blob: fb3faf72e8508f73cea2e435182ea534f84a0ecc [file] [log] [blame]
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001/*
2 * IUCV base infrastructure.
3 *
4 * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s):
6 * Original source:
7 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
8 * Xenia Tkatschow (xenia@us.ibm.com)
9 * 2Gb awareness and general cleanup:
10 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
11 * Rewritten for af_iucv:
12 * Martin Schwidefsky <schwidefsky@de.ibm.com>
13 *
14 * Documentation used:
15 * The original source
16 * CP Programming Service, IBM document # SC24-5760
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2, or (at your option)
21 * any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
33#include <linux/module.h>
34#include <linux/moduleparam.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080035#include <linux/spinlock.h>
36#include <linux/kernel.h>
37#include <linux/slab.h>
38#include <linux/init.h>
39#include <linux/interrupt.h>
40#include <linux/list.h>
41#include <linux/errno.h>
42#include <linux/err.h>
43#include <linux/device.h>
44#include <linux/cpu.h>
45#include <net/iucv/iucv.h>
46#include <asm/atomic.h>
47#include <asm/ebcdic.h>
48#include <asm/io.h>
49#include <asm/s390_ext.h>
50#include <asm/s390_rdev.h>
51#include <asm/smp.h>
52
53/*
54 * FLAGS:
55 * All flags are defined in the field IPFLAGS1 of each function
56 * and can be found in CP Programming Services.
57 * IPSRCCLS - Indicates you have specified a source class.
58 * IPTRGCLS - Indicates you have specified a target class.
59 * IPFGPID - Indicates you have specified a pathid.
60 * IPFGMID - Indicates you have specified a message ID.
61 * IPNORPY - Indicates a one-way message. No reply expected.
62 * IPALL - Indicates that all paths are affected.
63 */
64#define IUCV_IPSRCCLS 0x01
65#define IUCV_IPTRGCLS 0x01
66#define IUCV_IPFGPID 0x02
67#define IUCV_IPFGMID 0x04
68#define IUCV_IPNORPY 0x10
69#define IUCV_IPALL 0x80
70
Heiko Carstensda99f052007-05-04 12:23:27 -070071static int iucv_bus_match(struct device *dev, struct device_driver *drv)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080072{
73 return 0;
74}
75
76struct bus_type iucv_bus = {
77 .name = "iucv",
78 .match = iucv_bus_match,
79};
Heiko Carstensda99f052007-05-04 12:23:27 -070080EXPORT_SYMBOL(iucv_bus);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080081
82struct device *iucv_root;
Heiko Carstensda99f052007-05-04 12:23:27 -070083EXPORT_SYMBOL(iucv_root);
84
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080085static int iucv_available;
86
87/* General IUCV interrupt structure */
88struct iucv_irq_data {
89 u16 ippathid;
90 u8 ipflags1;
91 u8 iptype;
92 u32 res2[8];
93};
94
Martin Schwidefsky04b090d2007-04-28 23:03:59 -070095struct iucv_irq_list {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080096 struct list_head list;
97 struct iucv_irq_data data;
98};
99
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800100static struct iucv_irq_data *iucv_irq_data;
101static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
102static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
103
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700104/*
105 * Queue of interrupt buffers lock for delivery via the tasklet
106 * (fast but can't call smp_call_function).
107 */
108static LIST_HEAD(iucv_task_queue);
109
110/*
111 * The tasklet for fast delivery of iucv interrupts.
112 */
113static void iucv_tasklet_fn(unsigned long);
114static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
115
116/*
117 * Queue of interrupt buffers for delivery via a work queue
118 * (slower but can call smp_call_function).
119 */
120static LIST_HEAD(iucv_work_queue);
121
122/*
123 * The work element to deliver path pending interrupts.
124 */
125static void iucv_work_fn(struct work_struct *work);
126static DECLARE_WORK(iucv_work, iucv_work_fn);
127
128/*
129 * Spinlock protecting task and work queue.
130 */
131static DEFINE_SPINLOCK(iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800132
133enum iucv_command_codes {
134 IUCV_QUERY = 0,
135 IUCV_RETRIEVE_BUFFER = 2,
136 IUCV_SEND = 4,
137 IUCV_RECEIVE = 5,
138 IUCV_REPLY = 6,
139 IUCV_REJECT = 8,
140 IUCV_PURGE = 9,
141 IUCV_ACCEPT = 10,
142 IUCV_CONNECT = 11,
143 IUCV_DECLARE_BUFFER = 12,
144 IUCV_QUIESCE = 13,
145 IUCV_RESUME = 14,
146 IUCV_SEVER = 15,
147 IUCV_SETMASK = 16,
148};
149
150/*
151 * Error messages that are used with the iucv_sever function. They get
152 * converted to EBCDIC.
153 */
154static char iucv_error_no_listener[16] = "NO LISTENER";
155static char iucv_error_no_memory[16] = "NO MEMORY";
156static char iucv_error_pathid[16] = "INVALID PATHID";
157
158/*
159 * iucv_handler_list: List of registered handlers.
160 */
161static LIST_HEAD(iucv_handler_list);
162
163/*
164 * iucv_path_table: an array of iucv_path structures.
165 */
166static struct iucv_path **iucv_path_table;
167static unsigned long iucv_max_pathid;
168
169/*
170 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
171 */
172static DEFINE_SPINLOCK(iucv_table_lock);
173
174/*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700175 * iucv_active_cpu: contains the number of the cpu executing the tasklet
176 * or the work handler. Needed for iucv_path_sever called from tasklet.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800177 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700178static int iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800179
180/*
181 * Mutex and wait queue for iucv_register/iucv_unregister.
182 */
183static DEFINE_MUTEX(iucv_register_mutex);
184
185/*
186 * Counter for number of non-smp capable handlers.
187 */
188static int iucv_nonsmp_handler;
189
190/*
191 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
192 * iucv_path_quiesce and iucv_path_sever.
193 */
194struct iucv_cmd_control {
195 u16 ippathid;
196 u8 ipflags1;
197 u8 iprcode;
198 u16 ipmsglim;
199 u16 res1;
200 u8 ipvmid[8];
201 u8 ipuser[16];
202 u8 iptarget[8];
203} __attribute__ ((packed,aligned(8)));
204
205/*
206 * Data in parameter list iucv structure. Used by iucv_message_send,
207 * iucv_message_send2way and iucv_message_reply.
208 */
209struct iucv_cmd_dpl {
210 u16 ippathid;
211 u8 ipflags1;
212 u8 iprcode;
213 u32 ipmsgid;
214 u32 iptrgcls;
215 u8 iprmmsg[8];
216 u32 ipsrccls;
217 u32 ipmsgtag;
218 u32 ipbfadr2;
219 u32 ipbfln2f;
220 u32 res;
221} __attribute__ ((packed,aligned(8)));
222
223/*
224 * Data in buffer iucv structure. Used by iucv_message_receive,
225 * iucv_message_reject, iucv_message_send, iucv_message_send2way
226 * and iucv_declare_cpu.
227 */
228struct iucv_cmd_db {
229 u16 ippathid;
230 u8 ipflags1;
231 u8 iprcode;
232 u32 ipmsgid;
233 u32 iptrgcls;
234 u32 ipbfadr1;
235 u32 ipbfln1f;
236 u32 ipsrccls;
237 u32 ipmsgtag;
238 u32 ipbfadr2;
239 u32 ipbfln2f;
240 u32 res;
241} __attribute__ ((packed,aligned(8)));
242
243/*
244 * Purge message iucv structure. Used by iucv_message_purge.
245 */
246struct iucv_cmd_purge {
247 u16 ippathid;
248 u8 ipflags1;
249 u8 iprcode;
250 u32 ipmsgid;
251 u8 ipaudit[3];
252 u8 res1[5];
253 u32 res2;
254 u32 ipsrccls;
255 u32 ipmsgtag;
256 u32 res3[3];
257} __attribute__ ((packed,aligned(8)));
258
259/*
260 * Set mask iucv structure. Used by iucv_enable_cpu.
261 */
262struct iucv_cmd_set_mask {
263 u8 ipmask;
264 u8 res1[2];
265 u8 iprcode;
266 u32 res2[9];
267} __attribute__ ((packed,aligned(8)));
268
269union iucv_param {
270 struct iucv_cmd_control ctrl;
271 struct iucv_cmd_dpl dpl;
272 struct iucv_cmd_db db;
273 struct iucv_cmd_purge purge;
274 struct iucv_cmd_set_mask set_mask;
275};
276
277/*
278 * Anchor for per-cpu IUCV command parameter block.
279 */
280static union iucv_param *iucv_param;
281
282/**
283 * iucv_call_b2f0
284 * @code: identifier of IUCV call to CP.
285 * @parm: pointer to a struct iucv_parm block
286 *
287 * Calls CP to execute IUCV commands.
288 *
289 * Returns the result of the CP IUCV call.
290 */
291static inline int iucv_call_b2f0(int command, union iucv_param *parm)
292{
293 register unsigned long reg0 asm ("0");
294 register unsigned long reg1 asm ("1");
295 int ccode;
296
297 reg0 = command;
298 reg1 = virt_to_phys(parm);
299 asm volatile(
300 " .long 0xb2f01000\n"
301 " ipm %0\n"
302 " srl %0,28\n"
303 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
304 : "m" (*parm) : "cc");
305 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
306}
307
308/**
309 * iucv_query_maxconn
310 *
311 * Determines the maximum number of connections that may be established.
312 *
313 * Returns the maximum number of connections or -EPERM is IUCV is not
314 * available.
315 */
316static int iucv_query_maxconn(void)
317{
318 register unsigned long reg0 asm ("0");
319 register unsigned long reg1 asm ("1");
320 void *param;
321 int ccode;
322
323 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
324 if (!param)
325 return -ENOMEM;
326 reg0 = IUCV_QUERY;
327 reg1 = (unsigned long) param;
328 asm volatile (
329 " .long 0xb2f01000\n"
330 " ipm %0\n"
331 " srl %0,28\n"
332 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
333 if (ccode == 0)
334 iucv_max_pathid = reg0;
335 kfree(param);
336 return ccode ? -EPERM : 0;
337}
338
339/**
340 * iucv_allow_cpu
341 * @data: unused
342 *
343 * Allow iucv interrupts on this cpu.
344 */
345static void iucv_allow_cpu(void *data)
346{
347 int cpu = smp_processor_id();
348 union iucv_param *parm;
349
350 /*
351 * Enable all iucv interrupts.
352 * ipmask contains bits for the different interrupts
353 * 0x80 - Flag to allow nonpriority message pending interrupts
354 * 0x40 - Flag to allow priority message pending interrupts
355 * 0x20 - Flag to allow nonpriority message completion interrupts
356 * 0x10 - Flag to allow priority message completion interrupts
357 * 0x08 - Flag to allow IUCV control interrupts
358 */
359 parm = percpu_ptr(iucv_param, smp_processor_id());
360 memset(parm, 0, sizeof(union iucv_param));
361 parm->set_mask.ipmask = 0xf8;
362 iucv_call_b2f0(IUCV_SETMASK, parm);
363
364 /* Set indication that iucv interrupts are allowed for this cpu. */
365 cpu_set(cpu, iucv_irq_cpumask);
366}
367
368/**
369 * iucv_block_cpu
370 * @data: unused
371 *
372 * Block iucv interrupts on this cpu.
373 */
374static void iucv_block_cpu(void *data)
375{
376 int cpu = smp_processor_id();
377 union iucv_param *parm;
378
379 /* Disable all iucv interrupts. */
380 parm = percpu_ptr(iucv_param, smp_processor_id());
381 memset(parm, 0, sizeof(union iucv_param));
382 iucv_call_b2f0(IUCV_SETMASK, parm);
383
384 /* Clear indication that iucv interrupts are allowed for this cpu. */
385 cpu_clear(cpu, iucv_irq_cpumask);
386}
387
388/**
389 * iucv_declare_cpu
390 * @data: unused
391 *
392 * Declare a interupt buffer on this cpu.
393 */
394static void iucv_declare_cpu(void *data)
395{
396 int cpu = smp_processor_id();
397 union iucv_param *parm;
398 int rc;
399
400 if (cpu_isset(cpu, iucv_buffer_cpumask))
401 return;
402
403 /* Declare interrupt buffer. */
404 parm = percpu_ptr(iucv_param, cpu);
405 memset(parm, 0, sizeof(union iucv_param));
406 parm->db.ipbfadr1 = virt_to_phys(percpu_ptr(iucv_irq_data, cpu));
407 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
408 if (rc) {
409 char *err = "Unknown";
Heiko Carstensda99f052007-05-04 12:23:27 -0700410 switch (rc) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800411 case 0x03:
412 err = "Directory error";
413 break;
414 case 0x0a:
415 err = "Invalid length";
416 break;
417 case 0x13:
418 err = "Buffer already exists";
419 break;
420 case 0x3e:
421 err = "Buffer overlap";
422 break;
423 case 0x5c:
424 err = "Paging or storage error";
425 break;
426 }
427 printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
428 "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
429 return;
430 }
431
432 /* Set indication that an iucv buffer exists for this cpu. */
433 cpu_set(cpu, iucv_buffer_cpumask);
434
435 if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
436 /* Enable iucv interrupts on this cpu. */
437 iucv_allow_cpu(NULL);
438 else
439 /* Disable iucv interrupts on this cpu. */
440 iucv_block_cpu(NULL);
441}
442
443/**
444 * iucv_retrieve_cpu
445 * @data: unused
446 *
447 * Retrieve interrupt buffer on this cpu.
448 */
449static void iucv_retrieve_cpu(void *data)
450{
451 int cpu = smp_processor_id();
452 union iucv_param *parm;
453
454 if (!cpu_isset(cpu, iucv_buffer_cpumask))
455 return;
456
457 /* Block iucv interrupts. */
458 iucv_block_cpu(NULL);
459
460 /* Retrieve interrupt buffer. */
461 parm = percpu_ptr(iucv_param, cpu);
462 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
463
464 /* Clear indication that an iucv buffer exists for this cpu. */
465 cpu_clear(cpu, iucv_buffer_cpumask);
466}
467
468/**
469 * iucv_setmask_smp
470 *
471 * Allow iucv interrupts on all cpus.
472 */
473static void iucv_setmask_mp(void)
474{
475 int cpu;
476
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700477 preempt_disable();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800478 for_each_online_cpu(cpu)
479 /* Enable all cpus with a declared buffer. */
480 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
481 !cpu_isset(cpu, iucv_irq_cpumask))
482 smp_call_function_on(iucv_allow_cpu, NULL, 0, 1, cpu);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700483 preempt_enable();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800484}
485
486/**
487 * iucv_setmask_up
488 *
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700489 * Allow iucv interrupts on a single cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800490 */
491static void iucv_setmask_up(void)
492{
493 cpumask_t cpumask;
494 int cpu;
495
496 /* Disable all cpu but the first in cpu_irq_cpumask. */
497 cpumask = iucv_irq_cpumask;
498 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
499 for_each_cpu_mask(cpu, cpumask)
500 smp_call_function_on(iucv_block_cpu, NULL, 0, 1, cpu);
501}
502
503/**
504 * iucv_enable
505 *
506 * This function makes iucv ready for use. It allocates the pathid
507 * table, declares an iucv interrupt buffer and enables the iucv
508 * interrupts. Called when the first user has registered an iucv
509 * handler.
510 */
511static int iucv_enable(void)
512{
513 size_t alloc_size;
514 int cpu, rc;
515
516 rc = -ENOMEM;
517 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
518 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
519 if (!iucv_path_table)
520 goto out;
521 /* Declare per cpu buffers. */
522 rc = -EIO;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700523 preempt_disable();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800524 for_each_online_cpu(cpu)
525 smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700526 preempt_enable();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800527 if (cpus_empty(iucv_buffer_cpumask))
528 /* No cpu could declare an iucv buffer. */
529 goto out_path;
530 return 0;
531
532out_path:
533 kfree(iucv_path_table);
534out:
535 return rc;
536}
537
538/**
539 * iucv_disable
540 *
541 * This function shuts down iucv. It disables iucv interrupts, retrieves
542 * the iucv interrupt buffer and frees the pathid table. Called after the
543 * last user unregister its iucv handler.
544 */
545static void iucv_disable(void)
546{
547 on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
548 kfree(iucv_path_table);
549}
550
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800551static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
552 unsigned long action, void *hcpu)
553{
554 cpumask_t cpumask;
555 long cpu = (long) hcpu;
556
557 switch (action) {
558 case CPU_UP_PREPARE:
559 if (!percpu_populate(iucv_irq_data,
560 sizeof(struct iucv_irq_data),
561 GFP_KERNEL|GFP_DMA, cpu))
562 return NOTIFY_BAD;
563 if (!percpu_populate(iucv_param, sizeof(union iucv_param),
564 GFP_KERNEL|GFP_DMA, cpu)) {
565 percpu_depopulate(iucv_irq_data, cpu);
566 return NOTIFY_BAD;
567 }
568 break;
569 case CPU_UP_CANCELED:
570 case CPU_DEAD:
571 percpu_depopulate(iucv_param, cpu);
572 percpu_depopulate(iucv_irq_data, cpu);
573 break;
574 case CPU_ONLINE:
575 case CPU_DOWN_FAILED:
576 smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
577 break;
578 case CPU_DOWN_PREPARE:
579 cpumask = iucv_buffer_cpumask;
580 cpu_clear(cpu, cpumask);
581 if (cpus_empty(cpumask))
582 /* Can't offline last IUCV enabled cpu. */
583 return NOTIFY_BAD;
584 smp_call_function_on(iucv_retrieve_cpu, NULL, 0, 1, cpu);
585 if (cpus_empty(iucv_irq_cpumask))
586 smp_call_function_on(iucv_allow_cpu, NULL, 0, 1,
587 first_cpu(iucv_buffer_cpumask));
588 break;
589 }
590 return NOTIFY_OK;
591}
592
Heiko Carstensda99f052007-05-04 12:23:27 -0700593static struct notifier_block __cpuinitdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800594 .notifier_call = iucv_cpu_notify,
595};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800596
597/**
598 * iucv_sever_pathid
599 * @pathid: path identification number.
600 * @userdata: 16-bytes of user data.
601 *
602 * Sever an iucv path to free up the pathid. Used internally.
603 */
604static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
605{
606 union iucv_param *parm;
607
608 parm = percpu_ptr(iucv_param, smp_processor_id());
609 memset(parm, 0, sizeof(union iucv_param));
610 if (userdata)
611 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
612 parm->ctrl.ippathid = pathid;
613 return iucv_call_b2f0(IUCV_SEVER, parm);
614}
615
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700616#ifdef CONFIG_SMP
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800617/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700618 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800619 * @dummy: unused dummy argument
620 *
621 * Nop function called via smp_call_function to force work items from
622 * pending external iucv interrupts to the work queue.
623 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700624static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800625{
626}
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700627#endif
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800628
629/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700630 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800631 *
632 * Function called after a path has been severed to find all remaining
633 * work items for the now stale pathid. The caller needs to hold the
634 * iucv_table_lock.
635 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700636static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800637{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700638 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800639
640 /*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700641 * When a path is severed, the pathid can be reused immediatly
642 * on a iucv connect or a connection pending interrupt. Remove
643 * all entries from the task queue that refer to a stale pathid
644 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
645 * or deliver the connection pending interrupt. To get all the
646 * pending interrupts force them to the work queue by calling
647 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800648 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700649 smp_call_function(__iucv_cleanup_queue, NULL, 0, 1);
650 spin_lock_irq(&iucv_queue_lock);
651 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
652 /* Remove stale work items from the task queue. */
653 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800654 list_del(&p->list);
655 kfree(p);
656 }
657 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700658 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800659}
660
661/**
662 * iucv_register:
663 * @handler: address of iucv handler structure
664 * @smp: != 0 indicates that the handler can deal with out of order messages
665 *
666 * Registers a driver with IUCV.
667 *
668 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
669 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
670 */
671int iucv_register(struct iucv_handler *handler, int smp)
672{
673 int rc;
674
675 if (!iucv_available)
676 return -ENOSYS;
677 mutex_lock(&iucv_register_mutex);
678 if (!smp)
679 iucv_nonsmp_handler++;
680 if (list_empty(&iucv_handler_list)) {
681 rc = iucv_enable();
682 if (rc)
683 goto out_mutex;
684 } else if (!smp && iucv_nonsmp_handler == 1)
685 iucv_setmask_up();
686 INIT_LIST_HEAD(&handler->paths);
687
688 spin_lock_irq(&iucv_table_lock);
689 list_add_tail(&handler->list, &iucv_handler_list);
690 spin_unlock_irq(&iucv_table_lock);
691 rc = 0;
692out_mutex:
693 mutex_unlock(&iucv_register_mutex);
694 return rc;
695}
Heiko Carstensda99f052007-05-04 12:23:27 -0700696EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800697
698/**
699 * iucv_unregister
700 * @handler: address of iucv handler structure
701 * @smp: != 0 indicates that the handler can deal with out of order messages
702 *
703 * Unregister driver from IUCV.
704 */
705void iucv_unregister(struct iucv_handler *handler, int smp)
706{
707 struct iucv_path *p, *n;
708
709 mutex_lock(&iucv_register_mutex);
710 spin_lock_bh(&iucv_table_lock);
711 /* Remove handler from the iucv_handler_list. */
712 list_del_init(&handler->list);
713 /* Sever all pathids still refering to the handler. */
714 list_for_each_entry_safe(p, n, &handler->paths, list) {
715 iucv_sever_pathid(p->pathid, NULL);
716 iucv_path_table[p->pathid] = NULL;
717 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800718 iucv_path_free(p);
719 }
720 spin_unlock_bh(&iucv_table_lock);
721 if (!smp)
722 iucv_nonsmp_handler--;
723 if (list_empty(&iucv_handler_list))
724 iucv_disable();
725 else if (!smp && iucv_nonsmp_handler == 0)
726 iucv_setmask_mp();
727 mutex_unlock(&iucv_register_mutex);
728}
Heiko Carstensda99f052007-05-04 12:23:27 -0700729EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800730
731/**
732 * iucv_path_accept
733 * @path: address of iucv path structure
734 * @handler: address of iucv handler structure
735 * @userdata: 16 bytes of data reflected to the communication partner
736 * @private: private data passed to interrupt handlers for this path
737 *
738 * This function is issued after the user received a connection pending
739 * external interrupt and now wishes to complete the IUCV communication path.
740 *
741 * Returns the result of the CP IUCV call.
742 */
743int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
744 u8 userdata[16], void *private)
745{
746 union iucv_param *parm;
747 int rc;
748
749 local_bh_disable();
750 /* Prepare parameter block. */
751 parm = percpu_ptr(iucv_param, smp_processor_id());
752 memset(parm, 0, sizeof(union iucv_param));
753 parm->ctrl.ippathid = path->pathid;
754 parm->ctrl.ipmsglim = path->msglim;
755 if (userdata)
756 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
757 parm->ctrl.ipflags1 = path->flags;
758
759 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
760 if (!rc) {
761 path->private = private;
762 path->msglim = parm->ctrl.ipmsglim;
763 path->flags = parm->ctrl.ipflags1;
764 }
765 local_bh_enable();
766 return rc;
767}
Heiko Carstensda99f052007-05-04 12:23:27 -0700768EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800769
770/**
771 * iucv_path_connect
772 * @path: address of iucv path structure
773 * @handler: address of iucv handler structure
774 * @userid: 8-byte user identification
775 * @system: 8-byte target system identification
776 * @userdata: 16 bytes of data reflected to the communication partner
777 * @private: private data passed to interrupt handlers for this path
778 *
779 * This function establishes an IUCV path. Although the connect may complete
780 * successfully, you are not able to use the path until you receive an IUCV
781 * Connection Complete external interrupt.
782 *
783 * Returns the result of the CP IUCV call.
784 */
785int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
786 u8 userid[8], u8 system[8], u8 userdata[16],
787 void *private)
788{
789 union iucv_param *parm;
790 int rc;
791
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700792 BUG_ON(in_atomic());
793 spin_lock_bh(&iucv_table_lock);
794 iucv_cleanup_queue();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800795 parm = percpu_ptr(iucv_param, smp_processor_id());
796 memset(parm, 0, sizeof(union iucv_param));
797 parm->ctrl.ipmsglim = path->msglim;
798 parm->ctrl.ipflags1 = path->flags;
799 if (userid) {
800 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
801 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
802 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
803 }
804 if (system) {
805 memcpy(parm->ctrl.iptarget, system,
806 sizeof(parm->ctrl.iptarget));
807 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
808 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
809 }
810 if (userdata)
811 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
812
813 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
814 if (!rc) {
815 if (parm->ctrl.ippathid < iucv_max_pathid) {
816 path->pathid = parm->ctrl.ippathid;
817 path->msglim = parm->ctrl.ipmsglim;
818 path->flags = parm->ctrl.ipflags1;
819 path->handler = handler;
820 path->private = private;
821 list_add_tail(&path->list, &handler->paths);
822 iucv_path_table[path->pathid] = path;
823 } else {
824 iucv_sever_pathid(parm->ctrl.ippathid,
825 iucv_error_pathid);
826 rc = -EIO;
827 }
828 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700829 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800830 return rc;
831}
Heiko Carstensda99f052007-05-04 12:23:27 -0700832EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800833
834/**
835 * iucv_path_quiesce:
836 * @path: address of iucv path structure
837 * @userdata: 16 bytes of data reflected to the communication partner
838 *
839 * This function temporarily suspends incoming messages on an IUCV path.
840 * You can later reactivate the path by invoking the iucv_resume function.
841 *
842 * Returns the result from the CP IUCV call.
843 */
844int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
845{
846 union iucv_param *parm;
847 int rc;
848
849 local_bh_disable();
850 parm = percpu_ptr(iucv_param, smp_processor_id());
851 memset(parm, 0, sizeof(union iucv_param));
852 if (userdata)
853 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
854 parm->ctrl.ippathid = path->pathid;
855 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
856 local_bh_enable();
857 return rc;
858}
Heiko Carstensda99f052007-05-04 12:23:27 -0700859EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800860
861/**
862 * iucv_path_resume:
863 * @path: address of iucv path structure
864 * @userdata: 16 bytes of data reflected to the communication partner
865 *
866 * This function resumes incoming messages on an IUCV path that has
867 * been stopped with iucv_path_quiesce.
868 *
869 * Returns the result from the CP IUCV call.
870 */
871int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
872{
873 union iucv_param *parm;
874 int rc;
875
876 local_bh_disable();
877 parm = percpu_ptr(iucv_param, smp_processor_id());
878 memset(parm, 0, sizeof(union iucv_param));
879 if (userdata)
880 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
881 parm->ctrl.ippathid = path->pathid;
882 rc = iucv_call_b2f0(IUCV_RESUME, parm);
883 local_bh_enable();
884 return rc;
885}
886
887/**
888 * iucv_path_sever
889 * @path: address of iucv path structure
890 * @userdata: 16 bytes of data reflected to the communication partner
891 *
892 * This function terminates an IUCV path.
893 *
894 * Returns the result from the CP IUCV call.
895 */
896int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
897{
898 int rc;
899
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800900 preempt_disable();
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700901 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800902 spin_lock_bh(&iucv_table_lock);
903 rc = iucv_sever_pathid(path->pathid, userdata);
904 if (!rc) {
905 iucv_path_table[path->pathid] = NULL;
906 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800907 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700908 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800909 spin_unlock_bh(&iucv_table_lock);
910 preempt_enable();
911 return rc;
912}
Heiko Carstensda99f052007-05-04 12:23:27 -0700913EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800914
915/**
916 * iucv_message_purge
917 * @path: address of iucv path structure
918 * @msg: address of iucv msg structure
919 * @srccls: source class of message
920 *
921 * Cancels a message you have sent.
922 *
923 * Returns the result from the CP IUCV call.
924 */
925int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
926 u32 srccls)
927{
928 union iucv_param *parm;
929 int rc;
930
931 local_bh_disable();
932 parm = percpu_ptr(iucv_param, smp_processor_id());
933 memset(parm, 0, sizeof(union iucv_param));
934 parm->purge.ippathid = path->pathid;
935 parm->purge.ipmsgid = msg->id;
936 parm->purge.ipsrccls = srccls;
937 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
938 rc = iucv_call_b2f0(IUCV_PURGE, parm);
939 if (!rc) {
940 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
941 msg->tag = parm->purge.ipmsgtag;
942 }
943 local_bh_enable();
944 return rc;
945}
Heiko Carstensda99f052007-05-04 12:23:27 -0700946EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800947
948/**
949 * iucv_message_receive
950 * @path: address of iucv path structure
951 * @msg: address of iucv msg structure
952 * @flags: how the message is received (IUCV_IPBUFLST)
953 * @buffer: address of data buffer or address of struct iucv_array
954 * @size: length of data buffer
955 * @residual:
956 *
957 * This function receives messages that are being sent to you over
958 * established paths. This function will deal with RMDATA messages
959 * embedded in struct iucv_message as well.
960 *
961 * Returns the result from the CP IUCV call.
962 */
963int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
964 u8 flags, void *buffer, size_t size, size_t *residual)
965{
966 union iucv_param *parm;
967 struct iucv_array *array;
968 u8 *rmmsg;
969 size_t copy;
970 int rc;
971
972 if (msg->flags & IUCV_IPRMDATA) {
973 /*
974 * Message is 8 bytes long and has been stored to the
975 * message descriptor itself.
976 */
977 rc = (size < 8) ? 5 : 0;
978 if (residual)
979 *residual = abs(size - 8);
980 rmmsg = msg->rmmsg;
981 if (flags & IUCV_IPBUFLST) {
982 /* Copy to struct iucv_array. */
983 size = (size < 8) ? size : 8;
984 for (array = buffer; size > 0; array++) {
985 copy = min_t(size_t, size, array->length);
986 memcpy((u8 *)(addr_t) array->address,
987 rmmsg, copy);
988 rmmsg += copy;
989 size -= copy;
990 }
991 } else {
992 /* Copy to direct buffer. */
993 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
994 }
995 return 0;
996 }
997
998 local_bh_disable();
999 parm = percpu_ptr(iucv_param, smp_processor_id());
1000 memset(parm, 0, sizeof(union iucv_param));
1001 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1002 parm->db.ipbfln1f = (u32) size;
1003 parm->db.ipmsgid = msg->id;
1004 parm->db.ippathid = path->pathid;
1005 parm->db.iptrgcls = msg->class;
1006 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1007 IUCV_IPFGMID | IUCV_IPTRGCLS);
1008 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1009 if (!rc || rc == 5) {
1010 msg->flags = parm->db.ipflags1;
1011 if (residual)
1012 *residual = parm->db.ipbfln1f;
1013 }
1014 local_bh_enable();
1015 return rc;
1016}
Heiko Carstensda99f052007-05-04 12:23:27 -07001017EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001018
1019/**
1020 * iucv_message_reject
1021 * @path: address of iucv path structure
1022 * @msg: address of iucv msg structure
1023 *
1024 * The reject function refuses a specified message. Between the time you
1025 * are notified of a message and the time that you complete the message,
1026 * the message may be rejected.
1027 *
1028 * Returns the result from the CP IUCV call.
1029 */
1030int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1031{
1032 union iucv_param *parm;
1033 int rc;
1034
1035 local_bh_disable();
1036 parm = percpu_ptr(iucv_param, smp_processor_id());
1037 memset(parm, 0, sizeof(union iucv_param));
1038 parm->db.ippathid = path->pathid;
1039 parm->db.ipmsgid = msg->id;
1040 parm->db.iptrgcls = msg->class;
1041 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1042 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1043 local_bh_enable();
1044 return rc;
1045}
Heiko Carstensda99f052007-05-04 12:23:27 -07001046EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001047
1048/**
1049 * iucv_message_reply
1050 * @path: address of iucv path structure
1051 * @msg: address of iucv msg structure
1052 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1053 * @reply: address of reply data buffer or address of struct iucv_array
1054 * @size: length of reply data buffer
1055 *
1056 * This function responds to the two-way messages that you receive. You
1057 * must identify completely the message to which you wish to reply. ie,
1058 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1059 * the parameter list.
1060 *
1061 * Returns the result from the CP IUCV call.
1062 */
1063int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1064 u8 flags, void *reply, size_t size)
1065{
1066 union iucv_param *parm;
1067 int rc;
1068
1069 local_bh_disable();
1070 parm = percpu_ptr(iucv_param, smp_processor_id());
1071 memset(parm, 0, sizeof(union iucv_param));
1072 if (flags & IUCV_IPRMDATA) {
1073 parm->dpl.ippathid = path->pathid;
1074 parm->dpl.ipflags1 = flags;
1075 parm->dpl.ipmsgid = msg->id;
1076 parm->dpl.iptrgcls = msg->class;
1077 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1078 } else {
1079 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1080 parm->db.ipbfln1f = (u32) size;
1081 parm->db.ippathid = path->pathid;
1082 parm->db.ipflags1 = flags;
1083 parm->db.ipmsgid = msg->id;
1084 parm->db.iptrgcls = msg->class;
1085 }
1086 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1087 local_bh_enable();
1088 return rc;
1089}
Heiko Carstensda99f052007-05-04 12:23:27 -07001090EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001091
1092/**
1093 * iucv_message_send
1094 * @path: address of iucv path structure
1095 * @msg: address of iucv msg structure
1096 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1097 * @srccls: source class of message
1098 * @buffer: address of send buffer or address of struct iucv_array
1099 * @size: length of send buffer
1100 *
1101 * This function transmits data to another application. Data to be
1102 * transmitted is in a buffer and this is a one-way message and the
1103 * receiver will not reply to the message.
1104 *
1105 * Returns the result from the CP IUCV call.
1106 */
1107int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1108 u8 flags, u32 srccls, void *buffer, size_t size)
1109{
1110 union iucv_param *parm;
1111 int rc;
1112
1113 local_bh_disable();
1114 parm = percpu_ptr(iucv_param, smp_processor_id());
1115 memset(parm, 0, sizeof(union iucv_param));
1116 if (flags & IUCV_IPRMDATA) {
1117 /* Message of 8 bytes can be placed into the parameter list. */
1118 parm->dpl.ippathid = path->pathid;
1119 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1120 parm->dpl.iptrgcls = msg->class;
1121 parm->dpl.ipsrccls = srccls;
1122 parm->dpl.ipmsgtag = msg->tag;
1123 memcpy(parm->dpl.iprmmsg, buffer, 8);
1124 } else {
1125 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1126 parm->db.ipbfln1f = (u32) size;
1127 parm->db.ippathid = path->pathid;
1128 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1129 parm->db.iptrgcls = msg->class;
1130 parm->db.ipsrccls = srccls;
1131 parm->db.ipmsgtag = msg->tag;
1132 }
1133 rc = iucv_call_b2f0(IUCV_SEND, parm);
1134 if (!rc)
1135 msg->id = parm->db.ipmsgid;
1136 local_bh_enable();
1137 return rc;
1138}
Heiko Carstensda99f052007-05-04 12:23:27 -07001139EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001140
1141/**
1142 * iucv_message_send2way
1143 * @path: address of iucv path structure
1144 * @msg: address of iucv msg structure
1145 * @flags: how the message is sent and the reply is received
1146 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1147 * @srccls: source class of message
1148 * @buffer: address of send buffer or address of struct iucv_array
1149 * @size: length of send buffer
1150 * @ansbuf: address of answer buffer or address of struct iucv_array
1151 * @asize: size of reply buffer
1152 *
1153 * This function transmits data to another application. Data to be
1154 * transmitted is in a buffer. The receiver of the send is expected to
1155 * reply to the message and a buffer is provided into which IUCV moves
1156 * the reply to this message.
1157 *
1158 * Returns the result from the CP IUCV call.
1159 */
1160int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1161 u8 flags, u32 srccls, void *buffer, size_t size,
1162 void *answer, size_t asize, size_t *residual)
1163{
1164 union iucv_param *parm;
1165 int rc;
1166
1167 local_bh_disable();
1168 parm = percpu_ptr(iucv_param, smp_processor_id());
1169 memset(parm, 0, sizeof(union iucv_param));
1170 if (flags & IUCV_IPRMDATA) {
1171 parm->dpl.ippathid = path->pathid;
1172 parm->dpl.ipflags1 = path->flags; /* priority message */
1173 parm->dpl.iptrgcls = msg->class;
1174 parm->dpl.ipsrccls = srccls;
1175 parm->dpl.ipmsgtag = msg->tag;
1176 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1177 parm->dpl.ipbfln2f = (u32) asize;
1178 memcpy(parm->dpl.iprmmsg, buffer, 8);
1179 } else {
1180 parm->db.ippathid = path->pathid;
1181 parm->db.ipflags1 = path->flags; /* priority message */
1182 parm->db.iptrgcls = msg->class;
1183 parm->db.ipsrccls = srccls;
1184 parm->db.ipmsgtag = msg->tag;
1185 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1186 parm->db.ipbfln1f = (u32) size;
1187 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1188 parm->db.ipbfln2f = (u32) asize;
1189 }
1190 rc = iucv_call_b2f0(IUCV_SEND, parm);
1191 if (!rc)
1192 msg->id = parm->db.ipmsgid;
1193 local_bh_enable();
1194 return rc;
1195}
Heiko Carstensda99f052007-05-04 12:23:27 -07001196EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001197
1198/**
1199 * iucv_path_pending
1200 * @data: Pointer to external interrupt buffer
1201 *
1202 * Process connection pending work item. Called from tasklet while holding
1203 * iucv_table_lock.
1204 */
1205struct iucv_path_pending {
1206 u16 ippathid;
1207 u8 ipflags1;
1208 u8 iptype;
1209 u16 ipmsglim;
1210 u16 res1;
1211 u8 ipvmid[8];
1212 u8 ipuser[16];
1213 u32 res3;
1214 u8 ippollfg;
1215 u8 res4[3];
1216} __attribute__ ((packed));
1217
1218static void iucv_path_pending(struct iucv_irq_data *data)
1219{
1220 struct iucv_path_pending *ipp = (void *) data;
1221 struct iucv_handler *handler;
1222 struct iucv_path *path;
1223 char *error;
1224
1225 BUG_ON(iucv_path_table[ipp->ippathid]);
1226 /* New pathid, handler found. Create a new path struct. */
1227 error = iucv_error_no_memory;
1228 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1229 if (!path)
1230 goto out_sever;
1231 path->pathid = ipp->ippathid;
1232 iucv_path_table[path->pathid] = path;
1233 EBCASC(ipp->ipvmid, 8);
1234
1235 /* Call registered handler until one is found that wants the path. */
1236 list_for_each_entry(handler, &iucv_handler_list, list) {
1237 if (!handler->path_pending)
1238 continue;
1239 /*
1240 * Add path to handler to allow a call to iucv_path_sever
1241 * inside the path_pending function. If the handler returns
1242 * an error remove the path from the handler again.
1243 */
1244 list_add(&path->list, &handler->paths);
1245 path->handler = handler;
1246 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1247 return;
1248 list_del(&path->list);
1249 path->handler = NULL;
1250 }
1251 /* No handler wanted the path. */
1252 iucv_path_table[path->pathid] = NULL;
1253 iucv_path_free(path);
1254 error = iucv_error_no_listener;
1255out_sever:
1256 iucv_sever_pathid(ipp->ippathid, error);
1257}
1258
1259/**
1260 * iucv_path_complete
1261 * @data: Pointer to external interrupt buffer
1262 *
1263 * Process connection complete work item. Called from tasklet while holding
1264 * iucv_table_lock.
1265 */
1266struct iucv_path_complete {
1267 u16 ippathid;
1268 u8 ipflags1;
1269 u8 iptype;
1270 u16 ipmsglim;
1271 u16 res1;
1272 u8 res2[8];
1273 u8 ipuser[16];
1274 u32 res3;
1275 u8 ippollfg;
1276 u8 res4[3];
1277} __attribute__ ((packed));
1278
1279static void iucv_path_complete(struct iucv_irq_data *data)
1280{
1281 struct iucv_path_complete *ipc = (void *) data;
1282 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1283
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001284 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001285 path->handler->path_complete(path, ipc->ipuser);
1286}
1287
1288/**
1289 * iucv_path_severed
1290 * @data: Pointer to external interrupt buffer
1291 *
1292 * Process connection severed work item. Called from tasklet while holding
1293 * iucv_table_lock.
1294 */
1295struct iucv_path_severed {
1296 u16 ippathid;
1297 u8 res1;
1298 u8 iptype;
1299 u32 res2;
1300 u8 res3[8];
1301 u8 ipuser[16];
1302 u32 res4;
1303 u8 ippollfg;
1304 u8 res5[3];
1305} __attribute__ ((packed));
1306
1307static void iucv_path_severed(struct iucv_irq_data *data)
1308{
1309 struct iucv_path_severed *ips = (void *) data;
1310 struct iucv_path *path = iucv_path_table[ips->ippathid];
1311
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001312 if (!path || !path->handler) /* Already severed */
1313 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001314 if (path->handler->path_severed)
1315 path->handler->path_severed(path, ips->ipuser);
1316 else {
1317 iucv_sever_pathid(path->pathid, NULL);
1318 iucv_path_table[path->pathid] = NULL;
1319 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001320 iucv_path_free(path);
1321 }
1322}
1323
1324/**
1325 * iucv_path_quiesced
1326 * @data: Pointer to external interrupt buffer
1327 *
1328 * Process connection quiesced work item. Called from tasklet while holding
1329 * iucv_table_lock.
1330 */
1331struct iucv_path_quiesced {
1332 u16 ippathid;
1333 u8 res1;
1334 u8 iptype;
1335 u32 res2;
1336 u8 res3[8];
1337 u8 ipuser[16];
1338 u32 res4;
1339 u8 ippollfg;
1340 u8 res5[3];
1341} __attribute__ ((packed));
1342
1343static void iucv_path_quiesced(struct iucv_irq_data *data)
1344{
1345 struct iucv_path_quiesced *ipq = (void *) data;
1346 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1347
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001348 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001349 path->handler->path_quiesced(path, ipq->ipuser);
1350}
1351
1352/**
1353 * iucv_path_resumed
1354 * @data: Pointer to external interrupt buffer
1355 *
1356 * Process connection resumed work item. Called from tasklet while holding
1357 * iucv_table_lock.
1358 */
1359struct iucv_path_resumed {
1360 u16 ippathid;
1361 u8 res1;
1362 u8 iptype;
1363 u32 res2;
1364 u8 res3[8];
1365 u8 ipuser[16];
1366 u32 res4;
1367 u8 ippollfg;
1368 u8 res5[3];
1369} __attribute__ ((packed));
1370
1371static void iucv_path_resumed(struct iucv_irq_data *data)
1372{
1373 struct iucv_path_resumed *ipr = (void *) data;
1374 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1375
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001376 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001377 path->handler->path_resumed(path, ipr->ipuser);
1378}
1379
1380/**
1381 * iucv_message_complete
1382 * @data: Pointer to external interrupt buffer
1383 *
1384 * Process message complete work item. Called from tasklet while holding
1385 * iucv_table_lock.
1386 */
1387struct iucv_message_complete {
1388 u16 ippathid;
1389 u8 ipflags1;
1390 u8 iptype;
1391 u32 ipmsgid;
1392 u32 ipaudit;
1393 u8 iprmmsg[8];
1394 u32 ipsrccls;
1395 u32 ipmsgtag;
1396 u32 res;
1397 u32 ipbfln2f;
1398 u8 ippollfg;
1399 u8 res2[3];
1400} __attribute__ ((packed));
1401
1402static void iucv_message_complete(struct iucv_irq_data *data)
1403{
1404 struct iucv_message_complete *imc = (void *) data;
1405 struct iucv_path *path = iucv_path_table[imc->ippathid];
1406 struct iucv_message msg;
1407
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001408 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001409 msg.flags = imc->ipflags1;
1410 msg.id = imc->ipmsgid;
1411 msg.audit = imc->ipaudit;
1412 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1413 msg.class = imc->ipsrccls;
1414 msg.tag = imc->ipmsgtag;
1415 msg.length = imc->ipbfln2f;
1416 path->handler->message_complete(path, &msg);
1417 }
1418}
1419
1420/**
1421 * iucv_message_pending
1422 * @data: Pointer to external interrupt buffer
1423 *
1424 * Process message pending work item. Called from tasklet while holding
1425 * iucv_table_lock.
1426 */
1427struct iucv_message_pending {
1428 u16 ippathid;
1429 u8 ipflags1;
1430 u8 iptype;
1431 u32 ipmsgid;
1432 u32 iptrgcls;
1433 union {
1434 u32 iprmmsg1_u32;
1435 u8 iprmmsg1[4];
1436 } ln1msg1;
1437 union {
1438 u32 ipbfln1f;
1439 u8 iprmmsg2[4];
1440 } ln1msg2;
1441 u32 res1[3];
1442 u32 ipbfln2f;
1443 u8 ippollfg;
1444 u8 res2[3];
1445} __attribute__ ((packed));
1446
1447static void iucv_message_pending(struct iucv_irq_data *data)
1448{
1449 struct iucv_message_pending *imp = (void *) data;
1450 struct iucv_path *path = iucv_path_table[imp->ippathid];
1451 struct iucv_message msg;
1452
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001453 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001454 msg.flags = imp->ipflags1;
1455 msg.id = imp->ipmsgid;
1456 msg.class = imp->iptrgcls;
1457 if (imp->ipflags1 & IUCV_IPRMDATA) {
1458 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1459 msg.length = 8;
1460 } else
1461 msg.length = imp->ln1msg2.ipbfln1f;
1462 msg.reply_size = imp->ipbfln2f;
1463 path->handler->message_pending(path, &msg);
1464 }
1465}
1466
1467/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001468 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001469 *
1470 * This tasklet loops over the queue of irq buffers created by
1471 * iucv_external_interrupt, calls the appropriate action handler
1472 * and then frees the buffer.
1473 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001474static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001475{
1476 typedef void iucv_irq_fn(struct iucv_irq_data *);
1477 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001478 [0x02] = iucv_path_complete,
1479 [0x03] = iucv_path_severed,
1480 [0x04] = iucv_path_quiesced,
1481 [0x05] = iucv_path_resumed,
1482 [0x06] = iucv_message_complete,
1483 [0x07] = iucv_message_complete,
1484 [0x08] = iucv_message_pending,
1485 [0x09] = iucv_message_pending,
1486 };
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001487 struct list_head task_queue = LIST_HEAD_INIT(task_queue);
1488 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001489
1490 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1491 spin_lock(&iucv_table_lock);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001492 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001493
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001494 spin_lock_irq(&iucv_queue_lock);
1495 list_splice_init(&iucv_task_queue, &task_queue);
1496 spin_unlock_irq(&iucv_queue_lock);
1497
1498 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001499 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001500 irq_fn[p->data.iptype](&p->data);
1501 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001502 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001503
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001504 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001505 spin_unlock(&iucv_table_lock);
1506}
1507
1508/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001509 * iucv_work_fn:
1510 *
1511 * This work function loops over the queue of path pending irq blocks
1512 * created by iucv_external_interrupt, calls the appropriate action
1513 * handler and then frees the buffer.
1514 */
1515static void iucv_work_fn(struct work_struct *work)
1516{
1517 typedef void iucv_irq_fn(struct iucv_irq_data *);
1518 struct list_head work_queue = LIST_HEAD_INIT(work_queue);
1519 struct iucv_irq_list *p, *n;
1520
1521 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1522 spin_lock_bh(&iucv_table_lock);
1523 iucv_active_cpu = smp_processor_id();
1524
1525 spin_lock_irq(&iucv_queue_lock);
1526 list_splice_init(&iucv_work_queue, &work_queue);
1527 spin_unlock_irq(&iucv_queue_lock);
1528
1529 iucv_cleanup_queue();
1530 list_for_each_entry_safe(p, n, &work_queue, list) {
1531 list_del_init(&p->list);
1532 iucv_path_pending(&p->data);
1533 kfree(p);
1534 }
1535
1536 iucv_active_cpu = -1;
1537 spin_unlock_bh(&iucv_table_lock);
1538}
1539
1540/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001541 * iucv_external_interrupt
1542 * @code: irq code
1543 *
1544 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001545 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001546 */
1547static void iucv_external_interrupt(u16 code)
1548{
1549 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001550 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001551
1552 p = percpu_ptr(iucv_irq_data, smp_processor_id());
1553 if (p->ippathid >= iucv_max_pathid) {
1554 printk(KERN_WARNING "iucv_do_int: Got interrupt with "
1555 "pathid %d > max_connections (%ld)\n",
1556 p->ippathid, iucv_max_pathid - 1);
1557 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1558 return;
1559 }
1560 if (p->iptype < 0x01 || p->iptype > 0x09) {
1561 printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
1562 return;
1563 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001564 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001565 if (!work) {
1566 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1567 return;
1568 }
1569 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001570 spin_lock(&iucv_queue_lock);
1571 if (p->iptype == 0x01) {
1572 /* Path pending interrupt. */
1573 list_add_tail(&work->list, &iucv_work_queue);
1574 schedule_work(&iucv_work);
1575 } else {
1576 /* The other interrupts. */
1577 list_add_tail(&work->list, &iucv_task_queue);
1578 tasklet_schedule(&iucv_tasklet);
1579 }
1580 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001581}
1582
1583/**
1584 * iucv_init
1585 *
1586 * Allocates and initializes various data structures.
1587 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001588static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001589{
1590 int rc;
1591
1592 if (!MACHINE_IS_VM) {
1593 rc = -EPROTONOSUPPORT;
1594 goto out;
1595 }
1596 rc = iucv_query_maxconn();
1597 if (rc)
1598 goto out;
Heiko Carstensda99f052007-05-04 12:23:27 -07001599 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001600 if (rc)
1601 goto out;
1602 rc = bus_register(&iucv_bus);
1603 if (rc)
1604 goto out_int;
1605 iucv_root = s390_root_dev_register("iucv");
1606 if (IS_ERR(iucv_root)) {
1607 rc = PTR_ERR(iucv_root);
1608 goto out_bus;
1609 }
Heiko Carstensda99f052007-05-04 12:23:27 -07001610 /* Note: GFP_DMA used to get memory below 2G */
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001611 iucv_irq_data = percpu_alloc(sizeof(struct iucv_irq_data),
1612 GFP_KERNEL|GFP_DMA);
1613 if (!iucv_irq_data) {
1614 rc = -ENOMEM;
1615 goto out_root;
1616 }
1617 /* Allocate parameter blocks. */
1618 iucv_param = percpu_alloc(sizeof(union iucv_param),
1619 GFP_KERNEL|GFP_DMA);
1620 if (!iucv_param) {
1621 rc = -ENOMEM;
1622 goto out_extint;
1623 }
1624 register_hotcpu_notifier(&iucv_cpu_notifier);
1625 ASCEBC(iucv_error_no_listener, 16);
1626 ASCEBC(iucv_error_no_memory, 16);
1627 ASCEBC(iucv_error_pathid, 16);
1628 iucv_available = 1;
1629 return 0;
1630
1631out_extint:
1632 percpu_free(iucv_irq_data);
1633out_root:
1634 s390_root_dev_unregister(iucv_root);
1635out_bus:
1636 bus_unregister(&iucv_bus);
1637out_int:
1638 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1639out:
1640 return rc;
1641}
1642
1643/**
1644 * iucv_exit
1645 *
1646 * Frees everything allocated from iucv_init.
1647 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001648static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001649{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001650 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001651
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001652 spin_lock_irq(&iucv_queue_lock);
1653 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1654 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001655 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1656 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001657 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001658 unregister_hotcpu_notifier(&iucv_cpu_notifier);
1659 percpu_free(iucv_param);
1660 percpu_free(iucv_irq_data);
1661 s390_root_dev_unregister(iucv_root);
1662 bus_unregister(&iucv_bus);
1663 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1664}
1665
1666subsys_initcall(iucv_init);
1667module_exit(iucv_exit);
1668
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001669MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1670MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1671MODULE_LICENSE("GPL");