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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 return -EIO;
1121
1122 parm = iucv_param[smp_processor_id()];
1123 memset(parm, 0, sizeof(union iucv_param));
1124 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1125 parm->db.ipbfln1f = (u32) size;
1126 parm->db.ipmsgid = msg->id;
1127 parm->db.ippathid = path->pathid;
1128 parm->db.iptrgcls = msg->class;
1129 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1130 IUCV_IPFGMID | IUCV_IPTRGCLS);
1131 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1132 if (!rc || rc == 5) {
1133 msg->flags = parm->db.ipflags1;
1134 if (residual)
1135 *residual = parm->db.ipbfln1f;
1136 }
1137 return rc;
1138}
1139EXPORT_SYMBOL(__iucv_message_receive);
1140
1141/**
1142 * iucv_message_receive
1143 * @path: address of iucv path structure
1144 * @msg: address of iucv msg structure
1145 * @flags: how the message is received (IUCV_IPBUFLST)
1146 * @buffer: address of data buffer or address of struct iucv_array
1147 * @size: length of data buffer
1148 * @residual:
1149 *
1150 * This function receives messages that are being sent to you over
1151 * established paths. This function will deal with RMDATA messages
1152 * embedded in struct iucv_message as well.
1153 *
1154 * Locking: local_bh_enable/local_bh_disable
1155 *
1156 * Returns the result from the CP IUCV call.
1157 */
1158int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1159 u8 flags, void *buffer, size_t size, size_t *residual)
1160{
1161 int rc;
1162
1163 if (msg->flags & IUCV_IPRMDATA)
1164 return iucv_message_receive_iprmdata(path, msg, flags,
1165 buffer, size, residual);
1166 local_bh_disable();
1167 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1168 local_bh_enable();
1169 return rc;
1170}
1171EXPORT_SYMBOL(iucv_message_receive);
1172
1173/**
1174 * iucv_message_reject
1175 * @path: address of iucv path structure
1176 * @msg: address of iucv msg structure
1177 *
1178 * The reject function refuses a specified message. Between the time you
1179 * are notified of a message and the time that you complete the message,
1180 * the message may be rejected.
1181 *
1182 * Returns the result from the CP IUCV call.
1183 */
1184int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1185{
1186 union iucv_param *parm;
1187 int rc;
1188
1189 local_bh_disable();
1190 if (cpumask_empty(&iucv_buffer_cpumask)) {
1191 rc = -EIO;
1192 goto out;
1193 }
1194 parm = iucv_param[smp_processor_id()];
1195 memset(parm, 0, sizeof(union iucv_param));
1196 parm->db.ippathid = path->pathid;
1197 parm->db.ipmsgid = msg->id;
1198 parm->db.iptrgcls = msg->class;
1199 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1200 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1201out:
1202 local_bh_enable();
1203 return rc;
1204}
1205EXPORT_SYMBOL(iucv_message_reject);
1206
1207/**
1208 * iucv_message_reply
1209 * @path: address of iucv path structure
1210 * @msg: address of iucv msg structure
1211 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1212 * @reply: address of reply data buffer or address of struct iucv_array
1213 * @size: length of reply data buffer
1214 *
1215 * This function responds to the two-way messages that you receive. You
1216 * must identify completely the message to which you wish to reply. ie,
1217 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1218 * the parameter list.
1219 *
1220 * Returns the result from the CP IUCV call.
1221 */
1222int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1223 u8 flags, void *reply, size_t size)
1224{
1225 union iucv_param *parm;
1226 int rc;
1227
1228 local_bh_disable();
1229 if (cpumask_empty(&iucv_buffer_cpumask)) {
1230 rc = -EIO;
1231 goto out;
1232 }
1233 parm = iucv_param[smp_processor_id()];
1234 memset(parm, 0, sizeof(union iucv_param));
1235 if (flags & IUCV_IPRMDATA) {
1236 parm->dpl.ippathid = path->pathid;
1237 parm->dpl.ipflags1 = flags;
1238 parm->dpl.ipmsgid = msg->id;
1239 parm->dpl.iptrgcls = msg->class;
1240 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1241 } else {
1242 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1243 parm->db.ipbfln1f = (u32) size;
1244 parm->db.ippathid = path->pathid;
1245 parm->db.ipflags1 = flags;
1246 parm->db.ipmsgid = msg->id;
1247 parm->db.iptrgcls = msg->class;
1248 }
1249 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1250out:
1251 local_bh_enable();
1252 return rc;
1253}
1254EXPORT_SYMBOL(iucv_message_reply);
1255
1256/**
1257 * __iucv_message_send
1258 * @path: address of iucv path structure
1259 * @msg: address of iucv msg structure
1260 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1261 * @srccls: source class of message
1262 * @buffer: address of send buffer or address of struct iucv_array
1263 * @size: length of send buffer
1264 *
1265 * This function transmits data to another application. Data to be
1266 * transmitted is in a buffer and this is a one-way message and the
1267 * receiver will not reply to the message.
1268 *
1269 * Locking: no locking
1270 *
1271 * Returns the result from the CP IUCV call.
1272 */
1273int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1274 u8 flags, u32 srccls, void *buffer, size_t size)
1275{
1276 union iucv_param *parm;
1277 int rc;
1278
1279 if (cpumask_empty(&iucv_buffer_cpumask)) {
1280 rc = -EIO;
1281 goto out;
1282 }
1283 parm = iucv_param[smp_processor_id()];
1284 memset(parm, 0, sizeof(union iucv_param));
1285 if (flags & IUCV_IPRMDATA) {
1286 /* Message of 8 bytes can be placed into the parameter list. */
1287 parm->dpl.ippathid = path->pathid;
1288 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1289 parm->dpl.iptrgcls = msg->class;
1290 parm->dpl.ipsrccls = srccls;
1291 parm->dpl.ipmsgtag = msg->tag;
1292 memcpy(parm->dpl.iprmmsg, buffer, 8);
1293 } else {
1294 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1295 parm->db.ipbfln1f = (u32) size;
1296 parm->db.ippathid = path->pathid;
1297 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1298 parm->db.iptrgcls = msg->class;
1299 parm->db.ipsrccls = srccls;
1300 parm->db.ipmsgtag = msg->tag;
1301 }
1302 rc = iucv_call_b2f0(IUCV_SEND, parm);
1303 if (!rc)
1304 msg->id = parm->db.ipmsgid;
1305out:
1306 return rc;
1307}
1308EXPORT_SYMBOL(__iucv_message_send);
1309
1310/**
1311 * iucv_message_send
1312 * @path: address of iucv path structure
1313 * @msg: address of iucv msg structure
1314 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1315 * @srccls: source class of message
1316 * @buffer: address of send buffer or address of struct iucv_array
1317 * @size: length of send buffer
1318 *
1319 * This function transmits data to another application. Data to be
1320 * transmitted is in a buffer and this is a one-way message and the
1321 * receiver will not reply to the message.
1322 *
1323 * Locking: local_bh_enable/local_bh_disable
1324 *
1325 * Returns the result from the CP IUCV call.
1326 */
1327int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1328 u8 flags, u32 srccls, void *buffer, size_t size)
1329{
1330 int rc;
1331
1332 local_bh_disable();
1333 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1334 local_bh_enable();
1335 return rc;
1336}
1337EXPORT_SYMBOL(iucv_message_send);
1338
1339/**
1340 * iucv_message_send2way
1341 * @path: address of iucv path structure
1342 * @msg: address of iucv msg structure
1343 * @flags: how the message is sent and the reply is received
1344 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1345 * @srccls: source class of message
1346 * @buffer: address of send buffer or address of struct iucv_array
1347 * @size: length of send buffer
1348 * @ansbuf: address of answer buffer or address of struct iucv_array
1349 * @asize: size of reply buffer
1350 *
1351 * This function transmits data to another application. Data to be
1352 * transmitted is in a buffer. The receiver of the send is expected to
1353 * reply to the message and a buffer is provided into which IUCV moves
1354 * the reply to this message.
1355 *
1356 * Returns the result from the CP IUCV call.
1357 */
1358int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1359 u8 flags, u32 srccls, void *buffer, size_t size,
1360 void *answer, size_t asize, size_t *residual)
1361{
1362 union iucv_param *parm;
1363 int rc;
1364
1365 local_bh_disable();
1366 if (cpumask_empty(&iucv_buffer_cpumask)) {
1367 rc = -EIO;
1368 goto out;
1369 }
1370 parm = iucv_param[smp_processor_id()];
1371 memset(parm, 0, sizeof(union iucv_param));
1372 if (flags & IUCV_IPRMDATA) {
1373 parm->dpl.ippathid = path->pathid;
1374 parm->dpl.ipflags1 = path->flags; /* priority message */
1375 parm->dpl.iptrgcls = msg->class;
1376 parm->dpl.ipsrccls = srccls;
1377 parm->dpl.ipmsgtag = msg->tag;
1378 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1379 parm->dpl.ipbfln2f = (u32) asize;
1380 memcpy(parm->dpl.iprmmsg, buffer, 8);
1381 } else {
1382 parm->db.ippathid = path->pathid;
1383 parm->db.ipflags1 = path->flags; /* priority message */
1384 parm->db.iptrgcls = msg->class;
1385 parm->db.ipsrccls = srccls;
1386 parm->db.ipmsgtag = msg->tag;
1387 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1388 parm->db.ipbfln1f = (u32) size;
1389 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1390 parm->db.ipbfln2f = (u32) asize;
1391 }
1392 rc = iucv_call_b2f0(IUCV_SEND, parm);
1393 if (!rc)
1394 msg->id = parm->db.ipmsgid;
1395out:
1396 local_bh_enable();
1397 return rc;
1398}
1399EXPORT_SYMBOL(iucv_message_send2way);
1400
1401/**
1402 * iucv_path_pending
1403 * @data: Pointer to external interrupt buffer
1404 *
1405 * Process connection pending work item. Called from tasklet while holding
1406 * iucv_table_lock.
1407 */
1408struct iucv_path_pending {
1409 u16 ippathid;
1410 u8 ipflags1;
1411 u8 iptype;
1412 u16 ipmsglim;
1413 u16 res1;
1414 u8 ipvmid[8];
1415 u8 ipuser[16];
1416 u32 res3;
1417 u8 ippollfg;
1418 u8 res4[3];
1419} __packed;
1420
1421static void iucv_path_pending(struct iucv_irq_data *data)
1422{
1423 struct iucv_path_pending *ipp = (void *) data;
1424 struct iucv_handler *handler;
1425 struct iucv_path *path;
1426 char *error;
1427
1428 BUG_ON(iucv_path_table[ipp->ippathid]);
1429 /* New pathid, handler found. Create a new path struct. */
1430 error = iucv_error_no_memory;
1431 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1432 if (!path)
1433 goto out_sever;
1434 path->pathid = ipp->ippathid;
1435 iucv_path_table[path->pathid] = path;
1436 EBCASC(ipp->ipvmid, 8);
1437
1438 /* Call registered handler until one is found that wants the path. */
1439 list_for_each_entry(handler, &iucv_handler_list, list) {
1440 if (!handler->path_pending)
1441 continue;
1442 /*
1443 * Add path to handler to allow a call to iucv_path_sever
1444 * inside the path_pending function. If the handler returns
1445 * an error remove the path from the handler again.
1446 */
1447 list_add(&path->list, &handler->paths);
1448 path->handler = handler;
1449 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1450 return;
1451 list_del(&path->list);
1452 path->handler = NULL;
1453 }
1454 /* No handler wanted the path. */
1455 iucv_path_table[path->pathid] = NULL;
1456 iucv_path_free(path);
1457 error = iucv_error_no_listener;
1458out_sever:
1459 iucv_sever_pathid(ipp->ippathid, error);
1460}
1461
1462/**
1463 * iucv_path_complete
1464 * @data: Pointer to external interrupt buffer
1465 *
1466 * Process connection complete work item. Called from tasklet while holding
1467 * iucv_table_lock.
1468 */
1469struct iucv_path_complete {
1470 u16 ippathid;
1471 u8 ipflags1;
1472 u8 iptype;
1473 u16 ipmsglim;
1474 u16 res1;
1475 u8 res2[8];
1476 u8 ipuser[16];
1477 u32 res3;
1478 u8 ippollfg;
1479 u8 res4[3];
1480} __packed;
1481
1482static void iucv_path_complete(struct iucv_irq_data *data)
1483{
1484 struct iucv_path_complete *ipc = (void *) data;
1485 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1486
1487 if (path)
1488 path->flags = ipc->ipflags1;
1489 if (path && path->handler && path->handler->path_complete)
1490 path->handler->path_complete(path, ipc->ipuser);
1491}
1492
1493/**
1494 * iucv_path_severed
1495 * @data: Pointer to external interrupt buffer
1496 *
1497 * Process connection severed work item. Called from tasklet while holding
1498 * iucv_table_lock.
1499 */
1500struct iucv_path_severed {
1501 u16 ippathid;
1502 u8 res1;
1503 u8 iptype;
1504 u32 res2;
1505 u8 res3[8];
1506 u8 ipuser[16];
1507 u32 res4;
1508 u8 ippollfg;
1509 u8 res5[3];
1510} __packed;
1511
1512static void iucv_path_severed(struct iucv_irq_data *data)
1513{
1514 struct iucv_path_severed *ips = (void *) data;
1515 struct iucv_path *path = iucv_path_table[ips->ippathid];
1516
1517 if (!path || !path->handler) /* Already severed */
1518 return;
1519 if (path->handler->path_severed)
1520 path->handler->path_severed(path, ips->ipuser);
1521 else {
1522 iucv_sever_pathid(path->pathid, NULL);
1523 iucv_path_table[path->pathid] = NULL;
1524 list_del(&path->list);
1525 iucv_path_free(path);
1526 }
1527}
1528
1529/**
1530 * iucv_path_quiesced
1531 * @data: Pointer to external interrupt buffer
1532 *
1533 * Process connection quiesced work item. Called from tasklet while holding
1534 * iucv_table_lock.
1535 */
1536struct iucv_path_quiesced {
1537 u16 ippathid;
1538 u8 res1;
1539 u8 iptype;
1540 u32 res2;
1541 u8 res3[8];
1542 u8 ipuser[16];
1543 u32 res4;
1544 u8 ippollfg;
1545 u8 res5[3];
1546} __packed;
1547
1548static void iucv_path_quiesced(struct iucv_irq_data *data)
1549{
1550 struct iucv_path_quiesced *ipq = (void *) data;
1551 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1552
1553 if (path && path->handler && path->handler->path_quiesced)
1554 path->handler->path_quiesced(path, ipq->ipuser);
1555}
1556
1557/**
1558 * iucv_path_resumed
1559 * @data: Pointer to external interrupt buffer
1560 *
1561 * Process connection resumed work item. Called from tasklet while holding
1562 * iucv_table_lock.
1563 */
1564struct iucv_path_resumed {
1565 u16 ippathid;
1566 u8 res1;
1567 u8 iptype;
1568 u32 res2;
1569 u8 res3[8];
1570 u8 ipuser[16];
1571 u32 res4;
1572 u8 ippollfg;
1573 u8 res5[3];
1574} __packed;
1575
1576static void iucv_path_resumed(struct iucv_irq_data *data)
1577{
1578 struct iucv_path_resumed *ipr = (void *) data;
1579 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1580
1581 if (path && path->handler && path->handler->path_resumed)
1582 path->handler->path_resumed(path, ipr->ipuser);
1583}
1584
1585/**
1586 * iucv_message_complete
1587 * @data: Pointer to external interrupt buffer
1588 *
1589 * Process message complete work item. Called from tasklet while holding
1590 * iucv_table_lock.
1591 */
1592struct iucv_message_complete {
1593 u16 ippathid;
1594 u8 ipflags1;
1595 u8 iptype;
1596 u32 ipmsgid;
1597 u32 ipaudit;
1598 u8 iprmmsg[8];
1599 u32 ipsrccls;
1600 u32 ipmsgtag;
1601 u32 res;
1602 u32 ipbfln2f;
1603 u8 ippollfg;
1604 u8 res2[3];
1605} __packed;
1606
1607static void iucv_message_complete(struct iucv_irq_data *data)
1608{
1609 struct iucv_message_complete *imc = (void *) data;
1610 struct iucv_path *path = iucv_path_table[imc->ippathid];
1611 struct iucv_message msg;
1612
1613 if (path && path->handler && path->handler->message_complete) {
1614 msg.flags = imc->ipflags1;
1615 msg.id = imc->ipmsgid;
1616 msg.audit = imc->ipaudit;
1617 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1618 msg.class = imc->ipsrccls;
1619 msg.tag = imc->ipmsgtag;
1620 msg.length = imc->ipbfln2f;
1621 path->handler->message_complete(path, &msg);
1622 }
1623}
1624
1625/**
1626 * iucv_message_pending
1627 * @data: Pointer to external interrupt buffer
1628 *
1629 * Process message pending work item. Called from tasklet while holding
1630 * iucv_table_lock.
1631 */
1632struct iucv_message_pending {
1633 u16 ippathid;
1634 u8 ipflags1;
1635 u8 iptype;
1636 u32 ipmsgid;
1637 u32 iptrgcls;
1638 struct {
1639 union {
1640 u32 iprmmsg1_u32;
1641 u8 iprmmsg1[4];
1642 } ln1msg1;
1643 union {
1644 u32 ipbfln1f;
1645 u8 iprmmsg2[4];
1646 } ln1msg2;
1647 } rmmsg;
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->rmmsg, 8);
1666 msg.length = 8;
1667 } else
1668 msg.length = imp->rmmsg.ln1msg2.ipbfln1f;
1669 msg.reply_size = imp->ipbfln2f;
1670 path->handler->message_pending(path, &msg);
1671 }
1672}
1673
1674/**
1675 * iucv_tasklet_fn:
1676 *
1677 * This tasklet loops over the queue of irq buffers created by
1678 * iucv_external_interrupt, calls the appropriate action handler
1679 * and then frees the buffer.
1680 */
1681static void iucv_tasklet_fn(unsigned long ignored)
1682{
1683 typedef void iucv_irq_fn(struct iucv_irq_data *);
1684 static iucv_irq_fn *irq_fn[] = {
1685 [0x02] = iucv_path_complete,
1686 [0x03] = iucv_path_severed,
1687 [0x04] = iucv_path_quiesced,
1688 [0x05] = iucv_path_resumed,
1689 [0x06] = iucv_message_complete,
1690 [0x07] = iucv_message_complete,
1691 [0x08] = iucv_message_pending,
1692 [0x09] = iucv_message_pending,
1693 };
1694 LIST_HEAD(task_queue);
1695 struct iucv_irq_list *p, *n;
1696
1697 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1698 if (!spin_trylock(&iucv_table_lock)) {
1699 tasklet_schedule(&iucv_tasklet);
1700 return;
1701 }
1702 iucv_active_cpu = smp_processor_id();
1703
1704 spin_lock_irq(&iucv_queue_lock);
1705 list_splice_init(&iucv_task_queue, &task_queue);
1706 spin_unlock_irq(&iucv_queue_lock);
1707
1708 list_for_each_entry_safe(p, n, &task_queue, list) {
1709 list_del_init(&p->list);
1710 irq_fn[p->data.iptype](&p->data);
1711 kfree(p);
1712 }
1713
1714 iucv_active_cpu = -1;
1715 spin_unlock(&iucv_table_lock);
1716}
1717
1718/**
1719 * iucv_work_fn:
1720 *
1721 * This work function loops over the queue of path pending irq blocks
1722 * created by iucv_external_interrupt, calls the appropriate action
1723 * handler and then frees the buffer.
1724 */
1725static void iucv_work_fn(struct work_struct *work)
1726{
1727 LIST_HEAD(work_queue);
1728 struct iucv_irq_list *p, *n;
1729
1730 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1731 spin_lock_bh(&iucv_table_lock);
1732 iucv_active_cpu = smp_processor_id();
1733
1734 spin_lock_irq(&iucv_queue_lock);
1735 list_splice_init(&iucv_work_queue, &work_queue);
1736 spin_unlock_irq(&iucv_queue_lock);
1737
1738 iucv_cleanup_queue();
1739 list_for_each_entry_safe(p, n, &work_queue, list) {
1740 list_del_init(&p->list);
1741 iucv_path_pending(&p->data);
1742 kfree(p);
1743 }
1744
1745 iucv_active_cpu = -1;
1746 spin_unlock_bh(&iucv_table_lock);
1747}
1748
1749/**
1750 * iucv_external_interrupt
1751 * @code: irq code
1752 *
1753 * Handles external interrupts coming in from CP.
1754 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1755 */
1756static void iucv_external_interrupt(struct ext_code ext_code,
1757 unsigned int param32, unsigned long param64)
1758{
1759 struct iucv_irq_data *p;
1760 struct iucv_irq_list *work;
1761
1762 inc_irq_stat(IRQEXT_IUC);
1763 p = iucv_irq_data[smp_processor_id()];
1764 if (p->ippathid >= iucv_max_pathid) {
1765 WARN_ON(p->ippathid >= iucv_max_pathid);
1766 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1767 return;
1768 }
1769 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1770 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1771 if (!work) {
1772 pr_warn("iucv_external_interrupt: out of memory\n");
1773 return;
1774 }
1775 memcpy(&work->data, p, sizeof(work->data));
1776 spin_lock(&iucv_queue_lock);
1777 if (p->iptype == 0x01) {
1778 /* Path pending interrupt. */
1779 list_add_tail(&work->list, &iucv_work_queue);
1780 schedule_work(&iucv_work);
1781 } else {
1782 /* The other interrupts. */
1783 list_add_tail(&work->list, &iucv_task_queue);
1784 tasklet_schedule(&iucv_tasklet);
1785 }
1786 spin_unlock(&iucv_queue_lock);
1787}
1788
1789struct iucv_interface iucv_if = {
1790 .message_receive = iucv_message_receive,
1791 .__message_receive = __iucv_message_receive,
1792 .message_reply = iucv_message_reply,
1793 .message_reject = iucv_message_reject,
1794 .message_send = iucv_message_send,
1795 .__message_send = __iucv_message_send,
1796 .message_send2way = iucv_message_send2way,
1797 .message_purge = iucv_message_purge,
1798 .path_accept = iucv_path_accept,
1799 .path_connect = iucv_path_connect,
1800 .path_quiesce = iucv_path_quiesce,
1801 .path_resume = iucv_path_resume,
1802 .path_sever = iucv_path_sever,
1803 .iucv_register = iucv_register,
1804 .iucv_unregister = iucv_unregister,
1805 .bus = NULL,
1806 .root = NULL,
1807};
1808EXPORT_SYMBOL(iucv_if);
1809
1810static enum cpuhp_state iucv_online;
1811/**
1812 * iucv_init
1813 *
1814 * Allocates and initializes various data structures.
1815 */
1816static int __init iucv_init(void)
1817{
1818 int rc;
1819
1820 if (!MACHINE_IS_VM) {
1821 rc = -EPROTONOSUPPORT;
1822 goto out;
1823 }
1824 ctl_set_bit(0, 1);
1825 rc = iucv_query_maxconn();
1826 if (rc)
1827 goto out_ctl;
1828 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1829 if (rc)
1830 goto out_ctl;
1831 iucv_root = root_device_register("iucv");
1832 if (IS_ERR(iucv_root)) {
1833 rc = PTR_ERR(iucv_root);
1834 goto out_int;
1835 }
1836
1837 rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
1838 iucv_cpu_prepare, iucv_cpu_dead);
1839 if (rc)
1840 goto out_dev;
1841 rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
1842 iucv_cpu_online, iucv_cpu_down_prep);
1843 if (rc < 0)
1844 goto out_prep;
1845 iucv_online = rc;
1846
1847 rc = register_reboot_notifier(&iucv_reboot_notifier);
1848 if (rc)
1849 goto out_remove_hp;
1850 ASCEBC(iucv_error_no_listener, 16);
1851 ASCEBC(iucv_error_no_memory, 16);
1852 ASCEBC(iucv_error_pathid, 16);
1853 iucv_available = 1;
1854 rc = bus_register(&iucv_bus);
1855 if (rc)
1856 goto out_reboot;
1857 iucv_if.root = iucv_root;
1858 iucv_if.bus = &iucv_bus;
1859 return 0;
1860
1861out_reboot:
1862 unregister_reboot_notifier(&iucv_reboot_notifier);
1863out_remove_hp:
1864 cpuhp_remove_state(iucv_online);
1865out_prep:
1866 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1867out_dev:
1868 root_device_unregister(iucv_root);
1869out_int:
1870 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1871out_ctl:
1872 ctl_clear_bit(0, 1);
1873out:
1874 return rc;
1875}
1876
1877/**
1878 * iucv_exit
1879 *
1880 * Frees everything allocated from iucv_init.
1881 */
1882static void __exit iucv_exit(void)
1883{
1884 struct iucv_irq_list *p, *n;
1885
1886 spin_lock_irq(&iucv_queue_lock);
1887 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1888 kfree(p);
1889 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1890 kfree(p);
1891 spin_unlock_irq(&iucv_queue_lock);
1892 unregister_reboot_notifier(&iucv_reboot_notifier);
1893
1894 cpuhp_remove_state_nocalls(iucv_online);
1895 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1896 root_device_unregister(iucv_root);
1897 bus_unregister(&iucv_bus);
1898 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1899}
1900
1901subsys_initcall(iucv_init);
1902module_exit(iucv_exit);
1903
1904MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1905MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1906MODULE_LICENSE("GPL");
1/*
2 * IUCV base infrastructure.
3 *
4 * Copyright IBM Corp. 2001, 2009
5 *
6 * Author(s):
7 * Original source:
8 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
9 * Xenia Tkatschow (xenia@us.ibm.com)
10 * 2Gb awareness and general cleanup:
11 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
12 * Rewritten for af_iucv:
13 * Martin Schwidefsky <schwidefsky@de.ibm.com>
14 * PM functions:
15 * Ursula Braun (ursula.braun@de.ibm.com)
16 *
17 * Documentation used:
18 * The original source
19 * CP Programming Service, IBM document # SC24-5760
20 *
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2, or (at your option)
24 * any later version.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 */
35
36#define KMSG_COMPONENT "iucv"
37#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
38
39#include <linux/kernel_stat.h>
40#include <linux/module.h>
41#include <linux/moduleparam.h>
42#include <linux/spinlock.h>
43#include <linux/kernel.h>
44#include <linux/slab.h>
45#include <linux/init.h>
46#include <linux/interrupt.h>
47#include <linux/list.h>
48#include <linux/errno.h>
49#include <linux/err.h>
50#include <linux/device.h>
51#include <linux/cpu.h>
52#include <linux/reboot.h>
53#include <net/iucv/iucv.h>
54#include <linux/atomic.h>
55#include <asm/ebcdic.h>
56#include <asm/io.h>
57#include <asm/irq.h>
58#include <asm/smp.h>
59
60/*
61 * FLAGS:
62 * All flags are defined in the field IPFLAGS1 of each function
63 * and can be found in CP Programming Services.
64 * IPSRCCLS - Indicates you have specified a source class.
65 * IPTRGCLS - Indicates you have specified a target class.
66 * IPFGPID - Indicates you have specified a pathid.
67 * IPFGMID - Indicates you have specified a message ID.
68 * IPNORPY - Indicates a one-way message. No reply expected.
69 * IPALL - Indicates that all paths are affected.
70 */
71#define IUCV_IPSRCCLS 0x01
72#define IUCV_IPTRGCLS 0x01
73#define IUCV_IPFGPID 0x02
74#define IUCV_IPFGMID 0x04
75#define IUCV_IPNORPY 0x10
76#define IUCV_IPALL 0x80
77
78static int iucv_bus_match(struct device *dev, struct device_driver *drv)
79{
80 return 0;
81}
82
83enum iucv_pm_states {
84 IUCV_PM_INITIAL = 0,
85 IUCV_PM_FREEZING = 1,
86 IUCV_PM_THAWING = 2,
87 IUCV_PM_RESTORING = 3,
88};
89static enum iucv_pm_states iucv_pm_state;
90
91static int iucv_pm_prepare(struct device *);
92static void iucv_pm_complete(struct device *);
93static int iucv_pm_freeze(struct device *);
94static int iucv_pm_thaw(struct device *);
95static int iucv_pm_restore(struct device *);
96
97static const struct dev_pm_ops iucv_pm_ops = {
98 .prepare = iucv_pm_prepare,
99 .complete = iucv_pm_complete,
100 .freeze = iucv_pm_freeze,
101 .thaw = iucv_pm_thaw,
102 .restore = iucv_pm_restore,
103};
104
105struct bus_type iucv_bus = {
106 .name = "iucv",
107 .match = iucv_bus_match,
108 .pm = &iucv_pm_ops,
109};
110EXPORT_SYMBOL(iucv_bus);
111
112struct device *iucv_root;
113EXPORT_SYMBOL(iucv_root);
114
115static int iucv_available;
116
117/* General IUCV interrupt structure */
118struct iucv_irq_data {
119 u16 ippathid;
120 u8 ipflags1;
121 u8 iptype;
122 u32 res2[8];
123};
124
125struct iucv_irq_list {
126 struct list_head list;
127 struct iucv_irq_data data;
128};
129
130static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
131static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
132static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
133
134/*
135 * Queue of interrupt buffers lock for delivery via the tasklet
136 * (fast but can't call smp_call_function).
137 */
138static LIST_HEAD(iucv_task_queue);
139
140/*
141 * The tasklet for fast delivery of iucv interrupts.
142 */
143static void iucv_tasklet_fn(unsigned long);
144static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
145
146/*
147 * Queue of interrupt buffers for delivery via a work queue
148 * (slower but can call smp_call_function).
149 */
150static LIST_HEAD(iucv_work_queue);
151
152/*
153 * The work element to deliver path pending interrupts.
154 */
155static void iucv_work_fn(struct work_struct *work);
156static DECLARE_WORK(iucv_work, iucv_work_fn);
157
158/*
159 * Spinlock protecting task and work queue.
160 */
161static DEFINE_SPINLOCK(iucv_queue_lock);
162
163enum iucv_command_codes {
164 IUCV_QUERY = 0,
165 IUCV_RETRIEVE_BUFFER = 2,
166 IUCV_SEND = 4,
167 IUCV_RECEIVE = 5,
168 IUCV_REPLY = 6,
169 IUCV_REJECT = 8,
170 IUCV_PURGE = 9,
171 IUCV_ACCEPT = 10,
172 IUCV_CONNECT = 11,
173 IUCV_DECLARE_BUFFER = 12,
174 IUCV_QUIESCE = 13,
175 IUCV_RESUME = 14,
176 IUCV_SEVER = 15,
177 IUCV_SETMASK = 16,
178 IUCV_SETCONTROLMASK = 17,
179};
180
181/*
182 * Error messages that are used with the iucv_sever function. They get
183 * converted to EBCDIC.
184 */
185static char iucv_error_no_listener[16] = "NO LISTENER";
186static char iucv_error_no_memory[16] = "NO MEMORY";
187static char iucv_error_pathid[16] = "INVALID PATHID";
188
189/*
190 * iucv_handler_list: List of registered handlers.
191 */
192static LIST_HEAD(iucv_handler_list);
193
194/*
195 * iucv_path_table: an array of iucv_path structures.
196 */
197static struct iucv_path **iucv_path_table;
198static unsigned long iucv_max_pathid;
199
200/*
201 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
202 */
203static DEFINE_SPINLOCK(iucv_table_lock);
204
205/*
206 * iucv_active_cpu: contains the number of the cpu executing the tasklet
207 * or the work handler. Needed for iucv_path_sever called from tasklet.
208 */
209static int iucv_active_cpu = -1;
210
211/*
212 * Mutex and wait queue for iucv_register/iucv_unregister.
213 */
214static DEFINE_MUTEX(iucv_register_mutex);
215
216/*
217 * Counter for number of non-smp capable handlers.
218 */
219static int iucv_nonsmp_handler;
220
221/*
222 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
223 * iucv_path_quiesce and iucv_path_sever.
224 */
225struct iucv_cmd_control {
226 u16 ippathid;
227 u8 ipflags1;
228 u8 iprcode;
229 u16 ipmsglim;
230 u16 res1;
231 u8 ipvmid[8];
232 u8 ipuser[16];
233 u8 iptarget[8];
234} __attribute__ ((packed,aligned(8)));
235
236/*
237 * Data in parameter list iucv structure. Used by iucv_message_send,
238 * iucv_message_send2way and iucv_message_reply.
239 */
240struct iucv_cmd_dpl {
241 u16 ippathid;
242 u8 ipflags1;
243 u8 iprcode;
244 u32 ipmsgid;
245 u32 iptrgcls;
246 u8 iprmmsg[8];
247 u32 ipsrccls;
248 u32 ipmsgtag;
249 u32 ipbfadr2;
250 u32 ipbfln2f;
251 u32 res;
252} __attribute__ ((packed,aligned(8)));
253
254/*
255 * Data in buffer iucv structure. Used by iucv_message_receive,
256 * iucv_message_reject, iucv_message_send, iucv_message_send2way
257 * and iucv_declare_cpu.
258 */
259struct iucv_cmd_db {
260 u16 ippathid;
261 u8 ipflags1;
262 u8 iprcode;
263 u32 ipmsgid;
264 u32 iptrgcls;
265 u32 ipbfadr1;
266 u32 ipbfln1f;
267 u32 ipsrccls;
268 u32 ipmsgtag;
269 u32 ipbfadr2;
270 u32 ipbfln2f;
271 u32 res;
272} __attribute__ ((packed,aligned(8)));
273
274/*
275 * Purge message iucv structure. Used by iucv_message_purge.
276 */
277struct iucv_cmd_purge {
278 u16 ippathid;
279 u8 ipflags1;
280 u8 iprcode;
281 u32 ipmsgid;
282 u8 ipaudit[3];
283 u8 res1[5];
284 u32 res2;
285 u32 ipsrccls;
286 u32 ipmsgtag;
287 u32 res3[3];
288} __attribute__ ((packed,aligned(8)));
289
290/*
291 * Set mask iucv structure. Used by iucv_enable_cpu.
292 */
293struct iucv_cmd_set_mask {
294 u8 ipmask;
295 u8 res1[2];
296 u8 iprcode;
297 u32 res2[9];
298} __attribute__ ((packed,aligned(8)));
299
300union iucv_param {
301 struct iucv_cmd_control ctrl;
302 struct iucv_cmd_dpl dpl;
303 struct iucv_cmd_db db;
304 struct iucv_cmd_purge purge;
305 struct iucv_cmd_set_mask set_mask;
306};
307
308/*
309 * Anchor for per-cpu IUCV command parameter block.
310 */
311static union iucv_param *iucv_param[NR_CPUS];
312static union iucv_param *iucv_param_irq[NR_CPUS];
313
314/**
315 * iucv_call_b2f0
316 * @code: identifier of IUCV call to CP.
317 * @parm: pointer to a struct iucv_parm block
318 *
319 * Calls CP to execute IUCV commands.
320 *
321 * Returns the result of the CP IUCV call.
322 */
323static inline int iucv_call_b2f0(int command, union iucv_param *parm)
324{
325 register unsigned long reg0 asm ("0");
326 register unsigned long reg1 asm ("1");
327 int ccode;
328
329 reg0 = command;
330 reg1 = virt_to_phys(parm);
331 asm volatile(
332 " .long 0xb2f01000\n"
333 " ipm %0\n"
334 " srl %0,28\n"
335 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
336 : "m" (*parm) : "cc");
337 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
338}
339
340/**
341 * iucv_query_maxconn
342 *
343 * Determines the maximum number of connections that may be established.
344 *
345 * Returns the maximum number of connections or -EPERM is IUCV is not
346 * available.
347 */
348static int iucv_query_maxconn(void)
349{
350 register unsigned long reg0 asm ("0");
351 register unsigned long reg1 asm ("1");
352 void *param;
353 int ccode;
354
355 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
356 if (!param)
357 return -ENOMEM;
358 reg0 = IUCV_QUERY;
359 reg1 = (unsigned long) param;
360 asm volatile (
361 " .long 0xb2f01000\n"
362 " ipm %0\n"
363 " srl %0,28\n"
364 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
365 if (ccode == 0)
366 iucv_max_pathid = reg1;
367 kfree(param);
368 return ccode ? -EPERM : 0;
369}
370
371/**
372 * iucv_allow_cpu
373 * @data: unused
374 *
375 * Allow iucv interrupts on this cpu.
376 */
377static void iucv_allow_cpu(void *data)
378{
379 int cpu = smp_processor_id();
380 union iucv_param *parm;
381
382 /*
383 * Enable all iucv interrupts.
384 * ipmask contains bits for the different interrupts
385 * 0x80 - Flag to allow nonpriority message pending interrupts
386 * 0x40 - Flag to allow priority message pending interrupts
387 * 0x20 - Flag to allow nonpriority message completion interrupts
388 * 0x10 - Flag to allow priority message completion interrupts
389 * 0x08 - Flag to allow IUCV control interrupts
390 */
391 parm = iucv_param_irq[cpu];
392 memset(parm, 0, sizeof(union iucv_param));
393 parm->set_mask.ipmask = 0xf8;
394 iucv_call_b2f0(IUCV_SETMASK, parm);
395
396 /*
397 * Enable all iucv control interrupts.
398 * ipmask contains bits for the different interrupts
399 * 0x80 - Flag to allow pending connections interrupts
400 * 0x40 - Flag to allow connection complete interrupts
401 * 0x20 - Flag to allow connection severed interrupts
402 * 0x10 - Flag to allow connection quiesced interrupts
403 * 0x08 - Flag to allow connection resumed interrupts
404 */
405 memset(parm, 0, sizeof(union iucv_param));
406 parm->set_mask.ipmask = 0xf8;
407 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
408 /* Set indication that iucv interrupts are allowed for this cpu. */
409 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
410}
411
412/**
413 * iucv_block_cpu
414 * @data: unused
415 *
416 * Block iucv interrupts on this cpu.
417 */
418static void iucv_block_cpu(void *data)
419{
420 int cpu = smp_processor_id();
421 union iucv_param *parm;
422
423 /* Disable all iucv interrupts. */
424 parm = iucv_param_irq[cpu];
425 memset(parm, 0, sizeof(union iucv_param));
426 iucv_call_b2f0(IUCV_SETMASK, parm);
427
428 /* Clear indication that iucv interrupts are allowed for this cpu. */
429 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
430}
431
432/**
433 * iucv_block_cpu_almost
434 * @data: unused
435 *
436 * Allow connection-severed interrupts only on this cpu.
437 */
438static void iucv_block_cpu_almost(void *data)
439{
440 int cpu = smp_processor_id();
441 union iucv_param *parm;
442
443 /* Allow iucv control interrupts only */
444 parm = iucv_param_irq[cpu];
445 memset(parm, 0, sizeof(union iucv_param));
446 parm->set_mask.ipmask = 0x08;
447 iucv_call_b2f0(IUCV_SETMASK, parm);
448 /* Allow iucv-severed interrupt only */
449 memset(parm, 0, sizeof(union iucv_param));
450 parm->set_mask.ipmask = 0x20;
451 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
452
453 /* Clear indication that iucv interrupts are allowed for this cpu. */
454 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
455}
456
457/**
458 * iucv_declare_cpu
459 * @data: unused
460 *
461 * Declare a interrupt buffer on this cpu.
462 */
463static void iucv_declare_cpu(void *data)
464{
465 int cpu = smp_processor_id();
466 union iucv_param *parm;
467 int rc;
468
469 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
470 return;
471
472 /* Declare interrupt buffer. */
473 parm = iucv_param_irq[cpu];
474 memset(parm, 0, sizeof(union iucv_param));
475 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
476 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
477 if (rc) {
478 char *err = "Unknown";
479 switch (rc) {
480 case 0x03:
481 err = "Directory error";
482 break;
483 case 0x0a:
484 err = "Invalid length";
485 break;
486 case 0x13:
487 err = "Buffer already exists";
488 break;
489 case 0x3e:
490 err = "Buffer overlap";
491 break;
492 case 0x5c:
493 err = "Paging or storage error";
494 break;
495 }
496 pr_warning("Defining an interrupt buffer on CPU %i"
497 " failed with 0x%02x (%s)\n", cpu, rc, err);
498 return;
499 }
500
501 /* Set indication that an iucv buffer exists for this cpu. */
502 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
503
504 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
505 /* Enable iucv interrupts on this cpu. */
506 iucv_allow_cpu(NULL);
507 else
508 /* Disable iucv interrupts on this cpu. */
509 iucv_block_cpu(NULL);
510}
511
512/**
513 * iucv_retrieve_cpu
514 * @data: unused
515 *
516 * Retrieve interrupt buffer on this cpu.
517 */
518static void iucv_retrieve_cpu(void *data)
519{
520 int cpu = smp_processor_id();
521 union iucv_param *parm;
522
523 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
524 return;
525
526 /* Block iucv interrupts. */
527 iucv_block_cpu(NULL);
528
529 /* Retrieve interrupt buffer. */
530 parm = iucv_param_irq[cpu];
531 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
532
533 /* Clear indication that an iucv buffer exists for this cpu. */
534 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
535}
536
537/**
538 * iucv_setmask_smp
539 *
540 * Allow iucv interrupts on all cpus.
541 */
542static void iucv_setmask_mp(void)
543{
544 int cpu;
545
546 get_online_cpus();
547 for_each_online_cpu(cpu)
548 /* Enable all cpus with a declared buffer. */
549 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
550 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
551 smp_call_function_single(cpu, iucv_allow_cpu,
552 NULL, 1);
553 put_online_cpus();
554}
555
556/**
557 * iucv_setmask_up
558 *
559 * Allow iucv interrupts on a single cpu.
560 */
561static void iucv_setmask_up(void)
562{
563 cpumask_t cpumask;
564 int cpu;
565
566 /* Disable all cpu but the first in cpu_irq_cpumask. */
567 cpumask_copy(&cpumask, &iucv_irq_cpumask);
568 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
569 for_each_cpu(cpu, &cpumask)
570 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
571}
572
573/**
574 * iucv_enable
575 *
576 * This function makes iucv ready for use. It allocates the pathid
577 * table, declares an iucv interrupt buffer and enables the iucv
578 * interrupts. Called when the first user has registered an iucv
579 * handler.
580 */
581static int iucv_enable(void)
582{
583 size_t alloc_size;
584 int cpu, rc;
585
586 get_online_cpus();
587 rc = -ENOMEM;
588 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
589 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
590 if (!iucv_path_table)
591 goto out;
592 /* Declare per cpu buffers. */
593 rc = -EIO;
594 for_each_online_cpu(cpu)
595 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
596 if (cpumask_empty(&iucv_buffer_cpumask))
597 /* No cpu could declare an iucv buffer. */
598 goto out;
599 put_online_cpus();
600 return 0;
601out:
602 kfree(iucv_path_table);
603 iucv_path_table = NULL;
604 put_online_cpus();
605 return rc;
606}
607
608/**
609 * iucv_disable
610 *
611 * This function shuts down iucv. It disables iucv interrupts, retrieves
612 * the iucv interrupt buffer and frees the pathid table. Called after the
613 * last user unregister its iucv handler.
614 */
615static void iucv_disable(void)
616{
617 get_online_cpus();
618 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
619 kfree(iucv_path_table);
620 iucv_path_table = NULL;
621 put_online_cpus();
622}
623
624static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
625 unsigned long action, void *hcpu)
626{
627 cpumask_t cpumask;
628 long cpu = (long) hcpu;
629
630 switch (action) {
631 case CPU_UP_PREPARE:
632 case CPU_UP_PREPARE_FROZEN:
633 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
634 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
635 if (!iucv_irq_data[cpu])
636 return notifier_from_errno(-ENOMEM);
637
638 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
639 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
640 if (!iucv_param[cpu]) {
641 kfree(iucv_irq_data[cpu]);
642 iucv_irq_data[cpu] = NULL;
643 return notifier_from_errno(-ENOMEM);
644 }
645 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
646 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
647 if (!iucv_param_irq[cpu]) {
648 kfree(iucv_param[cpu]);
649 iucv_param[cpu] = NULL;
650 kfree(iucv_irq_data[cpu]);
651 iucv_irq_data[cpu] = NULL;
652 return notifier_from_errno(-ENOMEM);
653 }
654 break;
655 case CPU_UP_CANCELED:
656 case CPU_UP_CANCELED_FROZEN:
657 case CPU_DEAD:
658 case CPU_DEAD_FROZEN:
659 kfree(iucv_param_irq[cpu]);
660 iucv_param_irq[cpu] = NULL;
661 kfree(iucv_param[cpu]);
662 iucv_param[cpu] = NULL;
663 kfree(iucv_irq_data[cpu]);
664 iucv_irq_data[cpu] = NULL;
665 break;
666 case CPU_ONLINE:
667 case CPU_ONLINE_FROZEN:
668 case CPU_DOWN_FAILED:
669 case CPU_DOWN_FAILED_FROZEN:
670 if (!iucv_path_table)
671 break;
672 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
673 break;
674 case CPU_DOWN_PREPARE:
675 case CPU_DOWN_PREPARE_FROZEN:
676 if (!iucv_path_table)
677 break;
678 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
679 cpumask_clear_cpu(cpu, &cpumask);
680 if (cpumask_empty(&cpumask))
681 /* Can't offline last IUCV enabled cpu. */
682 return notifier_from_errno(-EINVAL);
683 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
684 if (cpumask_empty(&iucv_irq_cpumask))
685 smp_call_function_single(
686 cpumask_first(&iucv_buffer_cpumask),
687 iucv_allow_cpu, NULL, 1);
688 break;
689 }
690 return NOTIFY_OK;
691}
692
693static struct notifier_block __refdata iucv_cpu_notifier = {
694 .notifier_call = iucv_cpu_notify,
695};
696
697/**
698 * iucv_sever_pathid
699 * @pathid: path identification number.
700 * @userdata: 16-bytes of user data.
701 *
702 * Sever an iucv path to free up the pathid. Used internally.
703 */
704static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
705{
706 union iucv_param *parm;
707
708 parm = iucv_param_irq[smp_processor_id()];
709 memset(parm, 0, sizeof(union iucv_param));
710 if (userdata)
711 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
712 parm->ctrl.ippathid = pathid;
713 return iucv_call_b2f0(IUCV_SEVER, parm);
714}
715
716/**
717 * __iucv_cleanup_queue
718 * @dummy: unused dummy argument
719 *
720 * Nop function called via smp_call_function to force work items from
721 * pending external iucv interrupts to the work queue.
722 */
723static void __iucv_cleanup_queue(void *dummy)
724{
725}
726
727/**
728 * iucv_cleanup_queue
729 *
730 * Function called after a path has been severed to find all remaining
731 * work items for the now stale pathid. The caller needs to hold the
732 * iucv_table_lock.
733 */
734static void iucv_cleanup_queue(void)
735{
736 struct iucv_irq_list *p, *n;
737
738 /*
739 * When a path is severed, the pathid can be reused immediately
740 * on a iucv connect or a connection pending interrupt. Remove
741 * all entries from the task queue that refer to a stale pathid
742 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
743 * or deliver the connection pending interrupt. To get all the
744 * pending interrupts force them to the work queue by calling
745 * an empty function on all cpus.
746 */
747 smp_call_function(__iucv_cleanup_queue, NULL, 1);
748 spin_lock_irq(&iucv_queue_lock);
749 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
750 /* Remove stale work items from the task queue. */
751 if (iucv_path_table[p->data.ippathid] == NULL) {
752 list_del(&p->list);
753 kfree(p);
754 }
755 }
756 spin_unlock_irq(&iucv_queue_lock);
757}
758
759/**
760 * iucv_register:
761 * @handler: address of iucv handler structure
762 * @smp: != 0 indicates that the handler can deal with out of order messages
763 *
764 * Registers a driver with IUCV.
765 *
766 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
767 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
768 */
769int iucv_register(struct iucv_handler *handler, int smp)
770{
771 int rc;
772
773 if (!iucv_available)
774 return -ENOSYS;
775 mutex_lock(&iucv_register_mutex);
776 if (!smp)
777 iucv_nonsmp_handler++;
778 if (list_empty(&iucv_handler_list)) {
779 rc = iucv_enable();
780 if (rc)
781 goto out_mutex;
782 } else if (!smp && iucv_nonsmp_handler == 1)
783 iucv_setmask_up();
784 INIT_LIST_HEAD(&handler->paths);
785
786 spin_lock_bh(&iucv_table_lock);
787 list_add_tail(&handler->list, &iucv_handler_list);
788 spin_unlock_bh(&iucv_table_lock);
789 rc = 0;
790out_mutex:
791 mutex_unlock(&iucv_register_mutex);
792 return rc;
793}
794EXPORT_SYMBOL(iucv_register);
795
796/**
797 * iucv_unregister
798 * @handler: address of iucv handler structure
799 * @smp: != 0 indicates that the handler can deal with out of order messages
800 *
801 * Unregister driver from IUCV.
802 */
803void iucv_unregister(struct iucv_handler *handler, int smp)
804{
805 struct iucv_path *p, *n;
806
807 mutex_lock(&iucv_register_mutex);
808 spin_lock_bh(&iucv_table_lock);
809 /* Remove handler from the iucv_handler_list. */
810 list_del_init(&handler->list);
811 /* Sever all pathids still referring to the handler. */
812 list_for_each_entry_safe(p, n, &handler->paths, list) {
813 iucv_sever_pathid(p->pathid, NULL);
814 iucv_path_table[p->pathid] = NULL;
815 list_del(&p->list);
816 iucv_path_free(p);
817 }
818 spin_unlock_bh(&iucv_table_lock);
819 if (!smp)
820 iucv_nonsmp_handler--;
821 if (list_empty(&iucv_handler_list))
822 iucv_disable();
823 else if (!smp && iucv_nonsmp_handler == 0)
824 iucv_setmask_mp();
825 mutex_unlock(&iucv_register_mutex);
826}
827EXPORT_SYMBOL(iucv_unregister);
828
829static int iucv_reboot_event(struct notifier_block *this,
830 unsigned long event, void *ptr)
831{
832 int i;
833
834 get_online_cpus();
835 on_each_cpu(iucv_block_cpu, NULL, 1);
836 preempt_disable();
837 for (i = 0; i < iucv_max_pathid; i++) {
838 if (iucv_path_table[i])
839 iucv_sever_pathid(i, NULL);
840 }
841 preempt_enable();
842 put_online_cpus();
843 iucv_disable();
844 return NOTIFY_DONE;
845}
846
847static struct notifier_block iucv_reboot_notifier = {
848 .notifier_call = iucv_reboot_event,
849};
850
851/**
852 * iucv_path_accept
853 * @path: address of iucv path structure
854 * @handler: address of iucv handler structure
855 * @userdata: 16 bytes of data reflected to the communication partner
856 * @private: private data passed to interrupt handlers for this path
857 *
858 * This function is issued after the user received a connection pending
859 * external interrupt and now wishes to complete the IUCV communication path.
860 *
861 * Returns the result of the CP IUCV call.
862 */
863int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
864 u8 userdata[16], void *private)
865{
866 union iucv_param *parm;
867 int rc;
868
869 local_bh_disable();
870 if (cpumask_empty(&iucv_buffer_cpumask)) {
871 rc = -EIO;
872 goto out;
873 }
874 /* Prepare parameter block. */
875 parm = iucv_param[smp_processor_id()];
876 memset(parm, 0, sizeof(union iucv_param));
877 parm->ctrl.ippathid = path->pathid;
878 parm->ctrl.ipmsglim = path->msglim;
879 if (userdata)
880 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
881 parm->ctrl.ipflags1 = path->flags;
882
883 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
884 if (!rc) {
885 path->private = private;
886 path->msglim = parm->ctrl.ipmsglim;
887 path->flags = parm->ctrl.ipflags1;
888 }
889out:
890 local_bh_enable();
891 return rc;
892}
893EXPORT_SYMBOL(iucv_path_accept);
894
895/**
896 * iucv_path_connect
897 * @path: address of iucv path structure
898 * @handler: address of iucv handler structure
899 * @userid: 8-byte user identification
900 * @system: 8-byte target system identification
901 * @userdata: 16 bytes of data reflected to the communication partner
902 * @private: private data passed to interrupt handlers for this path
903 *
904 * This function establishes an IUCV path. Although the connect may complete
905 * successfully, you are not able to use the path until you receive an IUCV
906 * Connection Complete external interrupt.
907 *
908 * Returns the result of the CP IUCV call.
909 */
910int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
911 u8 userid[8], u8 system[8], u8 userdata[16],
912 void *private)
913{
914 union iucv_param *parm;
915 int rc;
916
917 spin_lock_bh(&iucv_table_lock);
918 iucv_cleanup_queue();
919 if (cpumask_empty(&iucv_buffer_cpumask)) {
920 rc = -EIO;
921 goto out;
922 }
923 parm = iucv_param[smp_processor_id()];
924 memset(parm, 0, sizeof(union iucv_param));
925 parm->ctrl.ipmsglim = path->msglim;
926 parm->ctrl.ipflags1 = path->flags;
927 if (userid) {
928 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
929 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
930 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
931 }
932 if (system) {
933 memcpy(parm->ctrl.iptarget, system,
934 sizeof(parm->ctrl.iptarget));
935 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
936 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
937 }
938 if (userdata)
939 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
940
941 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
942 if (!rc) {
943 if (parm->ctrl.ippathid < iucv_max_pathid) {
944 path->pathid = parm->ctrl.ippathid;
945 path->msglim = parm->ctrl.ipmsglim;
946 path->flags = parm->ctrl.ipflags1;
947 path->handler = handler;
948 path->private = private;
949 list_add_tail(&path->list, &handler->paths);
950 iucv_path_table[path->pathid] = path;
951 } else {
952 iucv_sever_pathid(parm->ctrl.ippathid,
953 iucv_error_pathid);
954 rc = -EIO;
955 }
956 }
957out:
958 spin_unlock_bh(&iucv_table_lock);
959 return rc;
960}
961EXPORT_SYMBOL(iucv_path_connect);
962
963/**
964 * iucv_path_quiesce:
965 * @path: address of iucv path structure
966 * @userdata: 16 bytes of data reflected to the communication partner
967 *
968 * This function temporarily suspends incoming messages on an IUCV path.
969 * You can later reactivate the path by invoking the iucv_resume function.
970 *
971 * Returns the result from the CP IUCV call.
972 */
973int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
974{
975 union iucv_param *parm;
976 int rc;
977
978 local_bh_disable();
979 if (cpumask_empty(&iucv_buffer_cpumask)) {
980 rc = -EIO;
981 goto out;
982 }
983 parm = iucv_param[smp_processor_id()];
984 memset(parm, 0, sizeof(union iucv_param));
985 if (userdata)
986 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
987 parm->ctrl.ippathid = path->pathid;
988 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
989out:
990 local_bh_enable();
991 return rc;
992}
993EXPORT_SYMBOL(iucv_path_quiesce);
994
995/**
996 * iucv_path_resume:
997 * @path: address of iucv path structure
998 * @userdata: 16 bytes of data reflected to the communication partner
999 *
1000 * This function resumes incoming messages on an IUCV path that has
1001 * been stopped with iucv_path_quiesce.
1002 *
1003 * Returns the result from the CP IUCV call.
1004 */
1005int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1006{
1007 union iucv_param *parm;
1008 int rc;
1009
1010 local_bh_disable();
1011 if (cpumask_empty(&iucv_buffer_cpumask)) {
1012 rc = -EIO;
1013 goto out;
1014 }
1015 parm = iucv_param[smp_processor_id()];
1016 memset(parm, 0, sizeof(union iucv_param));
1017 if (userdata)
1018 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1019 parm->ctrl.ippathid = path->pathid;
1020 rc = iucv_call_b2f0(IUCV_RESUME, parm);
1021out:
1022 local_bh_enable();
1023 return rc;
1024}
1025
1026/**
1027 * iucv_path_sever
1028 * @path: address of iucv path structure
1029 * @userdata: 16 bytes of data reflected to the communication partner
1030 *
1031 * This function terminates an IUCV path.
1032 *
1033 * Returns the result from the CP IUCV call.
1034 */
1035int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1036{
1037 int rc;
1038
1039 preempt_disable();
1040 if (cpumask_empty(&iucv_buffer_cpumask)) {
1041 rc = -EIO;
1042 goto out;
1043 }
1044 if (iucv_active_cpu != smp_processor_id())
1045 spin_lock_bh(&iucv_table_lock);
1046 rc = iucv_sever_pathid(path->pathid, userdata);
1047 iucv_path_table[path->pathid] = NULL;
1048 list_del_init(&path->list);
1049 if (iucv_active_cpu != smp_processor_id())
1050 spin_unlock_bh(&iucv_table_lock);
1051out:
1052 preempt_enable();
1053 return rc;
1054}
1055EXPORT_SYMBOL(iucv_path_sever);
1056
1057/**
1058 * iucv_message_purge
1059 * @path: address of iucv path structure
1060 * @msg: address of iucv msg structure
1061 * @srccls: source class of message
1062 *
1063 * Cancels a message you have sent.
1064 *
1065 * Returns the result from the CP IUCV call.
1066 */
1067int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1068 u32 srccls)
1069{
1070 union iucv_param *parm;
1071 int rc;
1072
1073 local_bh_disable();
1074 if (cpumask_empty(&iucv_buffer_cpumask)) {
1075 rc = -EIO;
1076 goto out;
1077 }
1078 parm = iucv_param[smp_processor_id()];
1079 memset(parm, 0, sizeof(union iucv_param));
1080 parm->purge.ippathid = path->pathid;
1081 parm->purge.ipmsgid = msg->id;
1082 parm->purge.ipsrccls = srccls;
1083 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1084 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1085 if (!rc) {
1086 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1087 msg->tag = parm->purge.ipmsgtag;
1088 }
1089out:
1090 local_bh_enable();
1091 return rc;
1092}
1093EXPORT_SYMBOL(iucv_message_purge);
1094
1095/**
1096 * iucv_message_receive_iprmdata
1097 * @path: address of iucv path structure
1098 * @msg: address of iucv msg structure
1099 * @flags: how the message is received (IUCV_IPBUFLST)
1100 * @buffer: address of data buffer or address of struct iucv_array
1101 * @size: length of data buffer
1102 * @residual:
1103 *
1104 * Internal function used by iucv_message_receive and __iucv_message_receive
1105 * to receive RMDATA data stored in struct iucv_message.
1106 */
1107static int iucv_message_receive_iprmdata(struct iucv_path *path,
1108 struct iucv_message *msg,
1109 u8 flags, void *buffer,
1110 size_t size, size_t *residual)
1111{
1112 struct iucv_array *array;
1113 u8 *rmmsg;
1114 size_t copy;
1115
1116 /*
1117 * Message is 8 bytes long and has been stored to the
1118 * message descriptor itself.
1119 */
1120 if (residual)
1121 *residual = abs(size - 8);
1122 rmmsg = msg->rmmsg;
1123 if (flags & IUCV_IPBUFLST) {
1124 /* Copy to struct iucv_array. */
1125 size = (size < 8) ? size : 8;
1126 for (array = buffer; size > 0; array++) {
1127 copy = min_t(size_t, size, array->length);
1128 memcpy((u8 *)(addr_t) array->address,
1129 rmmsg, copy);
1130 rmmsg += copy;
1131 size -= copy;
1132 }
1133 } else {
1134 /* Copy to direct buffer. */
1135 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1136 }
1137 return 0;
1138}
1139
1140/**
1141 * __iucv_message_receive
1142 * @path: address of iucv path structure
1143 * @msg: address of iucv msg structure
1144 * @flags: how the message is received (IUCV_IPBUFLST)
1145 * @buffer: address of data buffer or address of struct iucv_array
1146 * @size: length of data buffer
1147 * @residual:
1148 *
1149 * This function receives messages that are being sent to you over
1150 * established paths. This function will deal with RMDATA messages
1151 * embedded in struct iucv_message as well.
1152 *
1153 * Locking: no locking
1154 *
1155 * Returns the result from the CP IUCV call.
1156 */
1157int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1158 u8 flags, void *buffer, size_t size, size_t *residual)
1159{
1160 union iucv_param *parm;
1161 int rc;
1162
1163 if (msg->flags & IUCV_IPRMDATA)
1164 return iucv_message_receive_iprmdata(path, msg, flags,
1165 buffer, size, residual);
1166 if (cpumask_empty(&iucv_buffer_cpumask)) {
1167 rc = -EIO;
1168 goto out;
1169 }
1170 parm = iucv_param[smp_processor_id()];
1171 memset(parm, 0, sizeof(union iucv_param));
1172 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1173 parm->db.ipbfln1f = (u32) size;
1174 parm->db.ipmsgid = msg->id;
1175 parm->db.ippathid = path->pathid;
1176 parm->db.iptrgcls = msg->class;
1177 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1178 IUCV_IPFGMID | IUCV_IPTRGCLS);
1179 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1180 if (!rc || rc == 5) {
1181 msg->flags = parm->db.ipflags1;
1182 if (residual)
1183 *residual = parm->db.ipbfln1f;
1184 }
1185out:
1186 return rc;
1187}
1188EXPORT_SYMBOL(__iucv_message_receive);
1189
1190/**
1191 * iucv_message_receive
1192 * @path: address of iucv path structure
1193 * @msg: address of iucv msg structure
1194 * @flags: how the message is received (IUCV_IPBUFLST)
1195 * @buffer: address of data buffer or address of struct iucv_array
1196 * @size: length of data buffer
1197 * @residual:
1198 *
1199 * This function receives messages that are being sent to you over
1200 * established paths. This function will deal with RMDATA messages
1201 * embedded in struct iucv_message as well.
1202 *
1203 * Locking: local_bh_enable/local_bh_disable
1204 *
1205 * Returns the result from the CP IUCV call.
1206 */
1207int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1208 u8 flags, void *buffer, size_t size, size_t *residual)
1209{
1210 int rc;
1211
1212 if (msg->flags & IUCV_IPRMDATA)
1213 return iucv_message_receive_iprmdata(path, msg, flags,
1214 buffer, size, residual);
1215 local_bh_disable();
1216 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1217 local_bh_enable();
1218 return rc;
1219}
1220EXPORT_SYMBOL(iucv_message_receive);
1221
1222/**
1223 * iucv_message_reject
1224 * @path: address of iucv path structure
1225 * @msg: address of iucv msg structure
1226 *
1227 * The reject function refuses a specified message. Between the time you
1228 * are notified of a message and the time that you complete the message,
1229 * the message may be rejected.
1230 *
1231 * Returns the result from the CP IUCV call.
1232 */
1233int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1234{
1235 union iucv_param *parm;
1236 int rc;
1237
1238 local_bh_disable();
1239 if (cpumask_empty(&iucv_buffer_cpumask)) {
1240 rc = -EIO;
1241 goto out;
1242 }
1243 parm = iucv_param[smp_processor_id()];
1244 memset(parm, 0, sizeof(union iucv_param));
1245 parm->db.ippathid = path->pathid;
1246 parm->db.ipmsgid = msg->id;
1247 parm->db.iptrgcls = msg->class;
1248 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1249 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1250out:
1251 local_bh_enable();
1252 return rc;
1253}
1254EXPORT_SYMBOL(iucv_message_reject);
1255
1256/**
1257 * iucv_message_reply
1258 * @path: address of iucv path structure
1259 * @msg: address of iucv msg structure
1260 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1261 * @reply: address of reply data buffer or address of struct iucv_array
1262 * @size: length of reply data buffer
1263 *
1264 * This function responds to the two-way messages that you receive. You
1265 * must identify completely the message to which you wish to reply. ie,
1266 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1267 * the parameter list.
1268 *
1269 * Returns the result from the CP IUCV call.
1270 */
1271int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1272 u8 flags, void *reply, size_t size)
1273{
1274 union iucv_param *parm;
1275 int rc;
1276
1277 local_bh_disable();
1278 if (cpumask_empty(&iucv_buffer_cpumask)) {
1279 rc = -EIO;
1280 goto out;
1281 }
1282 parm = iucv_param[smp_processor_id()];
1283 memset(parm, 0, sizeof(union iucv_param));
1284 if (flags & IUCV_IPRMDATA) {
1285 parm->dpl.ippathid = path->pathid;
1286 parm->dpl.ipflags1 = flags;
1287 parm->dpl.ipmsgid = msg->id;
1288 parm->dpl.iptrgcls = msg->class;
1289 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1290 } else {
1291 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1292 parm->db.ipbfln1f = (u32) size;
1293 parm->db.ippathid = path->pathid;
1294 parm->db.ipflags1 = flags;
1295 parm->db.ipmsgid = msg->id;
1296 parm->db.iptrgcls = msg->class;
1297 }
1298 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1299out:
1300 local_bh_enable();
1301 return rc;
1302}
1303EXPORT_SYMBOL(iucv_message_reply);
1304
1305/**
1306 * __iucv_message_send
1307 * @path: address of iucv path structure
1308 * @msg: address of iucv msg structure
1309 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1310 * @srccls: source class of message
1311 * @buffer: address of send buffer or address of struct iucv_array
1312 * @size: length of send buffer
1313 *
1314 * This function transmits data to another application. Data to be
1315 * transmitted is in a buffer and this is a one-way message and the
1316 * receiver will not reply to the message.
1317 *
1318 * Locking: no locking
1319 *
1320 * Returns the result from the CP IUCV call.
1321 */
1322int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1323 u8 flags, u32 srccls, void *buffer, size_t size)
1324{
1325 union iucv_param *parm;
1326 int rc;
1327
1328 if (cpumask_empty(&iucv_buffer_cpumask)) {
1329 rc = -EIO;
1330 goto out;
1331 }
1332 parm = iucv_param[smp_processor_id()];
1333 memset(parm, 0, sizeof(union iucv_param));
1334 if (flags & IUCV_IPRMDATA) {
1335 /* Message of 8 bytes can be placed into the parameter list. */
1336 parm->dpl.ippathid = path->pathid;
1337 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1338 parm->dpl.iptrgcls = msg->class;
1339 parm->dpl.ipsrccls = srccls;
1340 parm->dpl.ipmsgtag = msg->tag;
1341 memcpy(parm->dpl.iprmmsg, buffer, 8);
1342 } else {
1343 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1344 parm->db.ipbfln1f = (u32) size;
1345 parm->db.ippathid = path->pathid;
1346 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1347 parm->db.iptrgcls = msg->class;
1348 parm->db.ipsrccls = srccls;
1349 parm->db.ipmsgtag = msg->tag;
1350 }
1351 rc = iucv_call_b2f0(IUCV_SEND, parm);
1352 if (!rc)
1353 msg->id = parm->db.ipmsgid;
1354out:
1355 return rc;
1356}
1357EXPORT_SYMBOL(__iucv_message_send);
1358
1359/**
1360 * iucv_message_send
1361 * @path: address of iucv path structure
1362 * @msg: address of iucv msg structure
1363 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1364 * @srccls: source class of message
1365 * @buffer: address of send buffer or address of struct iucv_array
1366 * @size: length of send buffer
1367 *
1368 * This function transmits data to another application. Data to be
1369 * transmitted is in a buffer and this is a one-way message and the
1370 * receiver will not reply to the message.
1371 *
1372 * Locking: local_bh_enable/local_bh_disable
1373 *
1374 * Returns the result from the CP IUCV call.
1375 */
1376int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1377 u8 flags, u32 srccls, void *buffer, size_t size)
1378{
1379 int rc;
1380
1381 local_bh_disable();
1382 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1383 local_bh_enable();
1384 return rc;
1385}
1386EXPORT_SYMBOL(iucv_message_send);
1387
1388/**
1389 * iucv_message_send2way
1390 * @path: address of iucv path structure
1391 * @msg: address of iucv msg structure
1392 * @flags: how the message is sent and the reply is received
1393 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1394 * @srccls: source class of message
1395 * @buffer: address of send buffer or address of struct iucv_array
1396 * @size: length of send buffer
1397 * @ansbuf: address of answer buffer or address of struct iucv_array
1398 * @asize: size of reply buffer
1399 *
1400 * This function transmits data to another application. Data to be
1401 * transmitted is in a buffer. The receiver of the send is expected to
1402 * reply to the message and a buffer is provided into which IUCV moves
1403 * the reply to this message.
1404 *
1405 * Returns the result from the CP IUCV call.
1406 */
1407int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1408 u8 flags, u32 srccls, void *buffer, size_t size,
1409 void *answer, size_t asize, size_t *residual)
1410{
1411 union iucv_param *parm;
1412 int rc;
1413
1414 local_bh_disable();
1415 if (cpumask_empty(&iucv_buffer_cpumask)) {
1416 rc = -EIO;
1417 goto out;
1418 }
1419 parm = iucv_param[smp_processor_id()];
1420 memset(parm, 0, sizeof(union iucv_param));
1421 if (flags & IUCV_IPRMDATA) {
1422 parm->dpl.ippathid = path->pathid;
1423 parm->dpl.ipflags1 = path->flags; /* priority message */
1424 parm->dpl.iptrgcls = msg->class;
1425 parm->dpl.ipsrccls = srccls;
1426 parm->dpl.ipmsgtag = msg->tag;
1427 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1428 parm->dpl.ipbfln2f = (u32) asize;
1429 memcpy(parm->dpl.iprmmsg, buffer, 8);
1430 } else {
1431 parm->db.ippathid = path->pathid;
1432 parm->db.ipflags1 = path->flags; /* priority message */
1433 parm->db.iptrgcls = msg->class;
1434 parm->db.ipsrccls = srccls;
1435 parm->db.ipmsgtag = msg->tag;
1436 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1437 parm->db.ipbfln1f = (u32) size;
1438 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1439 parm->db.ipbfln2f = (u32) asize;
1440 }
1441 rc = iucv_call_b2f0(IUCV_SEND, parm);
1442 if (!rc)
1443 msg->id = parm->db.ipmsgid;
1444out:
1445 local_bh_enable();
1446 return rc;
1447}
1448EXPORT_SYMBOL(iucv_message_send2way);
1449
1450/**
1451 * iucv_path_pending
1452 * @data: Pointer to external interrupt buffer
1453 *
1454 * Process connection pending work item. Called from tasklet while holding
1455 * iucv_table_lock.
1456 */
1457struct iucv_path_pending {
1458 u16 ippathid;
1459 u8 ipflags1;
1460 u8 iptype;
1461 u16 ipmsglim;
1462 u16 res1;
1463 u8 ipvmid[8];
1464 u8 ipuser[16];
1465 u32 res3;
1466 u8 ippollfg;
1467 u8 res4[3];
1468} __packed;
1469
1470static void iucv_path_pending(struct iucv_irq_data *data)
1471{
1472 struct iucv_path_pending *ipp = (void *) data;
1473 struct iucv_handler *handler;
1474 struct iucv_path *path;
1475 char *error;
1476
1477 BUG_ON(iucv_path_table[ipp->ippathid]);
1478 /* New pathid, handler found. Create a new path struct. */
1479 error = iucv_error_no_memory;
1480 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1481 if (!path)
1482 goto out_sever;
1483 path->pathid = ipp->ippathid;
1484 iucv_path_table[path->pathid] = path;
1485 EBCASC(ipp->ipvmid, 8);
1486
1487 /* Call registered handler until one is found that wants the path. */
1488 list_for_each_entry(handler, &iucv_handler_list, list) {
1489 if (!handler->path_pending)
1490 continue;
1491 /*
1492 * Add path to handler to allow a call to iucv_path_sever
1493 * inside the path_pending function. If the handler returns
1494 * an error remove the path from the handler again.
1495 */
1496 list_add(&path->list, &handler->paths);
1497 path->handler = handler;
1498 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1499 return;
1500 list_del(&path->list);
1501 path->handler = NULL;
1502 }
1503 /* No handler wanted the path. */
1504 iucv_path_table[path->pathid] = NULL;
1505 iucv_path_free(path);
1506 error = iucv_error_no_listener;
1507out_sever:
1508 iucv_sever_pathid(ipp->ippathid, error);
1509}
1510
1511/**
1512 * iucv_path_complete
1513 * @data: Pointer to external interrupt buffer
1514 *
1515 * Process connection complete work item. Called from tasklet while holding
1516 * iucv_table_lock.
1517 */
1518struct iucv_path_complete {
1519 u16 ippathid;
1520 u8 ipflags1;
1521 u8 iptype;
1522 u16 ipmsglim;
1523 u16 res1;
1524 u8 res2[8];
1525 u8 ipuser[16];
1526 u32 res3;
1527 u8 ippollfg;
1528 u8 res4[3];
1529} __packed;
1530
1531static void iucv_path_complete(struct iucv_irq_data *data)
1532{
1533 struct iucv_path_complete *ipc = (void *) data;
1534 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1535
1536 if (path)
1537 path->flags = ipc->ipflags1;
1538 if (path && path->handler && path->handler->path_complete)
1539 path->handler->path_complete(path, ipc->ipuser);
1540}
1541
1542/**
1543 * iucv_path_severed
1544 * @data: Pointer to external interrupt buffer
1545 *
1546 * Process connection severed work item. Called from tasklet while holding
1547 * iucv_table_lock.
1548 */
1549struct iucv_path_severed {
1550 u16 ippathid;
1551 u8 res1;
1552 u8 iptype;
1553 u32 res2;
1554 u8 res3[8];
1555 u8 ipuser[16];
1556 u32 res4;
1557 u8 ippollfg;
1558 u8 res5[3];
1559} __packed;
1560
1561static void iucv_path_severed(struct iucv_irq_data *data)
1562{
1563 struct iucv_path_severed *ips = (void *) data;
1564 struct iucv_path *path = iucv_path_table[ips->ippathid];
1565
1566 if (!path || !path->handler) /* Already severed */
1567 return;
1568 if (path->handler->path_severed)
1569 path->handler->path_severed(path, ips->ipuser);
1570 else {
1571 iucv_sever_pathid(path->pathid, NULL);
1572 iucv_path_table[path->pathid] = NULL;
1573 list_del(&path->list);
1574 iucv_path_free(path);
1575 }
1576}
1577
1578/**
1579 * iucv_path_quiesced
1580 * @data: Pointer to external interrupt buffer
1581 *
1582 * Process connection quiesced work item. Called from tasklet while holding
1583 * iucv_table_lock.
1584 */
1585struct iucv_path_quiesced {
1586 u16 ippathid;
1587 u8 res1;
1588 u8 iptype;
1589 u32 res2;
1590 u8 res3[8];
1591 u8 ipuser[16];
1592 u32 res4;
1593 u8 ippollfg;
1594 u8 res5[3];
1595} __packed;
1596
1597static void iucv_path_quiesced(struct iucv_irq_data *data)
1598{
1599 struct iucv_path_quiesced *ipq = (void *) data;
1600 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1601
1602 if (path && path->handler && path->handler->path_quiesced)
1603 path->handler->path_quiesced(path, ipq->ipuser);
1604}
1605
1606/**
1607 * iucv_path_resumed
1608 * @data: Pointer to external interrupt buffer
1609 *
1610 * Process connection resumed work item. Called from tasklet while holding
1611 * iucv_table_lock.
1612 */
1613struct iucv_path_resumed {
1614 u16 ippathid;
1615 u8 res1;
1616 u8 iptype;
1617 u32 res2;
1618 u8 res3[8];
1619 u8 ipuser[16];
1620 u32 res4;
1621 u8 ippollfg;
1622 u8 res5[3];
1623} __packed;
1624
1625static void iucv_path_resumed(struct iucv_irq_data *data)
1626{
1627 struct iucv_path_resumed *ipr = (void *) data;
1628 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1629
1630 if (path && path->handler && path->handler->path_resumed)
1631 path->handler->path_resumed(path, ipr->ipuser);
1632}
1633
1634/**
1635 * iucv_message_complete
1636 * @data: Pointer to external interrupt buffer
1637 *
1638 * Process message complete work item. Called from tasklet while holding
1639 * iucv_table_lock.
1640 */
1641struct iucv_message_complete {
1642 u16 ippathid;
1643 u8 ipflags1;
1644 u8 iptype;
1645 u32 ipmsgid;
1646 u32 ipaudit;
1647 u8 iprmmsg[8];
1648 u32 ipsrccls;
1649 u32 ipmsgtag;
1650 u32 res;
1651 u32 ipbfln2f;
1652 u8 ippollfg;
1653 u8 res2[3];
1654} __packed;
1655
1656static void iucv_message_complete(struct iucv_irq_data *data)
1657{
1658 struct iucv_message_complete *imc = (void *) data;
1659 struct iucv_path *path = iucv_path_table[imc->ippathid];
1660 struct iucv_message msg;
1661
1662 if (path && path->handler && path->handler->message_complete) {
1663 msg.flags = imc->ipflags1;
1664 msg.id = imc->ipmsgid;
1665 msg.audit = imc->ipaudit;
1666 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1667 msg.class = imc->ipsrccls;
1668 msg.tag = imc->ipmsgtag;
1669 msg.length = imc->ipbfln2f;
1670 path->handler->message_complete(path, &msg);
1671 }
1672}
1673
1674/**
1675 * iucv_message_pending
1676 * @data: Pointer to external interrupt buffer
1677 *
1678 * Process message pending work item. Called from tasklet while holding
1679 * iucv_table_lock.
1680 */
1681struct iucv_message_pending {
1682 u16 ippathid;
1683 u8 ipflags1;
1684 u8 iptype;
1685 u32 ipmsgid;
1686 u32 iptrgcls;
1687 union {
1688 u32 iprmmsg1_u32;
1689 u8 iprmmsg1[4];
1690 } ln1msg1;
1691 union {
1692 u32 ipbfln1f;
1693 u8 iprmmsg2[4];
1694 } ln1msg2;
1695 u32 res1[3];
1696 u32 ipbfln2f;
1697 u8 ippollfg;
1698 u8 res2[3];
1699} __packed;
1700
1701static void iucv_message_pending(struct iucv_irq_data *data)
1702{
1703 struct iucv_message_pending *imp = (void *) data;
1704 struct iucv_path *path = iucv_path_table[imp->ippathid];
1705 struct iucv_message msg;
1706
1707 if (path && path->handler && path->handler->message_pending) {
1708 msg.flags = imp->ipflags1;
1709 msg.id = imp->ipmsgid;
1710 msg.class = imp->iptrgcls;
1711 if (imp->ipflags1 & IUCV_IPRMDATA) {
1712 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1713 msg.length = 8;
1714 } else
1715 msg.length = imp->ln1msg2.ipbfln1f;
1716 msg.reply_size = imp->ipbfln2f;
1717 path->handler->message_pending(path, &msg);
1718 }
1719}
1720
1721/**
1722 * iucv_tasklet_fn:
1723 *
1724 * This tasklet loops over the queue of irq buffers created by
1725 * iucv_external_interrupt, calls the appropriate action handler
1726 * and then frees the buffer.
1727 */
1728static void iucv_tasklet_fn(unsigned long ignored)
1729{
1730 typedef void iucv_irq_fn(struct iucv_irq_data *);
1731 static iucv_irq_fn *irq_fn[] = {
1732 [0x02] = iucv_path_complete,
1733 [0x03] = iucv_path_severed,
1734 [0x04] = iucv_path_quiesced,
1735 [0x05] = iucv_path_resumed,
1736 [0x06] = iucv_message_complete,
1737 [0x07] = iucv_message_complete,
1738 [0x08] = iucv_message_pending,
1739 [0x09] = iucv_message_pending,
1740 };
1741 LIST_HEAD(task_queue);
1742 struct iucv_irq_list *p, *n;
1743
1744 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1745 if (!spin_trylock(&iucv_table_lock)) {
1746 tasklet_schedule(&iucv_tasklet);
1747 return;
1748 }
1749 iucv_active_cpu = smp_processor_id();
1750
1751 spin_lock_irq(&iucv_queue_lock);
1752 list_splice_init(&iucv_task_queue, &task_queue);
1753 spin_unlock_irq(&iucv_queue_lock);
1754
1755 list_for_each_entry_safe(p, n, &task_queue, list) {
1756 list_del_init(&p->list);
1757 irq_fn[p->data.iptype](&p->data);
1758 kfree(p);
1759 }
1760
1761 iucv_active_cpu = -1;
1762 spin_unlock(&iucv_table_lock);
1763}
1764
1765/**
1766 * iucv_work_fn:
1767 *
1768 * This work function loops over the queue of path pending irq blocks
1769 * created by iucv_external_interrupt, calls the appropriate action
1770 * handler and then frees the buffer.
1771 */
1772static void iucv_work_fn(struct work_struct *work)
1773{
1774 LIST_HEAD(work_queue);
1775 struct iucv_irq_list *p, *n;
1776
1777 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1778 spin_lock_bh(&iucv_table_lock);
1779 iucv_active_cpu = smp_processor_id();
1780
1781 spin_lock_irq(&iucv_queue_lock);
1782 list_splice_init(&iucv_work_queue, &work_queue);
1783 spin_unlock_irq(&iucv_queue_lock);
1784
1785 iucv_cleanup_queue();
1786 list_for_each_entry_safe(p, n, &work_queue, list) {
1787 list_del_init(&p->list);
1788 iucv_path_pending(&p->data);
1789 kfree(p);
1790 }
1791
1792 iucv_active_cpu = -1;
1793 spin_unlock_bh(&iucv_table_lock);
1794}
1795
1796/**
1797 * iucv_external_interrupt
1798 * @code: irq code
1799 *
1800 * Handles external interrupts coming in from CP.
1801 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1802 */
1803static void iucv_external_interrupt(struct ext_code ext_code,
1804 unsigned int param32, unsigned long param64)
1805{
1806 struct iucv_irq_data *p;
1807 struct iucv_irq_list *work;
1808
1809 kstat_cpu(smp_processor_id()).irqs[EXTINT_IUC]++;
1810 p = iucv_irq_data[smp_processor_id()];
1811 if (p->ippathid >= iucv_max_pathid) {
1812 WARN_ON(p->ippathid >= iucv_max_pathid);
1813 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1814 return;
1815 }
1816 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1817 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1818 if (!work) {
1819 pr_warning("iucv_external_interrupt: out of memory\n");
1820 return;
1821 }
1822 memcpy(&work->data, p, sizeof(work->data));
1823 spin_lock(&iucv_queue_lock);
1824 if (p->iptype == 0x01) {
1825 /* Path pending interrupt. */
1826 list_add_tail(&work->list, &iucv_work_queue);
1827 schedule_work(&iucv_work);
1828 } else {
1829 /* The other interrupts. */
1830 list_add_tail(&work->list, &iucv_task_queue);
1831 tasklet_schedule(&iucv_tasklet);
1832 }
1833 spin_unlock(&iucv_queue_lock);
1834}
1835
1836static int iucv_pm_prepare(struct device *dev)
1837{
1838 int rc = 0;
1839
1840#ifdef CONFIG_PM_DEBUG
1841 printk(KERN_INFO "iucv_pm_prepare\n");
1842#endif
1843 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1844 rc = dev->driver->pm->prepare(dev);
1845 return rc;
1846}
1847
1848static void iucv_pm_complete(struct device *dev)
1849{
1850#ifdef CONFIG_PM_DEBUG
1851 printk(KERN_INFO "iucv_pm_complete\n");
1852#endif
1853 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1854 dev->driver->pm->complete(dev);
1855}
1856
1857/**
1858 * iucv_path_table_empty() - determine if iucv path table is empty
1859 *
1860 * Returns 0 if there are still iucv pathes defined
1861 * 1 if there are no iucv pathes defined
1862 */
1863int iucv_path_table_empty(void)
1864{
1865 int i;
1866
1867 for (i = 0; i < iucv_max_pathid; i++) {
1868 if (iucv_path_table[i])
1869 return 0;
1870 }
1871 return 1;
1872}
1873
1874/**
1875 * iucv_pm_freeze() - Freeze PM callback
1876 * @dev: iucv-based device
1877 *
1878 * disable iucv interrupts
1879 * invoke callback function of the iucv-based driver
1880 * shut down iucv, if no iucv-pathes are established anymore
1881 */
1882static int iucv_pm_freeze(struct device *dev)
1883{
1884 int cpu;
1885 struct iucv_irq_list *p, *n;
1886 int rc = 0;
1887
1888#ifdef CONFIG_PM_DEBUG
1889 printk(KERN_WARNING "iucv_pm_freeze\n");
1890#endif
1891 if (iucv_pm_state != IUCV_PM_FREEZING) {
1892 for_each_cpu(cpu, &iucv_irq_cpumask)
1893 smp_call_function_single(cpu, iucv_block_cpu_almost,
1894 NULL, 1);
1895 cancel_work_sync(&iucv_work);
1896 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1897 list_del_init(&p->list);
1898 iucv_sever_pathid(p->data.ippathid,
1899 iucv_error_no_listener);
1900 kfree(p);
1901 }
1902 }
1903 iucv_pm_state = IUCV_PM_FREEZING;
1904 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1905 rc = dev->driver->pm->freeze(dev);
1906 if (iucv_path_table_empty())
1907 iucv_disable();
1908 return rc;
1909}
1910
1911/**
1912 * iucv_pm_thaw() - Thaw PM callback
1913 * @dev: iucv-based device
1914 *
1915 * make iucv ready for use again: allocate path table, declare interrupt buffers
1916 * and enable iucv interrupts
1917 * invoke callback function of the iucv-based driver
1918 */
1919static int iucv_pm_thaw(struct device *dev)
1920{
1921 int rc = 0;
1922
1923#ifdef CONFIG_PM_DEBUG
1924 printk(KERN_WARNING "iucv_pm_thaw\n");
1925#endif
1926 iucv_pm_state = IUCV_PM_THAWING;
1927 if (!iucv_path_table) {
1928 rc = iucv_enable();
1929 if (rc)
1930 goto out;
1931 }
1932 if (cpumask_empty(&iucv_irq_cpumask)) {
1933 if (iucv_nonsmp_handler)
1934 /* enable interrupts on one cpu */
1935 iucv_allow_cpu(NULL);
1936 else
1937 /* enable interrupts on all cpus */
1938 iucv_setmask_mp();
1939 }
1940 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1941 rc = dev->driver->pm->thaw(dev);
1942out:
1943 return rc;
1944}
1945
1946/**
1947 * iucv_pm_restore() - Restore PM callback
1948 * @dev: iucv-based device
1949 *
1950 * make iucv ready for use again: allocate path table, declare interrupt buffers
1951 * and enable iucv interrupts
1952 * invoke callback function of the iucv-based driver
1953 */
1954static int iucv_pm_restore(struct device *dev)
1955{
1956 int rc = 0;
1957
1958#ifdef CONFIG_PM_DEBUG
1959 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1960#endif
1961 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1962 pr_warning("Suspending Linux did not completely close all IUCV "
1963 "connections\n");
1964 iucv_pm_state = IUCV_PM_RESTORING;
1965 if (cpumask_empty(&iucv_irq_cpumask)) {
1966 rc = iucv_query_maxconn();
1967 rc = iucv_enable();
1968 if (rc)
1969 goto out;
1970 }
1971 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1972 rc = dev->driver->pm->restore(dev);
1973out:
1974 return rc;
1975}
1976
1977struct iucv_interface iucv_if = {
1978 .message_receive = iucv_message_receive,
1979 .__message_receive = __iucv_message_receive,
1980 .message_reply = iucv_message_reply,
1981 .message_reject = iucv_message_reject,
1982 .message_send = iucv_message_send,
1983 .__message_send = __iucv_message_send,
1984 .message_send2way = iucv_message_send2way,
1985 .message_purge = iucv_message_purge,
1986 .path_accept = iucv_path_accept,
1987 .path_connect = iucv_path_connect,
1988 .path_quiesce = iucv_path_quiesce,
1989 .path_resume = iucv_path_resume,
1990 .path_sever = iucv_path_sever,
1991 .iucv_register = iucv_register,
1992 .iucv_unregister = iucv_unregister,
1993 .bus = NULL,
1994 .root = NULL,
1995};
1996EXPORT_SYMBOL(iucv_if);
1997
1998/**
1999 * iucv_init
2000 *
2001 * Allocates and initializes various data structures.
2002 */
2003static int __init iucv_init(void)
2004{
2005 int rc;
2006 int cpu;
2007
2008 if (!MACHINE_IS_VM) {
2009 rc = -EPROTONOSUPPORT;
2010 goto out;
2011 }
2012 ctl_set_bit(0, 1);
2013 rc = iucv_query_maxconn();
2014 if (rc)
2015 goto out_ctl;
2016 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
2017 if (rc)
2018 goto out_ctl;
2019 iucv_root = root_device_register("iucv");
2020 if (IS_ERR(iucv_root)) {
2021 rc = PTR_ERR(iucv_root);
2022 goto out_int;
2023 }
2024
2025 for_each_online_cpu(cpu) {
2026 /* Note: GFP_DMA used to get memory below 2G */
2027 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
2028 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2029 if (!iucv_irq_data[cpu]) {
2030 rc = -ENOMEM;
2031 goto out_free;
2032 }
2033
2034 /* Allocate parameter blocks. */
2035 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
2036 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2037 if (!iucv_param[cpu]) {
2038 rc = -ENOMEM;
2039 goto out_free;
2040 }
2041 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
2042 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2043 if (!iucv_param_irq[cpu]) {
2044 rc = -ENOMEM;
2045 goto out_free;
2046 }
2047
2048 }
2049 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
2050 if (rc)
2051 goto out_free;
2052 rc = register_reboot_notifier(&iucv_reboot_notifier);
2053 if (rc)
2054 goto out_cpu;
2055 ASCEBC(iucv_error_no_listener, 16);
2056 ASCEBC(iucv_error_no_memory, 16);
2057 ASCEBC(iucv_error_pathid, 16);
2058 iucv_available = 1;
2059 rc = bus_register(&iucv_bus);
2060 if (rc)
2061 goto out_reboot;
2062 iucv_if.root = iucv_root;
2063 iucv_if.bus = &iucv_bus;
2064 return 0;
2065
2066out_reboot:
2067 unregister_reboot_notifier(&iucv_reboot_notifier);
2068out_cpu:
2069 unregister_hotcpu_notifier(&iucv_cpu_notifier);
2070out_free:
2071 for_each_possible_cpu(cpu) {
2072 kfree(iucv_param_irq[cpu]);
2073 iucv_param_irq[cpu] = NULL;
2074 kfree(iucv_param[cpu]);
2075 iucv_param[cpu] = NULL;
2076 kfree(iucv_irq_data[cpu]);
2077 iucv_irq_data[cpu] = NULL;
2078 }
2079 root_device_unregister(iucv_root);
2080out_int:
2081 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2082out_ctl:
2083 ctl_clear_bit(0, 1);
2084out:
2085 return rc;
2086}
2087
2088/**
2089 * iucv_exit
2090 *
2091 * Frees everything allocated from iucv_init.
2092 */
2093static void __exit iucv_exit(void)
2094{
2095 struct iucv_irq_list *p, *n;
2096 int cpu;
2097
2098 spin_lock_irq(&iucv_queue_lock);
2099 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2100 kfree(p);
2101 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2102 kfree(p);
2103 spin_unlock_irq(&iucv_queue_lock);
2104 unregister_reboot_notifier(&iucv_reboot_notifier);
2105 unregister_hotcpu_notifier(&iucv_cpu_notifier);
2106 for_each_possible_cpu(cpu) {
2107 kfree(iucv_param_irq[cpu]);
2108 iucv_param_irq[cpu] = NULL;
2109 kfree(iucv_param[cpu]);
2110 iucv_param[cpu] = NULL;
2111 kfree(iucv_irq_data[cpu]);
2112 iucv_irq_data[cpu] = NULL;
2113 }
2114 root_device_unregister(iucv_root);
2115 bus_unregister(&iucv_bus);
2116 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2117}
2118
2119subsys_initcall(iucv_init);
2120module_exit(iucv_exit);
2121
2122MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2123MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2124MODULE_LICENSE("GPL");