blob: f7db676de77d7568b463df2b8a7db770a0f090e7 [file] [log] [blame]
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001/*
2 * IUCV base infrastructure.
3 *
Ursula Braun6c005962009-06-16 10:30:41 +02004 * Copyright IBM Corp. 2001, 2009
5 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08006 * Author(s):
7 * Original source:
8 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
9 * Xenia Tkatschow (xenia@us.ibm.com)
10 * 2Gb awareness and general cleanup:
11 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
12 * Rewritten for af_iucv:
13 * Martin Schwidefsky <schwidefsky@de.ibm.com>
Ursula Braun672e4052009-06-16 10:30:42 +020014 * PM functions:
15 * Ursula Braun (ursula.braun@de.ibm.com)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080016 *
17 * Documentation used:
18 * The original source
19 * CP Programming Service, IBM document # SC24-5760
20 *
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2, or (at your option)
24 * any later version.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 */
35
Ursula Braun8f7c5022008-12-25 13:39:47 +010036#define KMSG_COMPONENT "iucv"
37#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
38
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080039#include <linux/module.h>
40#include <linux/moduleparam.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080041#include <linux/spinlock.h>
42#include <linux/kernel.h>
43#include <linux/slab.h>
44#include <linux/init.h>
45#include <linux/interrupt.h>
46#include <linux/list.h>
47#include <linux/errno.h>
48#include <linux/err.h>
49#include <linux/device.h>
50#include <linux/cpu.h>
Ursula Braun6c005962009-06-16 10:30:41 +020051#include <linux/reboot.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080052#include <net/iucv/iucv.h>
53#include <asm/atomic.h>
54#include <asm/ebcdic.h>
55#include <asm/io.h>
56#include <asm/s390_ext.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080057#include <asm/smp.h>
58
59/*
60 * FLAGS:
61 * All flags are defined in the field IPFLAGS1 of each function
62 * and can be found in CP Programming Services.
63 * IPSRCCLS - Indicates you have specified a source class.
64 * IPTRGCLS - Indicates you have specified a target class.
65 * IPFGPID - Indicates you have specified a pathid.
66 * IPFGMID - Indicates you have specified a message ID.
67 * IPNORPY - Indicates a one-way message. No reply expected.
68 * IPALL - Indicates that all paths are affected.
69 */
70#define IUCV_IPSRCCLS 0x01
71#define IUCV_IPTRGCLS 0x01
72#define IUCV_IPFGPID 0x02
73#define IUCV_IPFGMID 0x04
74#define IUCV_IPNORPY 0x10
75#define IUCV_IPALL 0x80
76
Heiko Carstensda99f052007-05-04 12:23:27 -070077static int iucv_bus_match(struct device *dev, struct device_driver *drv)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080078{
79 return 0;
80}
81
Ursula Braun4c89d862009-09-16 04:37:22 +000082enum iucv_pm_states {
83 IUCV_PM_INITIAL = 0,
84 IUCV_PM_FREEZING = 1,
85 IUCV_PM_THAWING = 2,
86 IUCV_PM_RESTORING = 3,
87};
88static enum iucv_pm_states iucv_pm_state;
89
Ursula Braun672e4052009-06-16 10:30:42 +020090static int iucv_pm_prepare(struct device *);
91static void iucv_pm_complete(struct device *);
92static int iucv_pm_freeze(struct device *);
93static int iucv_pm_thaw(struct device *);
94static int iucv_pm_restore(struct device *);
95
Alexey Dobriyan47145212009-12-14 18:00:08 -080096static const struct dev_pm_ops iucv_pm_ops = {
Ursula Braun672e4052009-06-16 10:30:42 +020097 .prepare = iucv_pm_prepare,
98 .complete = iucv_pm_complete,
99 .freeze = iucv_pm_freeze,
100 .thaw = iucv_pm_thaw,
101 .restore = iucv_pm_restore,
102};
103
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800104struct bus_type iucv_bus = {
105 .name = "iucv",
106 .match = iucv_bus_match,
Ursula Braun672e4052009-06-16 10:30:42 +0200107 .pm = &iucv_pm_ops,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800108};
Heiko Carstensda99f052007-05-04 12:23:27 -0700109EXPORT_SYMBOL(iucv_bus);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800110
111struct device *iucv_root;
Heiko Carstensda99f052007-05-04 12:23:27 -0700112EXPORT_SYMBOL(iucv_root);
113
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800114static int iucv_available;
115
116/* General IUCV interrupt structure */
117struct iucv_irq_data {
118 u16 ippathid;
119 u8 ipflags1;
120 u8 iptype;
121 u32 res2[8];
122};
123
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700124struct iucv_irq_list {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800125 struct list_head list;
126 struct iucv_irq_data data;
127};
128
Christoph Lameter70cf50352007-11-20 11:13:38 +0100129static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800130static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
131static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
132
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700133/*
134 * Queue of interrupt buffers lock for delivery via the tasklet
135 * (fast but can't call smp_call_function).
136 */
137static LIST_HEAD(iucv_task_queue);
138
139/*
140 * The tasklet for fast delivery of iucv interrupts.
141 */
142static void iucv_tasklet_fn(unsigned long);
143static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
144
145/*
146 * Queue of interrupt buffers for delivery via a work queue
147 * (slower but can call smp_call_function).
148 */
149static LIST_HEAD(iucv_work_queue);
150
151/*
152 * The work element to deliver path pending interrupts.
153 */
154static void iucv_work_fn(struct work_struct *work);
155static DECLARE_WORK(iucv_work, iucv_work_fn);
156
157/*
158 * Spinlock protecting task and work queue.
159 */
160static DEFINE_SPINLOCK(iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800161
162enum iucv_command_codes {
163 IUCV_QUERY = 0,
164 IUCV_RETRIEVE_BUFFER = 2,
165 IUCV_SEND = 4,
166 IUCV_RECEIVE = 5,
167 IUCV_REPLY = 6,
168 IUCV_REJECT = 8,
169 IUCV_PURGE = 9,
170 IUCV_ACCEPT = 10,
171 IUCV_CONNECT = 11,
172 IUCV_DECLARE_BUFFER = 12,
173 IUCV_QUIESCE = 13,
174 IUCV_RESUME = 14,
175 IUCV_SEVER = 15,
176 IUCV_SETMASK = 16,
Ursula Braun672e4052009-06-16 10:30:42 +0200177 IUCV_SETCONTROLMASK = 17,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800178};
179
180/*
181 * Error messages that are used with the iucv_sever function. They get
182 * converted to EBCDIC.
183 */
184static char iucv_error_no_listener[16] = "NO LISTENER";
185static char iucv_error_no_memory[16] = "NO MEMORY";
186static char iucv_error_pathid[16] = "INVALID PATHID";
187
188/*
189 * iucv_handler_list: List of registered handlers.
190 */
191static LIST_HEAD(iucv_handler_list);
192
193/*
194 * iucv_path_table: an array of iucv_path structures.
195 */
196static struct iucv_path **iucv_path_table;
197static unsigned long iucv_max_pathid;
198
199/*
200 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
201 */
202static DEFINE_SPINLOCK(iucv_table_lock);
203
204/*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700205 * iucv_active_cpu: contains the number of the cpu executing the tasklet
206 * or the work handler. Needed for iucv_path_sever called from tasklet.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800207 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700208static int iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800209
210/*
211 * Mutex and wait queue for iucv_register/iucv_unregister.
212 */
213static DEFINE_MUTEX(iucv_register_mutex);
214
215/*
216 * Counter for number of non-smp capable handlers.
217 */
218static int iucv_nonsmp_handler;
219
220/*
221 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
222 * iucv_path_quiesce and iucv_path_sever.
223 */
224struct iucv_cmd_control {
225 u16 ippathid;
226 u8 ipflags1;
227 u8 iprcode;
228 u16 ipmsglim;
229 u16 res1;
230 u8 ipvmid[8];
231 u8 ipuser[16];
232 u8 iptarget[8];
233} __attribute__ ((packed,aligned(8)));
234
235/*
236 * Data in parameter list iucv structure. Used by iucv_message_send,
237 * iucv_message_send2way and iucv_message_reply.
238 */
239struct iucv_cmd_dpl {
240 u16 ippathid;
241 u8 ipflags1;
242 u8 iprcode;
243 u32 ipmsgid;
244 u32 iptrgcls;
245 u8 iprmmsg[8];
246 u32 ipsrccls;
247 u32 ipmsgtag;
248 u32 ipbfadr2;
249 u32 ipbfln2f;
250 u32 res;
251} __attribute__ ((packed,aligned(8)));
252
253/*
254 * Data in buffer iucv structure. Used by iucv_message_receive,
255 * iucv_message_reject, iucv_message_send, iucv_message_send2way
256 * and iucv_declare_cpu.
257 */
258struct iucv_cmd_db {
259 u16 ippathid;
260 u8 ipflags1;
261 u8 iprcode;
262 u32 ipmsgid;
263 u32 iptrgcls;
264 u32 ipbfadr1;
265 u32 ipbfln1f;
266 u32 ipsrccls;
267 u32 ipmsgtag;
268 u32 ipbfadr2;
269 u32 ipbfln2f;
270 u32 res;
271} __attribute__ ((packed,aligned(8)));
272
273/*
274 * Purge message iucv structure. Used by iucv_message_purge.
275 */
276struct iucv_cmd_purge {
277 u16 ippathid;
278 u8 ipflags1;
279 u8 iprcode;
280 u32 ipmsgid;
281 u8 ipaudit[3];
282 u8 res1[5];
283 u32 res2;
284 u32 ipsrccls;
285 u32 ipmsgtag;
286 u32 res3[3];
287} __attribute__ ((packed,aligned(8)));
288
289/*
290 * Set mask iucv structure. Used by iucv_enable_cpu.
291 */
292struct iucv_cmd_set_mask {
293 u8 ipmask;
294 u8 res1[2];
295 u8 iprcode;
296 u32 res2[9];
297} __attribute__ ((packed,aligned(8)));
298
299union iucv_param {
300 struct iucv_cmd_control ctrl;
301 struct iucv_cmd_dpl dpl;
302 struct iucv_cmd_db db;
303 struct iucv_cmd_purge purge;
304 struct iucv_cmd_set_mask set_mask;
305};
306
307/*
308 * Anchor for per-cpu IUCV command parameter block.
309 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100310static union iucv_param *iucv_param[NR_CPUS];
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000311static union iucv_param *iucv_param_irq[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800312
313/**
314 * iucv_call_b2f0
315 * @code: identifier of IUCV call to CP.
316 * @parm: pointer to a struct iucv_parm block
317 *
318 * Calls CP to execute IUCV commands.
319 *
320 * Returns the result of the CP IUCV call.
321 */
322static inline int iucv_call_b2f0(int command, union iucv_param *parm)
323{
324 register unsigned long reg0 asm ("0");
325 register unsigned long reg1 asm ("1");
326 int ccode;
327
328 reg0 = command;
329 reg1 = virt_to_phys(parm);
330 asm volatile(
331 " .long 0xb2f01000\n"
332 " ipm %0\n"
333 " srl %0,28\n"
334 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
335 : "m" (*parm) : "cc");
336 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
337}
338
339/**
340 * iucv_query_maxconn
341 *
342 * Determines the maximum number of connections that may be established.
343 *
344 * Returns the maximum number of connections or -EPERM is IUCV is not
345 * available.
346 */
347static int iucv_query_maxconn(void)
348{
349 register unsigned long reg0 asm ("0");
350 register unsigned long reg1 asm ("1");
351 void *param;
352 int ccode;
353
354 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
355 if (!param)
356 return -ENOMEM;
357 reg0 = IUCV_QUERY;
358 reg1 = (unsigned long) param;
359 asm volatile (
360 " .long 0xb2f01000\n"
361 " ipm %0\n"
362 " srl %0,28\n"
363 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
364 if (ccode == 0)
Hendrik Bruecknerb29e4da2009-09-16 04:37:24 +0000365 iucv_max_pathid = reg1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800366 kfree(param);
367 return ccode ? -EPERM : 0;
368}
369
370/**
371 * iucv_allow_cpu
372 * @data: unused
373 *
374 * Allow iucv interrupts on this cpu.
375 */
376static void iucv_allow_cpu(void *data)
377{
378 int cpu = smp_processor_id();
379 union iucv_param *parm;
380
381 /*
382 * Enable all iucv interrupts.
383 * ipmask contains bits for the different interrupts
384 * 0x80 - Flag to allow nonpriority message pending interrupts
385 * 0x40 - Flag to allow priority message pending interrupts
386 * 0x20 - Flag to allow nonpriority message completion interrupts
387 * 0x10 - Flag to allow priority message completion interrupts
388 * 0x08 - Flag to allow IUCV control interrupts
389 */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000390 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800391 memset(parm, 0, sizeof(union iucv_param));
392 parm->set_mask.ipmask = 0xf8;
393 iucv_call_b2f0(IUCV_SETMASK, parm);
394
Ursula Braun672e4052009-06-16 10:30:42 +0200395 /*
396 * Enable all iucv control interrupts.
397 * ipmask contains bits for the different interrupts
398 * 0x80 - Flag to allow pending connections interrupts
399 * 0x40 - Flag to allow connection complete interrupts
400 * 0x20 - Flag to allow connection severed interrupts
401 * 0x10 - Flag to allow connection quiesced interrupts
402 * 0x08 - Flag to allow connection resumed interrupts
403 */
404 memset(parm, 0, sizeof(union iucv_param));
405 parm->set_mask.ipmask = 0xf8;
406 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800407 /* Set indication that iucv interrupts are allowed for this cpu. */
408 cpu_set(cpu, iucv_irq_cpumask);
409}
410
411/**
412 * iucv_block_cpu
413 * @data: unused
414 *
415 * Block iucv interrupts on this cpu.
416 */
417static void iucv_block_cpu(void *data)
418{
419 int cpu = smp_processor_id();
420 union iucv_param *parm;
421
422 /* Disable all iucv interrupts. */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000423 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800424 memset(parm, 0, sizeof(union iucv_param));
425 iucv_call_b2f0(IUCV_SETMASK, parm);
426
427 /* Clear indication that iucv interrupts are allowed for this cpu. */
428 cpu_clear(cpu, iucv_irq_cpumask);
429}
430
431/**
Ursula Braun672e4052009-06-16 10:30:42 +0200432 * iucv_block_cpu_almost
433 * @data: unused
434 *
435 * Allow connection-severed interrupts only on this cpu.
436 */
437static void iucv_block_cpu_almost(void *data)
438{
439 int cpu = smp_processor_id();
440 union iucv_param *parm;
441
442 /* Allow iucv control interrupts only */
443 parm = iucv_param_irq[cpu];
444 memset(parm, 0, sizeof(union iucv_param));
445 parm->set_mask.ipmask = 0x08;
446 iucv_call_b2f0(IUCV_SETMASK, parm);
447 /* Allow iucv-severed interrupt only */
448 memset(parm, 0, sizeof(union iucv_param));
449 parm->set_mask.ipmask = 0x20;
450 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
451
452 /* Clear indication that iucv interrupts are allowed for this cpu. */
453 cpu_clear(cpu, iucv_irq_cpumask);
454}
455
456/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800457 * iucv_declare_cpu
458 * @data: unused
459 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200460 * Declare a interrupt buffer on this cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800461 */
462static void iucv_declare_cpu(void *data)
463{
464 int cpu = smp_processor_id();
465 union iucv_param *parm;
466 int rc;
467
468 if (cpu_isset(cpu, iucv_buffer_cpumask))
469 return;
470
471 /* Declare interrupt buffer. */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000472 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800473 memset(parm, 0, sizeof(union iucv_param));
Christoph Lameter70cf50352007-11-20 11:13:38 +0100474 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800475 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
476 if (rc) {
477 char *err = "Unknown";
Heiko Carstensda99f052007-05-04 12:23:27 -0700478 switch (rc) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800479 case 0x03:
480 err = "Directory error";
481 break;
482 case 0x0a:
483 err = "Invalid length";
484 break;
485 case 0x13:
486 err = "Buffer already exists";
487 break;
488 case 0x3e:
489 err = "Buffer overlap";
490 break;
491 case 0x5c:
492 err = "Paging or storage error";
493 break;
494 }
Ursula Braun8f7c5022008-12-25 13:39:47 +0100495 pr_warning("Defining an interrupt buffer on CPU %i"
496 " failed with 0x%02x (%s)\n", cpu, rc, err);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800497 return;
498 }
499
500 /* Set indication that an iucv buffer exists for this cpu. */
501 cpu_set(cpu, iucv_buffer_cpumask);
502
503 if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
504 /* Enable iucv interrupts on this cpu. */
505 iucv_allow_cpu(NULL);
506 else
507 /* Disable iucv interrupts on this cpu. */
508 iucv_block_cpu(NULL);
509}
510
511/**
512 * iucv_retrieve_cpu
513 * @data: unused
514 *
515 * Retrieve interrupt buffer on this cpu.
516 */
517static void iucv_retrieve_cpu(void *data)
518{
519 int cpu = smp_processor_id();
520 union iucv_param *parm;
521
522 if (!cpu_isset(cpu, iucv_buffer_cpumask))
523 return;
524
525 /* Block iucv interrupts. */
526 iucv_block_cpu(NULL);
527
528 /* Retrieve interrupt buffer. */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000529 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800530 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
531
532 /* Clear indication that an iucv buffer exists for this cpu. */
533 cpu_clear(cpu, iucv_buffer_cpumask);
534}
535
536/**
537 * iucv_setmask_smp
538 *
539 * Allow iucv interrupts on all cpus.
540 */
541static void iucv_setmask_mp(void)
542{
543 int cpu;
544
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700545 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800546 for_each_online_cpu(cpu)
547 /* Enable all cpus with a declared buffer. */
548 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
549 !cpu_isset(cpu, iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200550 smp_call_function_single(cpu, iucv_allow_cpu,
Jens Axboe8691e5a2008-06-06 11:18:06 +0200551 NULL, 1);
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700552 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800553}
554
555/**
556 * iucv_setmask_up
557 *
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700558 * Allow iucv interrupts on a single cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800559 */
560static void iucv_setmask_up(void)
561{
562 cpumask_t cpumask;
563 int cpu;
564
565 /* Disable all cpu but the first in cpu_irq_cpumask. */
566 cpumask = iucv_irq_cpumask;
567 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
Mike Travis0e12f842008-05-12 21:21:13 +0200568 for_each_cpu_mask_nr(cpu, cpumask)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200569 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800570}
571
572/**
573 * iucv_enable
574 *
575 * This function makes iucv ready for use. It allocates the pathid
576 * table, declares an iucv interrupt buffer and enables the iucv
577 * interrupts. Called when the first user has registered an iucv
578 * handler.
579 */
580static int iucv_enable(void)
581{
582 size_t alloc_size;
583 int cpu, rc;
584
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800585 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800586 rc = -ENOMEM;
587 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
588 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
589 if (!iucv_path_table)
590 goto out;
591 /* Declare per cpu buffers. */
592 rc = -EIO;
593 for_each_online_cpu(cpu)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200594 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800595 if (cpus_empty(iucv_buffer_cpumask))
596 /* No cpu could declare an iucv buffer. */
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800597 goto out;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700598 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800599 return 0;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800600out:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800601 kfree(iucv_path_table);
602 iucv_path_table = NULL;
603 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800604 return rc;
605}
606
607/**
608 * iucv_disable
609 *
610 * This function shuts down iucv. It disables iucv interrupts, retrieves
611 * the iucv interrupt buffer and frees the pathid table. Called after the
612 * last user unregister its iucv handler.
613 */
614static void iucv_disable(void)
615{
Heiko Carstens8b122ef2008-09-30 03:03:35 -0700616 get_online_cpus();
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200617 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800618 kfree(iucv_path_table);
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800619 iucv_path_table = NULL;
620 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800621}
622
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800623static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
624 unsigned long action, void *hcpu)
625{
626 cpumask_t cpumask;
627 long cpu = (long) hcpu;
628
629 switch (action) {
630 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700631 case CPU_UP_PREPARE_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100632 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
633 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
634 if (!iucv_irq_data[cpu])
Akinobu Mita92e99a92010-05-26 14:43:33 -0700635 return notifier_from_errno(-ENOMEM);
636
Christoph Lameter70cf50352007-11-20 11:13:38 +0100637 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
638 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
Akinobu Mitad0236f82008-07-15 02:09:53 -0700639 if (!iucv_param[cpu]) {
640 kfree(iucv_irq_data[cpu]);
641 iucv_irq_data[cpu] = NULL;
Akinobu Mita92e99a92010-05-26 14:43:33 -0700642 return notifier_from_errno(-ENOMEM);
Akinobu Mitad0236f82008-07-15 02:09:53 -0700643 }
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000644 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
645 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
646 if (!iucv_param_irq[cpu]) {
647 kfree(iucv_param[cpu]);
648 iucv_param[cpu] = NULL;
649 kfree(iucv_irq_data[cpu]);
650 iucv_irq_data[cpu] = NULL;
Akinobu Mita92e99a92010-05-26 14:43:33 -0700651 return notifier_from_errno(-ENOMEM);
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000652 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800653 break;
654 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700655 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800656 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700657 case CPU_DEAD_FROZEN:
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000658 kfree(iucv_param_irq[cpu]);
659 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +0100660 kfree(iucv_param[cpu]);
661 iucv_param[cpu] = NULL;
662 kfree(iucv_irq_data[cpu]);
663 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800664 break;
665 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700666 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800667 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700668 case CPU_DOWN_FAILED_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800669 if (!iucv_path_table)
670 break;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200671 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800672 break;
673 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700674 case CPU_DOWN_PREPARE_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800675 if (!iucv_path_table)
676 break;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800677 cpumask = iucv_buffer_cpumask;
678 cpu_clear(cpu, cpumask);
679 if (cpus_empty(cpumask))
680 /* Can't offline last IUCV enabled cpu. */
Akinobu Mita92e99a92010-05-26 14:43:33 -0700681 return notifier_from_errno(-EINVAL);
Jens Axboe8691e5a2008-06-06 11:18:06 +0200682 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800683 if (cpus_empty(iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200684 smp_call_function_single(first_cpu(iucv_buffer_cpumask),
Jens Axboe8691e5a2008-06-06 11:18:06 +0200685 iucv_allow_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800686 break;
687 }
688 return NOTIFY_OK;
689}
690
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700691static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800692 .notifier_call = iucv_cpu_notify,
693};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800694
695/**
696 * iucv_sever_pathid
697 * @pathid: path identification number.
698 * @userdata: 16-bytes of user data.
699 *
700 * Sever an iucv path to free up the pathid. Used internally.
701 */
702static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
703{
704 union iucv_param *parm;
705
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000706 parm = iucv_param_irq[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800707 memset(parm, 0, sizeof(union iucv_param));
708 if (userdata)
709 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
710 parm->ctrl.ippathid = pathid;
711 return iucv_call_b2f0(IUCV_SEVER, parm);
712}
713
714/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700715 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800716 * @dummy: unused dummy argument
717 *
718 * Nop function called via smp_call_function to force work items from
719 * pending external iucv interrupts to the work queue.
720 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700721static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800722{
723}
724
725/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700726 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800727 *
728 * Function called after a path has been severed to find all remaining
729 * work items for the now stale pathid. The caller needs to hold the
730 * iucv_table_lock.
731 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700732static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800733{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700734 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800735
736 /*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700737 * When a path is severed, the pathid can be reused immediatly
738 * on a iucv connect or a connection pending interrupt. Remove
739 * all entries from the task queue that refer to a stale pathid
740 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
741 * or deliver the connection pending interrupt. To get all the
742 * pending interrupts force them to the work queue by calling
743 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800744 */
Jens Axboe8691e5a2008-06-06 11:18:06 +0200745 smp_call_function(__iucv_cleanup_queue, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700746 spin_lock_irq(&iucv_queue_lock);
747 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
748 /* Remove stale work items from the task queue. */
749 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800750 list_del(&p->list);
751 kfree(p);
752 }
753 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700754 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800755}
756
757/**
758 * iucv_register:
759 * @handler: address of iucv handler structure
760 * @smp: != 0 indicates that the handler can deal with out of order messages
761 *
762 * Registers a driver with IUCV.
763 *
764 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
765 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
766 */
767int iucv_register(struct iucv_handler *handler, int smp)
768{
769 int rc;
770
771 if (!iucv_available)
772 return -ENOSYS;
773 mutex_lock(&iucv_register_mutex);
774 if (!smp)
775 iucv_nonsmp_handler++;
776 if (list_empty(&iucv_handler_list)) {
777 rc = iucv_enable();
778 if (rc)
779 goto out_mutex;
780 } else if (!smp && iucv_nonsmp_handler == 1)
781 iucv_setmask_up();
782 INIT_LIST_HEAD(&handler->paths);
783
Ursula Braun435bc9d2008-02-07 18:06:52 -0800784 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800785 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800786 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800787 rc = 0;
788out_mutex:
789 mutex_unlock(&iucv_register_mutex);
790 return rc;
791}
Heiko Carstensda99f052007-05-04 12:23:27 -0700792EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800793
794/**
795 * iucv_unregister
796 * @handler: address of iucv handler structure
797 * @smp: != 0 indicates that the handler can deal with out of order messages
798 *
799 * Unregister driver from IUCV.
800 */
801void iucv_unregister(struct iucv_handler *handler, int smp)
802{
803 struct iucv_path *p, *n;
804
805 mutex_lock(&iucv_register_mutex);
806 spin_lock_bh(&iucv_table_lock);
807 /* Remove handler from the iucv_handler_list. */
808 list_del_init(&handler->list);
809 /* Sever all pathids still refering to the handler. */
810 list_for_each_entry_safe(p, n, &handler->paths, list) {
811 iucv_sever_pathid(p->pathid, NULL);
812 iucv_path_table[p->pathid] = NULL;
813 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800814 iucv_path_free(p);
815 }
816 spin_unlock_bh(&iucv_table_lock);
817 if (!smp)
818 iucv_nonsmp_handler--;
819 if (list_empty(&iucv_handler_list))
820 iucv_disable();
821 else if (!smp && iucv_nonsmp_handler == 0)
822 iucv_setmask_mp();
823 mutex_unlock(&iucv_register_mutex);
824}
Heiko Carstensda99f052007-05-04 12:23:27 -0700825EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800826
Ursula Braun6c005962009-06-16 10:30:41 +0200827static int iucv_reboot_event(struct notifier_block *this,
828 unsigned long event, void *ptr)
829{
830 int i, rc;
831
832 get_online_cpus();
833 on_each_cpu(iucv_block_cpu, NULL, 1);
834 preempt_disable();
835 for (i = 0; i < iucv_max_pathid; i++) {
836 if (iucv_path_table[i])
837 rc = iucv_sever_pathid(i, NULL);
838 }
839 preempt_enable();
840 put_online_cpus();
841 iucv_disable();
842 return NOTIFY_DONE;
843}
844
845static struct notifier_block iucv_reboot_notifier = {
846 .notifier_call = iucv_reboot_event,
847};
848
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800849/**
850 * iucv_path_accept
851 * @path: address of iucv path structure
852 * @handler: address of iucv handler structure
853 * @userdata: 16 bytes of data reflected to the communication partner
854 * @private: private data passed to interrupt handlers for this path
855 *
856 * This function is issued after the user received a connection pending
857 * external interrupt and now wishes to complete the IUCV communication path.
858 *
859 * Returns the result of the CP IUCV call.
860 */
861int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
862 u8 userdata[16], void *private)
863{
864 union iucv_param *parm;
865 int rc;
866
867 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +0000868 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200869 rc = -EIO;
870 goto out;
871 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800872 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100873 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800874 memset(parm, 0, sizeof(union iucv_param));
875 parm->ctrl.ippathid = path->pathid;
876 parm->ctrl.ipmsglim = path->msglim;
877 if (userdata)
878 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
879 parm->ctrl.ipflags1 = path->flags;
880
881 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
882 if (!rc) {
883 path->private = private;
884 path->msglim = parm->ctrl.ipmsglim;
885 path->flags = parm->ctrl.ipflags1;
886 }
Ursula Braun6c005962009-06-16 10:30:41 +0200887out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800888 local_bh_enable();
889 return rc;
890}
Heiko Carstensda99f052007-05-04 12:23:27 -0700891EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800892
893/**
894 * iucv_path_connect
895 * @path: address of iucv path structure
896 * @handler: address of iucv handler structure
897 * @userid: 8-byte user identification
898 * @system: 8-byte target system identification
899 * @userdata: 16 bytes of data reflected to the communication partner
900 * @private: private data passed to interrupt handlers for this path
901 *
902 * This function establishes an IUCV path. Although the connect may complete
903 * successfully, you are not able to use the path until you receive an IUCV
904 * Connection Complete external interrupt.
905 *
906 * Returns the result of the CP IUCV call.
907 */
908int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
909 u8 userid[8], u8 system[8], u8 userdata[16],
910 void *private)
911{
912 union iucv_param *parm;
913 int rc;
914
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700915 spin_lock_bh(&iucv_table_lock);
916 iucv_cleanup_queue();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +0000917 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200918 rc = -EIO;
919 goto out;
920 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100921 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800922 memset(parm, 0, sizeof(union iucv_param));
923 parm->ctrl.ipmsglim = path->msglim;
924 parm->ctrl.ipflags1 = path->flags;
925 if (userid) {
926 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
927 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
928 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
929 }
930 if (system) {
931 memcpy(parm->ctrl.iptarget, system,
932 sizeof(parm->ctrl.iptarget));
933 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
934 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
935 }
936 if (userdata)
937 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
938
939 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
940 if (!rc) {
941 if (parm->ctrl.ippathid < iucv_max_pathid) {
942 path->pathid = parm->ctrl.ippathid;
943 path->msglim = parm->ctrl.ipmsglim;
944 path->flags = parm->ctrl.ipflags1;
945 path->handler = handler;
946 path->private = private;
947 list_add_tail(&path->list, &handler->paths);
948 iucv_path_table[path->pathid] = path;
949 } else {
950 iucv_sever_pathid(parm->ctrl.ippathid,
951 iucv_error_pathid);
952 rc = -EIO;
953 }
954 }
Ursula Braun6c005962009-06-16 10:30:41 +0200955out:
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700956 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800957 return rc;
958}
Heiko Carstensda99f052007-05-04 12:23:27 -0700959EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800960
961/**
962 * iucv_path_quiesce:
963 * @path: address of iucv path structure
964 * @userdata: 16 bytes of data reflected to the communication partner
965 *
966 * This function temporarily suspends incoming messages on an IUCV path.
967 * You can later reactivate the path by invoking the iucv_resume function.
968 *
969 * Returns the result from the CP IUCV call.
970 */
971int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
972{
973 union iucv_param *parm;
974 int rc;
975
976 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +0000977 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200978 rc = -EIO;
979 goto out;
980 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100981 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800982 memset(parm, 0, sizeof(union iucv_param));
983 if (userdata)
984 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
985 parm->ctrl.ippathid = path->pathid;
986 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
Ursula Braun6c005962009-06-16 10:30:41 +0200987out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800988 local_bh_enable();
989 return rc;
990}
Heiko Carstensda99f052007-05-04 12:23:27 -0700991EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800992
993/**
994 * iucv_path_resume:
995 * @path: address of iucv path structure
996 * @userdata: 16 bytes of data reflected to the communication partner
997 *
998 * This function resumes incoming messages on an IUCV path that has
999 * been stopped with iucv_path_quiesce.
1000 *
1001 * Returns the result from the CP IUCV call.
1002 */
1003int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1004{
1005 union iucv_param *parm;
1006 int rc;
1007
1008 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001009 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001010 rc = -EIO;
1011 goto out;
1012 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001013 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001014 memset(parm, 0, sizeof(union iucv_param));
1015 if (userdata)
1016 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1017 parm->ctrl.ippathid = path->pathid;
1018 rc = iucv_call_b2f0(IUCV_RESUME, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001019out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001020 local_bh_enable();
1021 return rc;
1022}
1023
1024/**
1025 * iucv_path_sever
1026 * @path: address of iucv path structure
1027 * @userdata: 16 bytes of data reflected to the communication partner
1028 *
1029 * This function terminates an IUCV path.
1030 *
1031 * Returns the result from the CP IUCV call.
1032 */
1033int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1034{
1035 int rc;
1036
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001037 preempt_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001038 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001039 rc = -EIO;
1040 goto out;
1041 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001042 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001043 spin_lock_bh(&iucv_table_lock);
1044 rc = iucv_sever_pathid(path->pathid, userdata);
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001045 iucv_path_table[path->pathid] = NULL;
1046 list_del_init(&path->list);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001047 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001048 spin_unlock_bh(&iucv_table_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02001049out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001050 preempt_enable();
1051 return rc;
1052}
Heiko Carstensda99f052007-05-04 12:23:27 -07001053EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001054
1055/**
1056 * iucv_message_purge
1057 * @path: address of iucv path structure
1058 * @msg: address of iucv msg structure
1059 * @srccls: source class of message
1060 *
1061 * Cancels a message you have sent.
1062 *
1063 * Returns the result from the CP IUCV call.
1064 */
1065int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1066 u32 srccls)
1067{
1068 union iucv_param *parm;
1069 int rc;
1070
1071 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001072 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001073 rc = -EIO;
1074 goto out;
1075 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001076 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001077 memset(parm, 0, sizeof(union iucv_param));
1078 parm->purge.ippathid = path->pathid;
1079 parm->purge.ipmsgid = msg->id;
1080 parm->purge.ipsrccls = srccls;
1081 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1082 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1083 if (!rc) {
1084 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1085 msg->tag = parm->purge.ipmsgtag;
1086 }
Ursula Braun6c005962009-06-16 10:30:41 +02001087out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001088 local_bh_enable();
1089 return rc;
1090}
Heiko Carstensda99f052007-05-04 12:23:27 -07001091EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001092
1093/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001094 * iucv_message_receive_iprmdata
1095 * @path: address of iucv path structure
1096 * @msg: address of iucv msg structure
1097 * @flags: how the message is received (IUCV_IPBUFLST)
1098 * @buffer: address of data buffer or address of struct iucv_array
1099 * @size: length of data buffer
1100 * @residual:
1101 *
1102 * Internal function used by iucv_message_receive and __iucv_message_receive
1103 * to receive RMDATA data stored in struct iucv_message.
1104 */
1105static int iucv_message_receive_iprmdata(struct iucv_path *path,
1106 struct iucv_message *msg,
1107 u8 flags, void *buffer,
1108 size_t size, size_t *residual)
1109{
1110 struct iucv_array *array;
1111 u8 *rmmsg;
1112 size_t copy;
1113
1114 /*
1115 * Message is 8 bytes long and has been stored to the
1116 * message descriptor itself.
1117 */
1118 if (residual)
1119 *residual = abs(size - 8);
1120 rmmsg = msg->rmmsg;
1121 if (flags & IUCV_IPBUFLST) {
1122 /* Copy to struct iucv_array. */
1123 size = (size < 8) ? size : 8;
1124 for (array = buffer; size > 0; array++) {
1125 copy = min_t(size_t, size, array->length);
1126 memcpy((u8 *)(addr_t) array->address,
1127 rmmsg, copy);
1128 rmmsg += copy;
1129 size -= copy;
1130 }
1131 } else {
1132 /* Copy to direct buffer. */
1133 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1134 }
1135 return 0;
1136}
1137
1138/**
1139 * __iucv_message_receive
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001140 * @path: address of iucv path structure
1141 * @msg: address of iucv msg structure
1142 * @flags: how the message is received (IUCV_IPBUFLST)
1143 * @buffer: address of data buffer or address of struct iucv_array
1144 * @size: length of data buffer
1145 * @residual:
1146 *
1147 * This function receives messages that are being sent to you over
1148 * established paths. This function will deal with RMDATA messages
1149 * embedded in struct iucv_message as well.
1150 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001151 * Locking: no locking
1152 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001153 * Returns the result from the CP IUCV call.
1154 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001155int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1156 u8 flags, void *buffer, size_t size, size_t *residual)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001157{
1158 union iucv_param *parm;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001159 int rc;
1160
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001161 if (msg->flags & IUCV_IPRMDATA)
1162 return iucv_message_receive_iprmdata(path, msg, flags,
1163 buffer, size, residual);
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001164 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001165 rc = -EIO;
1166 goto out;
1167 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001168 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001169 memset(parm, 0, sizeof(union iucv_param));
1170 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1171 parm->db.ipbfln1f = (u32) size;
1172 parm->db.ipmsgid = msg->id;
1173 parm->db.ippathid = path->pathid;
1174 parm->db.iptrgcls = msg->class;
1175 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1176 IUCV_IPFGMID | IUCV_IPTRGCLS);
1177 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1178 if (!rc || rc == 5) {
1179 msg->flags = parm->db.ipflags1;
1180 if (residual)
1181 *residual = parm->db.ipbfln1f;
1182 }
Ursula Braun6c005962009-06-16 10:30:41 +02001183out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001184 return rc;
1185}
1186EXPORT_SYMBOL(__iucv_message_receive);
1187
1188/**
1189 * iucv_message_receive
1190 * @path: address of iucv path structure
1191 * @msg: address of iucv msg structure
1192 * @flags: how the message is received (IUCV_IPBUFLST)
1193 * @buffer: address of data buffer or address of struct iucv_array
1194 * @size: length of data buffer
1195 * @residual:
1196 *
1197 * This function receives messages that are being sent to you over
1198 * established paths. This function will deal with RMDATA messages
1199 * embedded in struct iucv_message as well.
1200 *
1201 * Locking: local_bh_enable/local_bh_disable
1202 *
1203 * Returns the result from the CP IUCV call.
1204 */
1205int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1206 u8 flags, void *buffer, size_t size, size_t *residual)
1207{
1208 int rc;
1209
1210 if (msg->flags & IUCV_IPRMDATA)
1211 return iucv_message_receive_iprmdata(path, msg, flags,
1212 buffer, size, residual);
1213 local_bh_disable();
1214 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001215 local_bh_enable();
1216 return rc;
1217}
Heiko Carstensda99f052007-05-04 12:23:27 -07001218EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001219
1220/**
1221 * iucv_message_reject
1222 * @path: address of iucv path structure
1223 * @msg: address of iucv msg structure
1224 *
1225 * The reject function refuses a specified message. Between the time you
1226 * are notified of a message and the time that you complete the message,
1227 * the message may be rejected.
1228 *
1229 * Returns the result from the CP IUCV call.
1230 */
1231int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1232{
1233 union iucv_param *parm;
1234 int rc;
1235
1236 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001237 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001238 rc = -EIO;
1239 goto out;
1240 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001241 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001242 memset(parm, 0, sizeof(union iucv_param));
1243 parm->db.ippathid = path->pathid;
1244 parm->db.ipmsgid = msg->id;
1245 parm->db.iptrgcls = msg->class;
1246 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1247 rc = iucv_call_b2f0(IUCV_REJECT, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001248out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001249 local_bh_enable();
1250 return rc;
1251}
Heiko Carstensda99f052007-05-04 12:23:27 -07001252EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001253
1254/**
1255 * iucv_message_reply
1256 * @path: address of iucv path structure
1257 * @msg: address of iucv msg structure
1258 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1259 * @reply: address of reply data buffer or address of struct iucv_array
1260 * @size: length of reply data buffer
1261 *
1262 * This function responds to the two-way messages that you receive. You
1263 * must identify completely the message to which you wish to reply. ie,
1264 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1265 * the parameter list.
1266 *
1267 * Returns the result from the CP IUCV call.
1268 */
1269int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1270 u8 flags, void *reply, size_t size)
1271{
1272 union iucv_param *parm;
1273 int rc;
1274
1275 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001276 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001277 rc = -EIO;
1278 goto out;
1279 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001280 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001281 memset(parm, 0, sizeof(union iucv_param));
1282 if (flags & IUCV_IPRMDATA) {
1283 parm->dpl.ippathid = path->pathid;
1284 parm->dpl.ipflags1 = flags;
1285 parm->dpl.ipmsgid = msg->id;
1286 parm->dpl.iptrgcls = msg->class;
1287 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1288 } else {
1289 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1290 parm->db.ipbfln1f = (u32) size;
1291 parm->db.ippathid = path->pathid;
1292 parm->db.ipflags1 = flags;
1293 parm->db.ipmsgid = msg->id;
1294 parm->db.iptrgcls = msg->class;
1295 }
1296 rc = iucv_call_b2f0(IUCV_REPLY, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001297out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001298 local_bh_enable();
1299 return rc;
1300}
Heiko Carstensda99f052007-05-04 12:23:27 -07001301EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001302
1303/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001304 * __iucv_message_send
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001305 * @path: address of iucv path structure
1306 * @msg: address of iucv msg structure
1307 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1308 * @srccls: source class of message
1309 * @buffer: address of send buffer or address of struct iucv_array
1310 * @size: length of send buffer
1311 *
1312 * This function transmits data to another application. Data to be
1313 * transmitted is in a buffer and this is a one-way message and the
1314 * receiver will not reply to the message.
1315 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001316 * Locking: no locking
1317 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001318 * Returns the result from the CP IUCV call.
1319 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001320int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001321 u8 flags, u32 srccls, void *buffer, size_t size)
1322{
1323 union iucv_param *parm;
1324 int rc;
1325
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001326 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001327 rc = -EIO;
1328 goto out;
1329 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001330 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001331 memset(parm, 0, sizeof(union iucv_param));
1332 if (flags & IUCV_IPRMDATA) {
1333 /* Message of 8 bytes can be placed into the parameter list. */
1334 parm->dpl.ippathid = path->pathid;
1335 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1336 parm->dpl.iptrgcls = msg->class;
1337 parm->dpl.ipsrccls = srccls;
1338 parm->dpl.ipmsgtag = msg->tag;
1339 memcpy(parm->dpl.iprmmsg, buffer, 8);
1340 } else {
1341 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1342 parm->db.ipbfln1f = (u32) size;
1343 parm->db.ippathid = path->pathid;
1344 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1345 parm->db.iptrgcls = msg->class;
1346 parm->db.ipsrccls = srccls;
1347 parm->db.ipmsgtag = msg->tag;
1348 }
1349 rc = iucv_call_b2f0(IUCV_SEND, parm);
1350 if (!rc)
1351 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001352out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001353 return rc;
1354}
1355EXPORT_SYMBOL(__iucv_message_send);
1356
1357/**
1358 * iucv_message_send
1359 * @path: address of iucv path structure
1360 * @msg: address of iucv msg structure
1361 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1362 * @srccls: source class of message
1363 * @buffer: address of send buffer or address of struct iucv_array
1364 * @size: length of send buffer
1365 *
1366 * This function transmits data to another application. Data to be
1367 * transmitted is in a buffer and this is a one-way message and the
1368 * receiver will not reply to the message.
1369 *
1370 * Locking: local_bh_enable/local_bh_disable
1371 *
1372 * Returns the result from the CP IUCV call.
1373 */
1374int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1375 u8 flags, u32 srccls, void *buffer, size_t size)
1376{
1377 int rc;
1378
1379 local_bh_disable();
1380 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001381 local_bh_enable();
1382 return rc;
1383}
Heiko Carstensda99f052007-05-04 12:23:27 -07001384EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001385
1386/**
1387 * iucv_message_send2way
1388 * @path: address of iucv path structure
1389 * @msg: address of iucv msg structure
1390 * @flags: how the message is sent and the reply is received
1391 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1392 * @srccls: source class of message
1393 * @buffer: address of send buffer or address of struct iucv_array
1394 * @size: length of send buffer
1395 * @ansbuf: address of answer buffer or address of struct iucv_array
1396 * @asize: size of reply buffer
1397 *
1398 * This function transmits data to another application. Data to be
1399 * transmitted is in a buffer. The receiver of the send is expected to
1400 * reply to the message and a buffer is provided into which IUCV moves
1401 * the reply to this message.
1402 *
1403 * Returns the result from the CP IUCV call.
1404 */
1405int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1406 u8 flags, u32 srccls, void *buffer, size_t size,
1407 void *answer, size_t asize, size_t *residual)
1408{
1409 union iucv_param *parm;
1410 int rc;
1411
1412 local_bh_disable();
Hendrik Bruecknerd28ecab2009-09-16 04:37:23 +00001413 if (cpus_empty(iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001414 rc = -EIO;
1415 goto out;
1416 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001417 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001418 memset(parm, 0, sizeof(union iucv_param));
1419 if (flags & IUCV_IPRMDATA) {
1420 parm->dpl.ippathid = path->pathid;
1421 parm->dpl.ipflags1 = path->flags; /* priority message */
1422 parm->dpl.iptrgcls = msg->class;
1423 parm->dpl.ipsrccls = srccls;
1424 parm->dpl.ipmsgtag = msg->tag;
1425 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1426 parm->dpl.ipbfln2f = (u32) asize;
1427 memcpy(parm->dpl.iprmmsg, buffer, 8);
1428 } else {
1429 parm->db.ippathid = path->pathid;
1430 parm->db.ipflags1 = path->flags; /* priority message */
1431 parm->db.iptrgcls = msg->class;
1432 parm->db.ipsrccls = srccls;
1433 parm->db.ipmsgtag = msg->tag;
1434 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1435 parm->db.ipbfln1f = (u32) size;
1436 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1437 parm->db.ipbfln2f = (u32) asize;
1438 }
1439 rc = iucv_call_b2f0(IUCV_SEND, parm);
1440 if (!rc)
1441 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001442out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001443 local_bh_enable();
1444 return rc;
1445}
Heiko Carstensda99f052007-05-04 12:23:27 -07001446EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001447
1448/**
1449 * iucv_path_pending
1450 * @data: Pointer to external interrupt buffer
1451 *
1452 * Process connection pending work item. Called from tasklet while holding
1453 * iucv_table_lock.
1454 */
1455struct iucv_path_pending {
1456 u16 ippathid;
1457 u8 ipflags1;
1458 u8 iptype;
1459 u16 ipmsglim;
1460 u16 res1;
1461 u8 ipvmid[8];
1462 u8 ipuser[16];
1463 u32 res3;
1464 u8 ippollfg;
1465 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001466} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001467
1468static void iucv_path_pending(struct iucv_irq_data *data)
1469{
1470 struct iucv_path_pending *ipp = (void *) data;
1471 struct iucv_handler *handler;
1472 struct iucv_path *path;
1473 char *error;
1474
1475 BUG_ON(iucv_path_table[ipp->ippathid]);
1476 /* New pathid, handler found. Create a new path struct. */
1477 error = iucv_error_no_memory;
1478 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1479 if (!path)
1480 goto out_sever;
1481 path->pathid = ipp->ippathid;
1482 iucv_path_table[path->pathid] = path;
1483 EBCASC(ipp->ipvmid, 8);
1484
1485 /* Call registered handler until one is found that wants the path. */
1486 list_for_each_entry(handler, &iucv_handler_list, list) {
1487 if (!handler->path_pending)
1488 continue;
1489 /*
1490 * Add path to handler to allow a call to iucv_path_sever
1491 * inside the path_pending function. If the handler returns
1492 * an error remove the path from the handler again.
1493 */
1494 list_add(&path->list, &handler->paths);
1495 path->handler = handler;
1496 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1497 return;
1498 list_del(&path->list);
1499 path->handler = NULL;
1500 }
1501 /* No handler wanted the path. */
1502 iucv_path_table[path->pathid] = NULL;
1503 iucv_path_free(path);
1504 error = iucv_error_no_listener;
1505out_sever:
1506 iucv_sever_pathid(ipp->ippathid, error);
1507}
1508
1509/**
1510 * iucv_path_complete
1511 * @data: Pointer to external interrupt buffer
1512 *
1513 * Process connection complete work item. Called from tasklet while holding
1514 * iucv_table_lock.
1515 */
1516struct iucv_path_complete {
1517 u16 ippathid;
1518 u8 ipflags1;
1519 u8 iptype;
1520 u16 ipmsglim;
1521 u16 res1;
1522 u8 res2[8];
1523 u8 ipuser[16];
1524 u32 res3;
1525 u8 ippollfg;
1526 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001527} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001528
1529static void iucv_path_complete(struct iucv_irq_data *data)
1530{
1531 struct iucv_path_complete *ipc = (void *) data;
1532 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1533
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001534 if (path)
1535 path->flags = ipc->ipflags1;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001536 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001537 path->handler->path_complete(path, ipc->ipuser);
1538}
1539
1540/**
1541 * iucv_path_severed
1542 * @data: Pointer to external interrupt buffer
1543 *
1544 * Process connection severed work item. Called from tasklet while holding
1545 * iucv_table_lock.
1546 */
1547struct iucv_path_severed {
1548 u16 ippathid;
1549 u8 res1;
1550 u8 iptype;
1551 u32 res2;
1552 u8 res3[8];
1553 u8 ipuser[16];
1554 u32 res4;
1555 u8 ippollfg;
1556 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001557} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001558
1559static void iucv_path_severed(struct iucv_irq_data *data)
1560{
1561 struct iucv_path_severed *ips = (void *) data;
1562 struct iucv_path *path = iucv_path_table[ips->ippathid];
1563
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001564 if (!path || !path->handler) /* Already severed */
1565 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001566 if (path->handler->path_severed)
1567 path->handler->path_severed(path, ips->ipuser);
1568 else {
1569 iucv_sever_pathid(path->pathid, NULL);
1570 iucv_path_table[path->pathid] = NULL;
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001571 list_del(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001572 iucv_path_free(path);
1573 }
1574}
1575
1576/**
1577 * iucv_path_quiesced
1578 * @data: Pointer to external interrupt buffer
1579 *
1580 * Process connection quiesced work item. Called from tasklet while holding
1581 * iucv_table_lock.
1582 */
1583struct iucv_path_quiesced {
1584 u16 ippathid;
1585 u8 res1;
1586 u8 iptype;
1587 u32 res2;
1588 u8 res3[8];
1589 u8 ipuser[16];
1590 u32 res4;
1591 u8 ippollfg;
1592 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001593} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001594
1595static void iucv_path_quiesced(struct iucv_irq_data *data)
1596{
1597 struct iucv_path_quiesced *ipq = (void *) data;
1598 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1599
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001600 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001601 path->handler->path_quiesced(path, ipq->ipuser);
1602}
1603
1604/**
1605 * iucv_path_resumed
1606 * @data: Pointer to external interrupt buffer
1607 *
1608 * Process connection resumed work item. Called from tasklet while holding
1609 * iucv_table_lock.
1610 */
1611struct iucv_path_resumed {
1612 u16 ippathid;
1613 u8 res1;
1614 u8 iptype;
1615 u32 res2;
1616 u8 res3[8];
1617 u8 ipuser[16];
1618 u32 res4;
1619 u8 ippollfg;
1620 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001621} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001622
1623static void iucv_path_resumed(struct iucv_irq_data *data)
1624{
1625 struct iucv_path_resumed *ipr = (void *) data;
1626 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1627
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001628 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001629 path->handler->path_resumed(path, ipr->ipuser);
1630}
1631
1632/**
1633 * iucv_message_complete
1634 * @data: Pointer to external interrupt buffer
1635 *
1636 * Process message complete work item. Called from tasklet while holding
1637 * iucv_table_lock.
1638 */
1639struct iucv_message_complete {
1640 u16 ippathid;
1641 u8 ipflags1;
1642 u8 iptype;
1643 u32 ipmsgid;
1644 u32 ipaudit;
1645 u8 iprmmsg[8];
1646 u32 ipsrccls;
1647 u32 ipmsgtag;
1648 u32 res;
1649 u32 ipbfln2f;
1650 u8 ippollfg;
1651 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001652} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001653
1654static void iucv_message_complete(struct iucv_irq_data *data)
1655{
1656 struct iucv_message_complete *imc = (void *) data;
1657 struct iucv_path *path = iucv_path_table[imc->ippathid];
1658 struct iucv_message msg;
1659
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001660 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001661 msg.flags = imc->ipflags1;
1662 msg.id = imc->ipmsgid;
1663 msg.audit = imc->ipaudit;
1664 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1665 msg.class = imc->ipsrccls;
1666 msg.tag = imc->ipmsgtag;
1667 msg.length = imc->ipbfln2f;
1668 path->handler->message_complete(path, &msg);
1669 }
1670}
1671
1672/**
1673 * iucv_message_pending
1674 * @data: Pointer to external interrupt buffer
1675 *
1676 * Process message pending work item. Called from tasklet while holding
1677 * iucv_table_lock.
1678 */
1679struct iucv_message_pending {
1680 u16 ippathid;
1681 u8 ipflags1;
1682 u8 iptype;
1683 u32 ipmsgid;
1684 u32 iptrgcls;
1685 union {
1686 u32 iprmmsg1_u32;
1687 u8 iprmmsg1[4];
1688 } ln1msg1;
1689 union {
1690 u32 ipbfln1f;
1691 u8 iprmmsg2[4];
1692 } ln1msg2;
1693 u32 res1[3];
1694 u32 ipbfln2f;
1695 u8 ippollfg;
1696 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001697} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001698
1699static void iucv_message_pending(struct iucv_irq_data *data)
1700{
1701 struct iucv_message_pending *imp = (void *) data;
1702 struct iucv_path *path = iucv_path_table[imp->ippathid];
1703 struct iucv_message msg;
1704
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001705 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001706 msg.flags = imp->ipflags1;
1707 msg.id = imp->ipmsgid;
1708 msg.class = imp->iptrgcls;
1709 if (imp->ipflags1 & IUCV_IPRMDATA) {
1710 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1711 msg.length = 8;
1712 } else
1713 msg.length = imp->ln1msg2.ipbfln1f;
1714 msg.reply_size = imp->ipbfln2f;
1715 path->handler->message_pending(path, &msg);
1716 }
1717}
1718
1719/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001720 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001721 *
1722 * This tasklet loops over the queue of irq buffers created by
1723 * iucv_external_interrupt, calls the appropriate action handler
1724 * and then frees the buffer.
1725 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001726static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001727{
1728 typedef void iucv_irq_fn(struct iucv_irq_data *);
1729 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001730 [0x02] = iucv_path_complete,
1731 [0x03] = iucv_path_severed,
1732 [0x04] = iucv_path_quiesced,
1733 [0x05] = iucv_path_resumed,
1734 [0x06] = iucv_message_complete,
1735 [0x07] = iucv_message_complete,
1736 [0x08] = iucv_message_pending,
1737 [0x09] = iucv_message_pending,
1738 };
Denis Chengb5e78332007-12-07 00:51:45 -08001739 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001740 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001741
1742 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001743 if (!spin_trylock(&iucv_table_lock)) {
1744 tasklet_schedule(&iucv_tasklet);
1745 return;
1746 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001747 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001748
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001749 spin_lock_irq(&iucv_queue_lock);
1750 list_splice_init(&iucv_task_queue, &task_queue);
1751 spin_unlock_irq(&iucv_queue_lock);
1752
1753 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001754 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001755 irq_fn[p->data.iptype](&p->data);
1756 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001757 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001758
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001759 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001760 spin_unlock(&iucv_table_lock);
1761}
1762
1763/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001764 * iucv_work_fn:
1765 *
1766 * This work function loops over the queue of path pending irq blocks
1767 * created by iucv_external_interrupt, calls the appropriate action
1768 * handler and then frees the buffer.
1769 */
1770static void iucv_work_fn(struct work_struct *work)
1771{
Denis Chengb5e78332007-12-07 00:51:45 -08001772 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001773 struct iucv_irq_list *p, *n;
1774
1775 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1776 spin_lock_bh(&iucv_table_lock);
1777 iucv_active_cpu = smp_processor_id();
1778
1779 spin_lock_irq(&iucv_queue_lock);
1780 list_splice_init(&iucv_work_queue, &work_queue);
1781 spin_unlock_irq(&iucv_queue_lock);
1782
1783 iucv_cleanup_queue();
1784 list_for_each_entry_safe(p, n, &work_queue, list) {
1785 list_del_init(&p->list);
1786 iucv_path_pending(&p->data);
1787 kfree(p);
1788 }
1789
1790 iucv_active_cpu = -1;
1791 spin_unlock_bh(&iucv_table_lock);
1792}
1793
1794/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001795 * iucv_external_interrupt
1796 * @code: irq code
1797 *
1798 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001799 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001800 */
Martin Schwidefskyf6649a72010-10-25 16:10:38 +02001801static void iucv_external_interrupt(unsigned int ext_int_code,
1802 unsigned int param32, unsigned long param64)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001803{
1804 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001805 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001806
Christoph Lameter70cf50352007-11-20 11:13:38 +01001807 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001808 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001809 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001810 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1811 return;
1812 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001813 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001814 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001815 if (!work) {
Ursula Braun8f7c5022008-12-25 13:39:47 +01001816 pr_warning("iucv_external_interrupt: out of memory\n");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001817 return;
1818 }
1819 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001820 spin_lock(&iucv_queue_lock);
1821 if (p->iptype == 0x01) {
1822 /* Path pending interrupt. */
1823 list_add_tail(&work->list, &iucv_work_queue);
1824 schedule_work(&iucv_work);
1825 } else {
1826 /* The other interrupts. */
1827 list_add_tail(&work->list, &iucv_task_queue);
1828 tasklet_schedule(&iucv_tasklet);
1829 }
1830 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001831}
1832
Ursula Braun672e4052009-06-16 10:30:42 +02001833static int iucv_pm_prepare(struct device *dev)
1834{
1835 int rc = 0;
1836
1837#ifdef CONFIG_PM_DEBUG
1838 printk(KERN_INFO "iucv_pm_prepare\n");
1839#endif
1840 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1841 rc = dev->driver->pm->prepare(dev);
1842 return rc;
1843}
1844
1845static void iucv_pm_complete(struct device *dev)
1846{
1847#ifdef CONFIG_PM_DEBUG
1848 printk(KERN_INFO "iucv_pm_complete\n");
1849#endif
1850 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1851 dev->driver->pm->complete(dev);
1852}
1853
1854/**
1855 * iucv_path_table_empty() - determine if iucv path table is empty
1856 *
1857 * Returns 0 if there are still iucv pathes defined
1858 * 1 if there are no iucv pathes defined
1859 */
1860int iucv_path_table_empty(void)
1861{
1862 int i;
1863
1864 for (i = 0; i < iucv_max_pathid; i++) {
1865 if (iucv_path_table[i])
1866 return 0;
1867 }
1868 return 1;
1869}
1870
1871/**
1872 * iucv_pm_freeze() - Freeze PM callback
1873 * @dev: iucv-based device
1874 *
1875 * disable iucv interrupts
1876 * invoke callback function of the iucv-based driver
1877 * shut down iucv, if no iucv-pathes are established anymore
1878 */
1879static int iucv_pm_freeze(struct device *dev)
1880{
1881 int cpu;
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001882 struct iucv_irq_list *p, *n;
Ursula Braun672e4052009-06-16 10:30:42 +02001883 int rc = 0;
1884
1885#ifdef CONFIG_PM_DEBUG
1886 printk(KERN_WARNING "iucv_pm_freeze\n");
1887#endif
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001888 if (iucv_pm_state != IUCV_PM_FREEZING) {
1889 for_each_cpu_mask_nr(cpu, iucv_irq_cpumask)
1890 smp_call_function_single(cpu, iucv_block_cpu_almost,
1891 NULL, 1);
1892 cancel_work_sync(&iucv_work);
1893 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1894 list_del_init(&p->list);
1895 iucv_sever_pathid(p->data.ippathid,
1896 iucv_error_no_listener);
1897 kfree(p);
1898 }
1899 }
Ursula Braun4c89d862009-09-16 04:37:22 +00001900 iucv_pm_state = IUCV_PM_FREEZING;
Ursula Braun672e4052009-06-16 10:30:42 +02001901 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1902 rc = dev->driver->pm->freeze(dev);
1903 if (iucv_path_table_empty())
1904 iucv_disable();
1905 return rc;
1906}
1907
1908/**
1909 * iucv_pm_thaw() - Thaw PM callback
1910 * @dev: iucv-based device
1911 *
1912 * make iucv ready for use again: allocate path table, declare interrupt buffers
1913 * and enable iucv interrupts
1914 * invoke callback function of the iucv-based driver
1915 */
1916static int iucv_pm_thaw(struct device *dev)
1917{
1918 int rc = 0;
1919
1920#ifdef CONFIG_PM_DEBUG
1921 printk(KERN_WARNING "iucv_pm_thaw\n");
1922#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001923 iucv_pm_state = IUCV_PM_THAWING;
Ursula Braun672e4052009-06-16 10:30:42 +02001924 if (!iucv_path_table) {
1925 rc = iucv_enable();
1926 if (rc)
1927 goto out;
1928 }
1929 if (cpus_empty(iucv_irq_cpumask)) {
1930 if (iucv_nonsmp_handler)
1931 /* enable interrupts on one cpu */
1932 iucv_allow_cpu(NULL);
1933 else
1934 /* enable interrupts on all cpus */
1935 iucv_setmask_mp();
1936 }
1937 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1938 rc = dev->driver->pm->thaw(dev);
1939out:
1940 return rc;
1941}
1942
1943/**
1944 * iucv_pm_restore() - Restore PM callback
1945 * @dev: iucv-based device
1946 *
1947 * make iucv ready for use again: allocate path table, declare interrupt buffers
1948 * and enable iucv interrupts
1949 * invoke callback function of the iucv-based driver
1950 */
1951static int iucv_pm_restore(struct device *dev)
1952{
1953 int rc = 0;
1954
1955#ifdef CONFIG_PM_DEBUG
1956 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1957#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001958 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1959 pr_warning("Suspending Linux did not completely close all IUCV "
1960 "connections\n");
1961 iucv_pm_state = IUCV_PM_RESTORING;
Ursula Braun672e4052009-06-16 10:30:42 +02001962 if (cpus_empty(iucv_irq_cpumask)) {
1963 rc = iucv_query_maxconn();
1964 rc = iucv_enable();
1965 if (rc)
1966 goto out;
1967 }
1968 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1969 rc = dev->driver->pm->restore(dev);
1970out:
1971 return rc;
1972}
1973
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001974/**
1975 * iucv_init
1976 *
1977 * Allocates and initializes various data structures.
1978 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001979static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001980{
1981 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001982 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001983
1984 if (!MACHINE_IS_VM) {
1985 rc = -EPROTONOSUPPORT;
1986 goto out;
1987 }
1988 rc = iucv_query_maxconn();
1989 if (rc)
1990 goto out;
Heiko Carstensda99f052007-05-04 12:23:27 -07001991 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001992 if (rc)
1993 goto out;
Mark McLoughlin035da162008-12-15 12:58:29 +00001994 iucv_root = root_device_register("iucv");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001995 if (IS_ERR(iucv_root)) {
1996 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001997 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001998 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001999
2000 for_each_online_cpu(cpu) {
2001 /* Note: GFP_DMA used to get memory below 2G */
2002 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
2003 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2004 if (!iucv_irq_data[cpu]) {
2005 rc = -ENOMEM;
2006 goto out_free;
2007 }
2008
2009 /* Allocate parameter blocks. */
2010 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
2011 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2012 if (!iucv_param[cpu]) {
2013 rc = -ENOMEM;
2014 goto out_free;
2015 }
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002016 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
2017 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2018 if (!iucv_param_irq[cpu]) {
2019 rc = -ENOMEM;
2020 goto out_free;
2021 }
2022
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002023 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002024 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
2025 if (rc)
2026 goto out_free;
Ursula Braun6c005962009-06-16 10:30:41 +02002027 rc = register_reboot_notifier(&iucv_reboot_notifier);
2028 if (rc)
2029 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002030 ASCEBC(iucv_error_no_listener, 16);
2031 ASCEBC(iucv_error_no_memory, 16);
2032 ASCEBC(iucv_error_pathid, 16);
2033 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002034 rc = bus_register(&iucv_bus);
2035 if (rc)
Ursula Braun6c005962009-06-16 10:30:41 +02002036 goto out_reboot;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002037 return 0;
2038
Ursula Braun6c005962009-06-16 10:30:41 +02002039out_reboot:
2040 unregister_reboot_notifier(&iucv_reboot_notifier);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002041out_cpu:
2042 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002043out_free:
2044 for_each_possible_cpu(cpu) {
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002045 kfree(iucv_param_irq[cpu]);
2046 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002047 kfree(iucv_param[cpu]);
2048 iucv_param[cpu] = NULL;
2049 kfree(iucv_irq_data[cpu]);
2050 iucv_irq_data[cpu] = NULL;
2051 }
Mark McLoughlin035da162008-12-15 12:58:29 +00002052 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002053out_int:
2054 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2055out:
2056 return rc;
2057}
2058
2059/**
2060 * iucv_exit
2061 *
2062 * Frees everything allocated from iucv_init.
2063 */
Heiko Carstensda99f052007-05-04 12:23:27 -07002064static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002065{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002066 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002067 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002068
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002069 spin_lock_irq(&iucv_queue_lock);
2070 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2071 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002072 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2073 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002074 spin_unlock_irq(&iucv_queue_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02002075 unregister_reboot_notifier(&iucv_reboot_notifier);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002076 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002077 for_each_possible_cpu(cpu) {
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002078 kfree(iucv_param_irq[cpu]);
2079 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002080 kfree(iucv_param[cpu]);
2081 iucv_param[cpu] = NULL;
2082 kfree(iucv_irq_data[cpu]);
2083 iucv_irq_data[cpu] = NULL;
2084 }
Mark McLoughlin035da162008-12-15 12:58:29 +00002085 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002086 bus_unregister(&iucv_bus);
2087 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2088}
2089
2090subsys_initcall(iucv_init);
2091module_exit(iucv_exit);
2092
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002093MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2094MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2095MODULE_LICENSE("GPL");