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