blob: 531a206ce7a6ee78e4b3e7b00faaa10a7a8809bd [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
Christoph Lameter70cf50352007-11-20 11:13:38 +0100100static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800101static 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 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100280static union iucv_param *iucv_param[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800281
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 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100359 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800360 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. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100380 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800381 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 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200392 * Declare a interrupt buffer on this cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800393 */
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. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100404 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800405 memset(parm, 0, sizeof(union iucv_param));
Christoph Lameter70cf50352007-11-20 11:13:38 +0100406 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800407 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. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100461 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800462 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
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700477 get_online_cpus();
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))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200482 smp_call_function_single(cpu, iucv_allow_cpu,
483 NULL, 0, 1);
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700484 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800485}
486
487/**
488 * iucv_setmask_up
489 *
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700490 * Allow iucv interrupts on a single cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800491 */
492static void iucv_setmask_up(void)
493{
494 cpumask_t cpumask;
495 int cpu;
496
497 /* Disable all cpu but the first in cpu_irq_cpumask. */
498 cpumask = iucv_irq_cpumask;
499 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
500 for_each_cpu_mask(cpu, cpumask)
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200501 smp_call_function_single(cpu, iucv_block_cpu, NULL, 0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800502}
503
504/**
505 * iucv_enable
506 *
507 * This function makes iucv ready for use. It allocates the pathid
508 * table, declares an iucv interrupt buffer and enables the iucv
509 * interrupts. Called when the first user has registered an iucv
510 * handler.
511 */
512static int iucv_enable(void)
513{
514 size_t alloc_size;
515 int cpu, rc;
516
517 rc = -ENOMEM;
518 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
519 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
520 if (!iucv_path_table)
521 goto out;
522 /* Declare per cpu buffers. */
523 rc = -EIO;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700524 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800525 for_each_online_cpu(cpu)
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200526 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
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;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700530 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800531 return 0;
532
533out_path:
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700534 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800535 kfree(iucv_path_table);
536out:
537 return rc;
538}
539
540/**
541 * iucv_disable
542 *
543 * This function shuts down iucv. It disables iucv interrupts, retrieves
544 * the iucv interrupt buffer and frees the pathid table. Called after the
545 * last user unregister its iucv handler.
546 */
547static void iucv_disable(void)
548{
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700549 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800550 on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700551 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800552 kfree(iucv_path_table);
553}
554
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800555static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
556 unsigned long action, void *hcpu)
557{
558 cpumask_t cpumask;
559 long cpu = (long) hcpu;
560
561 switch (action) {
562 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700563 case CPU_UP_PREPARE_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100564 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
565 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
566 if (!iucv_irq_data[cpu])
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800567 return NOTIFY_BAD;
Christoph Lameter70cf50352007-11-20 11:13:38 +0100568 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
569 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
570 if (!iucv_param[cpu])
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800571 return NOTIFY_BAD;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800572 break;
573 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700574 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800575 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700576 case CPU_DEAD_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100577 kfree(iucv_param[cpu]);
578 iucv_param[cpu] = NULL;
579 kfree(iucv_irq_data[cpu]);
580 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800581 break;
582 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700583 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800584 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700585 case CPU_DOWN_FAILED_FROZEN:
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200586 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800587 break;
588 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700589 case CPU_DOWN_PREPARE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800590 cpumask = iucv_buffer_cpumask;
591 cpu_clear(cpu, cpumask);
592 if (cpus_empty(cpumask))
593 /* Can't offline last IUCV enabled cpu. */
594 return NOTIFY_BAD;
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200595 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800596 if (cpus_empty(iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200597 smp_call_function_single(first_cpu(iucv_buffer_cpumask),
598 iucv_allow_cpu, NULL, 0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800599 break;
600 }
601 return NOTIFY_OK;
602}
603
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700604static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800605 .notifier_call = iucv_cpu_notify,
606};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800607
608/**
609 * iucv_sever_pathid
610 * @pathid: path identification number.
611 * @userdata: 16-bytes of user data.
612 *
613 * Sever an iucv path to free up the pathid. Used internally.
614 */
615static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
616{
617 union iucv_param *parm;
618
Christoph Lameter70cf50352007-11-20 11:13:38 +0100619 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800620 memset(parm, 0, sizeof(union iucv_param));
621 if (userdata)
622 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
623 parm->ctrl.ippathid = pathid;
624 return iucv_call_b2f0(IUCV_SEVER, parm);
625}
626
627/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700628 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800629 * @dummy: unused dummy argument
630 *
631 * Nop function called via smp_call_function to force work items from
632 * pending external iucv interrupts to the work queue.
633 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700634static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800635{
636}
637
638/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700639 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800640 *
641 * Function called after a path has been severed to find all remaining
642 * work items for the now stale pathid. The caller needs to hold the
643 * iucv_table_lock.
644 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700645static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800646{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700647 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800648
649 /*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700650 * When a path is severed, the pathid can be reused immediatly
651 * on a iucv connect or a connection pending interrupt. Remove
652 * all entries from the task queue that refer to a stale pathid
653 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
654 * or deliver the connection pending interrupt. To get all the
655 * pending interrupts force them to the work queue by calling
656 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800657 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700658 smp_call_function(__iucv_cleanup_queue, NULL, 0, 1);
659 spin_lock_irq(&iucv_queue_lock);
660 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
661 /* Remove stale work items from the task queue. */
662 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800663 list_del(&p->list);
664 kfree(p);
665 }
666 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700667 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800668}
669
670/**
671 * iucv_register:
672 * @handler: address of iucv handler structure
673 * @smp: != 0 indicates that the handler can deal with out of order messages
674 *
675 * Registers a driver with IUCV.
676 *
677 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
678 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
679 */
680int iucv_register(struct iucv_handler *handler, int smp)
681{
682 int rc;
683
684 if (!iucv_available)
685 return -ENOSYS;
686 mutex_lock(&iucv_register_mutex);
687 if (!smp)
688 iucv_nonsmp_handler++;
689 if (list_empty(&iucv_handler_list)) {
690 rc = iucv_enable();
691 if (rc)
692 goto out_mutex;
693 } else if (!smp && iucv_nonsmp_handler == 1)
694 iucv_setmask_up();
695 INIT_LIST_HEAD(&handler->paths);
696
Ursula Braun435bc9d2008-02-07 18:06:52 -0800697 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800698 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800699 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800700 rc = 0;
701out_mutex:
702 mutex_unlock(&iucv_register_mutex);
703 return rc;
704}
Heiko Carstensda99f052007-05-04 12:23:27 -0700705EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800706
707/**
708 * iucv_unregister
709 * @handler: address of iucv handler structure
710 * @smp: != 0 indicates that the handler can deal with out of order messages
711 *
712 * Unregister driver from IUCV.
713 */
714void iucv_unregister(struct iucv_handler *handler, int smp)
715{
716 struct iucv_path *p, *n;
717
718 mutex_lock(&iucv_register_mutex);
719 spin_lock_bh(&iucv_table_lock);
720 /* Remove handler from the iucv_handler_list. */
721 list_del_init(&handler->list);
722 /* Sever all pathids still refering to the handler. */
723 list_for_each_entry_safe(p, n, &handler->paths, list) {
724 iucv_sever_pathid(p->pathid, NULL);
725 iucv_path_table[p->pathid] = NULL;
726 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800727 iucv_path_free(p);
728 }
729 spin_unlock_bh(&iucv_table_lock);
730 if (!smp)
731 iucv_nonsmp_handler--;
732 if (list_empty(&iucv_handler_list))
733 iucv_disable();
734 else if (!smp && iucv_nonsmp_handler == 0)
735 iucv_setmask_mp();
736 mutex_unlock(&iucv_register_mutex);
737}
Heiko Carstensda99f052007-05-04 12:23:27 -0700738EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800739
740/**
741 * iucv_path_accept
742 * @path: address of iucv path structure
743 * @handler: address of iucv handler structure
744 * @userdata: 16 bytes of data reflected to the communication partner
745 * @private: private data passed to interrupt handlers for this path
746 *
747 * This function is issued after the user received a connection pending
748 * external interrupt and now wishes to complete the IUCV communication path.
749 *
750 * Returns the result of the CP IUCV call.
751 */
752int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
753 u8 userdata[16], void *private)
754{
755 union iucv_param *parm;
756 int rc;
757
758 local_bh_disable();
759 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100760 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800761 memset(parm, 0, sizeof(union iucv_param));
762 parm->ctrl.ippathid = path->pathid;
763 parm->ctrl.ipmsglim = path->msglim;
764 if (userdata)
765 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
766 parm->ctrl.ipflags1 = path->flags;
767
768 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
769 if (!rc) {
770 path->private = private;
771 path->msglim = parm->ctrl.ipmsglim;
772 path->flags = parm->ctrl.ipflags1;
773 }
774 local_bh_enable();
775 return rc;
776}
Heiko Carstensda99f052007-05-04 12:23:27 -0700777EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800778
779/**
780 * iucv_path_connect
781 * @path: address of iucv path structure
782 * @handler: address of iucv handler structure
783 * @userid: 8-byte user identification
784 * @system: 8-byte target system identification
785 * @userdata: 16 bytes of data reflected to the communication partner
786 * @private: private data passed to interrupt handlers for this path
787 *
788 * This function establishes an IUCV path. Although the connect may complete
789 * successfully, you are not able to use the path until you receive an IUCV
790 * Connection Complete external interrupt.
791 *
792 * Returns the result of the CP IUCV call.
793 */
794int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
795 u8 userid[8], u8 system[8], u8 userdata[16],
796 void *private)
797{
798 union iucv_param *parm;
799 int rc;
800
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700801 spin_lock_bh(&iucv_table_lock);
802 iucv_cleanup_queue();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100803 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800804 memset(parm, 0, sizeof(union iucv_param));
805 parm->ctrl.ipmsglim = path->msglim;
806 parm->ctrl.ipflags1 = path->flags;
807 if (userid) {
808 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
809 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
810 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
811 }
812 if (system) {
813 memcpy(parm->ctrl.iptarget, system,
814 sizeof(parm->ctrl.iptarget));
815 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
816 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
817 }
818 if (userdata)
819 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
820
821 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
822 if (!rc) {
823 if (parm->ctrl.ippathid < iucv_max_pathid) {
824 path->pathid = parm->ctrl.ippathid;
825 path->msglim = parm->ctrl.ipmsglim;
826 path->flags = parm->ctrl.ipflags1;
827 path->handler = handler;
828 path->private = private;
829 list_add_tail(&path->list, &handler->paths);
830 iucv_path_table[path->pathid] = path;
831 } else {
832 iucv_sever_pathid(parm->ctrl.ippathid,
833 iucv_error_pathid);
834 rc = -EIO;
835 }
836 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700837 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800838 return rc;
839}
Heiko Carstensda99f052007-05-04 12:23:27 -0700840EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800841
842/**
843 * iucv_path_quiesce:
844 * @path: address of iucv path structure
845 * @userdata: 16 bytes of data reflected to the communication partner
846 *
847 * This function temporarily suspends incoming messages on an IUCV path.
848 * You can later reactivate the path by invoking the iucv_resume function.
849 *
850 * Returns the result from the CP IUCV call.
851 */
852int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
853{
854 union iucv_param *parm;
855 int rc;
856
857 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100858 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800859 memset(parm, 0, sizeof(union iucv_param));
860 if (userdata)
861 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
862 parm->ctrl.ippathid = path->pathid;
863 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
864 local_bh_enable();
865 return rc;
866}
Heiko Carstensda99f052007-05-04 12:23:27 -0700867EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800868
869/**
870 * iucv_path_resume:
871 * @path: address of iucv path structure
872 * @userdata: 16 bytes of data reflected to the communication partner
873 *
874 * This function resumes incoming messages on an IUCV path that has
875 * been stopped with iucv_path_quiesce.
876 *
877 * Returns the result from the CP IUCV call.
878 */
879int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
880{
881 union iucv_param *parm;
882 int rc;
883
884 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100885 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800886 memset(parm, 0, sizeof(union iucv_param));
887 if (userdata)
888 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
889 parm->ctrl.ippathid = path->pathid;
890 rc = iucv_call_b2f0(IUCV_RESUME, parm);
891 local_bh_enable();
892 return rc;
893}
894
895/**
896 * iucv_path_sever
897 * @path: address of iucv path structure
898 * @userdata: 16 bytes of data reflected to the communication partner
899 *
900 * This function terminates an IUCV path.
901 *
902 * Returns the result from the CP IUCV call.
903 */
904int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
905{
906 int rc;
907
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800908 preempt_disable();
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700909 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800910 spin_lock_bh(&iucv_table_lock);
911 rc = iucv_sever_pathid(path->pathid, userdata);
912 if (!rc) {
913 iucv_path_table[path->pathid] = NULL;
914 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800915 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700916 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800917 spin_unlock_bh(&iucv_table_lock);
918 preempt_enable();
919 return rc;
920}
Heiko Carstensda99f052007-05-04 12:23:27 -0700921EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800922
923/**
924 * iucv_message_purge
925 * @path: address of iucv path structure
926 * @msg: address of iucv msg structure
927 * @srccls: source class of message
928 *
929 * Cancels a message you have sent.
930 *
931 * Returns the result from the CP IUCV call.
932 */
933int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
934 u32 srccls)
935{
936 union iucv_param *parm;
937 int rc;
938
939 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100940 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800941 memset(parm, 0, sizeof(union iucv_param));
942 parm->purge.ippathid = path->pathid;
943 parm->purge.ipmsgid = msg->id;
944 parm->purge.ipsrccls = srccls;
945 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
946 rc = iucv_call_b2f0(IUCV_PURGE, parm);
947 if (!rc) {
948 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
949 msg->tag = parm->purge.ipmsgtag;
950 }
951 local_bh_enable();
952 return rc;
953}
Heiko Carstensda99f052007-05-04 12:23:27 -0700954EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800955
956/**
957 * iucv_message_receive
958 * @path: address of iucv path structure
959 * @msg: address of iucv msg structure
960 * @flags: how the message is received (IUCV_IPBUFLST)
961 * @buffer: address of data buffer or address of struct iucv_array
962 * @size: length of data buffer
963 * @residual:
964 *
965 * This function receives messages that are being sent to you over
966 * established paths. This function will deal with RMDATA messages
967 * embedded in struct iucv_message as well.
968 *
969 * Returns the result from the CP IUCV call.
970 */
971int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
972 u8 flags, void *buffer, size_t size, size_t *residual)
973{
974 union iucv_param *parm;
975 struct iucv_array *array;
976 u8 *rmmsg;
977 size_t copy;
978 int rc;
979
980 if (msg->flags & IUCV_IPRMDATA) {
981 /*
982 * Message is 8 bytes long and has been stored to the
983 * message descriptor itself.
984 */
985 rc = (size < 8) ? 5 : 0;
986 if (residual)
987 *residual = abs(size - 8);
988 rmmsg = msg->rmmsg;
989 if (flags & IUCV_IPBUFLST) {
990 /* Copy to struct iucv_array. */
991 size = (size < 8) ? size : 8;
992 for (array = buffer; size > 0; array++) {
993 copy = min_t(size_t, size, array->length);
994 memcpy((u8 *)(addr_t) array->address,
995 rmmsg, copy);
996 rmmsg += copy;
997 size -= copy;
998 }
999 } else {
1000 /* Copy to direct buffer. */
1001 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1002 }
1003 return 0;
1004 }
1005
1006 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001007 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001008 memset(parm, 0, sizeof(union iucv_param));
1009 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1010 parm->db.ipbfln1f = (u32) size;
1011 parm->db.ipmsgid = msg->id;
1012 parm->db.ippathid = path->pathid;
1013 parm->db.iptrgcls = msg->class;
1014 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1015 IUCV_IPFGMID | IUCV_IPTRGCLS);
1016 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1017 if (!rc || rc == 5) {
1018 msg->flags = parm->db.ipflags1;
1019 if (residual)
1020 *residual = parm->db.ipbfln1f;
1021 }
1022 local_bh_enable();
1023 return rc;
1024}
Heiko Carstensda99f052007-05-04 12:23:27 -07001025EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001026
1027/**
1028 * iucv_message_reject
1029 * @path: address of iucv path structure
1030 * @msg: address of iucv msg structure
1031 *
1032 * The reject function refuses a specified message. Between the time you
1033 * are notified of a message and the time that you complete the message,
1034 * the message may be rejected.
1035 *
1036 * Returns the result from the CP IUCV call.
1037 */
1038int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1039{
1040 union iucv_param *parm;
1041 int rc;
1042
1043 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001044 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001045 memset(parm, 0, sizeof(union iucv_param));
1046 parm->db.ippathid = path->pathid;
1047 parm->db.ipmsgid = msg->id;
1048 parm->db.iptrgcls = msg->class;
1049 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1050 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1051 local_bh_enable();
1052 return rc;
1053}
Heiko Carstensda99f052007-05-04 12:23:27 -07001054EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001055
1056/**
1057 * iucv_message_reply
1058 * @path: address of iucv path structure
1059 * @msg: address of iucv msg structure
1060 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1061 * @reply: address of reply data buffer or address of struct iucv_array
1062 * @size: length of reply data buffer
1063 *
1064 * This function responds to the two-way messages that you receive. You
1065 * must identify completely the message to which you wish to reply. ie,
1066 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1067 * the parameter list.
1068 *
1069 * Returns the result from the CP IUCV call.
1070 */
1071int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1072 u8 flags, void *reply, size_t size)
1073{
1074 union iucv_param *parm;
1075 int rc;
1076
1077 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001078 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001079 memset(parm, 0, sizeof(union iucv_param));
1080 if (flags & IUCV_IPRMDATA) {
1081 parm->dpl.ippathid = path->pathid;
1082 parm->dpl.ipflags1 = flags;
1083 parm->dpl.ipmsgid = msg->id;
1084 parm->dpl.iptrgcls = msg->class;
1085 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1086 } else {
1087 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1088 parm->db.ipbfln1f = (u32) size;
1089 parm->db.ippathid = path->pathid;
1090 parm->db.ipflags1 = flags;
1091 parm->db.ipmsgid = msg->id;
1092 parm->db.iptrgcls = msg->class;
1093 }
1094 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1095 local_bh_enable();
1096 return rc;
1097}
Heiko Carstensda99f052007-05-04 12:23:27 -07001098EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001099
1100/**
1101 * iucv_message_send
1102 * @path: address of iucv path structure
1103 * @msg: address of iucv msg structure
1104 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1105 * @srccls: source class of message
1106 * @buffer: address of send buffer or address of struct iucv_array
1107 * @size: length of send buffer
1108 *
1109 * This function transmits data to another application. Data to be
1110 * transmitted is in a buffer and this is a one-way message and the
1111 * receiver will not reply to the message.
1112 *
1113 * Returns the result from the CP IUCV call.
1114 */
1115int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1116 u8 flags, u32 srccls, void *buffer, size_t size)
1117{
1118 union iucv_param *parm;
1119 int rc;
1120
1121 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001122 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001123 memset(parm, 0, sizeof(union iucv_param));
1124 if (flags & IUCV_IPRMDATA) {
1125 /* Message of 8 bytes can be placed into the parameter list. */
1126 parm->dpl.ippathid = path->pathid;
1127 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1128 parm->dpl.iptrgcls = msg->class;
1129 parm->dpl.ipsrccls = srccls;
1130 parm->dpl.ipmsgtag = msg->tag;
1131 memcpy(parm->dpl.iprmmsg, buffer, 8);
1132 } else {
1133 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1134 parm->db.ipbfln1f = (u32) size;
1135 parm->db.ippathid = path->pathid;
1136 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1137 parm->db.iptrgcls = msg->class;
1138 parm->db.ipsrccls = srccls;
1139 parm->db.ipmsgtag = msg->tag;
1140 }
1141 rc = iucv_call_b2f0(IUCV_SEND, parm);
1142 if (!rc)
1143 msg->id = parm->db.ipmsgid;
1144 local_bh_enable();
1145 return rc;
1146}
Heiko Carstensda99f052007-05-04 12:23:27 -07001147EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001148
1149/**
1150 * iucv_message_send2way
1151 * @path: address of iucv path structure
1152 * @msg: address of iucv msg structure
1153 * @flags: how the message is sent and the reply is received
1154 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1155 * @srccls: source class of message
1156 * @buffer: address of send buffer or address of struct iucv_array
1157 * @size: length of send buffer
1158 * @ansbuf: address of answer buffer or address of struct iucv_array
1159 * @asize: size of reply buffer
1160 *
1161 * This function transmits data to another application. Data to be
1162 * transmitted is in a buffer. The receiver of the send is expected to
1163 * reply to the message and a buffer is provided into which IUCV moves
1164 * the reply to this message.
1165 *
1166 * Returns the result from the CP IUCV call.
1167 */
1168int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1169 u8 flags, u32 srccls, void *buffer, size_t size,
1170 void *answer, size_t asize, size_t *residual)
1171{
1172 union iucv_param *parm;
1173 int rc;
1174
1175 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001176 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001177 memset(parm, 0, sizeof(union iucv_param));
1178 if (flags & IUCV_IPRMDATA) {
1179 parm->dpl.ippathid = path->pathid;
1180 parm->dpl.ipflags1 = path->flags; /* priority message */
1181 parm->dpl.iptrgcls = msg->class;
1182 parm->dpl.ipsrccls = srccls;
1183 parm->dpl.ipmsgtag = msg->tag;
1184 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1185 parm->dpl.ipbfln2f = (u32) asize;
1186 memcpy(parm->dpl.iprmmsg, buffer, 8);
1187 } else {
1188 parm->db.ippathid = path->pathid;
1189 parm->db.ipflags1 = path->flags; /* priority message */
1190 parm->db.iptrgcls = msg->class;
1191 parm->db.ipsrccls = srccls;
1192 parm->db.ipmsgtag = msg->tag;
1193 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1194 parm->db.ipbfln1f = (u32) size;
1195 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1196 parm->db.ipbfln2f = (u32) asize;
1197 }
1198 rc = iucv_call_b2f0(IUCV_SEND, parm);
1199 if (!rc)
1200 msg->id = parm->db.ipmsgid;
1201 local_bh_enable();
1202 return rc;
1203}
Heiko Carstensda99f052007-05-04 12:23:27 -07001204EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001205
1206/**
1207 * iucv_path_pending
1208 * @data: Pointer to external interrupt buffer
1209 *
1210 * Process connection pending work item. Called from tasklet while holding
1211 * iucv_table_lock.
1212 */
1213struct iucv_path_pending {
1214 u16 ippathid;
1215 u8 ipflags1;
1216 u8 iptype;
1217 u16 ipmsglim;
1218 u16 res1;
1219 u8 ipvmid[8];
1220 u8 ipuser[16];
1221 u32 res3;
1222 u8 ippollfg;
1223 u8 res4[3];
1224} __attribute__ ((packed));
1225
1226static void iucv_path_pending(struct iucv_irq_data *data)
1227{
1228 struct iucv_path_pending *ipp = (void *) data;
1229 struct iucv_handler *handler;
1230 struct iucv_path *path;
1231 char *error;
1232
1233 BUG_ON(iucv_path_table[ipp->ippathid]);
1234 /* New pathid, handler found. Create a new path struct. */
1235 error = iucv_error_no_memory;
1236 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1237 if (!path)
1238 goto out_sever;
1239 path->pathid = ipp->ippathid;
1240 iucv_path_table[path->pathid] = path;
1241 EBCASC(ipp->ipvmid, 8);
1242
1243 /* Call registered handler until one is found that wants the path. */
1244 list_for_each_entry(handler, &iucv_handler_list, list) {
1245 if (!handler->path_pending)
1246 continue;
1247 /*
1248 * Add path to handler to allow a call to iucv_path_sever
1249 * inside the path_pending function. If the handler returns
1250 * an error remove the path from the handler again.
1251 */
1252 list_add(&path->list, &handler->paths);
1253 path->handler = handler;
1254 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1255 return;
1256 list_del(&path->list);
1257 path->handler = NULL;
1258 }
1259 /* No handler wanted the path. */
1260 iucv_path_table[path->pathid] = NULL;
1261 iucv_path_free(path);
1262 error = iucv_error_no_listener;
1263out_sever:
1264 iucv_sever_pathid(ipp->ippathid, error);
1265}
1266
1267/**
1268 * iucv_path_complete
1269 * @data: Pointer to external interrupt buffer
1270 *
1271 * Process connection complete work item. Called from tasklet while holding
1272 * iucv_table_lock.
1273 */
1274struct iucv_path_complete {
1275 u16 ippathid;
1276 u8 ipflags1;
1277 u8 iptype;
1278 u16 ipmsglim;
1279 u16 res1;
1280 u8 res2[8];
1281 u8 ipuser[16];
1282 u32 res3;
1283 u8 ippollfg;
1284 u8 res4[3];
1285} __attribute__ ((packed));
1286
1287static void iucv_path_complete(struct iucv_irq_data *data)
1288{
1289 struct iucv_path_complete *ipc = (void *) data;
1290 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1291
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001292 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001293 path->handler->path_complete(path, ipc->ipuser);
1294}
1295
1296/**
1297 * iucv_path_severed
1298 * @data: Pointer to external interrupt buffer
1299 *
1300 * Process connection severed work item. Called from tasklet while holding
1301 * iucv_table_lock.
1302 */
1303struct iucv_path_severed {
1304 u16 ippathid;
1305 u8 res1;
1306 u8 iptype;
1307 u32 res2;
1308 u8 res3[8];
1309 u8 ipuser[16];
1310 u32 res4;
1311 u8 ippollfg;
1312 u8 res5[3];
1313} __attribute__ ((packed));
1314
1315static void iucv_path_severed(struct iucv_irq_data *data)
1316{
1317 struct iucv_path_severed *ips = (void *) data;
1318 struct iucv_path *path = iucv_path_table[ips->ippathid];
1319
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001320 if (!path || !path->handler) /* Already severed */
1321 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001322 if (path->handler->path_severed)
1323 path->handler->path_severed(path, ips->ipuser);
1324 else {
1325 iucv_sever_pathid(path->pathid, NULL);
1326 iucv_path_table[path->pathid] = NULL;
1327 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001328 iucv_path_free(path);
1329 }
1330}
1331
1332/**
1333 * iucv_path_quiesced
1334 * @data: Pointer to external interrupt buffer
1335 *
1336 * Process connection quiesced work item. Called from tasklet while holding
1337 * iucv_table_lock.
1338 */
1339struct iucv_path_quiesced {
1340 u16 ippathid;
1341 u8 res1;
1342 u8 iptype;
1343 u32 res2;
1344 u8 res3[8];
1345 u8 ipuser[16];
1346 u32 res4;
1347 u8 ippollfg;
1348 u8 res5[3];
1349} __attribute__ ((packed));
1350
1351static void iucv_path_quiesced(struct iucv_irq_data *data)
1352{
1353 struct iucv_path_quiesced *ipq = (void *) data;
1354 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1355
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001356 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001357 path->handler->path_quiesced(path, ipq->ipuser);
1358}
1359
1360/**
1361 * iucv_path_resumed
1362 * @data: Pointer to external interrupt buffer
1363 *
1364 * Process connection resumed work item. Called from tasklet while holding
1365 * iucv_table_lock.
1366 */
1367struct iucv_path_resumed {
1368 u16 ippathid;
1369 u8 res1;
1370 u8 iptype;
1371 u32 res2;
1372 u8 res3[8];
1373 u8 ipuser[16];
1374 u32 res4;
1375 u8 ippollfg;
1376 u8 res5[3];
1377} __attribute__ ((packed));
1378
1379static void iucv_path_resumed(struct iucv_irq_data *data)
1380{
1381 struct iucv_path_resumed *ipr = (void *) data;
1382 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1383
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001384 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001385 path->handler->path_resumed(path, ipr->ipuser);
1386}
1387
1388/**
1389 * iucv_message_complete
1390 * @data: Pointer to external interrupt buffer
1391 *
1392 * Process message complete work item. Called from tasklet while holding
1393 * iucv_table_lock.
1394 */
1395struct iucv_message_complete {
1396 u16 ippathid;
1397 u8 ipflags1;
1398 u8 iptype;
1399 u32 ipmsgid;
1400 u32 ipaudit;
1401 u8 iprmmsg[8];
1402 u32 ipsrccls;
1403 u32 ipmsgtag;
1404 u32 res;
1405 u32 ipbfln2f;
1406 u8 ippollfg;
1407 u8 res2[3];
1408} __attribute__ ((packed));
1409
1410static void iucv_message_complete(struct iucv_irq_data *data)
1411{
1412 struct iucv_message_complete *imc = (void *) data;
1413 struct iucv_path *path = iucv_path_table[imc->ippathid];
1414 struct iucv_message msg;
1415
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001416 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001417 msg.flags = imc->ipflags1;
1418 msg.id = imc->ipmsgid;
1419 msg.audit = imc->ipaudit;
1420 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1421 msg.class = imc->ipsrccls;
1422 msg.tag = imc->ipmsgtag;
1423 msg.length = imc->ipbfln2f;
1424 path->handler->message_complete(path, &msg);
1425 }
1426}
1427
1428/**
1429 * iucv_message_pending
1430 * @data: Pointer to external interrupt buffer
1431 *
1432 * Process message pending work item. Called from tasklet while holding
1433 * iucv_table_lock.
1434 */
1435struct iucv_message_pending {
1436 u16 ippathid;
1437 u8 ipflags1;
1438 u8 iptype;
1439 u32 ipmsgid;
1440 u32 iptrgcls;
1441 union {
1442 u32 iprmmsg1_u32;
1443 u8 iprmmsg1[4];
1444 } ln1msg1;
1445 union {
1446 u32 ipbfln1f;
1447 u8 iprmmsg2[4];
1448 } ln1msg2;
1449 u32 res1[3];
1450 u32 ipbfln2f;
1451 u8 ippollfg;
1452 u8 res2[3];
1453} __attribute__ ((packed));
1454
1455static void iucv_message_pending(struct iucv_irq_data *data)
1456{
1457 struct iucv_message_pending *imp = (void *) data;
1458 struct iucv_path *path = iucv_path_table[imp->ippathid];
1459 struct iucv_message msg;
1460
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001461 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001462 msg.flags = imp->ipflags1;
1463 msg.id = imp->ipmsgid;
1464 msg.class = imp->iptrgcls;
1465 if (imp->ipflags1 & IUCV_IPRMDATA) {
1466 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1467 msg.length = 8;
1468 } else
1469 msg.length = imp->ln1msg2.ipbfln1f;
1470 msg.reply_size = imp->ipbfln2f;
1471 path->handler->message_pending(path, &msg);
1472 }
1473}
1474
1475/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001476 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001477 *
1478 * This tasklet loops over the queue of irq buffers created by
1479 * iucv_external_interrupt, calls the appropriate action handler
1480 * and then frees the buffer.
1481 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001482static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001483{
1484 typedef void iucv_irq_fn(struct iucv_irq_data *);
1485 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001486 [0x02] = iucv_path_complete,
1487 [0x03] = iucv_path_severed,
1488 [0x04] = iucv_path_quiesced,
1489 [0x05] = iucv_path_resumed,
1490 [0x06] = iucv_message_complete,
1491 [0x07] = iucv_message_complete,
1492 [0x08] = iucv_message_pending,
1493 [0x09] = iucv_message_pending,
1494 };
Denis Chengb5e78332007-12-07 00:51:45 -08001495 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001496 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001497
1498 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001499 if (!spin_trylock(&iucv_table_lock)) {
1500 tasklet_schedule(&iucv_tasklet);
1501 return;
1502 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001503 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001504
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001505 spin_lock_irq(&iucv_queue_lock);
1506 list_splice_init(&iucv_task_queue, &task_queue);
1507 spin_unlock_irq(&iucv_queue_lock);
1508
1509 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001510 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001511 irq_fn[p->data.iptype](&p->data);
1512 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001513 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001514
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001515 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001516 spin_unlock(&iucv_table_lock);
1517}
1518
1519/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001520 * iucv_work_fn:
1521 *
1522 * This work function loops over the queue of path pending irq blocks
1523 * created by iucv_external_interrupt, calls the appropriate action
1524 * handler and then frees the buffer.
1525 */
1526static void iucv_work_fn(struct work_struct *work)
1527{
1528 typedef void iucv_irq_fn(struct iucv_irq_data *);
Denis Chengb5e78332007-12-07 00:51:45 -08001529 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001530 struct iucv_irq_list *p, *n;
1531
1532 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1533 spin_lock_bh(&iucv_table_lock);
1534 iucv_active_cpu = smp_processor_id();
1535
1536 spin_lock_irq(&iucv_queue_lock);
1537 list_splice_init(&iucv_work_queue, &work_queue);
1538 spin_unlock_irq(&iucv_queue_lock);
1539
1540 iucv_cleanup_queue();
1541 list_for_each_entry_safe(p, n, &work_queue, list) {
1542 list_del_init(&p->list);
1543 iucv_path_pending(&p->data);
1544 kfree(p);
1545 }
1546
1547 iucv_active_cpu = -1;
1548 spin_unlock_bh(&iucv_table_lock);
1549}
1550
1551/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001552 * iucv_external_interrupt
1553 * @code: irq code
1554 *
1555 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001556 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001557 */
1558static void iucv_external_interrupt(u16 code)
1559{
1560 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001561 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001562
Christoph Lameter70cf50352007-11-20 11:13:38 +01001563 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001564 if (p->ippathid >= iucv_max_pathid) {
1565 printk(KERN_WARNING "iucv_do_int: Got interrupt with "
1566 "pathid %d > max_connections (%ld)\n",
1567 p->ippathid, iucv_max_pathid - 1);
1568 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1569 return;
1570 }
1571 if (p->iptype < 0x01 || p->iptype > 0x09) {
1572 printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
1573 return;
1574 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001575 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001576 if (!work) {
1577 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1578 return;
1579 }
1580 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001581 spin_lock(&iucv_queue_lock);
1582 if (p->iptype == 0x01) {
1583 /* Path pending interrupt. */
1584 list_add_tail(&work->list, &iucv_work_queue);
1585 schedule_work(&iucv_work);
1586 } else {
1587 /* The other interrupts. */
1588 list_add_tail(&work->list, &iucv_task_queue);
1589 tasklet_schedule(&iucv_tasklet);
1590 }
1591 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001592}
1593
1594/**
1595 * iucv_init
1596 *
1597 * Allocates and initializes various data structures.
1598 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001599static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001600{
1601 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001602 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001603
1604 if (!MACHINE_IS_VM) {
1605 rc = -EPROTONOSUPPORT;
1606 goto out;
1607 }
1608 rc = iucv_query_maxconn();
1609 if (rc)
1610 goto out;
Heiko Carstensda99f052007-05-04 12:23:27 -07001611 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001612 if (rc)
1613 goto out;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001614 iucv_root = s390_root_dev_register("iucv");
1615 if (IS_ERR(iucv_root)) {
1616 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001617 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001618 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001619
1620 for_each_online_cpu(cpu) {
1621 /* Note: GFP_DMA used to get memory below 2G */
1622 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1623 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1624 if (!iucv_irq_data[cpu]) {
1625 rc = -ENOMEM;
1626 goto out_free;
1627 }
1628
1629 /* Allocate parameter blocks. */
1630 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1631 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1632 if (!iucv_param[cpu]) {
1633 rc = -ENOMEM;
1634 goto out_free;
1635 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001636 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001637 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1638 if (rc)
1639 goto out_free;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001640 ASCEBC(iucv_error_no_listener, 16);
1641 ASCEBC(iucv_error_no_memory, 16);
1642 ASCEBC(iucv_error_pathid, 16);
1643 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001644 rc = bus_register(&iucv_bus);
1645 if (rc)
1646 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001647 return 0;
1648
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001649out_cpu:
1650 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001651out_free:
1652 for_each_possible_cpu(cpu) {
1653 kfree(iucv_param[cpu]);
1654 iucv_param[cpu] = NULL;
1655 kfree(iucv_irq_data[cpu]);
1656 iucv_irq_data[cpu] = NULL;
1657 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001658 s390_root_dev_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001659out_int:
1660 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1661out:
1662 return rc;
1663}
1664
1665/**
1666 * iucv_exit
1667 *
1668 * Frees everything allocated from iucv_init.
1669 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001670static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001671{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001672 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001673 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001674
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001675 spin_lock_irq(&iucv_queue_lock);
1676 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1677 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001678 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1679 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001680 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001681 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001682 for_each_possible_cpu(cpu) {
1683 kfree(iucv_param[cpu]);
1684 iucv_param[cpu] = NULL;
1685 kfree(iucv_irq_data[cpu]);
1686 iucv_irq_data[cpu] = NULL;
1687 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001688 s390_root_dev_unregister(iucv_root);
1689 bus_unregister(&iucv_bus);
1690 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1691}
1692
1693subsys_initcall(iucv_init);
1694module_exit(iucv_exit);
1695
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001696MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1697MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1698MODULE_LICENSE("GPL");