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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
70const struct 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[9];
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: array of pointers to 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 dma32_t 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 dma32_t ipbfadr1;
230 u32 ipbfln1f;
231 u32 ipsrccls;
232 u32 ipmsgtag;
233 dma32_t 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 * @command: 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 unsigned long reg1 = virt_to_phys(parm);
290 int cc;
291
292 asm volatile(
293 " lgr 0,%[reg0]\n"
294 " lgr 1,%[reg1]\n"
295 " .long 0xb2f01000\n"
296 " ipm %[cc]\n"
297 " srl %[cc],28\n"
298 : [cc] "=&d" (cc), "+m" (*parm)
299 : [reg0] "d" ((unsigned long)command),
300 [reg1] "d" (reg1)
301 : "cc", "0", "1");
302 return cc;
303}
304
305static inline int iucv_call_b2f0(int command, union iucv_param *parm)
306{
307 int ccode;
308
309 ccode = __iucv_call_b2f0(command, parm);
310 return ccode == 1 ? parm->ctrl.iprcode : ccode;
311}
312
313/*
314 * iucv_query_maxconn
315 *
316 * Determines the maximum number of connections that may be established.
317 *
318 * Returns the maximum number of connections or -EPERM is IUCV is not
319 * available.
320 */
321static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
322{
323 unsigned long reg1 = virt_to_phys(param);
324 int cc;
325
326 asm volatile (
327 " lghi 0,%[cmd]\n"
328 " lgr 1,%[reg1]\n"
329 " .long 0xb2f01000\n"
330 " ipm %[cc]\n"
331 " srl %[cc],28\n"
332 " lgr %[reg1],1\n"
333 : [cc] "=&d" (cc), [reg1] "+&d" (reg1)
334 : [cmd] "K" (IUCV_QUERY)
335 : "cc", "0", "1");
336 *max_pathid = reg1;
337 return cc;
338}
339
340static int iucv_query_maxconn(void)
341{
342 unsigned long max_pathid;
343 void *param;
344 int ccode;
345
346 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
347 if (!param)
348 return -ENOMEM;
349 ccode = __iucv_query_maxconn(param, &max_pathid);
350 if (ccode == 0)
351 iucv_max_pathid = max_pathid;
352 kfree(param);
353 return ccode ? -EPERM : 0;
354}
355
356/**
357 * iucv_allow_cpu
358 * @data: unused
359 *
360 * Allow iucv interrupts on this cpu.
361 */
362static void iucv_allow_cpu(void *data)
363{
364 int cpu = smp_processor_id();
365 union iucv_param *parm;
366
367 /*
368 * Enable all iucv interrupts.
369 * ipmask contains bits for the different interrupts
370 * 0x80 - Flag to allow nonpriority message pending interrupts
371 * 0x40 - Flag to allow priority message pending interrupts
372 * 0x20 - Flag to allow nonpriority message completion interrupts
373 * 0x10 - Flag to allow priority message completion interrupts
374 * 0x08 - Flag to allow IUCV control interrupts
375 */
376 parm = iucv_param_irq[cpu];
377 memset(parm, 0, sizeof(union iucv_param));
378 parm->set_mask.ipmask = 0xf8;
379 iucv_call_b2f0(IUCV_SETMASK, parm);
380
381 /*
382 * Enable all iucv control interrupts.
383 * ipmask contains bits for the different interrupts
384 * 0x80 - Flag to allow pending connections interrupts
385 * 0x40 - Flag to allow connection complete interrupts
386 * 0x20 - Flag to allow connection severed interrupts
387 * 0x10 - Flag to allow connection quiesced interrupts
388 * 0x08 - Flag to allow connection resumed interrupts
389 */
390 memset(parm, 0, sizeof(union iucv_param));
391 parm->set_mask.ipmask = 0xf8;
392 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
393 /* Set indication that iucv interrupts are allowed for this cpu. */
394 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
395}
396
397/**
398 * iucv_block_cpu
399 * @data: unused
400 *
401 * Block iucv interrupts on this cpu.
402 */
403static void iucv_block_cpu(void *data)
404{
405 int cpu = smp_processor_id();
406 union iucv_param *parm;
407
408 /* Disable all iucv interrupts. */
409 parm = iucv_param_irq[cpu];
410 memset(parm, 0, sizeof(union iucv_param));
411 iucv_call_b2f0(IUCV_SETMASK, parm);
412
413 /* Clear indication that iucv interrupts are allowed for this cpu. */
414 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
415}
416
417/**
418 * iucv_declare_cpu
419 * @data: unused
420 *
421 * Declare a interrupt buffer on this cpu.
422 */
423static void iucv_declare_cpu(void *data)
424{
425 int cpu = smp_processor_id();
426 union iucv_param *parm;
427 int rc;
428
429 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
430 return;
431
432 /* Declare interrupt buffer. */
433 parm = iucv_param_irq[cpu];
434 memset(parm, 0, sizeof(union iucv_param));
435 parm->db.ipbfadr1 = virt_to_dma32(iucv_irq_data[cpu]);
436 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
437 if (rc) {
438 char *err = "Unknown";
439 switch (rc) {
440 case 0x03:
441 err = "Directory error";
442 break;
443 case 0x0a:
444 err = "Invalid length";
445 break;
446 case 0x13:
447 err = "Buffer already exists";
448 break;
449 case 0x3e:
450 err = "Buffer overlap";
451 break;
452 case 0x5c:
453 err = "Paging or storage error";
454 break;
455 }
456 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
457 cpu, rc, err);
458 return;
459 }
460
461 /* Set indication that an iucv buffer exists for this cpu. */
462 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
463
464 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
465 /* Enable iucv interrupts on this cpu. */
466 iucv_allow_cpu(NULL);
467 else
468 /* Disable iucv interrupts on this cpu. */
469 iucv_block_cpu(NULL);
470}
471
472/**
473 * iucv_retrieve_cpu
474 * @data: unused
475 *
476 * Retrieve interrupt buffer on this cpu.
477 */
478static void iucv_retrieve_cpu(void *data)
479{
480 int cpu = smp_processor_id();
481 union iucv_param *parm;
482
483 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
484 return;
485
486 /* Block iucv interrupts. */
487 iucv_block_cpu(NULL);
488
489 /* Retrieve interrupt buffer. */
490 parm = iucv_param_irq[cpu];
491 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
492
493 /* Clear indication that an iucv buffer exists for this cpu. */
494 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
495}
496
497/*
498 * iucv_setmask_mp
499 *
500 * Allow iucv interrupts on all cpus.
501 */
502static void iucv_setmask_mp(void)
503{
504 int cpu;
505
506 cpus_read_lock();
507 for_each_online_cpu(cpu)
508 /* Enable all cpus with a declared buffer. */
509 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
510 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
511 smp_call_function_single(cpu, iucv_allow_cpu,
512 NULL, 1);
513 cpus_read_unlock();
514}
515
516/*
517 * iucv_setmask_up
518 *
519 * Allow iucv interrupts on a single cpu.
520 */
521static void iucv_setmask_up(void)
522{
523 cpumask_t cpumask;
524 int cpu;
525
526 /* Disable all cpu but the first in cpu_irq_cpumask. */
527 cpumask_copy(&cpumask, &iucv_irq_cpumask);
528 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
529 for_each_cpu(cpu, &cpumask)
530 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
531}
532
533/*
534 * iucv_enable
535 *
536 * This function makes iucv ready for use. It allocates the pathid
537 * table, declares an iucv interrupt buffer and enables the iucv
538 * interrupts. Called when the first user has registered an iucv
539 * handler.
540 */
541static int iucv_enable(void)
542{
543 size_t alloc_size;
544 int cpu, rc;
545
546 cpus_read_lock();
547 rc = -ENOMEM;
548 alloc_size = iucv_max_pathid * sizeof(*iucv_path_table);
549 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
550 if (!iucv_path_table)
551 goto out;
552 /* Declare per cpu buffers. */
553 rc = -EIO;
554 for_each_online_cpu(cpu)
555 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
556 if (cpumask_empty(&iucv_buffer_cpumask))
557 /* No cpu could declare an iucv buffer. */
558 goto out;
559 cpus_read_unlock();
560 return 0;
561out:
562 kfree(iucv_path_table);
563 iucv_path_table = NULL;
564 cpus_read_unlock();
565 return rc;
566}
567
568/*
569 * iucv_disable
570 *
571 * This function shuts down iucv. It disables iucv interrupts, retrieves
572 * the iucv interrupt buffer and frees the pathid table. Called after the
573 * last user unregister its iucv handler.
574 */
575static void iucv_disable(void)
576{
577 cpus_read_lock();
578 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
579 kfree(iucv_path_table);
580 iucv_path_table = NULL;
581 cpus_read_unlock();
582}
583
584static int iucv_cpu_dead(unsigned int cpu)
585{
586 kfree(iucv_param_irq[cpu]);
587 iucv_param_irq[cpu] = NULL;
588 kfree(iucv_param[cpu]);
589 iucv_param[cpu] = NULL;
590 kfree(iucv_irq_data[cpu]);
591 iucv_irq_data[cpu] = NULL;
592 return 0;
593}
594
595static int iucv_cpu_prepare(unsigned int cpu)
596{
597 /* Note: GFP_DMA used to get memory below 2G */
598 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
599 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
600 if (!iucv_irq_data[cpu])
601 goto out_free;
602
603 /* Allocate parameter blocks. */
604 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
605 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
606 if (!iucv_param[cpu])
607 goto out_free;
608
609 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
610 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
611 if (!iucv_param_irq[cpu])
612 goto out_free;
613
614 return 0;
615
616out_free:
617 iucv_cpu_dead(cpu);
618 return -ENOMEM;
619}
620
621static int iucv_cpu_online(unsigned int cpu)
622{
623 if (!iucv_path_table)
624 return 0;
625 iucv_declare_cpu(NULL);
626 return 0;
627}
628
629static int iucv_cpu_down_prep(unsigned int cpu)
630{
631 cpumask_t cpumask;
632
633 if (!iucv_path_table)
634 return 0;
635
636 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
637 cpumask_clear_cpu(cpu, &cpumask);
638 if (cpumask_empty(&cpumask))
639 /* Can't offline last IUCV enabled cpu. */
640 return -EINVAL;
641
642 iucv_retrieve_cpu(NULL);
643 if (!cpumask_empty(&iucv_irq_cpumask))
644 return 0;
645 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
646 iucv_allow_cpu, NULL, 1);
647 return 0;
648}
649
650/**
651 * iucv_sever_pathid
652 * @pathid: path identification number.
653 * @userdata: 16-bytes of user data.
654 *
655 * Sever an iucv path to free up the pathid. Used internally.
656 */
657static int iucv_sever_pathid(u16 pathid, u8 *userdata)
658{
659 union iucv_param *parm;
660
661 parm = iucv_param_irq[smp_processor_id()];
662 memset(parm, 0, sizeof(union iucv_param));
663 if (userdata)
664 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
665 parm->ctrl.ippathid = pathid;
666 return iucv_call_b2f0(IUCV_SEVER, parm);
667}
668
669/**
670 * __iucv_cleanup_queue
671 * @dummy: unused dummy argument
672 *
673 * Nop function called via smp_call_function to force work items from
674 * pending external iucv interrupts to the work queue.
675 */
676static void __iucv_cleanup_queue(void *dummy)
677{
678}
679
680/**
681 * iucv_cleanup_queue
682 *
683 * Function called after a path has been severed to find all remaining
684 * work items for the now stale pathid. The caller needs to hold the
685 * iucv_table_lock.
686 */
687static void iucv_cleanup_queue(void)
688{
689 struct iucv_irq_list *p, *n;
690
691 /*
692 * When a path is severed, the pathid can be reused immediately
693 * on a iucv connect or a connection pending interrupt. Remove
694 * all entries from the task queue that refer to a stale pathid
695 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
696 * or deliver the connection pending interrupt. To get all the
697 * pending interrupts force them to the work queue by calling
698 * an empty function on all cpus.
699 */
700 smp_call_function(__iucv_cleanup_queue, NULL, 1);
701 spin_lock_irq(&iucv_queue_lock);
702 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
703 /* Remove stale work items from the task queue. */
704 if (iucv_path_table[p->data.ippathid] == NULL) {
705 list_del(&p->list);
706 kfree(p);
707 }
708 }
709 spin_unlock_irq(&iucv_queue_lock);
710}
711
712/**
713 * iucv_register:
714 * @handler: address of iucv handler structure
715 * @smp: != 0 indicates that the handler can deal with out of order messages
716 *
717 * Registers a driver with IUCV.
718 *
719 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
720 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
721 */
722int iucv_register(struct iucv_handler *handler, int smp)
723{
724 int rc;
725
726 if (!iucv_available)
727 return -ENOSYS;
728 mutex_lock(&iucv_register_mutex);
729 if (!smp)
730 iucv_nonsmp_handler++;
731 if (list_empty(&iucv_handler_list)) {
732 rc = iucv_enable();
733 if (rc)
734 goto out_mutex;
735 } else if (!smp && iucv_nonsmp_handler == 1)
736 iucv_setmask_up();
737 INIT_LIST_HEAD(&handler->paths);
738
739 spin_lock_bh(&iucv_table_lock);
740 list_add_tail(&handler->list, &iucv_handler_list);
741 spin_unlock_bh(&iucv_table_lock);
742 rc = 0;
743out_mutex:
744 mutex_unlock(&iucv_register_mutex);
745 return rc;
746}
747EXPORT_SYMBOL(iucv_register);
748
749/**
750 * iucv_unregister
751 * @handler: address of iucv handler structure
752 * @smp: != 0 indicates that the handler can deal with out of order messages
753 *
754 * Unregister driver from IUCV.
755 */
756void iucv_unregister(struct iucv_handler *handler, int smp)
757{
758 struct iucv_path *p, *n;
759
760 mutex_lock(&iucv_register_mutex);
761 spin_lock_bh(&iucv_table_lock);
762 /* Remove handler from the iucv_handler_list. */
763 list_del_init(&handler->list);
764 /* Sever all pathids still referring to the handler. */
765 list_for_each_entry_safe(p, n, &handler->paths, list) {
766 iucv_sever_pathid(p->pathid, NULL);
767 iucv_path_table[p->pathid] = NULL;
768 list_del(&p->list);
769 iucv_path_free(p);
770 }
771 spin_unlock_bh(&iucv_table_lock);
772 if (!smp)
773 iucv_nonsmp_handler--;
774 if (list_empty(&iucv_handler_list))
775 iucv_disable();
776 else if (!smp && iucv_nonsmp_handler == 0)
777 iucv_setmask_mp();
778 mutex_unlock(&iucv_register_mutex);
779}
780EXPORT_SYMBOL(iucv_unregister);
781
782static int iucv_reboot_event(struct notifier_block *this,
783 unsigned long event, void *ptr)
784{
785 int i;
786
787 if (cpumask_empty(&iucv_irq_cpumask))
788 return NOTIFY_DONE;
789
790 cpus_read_lock();
791 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
792 preempt_disable();
793 for (i = 0; i < iucv_max_pathid; i++) {
794 if (iucv_path_table[i])
795 iucv_sever_pathid(i, NULL);
796 }
797 preempt_enable();
798 cpus_read_unlock();
799 iucv_disable();
800 return NOTIFY_DONE;
801}
802
803static struct notifier_block iucv_reboot_notifier = {
804 .notifier_call = iucv_reboot_event,
805};
806
807/**
808 * iucv_path_accept
809 * @path: address of iucv path structure
810 * @handler: address of iucv handler structure
811 * @userdata: 16 bytes of data reflected to the communication partner
812 * @private: private data passed to interrupt handlers for this path
813 *
814 * This function is issued after the user received a connection pending
815 * external interrupt and now wishes to complete the IUCV communication path.
816 *
817 * Returns the result of the CP IUCV call.
818 */
819int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
820 u8 *userdata, void *private)
821{
822 union iucv_param *parm;
823 int rc;
824
825 local_bh_disable();
826 if (cpumask_empty(&iucv_buffer_cpumask)) {
827 rc = -EIO;
828 goto out;
829 }
830 /* Prepare parameter block. */
831 parm = iucv_param[smp_processor_id()];
832 memset(parm, 0, sizeof(union iucv_param));
833 parm->ctrl.ippathid = path->pathid;
834 parm->ctrl.ipmsglim = path->msglim;
835 if (userdata)
836 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
837 parm->ctrl.ipflags1 = path->flags;
838
839 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
840 if (!rc) {
841 path->private = private;
842 path->msglim = parm->ctrl.ipmsglim;
843 path->flags = parm->ctrl.ipflags1;
844 }
845out:
846 local_bh_enable();
847 return rc;
848}
849EXPORT_SYMBOL(iucv_path_accept);
850
851/**
852 * iucv_path_connect
853 * @path: address of iucv path structure
854 * @handler: address of iucv handler structure
855 * @userid: 8-byte user identification
856 * @system: 8-byte target system identification
857 * @userdata: 16 bytes of data reflected to the communication partner
858 * @private: private data passed to interrupt handlers for this path
859 *
860 * This function establishes an IUCV path. Although the connect may complete
861 * successfully, you are not able to use the path until you receive an IUCV
862 * Connection Complete external interrupt.
863 *
864 * Returns the result of the CP IUCV call.
865 */
866int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
867 u8 *userid, u8 *system, u8 *userdata,
868 void *private)
869{
870 union iucv_param *parm;
871 int rc;
872
873 spin_lock_bh(&iucv_table_lock);
874 iucv_cleanup_queue();
875 if (cpumask_empty(&iucv_buffer_cpumask)) {
876 rc = -EIO;
877 goto out;
878 }
879 parm = iucv_param[smp_processor_id()];
880 memset(parm, 0, sizeof(union iucv_param));
881 parm->ctrl.ipmsglim = path->msglim;
882 parm->ctrl.ipflags1 = path->flags;
883 if (userid) {
884 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
885 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
886 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
887 }
888 if (system) {
889 memcpy(parm->ctrl.iptarget, system,
890 sizeof(parm->ctrl.iptarget));
891 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
892 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
893 }
894 if (userdata)
895 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
896
897 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
898 if (!rc) {
899 if (parm->ctrl.ippathid < iucv_max_pathid) {
900 path->pathid = parm->ctrl.ippathid;
901 path->msglim = parm->ctrl.ipmsglim;
902 path->flags = parm->ctrl.ipflags1;
903 path->handler = handler;
904 path->private = private;
905 list_add_tail(&path->list, &handler->paths);
906 iucv_path_table[path->pathid] = path;
907 } else {
908 iucv_sever_pathid(parm->ctrl.ippathid,
909 iucv_error_pathid);
910 rc = -EIO;
911 }
912 }
913out:
914 spin_unlock_bh(&iucv_table_lock);
915 return rc;
916}
917EXPORT_SYMBOL(iucv_path_connect);
918
919/**
920 * iucv_path_quiesce:
921 * @path: address of iucv path structure
922 * @userdata: 16 bytes of data reflected to the communication partner
923 *
924 * This function temporarily suspends incoming messages on an IUCV path.
925 * You can later reactivate the path by invoking the iucv_resume function.
926 *
927 * Returns the result from the CP IUCV call.
928 */
929int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
930{
931 union iucv_param *parm;
932 int rc;
933
934 local_bh_disable();
935 if (cpumask_empty(&iucv_buffer_cpumask)) {
936 rc = -EIO;
937 goto out;
938 }
939 parm = iucv_param[smp_processor_id()];
940 memset(parm, 0, sizeof(union iucv_param));
941 if (userdata)
942 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
943 parm->ctrl.ippathid = path->pathid;
944 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
945out:
946 local_bh_enable();
947 return rc;
948}
949EXPORT_SYMBOL(iucv_path_quiesce);
950
951/**
952 * iucv_path_resume:
953 * @path: address of iucv path structure
954 * @userdata: 16 bytes of data reflected to the communication partner
955 *
956 * This function resumes incoming messages on an IUCV path that has
957 * been stopped with iucv_path_quiesce.
958 *
959 * Returns the result from the CP IUCV call.
960 */
961int iucv_path_resume(struct iucv_path *path, u8 *userdata)
962{
963 union iucv_param *parm;
964 int rc;
965
966 local_bh_disable();
967 if (cpumask_empty(&iucv_buffer_cpumask)) {
968 rc = -EIO;
969 goto out;
970 }
971 parm = iucv_param[smp_processor_id()];
972 memset(parm, 0, sizeof(union iucv_param));
973 if (userdata)
974 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
975 parm->ctrl.ippathid = path->pathid;
976 rc = iucv_call_b2f0(IUCV_RESUME, parm);
977out:
978 local_bh_enable();
979 return rc;
980}
981
982/**
983 * iucv_path_sever
984 * @path: address of iucv path structure
985 * @userdata: 16 bytes of data reflected to the communication partner
986 *
987 * This function terminates an IUCV path.
988 *
989 * Returns the result from the CP IUCV call.
990 */
991int iucv_path_sever(struct iucv_path *path, u8 *userdata)
992{
993 int rc;
994
995 preempt_disable();
996 if (cpumask_empty(&iucv_buffer_cpumask)) {
997 rc = -EIO;
998 goto out;
999 }
1000 if (iucv_active_cpu != smp_processor_id())
1001 spin_lock_bh(&iucv_table_lock);
1002 rc = iucv_sever_pathid(path->pathid, userdata);
1003 iucv_path_table[path->pathid] = NULL;
1004 list_del_init(&path->list);
1005 if (iucv_active_cpu != smp_processor_id())
1006 spin_unlock_bh(&iucv_table_lock);
1007out:
1008 preempt_enable();
1009 return rc;
1010}
1011EXPORT_SYMBOL(iucv_path_sever);
1012
1013/**
1014 * iucv_message_purge
1015 * @path: address of iucv path structure
1016 * @msg: address of iucv msg structure
1017 * @srccls: source class of message
1018 *
1019 * Cancels a message you have sent.
1020 *
1021 * Returns the result from the CP IUCV call.
1022 */
1023int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1024 u32 srccls)
1025{
1026 union iucv_param *parm;
1027 int rc;
1028
1029 local_bh_disable();
1030 if (cpumask_empty(&iucv_buffer_cpumask)) {
1031 rc = -EIO;
1032 goto out;
1033 }
1034 parm = iucv_param[smp_processor_id()];
1035 memset(parm, 0, sizeof(union iucv_param));
1036 parm->purge.ippathid = path->pathid;
1037 parm->purge.ipmsgid = msg->id;
1038 parm->purge.ipsrccls = srccls;
1039 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1040 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1041 if (!rc) {
1042 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1043 msg->tag = parm->purge.ipmsgtag;
1044 }
1045out:
1046 local_bh_enable();
1047 return rc;
1048}
1049EXPORT_SYMBOL(iucv_message_purge);
1050
1051/**
1052 * iucv_message_receive_iprmdata
1053 * @path: address of iucv path structure
1054 * @msg: address of iucv msg structure
1055 * @flags: how the message is received (IUCV_IPBUFLST)
1056 * @buffer: address of data buffer or address of struct iucv_array
1057 * @size: length of data buffer
1058 * @residual:
1059 *
1060 * Internal function used by iucv_message_receive and __iucv_message_receive
1061 * to receive RMDATA data stored in struct iucv_message.
1062 */
1063static int iucv_message_receive_iprmdata(struct iucv_path *path,
1064 struct iucv_message *msg,
1065 u8 flags, void *buffer,
1066 size_t size, size_t *residual)
1067{
1068 struct iucv_array *array;
1069 u8 *rmmsg;
1070 size_t copy;
1071
1072 /*
1073 * Message is 8 bytes long and has been stored to the
1074 * message descriptor itself.
1075 */
1076 if (residual)
1077 *residual = abs(size - 8);
1078 rmmsg = msg->rmmsg;
1079 if (flags & IUCV_IPBUFLST) {
1080 /* Copy to struct iucv_array. */
1081 size = (size < 8) ? size : 8;
1082 for (array = buffer; size > 0; array++) {
1083 copy = min_t(size_t, size, array->length);
1084 memcpy(dma32_to_virt(array->address), rmmsg, copy);
1085 rmmsg += copy;
1086 size -= copy;
1087 }
1088 } else {
1089 /* Copy to direct buffer. */
1090 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1091 }
1092 return 0;
1093}
1094
1095/**
1096 * __iucv_message_receive
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 * This function receives messages that are being sent to you over
1105 * established paths. This function will deal with RMDATA messages
1106 * embedded in struct iucv_message as well.
1107 *
1108 * Locking: no locking
1109 *
1110 * Returns the result from the CP IUCV call.
1111 */
1112int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1113 u8 flags, void *buffer, size_t size, size_t *residual)
1114{
1115 union iucv_param *parm;
1116 int rc;
1117
1118 if (msg->flags & IUCV_IPRMDATA)
1119 return iucv_message_receive_iprmdata(path, msg, flags,
1120 buffer, size, residual);
1121 if (cpumask_empty(&iucv_buffer_cpumask))
1122 return -EIO;
1123
1124 parm = iucv_param[smp_processor_id()];
1125 memset(parm, 0, sizeof(union iucv_param));
1126 parm->db.ipbfadr1 = virt_to_dma32(buffer);
1127 parm->db.ipbfln1f = (u32) size;
1128 parm->db.ipmsgid = msg->id;
1129 parm->db.ippathid = path->pathid;
1130 parm->db.iptrgcls = msg->class;
1131 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1132 IUCV_IPFGMID | IUCV_IPTRGCLS);
1133 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1134 if (!rc || rc == 5) {
1135 msg->flags = parm->db.ipflags1;
1136 if (residual)
1137 *residual = parm->db.ipbfln1f;
1138 }
1139 return rc;
1140}
1141EXPORT_SYMBOL(__iucv_message_receive);
1142
1143/**
1144 * iucv_message_receive
1145 * @path: address of iucv path structure
1146 * @msg: address of iucv msg structure
1147 * @flags: how the message is received (IUCV_IPBUFLST)
1148 * @buffer: address of data buffer or address of struct iucv_array
1149 * @size: length of data buffer
1150 * @residual:
1151 *
1152 * This function receives messages that are being sent to you over
1153 * established paths. This function will deal with RMDATA messages
1154 * embedded in struct iucv_message as well.
1155 *
1156 * Locking: local_bh_enable/local_bh_disable
1157 *
1158 * Returns the result from the CP IUCV call.
1159 */
1160int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1161 u8 flags, void *buffer, size_t size, size_t *residual)
1162{
1163 int rc;
1164
1165 if (msg->flags & IUCV_IPRMDATA)
1166 return iucv_message_receive_iprmdata(path, msg, flags,
1167 buffer, size, residual);
1168 local_bh_disable();
1169 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1170 local_bh_enable();
1171 return rc;
1172}
1173EXPORT_SYMBOL(iucv_message_receive);
1174
1175/**
1176 * iucv_message_reject
1177 * @path: address of iucv path structure
1178 * @msg: address of iucv msg structure
1179 *
1180 * The reject function refuses a specified message. Between the time you
1181 * are notified of a message and the time that you complete the message,
1182 * the message may be rejected.
1183 *
1184 * Returns the result from the CP IUCV call.
1185 */
1186int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1187{
1188 union iucv_param *parm;
1189 int rc;
1190
1191 local_bh_disable();
1192 if (cpumask_empty(&iucv_buffer_cpumask)) {
1193 rc = -EIO;
1194 goto out;
1195 }
1196 parm = iucv_param[smp_processor_id()];
1197 memset(parm, 0, sizeof(union iucv_param));
1198 parm->db.ippathid = path->pathid;
1199 parm->db.ipmsgid = msg->id;
1200 parm->db.iptrgcls = msg->class;
1201 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1202 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1203out:
1204 local_bh_enable();
1205 return rc;
1206}
1207EXPORT_SYMBOL(iucv_message_reject);
1208
1209/**
1210 * iucv_message_reply
1211 * @path: address of iucv path structure
1212 * @msg: address of iucv msg structure
1213 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1214 * @reply: address of reply data buffer or address of struct iucv_array
1215 * @size: length of reply data buffer
1216 *
1217 * This function responds to the two-way messages that you receive. You
1218 * must identify completely the message to which you wish to reply. ie,
1219 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1220 * the parameter list.
1221 *
1222 * Returns the result from the CP IUCV call.
1223 */
1224int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1225 u8 flags, void *reply, size_t size)
1226{
1227 union iucv_param *parm;
1228 int rc;
1229
1230 local_bh_disable();
1231 if (cpumask_empty(&iucv_buffer_cpumask)) {
1232 rc = -EIO;
1233 goto out;
1234 }
1235 parm = iucv_param[smp_processor_id()];
1236 memset(parm, 0, sizeof(union iucv_param));
1237 if (flags & IUCV_IPRMDATA) {
1238 parm->dpl.ippathid = path->pathid;
1239 parm->dpl.ipflags1 = flags;
1240 parm->dpl.ipmsgid = msg->id;
1241 parm->dpl.iptrgcls = msg->class;
1242 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1243 } else {
1244 parm->db.ipbfadr1 = virt_to_dma32(reply);
1245 parm->db.ipbfln1f = (u32) size;
1246 parm->db.ippathid = path->pathid;
1247 parm->db.ipflags1 = flags;
1248 parm->db.ipmsgid = msg->id;
1249 parm->db.iptrgcls = msg->class;
1250 }
1251 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1252out:
1253 local_bh_enable();
1254 return rc;
1255}
1256EXPORT_SYMBOL(iucv_message_reply);
1257
1258/**
1259 * __iucv_message_send
1260 * @path: address of iucv path structure
1261 * @msg: address of iucv msg structure
1262 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1263 * @srccls: source class of message
1264 * @buffer: address of send buffer or address of struct iucv_array
1265 * @size: length of send buffer
1266 *
1267 * This function transmits data to another application. Data to be
1268 * transmitted is in a buffer and this is a one-way message and the
1269 * receiver will not reply to the message.
1270 *
1271 * Locking: no locking
1272 *
1273 * Returns the result from the CP IUCV call.
1274 */
1275int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1276 u8 flags, u32 srccls, void *buffer, size_t size)
1277{
1278 union iucv_param *parm;
1279 int rc;
1280
1281 if (cpumask_empty(&iucv_buffer_cpumask)) {
1282 rc = -EIO;
1283 goto out;
1284 }
1285 parm = iucv_param[smp_processor_id()];
1286 memset(parm, 0, sizeof(union iucv_param));
1287 if (flags & IUCV_IPRMDATA) {
1288 /* Message of 8 bytes can be placed into the parameter list. */
1289 parm->dpl.ippathid = path->pathid;
1290 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1291 parm->dpl.iptrgcls = msg->class;
1292 parm->dpl.ipsrccls = srccls;
1293 parm->dpl.ipmsgtag = msg->tag;
1294 memcpy(parm->dpl.iprmmsg, buffer, 8);
1295 } else {
1296 parm->db.ipbfadr1 = virt_to_dma32(buffer);
1297 parm->db.ipbfln1f = (u32) size;
1298 parm->db.ippathid = path->pathid;
1299 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1300 parm->db.iptrgcls = msg->class;
1301 parm->db.ipsrccls = srccls;
1302 parm->db.ipmsgtag = msg->tag;
1303 }
1304 rc = iucv_call_b2f0(IUCV_SEND, parm);
1305 if (!rc)
1306 msg->id = parm->db.ipmsgid;
1307out:
1308 return rc;
1309}
1310EXPORT_SYMBOL(__iucv_message_send);
1311
1312/**
1313 * iucv_message_send
1314 * @path: address of iucv path structure
1315 * @msg: address of iucv msg structure
1316 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1317 * @srccls: source class of message
1318 * @buffer: address of send buffer or address of struct iucv_array
1319 * @size: length of send buffer
1320 *
1321 * This function transmits data to another application. Data to be
1322 * transmitted is in a buffer and this is a one-way message and the
1323 * receiver will not reply to the message.
1324 *
1325 * Locking: local_bh_enable/local_bh_disable
1326 *
1327 * Returns the result from the CP IUCV call.
1328 */
1329int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1330 u8 flags, u32 srccls, void *buffer, size_t size)
1331{
1332 int rc;
1333
1334 local_bh_disable();
1335 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1336 local_bh_enable();
1337 return rc;
1338}
1339EXPORT_SYMBOL(iucv_message_send);
1340
1341/**
1342 * iucv_message_send2way
1343 * @path: address of iucv path structure
1344 * @msg: address of iucv msg structure
1345 * @flags: how the message is sent and the reply is received
1346 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1347 * @srccls: source class of message
1348 * @buffer: address of send buffer or address of struct iucv_array
1349 * @size: length of send buffer
1350 * @answer: address of answer buffer or address of struct iucv_array
1351 * @asize: size of reply buffer
1352 * @residual: ignored
1353 *
1354 * This function transmits data to another application. Data to be
1355 * transmitted is in a buffer. The receiver of the send is expected to
1356 * reply to the message and a buffer is provided into which IUCV moves
1357 * the reply to this message.
1358 *
1359 * Returns the result from the CP IUCV call.
1360 */
1361int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1362 u8 flags, u32 srccls, void *buffer, size_t size,
1363 void *answer, size_t asize, size_t *residual)
1364{
1365 union iucv_param *parm;
1366 int rc;
1367
1368 local_bh_disable();
1369 if (cpumask_empty(&iucv_buffer_cpumask)) {
1370 rc = -EIO;
1371 goto out;
1372 }
1373 parm = iucv_param[smp_processor_id()];
1374 memset(parm, 0, sizeof(union iucv_param));
1375 if (flags & IUCV_IPRMDATA) {
1376 parm->dpl.ippathid = path->pathid;
1377 parm->dpl.ipflags1 = path->flags; /* priority message */
1378 parm->dpl.iptrgcls = msg->class;
1379 parm->dpl.ipsrccls = srccls;
1380 parm->dpl.ipmsgtag = msg->tag;
1381 parm->dpl.ipbfadr2 = virt_to_dma32(answer);
1382 parm->dpl.ipbfln2f = (u32) asize;
1383 memcpy(parm->dpl.iprmmsg, buffer, 8);
1384 } else {
1385 parm->db.ippathid = path->pathid;
1386 parm->db.ipflags1 = path->flags; /* priority message */
1387 parm->db.iptrgcls = msg->class;
1388 parm->db.ipsrccls = srccls;
1389 parm->db.ipmsgtag = msg->tag;
1390 parm->db.ipbfadr1 = virt_to_dma32(buffer);
1391 parm->db.ipbfln1f = (u32) size;
1392 parm->db.ipbfadr2 = virt_to_dma32(answer);
1393 parm->db.ipbfln2f = (u32) asize;
1394 }
1395 rc = iucv_call_b2f0(IUCV_SEND, parm);
1396 if (!rc)
1397 msg->id = parm->db.ipmsgid;
1398out:
1399 local_bh_enable();
1400 return rc;
1401}
1402EXPORT_SYMBOL(iucv_message_send2way);
1403
1404struct iucv_path_pending {
1405 u16 ippathid;
1406 u8 ipflags1;
1407 u8 iptype;
1408 u16 ipmsglim;
1409 u16 res1;
1410 u8 ipvmid[8];
1411 u8 ipuser[16];
1412 u32 res3;
1413 u8 ippollfg;
1414 u8 res4[3];
1415} __packed;
1416
1417/**
1418 * iucv_path_pending
1419 * @data: Pointer to external interrupt buffer
1420 *
1421 * Process connection pending work item. Called from tasklet while holding
1422 * iucv_table_lock.
1423 */
1424static void iucv_path_pending(struct iucv_irq_data *data)
1425{
1426 struct iucv_path_pending *ipp = (void *) data;
1427 struct iucv_handler *handler;
1428 struct iucv_path *path;
1429 char *error;
1430
1431 BUG_ON(iucv_path_table[ipp->ippathid]);
1432 /* New pathid, handler found. Create a new path struct. */
1433 error = iucv_error_no_memory;
1434 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1435 if (!path)
1436 goto out_sever;
1437 path->pathid = ipp->ippathid;
1438 iucv_path_table[path->pathid] = path;
1439 EBCASC(ipp->ipvmid, 8);
1440
1441 /* Call registered handler until one is found that wants the path. */
1442 list_for_each_entry(handler, &iucv_handler_list, list) {
1443 if (!handler->path_pending)
1444 continue;
1445 /*
1446 * Add path to handler to allow a call to iucv_path_sever
1447 * inside the path_pending function. If the handler returns
1448 * an error remove the path from the handler again.
1449 */
1450 list_add(&path->list, &handler->paths);
1451 path->handler = handler;
1452 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1453 return;
1454 list_del(&path->list);
1455 path->handler = NULL;
1456 }
1457 /* No handler wanted the path. */
1458 iucv_path_table[path->pathid] = NULL;
1459 iucv_path_free(path);
1460 error = iucv_error_no_listener;
1461out_sever:
1462 iucv_sever_pathid(ipp->ippathid, error);
1463}
1464
1465struct iucv_path_complete {
1466 u16 ippathid;
1467 u8 ipflags1;
1468 u8 iptype;
1469 u16 ipmsglim;
1470 u16 res1;
1471 u8 res2[8];
1472 u8 ipuser[16];
1473 u32 res3;
1474 u8 ippollfg;
1475 u8 res4[3];
1476} __packed;
1477
1478/**
1479 * iucv_path_complete
1480 * @data: Pointer to external interrupt buffer
1481 *
1482 * Process connection complete work item. Called from tasklet while holding
1483 * iucv_table_lock.
1484 */
1485static void iucv_path_complete(struct iucv_irq_data *data)
1486{
1487 struct iucv_path_complete *ipc = (void *) data;
1488 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1489
1490 if (path)
1491 path->flags = ipc->ipflags1;
1492 if (path && path->handler && path->handler->path_complete)
1493 path->handler->path_complete(path, ipc->ipuser);
1494}
1495
1496struct iucv_path_severed {
1497 u16 ippathid;
1498 u8 res1;
1499 u8 iptype;
1500 u32 res2;
1501 u8 res3[8];
1502 u8 ipuser[16];
1503 u32 res4;
1504 u8 ippollfg;
1505 u8 res5[3];
1506} __packed;
1507
1508/**
1509 * iucv_path_severed
1510 * @data: Pointer to external interrupt buffer
1511 *
1512 * Process connection severed work item. Called from tasklet while holding
1513 * iucv_table_lock.
1514 */
1515static void iucv_path_severed(struct iucv_irq_data *data)
1516{
1517 struct iucv_path_severed *ips = (void *) data;
1518 struct iucv_path *path = iucv_path_table[ips->ippathid];
1519
1520 if (!path || !path->handler) /* Already severed */
1521 return;
1522 if (path->handler->path_severed)
1523 path->handler->path_severed(path, ips->ipuser);
1524 else {
1525 iucv_sever_pathid(path->pathid, NULL);
1526 iucv_path_table[path->pathid] = NULL;
1527 list_del(&path->list);
1528 iucv_path_free(path);
1529 }
1530}
1531
1532struct iucv_path_quiesced {
1533 u16 ippathid;
1534 u8 res1;
1535 u8 iptype;
1536 u32 res2;
1537 u8 res3[8];
1538 u8 ipuser[16];
1539 u32 res4;
1540 u8 ippollfg;
1541 u8 res5[3];
1542} __packed;
1543
1544/**
1545 * iucv_path_quiesced
1546 * @data: Pointer to external interrupt buffer
1547 *
1548 * Process connection quiesced work item. Called from tasklet while holding
1549 * iucv_table_lock.
1550 */
1551static void iucv_path_quiesced(struct iucv_irq_data *data)
1552{
1553 struct iucv_path_quiesced *ipq = (void *) data;
1554 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1555
1556 if (path && path->handler && path->handler->path_quiesced)
1557 path->handler->path_quiesced(path, ipq->ipuser);
1558}
1559
1560struct iucv_path_resumed {
1561 u16 ippathid;
1562 u8 res1;
1563 u8 iptype;
1564 u32 res2;
1565 u8 res3[8];
1566 u8 ipuser[16];
1567 u32 res4;
1568 u8 ippollfg;
1569 u8 res5[3];
1570} __packed;
1571
1572/**
1573 * iucv_path_resumed
1574 * @data: Pointer to external interrupt buffer
1575 *
1576 * Process connection resumed work item. Called from tasklet while holding
1577 * iucv_table_lock.
1578 */
1579static void iucv_path_resumed(struct iucv_irq_data *data)
1580{
1581 struct iucv_path_resumed *ipr = (void *) data;
1582 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1583
1584 if (path && path->handler && path->handler->path_resumed)
1585 path->handler->path_resumed(path, ipr->ipuser);
1586}
1587
1588struct iucv_message_complete {
1589 u16 ippathid;
1590 u8 ipflags1;
1591 u8 iptype;
1592 u32 ipmsgid;
1593 u32 ipaudit;
1594 u8 iprmmsg[8];
1595 u32 ipsrccls;
1596 u32 ipmsgtag;
1597 u32 res;
1598 u32 ipbfln2f;
1599 u8 ippollfg;
1600 u8 res2[3];
1601} __packed;
1602
1603/**
1604 * iucv_message_complete
1605 * @data: Pointer to external interrupt buffer
1606 *
1607 * Process message complete work item. Called from tasklet while holding
1608 * iucv_table_lock.
1609 */
1610static void iucv_message_complete(struct iucv_irq_data *data)
1611{
1612 struct iucv_message_complete *imc = (void *) data;
1613 struct iucv_path *path = iucv_path_table[imc->ippathid];
1614 struct iucv_message msg;
1615
1616 if (path && path->handler && path->handler->message_complete) {
1617 msg.flags = imc->ipflags1;
1618 msg.id = imc->ipmsgid;
1619 msg.audit = imc->ipaudit;
1620 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1621 msg.class = imc->ipsrccls;
1622 msg.tag = imc->ipmsgtag;
1623 msg.length = imc->ipbfln2f;
1624 path->handler->message_complete(path, &msg);
1625 }
1626}
1627
1628struct iucv_message_pending {
1629 u16 ippathid;
1630 u8 ipflags1;
1631 u8 iptype;
1632 u32 ipmsgid;
1633 u32 iptrgcls;
1634 struct {
1635 union {
1636 u32 iprmmsg1_u32;
1637 u8 iprmmsg1[4];
1638 } ln1msg1;
1639 union {
1640 u32 ipbfln1f;
1641 u8 iprmmsg2[4];
1642 } ln1msg2;
1643 } rmmsg;
1644 u32 res1[3];
1645 u32 ipbfln2f;
1646 u8 ippollfg;
1647 u8 res2[3];
1648} __packed;
1649
1650/**
1651 * iucv_message_pending
1652 * @data: Pointer to external interrupt buffer
1653 *
1654 * Process message pending work item. Called from tasklet while holding
1655 * iucv_table_lock.
1656 */
1657static void iucv_message_pending(struct iucv_irq_data *data)
1658{
1659 struct iucv_message_pending *imp = (void *) data;
1660 struct iucv_path *path = iucv_path_table[imp->ippathid];
1661 struct iucv_message msg;
1662
1663 if (path && path->handler && path->handler->message_pending) {
1664 msg.flags = imp->ipflags1;
1665 msg.id = imp->ipmsgid;
1666 msg.class = imp->iptrgcls;
1667 if (imp->ipflags1 & IUCV_IPRMDATA) {
1668 memcpy(msg.rmmsg, &imp->rmmsg, 8);
1669 msg.length = 8;
1670 } else
1671 msg.length = imp->rmmsg.ln1msg2.ipbfln1f;
1672 msg.reply_size = imp->ipbfln2f;
1673 path->handler->message_pending(path, &msg);
1674 }
1675}
1676
1677/*
1678 * iucv_tasklet_fn:
1679 *
1680 * This tasklet loops over the queue of irq buffers created by
1681 * iucv_external_interrupt, calls the appropriate action handler
1682 * and then frees the buffer.
1683 */
1684static void iucv_tasklet_fn(unsigned long ignored)
1685{
1686 typedef void iucv_irq_fn(struct iucv_irq_data *);
1687 static iucv_irq_fn *irq_fn[] = {
1688 [0x02] = iucv_path_complete,
1689 [0x03] = iucv_path_severed,
1690 [0x04] = iucv_path_quiesced,
1691 [0x05] = iucv_path_resumed,
1692 [0x06] = iucv_message_complete,
1693 [0x07] = iucv_message_complete,
1694 [0x08] = iucv_message_pending,
1695 [0x09] = iucv_message_pending,
1696 };
1697 LIST_HEAD(task_queue);
1698 struct iucv_irq_list *p, *n;
1699
1700 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1701 if (!spin_trylock(&iucv_table_lock)) {
1702 tasklet_schedule(&iucv_tasklet);
1703 return;
1704 }
1705 iucv_active_cpu = smp_processor_id();
1706
1707 spin_lock_irq(&iucv_queue_lock);
1708 list_splice_init(&iucv_task_queue, &task_queue);
1709 spin_unlock_irq(&iucv_queue_lock);
1710
1711 list_for_each_entry_safe(p, n, &task_queue, list) {
1712 list_del_init(&p->list);
1713 irq_fn[p->data.iptype](&p->data);
1714 kfree(p);
1715 }
1716
1717 iucv_active_cpu = -1;
1718 spin_unlock(&iucv_table_lock);
1719}
1720
1721/*
1722 * iucv_work_fn:
1723 *
1724 * This work function loops over the queue of path pending irq blocks
1725 * created by iucv_external_interrupt, calls the appropriate action
1726 * handler and then frees the buffer.
1727 */
1728static void iucv_work_fn(struct work_struct *work)
1729{
1730 LIST_HEAD(work_queue);
1731 struct iucv_irq_list *p, *n;
1732
1733 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1734 spin_lock_bh(&iucv_table_lock);
1735 iucv_active_cpu = smp_processor_id();
1736
1737 spin_lock_irq(&iucv_queue_lock);
1738 list_splice_init(&iucv_work_queue, &work_queue);
1739 spin_unlock_irq(&iucv_queue_lock);
1740
1741 iucv_cleanup_queue();
1742 list_for_each_entry_safe(p, n, &work_queue, list) {
1743 list_del_init(&p->list);
1744 iucv_path_pending(&p->data);
1745 kfree(p);
1746 }
1747
1748 iucv_active_cpu = -1;
1749 spin_unlock_bh(&iucv_table_lock);
1750}
1751
1752/*
1753 * iucv_external_interrupt
1754 *
1755 * Handles external interrupts coming in from CP.
1756 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1757 */
1758static void iucv_external_interrupt(struct ext_code ext_code,
1759 unsigned int param32, unsigned long param64)
1760{
1761 struct iucv_irq_data *p;
1762 struct iucv_irq_list *work;
1763
1764 inc_irq_stat(IRQEXT_IUC);
1765 p = iucv_irq_data[smp_processor_id()];
1766 if (p->ippathid >= iucv_max_pathid) {
1767 WARN_ON(p->ippathid >= iucv_max_pathid);
1768 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1769 return;
1770 }
1771 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1772 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1773 if (!work) {
1774 pr_warn("iucv_external_interrupt: out of memory\n");
1775 return;
1776 }
1777 memcpy(&work->data, p, sizeof(work->data));
1778 spin_lock(&iucv_queue_lock);
1779 if (p->iptype == 0x01) {
1780 /* Path pending interrupt. */
1781 list_add_tail(&work->list, &iucv_work_queue);
1782 schedule_work(&iucv_work);
1783 } else {
1784 /* The other interrupts. */
1785 list_add_tail(&work->list, &iucv_task_queue);
1786 tasklet_schedule(&iucv_tasklet);
1787 }
1788 spin_unlock(&iucv_queue_lock);
1789}
1790
1791struct iucv_interface iucv_if = {
1792 .message_receive = iucv_message_receive,
1793 .__message_receive = __iucv_message_receive,
1794 .message_reply = iucv_message_reply,
1795 .message_reject = iucv_message_reject,
1796 .message_send = iucv_message_send,
1797 .__message_send = __iucv_message_send,
1798 .message_send2way = iucv_message_send2way,
1799 .message_purge = iucv_message_purge,
1800 .path_accept = iucv_path_accept,
1801 .path_connect = iucv_path_connect,
1802 .path_quiesce = iucv_path_quiesce,
1803 .path_resume = iucv_path_resume,
1804 .path_sever = iucv_path_sever,
1805 .iucv_register = iucv_register,
1806 .iucv_unregister = iucv_unregister,
1807 .bus = NULL,
1808 .root = NULL,
1809};
1810EXPORT_SYMBOL(iucv_if);
1811
1812static enum cpuhp_state iucv_online;
1813/**
1814 * iucv_init
1815 *
1816 * Allocates and initializes various data structures.
1817 */
1818static int __init iucv_init(void)
1819{
1820 int rc;
1821
1822 if (!MACHINE_IS_VM) {
1823 rc = -EPROTONOSUPPORT;
1824 goto out;
1825 }
1826 system_ctl_set_bit(0, CR0_IUCV_BIT);
1827 rc = iucv_query_maxconn();
1828 if (rc)
1829 goto out_ctl;
1830 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1831 if (rc)
1832 goto out_ctl;
1833 iucv_root = root_device_register("iucv");
1834 if (IS_ERR(iucv_root)) {
1835 rc = PTR_ERR(iucv_root);
1836 goto out_int;
1837 }
1838
1839 rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
1840 iucv_cpu_prepare, iucv_cpu_dead);
1841 if (rc)
1842 goto out_dev;
1843 rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
1844 iucv_cpu_online, iucv_cpu_down_prep);
1845 if (rc < 0)
1846 goto out_prep;
1847 iucv_online = rc;
1848
1849 rc = register_reboot_notifier(&iucv_reboot_notifier);
1850 if (rc)
1851 goto out_remove_hp;
1852 ASCEBC(iucv_error_no_listener, 16);
1853 ASCEBC(iucv_error_no_memory, 16);
1854 ASCEBC(iucv_error_pathid, 16);
1855 iucv_available = 1;
1856 rc = bus_register(&iucv_bus);
1857 if (rc)
1858 goto out_reboot;
1859 iucv_if.root = iucv_root;
1860 iucv_if.bus = &iucv_bus;
1861 return 0;
1862
1863out_reboot:
1864 unregister_reboot_notifier(&iucv_reboot_notifier);
1865out_remove_hp:
1866 cpuhp_remove_state(iucv_online);
1867out_prep:
1868 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1869out_dev:
1870 root_device_unregister(iucv_root);
1871out_int:
1872 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1873out_ctl:
1874 system_ctl_clear_bit(0, 1);
1875out:
1876 return rc;
1877}
1878
1879/**
1880 * iucv_exit
1881 *
1882 * Frees everything allocated from iucv_init.
1883 */
1884static void __exit iucv_exit(void)
1885{
1886 struct iucv_irq_list *p, *n;
1887
1888 spin_lock_irq(&iucv_queue_lock);
1889 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1890 kfree(p);
1891 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1892 kfree(p);
1893 spin_unlock_irq(&iucv_queue_lock);
1894 unregister_reboot_notifier(&iucv_reboot_notifier);
1895
1896 cpuhp_remove_state_nocalls(iucv_online);
1897 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
1898 root_device_unregister(iucv_root);
1899 bus_unregister(&iucv_bus);
1900 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
1901}
1902
1903subsys_initcall(iucv_init);
1904module_exit(iucv_exit);
1905
1906MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert <felfert@millenux.com>");
1907MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1908MODULE_LICENSE("GPL");
1/*
2 * IUCV base infrastructure.
3 *
4 * Copyright IBM Corp. 2001, 2009
5 *
6 * Author(s):
7 * Original source:
8 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
9 * Xenia Tkatschow (xenia@us.ibm.com)
10 * 2Gb awareness and general cleanup:
11 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
12 * Rewritten for af_iucv:
13 * Martin Schwidefsky <schwidefsky@de.ibm.com>
14 * PM functions:
15 * Ursula Braun (ursula.braun@de.ibm.com)
16 *
17 * Documentation used:
18 * The original source
19 * CP Programming Service, IBM document # SC24-5760
20 *
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2, or (at your option)
24 * any later version.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 */
35
36#define KMSG_COMPONENT "iucv"
37#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
38
39#include <linux/kernel_stat.h>
40#include <linux/module.h>
41#include <linux/moduleparam.h>
42#include <linux/spinlock.h>
43#include <linux/kernel.h>
44#include <linux/slab.h>
45#include <linux/init.h>
46#include <linux/interrupt.h>
47#include <linux/list.h>
48#include <linux/errno.h>
49#include <linux/err.h>
50#include <linux/device.h>
51#include <linux/cpu.h>
52#include <linux/reboot.h>
53#include <net/iucv/iucv.h>
54#include <linux/atomic.h>
55#include <asm/ebcdic.h>
56#include <asm/io.h>
57#include <asm/irq.h>
58#include <asm/smp.h>
59
60/*
61 * FLAGS:
62 * All flags are defined in the field IPFLAGS1 of each function
63 * and can be found in CP Programming Services.
64 * IPSRCCLS - Indicates you have specified a source class.
65 * IPTRGCLS - Indicates you have specified a target class.
66 * IPFGPID - Indicates you have specified a pathid.
67 * IPFGMID - Indicates you have specified a message ID.
68 * IPNORPY - Indicates a one-way message. No reply expected.
69 * IPALL - Indicates that all paths are affected.
70 */
71#define IUCV_IPSRCCLS 0x01
72#define IUCV_IPTRGCLS 0x01
73#define IUCV_IPFGPID 0x02
74#define IUCV_IPFGMID 0x04
75#define IUCV_IPNORPY 0x10
76#define IUCV_IPALL 0x80
77
78static int iucv_bus_match(struct device *dev, struct device_driver *drv)
79{
80 return 0;
81}
82
83enum iucv_pm_states {
84 IUCV_PM_INITIAL = 0,
85 IUCV_PM_FREEZING = 1,
86 IUCV_PM_THAWING = 2,
87 IUCV_PM_RESTORING = 3,
88};
89static enum iucv_pm_states iucv_pm_state;
90
91static int iucv_pm_prepare(struct device *);
92static void iucv_pm_complete(struct device *);
93static int iucv_pm_freeze(struct device *);
94static int iucv_pm_thaw(struct device *);
95static int iucv_pm_restore(struct device *);
96
97static const struct dev_pm_ops iucv_pm_ops = {
98 .prepare = iucv_pm_prepare,
99 .complete = iucv_pm_complete,
100 .freeze = iucv_pm_freeze,
101 .thaw = iucv_pm_thaw,
102 .restore = iucv_pm_restore,
103};
104
105struct bus_type iucv_bus = {
106 .name = "iucv",
107 .match = iucv_bus_match,
108 .pm = &iucv_pm_ops,
109};
110EXPORT_SYMBOL(iucv_bus);
111
112struct device *iucv_root;
113EXPORT_SYMBOL(iucv_root);
114
115static int iucv_available;
116
117/* General IUCV interrupt structure */
118struct iucv_irq_data {
119 u16 ippathid;
120 u8 ipflags1;
121 u8 iptype;
122 u32 res2[8];
123};
124
125struct iucv_irq_list {
126 struct list_head list;
127 struct iucv_irq_data data;
128};
129
130static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
131static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
132static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
133
134/*
135 * Queue of interrupt buffers lock for delivery via the tasklet
136 * (fast but can't call smp_call_function).
137 */
138static LIST_HEAD(iucv_task_queue);
139
140/*
141 * The tasklet for fast delivery of iucv interrupts.
142 */
143static void iucv_tasklet_fn(unsigned long);
144static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
145
146/*
147 * Queue of interrupt buffers for delivery via a work queue
148 * (slower but can call smp_call_function).
149 */
150static LIST_HEAD(iucv_work_queue);
151
152/*
153 * The work element to deliver path pending interrupts.
154 */
155static void iucv_work_fn(struct work_struct *work);
156static DECLARE_WORK(iucv_work, iucv_work_fn);
157
158/*
159 * Spinlock protecting task and work queue.
160 */
161static DEFINE_SPINLOCK(iucv_queue_lock);
162
163enum iucv_command_codes {
164 IUCV_QUERY = 0,
165 IUCV_RETRIEVE_BUFFER = 2,
166 IUCV_SEND = 4,
167 IUCV_RECEIVE = 5,
168 IUCV_REPLY = 6,
169 IUCV_REJECT = 8,
170 IUCV_PURGE = 9,
171 IUCV_ACCEPT = 10,
172 IUCV_CONNECT = 11,
173 IUCV_DECLARE_BUFFER = 12,
174 IUCV_QUIESCE = 13,
175 IUCV_RESUME = 14,
176 IUCV_SEVER = 15,
177 IUCV_SETMASK = 16,
178 IUCV_SETCONTROLMASK = 17,
179};
180
181/*
182 * Error messages that are used with the iucv_sever function. They get
183 * converted to EBCDIC.
184 */
185static char iucv_error_no_listener[16] = "NO LISTENER";
186static char iucv_error_no_memory[16] = "NO MEMORY";
187static char iucv_error_pathid[16] = "INVALID PATHID";
188
189/*
190 * iucv_handler_list: List of registered handlers.
191 */
192static LIST_HEAD(iucv_handler_list);
193
194/*
195 * iucv_path_table: an array of iucv_path structures.
196 */
197static struct iucv_path **iucv_path_table;
198static unsigned long iucv_max_pathid;
199
200/*
201 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
202 */
203static DEFINE_SPINLOCK(iucv_table_lock);
204
205/*
206 * iucv_active_cpu: contains the number of the cpu executing the tasklet
207 * or the work handler. Needed for iucv_path_sever called from tasklet.
208 */
209static int iucv_active_cpu = -1;
210
211/*
212 * Mutex and wait queue for iucv_register/iucv_unregister.
213 */
214static DEFINE_MUTEX(iucv_register_mutex);
215
216/*
217 * Counter for number of non-smp capable handlers.
218 */
219static int iucv_nonsmp_handler;
220
221/*
222 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
223 * iucv_path_quiesce and iucv_path_sever.
224 */
225struct iucv_cmd_control {
226 u16 ippathid;
227 u8 ipflags1;
228 u8 iprcode;
229 u16 ipmsglim;
230 u16 res1;
231 u8 ipvmid[8];
232 u8 ipuser[16];
233 u8 iptarget[8];
234} __attribute__ ((packed,aligned(8)));
235
236/*
237 * Data in parameter list iucv structure. Used by iucv_message_send,
238 * iucv_message_send2way and iucv_message_reply.
239 */
240struct iucv_cmd_dpl {
241 u16 ippathid;
242 u8 ipflags1;
243 u8 iprcode;
244 u32 ipmsgid;
245 u32 iptrgcls;
246 u8 iprmmsg[8];
247 u32 ipsrccls;
248 u32 ipmsgtag;
249 u32 ipbfadr2;
250 u32 ipbfln2f;
251 u32 res;
252} __attribute__ ((packed,aligned(8)));
253
254/*
255 * Data in buffer iucv structure. Used by iucv_message_receive,
256 * iucv_message_reject, iucv_message_send, iucv_message_send2way
257 * and iucv_declare_cpu.
258 */
259struct iucv_cmd_db {
260 u16 ippathid;
261 u8 ipflags1;
262 u8 iprcode;
263 u32 ipmsgid;
264 u32 iptrgcls;
265 u32 ipbfadr1;
266 u32 ipbfln1f;
267 u32 ipsrccls;
268 u32 ipmsgtag;
269 u32 ipbfadr2;
270 u32 ipbfln2f;
271 u32 res;
272} __attribute__ ((packed,aligned(8)));
273
274/*
275 * Purge message iucv structure. Used by iucv_message_purge.
276 */
277struct iucv_cmd_purge {
278 u16 ippathid;
279 u8 ipflags1;
280 u8 iprcode;
281 u32 ipmsgid;
282 u8 ipaudit[3];
283 u8 res1[5];
284 u32 res2;
285 u32 ipsrccls;
286 u32 ipmsgtag;
287 u32 res3[3];
288} __attribute__ ((packed,aligned(8)));
289
290/*
291 * Set mask iucv structure. Used by iucv_enable_cpu.
292 */
293struct iucv_cmd_set_mask {
294 u8 ipmask;
295 u8 res1[2];
296 u8 iprcode;
297 u32 res2[9];
298} __attribute__ ((packed,aligned(8)));
299
300union iucv_param {
301 struct iucv_cmd_control ctrl;
302 struct iucv_cmd_dpl dpl;
303 struct iucv_cmd_db db;
304 struct iucv_cmd_purge purge;
305 struct iucv_cmd_set_mask set_mask;
306};
307
308/*
309 * Anchor for per-cpu IUCV command parameter block.
310 */
311static union iucv_param *iucv_param[NR_CPUS];
312static union iucv_param *iucv_param_irq[NR_CPUS];
313
314/**
315 * iucv_call_b2f0
316 * @code: identifier of IUCV call to CP.
317 * @parm: pointer to a struct iucv_parm block
318 *
319 * Calls CP to execute IUCV commands.
320 *
321 * Returns the result of the CP IUCV call.
322 */
323static inline int __iucv_call_b2f0(int command, union iucv_param *parm)
324{
325 register unsigned long reg0 asm ("0");
326 register unsigned long reg1 asm ("1");
327 int ccode;
328
329 reg0 = command;
330 reg1 = (unsigned long)parm;
331 asm volatile(
332 " .long 0xb2f01000\n"
333 " ipm %0\n"
334 " srl %0,28\n"
335 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
336 : "m" (*parm) : "cc");
337 return ccode;
338}
339
340static inline int iucv_call_b2f0(int command, union iucv_param *parm)
341{
342 int ccode;
343
344 ccode = __iucv_call_b2f0(command, parm);
345 return ccode == 1 ? parm->ctrl.iprcode : ccode;
346}
347
348/**
349 * iucv_query_maxconn
350 *
351 * Determines the maximum number of connections that may be established.
352 *
353 * Returns the maximum number of connections or -EPERM is IUCV is not
354 * available.
355 */
356static int __iucv_query_maxconn(void *param, unsigned long *max_pathid)
357{
358 register unsigned long reg0 asm ("0");
359 register unsigned long reg1 asm ("1");
360 int ccode;
361
362 reg0 = IUCV_QUERY;
363 reg1 = (unsigned long) param;
364 asm volatile (
365 " .long 0xb2f01000\n"
366 " ipm %0\n"
367 " srl %0,28\n"
368 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
369 *max_pathid = reg1;
370 return ccode;
371}
372
373static int iucv_query_maxconn(void)
374{
375 unsigned long max_pathid;
376 void *param;
377 int ccode;
378
379 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA);
380 if (!param)
381 return -ENOMEM;
382 ccode = __iucv_query_maxconn(param, &max_pathid);
383 if (ccode == 0)
384 iucv_max_pathid = max_pathid;
385 kfree(param);
386 return ccode ? -EPERM : 0;
387}
388
389/**
390 * iucv_allow_cpu
391 * @data: unused
392 *
393 * Allow iucv interrupts on this cpu.
394 */
395static void iucv_allow_cpu(void *data)
396{
397 int cpu = smp_processor_id();
398 union iucv_param *parm;
399
400 /*
401 * Enable all iucv interrupts.
402 * ipmask contains bits for the different interrupts
403 * 0x80 - Flag to allow nonpriority message pending interrupts
404 * 0x40 - Flag to allow priority message pending interrupts
405 * 0x20 - Flag to allow nonpriority message completion interrupts
406 * 0x10 - Flag to allow priority message completion interrupts
407 * 0x08 - Flag to allow IUCV control interrupts
408 */
409 parm = iucv_param_irq[cpu];
410 memset(parm, 0, sizeof(union iucv_param));
411 parm->set_mask.ipmask = 0xf8;
412 iucv_call_b2f0(IUCV_SETMASK, parm);
413
414 /*
415 * Enable all iucv control interrupts.
416 * ipmask contains bits for the different interrupts
417 * 0x80 - Flag to allow pending connections interrupts
418 * 0x40 - Flag to allow connection complete interrupts
419 * 0x20 - Flag to allow connection severed interrupts
420 * 0x10 - Flag to allow connection quiesced interrupts
421 * 0x08 - Flag to allow connection resumed interrupts
422 */
423 memset(parm, 0, sizeof(union iucv_param));
424 parm->set_mask.ipmask = 0xf8;
425 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
426 /* Set indication that iucv interrupts are allowed for this cpu. */
427 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
428}
429
430/**
431 * iucv_block_cpu
432 * @data: unused
433 *
434 * Block iucv interrupts on this cpu.
435 */
436static void iucv_block_cpu(void *data)
437{
438 int cpu = smp_processor_id();
439 union iucv_param *parm;
440
441 /* Disable all iucv interrupts. */
442 parm = iucv_param_irq[cpu];
443 memset(parm, 0, sizeof(union iucv_param));
444 iucv_call_b2f0(IUCV_SETMASK, parm);
445
446 /* Clear indication that iucv interrupts are allowed for this cpu. */
447 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
448}
449
450/**
451 * iucv_block_cpu_almost
452 * @data: unused
453 *
454 * Allow connection-severed interrupts only on this cpu.
455 */
456static void iucv_block_cpu_almost(void *data)
457{
458 int cpu = smp_processor_id();
459 union iucv_param *parm;
460
461 /* Allow iucv control interrupts only */
462 parm = iucv_param_irq[cpu];
463 memset(parm, 0, sizeof(union iucv_param));
464 parm->set_mask.ipmask = 0x08;
465 iucv_call_b2f0(IUCV_SETMASK, parm);
466 /* Allow iucv-severed interrupt only */
467 memset(parm, 0, sizeof(union iucv_param));
468 parm->set_mask.ipmask = 0x20;
469 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
470
471 /* Clear indication that iucv interrupts are allowed for this cpu. */
472 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
473}
474
475/**
476 * iucv_declare_cpu
477 * @data: unused
478 *
479 * Declare a interrupt buffer on this cpu.
480 */
481static void iucv_declare_cpu(void *data)
482{
483 int cpu = smp_processor_id();
484 union iucv_param *parm;
485 int rc;
486
487 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
488 return;
489
490 /* Declare interrupt buffer. */
491 parm = iucv_param_irq[cpu];
492 memset(parm, 0, sizeof(union iucv_param));
493 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
494 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
495 if (rc) {
496 char *err = "Unknown";
497 switch (rc) {
498 case 0x03:
499 err = "Directory error";
500 break;
501 case 0x0a:
502 err = "Invalid length";
503 break;
504 case 0x13:
505 err = "Buffer already exists";
506 break;
507 case 0x3e:
508 err = "Buffer overlap";
509 break;
510 case 0x5c:
511 err = "Paging or storage error";
512 break;
513 }
514 pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n",
515 cpu, rc, err);
516 return;
517 }
518
519 /* Set indication that an iucv buffer exists for this cpu. */
520 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
521
522 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
523 /* Enable iucv interrupts on this cpu. */
524 iucv_allow_cpu(NULL);
525 else
526 /* Disable iucv interrupts on this cpu. */
527 iucv_block_cpu(NULL);
528}
529
530/**
531 * iucv_retrieve_cpu
532 * @data: unused
533 *
534 * Retrieve interrupt buffer on this cpu.
535 */
536static void iucv_retrieve_cpu(void *data)
537{
538 int cpu = smp_processor_id();
539 union iucv_param *parm;
540
541 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
542 return;
543
544 /* Block iucv interrupts. */
545 iucv_block_cpu(NULL);
546
547 /* Retrieve interrupt buffer. */
548 parm = iucv_param_irq[cpu];
549 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
550
551 /* Clear indication that an iucv buffer exists for this cpu. */
552 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
553}
554
555/**
556 * iucv_setmask_smp
557 *
558 * Allow iucv interrupts on all cpus.
559 */
560static void iucv_setmask_mp(void)
561{
562 int cpu;
563
564 get_online_cpus();
565 for_each_online_cpu(cpu)
566 /* Enable all cpus with a declared buffer. */
567 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
568 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
569 smp_call_function_single(cpu, iucv_allow_cpu,
570 NULL, 1);
571 put_online_cpus();
572}
573
574/**
575 * iucv_setmask_up
576 *
577 * Allow iucv interrupts on a single cpu.
578 */
579static void iucv_setmask_up(void)
580{
581 cpumask_t cpumask;
582 int cpu;
583
584 /* Disable all cpu but the first in cpu_irq_cpumask. */
585 cpumask_copy(&cpumask, &iucv_irq_cpumask);
586 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
587 for_each_cpu(cpu, &cpumask)
588 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
589}
590
591/**
592 * iucv_enable
593 *
594 * This function makes iucv ready for use. It allocates the pathid
595 * table, declares an iucv interrupt buffer and enables the iucv
596 * interrupts. Called when the first user has registered an iucv
597 * handler.
598 */
599static int iucv_enable(void)
600{
601 size_t alloc_size;
602 int cpu, rc;
603
604 get_online_cpus();
605 rc = -ENOMEM;
606 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
607 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
608 if (!iucv_path_table)
609 goto out;
610 /* Declare per cpu buffers. */
611 rc = -EIO;
612 for_each_online_cpu(cpu)
613 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
614 if (cpumask_empty(&iucv_buffer_cpumask))
615 /* No cpu could declare an iucv buffer. */
616 goto out;
617 put_online_cpus();
618 return 0;
619out:
620 kfree(iucv_path_table);
621 iucv_path_table = NULL;
622 put_online_cpus();
623 return rc;
624}
625
626/**
627 * iucv_disable
628 *
629 * This function shuts down iucv. It disables iucv interrupts, retrieves
630 * the iucv interrupt buffer and frees the pathid table. Called after the
631 * last user unregister its iucv handler.
632 */
633static void iucv_disable(void)
634{
635 get_online_cpus();
636 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
637 kfree(iucv_path_table);
638 iucv_path_table = NULL;
639 put_online_cpus();
640}
641
642static int iucv_cpu_dead(unsigned int cpu)
643{
644 kfree(iucv_param_irq[cpu]);
645 iucv_param_irq[cpu] = NULL;
646 kfree(iucv_param[cpu]);
647 iucv_param[cpu] = NULL;
648 kfree(iucv_irq_data[cpu]);
649 iucv_irq_data[cpu] = NULL;
650 return 0;
651}
652
653static int iucv_cpu_prepare(unsigned int cpu)
654{
655 /* Note: GFP_DMA used to get memory below 2G */
656 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
657 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
658 if (!iucv_irq_data[cpu])
659 goto out_free;
660
661 /* Allocate parameter blocks. */
662 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
663 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
664 if (!iucv_param[cpu])
665 goto out_free;
666
667 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
668 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
669 if (!iucv_param_irq[cpu])
670 goto out_free;
671
672 return 0;
673
674out_free:
675 iucv_cpu_dead(cpu);
676 return -ENOMEM;
677}
678
679static int iucv_cpu_online(unsigned int cpu)
680{
681 if (!iucv_path_table)
682 return 0;
683 iucv_declare_cpu(NULL);
684 return 0;
685}
686
687static int iucv_cpu_down_prep(unsigned int cpu)
688{
689 cpumask_t cpumask;
690
691 if (!iucv_path_table)
692 return 0;
693
694 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
695 cpumask_clear_cpu(cpu, &cpumask);
696 if (cpumask_empty(&cpumask))
697 /* Can't offline last IUCV enabled cpu. */
698 return -EINVAL;
699
700 iucv_retrieve_cpu(NULL);
701 if (!cpumask_empty(&iucv_irq_cpumask))
702 return 0;
703 smp_call_function_single(cpumask_first(&iucv_buffer_cpumask),
704 iucv_allow_cpu, NULL, 1);
705 return 0;
706}
707
708/**
709 * iucv_sever_pathid
710 * @pathid: path identification number.
711 * @userdata: 16-bytes of user data.
712 *
713 * Sever an iucv path to free up the pathid. Used internally.
714 */
715static int iucv_sever_pathid(u16 pathid, u8 *userdata)
716{
717 union iucv_param *parm;
718
719 parm = iucv_param_irq[smp_processor_id()];
720 memset(parm, 0, sizeof(union iucv_param));
721 if (userdata)
722 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
723 parm->ctrl.ippathid = pathid;
724 return iucv_call_b2f0(IUCV_SEVER, parm);
725}
726
727/**
728 * __iucv_cleanup_queue
729 * @dummy: unused dummy argument
730 *
731 * Nop function called via smp_call_function to force work items from
732 * pending external iucv interrupts to the work queue.
733 */
734static void __iucv_cleanup_queue(void *dummy)
735{
736}
737
738/**
739 * iucv_cleanup_queue
740 *
741 * Function called after a path has been severed to find all remaining
742 * work items for the now stale pathid. The caller needs to hold the
743 * iucv_table_lock.
744 */
745static void iucv_cleanup_queue(void)
746{
747 struct iucv_irq_list *p, *n;
748
749 /*
750 * When a path is severed, the pathid can be reused immediately
751 * on a iucv connect or a connection pending interrupt. Remove
752 * all entries from the task queue that refer to a stale pathid
753 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
754 * or deliver the connection pending interrupt. To get all the
755 * pending interrupts force them to the work queue by calling
756 * an empty function on all cpus.
757 */
758 smp_call_function(__iucv_cleanup_queue, NULL, 1);
759 spin_lock_irq(&iucv_queue_lock);
760 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
761 /* Remove stale work items from the task queue. */
762 if (iucv_path_table[p->data.ippathid] == NULL) {
763 list_del(&p->list);
764 kfree(p);
765 }
766 }
767 spin_unlock_irq(&iucv_queue_lock);
768}
769
770/**
771 * iucv_register:
772 * @handler: address of iucv handler structure
773 * @smp: != 0 indicates that the handler can deal with out of order messages
774 *
775 * Registers a driver with IUCV.
776 *
777 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
778 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
779 */
780int iucv_register(struct iucv_handler *handler, int smp)
781{
782 int rc;
783
784 if (!iucv_available)
785 return -ENOSYS;
786 mutex_lock(&iucv_register_mutex);
787 if (!smp)
788 iucv_nonsmp_handler++;
789 if (list_empty(&iucv_handler_list)) {
790 rc = iucv_enable();
791 if (rc)
792 goto out_mutex;
793 } else if (!smp && iucv_nonsmp_handler == 1)
794 iucv_setmask_up();
795 INIT_LIST_HEAD(&handler->paths);
796
797 spin_lock_bh(&iucv_table_lock);
798 list_add_tail(&handler->list, &iucv_handler_list);
799 spin_unlock_bh(&iucv_table_lock);
800 rc = 0;
801out_mutex:
802 mutex_unlock(&iucv_register_mutex);
803 return rc;
804}
805EXPORT_SYMBOL(iucv_register);
806
807/**
808 * iucv_unregister
809 * @handler: address of iucv handler structure
810 * @smp: != 0 indicates that the handler can deal with out of order messages
811 *
812 * Unregister driver from IUCV.
813 */
814void iucv_unregister(struct iucv_handler *handler, int smp)
815{
816 struct iucv_path *p, *n;
817
818 mutex_lock(&iucv_register_mutex);
819 spin_lock_bh(&iucv_table_lock);
820 /* Remove handler from the iucv_handler_list. */
821 list_del_init(&handler->list);
822 /* Sever all pathids still referring to the handler. */
823 list_for_each_entry_safe(p, n, &handler->paths, list) {
824 iucv_sever_pathid(p->pathid, NULL);
825 iucv_path_table[p->pathid] = NULL;
826 list_del(&p->list);
827 iucv_path_free(p);
828 }
829 spin_unlock_bh(&iucv_table_lock);
830 if (!smp)
831 iucv_nonsmp_handler--;
832 if (list_empty(&iucv_handler_list))
833 iucv_disable();
834 else if (!smp && iucv_nonsmp_handler == 0)
835 iucv_setmask_mp();
836 mutex_unlock(&iucv_register_mutex);
837}
838EXPORT_SYMBOL(iucv_unregister);
839
840static int iucv_reboot_event(struct notifier_block *this,
841 unsigned long event, void *ptr)
842{
843 int i;
844
845 if (cpumask_empty(&iucv_irq_cpumask))
846 return NOTIFY_DONE;
847
848 get_online_cpus();
849 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
850 preempt_disable();
851 for (i = 0; i < iucv_max_pathid; i++) {
852 if (iucv_path_table[i])
853 iucv_sever_pathid(i, NULL);
854 }
855 preempt_enable();
856 put_online_cpus();
857 iucv_disable();
858 return NOTIFY_DONE;
859}
860
861static struct notifier_block iucv_reboot_notifier = {
862 .notifier_call = iucv_reboot_event,
863};
864
865/**
866 * iucv_path_accept
867 * @path: address of iucv path structure
868 * @handler: address of iucv handler structure
869 * @userdata: 16 bytes of data reflected to the communication partner
870 * @private: private data passed to interrupt handlers for this path
871 *
872 * This function is issued after the user received a connection pending
873 * external interrupt and now wishes to complete the IUCV communication path.
874 *
875 * Returns the result of the CP IUCV call.
876 */
877int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
878 u8 *userdata, void *private)
879{
880 union iucv_param *parm;
881 int rc;
882
883 local_bh_disable();
884 if (cpumask_empty(&iucv_buffer_cpumask)) {
885 rc = -EIO;
886 goto out;
887 }
888 /* Prepare parameter block. */
889 parm = iucv_param[smp_processor_id()];
890 memset(parm, 0, sizeof(union iucv_param));
891 parm->ctrl.ippathid = path->pathid;
892 parm->ctrl.ipmsglim = path->msglim;
893 if (userdata)
894 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
895 parm->ctrl.ipflags1 = path->flags;
896
897 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
898 if (!rc) {
899 path->private = private;
900 path->msglim = parm->ctrl.ipmsglim;
901 path->flags = parm->ctrl.ipflags1;
902 }
903out:
904 local_bh_enable();
905 return rc;
906}
907EXPORT_SYMBOL(iucv_path_accept);
908
909/**
910 * iucv_path_connect
911 * @path: address of iucv path structure
912 * @handler: address of iucv handler structure
913 * @userid: 8-byte user identification
914 * @system: 8-byte target system identification
915 * @userdata: 16 bytes of data reflected to the communication partner
916 * @private: private data passed to interrupt handlers for this path
917 *
918 * This function establishes an IUCV path. Although the connect may complete
919 * successfully, you are not able to use the path until you receive an IUCV
920 * Connection Complete external interrupt.
921 *
922 * Returns the result of the CP IUCV call.
923 */
924int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
925 u8 *userid, u8 *system, u8 *userdata,
926 void *private)
927{
928 union iucv_param *parm;
929 int rc;
930
931 spin_lock_bh(&iucv_table_lock);
932 iucv_cleanup_queue();
933 if (cpumask_empty(&iucv_buffer_cpumask)) {
934 rc = -EIO;
935 goto out;
936 }
937 parm = iucv_param[smp_processor_id()];
938 memset(parm, 0, sizeof(union iucv_param));
939 parm->ctrl.ipmsglim = path->msglim;
940 parm->ctrl.ipflags1 = path->flags;
941 if (userid) {
942 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
943 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
944 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
945 }
946 if (system) {
947 memcpy(parm->ctrl.iptarget, system,
948 sizeof(parm->ctrl.iptarget));
949 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
950 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
951 }
952 if (userdata)
953 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
954
955 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
956 if (!rc) {
957 if (parm->ctrl.ippathid < iucv_max_pathid) {
958 path->pathid = parm->ctrl.ippathid;
959 path->msglim = parm->ctrl.ipmsglim;
960 path->flags = parm->ctrl.ipflags1;
961 path->handler = handler;
962 path->private = private;
963 list_add_tail(&path->list, &handler->paths);
964 iucv_path_table[path->pathid] = path;
965 } else {
966 iucv_sever_pathid(parm->ctrl.ippathid,
967 iucv_error_pathid);
968 rc = -EIO;
969 }
970 }
971out:
972 spin_unlock_bh(&iucv_table_lock);
973 return rc;
974}
975EXPORT_SYMBOL(iucv_path_connect);
976
977/**
978 * iucv_path_quiesce:
979 * @path: address of iucv path structure
980 * @userdata: 16 bytes of data reflected to the communication partner
981 *
982 * This function temporarily suspends incoming messages on an IUCV path.
983 * You can later reactivate the path by invoking the iucv_resume function.
984 *
985 * Returns the result from the CP IUCV call.
986 */
987int iucv_path_quiesce(struct iucv_path *path, u8 *userdata)
988{
989 union iucv_param *parm;
990 int rc;
991
992 local_bh_disable();
993 if (cpumask_empty(&iucv_buffer_cpumask)) {
994 rc = -EIO;
995 goto out;
996 }
997 parm = iucv_param[smp_processor_id()];
998 memset(parm, 0, sizeof(union iucv_param));
999 if (userdata)
1000 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1001 parm->ctrl.ippathid = path->pathid;
1002 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
1003out:
1004 local_bh_enable();
1005 return rc;
1006}
1007EXPORT_SYMBOL(iucv_path_quiesce);
1008
1009/**
1010 * iucv_path_resume:
1011 * @path: address of iucv path structure
1012 * @userdata: 16 bytes of data reflected to the communication partner
1013 *
1014 * This function resumes incoming messages on an IUCV path that has
1015 * been stopped with iucv_path_quiesce.
1016 *
1017 * Returns the result from the CP IUCV call.
1018 */
1019int iucv_path_resume(struct iucv_path *path, u8 *userdata)
1020{
1021 union iucv_param *parm;
1022 int rc;
1023
1024 local_bh_disable();
1025 if (cpumask_empty(&iucv_buffer_cpumask)) {
1026 rc = -EIO;
1027 goto out;
1028 }
1029 parm = iucv_param[smp_processor_id()];
1030 memset(parm, 0, sizeof(union iucv_param));
1031 if (userdata)
1032 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1033 parm->ctrl.ippathid = path->pathid;
1034 rc = iucv_call_b2f0(IUCV_RESUME, parm);
1035out:
1036 local_bh_enable();
1037 return rc;
1038}
1039
1040/**
1041 * iucv_path_sever
1042 * @path: address of iucv path structure
1043 * @userdata: 16 bytes of data reflected to the communication partner
1044 *
1045 * This function terminates an IUCV path.
1046 *
1047 * Returns the result from the CP IUCV call.
1048 */
1049int iucv_path_sever(struct iucv_path *path, u8 *userdata)
1050{
1051 int rc;
1052
1053 preempt_disable();
1054 if (cpumask_empty(&iucv_buffer_cpumask)) {
1055 rc = -EIO;
1056 goto out;
1057 }
1058 if (iucv_active_cpu != smp_processor_id())
1059 spin_lock_bh(&iucv_table_lock);
1060 rc = iucv_sever_pathid(path->pathid, userdata);
1061 iucv_path_table[path->pathid] = NULL;
1062 list_del_init(&path->list);
1063 if (iucv_active_cpu != smp_processor_id())
1064 spin_unlock_bh(&iucv_table_lock);
1065out:
1066 preempt_enable();
1067 return rc;
1068}
1069EXPORT_SYMBOL(iucv_path_sever);
1070
1071/**
1072 * iucv_message_purge
1073 * @path: address of iucv path structure
1074 * @msg: address of iucv msg structure
1075 * @srccls: source class of message
1076 *
1077 * Cancels a message you have sent.
1078 *
1079 * Returns the result from the CP IUCV call.
1080 */
1081int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1082 u32 srccls)
1083{
1084 union iucv_param *parm;
1085 int rc;
1086
1087 local_bh_disable();
1088 if (cpumask_empty(&iucv_buffer_cpumask)) {
1089 rc = -EIO;
1090 goto out;
1091 }
1092 parm = iucv_param[smp_processor_id()];
1093 memset(parm, 0, sizeof(union iucv_param));
1094 parm->purge.ippathid = path->pathid;
1095 parm->purge.ipmsgid = msg->id;
1096 parm->purge.ipsrccls = srccls;
1097 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1098 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1099 if (!rc) {
1100 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1101 msg->tag = parm->purge.ipmsgtag;
1102 }
1103out:
1104 local_bh_enable();
1105 return rc;
1106}
1107EXPORT_SYMBOL(iucv_message_purge);
1108
1109/**
1110 * iucv_message_receive_iprmdata
1111 * @path: address of iucv path structure
1112 * @msg: address of iucv msg structure
1113 * @flags: how the message is received (IUCV_IPBUFLST)
1114 * @buffer: address of data buffer or address of struct iucv_array
1115 * @size: length of data buffer
1116 * @residual:
1117 *
1118 * Internal function used by iucv_message_receive and __iucv_message_receive
1119 * to receive RMDATA data stored in struct iucv_message.
1120 */
1121static int iucv_message_receive_iprmdata(struct iucv_path *path,
1122 struct iucv_message *msg,
1123 u8 flags, void *buffer,
1124 size_t size, size_t *residual)
1125{
1126 struct iucv_array *array;
1127 u8 *rmmsg;
1128 size_t copy;
1129
1130 /*
1131 * Message is 8 bytes long and has been stored to the
1132 * message descriptor itself.
1133 */
1134 if (residual)
1135 *residual = abs(size - 8);
1136 rmmsg = msg->rmmsg;
1137 if (flags & IUCV_IPBUFLST) {
1138 /* Copy to struct iucv_array. */
1139 size = (size < 8) ? size : 8;
1140 for (array = buffer; size > 0; array++) {
1141 copy = min_t(size_t, size, array->length);
1142 memcpy((u8 *)(addr_t) array->address,
1143 rmmsg, copy);
1144 rmmsg += copy;
1145 size -= copy;
1146 }
1147 } else {
1148 /* Copy to direct buffer. */
1149 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1150 }
1151 return 0;
1152}
1153
1154/**
1155 * __iucv_message_receive
1156 * @path: address of iucv path structure
1157 * @msg: address of iucv msg structure
1158 * @flags: how the message is received (IUCV_IPBUFLST)
1159 * @buffer: address of data buffer or address of struct iucv_array
1160 * @size: length of data buffer
1161 * @residual:
1162 *
1163 * This function receives messages that are being sent to you over
1164 * established paths. This function will deal with RMDATA messages
1165 * embedded in struct iucv_message as well.
1166 *
1167 * Locking: no locking
1168 *
1169 * Returns the result from the CP IUCV call.
1170 */
1171int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1172 u8 flags, void *buffer, size_t size, size_t *residual)
1173{
1174 union iucv_param *parm;
1175 int rc;
1176
1177 if (msg->flags & IUCV_IPRMDATA)
1178 return iucv_message_receive_iprmdata(path, msg, flags,
1179 buffer, size, residual);
1180 if (cpumask_empty(&iucv_buffer_cpumask)) {
1181 rc = -EIO;
1182 goto out;
1183 }
1184 parm = iucv_param[smp_processor_id()];
1185 memset(parm, 0, sizeof(union iucv_param));
1186 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1187 parm->db.ipbfln1f = (u32) size;
1188 parm->db.ipmsgid = msg->id;
1189 parm->db.ippathid = path->pathid;
1190 parm->db.iptrgcls = msg->class;
1191 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1192 IUCV_IPFGMID | IUCV_IPTRGCLS);
1193 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1194 if (!rc || rc == 5) {
1195 msg->flags = parm->db.ipflags1;
1196 if (residual)
1197 *residual = parm->db.ipbfln1f;
1198 }
1199out:
1200 return rc;
1201}
1202EXPORT_SYMBOL(__iucv_message_receive);
1203
1204/**
1205 * iucv_message_receive
1206 * @path: address of iucv path structure
1207 * @msg: address of iucv msg structure
1208 * @flags: how the message is received (IUCV_IPBUFLST)
1209 * @buffer: address of data buffer or address of struct iucv_array
1210 * @size: length of data buffer
1211 * @residual:
1212 *
1213 * This function receives messages that are being sent to you over
1214 * established paths. This function will deal with RMDATA messages
1215 * embedded in struct iucv_message as well.
1216 *
1217 * Locking: local_bh_enable/local_bh_disable
1218 *
1219 * Returns the result from the CP IUCV call.
1220 */
1221int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1222 u8 flags, void *buffer, size_t size, size_t *residual)
1223{
1224 int rc;
1225
1226 if (msg->flags & IUCV_IPRMDATA)
1227 return iucv_message_receive_iprmdata(path, msg, flags,
1228 buffer, size, residual);
1229 local_bh_disable();
1230 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
1231 local_bh_enable();
1232 return rc;
1233}
1234EXPORT_SYMBOL(iucv_message_receive);
1235
1236/**
1237 * iucv_message_reject
1238 * @path: address of iucv path structure
1239 * @msg: address of iucv msg structure
1240 *
1241 * The reject function refuses a specified message. Between the time you
1242 * are notified of a message and the time that you complete the message,
1243 * the message may be rejected.
1244 *
1245 * Returns the result from the CP IUCV call.
1246 */
1247int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1248{
1249 union iucv_param *parm;
1250 int rc;
1251
1252 local_bh_disable();
1253 if (cpumask_empty(&iucv_buffer_cpumask)) {
1254 rc = -EIO;
1255 goto out;
1256 }
1257 parm = iucv_param[smp_processor_id()];
1258 memset(parm, 0, sizeof(union iucv_param));
1259 parm->db.ippathid = path->pathid;
1260 parm->db.ipmsgid = msg->id;
1261 parm->db.iptrgcls = msg->class;
1262 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1263 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1264out:
1265 local_bh_enable();
1266 return rc;
1267}
1268EXPORT_SYMBOL(iucv_message_reject);
1269
1270/**
1271 * iucv_message_reply
1272 * @path: address of iucv path structure
1273 * @msg: address of iucv msg structure
1274 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1275 * @reply: address of reply data buffer or address of struct iucv_array
1276 * @size: length of reply data buffer
1277 *
1278 * This function responds to the two-way messages that you receive. You
1279 * must identify completely the message to which you wish to reply. ie,
1280 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1281 * the parameter list.
1282 *
1283 * Returns the result from the CP IUCV call.
1284 */
1285int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1286 u8 flags, void *reply, size_t size)
1287{
1288 union iucv_param *parm;
1289 int rc;
1290
1291 local_bh_disable();
1292 if (cpumask_empty(&iucv_buffer_cpumask)) {
1293 rc = -EIO;
1294 goto out;
1295 }
1296 parm = iucv_param[smp_processor_id()];
1297 memset(parm, 0, sizeof(union iucv_param));
1298 if (flags & IUCV_IPRMDATA) {
1299 parm->dpl.ippathid = path->pathid;
1300 parm->dpl.ipflags1 = flags;
1301 parm->dpl.ipmsgid = msg->id;
1302 parm->dpl.iptrgcls = msg->class;
1303 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1304 } else {
1305 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1306 parm->db.ipbfln1f = (u32) size;
1307 parm->db.ippathid = path->pathid;
1308 parm->db.ipflags1 = flags;
1309 parm->db.ipmsgid = msg->id;
1310 parm->db.iptrgcls = msg->class;
1311 }
1312 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1313out:
1314 local_bh_enable();
1315 return rc;
1316}
1317EXPORT_SYMBOL(iucv_message_reply);
1318
1319/**
1320 * __iucv_message_send
1321 * @path: address of iucv path structure
1322 * @msg: address of iucv msg structure
1323 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1324 * @srccls: source class of message
1325 * @buffer: address of send buffer or address of struct iucv_array
1326 * @size: length of send buffer
1327 *
1328 * This function transmits data to another application. Data to be
1329 * transmitted is in a buffer and this is a one-way message and the
1330 * receiver will not reply to the message.
1331 *
1332 * Locking: no locking
1333 *
1334 * Returns the result from the CP IUCV call.
1335 */
1336int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1337 u8 flags, u32 srccls, void *buffer, size_t size)
1338{
1339 union iucv_param *parm;
1340 int rc;
1341
1342 if (cpumask_empty(&iucv_buffer_cpumask)) {
1343 rc = -EIO;
1344 goto out;
1345 }
1346 parm = iucv_param[smp_processor_id()];
1347 memset(parm, 0, sizeof(union iucv_param));
1348 if (flags & IUCV_IPRMDATA) {
1349 /* Message of 8 bytes can be placed into the parameter list. */
1350 parm->dpl.ippathid = path->pathid;
1351 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1352 parm->dpl.iptrgcls = msg->class;
1353 parm->dpl.ipsrccls = srccls;
1354 parm->dpl.ipmsgtag = msg->tag;
1355 memcpy(parm->dpl.iprmmsg, buffer, 8);
1356 } else {
1357 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1358 parm->db.ipbfln1f = (u32) size;
1359 parm->db.ippathid = path->pathid;
1360 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1361 parm->db.iptrgcls = msg->class;
1362 parm->db.ipsrccls = srccls;
1363 parm->db.ipmsgtag = msg->tag;
1364 }
1365 rc = iucv_call_b2f0(IUCV_SEND, parm);
1366 if (!rc)
1367 msg->id = parm->db.ipmsgid;
1368out:
1369 return rc;
1370}
1371EXPORT_SYMBOL(__iucv_message_send);
1372
1373/**
1374 * iucv_message_send
1375 * @path: address of iucv path structure
1376 * @msg: address of iucv msg structure
1377 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1378 * @srccls: source class of message
1379 * @buffer: address of send buffer or address of struct iucv_array
1380 * @size: length of send buffer
1381 *
1382 * This function transmits data to another application. Data to be
1383 * transmitted is in a buffer and this is a one-way message and the
1384 * receiver will not reply to the message.
1385 *
1386 * Locking: local_bh_enable/local_bh_disable
1387 *
1388 * Returns the result from the CP IUCV call.
1389 */
1390int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1391 u8 flags, u32 srccls, void *buffer, size_t size)
1392{
1393 int rc;
1394
1395 local_bh_disable();
1396 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
1397 local_bh_enable();
1398 return rc;
1399}
1400EXPORT_SYMBOL(iucv_message_send);
1401
1402/**
1403 * iucv_message_send2way
1404 * @path: address of iucv path structure
1405 * @msg: address of iucv msg structure
1406 * @flags: how the message is sent and the reply is received
1407 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1408 * @srccls: source class of message
1409 * @buffer: address of send buffer or address of struct iucv_array
1410 * @size: length of send buffer
1411 * @ansbuf: address of answer buffer or address of struct iucv_array
1412 * @asize: size of reply buffer
1413 *
1414 * This function transmits data to another application. Data to be
1415 * transmitted is in a buffer. The receiver of the send is expected to
1416 * reply to the message and a buffer is provided into which IUCV moves
1417 * the reply to this message.
1418 *
1419 * Returns the result from the CP IUCV call.
1420 */
1421int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1422 u8 flags, u32 srccls, void *buffer, size_t size,
1423 void *answer, size_t asize, size_t *residual)
1424{
1425 union iucv_param *parm;
1426 int rc;
1427
1428 local_bh_disable();
1429 if (cpumask_empty(&iucv_buffer_cpumask)) {
1430 rc = -EIO;
1431 goto out;
1432 }
1433 parm = iucv_param[smp_processor_id()];
1434 memset(parm, 0, sizeof(union iucv_param));
1435 if (flags & IUCV_IPRMDATA) {
1436 parm->dpl.ippathid = path->pathid;
1437 parm->dpl.ipflags1 = path->flags; /* priority message */
1438 parm->dpl.iptrgcls = msg->class;
1439 parm->dpl.ipsrccls = srccls;
1440 parm->dpl.ipmsgtag = msg->tag;
1441 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1442 parm->dpl.ipbfln2f = (u32) asize;
1443 memcpy(parm->dpl.iprmmsg, buffer, 8);
1444 } else {
1445 parm->db.ippathid = path->pathid;
1446 parm->db.ipflags1 = path->flags; /* priority message */
1447 parm->db.iptrgcls = msg->class;
1448 parm->db.ipsrccls = srccls;
1449 parm->db.ipmsgtag = msg->tag;
1450 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1451 parm->db.ipbfln1f = (u32) size;
1452 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1453 parm->db.ipbfln2f = (u32) asize;
1454 }
1455 rc = iucv_call_b2f0(IUCV_SEND, parm);
1456 if (!rc)
1457 msg->id = parm->db.ipmsgid;
1458out:
1459 local_bh_enable();
1460 return rc;
1461}
1462EXPORT_SYMBOL(iucv_message_send2way);
1463
1464/**
1465 * iucv_path_pending
1466 * @data: Pointer to external interrupt buffer
1467 *
1468 * Process connection pending work item. Called from tasklet while holding
1469 * iucv_table_lock.
1470 */
1471struct iucv_path_pending {
1472 u16 ippathid;
1473 u8 ipflags1;
1474 u8 iptype;
1475 u16 ipmsglim;
1476 u16 res1;
1477 u8 ipvmid[8];
1478 u8 ipuser[16];
1479 u32 res3;
1480 u8 ippollfg;
1481 u8 res4[3];
1482} __packed;
1483
1484static void iucv_path_pending(struct iucv_irq_data *data)
1485{
1486 struct iucv_path_pending *ipp = (void *) data;
1487 struct iucv_handler *handler;
1488 struct iucv_path *path;
1489 char *error;
1490
1491 BUG_ON(iucv_path_table[ipp->ippathid]);
1492 /* New pathid, handler found. Create a new path struct. */
1493 error = iucv_error_no_memory;
1494 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1495 if (!path)
1496 goto out_sever;
1497 path->pathid = ipp->ippathid;
1498 iucv_path_table[path->pathid] = path;
1499 EBCASC(ipp->ipvmid, 8);
1500
1501 /* Call registered handler until one is found that wants the path. */
1502 list_for_each_entry(handler, &iucv_handler_list, list) {
1503 if (!handler->path_pending)
1504 continue;
1505 /*
1506 * Add path to handler to allow a call to iucv_path_sever
1507 * inside the path_pending function. If the handler returns
1508 * an error remove the path from the handler again.
1509 */
1510 list_add(&path->list, &handler->paths);
1511 path->handler = handler;
1512 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1513 return;
1514 list_del(&path->list);
1515 path->handler = NULL;
1516 }
1517 /* No handler wanted the path. */
1518 iucv_path_table[path->pathid] = NULL;
1519 iucv_path_free(path);
1520 error = iucv_error_no_listener;
1521out_sever:
1522 iucv_sever_pathid(ipp->ippathid, error);
1523}
1524
1525/**
1526 * iucv_path_complete
1527 * @data: Pointer to external interrupt buffer
1528 *
1529 * Process connection complete work item. Called from tasklet while holding
1530 * iucv_table_lock.
1531 */
1532struct iucv_path_complete {
1533 u16 ippathid;
1534 u8 ipflags1;
1535 u8 iptype;
1536 u16 ipmsglim;
1537 u16 res1;
1538 u8 res2[8];
1539 u8 ipuser[16];
1540 u32 res3;
1541 u8 ippollfg;
1542 u8 res4[3];
1543} __packed;
1544
1545static void iucv_path_complete(struct iucv_irq_data *data)
1546{
1547 struct iucv_path_complete *ipc = (void *) data;
1548 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1549
1550 if (path)
1551 path->flags = ipc->ipflags1;
1552 if (path && path->handler && path->handler->path_complete)
1553 path->handler->path_complete(path, ipc->ipuser);
1554}
1555
1556/**
1557 * iucv_path_severed
1558 * @data: Pointer to external interrupt buffer
1559 *
1560 * Process connection severed work item. Called from tasklet while holding
1561 * iucv_table_lock.
1562 */
1563struct iucv_path_severed {
1564 u16 ippathid;
1565 u8 res1;
1566 u8 iptype;
1567 u32 res2;
1568 u8 res3[8];
1569 u8 ipuser[16];
1570 u32 res4;
1571 u8 ippollfg;
1572 u8 res5[3];
1573} __packed;
1574
1575static void iucv_path_severed(struct iucv_irq_data *data)
1576{
1577 struct iucv_path_severed *ips = (void *) data;
1578 struct iucv_path *path = iucv_path_table[ips->ippathid];
1579
1580 if (!path || !path->handler) /* Already severed */
1581 return;
1582 if (path->handler->path_severed)
1583 path->handler->path_severed(path, ips->ipuser);
1584 else {
1585 iucv_sever_pathid(path->pathid, NULL);
1586 iucv_path_table[path->pathid] = NULL;
1587 list_del(&path->list);
1588 iucv_path_free(path);
1589 }
1590}
1591
1592/**
1593 * iucv_path_quiesced
1594 * @data: Pointer to external interrupt buffer
1595 *
1596 * Process connection quiesced work item. Called from tasklet while holding
1597 * iucv_table_lock.
1598 */
1599struct iucv_path_quiesced {
1600 u16 ippathid;
1601 u8 res1;
1602 u8 iptype;
1603 u32 res2;
1604 u8 res3[8];
1605 u8 ipuser[16];
1606 u32 res4;
1607 u8 ippollfg;
1608 u8 res5[3];
1609} __packed;
1610
1611static void iucv_path_quiesced(struct iucv_irq_data *data)
1612{
1613 struct iucv_path_quiesced *ipq = (void *) data;
1614 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1615
1616 if (path && path->handler && path->handler->path_quiesced)
1617 path->handler->path_quiesced(path, ipq->ipuser);
1618}
1619
1620/**
1621 * iucv_path_resumed
1622 * @data: Pointer to external interrupt buffer
1623 *
1624 * Process connection resumed work item. Called from tasklet while holding
1625 * iucv_table_lock.
1626 */
1627struct iucv_path_resumed {
1628 u16 ippathid;
1629 u8 res1;
1630 u8 iptype;
1631 u32 res2;
1632 u8 res3[8];
1633 u8 ipuser[16];
1634 u32 res4;
1635 u8 ippollfg;
1636 u8 res5[3];
1637} __packed;
1638
1639static void iucv_path_resumed(struct iucv_irq_data *data)
1640{
1641 struct iucv_path_resumed *ipr = (void *) data;
1642 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1643
1644 if (path && path->handler && path->handler->path_resumed)
1645 path->handler->path_resumed(path, ipr->ipuser);
1646}
1647
1648/**
1649 * iucv_message_complete
1650 * @data: Pointer to external interrupt buffer
1651 *
1652 * Process message complete work item. Called from tasklet while holding
1653 * iucv_table_lock.
1654 */
1655struct iucv_message_complete {
1656 u16 ippathid;
1657 u8 ipflags1;
1658 u8 iptype;
1659 u32 ipmsgid;
1660 u32 ipaudit;
1661 u8 iprmmsg[8];
1662 u32 ipsrccls;
1663 u32 ipmsgtag;
1664 u32 res;
1665 u32 ipbfln2f;
1666 u8 ippollfg;
1667 u8 res2[3];
1668} __packed;
1669
1670static void iucv_message_complete(struct iucv_irq_data *data)
1671{
1672 struct iucv_message_complete *imc = (void *) data;
1673 struct iucv_path *path = iucv_path_table[imc->ippathid];
1674 struct iucv_message msg;
1675
1676 if (path && path->handler && path->handler->message_complete) {
1677 msg.flags = imc->ipflags1;
1678 msg.id = imc->ipmsgid;
1679 msg.audit = imc->ipaudit;
1680 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1681 msg.class = imc->ipsrccls;
1682 msg.tag = imc->ipmsgtag;
1683 msg.length = imc->ipbfln2f;
1684 path->handler->message_complete(path, &msg);
1685 }
1686}
1687
1688/**
1689 * iucv_message_pending
1690 * @data: Pointer to external interrupt buffer
1691 *
1692 * Process message pending work item. Called from tasklet while holding
1693 * iucv_table_lock.
1694 */
1695struct iucv_message_pending {
1696 u16 ippathid;
1697 u8 ipflags1;
1698 u8 iptype;
1699 u32 ipmsgid;
1700 u32 iptrgcls;
1701 union {
1702 u32 iprmmsg1_u32;
1703 u8 iprmmsg1[4];
1704 } ln1msg1;
1705 union {
1706 u32 ipbfln1f;
1707 u8 iprmmsg2[4];
1708 } ln1msg2;
1709 u32 res1[3];
1710 u32 ipbfln2f;
1711 u8 ippollfg;
1712 u8 res2[3];
1713} __packed;
1714
1715static void iucv_message_pending(struct iucv_irq_data *data)
1716{
1717 struct iucv_message_pending *imp = (void *) data;
1718 struct iucv_path *path = iucv_path_table[imp->ippathid];
1719 struct iucv_message msg;
1720
1721 if (path && path->handler && path->handler->message_pending) {
1722 msg.flags = imp->ipflags1;
1723 msg.id = imp->ipmsgid;
1724 msg.class = imp->iptrgcls;
1725 if (imp->ipflags1 & IUCV_IPRMDATA) {
1726 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1727 msg.length = 8;
1728 } else
1729 msg.length = imp->ln1msg2.ipbfln1f;
1730 msg.reply_size = imp->ipbfln2f;
1731 path->handler->message_pending(path, &msg);
1732 }
1733}
1734
1735/**
1736 * iucv_tasklet_fn:
1737 *
1738 * This tasklet loops over the queue of irq buffers created by
1739 * iucv_external_interrupt, calls the appropriate action handler
1740 * and then frees the buffer.
1741 */
1742static void iucv_tasklet_fn(unsigned long ignored)
1743{
1744 typedef void iucv_irq_fn(struct iucv_irq_data *);
1745 static iucv_irq_fn *irq_fn[] = {
1746 [0x02] = iucv_path_complete,
1747 [0x03] = iucv_path_severed,
1748 [0x04] = iucv_path_quiesced,
1749 [0x05] = iucv_path_resumed,
1750 [0x06] = iucv_message_complete,
1751 [0x07] = iucv_message_complete,
1752 [0x08] = iucv_message_pending,
1753 [0x09] = iucv_message_pending,
1754 };
1755 LIST_HEAD(task_queue);
1756 struct iucv_irq_list *p, *n;
1757
1758 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1759 if (!spin_trylock(&iucv_table_lock)) {
1760 tasklet_schedule(&iucv_tasklet);
1761 return;
1762 }
1763 iucv_active_cpu = smp_processor_id();
1764
1765 spin_lock_irq(&iucv_queue_lock);
1766 list_splice_init(&iucv_task_queue, &task_queue);
1767 spin_unlock_irq(&iucv_queue_lock);
1768
1769 list_for_each_entry_safe(p, n, &task_queue, list) {
1770 list_del_init(&p->list);
1771 irq_fn[p->data.iptype](&p->data);
1772 kfree(p);
1773 }
1774
1775 iucv_active_cpu = -1;
1776 spin_unlock(&iucv_table_lock);
1777}
1778
1779/**
1780 * iucv_work_fn:
1781 *
1782 * This work function loops over the queue of path pending irq blocks
1783 * created by iucv_external_interrupt, calls the appropriate action
1784 * handler and then frees the buffer.
1785 */
1786static void iucv_work_fn(struct work_struct *work)
1787{
1788 LIST_HEAD(work_queue);
1789 struct iucv_irq_list *p, *n;
1790
1791 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1792 spin_lock_bh(&iucv_table_lock);
1793 iucv_active_cpu = smp_processor_id();
1794
1795 spin_lock_irq(&iucv_queue_lock);
1796 list_splice_init(&iucv_work_queue, &work_queue);
1797 spin_unlock_irq(&iucv_queue_lock);
1798
1799 iucv_cleanup_queue();
1800 list_for_each_entry_safe(p, n, &work_queue, list) {
1801 list_del_init(&p->list);
1802 iucv_path_pending(&p->data);
1803 kfree(p);
1804 }
1805
1806 iucv_active_cpu = -1;
1807 spin_unlock_bh(&iucv_table_lock);
1808}
1809
1810/**
1811 * iucv_external_interrupt
1812 * @code: irq code
1813 *
1814 * Handles external interrupts coming in from CP.
1815 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
1816 */
1817static void iucv_external_interrupt(struct ext_code ext_code,
1818 unsigned int param32, unsigned long param64)
1819{
1820 struct iucv_irq_data *p;
1821 struct iucv_irq_list *work;
1822
1823 inc_irq_stat(IRQEXT_IUC);
1824 p = iucv_irq_data[smp_processor_id()];
1825 if (p->ippathid >= iucv_max_pathid) {
1826 WARN_ON(p->ippathid >= iucv_max_pathid);
1827 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1828 return;
1829 }
1830 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
1831 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
1832 if (!work) {
1833 pr_warn("iucv_external_interrupt: out of memory\n");
1834 return;
1835 }
1836 memcpy(&work->data, p, sizeof(work->data));
1837 spin_lock(&iucv_queue_lock);
1838 if (p->iptype == 0x01) {
1839 /* Path pending interrupt. */
1840 list_add_tail(&work->list, &iucv_work_queue);
1841 schedule_work(&iucv_work);
1842 } else {
1843 /* The other interrupts. */
1844 list_add_tail(&work->list, &iucv_task_queue);
1845 tasklet_schedule(&iucv_tasklet);
1846 }
1847 spin_unlock(&iucv_queue_lock);
1848}
1849
1850static int iucv_pm_prepare(struct device *dev)
1851{
1852 int rc = 0;
1853
1854#ifdef CONFIG_PM_DEBUG
1855 printk(KERN_INFO "iucv_pm_prepare\n");
1856#endif
1857 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1858 rc = dev->driver->pm->prepare(dev);
1859 return rc;
1860}
1861
1862static void iucv_pm_complete(struct device *dev)
1863{
1864#ifdef CONFIG_PM_DEBUG
1865 printk(KERN_INFO "iucv_pm_complete\n");
1866#endif
1867 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1868 dev->driver->pm->complete(dev);
1869}
1870
1871/**
1872 * iucv_path_table_empty() - determine if iucv path table is empty
1873 *
1874 * Returns 0 if there are still iucv pathes defined
1875 * 1 if there are no iucv pathes defined
1876 */
1877int iucv_path_table_empty(void)
1878{
1879 int i;
1880
1881 for (i = 0; i < iucv_max_pathid; i++) {
1882 if (iucv_path_table[i])
1883 return 0;
1884 }
1885 return 1;
1886}
1887
1888/**
1889 * iucv_pm_freeze() - Freeze PM callback
1890 * @dev: iucv-based device
1891 *
1892 * disable iucv interrupts
1893 * invoke callback function of the iucv-based driver
1894 * shut down iucv, if no iucv-pathes are established anymore
1895 */
1896static int iucv_pm_freeze(struct device *dev)
1897{
1898 int cpu;
1899 struct iucv_irq_list *p, *n;
1900 int rc = 0;
1901
1902#ifdef CONFIG_PM_DEBUG
1903 printk(KERN_WARNING "iucv_pm_freeze\n");
1904#endif
1905 if (iucv_pm_state != IUCV_PM_FREEZING) {
1906 for_each_cpu(cpu, &iucv_irq_cpumask)
1907 smp_call_function_single(cpu, iucv_block_cpu_almost,
1908 NULL, 1);
1909 cancel_work_sync(&iucv_work);
1910 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1911 list_del_init(&p->list);
1912 iucv_sever_pathid(p->data.ippathid,
1913 iucv_error_no_listener);
1914 kfree(p);
1915 }
1916 }
1917 iucv_pm_state = IUCV_PM_FREEZING;
1918 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1919 rc = dev->driver->pm->freeze(dev);
1920 if (iucv_path_table_empty())
1921 iucv_disable();
1922 return rc;
1923}
1924
1925/**
1926 * iucv_pm_thaw() - Thaw PM callback
1927 * @dev: iucv-based device
1928 *
1929 * make iucv ready for use again: allocate path table, declare interrupt buffers
1930 * and enable iucv interrupts
1931 * invoke callback function of the iucv-based driver
1932 */
1933static int iucv_pm_thaw(struct device *dev)
1934{
1935 int rc = 0;
1936
1937#ifdef CONFIG_PM_DEBUG
1938 printk(KERN_WARNING "iucv_pm_thaw\n");
1939#endif
1940 iucv_pm_state = IUCV_PM_THAWING;
1941 if (!iucv_path_table) {
1942 rc = iucv_enable();
1943 if (rc)
1944 goto out;
1945 }
1946 if (cpumask_empty(&iucv_irq_cpumask)) {
1947 if (iucv_nonsmp_handler)
1948 /* enable interrupts on one cpu */
1949 iucv_allow_cpu(NULL);
1950 else
1951 /* enable interrupts on all cpus */
1952 iucv_setmask_mp();
1953 }
1954 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1955 rc = dev->driver->pm->thaw(dev);
1956out:
1957 return rc;
1958}
1959
1960/**
1961 * iucv_pm_restore() - Restore PM callback
1962 * @dev: iucv-based device
1963 *
1964 * make iucv ready for use again: allocate path table, declare interrupt buffers
1965 * and enable iucv interrupts
1966 * invoke callback function of the iucv-based driver
1967 */
1968static int iucv_pm_restore(struct device *dev)
1969{
1970 int rc = 0;
1971
1972#ifdef CONFIG_PM_DEBUG
1973 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1974#endif
1975 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1976 pr_warn("Suspending Linux did not completely close all IUCV connections\n");
1977 iucv_pm_state = IUCV_PM_RESTORING;
1978 if (cpumask_empty(&iucv_irq_cpumask)) {
1979 rc = iucv_query_maxconn();
1980 rc = iucv_enable();
1981 if (rc)
1982 goto out;
1983 }
1984 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1985 rc = dev->driver->pm->restore(dev);
1986out:
1987 return rc;
1988}
1989
1990struct iucv_interface iucv_if = {
1991 .message_receive = iucv_message_receive,
1992 .__message_receive = __iucv_message_receive,
1993 .message_reply = iucv_message_reply,
1994 .message_reject = iucv_message_reject,
1995 .message_send = iucv_message_send,
1996 .__message_send = __iucv_message_send,
1997 .message_send2way = iucv_message_send2way,
1998 .message_purge = iucv_message_purge,
1999 .path_accept = iucv_path_accept,
2000 .path_connect = iucv_path_connect,
2001 .path_quiesce = iucv_path_quiesce,
2002 .path_resume = iucv_path_resume,
2003 .path_sever = iucv_path_sever,
2004 .iucv_register = iucv_register,
2005 .iucv_unregister = iucv_unregister,
2006 .bus = NULL,
2007 .root = NULL,
2008};
2009EXPORT_SYMBOL(iucv_if);
2010
2011static enum cpuhp_state iucv_online;
2012/**
2013 * iucv_init
2014 *
2015 * Allocates and initializes various data structures.
2016 */
2017static int __init iucv_init(void)
2018{
2019 int rc;
2020
2021 if (!MACHINE_IS_VM) {
2022 rc = -EPROTONOSUPPORT;
2023 goto out;
2024 }
2025 ctl_set_bit(0, 1);
2026 rc = iucv_query_maxconn();
2027 if (rc)
2028 goto out_ctl;
2029 rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2030 if (rc)
2031 goto out_ctl;
2032 iucv_root = root_device_register("iucv");
2033 if (IS_ERR(iucv_root)) {
2034 rc = PTR_ERR(iucv_root);
2035 goto out_int;
2036 }
2037
2038 rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare",
2039 iucv_cpu_prepare, iucv_cpu_dead);
2040 if (rc)
2041 goto out_dev;
2042 rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online",
2043 iucv_cpu_online, iucv_cpu_down_prep);
2044 if (rc < 0)
2045 goto out_prep;
2046 iucv_online = rc;
2047
2048 rc = register_reboot_notifier(&iucv_reboot_notifier);
2049 if (rc)
2050 goto out_remove_hp;
2051 ASCEBC(iucv_error_no_listener, 16);
2052 ASCEBC(iucv_error_no_memory, 16);
2053 ASCEBC(iucv_error_pathid, 16);
2054 iucv_available = 1;
2055 rc = bus_register(&iucv_bus);
2056 if (rc)
2057 goto out_reboot;
2058 iucv_if.root = iucv_root;
2059 iucv_if.bus = &iucv_bus;
2060 return 0;
2061
2062out_reboot:
2063 unregister_reboot_notifier(&iucv_reboot_notifier);
2064out_remove_hp:
2065 cpuhp_remove_state(iucv_online);
2066out_prep:
2067 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
2068out_dev:
2069 root_device_unregister(iucv_root);
2070out_int:
2071 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2072out_ctl:
2073 ctl_clear_bit(0, 1);
2074out:
2075 return rc;
2076}
2077
2078/**
2079 * iucv_exit
2080 *
2081 * Frees everything allocated from iucv_init.
2082 */
2083static void __exit iucv_exit(void)
2084{
2085 struct iucv_irq_list *p, *n;
2086
2087 spin_lock_irq(&iucv_queue_lock);
2088 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2089 kfree(p);
2090 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2091 kfree(p);
2092 spin_unlock_irq(&iucv_queue_lock);
2093 unregister_reboot_notifier(&iucv_reboot_notifier);
2094
2095 cpuhp_remove_state_nocalls(iucv_online);
2096 cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE);
2097 root_device_unregister(iucv_root);
2098 bus_unregister(&iucv_bus);
2099 unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt);
2100}
2101
2102subsys_initcall(iucv_init);
2103module_exit(iucv_exit);
2104
2105MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2106MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2107MODULE_LICENSE("GPL");