 /* Allocate parameter blocks. */
643 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
644 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
645 if (!iucv_param[cpu])
646 goto out_free;
647
648 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
649 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
650 if (!iucv_param_irq[cpu])
651 goto out_free;
652
653 return 0;
654
655out_free:
656 free_iucv_data(cpu);
657 return -ENOMEM;
658}
659
660static int iucv_cpu_notify(struct notifier_block *self,
661 unsigned long action, void *hcpu)
662{
663 cpumask_t cpumask;
664 long cpu = (long) hcpu;
665
666 switch (action) {
667 case CPU_UP_PREPARE:
668 case CPU_UP_PREPARE_FROZEN:
669 if (alloc_iucv_data(cpu))
670 return notifier_from_errno(-ENOMEM);
671 break;
672 case CPU_UP_CANCELED:
673 case CPU_UP_CANCELED_FROZEN:
674 case CPU_DEAD:
675 case CPU_DEAD_FROZEN:
676 free_iucv_data(cpu);
677 break;
678 case CPU_ONLINE:
679 case CPU_ONLINE_FROZEN:
680 case CPU_DOWN_FAILED:
681 case CPU_DOWN_FAILED_FROZEN:
682 if (!iucv_path_table)
683 break;
684 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
685 break;
686 case CPU_DOWN_PREPARE:
687 case CPU_DOWN_PREPARE_FROZEN:
688 if (!iucv_path_table)
689 break;
690 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
691 cpumask_clear_cpu(cpu, &cpumask);
692 if (cpumask_empty(&cpumask))
693 /* Can't offline last IUCV enabled cpu. */
694 return notifier_from_errno(-EINVAL);
695 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
696 if (cpumask_empty(&iucv_irq_cpumask))
697 smp_call_function_single(
698 cpumask_first(&iucv_buffer_cpumask),
699 iucv_allow_cpu, NULL, 1);
700 break;
701 }
702 return NOTIFY_OK;
703}
704
705static struct notifier_block __refdata iucv_cpu_notifier = {
706 .notifier_call = iucv_cpu_notify,
707};
708
709/**
710 * iucv_sever_pathid
711 * @pathid: path identification number.
712 * @userdata: 16-bytes of user data.
713 *
714 * Sever an iucv path to free up the pathid. Used internally.
715 */
716static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
717{
718 union iucv_param *parm;
719
720 parm = iucv_param_irq[smp_processor_id()];
721 memset(parm, 0, sizeof(union iucv_param));
722 if (userdata)
723 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
724 parm->ctrl.ippathid = pathid;
725 return iucv_call_b2f0(IUCV_SEVER, parm);
726}
727
728/**
729 * __iucv_cleanup_queue
730 * @dummy: unused dummy argument
731 *
732 * Nop function called via smp_call_function to force work items from
733 * pending external iucv interrupts to the work queue.
734 */
735static void __iucv_cleanup_queue(void *dummy)
736{
737}
738
739/**
740 * iucv_cleanup_queue
741 *
742 * Function called after a path has been severed to find all remaining
743 * work items for the now stale pathid. The caller needs to hold the
744 * iucv_table_lock.
745 */
746static void iucv_cleanup_queue(void)
747{
748 struct iucv_irq_list *p, *n;
749
750 /*
751 * When a path is severed, the pathid can be reused immediately
752 * on a iucv connect or a connection pending interrupt. Remove
753 * all entries from the task queue that refer to a stale pathid
754 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
755 * or deliver the connection pending interrupt. To get all the
756 * pending interrupts force them to the work queue by calling
757 * an empty function on all cpus.
758 */
759 smp_call_function(__iucv_cleanup_queue, NULL, 1);
760 spin_lock_irq(&iucv_queue_lock);
761 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
762 /* Remove stale work items from the task queue. */
763 if (iucv_path_table[p->data.ippathid] == NULL) {
764 list_del(&p->list);
765 kfree(p);
766 }
767 }
768 spin_unlock_irq(&iucv_queue_lock);
769}
770
771/**
772 * iucv_register:
773 * @handler: address of iucv handler structure
774 * @smp: != 0 indicates that the handler can deal with out of order messages
775 *
776 * Registers a driver with IUCV.
777 *
778 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
779 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
780 */
781int iucv_register(struct iucv_handler *handler, int smp)
782{
783 int rc;
784
785 if (!iucv_available)
786 return -ENOSYS;
787 mutex_lock(&iucv_register_mutex);
788 if (!smp)
789 iucv_nonsmp_handler++;
790 if (list_empty(&iucv_handler_list)) {
791 rc = iucv_enable();
792 if (rc)
793 goto out_mutex;
794 } else if (!smp && iucv_nonsmp_handler == 1)
795 iucv_setmask_up();
796 INIT_LIST_HEAD(&handler->paths);
797
798 spin_lock_bh(&iucv_table_lock);
799 list_add_tail(&handler->list, &iucv_handler_list);
800 spin_unlock_bh(&iucv_table_lock);
801 rc = 0;
802out_mutex:
803 mutex_unlock(&iucv_register_mutex);
804 return rc;
805}
806EXPORT_SYMBOL(iucv_register);
807
808/**
809 * iucv_unregister
810 * @handler: address of iucv handler structure
811 * @smp: != 0 indicates that the handler can deal with out of order messages
812 *
813 * Unregister driver from IUCV.
814 */
815void iucv_unregister(struct iucv_handler *handler, int smp)
816{
817 struct iucv_path *p, *n;
818
819 mutex_lock(&iucv_register_mutex);
820 spin_lock_bh(&iucv_table_lock);
821 /* Remove handler from the iucv_handler_list. */
822 list_del_init(&handler->list);
823 /* Sever all pathids still referring to the handler. */
824 list_for_each_entry_safe(p, n, &handler->paths, list) {
825 iucv_sever_pathid(p->pathid, NULL);
826 iucv_path_table[p->pathid] = NULL;
827 list_del(&p->list);
828 iucv_path_free(p);
829 }
830 spin_unlock_bh(&iucv_table_lock);
831 if (!smp)
832 iucv_nonsmp_handler--;
833 if (list_empty(&iucv_handler_list))
834 iucv_disable();
835 else if (!smp && iucv_nonsmp_handler == 0)
836 iucv_setmask_mp();
837 mutex_unlock(&iucv_register_mutex);
838}
839EXPORT_SYMBOL(iucv_unregister);
840
841static int iucv_reboot_event(struct notifier_block *this,
842 unsigned long event, void *ptr)
843{
844 int i;
845
846 if (cpumask_empty(&iucv_irq_cpumask))
847 return NOTIFY_DONE;
848
849 get_online_cpus();
850 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
851 preempt_disable();
852 for (i = 0; i < iucv_max_pathid; i++) {
853 if (iucv_path_table[i])
854 iucv_sever_pathid(i, NULL);
855 }
856 preempt_enable();
857 put_online_cpus();
858 iucv_disable();
859 return NOTIFY_DONE;
860}
861
862static struct notifier_block iucv_reboot_notifier = {
863 .notifier_call = iucv_reboot_event,
864};
865
866/**
867 * iucv_path_accept
868 * @path: address of iucv path structure
869 * @handler: address of iucv handler structure
870 * @userdata: 16 bytes of data reflected to the communication partner
871 * @private: private data passed to interrupt handlers for this path
872 *
873 * This function is issued after the user received a connection pending
874 * external interrupt and now wishes to complete the IUCV communication path.
875 *
876 * Returns the result of the CP IUCV call.
877 */
878int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
879 u8 userdata[16], void *private)
880{
881 union iucv_param *parm;
882 int rc;
883
884 local_bh_disable();
885 if (cpumask_empty(&iucv_buffer_cpumask)) {
886 rc = -EIO;
887 goto out;
888 }
889 /* Prepare parameter block. */
890 parm = iucv_param[smp_processor_id()];
891 memset(parm, 0, sizeof(union iucv_param));
892 parm->ctrl.ippathid = path->pathid;
893 parm->ctrl.ipmsglim = path->msglim;
894 if (userdata)
895 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
896 parm->ctrl.ipflags1 = path->flags;
897
898 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
899 if (!rc) {
900 path->private = private;
901 path->msglim = parm->ctrl.ipmsglim;
902 path->flags = parm->ctrl.ipflags1;
903 }
904out:
905 local_bh_enable();
906 return rc;
907}
908EXPORT_SYMBOL(iucv_path_accept);
909
910/**
911 * iucv_path_connect
912 * @path: address of iucv path structure
913 * @handler: address of iucv handler structure
914 * @userid: 8-byte user identification
915 * @system: 8-byte target system identification
916 * @userdata: 16 bytes of data reflected to the communication partner
917 * @private: private data passed to interrupt handlers for this path
918 *
919 * This function establishes an IUCV path. Although the connect may complete
920 * successfully, you are not able to use the path until you receive an IUCV
921 * Connection Complete external interrupt.
922 *
923 * Returns the result of the CP IUCV call.
924 */
925int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
926 u8 userid[8], u8 system[8], u8 userdata[16],
927 void *private)
928{
929 union iucv_param *parm;
930 int rc;
931
932 spin_lock_bh(&iucv_table_lock);
933 iucv_cleanup_queue();
934 if (cpumask_empty(&iucv_buffer_cpumask)) {
935 rc = -EIO;
936 goto out;
937 }
938 parm = iucv_param[smp_processor_id()];
939 memset(parm, 0, sizeof(union iucv_param));
940 parm->ctrl.ipmsglim = path->msglim;
941 parm->ctrl.ipflags1 = path->flags;
942 if (userid) {
943 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
944 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
945 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
946 }
947 if (system) {
948 memcpy(parm->ctrl.iptarget, system,
949 sizeof(parm->ctrl.iptarget));
950 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
951 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
952 }
953 if (userdata)
954 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
955
956 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
957 if (!rc) {
958 if (parm->ctrl.ippathid < iucv_max_pathid) {
959 path->pathid = parm->ctrl.ippathid;
960 path->msglim = parm->ctrl.ipmsglim;
961 path->flags = parm->ctrl.ipflags1;
962 path->handler = handler;
963 path->private = private;
964 list_add_tail(&path->list, &handler->paths);
965 iucv_path_table[path->pathid] = path;
966 } else {
967 iucv_sever_pathid(parm->ctrl.ippathid,
968 iucv_error_pathid);
969 rc = -EIO;
970 }
971 }
972out:
973 spin_unlock_bh(&iucv_table_lock);
974 return rc;
975}
976EXPORT_SYMBOL(iucv_path_connect);
977
978/**
979 * iucv_path_quiesce:
980 * @path: address of iucv path structure
981 * @userdata: 16 bytes of data reflected to the communication partner
982 *
983 * This function temporarily suspends incoming messages on an IUCV path.
984 * You can later reactivate the path by invoking the iucv_resume function.
985 *
986 * Returns the result from the CP IUCV call.
987 */
988int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
989{
990 union iucv_param *parm;
991 int rc;
992
993 local_bh_disable();
994 if (cpumask_empty(&iucv_buffer_cpumask)) {
995 rc = -EIO;
996 goto out;
997 }
998 parm = iucv_param[smp_processor_id()];
999 memset(parm, 0, sizeof(union iucv_param));
1000 if (userdata)
1001 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1002 parm->ctrl.ippathid = path->pathid;
1003 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
1004out:
1005 local_bh_enable();
1006 return rc;
1007}
1008EXPORT_SYMBOL(iucv_path_quiesce);
1009
1010/**
1011 * iucv_path_resume:
1012 * @path: address of iucv path structure
1013 * @userdata: 16 bytes of data reflected to the communication partner
1014 *
1015 * This function resumes incoming messages on an IUCV path that has
1016 * been stopped with iucv_path_quiesce.
1017 *
1018 * Returns the result from the CP IUCV call.
1019 */
1020int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1021{
1022 union iucv_param *parm;
1023 int rc;
1024
1025 local_bh_disable();
1026 if (cpumask_empty(&iucv_buffer_cpumask)) {
1027 rc = -EIO;
1028 goto out;
1029 }
1030 parm = iucv_param[smp_processor_id()];
1031 memset(parm, 0, sizeof(union iucv_param));
1032 if (userdata)
1033 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1034 parm->ctrl.ippathid = path->pathid;
1035 rc = iucv_call_b2f0(IUCV_RESUME, parm);
1036out:
1037 local_bh_enable();
1038 return rc;
1039}
1040
1041/**
1042 * iucv_path_sever
1043 * @path: address of iucv path structure
1044 * @userdata: 16 bytes of data reflected to the communication partner
1045 *
1046 * This function terminates an IUCV path.
1047 *
1048 * Returns the result from the CP IUCV call.
1049 */
1050int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1051{
1052 int rc;
1053
1054 preempt_disable();
1055 if (cpumask_empty(&iucv_buffer_cpumask)) {
1056 rc = -EIO;
1057 goto out;
1058 }
1059 if (iucv_active_cpu != smp_processor_id())
1060 spin_lock_bh(&iucv_table_lock);
1061 rc = iucv_sever_pathid(path->pathid, userdata);
1062 iucv_path_table[path->pathid] = NULL;
1063 list_del_init(&path->list);
1064 if (iucv_active_cpu != smp_processor_id())
1065 spin_unlock_bh(&iucv_table_lock);
1066out:
1067 preempt_enable();
1068 return rc;
1069}
1070EXPORT_SYMBOL(iucv_path_sever);
1071
1072/**
1073 * iucv_message_purge
1074 * @path: address of iucv path structure
1075 * @msg: address of iucv msg structure
1076 * @srccls: source class of message
1077 *
1078 * Cancels a message you have sent.
1079 *
1080 * Returns the result from the CP IUCV call.
1081 */
1082int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1083 u32 srccls)
1084{
1085 union iucv_param *parm;
1086 int rc;
1087
1088 local_bh_disable();
1089 if (cpumask_empty(&iucv_buffer_cpumask)) {
1090 rc = -EIO;
1091 goto out;
1092 }
1093 parm = iucv_param[smp_processor_id()];
1094 memset(parm, 0, sizeof(union iucv_param));
1095 parm->purge.ippathid = path->pathid;
1096 parm->purge.ipmsgid = msg->id;
1097 parm->purge.ipsrccls = srccls;
1098 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1099 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1100 if (!rc) {
1101 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1102 msg->tag = parm->purge.ipmsgtag;
1103 }
1104out:
1105 local_bh_enable();
1106 return rc;
1107}
1108EXPORT_SYMBOL(iucv_message_purge);
1109
1110/**
1111 * iucv_message_receive_iprmdata
1112 * @path: address of iucv path structure
1113 * @msg: address of iucv msg structure
1114 * @flags: how the message is received (IUCV_IPBUFLST)
1115 * @buffer: address of data buffer or address of struct iucv_array
1116 * @size: length of data buffer
1117 * @residual:
1118 *
1119 * Internal function used by iucv_message_receive and __iucv_message_receive
1120 * to receive RMDATA data stored in struct iucv_message.
1121 */
1122static int iucv_message_receive_iprmdata(struct iucv_path *path,
1123 struct iucv_message *msg,
1124 u8 flags, void *buffer,
1125 size_t size, size_t *residual)
1126{
1127 struct iucv_array *array;
1128 u8 *rmmsg;
1129 size_t copy;
1130
1131 /*
1132 * Message is 8 bytes long and has been stored to the
1133 * message descriptor itself.
1134 */
1135 if (residual)
1136 *residual = abs(size - 8);
1137 rmmsg = msg->rmmsg;
1138 if (flags & IUCV_IPBUFLST) {
1139 /* Copy to struct iucv_array. */
1140 size = (size < 8) ? size : 8;
1141 for (array = buffer; size > 0; array++) {
1142 copy = min_t(size_t, size, array->length);
1143 memcpy((u8 *)(addr_t) array->address,
1144 rmmsg, copy);
1145 rmmsg += copy;
1146 size -= copy;
1147 }
1148 } else {
1149 /* Copy to direct buffer. */
1150 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1151 }
1152 return 0;
1153}
1154
1155/**
1156 * __iucv_message_receive
1157 * @path: address of iucv path structure
1158 * @msg: address of iucv msg structure
1159 * @flags: how the message is received (IUCV_IPBUFLST)
1160 * @buffer: address of data buffer or address of struct iucv_array
1161 * @size: length of data buffer
1162 * @residual:
1163 *
1164 * This function receives messages that are being sent to you over
1165 * established paths. This function will deal with RMDATA messages
1166 * embedded in struct iucv_message as well.
1167 *
1168 * Locking: no locking
1169 *
1170 * Returns the result from the CP IUCV call.
1171 */
1172int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1173 u8 flags, void *buffer, size_t size, size_t *residual)
1174{
1175 union iucv_param *parm;
1176 int rc;
1177
1178 if (msg->flags & IUCV_IPRMDATA)
1179 return iucv_message_receive_iprmdata(path, msg, flags,
1180 buffer, size, residual);
1181 if (cpumask_empty(&iucv_buffer_cpumask)) {
1182 rc = -EIO;
1183 goto out;
1184 }
1185 parm = iucv_param[smp_processor_id()];
1186 memset(parm, 0, sizeof(union iucv_param));
1187 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1188 parm->db.ipbfln1f = (u32) size;
1189 parm->db.ipmsgid = msg->id;
1190 parm->db.ippathid = path->pathid;
1191 parm->db.iptrgcls = msg->class;
1192 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1193 IUCV_IPFGMID | IUCV_IPTRGCLS);
1194 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1195 if (!rc || rc == 5) {
1196 msg->flags = parm->db.ipflags1;
1197 if (residual)
1198 *residual = parm->db.ipbfln1f;
1199 }
1200out:
1201 return rc;
1202}
1203EXPORT_SYMBOL(__iucv_message_receive);
1204
1205/**
1206 * iucv_message_receive
1207 * @path: address of iucv path structure
1208 * @msg: address of iucv msg structure
1209 * @flags: how the message is received (IUCV_IPBUFLST)
1210 * @buffer: address of data buffer or address of struct iucv_array
1211 * @size: length of data buffer
1212 * @residual:
1213 *
1214 * This function receives messages that are being sent to you over
1215 * established paths. This function will deal with RMDATA messages
1216 * embedded in struct iucv_message as well.
1217 *
1218 * Locking: local_bh_enable/local_bh_disable
1219 *
1220 * Returns the result from the CP IUCV call.
1221 */
1222int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1223 u8 flags, void *buffer, size_t size, size_t *residual)
1224{
1225 int rc;
1226
1227 if (msg->flags & IUCV_IPRMDATA)
1228 return iucv_message_receive_iprmdata(path, msg, flags,
1229 buffer, size, residual);
1230 local_bh_disable();
1231 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1232 local_bh_enable();
1233 return rc;
1234}
1235EXPORT_SYMBOL(iucv_message_receive);
1236
1237/**
1238 * iucv_message_reject
1239 * @path: address of iucv path structure
1240 * @msg: address of iucv msg structure
1241 *
1242 * The reject function refuses a specified message. Between the time you
1243 * are notified of a message and the time that you complete the message,
1244 * the message may be rejected.
1245 *
1246 * Returns the result from the CP IUCV call.
1247 */
1248int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1249{
1250 union iucv_param *parm;
1251 int rc;
1252
1253 local_bh_disable();
1254 if (cpumask_empty(&iucv_buffer_cpumask)) {
1255 rc = -EIO;
1256 goto out;
1257 }
1258 parm = iucv_param[smp_processor_id()];
1259 memset(parm, 0, sizeof(union iucv_param));
1260 parm->db.ippathid = path->pathid;
1261 parm->db.ipmsgid = msg->id;
1262 parm->db.iptrgcls = msg->class;
1263 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1264 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1265out:
1266 local_bh_enable();
1267 return rc;
1268}
1269EXPORT_SYMBOL(iucv_message_reject);
1270
1271/**
1272 * iucv_message_reply
1273 * @path: address of iucv path structure
1274 * @msg: address of iucv msg structure
1275 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1276 * @reply: address of reply data buffer or address of struct iucv_array
1277 * @size: length of reply data buffer
1278 *
1279 * This function responds to the two-way messages that you receive. You
1280 * must identify completely the message to which you wish to reply. ie,
1281 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1282 * the parameter list.
1283 *
1284 * Returns the result from the CP IUCV call.
1285 */
1286int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1287 u8 flags, void *reply, size_t size)
1288{
1289 union iucv_param *parm;
1290 int rc;
1291
1292 local_bh_disable();
1293 if (cpumask_empty(&iucv_buffer_cpumask)) {
1294 rc = -EIO;
1295 goto out;
1296 }
1297 parm = iucv_param[smp_processor_id()];
1298 memset(parm, 0, sizeof(union iucv_param));
1299 if (flags & IUCV_IPRMDATA) {
1300 parm->dpl.ippathid = path->pathid;
1301 parm->dpl.ipflags1 = flags;
1302 parm->dpl.ipmsgid = msg->id;
1303 parm->dpl.iptrgcls = msg->class;
1304 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1305 } else {
1306 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1307 parm->db.ipbfln1f = (u32) size;
1308 parm->db.ippathid = path->pathid;
1309 parm->db.ipflags1 = flags;
1310 parm->db.ipmsgid = msg->id;
1311 parm->db.iptrgcls = msg->class;
1312 }
1313 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1314out:
1315 local_bh_enable();
1316 return rc;
1317}
1318EXPORT_SYMBOL(iucv_message_reply);
1319
1320/**
1321 * __iucv_message_send
1322 * @path: address of iucv path structure
1323 * @msg: address of iucv msg structure
1324 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1325 * @srccls: source class of message
1326 * @buffer: address of send buffer or address of struct iucv_array
1327 * @size: length of send buffer
1328 *
1329 * This function transmits data to another application. Data to be
1330 * transmitted is in a buffer and this is a one-way message and the
1331 * receiver will not reply to the message.
1332 *
1333 * Locking: no locking
1334 *
1335 * Returns the result from the CP IUCV call.
1336 */
1337int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1338 u8 flags, u32 srccls, void *buffer, size_t size)
1339{
1340 union iucv_param *parm;
1341 int rc;
1342
1343 if (cpumask_empty(&iucv_buffer_cpumask)) {
1344 rc = -EIO;
1345 goto out;
1346 }
1347 parm = iucv_param[smp_processor_id()];
1348 memset(parm, 0, sizeof(union iucv_param));
1349 if (flags & IUCV_IPRMDATA) {
1350 /* Message of 8 bytes can be placed into the parameter list. */
1351 parm->dpl.ippathid = path->pathid;
1352 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1353 parm->dpl.iptrgcls = msg->class;
1354 parm->dpl.ipsrccls = srccls;
1355 parm->dpl.ipmsgtag = msg->tag;
1356 memcpy(parm->dpl.iprmmsg, buffer, 8);
1357 } else {
1358 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1359 parm->db.ipbfln1f = (u32) size;
1360 parm->db.ippathid = path->pathid;
1361 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1362 parm->db.iptrgcls = msg->class;
1363 parm->db.ipsrccls = srccls;
1364 parm->db.ipmsgtag = msg->tag;
1365 }
1366 rc = iucv_call_b2f0(IUCV_SEND, parm);
1367 if (!rc)
1368 msg->id = parm->db.ipmsgid;
1369out:
1370 return rc;
1371}
1372EXPORT_SYMBOL(__iucv_message_send);
1373
1374/**
1375 * iucv_message_send
1376 * @path: address of iucv path structure
1377 * @msg: address of iucv msg structure
1378 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1379 * @srccls: source class of message
1380 * @buffer: address of send buffer or address of struct iucv_array
1381 * @size: length of send buffer
1382 *
1383 * This function transmits data to another application. Data to be
1384 * transmitted is in a buffer and this is a one-way message and the
1385 * receiver will not reply to the message.
1386 *
1387 * Locking: local_bh_enable/local_bh_disable
1388 *
1389 * Returns the result from the CP IUCV call.
1390 */
1391int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1392 u8 flags, u32 srccls, void *buffer, size_t size)
1393{
1394 int rc;
1395
1396 local_bh_disable();
1397 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1398 local_bh_enable();
1399 return rc;
1400}
1401EXPORT_SYMBOL(iucv_message_send);
1402
1403/**
1404 * iucv_message_send2way
1405 * @path: address of iucv path structure
1406 * @msg: address of iucv msg structure
1407 * @flags: how the message is sent and the reply is received
1408 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1409 * @srccls: source class of message
1410 * @buffer: address of send buffer or address of struct iucv_array
1411 * @size: length of send buffer
1412 * @ansbuf: address of answer buffer or address of struct iucv_array
1413 * @asize: size of reply buffer
1414 *
1415 * This function transmits data to another application. Data to be
1416 * transmitted is in a buffer. The receiver of the send is expected to
1417 * reply to the message and a buffer is provided into which IUCV moves
1418 * the reply to this message.
1419 *
1420 * Returns the result from the CP IUCV call.
1421 */
1422int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1423 u8 flags, u32 srccls, void *buffer, size_t size,
1424 void *answer, size_t asize, size_t *residual)
1425{
1426 union iucv_param *parm;
1427 int rc;
1428
1429 local_bh_disable();
1430 if (cpumask_empty(&iucv_buffer_cpumask)) {
1431 rc = -EIO;
1432 goto out;
1433 }
1434 parm = iucv_param[smp_processor_id()];
1435 memset(parm, 0, sizeof(union iucv_param));
1436 if (flags & IUCV_IPRMDATA) {
1437 parm->dpl.ippathid = path->pathid;
1438 parm->dpl.ipflags1 = path->flags; /* priority message */
1439 parm->dpl.iptrgcls = msg->class;
1440 parm->dpl.ipsrccls = srccls;
1441 parm->dpl.ipmsgtag = msg->tag;
1442 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1443 parm->dpl.ipbfln2f = (u32) asize;
1444 memcpy(parm->dpl.iprmmsg, buffer, 8);
1445 } else {
1446 parm->db.ippathid = path->pathid;
1447 parm->db.ipflags1 = path->flags; /* priority message */
1448 parm->db.iptrgcls = msg->class;
1449 parm->db.ipsrccls = srccls;
1450 parm->db.ipmsgtag = msg->tag;
1451 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1452 parm->db.ipbfln1f = (u32) size;
1453 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1454 parm->db.ipbfln2f = (u32) asize;
1455 }
1456 rc = iucv_call_b2f0(IUCV_SEND, parm);
1457 if (!rc)
1458 msg->id = parm->db.ipmsgid;
1459out:
1460 local_bh_enable();
1461 return rc;
1462}
1463EXPORT_SYMBOL(iucv_message_send2way);
1464
1465/**
1466 * iucv_path_pending
1467 * @data: Pointer to external interrupt buffer
1468 *
1469 * Process connection pending work item. Called from tasklet while holding
1470 * iucv_table_lock.
1471 */
1472struct iucv_path_pending {
1473 u16 ippathid;
1474 u8 ipflags1;
1475 u8 iptype;
1476 u16 ipmsglim;
1477 u16 res1;
1478 u8 ipvmid[8];
1479 u8 ipuser[16];
1480 u32 res3;
1481 u8 ippollfg;
1482 u8 res4[3];
1483} __packed;
1484
1485static void iucv_path_pending(struct iucv_irq_data *data)
1486{
1487 struct iucv_path_pending *ipp = (void *) data;
1488 struct iucv_handler *handler;
1489 struct iucv_path *path;
1490 char *error;
1491
1492 BUG_ON(iucv_path_table[ipp->ippathid]);
1493 /* New pathid, handler found. Create a new path struct. */
1494 error = iucv_error_no_memory;
1495 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1496 if (!path)
1497 goto out_sever;
1498 path->pathid = ipp->ippathid;
1499 iucv_path_table[path->pathid] = path;
1500 EBCASC(ipp->ipvmid, 8);
1501
1502 /* Call registered handler until one is found that wants the path. */
1503 list_for_each_entry(handler, &iucv_handler_list, list) {
1504 if (!handler->path_pending)
1505 continue;
1506 /*
1507 * Add path to handler to allow a call to iucv_path_sever
1508 * inside the path_pending function. If the handler returns
1509 * an error remove the path from the handler again.
1510 */
1511 list_add(&path->list, &handler->paths);
1512 path->handler = handler;
1513 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1514 return;
1515 list_del(&path->list);
1516 path->handler = NULL;
1517 }
1518 /* No handler wanted the path. */
1519 iucv_path_table[path->pathid] = NULL;
1520 iucv_path_free(path);
1521 error = iucv_error_no_listener;
1522out_sever:
1523 iucv_sever_pathid(ipp->ippathid, error);
1524}
1525
1526/**
1527 * iucv_path_complete
1528 * @data: Pointer to external interrupt buffer
1529 *
1530 * Process connection complete work item. Called from tasklet while holding
1531 * iucv_table_lock.
1532 */
1533struct iucv_path_complete {
1534 u16 ippathid;
1535 u8 ipflags1;
1536 u8 iptype;
1537 u16 ipmsglim;
1538 u16 res1;
1539 u8 res2[8];
1540 u8 ipuser[16];
1541 u32 res3;
1542 u8 ippollfg;
1543 u8 res4[3];
1544} __packed;
1545
1546static void iucv_path_complete(struct iucv_irq_data *data)
1547{
1548 struct iucv_path_complete *ipc = (void *) data;
1549 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1550
1551 if (path)
1552 path->flags = ipc->ipflags1;
1553 if (path && path->handler && path->handler->path_complete)
1554 path->handler->path_complete(path, ipc->ipuser);
1555}
1556
1557/**
1558 * iucv_path_severed
1559 * @data: Pointer to external interrupt buffer
1560 *
1561 * Process connection severed work item. Called from tasklet while holding
1562 * iucv_table_lock.
1563 */
1564struct iucv_path_severed {
1565 u16 ippathid;
1566 u8 res1;
1567 u8 iptype;
1568 u32 res2;
1569 u8 res3[8];
1570 u8 ipuser[16];
1571 u32 res4;
1572 u8 ippollfg;
1573 u8 res5[3];
1574} __packed;
1575
1576static void iucv_path_severed(struct iucv_irq_data *data)
1577{
1578 struct iucv_path_severed *ips = (void *) data;
1579 struct iucv_path *path = iucv_path_table[ips->ippathid];
1580
1581 if (!path || !path->handler) /* Already severed */
1582 return;
1583 if (path->handler->path_severed)
1584 path->handler->path_severed(path, ips->ipuser);
1585 else {
1586 iucv_sever_pathid(path->pathid, NULL);
1587 iucv_path_table[path->pathid] = NULL;
1588 list_del(&path->list);
1589 iucv_path_free(path);
1590 }
1591}
1592
1593/**
1594 * iucv_path_quiesced
1595 * @data: Pointer to external interrupt buffer
1596 *
1597 * Process connection quiesced work item. Called from tasklet while holding
1598 * iucv_table_lock.
1599 */
1600struct iucv_path_quiesced {
1601 u16 ippathid;
1602 u8 res1;
1603 u8 iptype;
1604 u32 res2;
1605 u8 res3[8];
1606 u8 ipuser[16];
1607 u32 res4;
1608 u8 ippollfg;
1609 u8 res5[3];
1610} __packed;
1611
1612static void iucv_path_quiesced(struct iucv_irq_data *data)
1613{
1614 struct iucv_path_quiesced *ipq = (void *) data;
1615 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1616
1617 if (path && path->handler && path->handler->path_quiesced)
1618 path->handler->path_quiesced(path, ipq->ipuser);
1619}
1620
1621/**
1622 * iucv_path_resumed
1623 * @data: Pointer to external interrupt buffer
1624 *
1625 * Process connection resumed work item. Called from tasklet while holding
1626 * iucv_table_lock.
1627 */
1628struct iucv_path_resumed {
1629 u16 ippathid;
1630 u8 res1;
1631 u8 iptype;
1632 u32 res2;
1633 u8 res3[8];
1634 u8 ipuser[16];
1635 u32 res4;
1636 u8 ippollfg;
1637 u8 res5[3];
1638} __packed;
1639
1640static void iucv_path_resumed(struct iucv_irq_data *data)
1641{
1642 struct iucv_path_resumed *ipr = (void *) data;
1643 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1644
1645 if (path && path->handler && path->handler->path_resumed)
1646 path->handler->path_resumed(path, ipr->ipuser);
1647}
1648
1649/**
1650 * iucv_message_complete
1651 * @data: Pointer to external interrupt buffer
1652 *
1653 * Process message complete work item. Called from tasklet while holding
1654 * iucv_table_lock.
1655 */
1656struct iucv_message_complete {
1657 u16 ippathid;
1658 u8 ipflags1;
1659 u8 iptype;
1660 u32 ipmsgid;
1661 u32 ipaudit;
1662 u8 iprmmsg[8];
1663 u32 ipsrccls;
1664 u32 ipmsgtag;
1665 u32 res;
1666 u32 ipbfln2f;
1667 u8 ippollfg;
1668 u8 res2[3];
1669} __packed;
1670
1671static void iucv_message_complete(struct iucv_irq_data *data)
1672{
1673 struct iucv_message_complete *imc = (void *) data;
1674 struct iucv_path *path = iucv_path_table[imc->ippathid];
1675 struct iucv_message msg;
1676
1677 if (path && path->handler && path->handler->message_complete) {
1678 msg.flags = imc->ipflags1;
1679 msg.id = imc->ipmsgid;
1680 msg.audit = imc->ipaudit;
1681 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1682 msg.class = imc->ipsrccls;
1683 msg.tag = imc->ipmsgtag;
1684 msg.length = imc->ipbfln2f;
1685 path->handler->message_complete(path, &msg);
1686 }
1687}
1688
1689/**
1690 * iucv_message_pending
1691 * @data: Pointer to external interrupt buffer
1692 *
1693 * Process message pending work item. Called from tasklet while holding
1694 * iucv_table_lock.
1695 */
1696struct iucv_message_pending {
1697 u16 ippathid;
1698 u8 ipflags1;
1699 u8 iptype;
1700 u32 ipmsgid;
1701 u32 iptrgcls;
1702 union {
1703 u32 iprmmsg1_u32;
1704 u8 iprmmsg1[4];
1705 } ln1msg1;
1706 union {
1707 u32 ipbfln1f;
1708 u8 iprmmsg2[4];
1709 } ln1msg2;
1710 u32 res1[3];
1711 u32 ipbfln2f;
1712 u8 ippollfg;
1713 u8 res2[3];
1714} __packed;
1715
1716static void iucv_message_pending(struct iucv_irq_data *data)
1717{
1718 struct iucv_message_pending *imp = (void *) data;
1719 struct iucv_path *path = iucv_path_table[imp->ippathid];
1720 struct iucv_message msg;
1721
1722 if (path && path->handler && path->handler->message_pending) {
1723 msg.flags = imp->ipflags1;
1724 msg.id = imp->ipmsgid;
1725 msg.class = imp->iptrgcls;
1726 if (imp->ipflags1 & IUCV_IPRMDATA) {
1727 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1728 msg.length = 8;
1729 } else
1730 msg.length = imp->ln1msg2.ipbfln1f;
1731 msg.reply_size = imp->ipbfln2f;
1732 path->handler->message_pending(path, &msg);
1733 }
1734}
1735
1736/**
1737 * iucv_tasklet_fn:
1738 *
1739 * This tasklet loops over the queue of irq buffers created by
1740 * iucv_external_interrupt, calls the appropriate action handler
1741 * and then frees the buffer.
1742 */
1743static void iucv_tasklet_fn(unsigned long ignored)
1744{
1745 typedef void iucv_irq_fn(struct iucv_irq_data *);
1746 static iucv_irq_fn *irq_fn[] = {
1747 [0x02] = iucv_path_complete,
1748 [0x03] = iucv_path_severed,
1749 [0x04] = iucv_path_quiesced,
1750 [0x05] = iucv_path_resumed,
1751 [0x06] = iucv_message_complete,
1752 [0x07] = iucv_message_complete,
1753 [0x08] = iucv_message_pending,
1754 [0x09] = iucv_message_pending,
1755 };
1756 LIST_HEAD(task_queue);
1757 struct iucv_irq_list *p, *n;
1758
1759 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1760 if (!spin_trylock(&iucv_table_lock)) {
1761 tasklet_schedule(&iucv_tasklet);
1762 return;
1763 }
1764 iucv_active_cpu = smp_processor_id();
1765
1766 spin_lock_irq(&iucv_queue_lock);
1767 list_splice_init(&iucv_task_queue, &task_queue);
1768 spin_unlock_irq(&iucv_queue_lock);
1769
1770 list_for_each_entry_safe(p, n, &task_queue, list) {
1771 list_del_init(&p->list);
1772 irq_fn[p->data.iptype](&p->data);
1773 kfree(p);
1774 }
1775
1776 iucv_active_cpu = -1;
1777 spin_unlock(&iucv_table_lock);
1778}
1779
1780/**
1781 * iucv_work_fn:
1782 *
1783 * This work function loops over the queue of path pending irq blocks
1784 * created by iucv_external_interrupt, calls the appropriate action
1785 * handler and then frees the buffer.
1786 */
1787static void iucv_work_fn(struct work_struct *work)
1788{
1789 LIST_HEAD(work_queue);
1790 struct iucv_irq_list *p, *n;
1791
1792 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1793 spin_lock_bh(&iucv_table_lock);
1794 iucv_active_cpu = smp_processor_id();
1795
1796 spin_lock_irq(&iucv_queue_lock);
1797 list_splice_init(&iucv_work_queue, &work_queue);
1798 spin_unlock_irq(&iucv_queue_lock);
1799
1800 iucv_cleanup_queue();
1801 list_for_each_entry_safe(p, n, &work_queue, list) {
1802 list_del_init(&p->list);
1803 iucv_path_pending(&p->data);
1804 kfree(p);
1805 }
1806
1807 iucv_active_cpu = -1;
1808 spin_unlock_bh(&iucv_table_lock);
1809}
1810
1811/**
1812 * iucv_external_interrupt
1813 * @code: irq code
1814 *
1815 * Handles external interrupts coming in from CP.
1816 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1817 */
1818static void iucv_external_interrupt(struct ext_code ext_code,
1819 unsigned int param32, unsigned long param64)
1820{
1821 struct iucv_irq_data *p;
1822 struct iucv_irq_list *work;
1823
1824 inc_irq_stat(IRQEXT_IUC);
1825 p = iucv_irq_data[smp_processor_id()];
1826 if (p->ippathid >= iucv_max_pathid) {
1827 WARN_ON(p->ippathid >= iucv_max_pathid);
1828 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1829 return;
1830 }
1831 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1832 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1833 if (!work) {
1834 pr_warning("iucv_external_interrupt: out of memory\n");
1835 return;
1836 }
1837 memcpy(&work->data, p, sizeof(work->data));
1838 spin_lock(&iucv_queue_lock);
1839 if (p->iptype == 0x01) {
1840 /* Path pending interrupt. */
1841 list_add_tail(&work->list, &iucv_work_queue);
1842 schedule_work(&iucv_work);
1843 } else {
1844 /* The other interrupts. */
1845 list_add_tail(&work->list, &iucv_task_queue);
1846 tasklet_schedule(&iucv_tasklet);
1847 }
1848 spin_unlock(&iucv_queue_lock);
1849}
1850
1851static int iucv_pm_prepare(struct device *dev)
1852{
1853 int rc = 0;
1854
1855#ifdef CONFIG_PM_DEBUG
1856 printk(KERN_INFO "iucv_pm_prepare\n");
1857#endif
1858 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1859 rc = dev->driver->pm->prepare(dev);
1860 return rc;
1861}
1862
1863static void iucv_pm_complete(struct device *dev)
1864{
1865#ifdef CONFIG_PM_DEBUG
1866 printk(KERN_INFO "iucv_pm_complete\n");
1867#endif
1868 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1869 dev->driver->pm->complete(dev);
1870}
1871
1872/**
1873 * iucv_path_table_empty() - determine if iucv path table is empty
1874 *
1875 * Returns 0 if there are still iucv pathes defined
1876 * 1 if there are no iucv pathes defined
1877 */
1878int iucv_path_table_empty(void)
1879{
1880 int i;
1881
1882 for (i = 0; i < iucv_max_pathid; i++) {
1883 if (iucv_path_table[i])
1884 return 0;
1885 }
1886 return 1;
1887}
1888
1889/**
1890 * iucv_pm_freeze() - Freeze PM callback
1891 * @dev: iucv-based device
1892 *
1893 * disable iucv interrupts
1894 * invoke callback function of the iucv-based driver
1895 * shut down iucv, if no iucv-pathes are established anymore
1896 */
1897static int iucv_pm_freeze(struct device *dev)
1898{
1899 int cpu;
1900 struct iucv_irq_list *p, *n;
1901 int rc = 0;
1902
1903#ifdef CONFIG_PM_DEBUG
1904 printk(KERN_WARNING "iucv_pm_freeze\n");
1905#endif
1906 if (iucv_pm_state != IUCV_PM_FREEZING) {
1907 for_each_cpu(cpu, &iucv_irq_cpumask)
1908 smp_call_function_single(cpu, iucv_block_cpu_almost,
1909 NULL, 1);
1910 cancel_work_sync(&iucv_work);
1911 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1912 list_del_init(&p->list);
1913 iucv_sever_pathid(p->data.ippathid,
1914 iucv_error_no_listener);
1915 kfree(p);
1916 }
1917 }
1918 iucv_pm_state = IUCV_PM_FREEZING;
1919 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1920 rc = dev->driver->pm->freeze(dev);
1921 if (iucv_path_table_empty())
1922 iucv_disable();
1923 return rc;
1924}
1925
1926/**
1927 * iucv_pm_thaw() - Thaw PM callback
1928 * @dev: iucv-based device
1929 *
1930 * make iucv ready for use again: allocate path table, declare interrupt buffers
1931 * and enable iucv interrupts
1932 * invoke callback function of the iucv-based driver
1933 */
1934static int iucv_pm_thaw(struct device *dev)
1935{
1936 int rc = 0;
1937
1938#ifdef CONFIG_PM_DEBUG
1939 printk(KERN_WARNING "iucv_pm_thaw\n");
1940#endif
1941 iucv_pm_state = IUCV_PM_THAWING;
1942 if (!iucv_path_table) {
1943 rc = iucv_enable();
1944 if (rc)
1945 goto out;
1946 }
1947 if (cpumask_empty(&iucv_irq_cpumask)) {
1948 if (iucv_nonsmp_handler)
1949 /* enable interrupts on one cpu */
1950 iucv_allow_cpu(NULL);
1951 else
1952 /* enable interrupts on all cpus */
1953 iucv_setmask_mp();
1954 }
1955 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1956 rc = dev->driver->pm->thaw(dev);
1957out:
1958 return rc;
1959}
1960
1961/**
1962 * iucv_pm_restore() - Restore PM callback
1963 * @dev: iucv-based device
1964 *
1965 * make iucv ready for use again: allocate path table, declare interrupt buffers
1966 * and enable iucv interrupts
1967 * invoke callback function of the iucv-based driver
1968 */
1969static int iucv_pm_restore(struct device *dev)
1970{
1971 int rc = 0;
1972
1973#ifdef CONFIG_PM_DEBUG
1974 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1975#endif
1976 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1977 pr_warning("Suspending Linux did not completely close all IUCV "
1978 "connections\n");
1979 iucv_pm_state = IUCV_PM_RESTORING;
1980 if (cpumask_empty(&iucv_irq_cpumask)) {
1981 rc = iucv_query_maxconn();
1982 rc = iucv_enable();
1983 if (rc)
1984 goto out;
1985 }
1986 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1987 rc = dev->driver->pm->restore(dev);
1988out:
1989 return rc;
1990}
1991
1992struct iucv_interface iucv_if = {
1993 .message_receive = iucv_message_receive,
1994 .__message_receive = __iucv_message_receive,
1995 .message_reply = iucv_message_reply,
1996 .message_reject = iucv_message_reject,
1997 .message_send = iucv_message_send,
1998 .__message_send = __iucv_message_send,
1999 .message_send2way = iucv_message_send2way,
2000 .message_purge = iucv_message_purge,
2001 .path_accept = iucv_path_accept,
2002 .path_connect = iucv_path_connect,
2003 .path_quiesce = iucv_path_quiesce,
2004 .path_resume = iucv_path_resume,
2005 .path_sever = iucv_path_sever,
2006 .iucv_register = iucv_register,
2007 .iucv_unregister = iucv_unregister,
2008 .bus = NULL,
2009 .root = NULL,
2010};
2011EXPORT_SYMBOL(iucv_if);
2012
2013/**
2014 * iucv_init
2015 *
2016 * Allocates and initializes various data structures.
2017 */
2018static int __init iucv_init(void)
2019{
2020 int rc;
2021 int cpu;
2022
2023 if (!MACHINE_IS_VM) {
2024 rc = -EPROTONOSUPPORT;
2025 goto out;
2026 }
2027 ctl_set_bit(0, 1);
2028 rc = iucv_query_maxconn();
2029 if (rc)
2030 goto out_ctl;
2031 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2032 if (rc)
2033 goto out_ctl;
2034 iucv_root = root_device_register("iucv");
2035 if (IS_ERR(iucv_root)) {
2036 rc = PTR_ERR(iucv_root);
2037 goto out_int;
2038 }
2039
2040 cpu_notifier_register_begin();
2041
2042 for_each_online_cpu(cpu) {
2043 if (alloc_iucv_data(cpu)) {
2044 rc = -ENOMEM;
2045 goto out_free;
2046 }
2047 }
2048 rc = __register_hotcpu_notifier(&iucv_cpu_notifier);
2049 if (rc)
2050 goto out_free;
2051
2052 cpu_notifier_register_done();
2053
2054 rc = register_reboot_notifier(&iucv_reboot_notifier);
2055 if (rc)
2056 goto out_cpu;
2057 ASCEBC(iucv_error_no_listener, 16);
2058 ASCEBC(iucv_error_no_memory, 16);
2059 ASCEBC(iucv_error_pathid, 16);
2060 iucv_available = 1;
2061 rc = bus_register(&iucv_bus);
2062 if (rc)
2063 goto out_reboot;
2064 iucv_if.root = iucv_root;
2065 iucv_if.bus = &iucv_bus;
2066 return 0;
2067
2068out_reboot:
2069 unregister_reboot_notifier(&iucv_reboot_notifier);
2070out_cpu:
2071 cpu_notifier_register_begin();
2072 __unregister_hotcpu_notifier(&iucv_cpu_notifier);
2073out_free:
2074 for_each_possible_cpu(cpu)
2075 free_iucv_data(cpu);
2076
2077 cpu_notifier_register_done();
2078
2079 root_device_unregister(iucv_root);
2080out_int:
2081 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2082out_ctl:
2083 ctl_clear_bit(0, 1);
2084out:
2085 return rc;
2086}
2087
2088/**
2089 * iucv_exit
2090 *
2091 * Frees everything allocated from iucv_init.
2092 */
2093static void __exit iucv_exit(void)
2094{
2095 struct iucv_irq_list *p, *n;
2096 int cpu;
2097
2098 spin_lock_irq(&iucv_queue_lock);
2099 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2100 kfree(p);
2101 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2102 kfree(p);
2103 spin_unlock_irq(&iucv_queue_lock);
2104 unregister_reboot_notifier(&iucv_reboot_notifier);
2105 cpu_notifier_register_begin();
2106 __unregister_hotcpu_notifier(&iucv_cpu_notifier);
2107 for_each_possible_cpu(cpu)
2108 free_iucv_data(cpu);
2109 cpu_notifier_register_done();
2110 root_device_unregister(iucv_root);
2111 bus_unregister(&iucv_bus);
2112 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2113}
2114
2115subsys_initcall(iucv_init);
2116module_exit(iucv_exit);
2117
2118MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2119MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2120MODULE_LICENSE("GPL");