blob: 3ad1f9db5f8b697167c8ed1ed249567f36ccf008 [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
Heiko Carstens052ff462011-01-05 12:47:28 +010039#include <linux/kernel_stat.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080040#include <linux/module.h>
41#include <linux/moduleparam.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080042#include <linux/spinlock.h>
43#include <linux/kernel.h>
44#include <linux/slab.h>
45#include <linux/init.h>
46#include <linux/interrupt.h>
47#include <linux/list.h>
48#include <linux/errno.h>
49#include <linux/err.h>
50#include <linux/device.h>
51#include <linux/cpu.h>
Ursula Braun6c005962009-06-16 10:30:41 +020052#include <linux/reboot.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080053#include <net/iucv/iucv.h>
Arun Sharma600634972011-07-26 16:09:06 -070054#include <linux/atomic.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080055#include <asm/ebcdic.h>
56#include <asm/io.h>
Heiko Carstensd7b250e2011-05-26 09:48:24 +020057#include <asm/irq.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080058#include <asm/smp.h>
59
60/*
61 * FLAGS:
62 * All flags are defined in the field IPFLAGS1 of each function
63 * and can be found in CP Programming Services.
64 * IPSRCCLS - Indicates you have specified a source class.
65 * IPTRGCLS - Indicates you have specified a target class.
66 * IPFGPID - Indicates you have specified a pathid.
67 * IPFGMID - Indicates you have specified a message ID.
68 * IPNORPY - Indicates a one-way message. No reply expected.
69 * IPALL - Indicates that all paths are affected.
70 */
71#define IUCV_IPSRCCLS 0x01
72#define IUCV_IPTRGCLS 0x01
73#define IUCV_IPFGPID 0x02
74#define IUCV_IPFGMID 0x04
75#define IUCV_IPNORPY 0x10
76#define IUCV_IPALL 0x80
77
Heiko Carstensda99f052007-05-04 12:23:27 -070078static int iucv_bus_match(struct device *dev, struct device_driver *drv)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080079{
80 return 0;
81}
82
Ursula Braun4c89d862009-09-16 04:37:22 +000083enum iucv_pm_states {
84 IUCV_PM_INITIAL = 0,
85 IUCV_PM_FREEZING = 1,
86 IUCV_PM_THAWING = 2,
87 IUCV_PM_RESTORING = 3,
88};
89static enum iucv_pm_states iucv_pm_state;
90
Ursula Braun672e4052009-06-16 10:30:42 +020091static int iucv_pm_prepare(struct device *);
92static void iucv_pm_complete(struct device *);
93static int iucv_pm_freeze(struct device *);
94static int iucv_pm_thaw(struct device *);
95static int iucv_pm_restore(struct device *);
96
Alexey Dobriyan47145212009-12-14 18:00:08 -080097static const struct dev_pm_ops iucv_pm_ops = {
Ursula Braun672e4052009-06-16 10:30:42 +020098 .prepare = iucv_pm_prepare,
99 .complete = iucv_pm_complete,
100 .freeze = iucv_pm_freeze,
101 .thaw = iucv_pm_thaw,
102 .restore = iucv_pm_restore,
103};
104
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800105struct bus_type iucv_bus = {
106 .name = "iucv",
107 .match = iucv_bus_match,
Ursula Braun672e4052009-06-16 10:30:42 +0200108 .pm = &iucv_pm_ops,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800109};
Heiko Carstensda99f052007-05-04 12:23:27 -0700110EXPORT_SYMBOL(iucv_bus);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800111
112struct device *iucv_root;
Heiko Carstensda99f052007-05-04 12:23:27 -0700113EXPORT_SYMBOL(iucv_root);
114
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800115static int iucv_available;
116
117/* General IUCV interrupt structure */
118struct iucv_irq_data {
119 u16 ippathid;
120 u8 ipflags1;
121 u8 iptype;
122 u32 res2[8];
123};
124
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700125struct iucv_irq_list {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800126 struct list_head list;
127 struct iucv_irq_data data;
128};
129
Christoph Lameter70cf50352007-11-20 11:13:38 +0100130static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000131static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE };
132static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE };
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800133
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700134/*
135 * Queue of interrupt buffers lock for delivery via the tasklet
136 * (fast but can't call smp_call_function).
137 */
138static LIST_HEAD(iucv_task_queue);
139
140/*
141 * The tasklet for fast delivery of iucv interrupts.
142 */
143static void iucv_tasklet_fn(unsigned long);
144static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
145
146/*
147 * Queue of interrupt buffers for delivery via a work queue
148 * (slower but can call smp_call_function).
149 */
150static LIST_HEAD(iucv_work_queue);
151
152/*
153 * The work element to deliver path pending interrupts.
154 */
155static void iucv_work_fn(struct work_struct *work);
156static DECLARE_WORK(iucv_work, iucv_work_fn);
157
158/*
159 * Spinlock protecting task and work queue.
160 */
161static DEFINE_SPINLOCK(iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800162
163enum iucv_command_codes {
164 IUCV_QUERY = 0,
165 IUCV_RETRIEVE_BUFFER = 2,
166 IUCV_SEND = 4,
167 IUCV_RECEIVE = 5,
168 IUCV_REPLY = 6,
169 IUCV_REJECT = 8,
170 IUCV_PURGE = 9,
171 IUCV_ACCEPT = 10,
172 IUCV_CONNECT = 11,
173 IUCV_DECLARE_BUFFER = 12,
174 IUCV_QUIESCE = 13,
175 IUCV_RESUME = 14,
176 IUCV_SEVER = 15,
177 IUCV_SETMASK = 16,
Ursula Braun672e4052009-06-16 10:30:42 +0200178 IUCV_SETCONTROLMASK = 17,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800179};
180
181/*
182 * Error messages that are used with the iucv_sever function. They get
183 * converted to EBCDIC.
184 */
185static char iucv_error_no_listener[16] = "NO LISTENER";
186static char iucv_error_no_memory[16] = "NO MEMORY";
187static char iucv_error_pathid[16] = "INVALID PATHID";
188
189/*
190 * iucv_handler_list: List of registered handlers.
191 */
192static LIST_HEAD(iucv_handler_list);
193
194/*
195 * iucv_path_table: an array of iucv_path structures.
196 */
197static struct iucv_path **iucv_path_table;
198static unsigned long iucv_max_pathid;
199
200/*
201 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
202 */
203static DEFINE_SPINLOCK(iucv_table_lock);
204
205/*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700206 * iucv_active_cpu: contains the number of the cpu executing the tasklet
207 * or the work handler. Needed for iucv_path_sever called from tasklet.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800208 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700209static int iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800210
211/*
212 * Mutex and wait queue for iucv_register/iucv_unregister.
213 */
214static DEFINE_MUTEX(iucv_register_mutex);
215
216/*
217 * Counter for number of non-smp capable handlers.
218 */
219static int iucv_nonsmp_handler;
220
221/*
222 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
223 * iucv_path_quiesce and iucv_path_sever.
224 */
225struct iucv_cmd_control {
226 u16 ippathid;
227 u8 ipflags1;
228 u8 iprcode;
229 u16 ipmsglim;
230 u16 res1;
231 u8 ipvmid[8];
232 u8 ipuser[16];
233 u8 iptarget[8];
234} __attribute__ ((packed,aligned(8)));
235
236/*
237 * Data in parameter list iucv structure. Used by iucv_message_send,
238 * iucv_message_send2way and iucv_message_reply.
239 */
240struct iucv_cmd_dpl {
241 u16 ippathid;
242 u8 ipflags1;
243 u8 iprcode;
244 u32 ipmsgid;
245 u32 iptrgcls;
246 u8 iprmmsg[8];
247 u32 ipsrccls;
248 u32 ipmsgtag;
249 u32 ipbfadr2;
250 u32 ipbfln2f;
251 u32 res;
252} __attribute__ ((packed,aligned(8)));
253
254/*
255 * Data in buffer iucv structure. Used by iucv_message_receive,
256 * iucv_message_reject, iucv_message_send, iucv_message_send2way
257 * and iucv_declare_cpu.
258 */
259struct iucv_cmd_db {
260 u16 ippathid;
261 u8 ipflags1;
262 u8 iprcode;
263 u32 ipmsgid;
264 u32 iptrgcls;
265 u32 ipbfadr1;
266 u32 ipbfln1f;
267 u32 ipsrccls;
268 u32 ipmsgtag;
269 u32 ipbfadr2;
270 u32 ipbfln2f;
271 u32 res;
272} __attribute__ ((packed,aligned(8)));
273
274/*
275 * Purge message iucv structure. Used by iucv_message_purge.
276 */
277struct iucv_cmd_purge {
278 u16 ippathid;
279 u8 ipflags1;
280 u8 iprcode;
281 u32 ipmsgid;
282 u8 ipaudit[3];
283 u8 res1[5];
284 u32 res2;
285 u32 ipsrccls;
286 u32 ipmsgtag;
287 u32 res3[3];
288} __attribute__ ((packed,aligned(8)));
289
290/*
291 * Set mask iucv structure. Used by iucv_enable_cpu.
292 */
293struct iucv_cmd_set_mask {
294 u8 ipmask;
295 u8 res1[2];
296 u8 iprcode;
297 u32 res2[9];
298} __attribute__ ((packed,aligned(8)));
299
300union iucv_param {
301 struct iucv_cmd_control ctrl;
302 struct iucv_cmd_dpl dpl;
303 struct iucv_cmd_db db;
304 struct iucv_cmd_purge purge;
305 struct iucv_cmd_set_mask set_mask;
306};
307
308/*
309 * Anchor for per-cpu IUCV command parameter block.
310 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100311static union iucv_param *iucv_param[NR_CPUS];
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000312static union iucv_param *iucv_param_irq[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800313
314/**
315 * iucv_call_b2f0
316 * @code: identifier of IUCV call to CP.
317 * @parm: pointer to a struct iucv_parm block
318 *
319 * Calls CP to execute IUCV commands.
320 *
321 * Returns the result of the CP IUCV call.
322 */
323static inline int iucv_call_b2f0(int command, union iucv_param *parm)
324{
325 register unsigned long reg0 asm ("0");
326 register unsigned long reg1 asm ("1");
327 int ccode;
328
329 reg0 = command;
330 reg1 = virt_to_phys(parm);
331 asm volatile(
332 " .long 0xb2f01000\n"
333 " ipm %0\n"
334 " srl %0,28\n"
335 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
336 : "m" (*parm) : "cc");
337 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
338}
339
340/**
341 * iucv_query_maxconn
342 *
343 * Determines the maximum number of connections that may be established.
344 *
345 * Returns the maximum number of connections or -EPERM is IUCV is not
346 * available.
347 */
348static int iucv_query_maxconn(void)
349{
350 register unsigned long reg0 asm ("0");
351 register unsigned long reg1 asm ("1");
352 void *param;
353 int ccode;
354
355 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
356 if (!param)
357 return -ENOMEM;
358 reg0 = IUCV_QUERY;
359 reg1 = (unsigned long) param;
360 asm volatile (
361 " .long 0xb2f01000\n"
362 " ipm %0\n"
363 " srl %0,28\n"
364 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
365 if (ccode == 0)
Hendrik Bruecknerb29e4da2009-09-16 04:37:24 +0000366 iucv_max_pathid = reg1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800367 kfree(param);
368 return ccode ? -EPERM : 0;
369}
370
371/**
372 * iucv_allow_cpu
373 * @data: unused
374 *
375 * Allow iucv interrupts on this cpu.
376 */
377static void iucv_allow_cpu(void *data)
378{
379 int cpu = smp_processor_id();
380 union iucv_param *parm;
381
382 /*
383 * Enable all iucv interrupts.
384 * ipmask contains bits for the different interrupts
385 * 0x80 - Flag to allow nonpriority message pending interrupts
386 * 0x40 - Flag to allow priority message pending interrupts
387 * 0x20 - Flag to allow nonpriority message completion interrupts
388 * 0x10 - Flag to allow priority message completion interrupts
389 * 0x08 - Flag to allow IUCV control interrupts
390 */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000391 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800392 memset(parm, 0, sizeof(union iucv_param));
393 parm->set_mask.ipmask = 0xf8;
394 iucv_call_b2f0(IUCV_SETMASK, parm);
395
Ursula Braun672e4052009-06-16 10:30:42 +0200396 /*
397 * Enable all iucv control interrupts.
398 * ipmask contains bits for the different interrupts
399 * 0x80 - Flag to allow pending connections interrupts
400 * 0x40 - Flag to allow connection complete interrupts
401 * 0x20 - Flag to allow connection severed interrupts
402 * 0x10 - Flag to allow connection quiesced interrupts
403 * 0x08 - Flag to allow connection resumed interrupts
404 */
405 memset(parm, 0, sizeof(union iucv_param));
406 parm->set_mask.ipmask = 0xf8;
407 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800408 /* Set indication that iucv interrupts are allowed for this cpu. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000409 cpumask_set_cpu(cpu, &iucv_irq_cpumask);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800410}
411
412/**
413 * iucv_block_cpu
414 * @data: unused
415 *
416 * Block iucv interrupts on this cpu.
417 */
418static void iucv_block_cpu(void *data)
419{
420 int cpu = smp_processor_id();
421 union iucv_param *parm;
422
423 /* Disable all iucv interrupts. */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000424 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800425 memset(parm, 0, sizeof(union iucv_param));
426 iucv_call_b2f0(IUCV_SETMASK, parm);
427
428 /* Clear indication that iucv interrupts are allowed for this cpu. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000429 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800430}
431
432/**
Ursula Braun672e4052009-06-16 10:30:42 +0200433 * iucv_block_cpu_almost
434 * @data: unused
435 *
436 * Allow connection-severed interrupts only on this cpu.
437 */
438static void iucv_block_cpu_almost(void *data)
439{
440 int cpu = smp_processor_id();
441 union iucv_param *parm;
442
443 /* Allow iucv control interrupts only */
444 parm = iucv_param_irq[cpu];
445 memset(parm, 0, sizeof(union iucv_param));
446 parm->set_mask.ipmask = 0x08;
447 iucv_call_b2f0(IUCV_SETMASK, parm);
448 /* Allow iucv-severed interrupt only */
449 memset(parm, 0, sizeof(union iucv_param));
450 parm->set_mask.ipmask = 0x20;
451 iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
452
453 /* Clear indication that iucv interrupts are allowed for this cpu. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000454 cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
Ursula Braun672e4052009-06-16 10:30:42 +0200455}
456
457/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800458 * iucv_declare_cpu
459 * @data: unused
460 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200461 * Declare a interrupt buffer on this cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800462 */
463static void iucv_declare_cpu(void *data)
464{
465 int cpu = smp_processor_id();
466 union iucv_param *parm;
467 int rc;
468
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000469 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800470 return;
471
472 /* Declare interrupt buffer. */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000473 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800474 memset(parm, 0, sizeof(union iucv_param));
Christoph Lameter70cf50352007-11-20 11:13:38 +0100475 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800476 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
477 if (rc) {
478 char *err = "Unknown";
Heiko Carstensda99f052007-05-04 12:23:27 -0700479 switch (rc) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800480 case 0x03:
481 err = "Directory error";
482 break;
483 case 0x0a:
484 err = "Invalid length";
485 break;
486 case 0x13:
487 err = "Buffer already exists";
488 break;
489 case 0x3e:
490 err = "Buffer overlap";
491 break;
492 case 0x5c:
493 err = "Paging or storage error";
494 break;
495 }
Ursula Braun8f7c5022008-12-25 13:39:47 +0100496 pr_warning("Defining an interrupt buffer on CPU %i"
497 " failed with 0x%02x (%s)\n", cpu, rc, err);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800498 return;
499 }
500
501 /* Set indication that an iucv buffer exists for this cpu. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000502 cpumask_set_cpu(cpu, &iucv_buffer_cpumask);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800503
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000504 if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask))
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800505 /* Enable iucv interrupts on this cpu. */
506 iucv_allow_cpu(NULL);
507 else
508 /* Disable iucv interrupts on this cpu. */
509 iucv_block_cpu(NULL);
510}
511
512/**
513 * iucv_retrieve_cpu
514 * @data: unused
515 *
516 * Retrieve interrupt buffer on this cpu.
517 */
518static void iucv_retrieve_cpu(void *data)
519{
520 int cpu = smp_processor_id();
521 union iucv_param *parm;
522
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000523 if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask))
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800524 return;
525
526 /* Block iucv interrupts. */
527 iucv_block_cpu(NULL);
528
529 /* Retrieve interrupt buffer. */
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000530 parm = iucv_param_irq[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800531 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
532
533 /* Clear indication that an iucv buffer exists for this cpu. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000534 cpumask_clear_cpu(cpu, &iucv_buffer_cpumask);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800535}
536
537/**
538 * iucv_setmask_smp
539 *
540 * Allow iucv interrupts on all cpus.
541 */
542static void iucv_setmask_mp(void)
543{
544 int cpu;
545
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700546 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800547 for_each_online_cpu(cpu)
548 /* Enable all cpus with a declared buffer. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000549 if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) &&
550 !cpumask_test_cpu(cpu, &iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200551 smp_call_function_single(cpu, iucv_allow_cpu,
Jens Axboe8691e5a2008-06-06 11:18:06 +0200552 NULL, 1);
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700553 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800554}
555
556/**
557 * iucv_setmask_up
558 *
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700559 * Allow iucv interrupts on a single cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800560 */
561static void iucv_setmask_up(void)
562{
563 cpumask_t cpumask;
564 int cpu;
565
566 /* Disable all cpu but the first in cpu_irq_cpumask. */
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000567 cpumask_copy(&cpumask, &iucv_irq_cpumask);
568 cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask);
569 for_each_cpu(cpu, &cpumask)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200570 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800571}
572
573/**
574 * iucv_enable
575 *
576 * This function makes iucv ready for use. It allocates the pathid
577 * table, declares an iucv interrupt buffer and enables the iucv
578 * interrupts. Called when the first user has registered an iucv
579 * handler.
580 */
581static int iucv_enable(void)
582{
583 size_t alloc_size;
584 int cpu, rc;
585
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800586 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800587 rc = -ENOMEM;
588 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
589 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
590 if (!iucv_path_table)
591 goto out;
592 /* Declare per cpu buffers. */
593 rc = -EIO;
594 for_each_online_cpu(cpu)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200595 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000596 if (cpumask_empty(&iucv_buffer_cpumask))
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800597 /* No cpu could declare an iucv buffer. */
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800598 goto out;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700599 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800600 return 0;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800601out:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800602 kfree(iucv_path_table);
603 iucv_path_table = NULL;
604 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800605 return rc;
606}
607
608/**
609 * iucv_disable
610 *
611 * This function shuts down iucv. It disables iucv interrupts, retrieves
612 * the iucv interrupt buffer and frees the pathid table. Called after the
613 * last user unregister its iucv handler.
614 */
615static void iucv_disable(void)
616{
Heiko Carstens8b122ef2008-09-30 03:03:35 -0700617 get_online_cpus();
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200618 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800619 kfree(iucv_path_table);
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800620 iucv_path_table = NULL;
621 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800622}
623
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800624static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
625 unsigned long action, void *hcpu)
626{
627 cpumask_t cpumask;
628 long cpu = (long) hcpu;
629
630 switch (action) {
631 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700632 case CPU_UP_PREPARE_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100633 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
634 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
635 if (!iucv_irq_data[cpu])
Akinobu Mita92e99a92010-05-26 14:43:33 -0700636 return notifier_from_errno(-ENOMEM);
637
Christoph Lameter70cf50352007-11-20 11:13:38 +0100638 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
639 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
Akinobu Mitad0236f82008-07-15 02:09:53 -0700640 if (!iucv_param[cpu]) {
641 kfree(iucv_irq_data[cpu]);
642 iucv_irq_data[cpu] = NULL;
Akinobu Mita92e99a92010-05-26 14:43:33 -0700643 return notifier_from_errno(-ENOMEM);
Akinobu Mitad0236f82008-07-15 02:09:53 -0700644 }
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000645 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
646 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
647 if (!iucv_param_irq[cpu]) {
648 kfree(iucv_param[cpu]);
649 iucv_param[cpu] = NULL;
650 kfree(iucv_irq_data[cpu]);
651 iucv_irq_data[cpu] = NULL;
Akinobu Mita92e99a92010-05-26 14:43:33 -0700652 return notifier_from_errno(-ENOMEM);
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000653 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800654 break;
655 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700656 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800657 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700658 case CPU_DEAD_FROZEN:
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000659 kfree(iucv_param_irq[cpu]);
660 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +0100661 kfree(iucv_param[cpu]);
662 iucv_param[cpu] = NULL;
663 kfree(iucv_irq_data[cpu]);
664 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800665 break;
666 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700667 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800668 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700669 case CPU_DOWN_FAILED_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800670 if (!iucv_path_table)
671 break;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200672 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800673 break;
674 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700675 case CPU_DOWN_PREPARE_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800676 if (!iucv_path_table)
677 break;
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000678 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
679 cpumask_clear_cpu(cpu, &cpumask);
680 if (cpumask_empty(&cpumask))
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800681 /* Can't offline last IUCV enabled cpu. */
Akinobu Mita92e99a92010-05-26 14:43:33 -0700682 return notifier_from_errno(-EINVAL);
Jens Axboe8691e5a2008-06-06 11:18:06 +0200683 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000684 if (cpumask_empty(&iucv_irq_cpumask))
685 smp_call_function_single(
686 cpumask_first(&iucv_buffer_cpumask),
687 iucv_allow_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800688 break;
689 }
690 return NOTIFY_OK;
691}
692
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700693static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800694 .notifier_call = iucv_cpu_notify,
695};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800696
697/**
698 * iucv_sever_pathid
699 * @pathid: path identification number.
700 * @userdata: 16-bytes of user data.
701 *
702 * Sever an iucv path to free up the pathid. Used internally.
703 */
704static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
705{
706 union iucv_param *parm;
707
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000708 parm = iucv_param_irq[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800709 memset(parm, 0, sizeof(union iucv_param));
710 if (userdata)
711 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
712 parm->ctrl.ippathid = pathid;
713 return iucv_call_b2f0(IUCV_SEVER, parm);
714}
715
716/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700717 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800718 * @dummy: unused dummy argument
719 *
720 * Nop function called via smp_call_function to force work items from
721 * pending external iucv interrupts to the work queue.
722 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700723static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800724{
725}
726
727/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700728 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800729 *
730 * Function called after a path has been severed to find all remaining
731 * work items for the now stale pathid. The caller needs to hold the
732 * iucv_table_lock.
733 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700734static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800735{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700736 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800737
738 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300739 * When a path is severed, the pathid can be reused immediately
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700740 * on a iucv connect or a connection pending interrupt. Remove
741 * all entries from the task queue that refer to a stale pathid
742 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
743 * or deliver the connection pending interrupt. To get all the
744 * pending interrupts force them to the work queue by calling
745 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800746 */
Jens Axboe8691e5a2008-06-06 11:18:06 +0200747 smp_call_function(__iucv_cleanup_queue, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700748 spin_lock_irq(&iucv_queue_lock);
749 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
750 /* Remove stale work items from the task queue. */
751 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800752 list_del(&p->list);
753 kfree(p);
754 }
755 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700756 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800757}
758
759/**
760 * iucv_register:
761 * @handler: address of iucv handler structure
762 * @smp: != 0 indicates that the handler can deal with out of order messages
763 *
764 * Registers a driver with IUCV.
765 *
766 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
767 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
768 */
769int iucv_register(struct iucv_handler *handler, int smp)
770{
771 int rc;
772
773 if (!iucv_available)
774 return -ENOSYS;
775 mutex_lock(&iucv_register_mutex);
776 if (!smp)
777 iucv_nonsmp_handler++;
778 if (list_empty(&iucv_handler_list)) {
779 rc = iucv_enable();
780 if (rc)
781 goto out_mutex;
782 } else if (!smp && iucv_nonsmp_handler == 1)
783 iucv_setmask_up();
784 INIT_LIST_HEAD(&handler->paths);
785
Ursula Braun435bc9d2008-02-07 18:06:52 -0800786 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800787 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800788 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800789 rc = 0;
790out_mutex:
791 mutex_unlock(&iucv_register_mutex);
792 return rc;
793}
Heiko Carstensda99f052007-05-04 12:23:27 -0700794EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800795
796/**
797 * iucv_unregister
798 * @handler: address of iucv handler structure
799 * @smp: != 0 indicates that the handler can deal with out of order messages
800 *
801 * Unregister driver from IUCV.
802 */
803void iucv_unregister(struct iucv_handler *handler, int smp)
804{
805 struct iucv_path *p, *n;
806
807 mutex_lock(&iucv_register_mutex);
808 spin_lock_bh(&iucv_table_lock);
809 /* Remove handler from the iucv_handler_list. */
810 list_del_init(&handler->list);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300811 /* Sever all pathids still referring to the handler. */
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800812 list_for_each_entry_safe(p, n, &handler->paths, list) {
813 iucv_sever_pathid(p->pathid, NULL);
814 iucv_path_table[p->pathid] = NULL;
815 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800816 iucv_path_free(p);
817 }
818 spin_unlock_bh(&iucv_table_lock);
819 if (!smp)
820 iucv_nonsmp_handler--;
821 if (list_empty(&iucv_handler_list))
822 iucv_disable();
823 else if (!smp && iucv_nonsmp_handler == 0)
824 iucv_setmask_mp();
825 mutex_unlock(&iucv_register_mutex);
826}
Heiko Carstensda99f052007-05-04 12:23:27 -0700827EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800828
Ursula Braun6c005962009-06-16 10:30:41 +0200829static int iucv_reboot_event(struct notifier_block *this,
830 unsigned long event, void *ptr)
831{
Ursula Braun5db79c02011-05-12 18:45:07 +0000832 int i;
Ursula Braun6c005962009-06-16 10:30:41 +0200833
834 get_online_cpus();
835 on_each_cpu(iucv_block_cpu, NULL, 1);
836 preempt_disable();
837 for (i = 0; i < iucv_max_pathid; i++) {
838 if (iucv_path_table[i])
Ursula Braun5db79c02011-05-12 18:45:07 +0000839 iucv_sever_pathid(i, NULL);
Ursula Braun6c005962009-06-16 10:30:41 +0200840 }
841 preempt_enable();
842 put_online_cpus();
843 iucv_disable();
844 return NOTIFY_DONE;
845}
846
847static struct notifier_block iucv_reboot_notifier = {
848 .notifier_call = iucv_reboot_event,
849};
850
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800851/**
852 * iucv_path_accept
853 * @path: address of iucv path structure
854 * @handler: address of iucv handler structure
855 * @userdata: 16 bytes of data reflected to the communication partner
856 * @private: private data passed to interrupt handlers for this path
857 *
858 * This function is issued after the user received a connection pending
859 * external interrupt and now wishes to complete the IUCV communication path.
860 *
861 * Returns the result of the CP IUCV call.
862 */
863int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
864 u8 userdata[16], void *private)
865{
866 union iucv_param *parm;
867 int rc;
868
869 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000870 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200871 rc = -EIO;
872 goto out;
873 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800874 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100875 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800876 memset(parm, 0, sizeof(union iucv_param));
877 parm->ctrl.ippathid = path->pathid;
878 parm->ctrl.ipmsglim = path->msglim;
879 if (userdata)
880 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
881 parm->ctrl.ipflags1 = path->flags;
882
883 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
884 if (!rc) {
885 path->private = private;
886 path->msglim = parm->ctrl.ipmsglim;
887 path->flags = parm->ctrl.ipflags1;
888 }
Ursula Braun6c005962009-06-16 10:30:41 +0200889out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800890 local_bh_enable();
891 return rc;
892}
Heiko Carstensda99f052007-05-04 12:23:27 -0700893EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800894
895/**
896 * iucv_path_connect
897 * @path: address of iucv path structure
898 * @handler: address of iucv handler structure
899 * @userid: 8-byte user identification
900 * @system: 8-byte target system identification
901 * @userdata: 16 bytes of data reflected to the communication partner
902 * @private: private data passed to interrupt handlers for this path
903 *
904 * This function establishes an IUCV path. Although the connect may complete
905 * successfully, you are not able to use the path until you receive an IUCV
906 * Connection Complete external interrupt.
907 *
908 * Returns the result of the CP IUCV call.
909 */
910int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
911 u8 userid[8], u8 system[8], u8 userdata[16],
912 void *private)
913{
914 union iucv_param *parm;
915 int rc;
916
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700917 spin_lock_bh(&iucv_table_lock);
918 iucv_cleanup_queue();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000919 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200920 rc = -EIO;
921 goto out;
922 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100923 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800924 memset(parm, 0, sizeof(union iucv_param));
925 parm->ctrl.ipmsglim = path->msglim;
926 parm->ctrl.ipflags1 = path->flags;
927 if (userid) {
928 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
929 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
930 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
931 }
932 if (system) {
933 memcpy(parm->ctrl.iptarget, system,
934 sizeof(parm->ctrl.iptarget));
935 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
936 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
937 }
938 if (userdata)
939 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
940
941 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
942 if (!rc) {
943 if (parm->ctrl.ippathid < iucv_max_pathid) {
944 path->pathid = parm->ctrl.ippathid;
945 path->msglim = parm->ctrl.ipmsglim;
946 path->flags = parm->ctrl.ipflags1;
947 path->handler = handler;
948 path->private = private;
949 list_add_tail(&path->list, &handler->paths);
950 iucv_path_table[path->pathid] = path;
951 } else {
952 iucv_sever_pathid(parm->ctrl.ippathid,
953 iucv_error_pathid);
954 rc = -EIO;
955 }
956 }
Ursula Braun6c005962009-06-16 10:30:41 +0200957out:
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700958 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800959 return rc;
960}
Heiko Carstensda99f052007-05-04 12:23:27 -0700961EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800962
963/**
964 * iucv_path_quiesce:
965 * @path: address of iucv path structure
966 * @userdata: 16 bytes of data reflected to the communication partner
967 *
968 * This function temporarily suspends incoming messages on an IUCV path.
969 * You can later reactivate the path by invoking the iucv_resume function.
970 *
971 * Returns the result from the CP IUCV call.
972 */
973int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
974{
975 union iucv_param *parm;
976 int rc;
977
978 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000979 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200980 rc = -EIO;
981 goto out;
982 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100983 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800984 memset(parm, 0, sizeof(union iucv_param));
985 if (userdata)
986 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
987 parm->ctrl.ippathid = path->pathid;
988 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
Ursula Braun6c005962009-06-16 10:30:41 +0200989out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800990 local_bh_enable();
991 return rc;
992}
Heiko Carstensda99f052007-05-04 12:23:27 -0700993EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800994
995/**
996 * iucv_path_resume:
997 * @path: address of iucv path structure
998 * @userdata: 16 bytes of data reflected to the communication partner
999 *
1000 * This function resumes incoming messages on an IUCV path that has
1001 * been stopped with iucv_path_quiesce.
1002 *
1003 * Returns the result from the CP IUCV call.
1004 */
1005int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1006{
1007 union iucv_param *parm;
1008 int rc;
1009
1010 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001011 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001012 rc = -EIO;
1013 goto out;
1014 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001015 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001016 memset(parm, 0, sizeof(union iucv_param));
1017 if (userdata)
1018 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1019 parm->ctrl.ippathid = path->pathid;
1020 rc = iucv_call_b2f0(IUCV_RESUME, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001021out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001022 local_bh_enable();
1023 return rc;
1024}
1025
1026/**
1027 * iucv_path_sever
1028 * @path: address of iucv path structure
1029 * @userdata: 16 bytes of data reflected to the communication partner
1030 *
1031 * This function terminates an IUCV path.
1032 *
1033 * Returns the result from the CP IUCV call.
1034 */
1035int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1036{
1037 int rc;
1038
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001039 preempt_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001040 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001041 rc = -EIO;
1042 goto out;
1043 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001044 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001045 spin_lock_bh(&iucv_table_lock);
1046 rc = iucv_sever_pathid(path->pathid, userdata);
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001047 iucv_path_table[path->pathid] = NULL;
1048 list_del_init(&path->list);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001049 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001050 spin_unlock_bh(&iucv_table_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02001051out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001052 preempt_enable();
1053 return rc;
1054}
Heiko Carstensda99f052007-05-04 12:23:27 -07001055EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001056
1057/**
1058 * iucv_message_purge
1059 * @path: address of iucv path structure
1060 * @msg: address of iucv msg structure
1061 * @srccls: source class of message
1062 *
1063 * Cancels a message you have sent.
1064 *
1065 * Returns the result from the CP IUCV call.
1066 */
1067int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1068 u32 srccls)
1069{
1070 union iucv_param *parm;
1071 int rc;
1072
1073 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001074 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001075 rc = -EIO;
1076 goto out;
1077 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001078 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001079 memset(parm, 0, sizeof(union iucv_param));
1080 parm->purge.ippathid = path->pathid;
1081 parm->purge.ipmsgid = msg->id;
1082 parm->purge.ipsrccls = srccls;
1083 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1084 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1085 if (!rc) {
1086 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1087 msg->tag = parm->purge.ipmsgtag;
1088 }
Ursula Braun6c005962009-06-16 10:30:41 +02001089out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001090 local_bh_enable();
1091 return rc;
1092}
Heiko Carstensda99f052007-05-04 12:23:27 -07001093EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001094
1095/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001096 * iucv_message_receive_iprmdata
1097 * @path: address of iucv path structure
1098 * @msg: address of iucv msg structure
1099 * @flags: how the message is received (IUCV_IPBUFLST)
1100 * @buffer: address of data buffer or address of struct iucv_array
1101 * @size: length of data buffer
1102 * @residual:
1103 *
1104 * Internal function used by iucv_message_receive and __iucv_message_receive
1105 * to receive RMDATA data stored in struct iucv_message.
1106 */
1107static int iucv_message_receive_iprmdata(struct iucv_path *path,
1108 struct iucv_message *msg,
1109 u8 flags, void *buffer,
1110 size_t size, size_t *residual)
1111{
1112 struct iucv_array *array;
1113 u8 *rmmsg;
1114 size_t copy;
1115
1116 /*
1117 * Message is 8 bytes long and has been stored to the
1118 * message descriptor itself.
1119 */
1120 if (residual)
1121 *residual = abs(size - 8);
1122 rmmsg = msg->rmmsg;
1123 if (flags & IUCV_IPBUFLST) {
1124 /* Copy to struct iucv_array. */
1125 size = (size < 8) ? size : 8;
1126 for (array = buffer; size > 0; array++) {
1127 copy = min_t(size_t, size, array->length);
1128 memcpy((u8 *)(addr_t) array->address,
1129 rmmsg, copy);
1130 rmmsg += copy;
1131 size -= copy;
1132 }
1133 } else {
1134 /* Copy to direct buffer. */
1135 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1136 }
1137 return 0;
1138}
1139
1140/**
1141 * __iucv_message_receive
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001142 * @path: address of iucv path structure
1143 * @msg: address of iucv msg structure
1144 * @flags: how the message is received (IUCV_IPBUFLST)
1145 * @buffer: address of data buffer or address of struct iucv_array
1146 * @size: length of data buffer
1147 * @residual:
1148 *
1149 * This function receives messages that are being sent to you over
1150 * established paths. This function will deal with RMDATA messages
1151 * embedded in struct iucv_message as well.
1152 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001153 * Locking: no locking
1154 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001155 * Returns the result from the CP IUCV call.
1156 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001157int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1158 u8 flags, void *buffer, size_t size, size_t *residual)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001159{
1160 union iucv_param *parm;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001161 int rc;
1162
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001163 if (msg->flags & IUCV_IPRMDATA)
1164 return iucv_message_receive_iprmdata(path, msg, flags,
1165 buffer, size, residual);
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001166 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001167 rc = -EIO;
1168 goto out;
1169 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001170 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001171 memset(parm, 0, sizeof(union iucv_param));
1172 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1173 parm->db.ipbfln1f = (u32) size;
1174 parm->db.ipmsgid = msg->id;
1175 parm->db.ippathid = path->pathid;
1176 parm->db.iptrgcls = msg->class;
1177 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1178 IUCV_IPFGMID | IUCV_IPTRGCLS);
1179 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1180 if (!rc || rc == 5) {
1181 msg->flags = parm->db.ipflags1;
1182 if (residual)
1183 *residual = parm->db.ipbfln1f;
1184 }
Ursula Braun6c005962009-06-16 10:30:41 +02001185out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001186 return rc;
1187}
1188EXPORT_SYMBOL(__iucv_message_receive);
1189
1190/**
1191 * iucv_message_receive
1192 * @path: address of iucv path structure
1193 * @msg: address of iucv msg structure
1194 * @flags: how the message is received (IUCV_IPBUFLST)
1195 * @buffer: address of data buffer or address of struct iucv_array
1196 * @size: length of data buffer
1197 * @residual:
1198 *
1199 * This function receives messages that are being sent to you over
1200 * established paths. This function will deal with RMDATA messages
1201 * embedded in struct iucv_message as well.
1202 *
1203 * Locking: local_bh_enable/local_bh_disable
1204 *
1205 * Returns the result from the CP IUCV call.
1206 */
1207int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1208 u8 flags, void *buffer, size_t size, size_t *residual)
1209{
1210 int rc;
1211
1212 if (msg->flags & IUCV_IPRMDATA)
1213 return iucv_message_receive_iprmdata(path, msg, flags,
1214 buffer, size, residual);
1215 local_bh_disable();
1216 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001217 local_bh_enable();
1218 return rc;
1219}
Heiko Carstensda99f052007-05-04 12:23:27 -07001220EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001221
1222/**
1223 * iucv_message_reject
1224 * @path: address of iucv path structure
1225 * @msg: address of iucv msg structure
1226 *
1227 * The reject function refuses a specified message. Between the time you
1228 * are notified of a message and the time that you complete the message,
1229 * the message may be rejected.
1230 *
1231 * Returns the result from the CP IUCV call.
1232 */
1233int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1234{
1235 union iucv_param *parm;
1236 int rc;
1237
1238 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001239 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001240 rc = -EIO;
1241 goto out;
1242 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001243 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001244 memset(parm, 0, sizeof(union iucv_param));
1245 parm->db.ippathid = path->pathid;
1246 parm->db.ipmsgid = msg->id;
1247 parm->db.iptrgcls = msg->class;
1248 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1249 rc = iucv_call_b2f0(IUCV_REJECT, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001250out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001251 local_bh_enable();
1252 return rc;
1253}
Heiko Carstensda99f052007-05-04 12:23:27 -07001254EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001255
1256/**
1257 * iucv_message_reply
1258 * @path: address of iucv path structure
1259 * @msg: address of iucv msg structure
1260 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1261 * @reply: address of reply data buffer or address of struct iucv_array
1262 * @size: length of reply data buffer
1263 *
1264 * This function responds to the two-way messages that you receive. You
1265 * must identify completely the message to which you wish to reply. ie,
1266 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1267 * the parameter list.
1268 *
1269 * Returns the result from the CP IUCV call.
1270 */
1271int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1272 u8 flags, void *reply, size_t size)
1273{
1274 union iucv_param *parm;
1275 int rc;
1276
1277 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001278 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001279 rc = -EIO;
1280 goto out;
1281 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001282 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001283 memset(parm, 0, sizeof(union iucv_param));
1284 if (flags & IUCV_IPRMDATA) {
1285 parm->dpl.ippathid = path->pathid;
1286 parm->dpl.ipflags1 = flags;
1287 parm->dpl.ipmsgid = msg->id;
1288 parm->dpl.iptrgcls = msg->class;
1289 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1290 } else {
1291 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1292 parm->db.ipbfln1f = (u32) size;
1293 parm->db.ippathid = path->pathid;
1294 parm->db.ipflags1 = flags;
1295 parm->db.ipmsgid = msg->id;
1296 parm->db.iptrgcls = msg->class;
1297 }
1298 rc = iucv_call_b2f0(IUCV_REPLY, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001299out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001300 local_bh_enable();
1301 return rc;
1302}
Heiko Carstensda99f052007-05-04 12:23:27 -07001303EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001304
1305/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001306 * __iucv_message_send
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001307 * @path: address of iucv path structure
1308 * @msg: address of iucv msg structure
1309 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1310 * @srccls: source class of message
1311 * @buffer: address of send buffer or address of struct iucv_array
1312 * @size: length of send buffer
1313 *
1314 * This function transmits data to another application. Data to be
1315 * transmitted is in a buffer and this is a one-way message and the
1316 * receiver will not reply to the message.
1317 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001318 * Locking: no locking
1319 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001320 * Returns the result from the CP IUCV call.
1321 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001322int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001323 u8 flags, u32 srccls, void *buffer, size_t size)
1324{
1325 union iucv_param *parm;
1326 int rc;
1327
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001328 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001329 rc = -EIO;
1330 goto out;
1331 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001332 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001333 memset(parm, 0, sizeof(union iucv_param));
1334 if (flags & IUCV_IPRMDATA) {
1335 /* Message of 8 bytes can be placed into the parameter list. */
1336 parm->dpl.ippathid = path->pathid;
1337 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1338 parm->dpl.iptrgcls = msg->class;
1339 parm->dpl.ipsrccls = srccls;
1340 parm->dpl.ipmsgtag = msg->tag;
1341 memcpy(parm->dpl.iprmmsg, buffer, 8);
1342 } else {
1343 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1344 parm->db.ipbfln1f = (u32) size;
1345 parm->db.ippathid = path->pathid;
1346 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1347 parm->db.iptrgcls = msg->class;
1348 parm->db.ipsrccls = srccls;
1349 parm->db.ipmsgtag = msg->tag;
1350 }
1351 rc = iucv_call_b2f0(IUCV_SEND, parm);
1352 if (!rc)
1353 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001354out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001355 return rc;
1356}
1357EXPORT_SYMBOL(__iucv_message_send);
1358
1359/**
1360 * iucv_message_send
1361 * @path: address of iucv path structure
1362 * @msg: address of iucv msg structure
1363 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1364 * @srccls: source class of message
1365 * @buffer: address of send buffer or address of struct iucv_array
1366 * @size: length of send buffer
1367 *
1368 * This function transmits data to another application. Data to be
1369 * transmitted is in a buffer and this is a one-way message and the
1370 * receiver will not reply to the message.
1371 *
1372 * Locking: local_bh_enable/local_bh_disable
1373 *
1374 * Returns the result from the CP IUCV call.
1375 */
1376int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1377 u8 flags, u32 srccls, void *buffer, size_t size)
1378{
1379 int rc;
1380
1381 local_bh_disable();
1382 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001383 local_bh_enable();
1384 return rc;
1385}
Heiko Carstensda99f052007-05-04 12:23:27 -07001386EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001387
1388/**
1389 * iucv_message_send2way
1390 * @path: address of iucv path structure
1391 * @msg: address of iucv msg structure
1392 * @flags: how the message is sent and the reply is received
1393 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1394 * @srccls: source class of message
1395 * @buffer: address of send buffer or address of struct iucv_array
1396 * @size: length of send buffer
1397 * @ansbuf: address of answer buffer or address of struct iucv_array
1398 * @asize: size of reply buffer
1399 *
1400 * This function transmits data to another application. Data to be
1401 * transmitted is in a buffer. The receiver of the send is expected to
1402 * reply to the message and a buffer is provided into which IUCV moves
1403 * the reply to this message.
1404 *
1405 * Returns the result from the CP IUCV call.
1406 */
1407int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1408 u8 flags, u32 srccls, void *buffer, size_t size,
1409 void *answer, size_t asize, size_t *residual)
1410{
1411 union iucv_param *parm;
1412 int rc;
1413
1414 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001415 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001416 rc = -EIO;
1417 goto out;
1418 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001419 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001420 memset(parm, 0, sizeof(union iucv_param));
1421 if (flags & IUCV_IPRMDATA) {
1422 parm->dpl.ippathid = path->pathid;
1423 parm->dpl.ipflags1 = path->flags; /* priority message */
1424 parm->dpl.iptrgcls = msg->class;
1425 parm->dpl.ipsrccls = srccls;
1426 parm->dpl.ipmsgtag = msg->tag;
1427 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1428 parm->dpl.ipbfln2f = (u32) asize;
1429 memcpy(parm->dpl.iprmmsg, buffer, 8);
1430 } else {
1431 parm->db.ippathid = path->pathid;
1432 parm->db.ipflags1 = path->flags; /* priority message */
1433 parm->db.iptrgcls = msg->class;
1434 parm->db.ipsrccls = srccls;
1435 parm->db.ipmsgtag = msg->tag;
1436 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1437 parm->db.ipbfln1f = (u32) size;
1438 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1439 parm->db.ipbfln2f = (u32) asize;
1440 }
1441 rc = iucv_call_b2f0(IUCV_SEND, parm);
1442 if (!rc)
1443 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001444out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001445 local_bh_enable();
1446 return rc;
1447}
Heiko Carstensda99f052007-05-04 12:23:27 -07001448EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001449
1450/**
1451 * iucv_path_pending
1452 * @data: Pointer to external interrupt buffer
1453 *
1454 * Process connection pending work item. Called from tasklet while holding
1455 * iucv_table_lock.
1456 */
1457struct iucv_path_pending {
1458 u16 ippathid;
1459 u8 ipflags1;
1460 u8 iptype;
1461 u16 ipmsglim;
1462 u16 res1;
1463 u8 ipvmid[8];
1464 u8 ipuser[16];
1465 u32 res3;
1466 u8 ippollfg;
1467 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001468} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001469
1470static void iucv_path_pending(struct iucv_irq_data *data)
1471{
1472 struct iucv_path_pending *ipp = (void *) data;
1473 struct iucv_handler *handler;
1474 struct iucv_path *path;
1475 char *error;
1476
1477 BUG_ON(iucv_path_table[ipp->ippathid]);
1478 /* New pathid, handler found. Create a new path struct. */
1479 error = iucv_error_no_memory;
1480 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1481 if (!path)
1482 goto out_sever;
1483 path->pathid = ipp->ippathid;
1484 iucv_path_table[path->pathid] = path;
1485 EBCASC(ipp->ipvmid, 8);
1486
1487 /* Call registered handler until one is found that wants the path. */
1488 list_for_each_entry(handler, &iucv_handler_list, list) {
1489 if (!handler->path_pending)
1490 continue;
1491 /*
1492 * Add path to handler to allow a call to iucv_path_sever
1493 * inside the path_pending function. If the handler returns
1494 * an error remove the path from the handler again.
1495 */
1496 list_add(&path->list, &handler->paths);
1497 path->handler = handler;
1498 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1499 return;
1500 list_del(&path->list);
1501 path->handler = NULL;
1502 }
1503 /* No handler wanted the path. */
1504 iucv_path_table[path->pathid] = NULL;
1505 iucv_path_free(path);
1506 error = iucv_error_no_listener;
1507out_sever:
1508 iucv_sever_pathid(ipp->ippathid, error);
1509}
1510
1511/**
1512 * iucv_path_complete
1513 * @data: Pointer to external interrupt buffer
1514 *
1515 * Process connection complete work item. Called from tasklet while holding
1516 * iucv_table_lock.
1517 */
1518struct iucv_path_complete {
1519 u16 ippathid;
1520 u8 ipflags1;
1521 u8 iptype;
1522 u16 ipmsglim;
1523 u16 res1;
1524 u8 res2[8];
1525 u8 ipuser[16];
1526 u32 res3;
1527 u8 ippollfg;
1528 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001529} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001530
1531static void iucv_path_complete(struct iucv_irq_data *data)
1532{
1533 struct iucv_path_complete *ipc = (void *) data;
1534 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1535
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001536 if (path)
1537 path->flags = ipc->ipflags1;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001538 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001539 path->handler->path_complete(path, ipc->ipuser);
1540}
1541
1542/**
1543 * iucv_path_severed
1544 * @data: Pointer to external interrupt buffer
1545 *
1546 * Process connection severed work item. Called from tasklet while holding
1547 * iucv_table_lock.
1548 */
1549struct iucv_path_severed {
1550 u16 ippathid;
1551 u8 res1;
1552 u8 iptype;
1553 u32 res2;
1554 u8 res3[8];
1555 u8 ipuser[16];
1556 u32 res4;
1557 u8 ippollfg;
1558 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001559} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001560
1561static void iucv_path_severed(struct iucv_irq_data *data)
1562{
1563 struct iucv_path_severed *ips = (void *) data;
1564 struct iucv_path *path = iucv_path_table[ips->ippathid];
1565
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001566 if (!path || !path->handler) /* Already severed */
1567 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001568 if (path->handler->path_severed)
1569 path->handler->path_severed(path, ips->ipuser);
1570 else {
1571 iucv_sever_pathid(path->pathid, NULL);
1572 iucv_path_table[path->pathid] = NULL;
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001573 list_del(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001574 iucv_path_free(path);
1575 }
1576}
1577
1578/**
1579 * iucv_path_quiesced
1580 * @data: Pointer to external interrupt buffer
1581 *
1582 * Process connection quiesced work item. Called from tasklet while holding
1583 * iucv_table_lock.
1584 */
1585struct iucv_path_quiesced {
1586 u16 ippathid;
1587 u8 res1;
1588 u8 iptype;
1589 u32 res2;
1590 u8 res3[8];
1591 u8 ipuser[16];
1592 u32 res4;
1593 u8 ippollfg;
1594 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001595} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001596
1597static void iucv_path_quiesced(struct iucv_irq_data *data)
1598{
1599 struct iucv_path_quiesced *ipq = (void *) data;
1600 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1601
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001602 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001603 path->handler->path_quiesced(path, ipq->ipuser);
1604}
1605
1606/**
1607 * iucv_path_resumed
1608 * @data: Pointer to external interrupt buffer
1609 *
1610 * Process connection resumed work item. Called from tasklet while holding
1611 * iucv_table_lock.
1612 */
1613struct iucv_path_resumed {
1614 u16 ippathid;
1615 u8 res1;
1616 u8 iptype;
1617 u32 res2;
1618 u8 res3[8];
1619 u8 ipuser[16];
1620 u32 res4;
1621 u8 ippollfg;
1622 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001623} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001624
1625static void iucv_path_resumed(struct iucv_irq_data *data)
1626{
1627 struct iucv_path_resumed *ipr = (void *) data;
1628 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1629
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001630 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001631 path->handler->path_resumed(path, ipr->ipuser);
1632}
1633
1634/**
1635 * iucv_message_complete
1636 * @data: Pointer to external interrupt buffer
1637 *
1638 * Process message complete work item. Called from tasklet while holding
1639 * iucv_table_lock.
1640 */
1641struct iucv_message_complete {
1642 u16 ippathid;
1643 u8 ipflags1;
1644 u8 iptype;
1645 u32 ipmsgid;
1646 u32 ipaudit;
1647 u8 iprmmsg[8];
1648 u32 ipsrccls;
1649 u32 ipmsgtag;
1650 u32 res;
1651 u32 ipbfln2f;
1652 u8 ippollfg;
1653 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001654} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001655
1656static void iucv_message_complete(struct iucv_irq_data *data)
1657{
1658 struct iucv_message_complete *imc = (void *) data;
1659 struct iucv_path *path = iucv_path_table[imc->ippathid];
1660 struct iucv_message msg;
1661
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001662 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001663 msg.flags = imc->ipflags1;
1664 msg.id = imc->ipmsgid;
1665 msg.audit = imc->ipaudit;
1666 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1667 msg.class = imc->ipsrccls;
1668 msg.tag = imc->ipmsgtag;
1669 msg.length = imc->ipbfln2f;
1670 path->handler->message_complete(path, &msg);
1671 }
1672}
1673
1674/**
1675 * iucv_message_pending
1676 * @data: Pointer to external interrupt buffer
1677 *
1678 * Process message pending work item. Called from tasklet while holding
1679 * iucv_table_lock.
1680 */
1681struct iucv_message_pending {
1682 u16 ippathid;
1683 u8 ipflags1;
1684 u8 iptype;
1685 u32 ipmsgid;
1686 u32 iptrgcls;
1687 union {
1688 u32 iprmmsg1_u32;
1689 u8 iprmmsg1[4];
1690 } ln1msg1;
1691 union {
1692 u32 ipbfln1f;
1693 u8 iprmmsg2[4];
1694 } ln1msg2;
1695 u32 res1[3];
1696 u32 ipbfln2f;
1697 u8 ippollfg;
1698 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001699} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001700
1701static void iucv_message_pending(struct iucv_irq_data *data)
1702{
1703 struct iucv_message_pending *imp = (void *) data;
1704 struct iucv_path *path = iucv_path_table[imp->ippathid];
1705 struct iucv_message msg;
1706
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001707 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001708 msg.flags = imp->ipflags1;
1709 msg.id = imp->ipmsgid;
1710 msg.class = imp->iptrgcls;
1711 if (imp->ipflags1 & IUCV_IPRMDATA) {
1712 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1713 msg.length = 8;
1714 } else
1715 msg.length = imp->ln1msg2.ipbfln1f;
1716 msg.reply_size = imp->ipbfln2f;
1717 path->handler->message_pending(path, &msg);
1718 }
1719}
1720
1721/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001722 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001723 *
1724 * This tasklet loops over the queue of irq buffers created by
1725 * iucv_external_interrupt, calls the appropriate action handler
1726 * and then frees the buffer.
1727 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001728static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001729{
1730 typedef void iucv_irq_fn(struct iucv_irq_data *);
1731 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001732 [0x02] = iucv_path_complete,
1733 [0x03] = iucv_path_severed,
1734 [0x04] = iucv_path_quiesced,
1735 [0x05] = iucv_path_resumed,
1736 [0x06] = iucv_message_complete,
1737 [0x07] = iucv_message_complete,
1738 [0x08] = iucv_message_pending,
1739 [0x09] = iucv_message_pending,
1740 };
Denis Chengb5e78332007-12-07 00:51:45 -08001741 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001742 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001743
1744 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001745 if (!spin_trylock(&iucv_table_lock)) {
1746 tasklet_schedule(&iucv_tasklet);
1747 return;
1748 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001749 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001750
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001751 spin_lock_irq(&iucv_queue_lock);
1752 list_splice_init(&iucv_task_queue, &task_queue);
1753 spin_unlock_irq(&iucv_queue_lock);
1754
1755 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001756 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001757 irq_fn[p->data.iptype](&p->data);
1758 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001759 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001760
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001761 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001762 spin_unlock(&iucv_table_lock);
1763}
1764
1765/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001766 * iucv_work_fn:
1767 *
1768 * This work function loops over the queue of path pending irq blocks
1769 * created by iucv_external_interrupt, calls the appropriate action
1770 * handler and then frees the buffer.
1771 */
1772static void iucv_work_fn(struct work_struct *work)
1773{
Denis Chengb5e78332007-12-07 00:51:45 -08001774 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001775 struct iucv_irq_list *p, *n;
1776
1777 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1778 spin_lock_bh(&iucv_table_lock);
1779 iucv_active_cpu = smp_processor_id();
1780
1781 spin_lock_irq(&iucv_queue_lock);
1782 list_splice_init(&iucv_work_queue, &work_queue);
1783 spin_unlock_irq(&iucv_queue_lock);
1784
1785 iucv_cleanup_queue();
1786 list_for_each_entry_safe(p, n, &work_queue, list) {
1787 list_del_init(&p->list);
1788 iucv_path_pending(&p->data);
1789 kfree(p);
1790 }
1791
1792 iucv_active_cpu = -1;
1793 spin_unlock_bh(&iucv_table_lock);
1794}
1795
1796/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001797 * iucv_external_interrupt
1798 * @code: irq code
1799 *
1800 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001801 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001802 */
Heiko Carstensfde15c32012-03-11 11:59:31 -04001803static void iucv_external_interrupt(struct ext_code ext_code,
Martin Schwidefskyf6649a72010-10-25 16:10:38 +02001804 unsigned int param32, unsigned long param64)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001805{
1806 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001807 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001808
Heiko Carstens052ff462011-01-05 12:47:28 +01001809 kstat_cpu(smp_processor_id()).irqs[EXTINT_IUC]++;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001810 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001811 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001812 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001813 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1814 return;
1815 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001816 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001817 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001818 if (!work) {
Ursula Braun8f7c5022008-12-25 13:39:47 +01001819 pr_warning("iucv_external_interrupt: out of memory\n");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001820 return;
1821 }
1822 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001823 spin_lock(&iucv_queue_lock);
1824 if (p->iptype == 0x01) {
1825 /* Path pending interrupt. */
1826 list_add_tail(&work->list, &iucv_work_queue);
1827 schedule_work(&iucv_work);
1828 } else {
1829 /* The other interrupts. */
1830 list_add_tail(&work->list, &iucv_task_queue);
1831 tasklet_schedule(&iucv_tasklet);
1832 }
1833 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001834}
1835
Ursula Braun672e4052009-06-16 10:30:42 +02001836static int iucv_pm_prepare(struct device *dev)
1837{
1838 int rc = 0;
1839
1840#ifdef CONFIG_PM_DEBUG
1841 printk(KERN_INFO "iucv_pm_prepare\n");
1842#endif
1843 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1844 rc = dev->driver->pm->prepare(dev);
1845 return rc;
1846}
1847
1848static void iucv_pm_complete(struct device *dev)
1849{
1850#ifdef CONFIG_PM_DEBUG
1851 printk(KERN_INFO "iucv_pm_complete\n");
1852#endif
1853 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1854 dev->driver->pm->complete(dev);
1855}
1856
1857/**
1858 * iucv_path_table_empty() - determine if iucv path table is empty
1859 *
1860 * Returns 0 if there are still iucv pathes defined
1861 * 1 if there are no iucv pathes defined
1862 */
1863int iucv_path_table_empty(void)
1864{
1865 int i;
1866
1867 for (i = 0; i < iucv_max_pathid; i++) {
1868 if (iucv_path_table[i])
1869 return 0;
1870 }
1871 return 1;
1872}
1873
1874/**
1875 * iucv_pm_freeze() - Freeze PM callback
1876 * @dev: iucv-based device
1877 *
1878 * disable iucv interrupts
1879 * invoke callback function of the iucv-based driver
1880 * shut down iucv, if no iucv-pathes are established anymore
1881 */
1882static int iucv_pm_freeze(struct device *dev)
1883{
1884 int cpu;
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001885 struct iucv_irq_list *p, *n;
Ursula Braun672e4052009-06-16 10:30:42 +02001886 int rc = 0;
1887
1888#ifdef CONFIG_PM_DEBUG
1889 printk(KERN_WARNING "iucv_pm_freeze\n");
1890#endif
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001891 if (iucv_pm_state != IUCV_PM_FREEZING) {
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001892 for_each_cpu(cpu, &iucv_irq_cpumask)
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001893 smp_call_function_single(cpu, iucv_block_cpu_almost,
1894 NULL, 1);
1895 cancel_work_sync(&iucv_work);
1896 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1897 list_del_init(&p->list);
1898 iucv_sever_pathid(p->data.ippathid,
1899 iucv_error_no_listener);
1900 kfree(p);
1901 }
1902 }
Ursula Braun4c89d862009-09-16 04:37:22 +00001903 iucv_pm_state = IUCV_PM_FREEZING;
Ursula Braun672e4052009-06-16 10:30:42 +02001904 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1905 rc = dev->driver->pm->freeze(dev);
1906 if (iucv_path_table_empty())
1907 iucv_disable();
1908 return rc;
1909}
1910
1911/**
1912 * iucv_pm_thaw() - Thaw PM callback
1913 * @dev: iucv-based device
1914 *
1915 * make iucv ready for use again: allocate path table, declare interrupt buffers
1916 * and enable iucv interrupts
1917 * invoke callback function of the iucv-based driver
1918 */
1919static int iucv_pm_thaw(struct device *dev)
1920{
1921 int rc = 0;
1922
1923#ifdef CONFIG_PM_DEBUG
1924 printk(KERN_WARNING "iucv_pm_thaw\n");
1925#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001926 iucv_pm_state = IUCV_PM_THAWING;
Ursula Braun672e4052009-06-16 10:30:42 +02001927 if (!iucv_path_table) {
1928 rc = iucv_enable();
1929 if (rc)
1930 goto out;
1931 }
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001932 if (cpumask_empty(&iucv_irq_cpumask)) {
Ursula Braun672e4052009-06-16 10:30:42 +02001933 if (iucv_nonsmp_handler)
1934 /* enable interrupts on one cpu */
1935 iucv_allow_cpu(NULL);
1936 else
1937 /* enable interrupts on all cpus */
1938 iucv_setmask_mp();
1939 }
1940 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1941 rc = dev->driver->pm->thaw(dev);
1942out:
1943 return rc;
1944}
1945
1946/**
1947 * iucv_pm_restore() - Restore PM callback
1948 * @dev: iucv-based device
1949 *
1950 * make iucv ready for use again: allocate path table, declare interrupt buffers
1951 * and enable iucv interrupts
1952 * invoke callback function of the iucv-based driver
1953 */
1954static int iucv_pm_restore(struct device *dev)
1955{
1956 int rc = 0;
1957
1958#ifdef CONFIG_PM_DEBUG
1959 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1960#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001961 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1962 pr_warning("Suspending Linux did not completely close all IUCV "
1963 "connections\n");
1964 iucv_pm_state = IUCV_PM_RESTORING;
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001965 if (cpumask_empty(&iucv_irq_cpumask)) {
Ursula Braun672e4052009-06-16 10:30:42 +02001966 rc = iucv_query_maxconn();
1967 rc = iucv_enable();
1968 if (rc)
1969 goto out;
1970 }
1971 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1972 rc = dev->driver->pm->restore(dev);
1973out:
1974 return rc;
1975}
1976
Frank Blaschka96d042a2011-08-08 01:33:49 +00001977struct iucv_interface iucv_if = {
1978 .message_receive = iucv_message_receive,
1979 .__message_receive = __iucv_message_receive,
1980 .message_reply = iucv_message_reply,
1981 .message_reject = iucv_message_reject,
1982 .message_send = iucv_message_send,
1983 .__message_send = __iucv_message_send,
1984 .message_send2way = iucv_message_send2way,
1985 .message_purge = iucv_message_purge,
1986 .path_accept = iucv_path_accept,
1987 .path_connect = iucv_path_connect,
1988 .path_quiesce = iucv_path_quiesce,
1989 .path_resume = iucv_path_resume,
1990 .path_sever = iucv_path_sever,
1991 .iucv_register = iucv_register,
1992 .iucv_unregister = iucv_unregister,
1993 .bus = NULL,
1994 .root = NULL,
1995};
1996EXPORT_SYMBOL(iucv_if);
1997
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001998/**
1999 * iucv_init
2000 *
2001 * Allocates and initializes various data structures.
2002 */
Heiko Carstensda99f052007-05-04 12:23:27 -07002003static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002004{
2005 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002006 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002007
2008 if (!MACHINE_IS_VM) {
2009 rc = -EPROTONOSUPPORT;
2010 goto out;
2011 }
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002012 ctl_set_bit(0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002013 rc = iucv_query_maxconn();
2014 if (rc)
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002015 goto out_ctl;
Heiko Carstensda99f052007-05-04 12:23:27 -07002016 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002017 if (rc)
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002018 goto out_ctl;
Mark McLoughlin035da162008-12-15 12:58:29 +00002019 iucv_root = root_device_register("iucv");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002020 if (IS_ERR(iucv_root)) {
2021 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002022 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002023 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01002024
2025 for_each_online_cpu(cpu) {
2026 /* Note: GFP_DMA used to get memory below 2G */
2027 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
2028 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2029 if (!iucv_irq_data[cpu]) {
2030 rc = -ENOMEM;
2031 goto out_free;
2032 }
2033
2034 /* Allocate parameter blocks. */
2035 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
2036 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2037 if (!iucv_param[cpu]) {
2038 rc = -ENOMEM;
2039 goto out_free;
2040 }
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002041 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
2042 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2043 if (!iucv_param_irq[cpu]) {
2044 rc = -ENOMEM;
2045 goto out_free;
2046 }
2047
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002048 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002049 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
2050 if (rc)
2051 goto out_free;
Ursula Braun6c005962009-06-16 10:30:41 +02002052 rc = register_reboot_notifier(&iucv_reboot_notifier);
2053 if (rc)
2054 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002055 ASCEBC(iucv_error_no_listener, 16);
2056 ASCEBC(iucv_error_no_memory, 16);
2057 ASCEBC(iucv_error_pathid, 16);
2058 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002059 rc = bus_register(&iucv_bus);
2060 if (rc)
Ursula Braun6c005962009-06-16 10:30:41 +02002061 goto out_reboot;
Frank Blaschka96d042a2011-08-08 01:33:49 +00002062 iucv_if.root = iucv_root;
2063 iucv_if.bus = &iucv_bus;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002064 return 0;
2065
Ursula Braun6c005962009-06-16 10:30:41 +02002066out_reboot:
2067 unregister_reboot_notifier(&iucv_reboot_notifier);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002068out_cpu:
2069 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002070out_free:
2071 for_each_possible_cpu(cpu) {
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002072 kfree(iucv_param_irq[cpu]);
2073 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002074 kfree(iucv_param[cpu]);
2075 iucv_param[cpu] = NULL;
2076 kfree(iucv_irq_data[cpu]);
2077 iucv_irq_data[cpu] = NULL;
2078 }
Mark McLoughlin035da162008-12-15 12:58:29 +00002079 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002080out_int:
2081 unregister_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002082out_ctl:
2083 ctl_clear_bit(0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002084out:
2085 return rc;
2086}
2087
2088/**
2089 * iucv_exit
2090 *
2091 * Frees everything allocated from iucv_init.
2092 */
Heiko Carstensda99f052007-05-04 12:23:27 -07002093static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002094{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002095 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002096 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002097
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002098 spin_lock_irq(&iucv_queue_lock);
2099 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2100 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002101 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2102 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002103 spin_unlock_irq(&iucv_queue_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02002104 unregister_reboot_notifier(&iucv_reboot_notifier);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002105 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002106 for_each_possible_cpu(cpu) {
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002107 kfree(iucv_param_irq[cpu]);
2108 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002109 kfree(iucv_param[cpu]);
2110 iucv_param[cpu] = NULL;
2111 kfree(iucv_irq_data[cpu]);
2112 iucv_irq_data[cpu] = NULL;
2113 }
Mark McLoughlin035da162008-12-15 12:58:29 +00002114 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002115 bus_unregister(&iucv_bus);
2116 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2117}
2118
2119subsys_initcall(iucv_init);
2120module_exit(iucv_exit);
2121
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002122MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2123MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2124MODULE_LICENSE("GPL");