blob: 705959b31e24dab7cd85db52b1b098391cfa2489 [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,
Jens Axboe8691e5a2008-06-06 11:18:06 +0200483 NULL, 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);
Mike Travis0e12f842008-05-12 21:21:13 +0200500 for_each_cpu_mask_nr(cpu, cpumask)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200501 smp_call_function_single(cpu, iucv_block_cpu, NULL, 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)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200526 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700527 preempt_enable();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800528 if (cpus_empty(iucv_buffer_cpumask))
529 /* No cpu could declare an iucv buffer. */
530 goto out_path;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700531 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800532 return 0;
533
534out_path:
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700535 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800536 kfree(iucv_path_table);
537out:
538 return rc;
539}
540
541/**
542 * iucv_disable
543 *
544 * This function shuts down iucv. It disables iucv interrupts, retrieves
545 * the iucv interrupt buffer and frees the pathid table. Called after the
546 * last user unregister its iucv handler.
547 */
548static void iucv_disable(void)
549{
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200550 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800551 kfree(iucv_path_table);
552}
553
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800554static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
555 unsigned long action, void *hcpu)
556{
557 cpumask_t cpumask;
558 long cpu = (long) hcpu;
559
560 switch (action) {
561 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700562 case CPU_UP_PREPARE_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100563 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
564 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
565 if (!iucv_irq_data[cpu])
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800566 return NOTIFY_BAD;
Christoph Lameter70cf50352007-11-20 11:13:38 +0100567 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
568 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
Akinobu Mitad0236f82008-07-15 02:09:53 -0700569 if (!iucv_param[cpu]) {
570 kfree(iucv_irq_data[cpu]);
571 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800572 return NOTIFY_BAD;
Akinobu Mitad0236f82008-07-15 02:09:53 -0700573 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800574 break;
575 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700576 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800577 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700578 case CPU_DEAD_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100579 kfree(iucv_param[cpu]);
580 iucv_param[cpu] = NULL;
581 kfree(iucv_irq_data[cpu]);
582 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800583 break;
584 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700585 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800586 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700587 case CPU_DOWN_FAILED_FROZEN:
Jens Axboe8691e5a2008-06-06 11:18:06 +0200588 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800589 break;
590 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700591 case CPU_DOWN_PREPARE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800592 cpumask = iucv_buffer_cpumask;
593 cpu_clear(cpu, cpumask);
594 if (cpus_empty(cpumask))
595 /* Can't offline last IUCV enabled cpu. */
596 return NOTIFY_BAD;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200597 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800598 if (cpus_empty(iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200599 smp_call_function_single(first_cpu(iucv_buffer_cpumask),
Jens Axboe8691e5a2008-06-06 11:18:06 +0200600 iucv_allow_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800601 break;
602 }
603 return NOTIFY_OK;
604}
605
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700606static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800607 .notifier_call = iucv_cpu_notify,
608};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800609
610/**
611 * iucv_sever_pathid
612 * @pathid: path identification number.
613 * @userdata: 16-bytes of user data.
614 *
615 * Sever an iucv path to free up the pathid. Used internally.
616 */
617static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
618{
619 union iucv_param *parm;
620
Christoph Lameter70cf50352007-11-20 11:13:38 +0100621 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800622 memset(parm, 0, sizeof(union iucv_param));
623 if (userdata)
624 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
625 parm->ctrl.ippathid = pathid;
626 return iucv_call_b2f0(IUCV_SEVER, parm);
627}
628
629/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700630 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800631 * @dummy: unused dummy argument
632 *
633 * Nop function called via smp_call_function to force work items from
634 * pending external iucv interrupts to the work queue.
635 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700636static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800637{
638}
639
640/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700641 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800642 *
643 * Function called after a path has been severed to find all remaining
644 * work items for the now stale pathid. The caller needs to hold the
645 * iucv_table_lock.
646 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700647static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800648{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700649 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800650
651 /*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700652 * When a path is severed, the pathid can be reused immediatly
653 * on a iucv connect or a connection pending interrupt. Remove
654 * all entries from the task queue that refer to a stale pathid
655 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
656 * or deliver the connection pending interrupt. To get all the
657 * pending interrupts force them to the work queue by calling
658 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800659 */
Jens Axboe8691e5a2008-06-06 11:18:06 +0200660 smp_call_function(__iucv_cleanup_queue, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700661 spin_lock_irq(&iucv_queue_lock);
662 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
663 /* Remove stale work items from the task queue. */
664 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800665 list_del(&p->list);
666 kfree(p);
667 }
668 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700669 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800670}
671
672/**
673 * iucv_register:
674 * @handler: address of iucv handler structure
675 * @smp: != 0 indicates that the handler can deal with out of order messages
676 *
677 * Registers a driver with IUCV.
678 *
679 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
680 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
681 */
682int iucv_register(struct iucv_handler *handler, int smp)
683{
684 int rc;
685
686 if (!iucv_available)
687 return -ENOSYS;
688 mutex_lock(&iucv_register_mutex);
689 if (!smp)
690 iucv_nonsmp_handler++;
691 if (list_empty(&iucv_handler_list)) {
692 rc = iucv_enable();
693 if (rc)
694 goto out_mutex;
695 } else if (!smp && iucv_nonsmp_handler == 1)
696 iucv_setmask_up();
697 INIT_LIST_HEAD(&handler->paths);
698
Ursula Braun435bc9d2008-02-07 18:06:52 -0800699 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800700 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800701 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800702 rc = 0;
703out_mutex:
704 mutex_unlock(&iucv_register_mutex);
705 return rc;
706}
Heiko Carstensda99f052007-05-04 12:23:27 -0700707EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800708
709/**
710 * iucv_unregister
711 * @handler: address of iucv handler structure
712 * @smp: != 0 indicates that the handler can deal with out of order messages
713 *
714 * Unregister driver from IUCV.
715 */
716void iucv_unregister(struct iucv_handler *handler, int smp)
717{
718 struct iucv_path *p, *n;
719
720 mutex_lock(&iucv_register_mutex);
721 spin_lock_bh(&iucv_table_lock);
722 /* Remove handler from the iucv_handler_list. */
723 list_del_init(&handler->list);
724 /* Sever all pathids still refering to the handler. */
725 list_for_each_entry_safe(p, n, &handler->paths, list) {
726 iucv_sever_pathid(p->pathid, NULL);
727 iucv_path_table[p->pathid] = NULL;
728 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800729 iucv_path_free(p);
730 }
731 spin_unlock_bh(&iucv_table_lock);
732 if (!smp)
733 iucv_nonsmp_handler--;
734 if (list_empty(&iucv_handler_list))
735 iucv_disable();
736 else if (!smp && iucv_nonsmp_handler == 0)
737 iucv_setmask_mp();
738 mutex_unlock(&iucv_register_mutex);
739}
Heiko Carstensda99f052007-05-04 12:23:27 -0700740EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800741
742/**
743 * iucv_path_accept
744 * @path: address of iucv path structure
745 * @handler: address of iucv handler structure
746 * @userdata: 16 bytes of data reflected to the communication partner
747 * @private: private data passed to interrupt handlers for this path
748 *
749 * This function is issued after the user received a connection pending
750 * external interrupt and now wishes to complete the IUCV communication path.
751 *
752 * Returns the result of the CP IUCV call.
753 */
754int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
755 u8 userdata[16], void *private)
756{
757 union iucv_param *parm;
758 int rc;
759
760 local_bh_disable();
761 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100762 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800763 memset(parm, 0, sizeof(union iucv_param));
764 parm->ctrl.ippathid = path->pathid;
765 parm->ctrl.ipmsglim = path->msglim;
766 if (userdata)
767 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
768 parm->ctrl.ipflags1 = path->flags;
769
770 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
771 if (!rc) {
772 path->private = private;
773 path->msglim = parm->ctrl.ipmsglim;
774 path->flags = parm->ctrl.ipflags1;
775 }
776 local_bh_enable();
777 return rc;
778}
Heiko Carstensda99f052007-05-04 12:23:27 -0700779EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800780
781/**
782 * iucv_path_connect
783 * @path: address of iucv path structure
784 * @handler: address of iucv handler structure
785 * @userid: 8-byte user identification
786 * @system: 8-byte target system identification
787 * @userdata: 16 bytes of data reflected to the communication partner
788 * @private: private data passed to interrupt handlers for this path
789 *
790 * This function establishes an IUCV path. Although the connect may complete
791 * successfully, you are not able to use the path until you receive an IUCV
792 * Connection Complete external interrupt.
793 *
794 * Returns the result of the CP IUCV call.
795 */
796int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
797 u8 userid[8], u8 system[8], u8 userdata[16],
798 void *private)
799{
800 union iucv_param *parm;
801 int rc;
802
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700803 spin_lock_bh(&iucv_table_lock);
804 iucv_cleanup_queue();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100805 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800806 memset(parm, 0, sizeof(union iucv_param));
807 parm->ctrl.ipmsglim = path->msglim;
808 parm->ctrl.ipflags1 = path->flags;
809 if (userid) {
810 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
811 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
812 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
813 }
814 if (system) {
815 memcpy(parm->ctrl.iptarget, system,
816 sizeof(parm->ctrl.iptarget));
817 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
818 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
819 }
820 if (userdata)
821 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
822
823 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
824 if (!rc) {
825 if (parm->ctrl.ippathid < iucv_max_pathid) {
826 path->pathid = parm->ctrl.ippathid;
827 path->msglim = parm->ctrl.ipmsglim;
828 path->flags = parm->ctrl.ipflags1;
829 path->handler = handler;
830 path->private = private;
831 list_add_tail(&path->list, &handler->paths);
832 iucv_path_table[path->pathid] = path;
833 } else {
834 iucv_sever_pathid(parm->ctrl.ippathid,
835 iucv_error_pathid);
836 rc = -EIO;
837 }
838 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700839 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800840 return rc;
841}
Heiko Carstensda99f052007-05-04 12:23:27 -0700842EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800843
844/**
845 * iucv_path_quiesce:
846 * @path: address of iucv path structure
847 * @userdata: 16 bytes of data reflected to the communication partner
848 *
849 * This function temporarily suspends incoming messages on an IUCV path.
850 * You can later reactivate the path by invoking the iucv_resume function.
851 *
852 * Returns the result from the CP IUCV call.
853 */
854int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
855{
856 union iucv_param *parm;
857 int rc;
858
859 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100860 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800861 memset(parm, 0, sizeof(union iucv_param));
862 if (userdata)
863 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
864 parm->ctrl.ippathid = path->pathid;
865 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
866 local_bh_enable();
867 return rc;
868}
Heiko Carstensda99f052007-05-04 12:23:27 -0700869EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800870
871/**
872 * iucv_path_resume:
873 * @path: address of iucv path structure
874 * @userdata: 16 bytes of data reflected to the communication partner
875 *
876 * This function resumes incoming messages on an IUCV path that has
877 * been stopped with iucv_path_quiesce.
878 *
879 * Returns the result from the CP IUCV call.
880 */
881int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
882{
883 union iucv_param *parm;
884 int rc;
885
886 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100887 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800888 memset(parm, 0, sizeof(union iucv_param));
889 if (userdata)
890 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
891 parm->ctrl.ippathid = path->pathid;
892 rc = iucv_call_b2f0(IUCV_RESUME, parm);
893 local_bh_enable();
894 return rc;
895}
896
897/**
898 * iucv_path_sever
899 * @path: address of iucv path structure
900 * @userdata: 16 bytes of data reflected to the communication partner
901 *
902 * This function terminates an IUCV path.
903 *
904 * Returns the result from the CP IUCV call.
905 */
906int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
907{
908 int rc;
909
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800910 preempt_disable();
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700911 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800912 spin_lock_bh(&iucv_table_lock);
913 rc = iucv_sever_pathid(path->pathid, userdata);
914 if (!rc) {
915 iucv_path_table[path->pathid] = NULL;
916 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800917 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700918 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800919 spin_unlock_bh(&iucv_table_lock);
920 preempt_enable();
921 return rc;
922}
Heiko Carstensda99f052007-05-04 12:23:27 -0700923EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800924
925/**
926 * iucv_message_purge
927 * @path: address of iucv path structure
928 * @msg: address of iucv msg structure
929 * @srccls: source class of message
930 *
931 * Cancels a message you have sent.
932 *
933 * Returns the result from the CP IUCV call.
934 */
935int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
936 u32 srccls)
937{
938 union iucv_param *parm;
939 int rc;
940
941 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100942 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800943 memset(parm, 0, sizeof(union iucv_param));
944 parm->purge.ippathid = path->pathid;
945 parm->purge.ipmsgid = msg->id;
946 parm->purge.ipsrccls = srccls;
947 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
948 rc = iucv_call_b2f0(IUCV_PURGE, parm);
949 if (!rc) {
950 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
951 msg->tag = parm->purge.ipmsgtag;
952 }
953 local_bh_enable();
954 return rc;
955}
Heiko Carstensda99f052007-05-04 12:23:27 -0700956EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800957
958/**
959 * iucv_message_receive
960 * @path: address of iucv path structure
961 * @msg: address of iucv msg structure
962 * @flags: how the message is received (IUCV_IPBUFLST)
963 * @buffer: address of data buffer or address of struct iucv_array
964 * @size: length of data buffer
965 * @residual:
966 *
967 * This function receives messages that are being sent to you over
968 * established paths. This function will deal with RMDATA messages
969 * embedded in struct iucv_message as well.
970 *
971 * Returns the result from the CP IUCV call.
972 */
973int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
974 u8 flags, void *buffer, size_t size, size_t *residual)
975{
976 union iucv_param *parm;
977 struct iucv_array *array;
978 u8 *rmmsg;
979 size_t copy;
980 int rc;
981
982 if (msg->flags & IUCV_IPRMDATA) {
983 /*
984 * Message is 8 bytes long and has been stored to the
985 * message descriptor itself.
986 */
987 rc = (size < 8) ? 5 : 0;
988 if (residual)
989 *residual = abs(size - 8);
990 rmmsg = msg->rmmsg;
991 if (flags & IUCV_IPBUFLST) {
992 /* Copy to struct iucv_array. */
993 size = (size < 8) ? size : 8;
994 for (array = buffer; size > 0; array++) {
995 copy = min_t(size_t, size, array->length);
996 memcpy((u8 *)(addr_t) array->address,
997 rmmsg, copy);
998 rmmsg += copy;
999 size -= copy;
1000 }
1001 } else {
1002 /* Copy to direct buffer. */
1003 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1004 }
1005 return 0;
1006 }
1007
1008 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001009 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001010 memset(parm, 0, sizeof(union iucv_param));
1011 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1012 parm->db.ipbfln1f = (u32) size;
1013 parm->db.ipmsgid = msg->id;
1014 parm->db.ippathid = path->pathid;
1015 parm->db.iptrgcls = msg->class;
1016 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1017 IUCV_IPFGMID | IUCV_IPTRGCLS);
1018 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1019 if (!rc || rc == 5) {
1020 msg->flags = parm->db.ipflags1;
1021 if (residual)
1022 *residual = parm->db.ipbfln1f;
1023 }
1024 local_bh_enable();
1025 return rc;
1026}
Heiko Carstensda99f052007-05-04 12:23:27 -07001027EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001028
1029/**
1030 * iucv_message_reject
1031 * @path: address of iucv path structure
1032 * @msg: address of iucv msg structure
1033 *
1034 * The reject function refuses a specified message. Between the time you
1035 * are notified of a message and the time that you complete the message,
1036 * the message may be rejected.
1037 *
1038 * Returns the result from the CP IUCV call.
1039 */
1040int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1041{
1042 union iucv_param *parm;
1043 int rc;
1044
1045 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001046 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001047 memset(parm, 0, sizeof(union iucv_param));
1048 parm->db.ippathid = path->pathid;
1049 parm->db.ipmsgid = msg->id;
1050 parm->db.iptrgcls = msg->class;
1051 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1052 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1053 local_bh_enable();
1054 return rc;
1055}
Heiko Carstensda99f052007-05-04 12:23:27 -07001056EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001057
1058/**
1059 * iucv_message_reply
1060 * @path: address of iucv path structure
1061 * @msg: address of iucv msg structure
1062 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1063 * @reply: address of reply data buffer or address of struct iucv_array
1064 * @size: length of reply data buffer
1065 *
1066 * This function responds to the two-way messages that you receive. You
1067 * must identify completely the message to which you wish to reply. ie,
1068 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1069 * the parameter list.
1070 *
1071 * Returns the result from the CP IUCV call.
1072 */
1073int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1074 u8 flags, void *reply, size_t size)
1075{
1076 union iucv_param *parm;
1077 int rc;
1078
1079 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001080 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001081 memset(parm, 0, sizeof(union iucv_param));
1082 if (flags & IUCV_IPRMDATA) {
1083 parm->dpl.ippathid = path->pathid;
1084 parm->dpl.ipflags1 = flags;
1085 parm->dpl.ipmsgid = msg->id;
1086 parm->dpl.iptrgcls = msg->class;
1087 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1088 } else {
1089 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1090 parm->db.ipbfln1f = (u32) size;
1091 parm->db.ippathid = path->pathid;
1092 parm->db.ipflags1 = flags;
1093 parm->db.ipmsgid = msg->id;
1094 parm->db.iptrgcls = msg->class;
1095 }
1096 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1097 local_bh_enable();
1098 return rc;
1099}
Heiko Carstensda99f052007-05-04 12:23:27 -07001100EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001101
1102/**
1103 * iucv_message_send
1104 * @path: address of iucv path structure
1105 * @msg: address of iucv msg structure
1106 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1107 * @srccls: source class of message
1108 * @buffer: address of send buffer or address of struct iucv_array
1109 * @size: length of send buffer
1110 *
1111 * This function transmits data to another application. Data to be
1112 * transmitted is in a buffer and this is a one-way message and the
1113 * receiver will not reply to the message.
1114 *
1115 * Returns the result from the CP IUCV call.
1116 */
1117int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1118 u8 flags, u32 srccls, void *buffer, size_t size)
1119{
1120 union iucv_param *parm;
1121 int rc;
1122
1123 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001124 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001125 memset(parm, 0, sizeof(union iucv_param));
1126 if (flags & IUCV_IPRMDATA) {
1127 /* Message of 8 bytes can be placed into the parameter list. */
1128 parm->dpl.ippathid = path->pathid;
1129 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1130 parm->dpl.iptrgcls = msg->class;
1131 parm->dpl.ipsrccls = srccls;
1132 parm->dpl.ipmsgtag = msg->tag;
1133 memcpy(parm->dpl.iprmmsg, buffer, 8);
1134 } else {
1135 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1136 parm->db.ipbfln1f = (u32) size;
1137 parm->db.ippathid = path->pathid;
1138 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1139 parm->db.iptrgcls = msg->class;
1140 parm->db.ipsrccls = srccls;
1141 parm->db.ipmsgtag = msg->tag;
1142 }
1143 rc = iucv_call_b2f0(IUCV_SEND, parm);
1144 if (!rc)
1145 msg->id = parm->db.ipmsgid;
1146 local_bh_enable();
1147 return rc;
1148}
Heiko Carstensda99f052007-05-04 12:23:27 -07001149EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001150
1151/**
1152 * iucv_message_send2way
1153 * @path: address of iucv path structure
1154 * @msg: address of iucv msg structure
1155 * @flags: how the message is sent and the reply is received
1156 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1157 * @srccls: source class of message
1158 * @buffer: address of send buffer or address of struct iucv_array
1159 * @size: length of send buffer
1160 * @ansbuf: address of answer buffer or address of struct iucv_array
1161 * @asize: size of reply buffer
1162 *
1163 * This function transmits data to another application. Data to be
1164 * transmitted is in a buffer. The receiver of the send is expected to
1165 * reply to the message and a buffer is provided into which IUCV moves
1166 * the reply to this message.
1167 *
1168 * Returns the result from the CP IUCV call.
1169 */
1170int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1171 u8 flags, u32 srccls, void *buffer, size_t size,
1172 void *answer, size_t asize, size_t *residual)
1173{
1174 union iucv_param *parm;
1175 int rc;
1176
1177 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001178 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001179 memset(parm, 0, sizeof(union iucv_param));
1180 if (flags & IUCV_IPRMDATA) {
1181 parm->dpl.ippathid = path->pathid;
1182 parm->dpl.ipflags1 = path->flags; /* priority message */
1183 parm->dpl.iptrgcls = msg->class;
1184 parm->dpl.ipsrccls = srccls;
1185 parm->dpl.ipmsgtag = msg->tag;
1186 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1187 parm->dpl.ipbfln2f = (u32) asize;
1188 memcpy(parm->dpl.iprmmsg, buffer, 8);
1189 } else {
1190 parm->db.ippathid = path->pathid;
1191 parm->db.ipflags1 = path->flags; /* priority message */
1192 parm->db.iptrgcls = msg->class;
1193 parm->db.ipsrccls = srccls;
1194 parm->db.ipmsgtag = msg->tag;
1195 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1196 parm->db.ipbfln1f = (u32) size;
1197 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1198 parm->db.ipbfln2f = (u32) asize;
1199 }
1200 rc = iucv_call_b2f0(IUCV_SEND, parm);
1201 if (!rc)
1202 msg->id = parm->db.ipmsgid;
1203 local_bh_enable();
1204 return rc;
1205}
Heiko Carstensda99f052007-05-04 12:23:27 -07001206EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001207
1208/**
1209 * iucv_path_pending
1210 * @data: Pointer to external interrupt buffer
1211 *
1212 * Process connection pending work item. Called from tasklet while holding
1213 * iucv_table_lock.
1214 */
1215struct iucv_path_pending {
1216 u16 ippathid;
1217 u8 ipflags1;
1218 u8 iptype;
1219 u16 ipmsglim;
1220 u16 res1;
1221 u8 ipvmid[8];
1222 u8 ipuser[16];
1223 u32 res3;
1224 u8 ippollfg;
1225 u8 res4[3];
1226} __attribute__ ((packed));
1227
1228static void iucv_path_pending(struct iucv_irq_data *data)
1229{
1230 struct iucv_path_pending *ipp = (void *) data;
1231 struct iucv_handler *handler;
1232 struct iucv_path *path;
1233 char *error;
1234
1235 BUG_ON(iucv_path_table[ipp->ippathid]);
1236 /* New pathid, handler found. Create a new path struct. */
1237 error = iucv_error_no_memory;
1238 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1239 if (!path)
1240 goto out_sever;
1241 path->pathid = ipp->ippathid;
1242 iucv_path_table[path->pathid] = path;
1243 EBCASC(ipp->ipvmid, 8);
1244
1245 /* Call registered handler until one is found that wants the path. */
1246 list_for_each_entry(handler, &iucv_handler_list, list) {
1247 if (!handler->path_pending)
1248 continue;
1249 /*
1250 * Add path to handler to allow a call to iucv_path_sever
1251 * inside the path_pending function. If the handler returns
1252 * an error remove the path from the handler again.
1253 */
1254 list_add(&path->list, &handler->paths);
1255 path->handler = handler;
1256 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1257 return;
1258 list_del(&path->list);
1259 path->handler = NULL;
1260 }
1261 /* No handler wanted the path. */
1262 iucv_path_table[path->pathid] = NULL;
1263 iucv_path_free(path);
1264 error = iucv_error_no_listener;
1265out_sever:
1266 iucv_sever_pathid(ipp->ippathid, error);
1267}
1268
1269/**
1270 * iucv_path_complete
1271 * @data: Pointer to external interrupt buffer
1272 *
1273 * Process connection complete work item. Called from tasklet while holding
1274 * iucv_table_lock.
1275 */
1276struct iucv_path_complete {
1277 u16 ippathid;
1278 u8 ipflags1;
1279 u8 iptype;
1280 u16 ipmsglim;
1281 u16 res1;
1282 u8 res2[8];
1283 u8 ipuser[16];
1284 u32 res3;
1285 u8 ippollfg;
1286 u8 res4[3];
1287} __attribute__ ((packed));
1288
1289static void iucv_path_complete(struct iucv_irq_data *data)
1290{
1291 struct iucv_path_complete *ipc = (void *) data;
1292 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1293
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001294 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001295 path->handler->path_complete(path, ipc->ipuser);
1296}
1297
1298/**
1299 * iucv_path_severed
1300 * @data: Pointer to external interrupt buffer
1301 *
1302 * Process connection severed work item. Called from tasklet while holding
1303 * iucv_table_lock.
1304 */
1305struct iucv_path_severed {
1306 u16 ippathid;
1307 u8 res1;
1308 u8 iptype;
1309 u32 res2;
1310 u8 res3[8];
1311 u8 ipuser[16];
1312 u32 res4;
1313 u8 ippollfg;
1314 u8 res5[3];
1315} __attribute__ ((packed));
1316
1317static void iucv_path_severed(struct iucv_irq_data *data)
1318{
1319 struct iucv_path_severed *ips = (void *) data;
1320 struct iucv_path *path = iucv_path_table[ips->ippathid];
1321
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001322 if (!path || !path->handler) /* Already severed */
1323 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001324 if (path->handler->path_severed)
1325 path->handler->path_severed(path, ips->ipuser);
1326 else {
1327 iucv_sever_pathid(path->pathid, NULL);
1328 iucv_path_table[path->pathid] = NULL;
1329 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001330 iucv_path_free(path);
1331 }
1332}
1333
1334/**
1335 * iucv_path_quiesced
1336 * @data: Pointer to external interrupt buffer
1337 *
1338 * Process connection quiesced work item. Called from tasklet while holding
1339 * iucv_table_lock.
1340 */
1341struct iucv_path_quiesced {
1342 u16 ippathid;
1343 u8 res1;
1344 u8 iptype;
1345 u32 res2;
1346 u8 res3[8];
1347 u8 ipuser[16];
1348 u32 res4;
1349 u8 ippollfg;
1350 u8 res5[3];
1351} __attribute__ ((packed));
1352
1353static void iucv_path_quiesced(struct iucv_irq_data *data)
1354{
1355 struct iucv_path_quiesced *ipq = (void *) data;
1356 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1357
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001358 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001359 path->handler->path_quiesced(path, ipq->ipuser);
1360}
1361
1362/**
1363 * iucv_path_resumed
1364 * @data: Pointer to external interrupt buffer
1365 *
1366 * Process connection resumed work item. Called from tasklet while holding
1367 * iucv_table_lock.
1368 */
1369struct iucv_path_resumed {
1370 u16 ippathid;
1371 u8 res1;
1372 u8 iptype;
1373 u32 res2;
1374 u8 res3[8];
1375 u8 ipuser[16];
1376 u32 res4;
1377 u8 ippollfg;
1378 u8 res5[3];
1379} __attribute__ ((packed));
1380
1381static void iucv_path_resumed(struct iucv_irq_data *data)
1382{
1383 struct iucv_path_resumed *ipr = (void *) data;
1384 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1385
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001386 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001387 path->handler->path_resumed(path, ipr->ipuser);
1388}
1389
1390/**
1391 * iucv_message_complete
1392 * @data: Pointer to external interrupt buffer
1393 *
1394 * Process message complete work item. Called from tasklet while holding
1395 * iucv_table_lock.
1396 */
1397struct iucv_message_complete {
1398 u16 ippathid;
1399 u8 ipflags1;
1400 u8 iptype;
1401 u32 ipmsgid;
1402 u32 ipaudit;
1403 u8 iprmmsg[8];
1404 u32 ipsrccls;
1405 u32 ipmsgtag;
1406 u32 res;
1407 u32 ipbfln2f;
1408 u8 ippollfg;
1409 u8 res2[3];
1410} __attribute__ ((packed));
1411
1412static void iucv_message_complete(struct iucv_irq_data *data)
1413{
1414 struct iucv_message_complete *imc = (void *) data;
1415 struct iucv_path *path = iucv_path_table[imc->ippathid];
1416 struct iucv_message msg;
1417
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001418 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001419 msg.flags = imc->ipflags1;
1420 msg.id = imc->ipmsgid;
1421 msg.audit = imc->ipaudit;
1422 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1423 msg.class = imc->ipsrccls;
1424 msg.tag = imc->ipmsgtag;
1425 msg.length = imc->ipbfln2f;
1426 path->handler->message_complete(path, &msg);
1427 }
1428}
1429
1430/**
1431 * iucv_message_pending
1432 * @data: Pointer to external interrupt buffer
1433 *
1434 * Process message pending work item. Called from tasklet while holding
1435 * iucv_table_lock.
1436 */
1437struct iucv_message_pending {
1438 u16 ippathid;
1439 u8 ipflags1;
1440 u8 iptype;
1441 u32 ipmsgid;
1442 u32 iptrgcls;
1443 union {
1444 u32 iprmmsg1_u32;
1445 u8 iprmmsg1[4];
1446 } ln1msg1;
1447 union {
1448 u32 ipbfln1f;
1449 u8 iprmmsg2[4];
1450 } ln1msg2;
1451 u32 res1[3];
1452 u32 ipbfln2f;
1453 u8 ippollfg;
1454 u8 res2[3];
1455} __attribute__ ((packed));
1456
1457static void iucv_message_pending(struct iucv_irq_data *data)
1458{
1459 struct iucv_message_pending *imp = (void *) data;
1460 struct iucv_path *path = iucv_path_table[imp->ippathid];
1461 struct iucv_message msg;
1462
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001463 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001464 msg.flags = imp->ipflags1;
1465 msg.id = imp->ipmsgid;
1466 msg.class = imp->iptrgcls;
1467 if (imp->ipflags1 & IUCV_IPRMDATA) {
1468 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1469 msg.length = 8;
1470 } else
1471 msg.length = imp->ln1msg2.ipbfln1f;
1472 msg.reply_size = imp->ipbfln2f;
1473 path->handler->message_pending(path, &msg);
1474 }
1475}
1476
1477/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001478 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001479 *
1480 * This tasklet loops over the queue of irq buffers created by
1481 * iucv_external_interrupt, calls the appropriate action handler
1482 * and then frees the buffer.
1483 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001484static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001485{
1486 typedef void iucv_irq_fn(struct iucv_irq_data *);
1487 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001488 [0x02] = iucv_path_complete,
1489 [0x03] = iucv_path_severed,
1490 [0x04] = iucv_path_quiesced,
1491 [0x05] = iucv_path_resumed,
1492 [0x06] = iucv_message_complete,
1493 [0x07] = iucv_message_complete,
1494 [0x08] = iucv_message_pending,
1495 [0x09] = iucv_message_pending,
1496 };
Denis Chengb5e78332007-12-07 00:51:45 -08001497 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001498 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001499
1500 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001501 if (!spin_trylock(&iucv_table_lock)) {
1502 tasklet_schedule(&iucv_tasklet);
1503 return;
1504 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001505 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001506
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001507 spin_lock_irq(&iucv_queue_lock);
1508 list_splice_init(&iucv_task_queue, &task_queue);
1509 spin_unlock_irq(&iucv_queue_lock);
1510
1511 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001512 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001513 irq_fn[p->data.iptype](&p->data);
1514 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001515 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001516
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001517 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001518 spin_unlock(&iucv_table_lock);
1519}
1520
1521/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001522 * iucv_work_fn:
1523 *
1524 * This work function loops over the queue of path pending irq blocks
1525 * created by iucv_external_interrupt, calls the appropriate action
1526 * handler and then frees the buffer.
1527 */
1528static void iucv_work_fn(struct work_struct *work)
1529{
1530 typedef void iucv_irq_fn(struct iucv_irq_data *);
Denis Chengb5e78332007-12-07 00:51:45 -08001531 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001532 struct iucv_irq_list *p, *n;
1533
1534 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1535 spin_lock_bh(&iucv_table_lock);
1536 iucv_active_cpu = smp_processor_id();
1537
1538 spin_lock_irq(&iucv_queue_lock);
1539 list_splice_init(&iucv_work_queue, &work_queue);
1540 spin_unlock_irq(&iucv_queue_lock);
1541
1542 iucv_cleanup_queue();
1543 list_for_each_entry_safe(p, n, &work_queue, list) {
1544 list_del_init(&p->list);
1545 iucv_path_pending(&p->data);
1546 kfree(p);
1547 }
1548
1549 iucv_active_cpu = -1;
1550 spin_unlock_bh(&iucv_table_lock);
1551}
1552
1553/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001554 * iucv_external_interrupt
1555 * @code: irq code
1556 *
1557 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001558 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001559 */
1560static void iucv_external_interrupt(u16 code)
1561{
1562 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001563 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001564
Christoph Lameter70cf50352007-11-20 11:13:38 +01001565 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001566 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001567 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001568 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1569 return;
1570 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001571 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001572 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001573 if (!work) {
1574 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1575 return;
1576 }
1577 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001578 spin_lock(&iucv_queue_lock);
1579 if (p->iptype == 0x01) {
1580 /* Path pending interrupt. */
1581 list_add_tail(&work->list, &iucv_work_queue);
1582 schedule_work(&iucv_work);
1583 } else {
1584 /* The other interrupts. */
1585 list_add_tail(&work->list, &iucv_task_queue);
1586 tasklet_schedule(&iucv_tasklet);
1587 }
1588 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001589}
1590
1591/**
1592 * iucv_init
1593 *
1594 * Allocates and initializes various data structures.
1595 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001596static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001597{
1598 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001599 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001600
1601 if (!MACHINE_IS_VM) {
1602 rc = -EPROTONOSUPPORT;
1603 goto out;
1604 }
1605 rc = iucv_query_maxconn();
1606 if (rc)
1607 goto out;
Heiko Carstensda99f052007-05-04 12:23:27 -07001608 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001609 if (rc)
1610 goto out;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001611 iucv_root = s390_root_dev_register("iucv");
1612 if (IS_ERR(iucv_root)) {
1613 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001614 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001615 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001616
1617 for_each_online_cpu(cpu) {
1618 /* Note: GFP_DMA used to get memory below 2G */
1619 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1620 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1621 if (!iucv_irq_data[cpu]) {
1622 rc = -ENOMEM;
1623 goto out_free;
1624 }
1625
1626 /* Allocate parameter blocks. */
1627 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1628 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1629 if (!iucv_param[cpu]) {
1630 rc = -ENOMEM;
1631 goto out_free;
1632 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001633 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001634 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1635 if (rc)
1636 goto out_free;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001637 ASCEBC(iucv_error_no_listener, 16);
1638 ASCEBC(iucv_error_no_memory, 16);
1639 ASCEBC(iucv_error_pathid, 16);
1640 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001641 rc = bus_register(&iucv_bus);
1642 if (rc)
1643 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001644 return 0;
1645
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001646out_cpu:
1647 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001648out_free:
1649 for_each_possible_cpu(cpu) {
1650 kfree(iucv_param[cpu]);
1651 iucv_param[cpu] = NULL;
1652 kfree(iucv_irq_data[cpu]);
1653 iucv_irq_data[cpu] = NULL;
1654 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001655 s390_root_dev_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001656out_int:
1657 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1658out:
1659 return rc;
1660}
1661
1662/**
1663 * iucv_exit
1664 *
1665 * Frees everything allocated from iucv_init.
1666 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001667static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001668{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001669 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001670 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001671
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001672 spin_lock_irq(&iucv_queue_lock);
1673 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1674 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001675 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1676 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001677 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001678 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001679 for_each_possible_cpu(cpu) {
1680 kfree(iucv_param[cpu]);
1681 iucv_param[cpu] = NULL;
1682 kfree(iucv_irq_data[cpu]);
1683 iucv_irq_data[cpu] = NULL;
1684 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001685 s390_root_dev_unregister(iucv_root);
1686 bus_unregister(&iucv_bus);
1687 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1688}
1689
1690subsys_initcall(iucv_init);
1691module_exit(iucv_exit);
1692
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001693MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1694MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1695MODULE_LICENSE("GPL");