blob: 4fe76ff214c2aab08d703a0114ec0a86cbef6ca3 [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
Hendrik Bruecknerc0048de2013-02-06 16:12:03 +0100834 if (cpumask_empty(&iucv_irq_cpumask))
835 return NOTIFY_DONE;
836
Ursula Braun6c005962009-06-16 10:30:41 +0200837 get_online_cpus();
Hendrik Bruecknerc0048de2013-02-06 16:12:03 +0100838 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
Ursula Braun6c005962009-06-16 10:30:41 +0200839 preempt_disable();
840 for (i = 0; i < iucv_max_pathid; i++) {
841 if (iucv_path_table[i])
Ursula Braun5db79c02011-05-12 18:45:07 +0000842 iucv_sever_pathid(i, NULL);
Ursula Braun6c005962009-06-16 10:30:41 +0200843 }
844 preempt_enable();
845 put_online_cpus();
846 iucv_disable();
847 return NOTIFY_DONE;
848}
849
850static struct notifier_block iucv_reboot_notifier = {
851 .notifier_call = iucv_reboot_event,
852};
853
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800854/**
855 * iucv_path_accept
856 * @path: address of iucv path structure
857 * @handler: address of iucv handler structure
858 * @userdata: 16 bytes of data reflected to the communication partner
859 * @private: private data passed to interrupt handlers for this path
860 *
861 * This function is issued after the user received a connection pending
862 * external interrupt and now wishes to complete the IUCV communication path.
863 *
864 * Returns the result of the CP IUCV call.
865 */
866int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
867 u8 userdata[16], void *private)
868{
869 union iucv_param *parm;
870 int rc;
871
872 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000873 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200874 rc = -EIO;
875 goto out;
876 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800877 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100878 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800879 memset(parm, 0, sizeof(union iucv_param));
880 parm->ctrl.ippathid = path->pathid;
881 parm->ctrl.ipmsglim = path->msglim;
882 if (userdata)
883 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
884 parm->ctrl.ipflags1 = path->flags;
885
886 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
887 if (!rc) {
888 path->private = private;
889 path->msglim = parm->ctrl.ipmsglim;
890 path->flags = parm->ctrl.ipflags1;
891 }
Ursula Braun6c005962009-06-16 10:30:41 +0200892out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800893 local_bh_enable();
894 return rc;
895}
Heiko Carstensda99f052007-05-04 12:23:27 -0700896EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800897
898/**
899 * iucv_path_connect
900 * @path: address of iucv path structure
901 * @handler: address of iucv handler structure
902 * @userid: 8-byte user identification
903 * @system: 8-byte target system identification
904 * @userdata: 16 bytes of data reflected to the communication partner
905 * @private: private data passed to interrupt handlers for this path
906 *
907 * This function establishes an IUCV path. Although the connect may complete
908 * successfully, you are not able to use the path until you receive an IUCV
909 * Connection Complete external interrupt.
910 *
911 * Returns the result of the CP IUCV call.
912 */
913int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
914 u8 userid[8], u8 system[8], u8 userdata[16],
915 void *private)
916{
917 union iucv_param *parm;
918 int rc;
919
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700920 spin_lock_bh(&iucv_table_lock);
921 iucv_cleanup_queue();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000922 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200923 rc = -EIO;
924 goto out;
925 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100926 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800927 memset(parm, 0, sizeof(union iucv_param));
928 parm->ctrl.ipmsglim = path->msglim;
929 parm->ctrl.ipflags1 = path->flags;
930 if (userid) {
931 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
932 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
933 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
934 }
935 if (system) {
936 memcpy(parm->ctrl.iptarget, system,
937 sizeof(parm->ctrl.iptarget));
938 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
939 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
940 }
941 if (userdata)
942 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
943
944 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
945 if (!rc) {
946 if (parm->ctrl.ippathid < iucv_max_pathid) {
947 path->pathid = parm->ctrl.ippathid;
948 path->msglim = parm->ctrl.ipmsglim;
949 path->flags = parm->ctrl.ipflags1;
950 path->handler = handler;
951 path->private = private;
952 list_add_tail(&path->list, &handler->paths);
953 iucv_path_table[path->pathid] = path;
954 } else {
955 iucv_sever_pathid(parm->ctrl.ippathid,
956 iucv_error_pathid);
957 rc = -EIO;
958 }
959 }
Ursula Braun6c005962009-06-16 10:30:41 +0200960out:
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700961 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800962 return rc;
963}
Heiko Carstensda99f052007-05-04 12:23:27 -0700964EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800965
966/**
967 * iucv_path_quiesce:
968 * @path: address of iucv path structure
969 * @userdata: 16 bytes of data reflected to the communication partner
970 *
971 * This function temporarily suspends incoming messages on an IUCV path.
972 * You can later reactivate the path by invoking the iucv_resume function.
973 *
974 * Returns the result from the CP IUCV call.
975 */
976int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
977{
978 union iucv_param *parm;
979 int rc;
980
981 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000982 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200983 rc = -EIO;
984 goto out;
985 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100986 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800987 memset(parm, 0, sizeof(union iucv_param));
988 if (userdata)
989 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
990 parm->ctrl.ippathid = path->pathid;
991 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
Ursula Braun6c005962009-06-16 10:30:41 +0200992out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800993 local_bh_enable();
994 return rc;
995}
Heiko Carstensda99f052007-05-04 12:23:27 -0700996EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800997
998/**
999 * iucv_path_resume:
1000 * @path: address of iucv path structure
1001 * @userdata: 16 bytes of data reflected to the communication partner
1002 *
1003 * This function resumes incoming messages on an IUCV path that has
1004 * been stopped with iucv_path_quiesce.
1005 *
1006 * Returns the result from the CP IUCV call.
1007 */
1008int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1009{
1010 union iucv_param *parm;
1011 int rc;
1012
1013 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001014 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001015 rc = -EIO;
1016 goto out;
1017 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001018 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001019 memset(parm, 0, sizeof(union iucv_param));
1020 if (userdata)
1021 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1022 parm->ctrl.ippathid = path->pathid;
1023 rc = iucv_call_b2f0(IUCV_RESUME, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001024out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001025 local_bh_enable();
1026 return rc;
1027}
1028
1029/**
1030 * iucv_path_sever
1031 * @path: address of iucv path structure
1032 * @userdata: 16 bytes of data reflected to the communication partner
1033 *
1034 * This function terminates an IUCV path.
1035 *
1036 * Returns the result from the CP IUCV call.
1037 */
1038int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1039{
1040 int rc;
1041
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001042 preempt_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001043 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001044 rc = -EIO;
1045 goto out;
1046 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001047 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001048 spin_lock_bh(&iucv_table_lock);
1049 rc = iucv_sever_pathid(path->pathid, userdata);
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001050 iucv_path_table[path->pathid] = NULL;
1051 list_del_init(&path->list);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001052 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001053 spin_unlock_bh(&iucv_table_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02001054out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001055 preempt_enable();
1056 return rc;
1057}
Heiko Carstensda99f052007-05-04 12:23:27 -07001058EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001059
1060/**
1061 * iucv_message_purge
1062 * @path: address of iucv path structure
1063 * @msg: address of iucv msg structure
1064 * @srccls: source class of message
1065 *
1066 * Cancels a message you have sent.
1067 *
1068 * Returns the result from the CP IUCV call.
1069 */
1070int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1071 u32 srccls)
1072{
1073 union iucv_param *parm;
1074 int rc;
1075
1076 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001077 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001078 rc = -EIO;
1079 goto out;
1080 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001081 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001082 memset(parm, 0, sizeof(union iucv_param));
1083 parm->purge.ippathid = path->pathid;
1084 parm->purge.ipmsgid = msg->id;
1085 parm->purge.ipsrccls = srccls;
1086 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1087 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1088 if (!rc) {
1089 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1090 msg->tag = parm->purge.ipmsgtag;
1091 }
Ursula Braun6c005962009-06-16 10:30:41 +02001092out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001093 local_bh_enable();
1094 return rc;
1095}
Heiko Carstensda99f052007-05-04 12:23:27 -07001096EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001097
1098/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001099 * iucv_message_receive_iprmdata
1100 * @path: address of iucv path structure
1101 * @msg: address of iucv msg structure
1102 * @flags: how the message is received (IUCV_IPBUFLST)
1103 * @buffer: address of data buffer or address of struct iucv_array
1104 * @size: length of data buffer
1105 * @residual:
1106 *
1107 * Internal function used by iucv_message_receive and __iucv_message_receive
1108 * to receive RMDATA data stored in struct iucv_message.
1109 */
1110static int iucv_message_receive_iprmdata(struct iucv_path *path,
1111 struct iucv_message *msg,
1112 u8 flags, void *buffer,
1113 size_t size, size_t *residual)
1114{
1115 struct iucv_array *array;
1116 u8 *rmmsg;
1117 size_t copy;
1118
1119 /*
1120 * Message is 8 bytes long and has been stored to the
1121 * message descriptor itself.
1122 */
1123 if (residual)
1124 *residual = abs(size - 8);
1125 rmmsg = msg->rmmsg;
1126 if (flags & IUCV_IPBUFLST) {
1127 /* Copy to struct iucv_array. */
1128 size = (size < 8) ? size : 8;
1129 for (array = buffer; size > 0; array++) {
1130 copy = min_t(size_t, size, array->length);
1131 memcpy((u8 *)(addr_t) array->address,
1132 rmmsg, copy);
1133 rmmsg += copy;
1134 size -= copy;
1135 }
1136 } else {
1137 /* Copy to direct buffer. */
1138 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1139 }
1140 return 0;
1141}
1142
1143/**
1144 * __iucv_message_receive
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001145 * @path: address of iucv path structure
1146 * @msg: address of iucv msg structure
1147 * @flags: how the message is received (IUCV_IPBUFLST)
1148 * @buffer: address of data buffer or address of struct iucv_array
1149 * @size: length of data buffer
1150 * @residual:
1151 *
1152 * This function receives messages that are being sent to you over
1153 * established paths. This function will deal with RMDATA messages
1154 * embedded in struct iucv_message as well.
1155 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001156 * Locking: no locking
1157 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001158 * Returns the result from the CP IUCV call.
1159 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001160int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1161 u8 flags, void *buffer, size_t size, size_t *residual)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001162{
1163 union iucv_param *parm;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001164 int rc;
1165
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001166 if (msg->flags & IUCV_IPRMDATA)
1167 return iucv_message_receive_iprmdata(path, msg, flags,
1168 buffer, size, residual);
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001169 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001170 rc = -EIO;
1171 goto out;
1172 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001173 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001174 memset(parm, 0, sizeof(union iucv_param));
1175 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1176 parm->db.ipbfln1f = (u32) size;
1177 parm->db.ipmsgid = msg->id;
1178 parm->db.ippathid = path->pathid;
1179 parm->db.iptrgcls = msg->class;
1180 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1181 IUCV_IPFGMID | IUCV_IPTRGCLS);
1182 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1183 if (!rc || rc == 5) {
1184 msg->flags = parm->db.ipflags1;
1185 if (residual)
1186 *residual = parm->db.ipbfln1f;
1187 }
Ursula Braun6c005962009-06-16 10:30:41 +02001188out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001189 return rc;
1190}
1191EXPORT_SYMBOL(__iucv_message_receive);
1192
1193/**
1194 * iucv_message_receive
1195 * @path: address of iucv path structure
1196 * @msg: address of iucv msg structure
1197 * @flags: how the message is received (IUCV_IPBUFLST)
1198 * @buffer: address of data buffer or address of struct iucv_array
1199 * @size: length of data buffer
1200 * @residual:
1201 *
1202 * This function receives messages that are being sent to you over
1203 * established paths. This function will deal with RMDATA messages
1204 * embedded in struct iucv_message as well.
1205 *
1206 * Locking: local_bh_enable/local_bh_disable
1207 *
1208 * Returns the result from the CP IUCV call.
1209 */
1210int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1211 u8 flags, void *buffer, size_t size, size_t *residual)
1212{
1213 int rc;
1214
1215 if (msg->flags & IUCV_IPRMDATA)
1216 return iucv_message_receive_iprmdata(path, msg, flags,
1217 buffer, size, residual);
1218 local_bh_disable();
1219 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001220 local_bh_enable();
1221 return rc;
1222}
Heiko Carstensda99f052007-05-04 12:23:27 -07001223EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001224
1225/**
1226 * iucv_message_reject
1227 * @path: address of iucv path structure
1228 * @msg: address of iucv msg structure
1229 *
1230 * The reject function refuses a specified message. Between the time you
1231 * are notified of a message and the time that you complete the message,
1232 * the message may be rejected.
1233 *
1234 * Returns the result from the CP IUCV call.
1235 */
1236int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1237{
1238 union iucv_param *parm;
1239 int rc;
1240
1241 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001242 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001243 rc = -EIO;
1244 goto out;
1245 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001246 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001247 memset(parm, 0, sizeof(union iucv_param));
1248 parm->db.ippathid = path->pathid;
1249 parm->db.ipmsgid = msg->id;
1250 parm->db.iptrgcls = msg->class;
1251 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1252 rc = iucv_call_b2f0(IUCV_REJECT, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001253out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001254 local_bh_enable();
1255 return rc;
1256}
Heiko Carstensda99f052007-05-04 12:23:27 -07001257EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001258
1259/**
1260 * iucv_message_reply
1261 * @path: address of iucv path structure
1262 * @msg: address of iucv msg structure
1263 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1264 * @reply: address of reply data buffer or address of struct iucv_array
1265 * @size: length of reply data buffer
1266 *
1267 * This function responds to the two-way messages that you receive. You
1268 * must identify completely the message to which you wish to reply. ie,
1269 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1270 * the parameter list.
1271 *
1272 * Returns the result from the CP IUCV call.
1273 */
1274int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1275 u8 flags, void *reply, size_t size)
1276{
1277 union iucv_param *parm;
1278 int rc;
1279
1280 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001281 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001282 rc = -EIO;
1283 goto out;
1284 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001285 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001286 memset(parm, 0, sizeof(union iucv_param));
1287 if (flags & IUCV_IPRMDATA) {
1288 parm->dpl.ippathid = path->pathid;
1289 parm->dpl.ipflags1 = flags;
1290 parm->dpl.ipmsgid = msg->id;
1291 parm->dpl.iptrgcls = msg->class;
1292 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1293 } else {
1294 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1295 parm->db.ipbfln1f = (u32) size;
1296 parm->db.ippathid = path->pathid;
1297 parm->db.ipflags1 = flags;
1298 parm->db.ipmsgid = msg->id;
1299 parm->db.iptrgcls = msg->class;
1300 }
1301 rc = iucv_call_b2f0(IUCV_REPLY, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001302out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001303 local_bh_enable();
1304 return rc;
1305}
Heiko Carstensda99f052007-05-04 12:23:27 -07001306EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001307
1308/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001309 * __iucv_message_send
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001310 * @path: address of iucv path structure
1311 * @msg: address of iucv msg structure
1312 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1313 * @srccls: source class of message
1314 * @buffer: address of send buffer or address of struct iucv_array
1315 * @size: length of send buffer
1316 *
1317 * This function transmits data to another application. Data to be
1318 * transmitted is in a buffer and this is a one-way message and the
1319 * receiver will not reply to the message.
1320 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001321 * Locking: no locking
1322 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001323 * Returns the result from the CP IUCV call.
1324 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001325int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001326 u8 flags, u32 srccls, void *buffer, size_t size)
1327{
1328 union iucv_param *parm;
1329 int rc;
1330
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001331 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001332 rc = -EIO;
1333 goto out;
1334 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001335 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001336 memset(parm, 0, sizeof(union iucv_param));
1337 if (flags & IUCV_IPRMDATA) {
1338 /* Message of 8 bytes can be placed into the parameter list. */
1339 parm->dpl.ippathid = path->pathid;
1340 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1341 parm->dpl.iptrgcls = msg->class;
1342 parm->dpl.ipsrccls = srccls;
1343 parm->dpl.ipmsgtag = msg->tag;
1344 memcpy(parm->dpl.iprmmsg, buffer, 8);
1345 } else {
1346 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1347 parm->db.ipbfln1f = (u32) size;
1348 parm->db.ippathid = path->pathid;
1349 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1350 parm->db.iptrgcls = msg->class;
1351 parm->db.ipsrccls = srccls;
1352 parm->db.ipmsgtag = msg->tag;
1353 }
1354 rc = iucv_call_b2f0(IUCV_SEND, parm);
1355 if (!rc)
1356 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001357out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001358 return rc;
1359}
1360EXPORT_SYMBOL(__iucv_message_send);
1361
1362/**
1363 * iucv_message_send
1364 * @path: address of iucv path structure
1365 * @msg: address of iucv msg structure
1366 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1367 * @srccls: source class of message
1368 * @buffer: address of send buffer or address of struct iucv_array
1369 * @size: length of send buffer
1370 *
1371 * This function transmits data to another application. Data to be
1372 * transmitted is in a buffer and this is a one-way message and the
1373 * receiver will not reply to the message.
1374 *
1375 * Locking: local_bh_enable/local_bh_disable
1376 *
1377 * Returns the result from the CP IUCV call.
1378 */
1379int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1380 u8 flags, u32 srccls, void *buffer, size_t size)
1381{
1382 int rc;
1383
1384 local_bh_disable();
1385 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001386 local_bh_enable();
1387 return rc;
1388}
Heiko Carstensda99f052007-05-04 12:23:27 -07001389EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001390
1391/**
1392 * iucv_message_send2way
1393 * @path: address of iucv path structure
1394 * @msg: address of iucv msg structure
1395 * @flags: how the message is sent and the reply is received
1396 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1397 * @srccls: source class of message
1398 * @buffer: address of send buffer or address of struct iucv_array
1399 * @size: length of send buffer
1400 * @ansbuf: address of answer buffer or address of struct iucv_array
1401 * @asize: size of reply buffer
1402 *
1403 * This function transmits data to another application. Data to be
1404 * transmitted is in a buffer. The receiver of the send is expected to
1405 * reply to the message and a buffer is provided into which IUCV moves
1406 * the reply to this message.
1407 *
1408 * Returns the result from the CP IUCV call.
1409 */
1410int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1411 u8 flags, u32 srccls, void *buffer, size_t size,
1412 void *answer, size_t asize, size_t *residual)
1413{
1414 union iucv_param *parm;
1415 int rc;
1416
1417 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001418 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001419 rc = -EIO;
1420 goto out;
1421 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001422 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001423 memset(parm, 0, sizeof(union iucv_param));
1424 if (flags & IUCV_IPRMDATA) {
1425 parm->dpl.ippathid = path->pathid;
1426 parm->dpl.ipflags1 = path->flags; /* priority message */
1427 parm->dpl.iptrgcls = msg->class;
1428 parm->dpl.ipsrccls = srccls;
1429 parm->dpl.ipmsgtag = msg->tag;
1430 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1431 parm->dpl.ipbfln2f = (u32) asize;
1432 memcpy(parm->dpl.iprmmsg, buffer, 8);
1433 } else {
1434 parm->db.ippathid = path->pathid;
1435 parm->db.ipflags1 = path->flags; /* priority message */
1436 parm->db.iptrgcls = msg->class;
1437 parm->db.ipsrccls = srccls;
1438 parm->db.ipmsgtag = msg->tag;
1439 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1440 parm->db.ipbfln1f = (u32) size;
1441 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1442 parm->db.ipbfln2f = (u32) asize;
1443 }
1444 rc = iucv_call_b2f0(IUCV_SEND, parm);
1445 if (!rc)
1446 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001447out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001448 local_bh_enable();
1449 return rc;
1450}
Heiko Carstensda99f052007-05-04 12:23:27 -07001451EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001452
1453/**
1454 * iucv_path_pending
1455 * @data: Pointer to external interrupt buffer
1456 *
1457 * Process connection pending work item. Called from tasklet while holding
1458 * iucv_table_lock.
1459 */
1460struct iucv_path_pending {
1461 u16 ippathid;
1462 u8 ipflags1;
1463 u8 iptype;
1464 u16 ipmsglim;
1465 u16 res1;
1466 u8 ipvmid[8];
1467 u8 ipuser[16];
1468 u32 res3;
1469 u8 ippollfg;
1470 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001471} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001472
1473static void iucv_path_pending(struct iucv_irq_data *data)
1474{
1475 struct iucv_path_pending *ipp = (void *) data;
1476 struct iucv_handler *handler;
1477 struct iucv_path *path;
1478 char *error;
1479
1480 BUG_ON(iucv_path_table[ipp->ippathid]);
1481 /* New pathid, handler found. Create a new path struct. */
1482 error = iucv_error_no_memory;
1483 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1484 if (!path)
1485 goto out_sever;
1486 path->pathid = ipp->ippathid;
1487 iucv_path_table[path->pathid] = path;
1488 EBCASC(ipp->ipvmid, 8);
1489
1490 /* Call registered handler until one is found that wants the path. */
1491 list_for_each_entry(handler, &iucv_handler_list, list) {
1492 if (!handler->path_pending)
1493 continue;
1494 /*
1495 * Add path to handler to allow a call to iucv_path_sever
1496 * inside the path_pending function. If the handler returns
1497 * an error remove the path from the handler again.
1498 */
1499 list_add(&path->list, &handler->paths);
1500 path->handler = handler;
1501 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1502 return;
1503 list_del(&path->list);
1504 path->handler = NULL;
1505 }
1506 /* No handler wanted the path. */
1507 iucv_path_table[path->pathid] = NULL;
1508 iucv_path_free(path);
1509 error = iucv_error_no_listener;
1510out_sever:
1511 iucv_sever_pathid(ipp->ippathid, error);
1512}
1513
1514/**
1515 * iucv_path_complete
1516 * @data: Pointer to external interrupt buffer
1517 *
1518 * Process connection complete work item. Called from tasklet while holding
1519 * iucv_table_lock.
1520 */
1521struct iucv_path_complete {
1522 u16 ippathid;
1523 u8 ipflags1;
1524 u8 iptype;
1525 u16 ipmsglim;
1526 u16 res1;
1527 u8 res2[8];
1528 u8 ipuser[16];
1529 u32 res3;
1530 u8 ippollfg;
1531 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001532} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001533
1534static void iucv_path_complete(struct iucv_irq_data *data)
1535{
1536 struct iucv_path_complete *ipc = (void *) data;
1537 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1538
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001539 if (path)
1540 path->flags = ipc->ipflags1;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001541 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001542 path->handler->path_complete(path, ipc->ipuser);
1543}
1544
1545/**
1546 * iucv_path_severed
1547 * @data: Pointer to external interrupt buffer
1548 *
1549 * Process connection severed work item. Called from tasklet while holding
1550 * iucv_table_lock.
1551 */
1552struct iucv_path_severed {
1553 u16 ippathid;
1554 u8 res1;
1555 u8 iptype;
1556 u32 res2;
1557 u8 res3[8];
1558 u8 ipuser[16];
1559 u32 res4;
1560 u8 ippollfg;
1561 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001562} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001563
1564static void iucv_path_severed(struct iucv_irq_data *data)
1565{
1566 struct iucv_path_severed *ips = (void *) data;
1567 struct iucv_path *path = iucv_path_table[ips->ippathid];
1568
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001569 if (!path || !path->handler) /* Already severed */
1570 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001571 if (path->handler->path_severed)
1572 path->handler->path_severed(path, ips->ipuser);
1573 else {
1574 iucv_sever_pathid(path->pathid, NULL);
1575 iucv_path_table[path->pathid] = NULL;
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001576 list_del(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001577 iucv_path_free(path);
1578 }
1579}
1580
1581/**
1582 * iucv_path_quiesced
1583 * @data: Pointer to external interrupt buffer
1584 *
1585 * Process connection quiesced work item. Called from tasklet while holding
1586 * iucv_table_lock.
1587 */
1588struct iucv_path_quiesced {
1589 u16 ippathid;
1590 u8 res1;
1591 u8 iptype;
1592 u32 res2;
1593 u8 res3[8];
1594 u8 ipuser[16];
1595 u32 res4;
1596 u8 ippollfg;
1597 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001598} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001599
1600static void iucv_path_quiesced(struct iucv_irq_data *data)
1601{
1602 struct iucv_path_quiesced *ipq = (void *) data;
1603 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1604
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001605 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001606 path->handler->path_quiesced(path, ipq->ipuser);
1607}
1608
1609/**
1610 * iucv_path_resumed
1611 * @data: Pointer to external interrupt buffer
1612 *
1613 * Process connection resumed work item. Called from tasklet while holding
1614 * iucv_table_lock.
1615 */
1616struct iucv_path_resumed {
1617 u16 ippathid;
1618 u8 res1;
1619 u8 iptype;
1620 u32 res2;
1621 u8 res3[8];
1622 u8 ipuser[16];
1623 u32 res4;
1624 u8 ippollfg;
1625 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001626} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001627
1628static void iucv_path_resumed(struct iucv_irq_data *data)
1629{
1630 struct iucv_path_resumed *ipr = (void *) data;
1631 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1632
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001633 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001634 path->handler->path_resumed(path, ipr->ipuser);
1635}
1636
1637/**
1638 * iucv_message_complete
1639 * @data: Pointer to external interrupt buffer
1640 *
1641 * Process message complete work item. Called from tasklet while holding
1642 * iucv_table_lock.
1643 */
1644struct iucv_message_complete {
1645 u16 ippathid;
1646 u8 ipflags1;
1647 u8 iptype;
1648 u32 ipmsgid;
1649 u32 ipaudit;
1650 u8 iprmmsg[8];
1651 u32 ipsrccls;
1652 u32 ipmsgtag;
1653 u32 res;
1654 u32 ipbfln2f;
1655 u8 ippollfg;
1656 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001657} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001658
1659static void iucv_message_complete(struct iucv_irq_data *data)
1660{
1661 struct iucv_message_complete *imc = (void *) data;
1662 struct iucv_path *path = iucv_path_table[imc->ippathid];
1663 struct iucv_message msg;
1664
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001665 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001666 msg.flags = imc->ipflags1;
1667 msg.id = imc->ipmsgid;
1668 msg.audit = imc->ipaudit;
1669 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1670 msg.class = imc->ipsrccls;
1671 msg.tag = imc->ipmsgtag;
1672 msg.length = imc->ipbfln2f;
1673 path->handler->message_complete(path, &msg);
1674 }
1675}
1676
1677/**
1678 * iucv_message_pending
1679 * @data: Pointer to external interrupt buffer
1680 *
1681 * Process message pending work item. Called from tasklet while holding
1682 * iucv_table_lock.
1683 */
1684struct iucv_message_pending {
1685 u16 ippathid;
1686 u8 ipflags1;
1687 u8 iptype;
1688 u32 ipmsgid;
1689 u32 iptrgcls;
1690 union {
1691 u32 iprmmsg1_u32;
1692 u8 iprmmsg1[4];
1693 } ln1msg1;
1694 union {
1695 u32 ipbfln1f;
1696 u8 iprmmsg2[4];
1697 } ln1msg2;
1698 u32 res1[3];
1699 u32 ipbfln2f;
1700 u8 ippollfg;
1701 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001702} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001703
1704static void iucv_message_pending(struct iucv_irq_data *data)
1705{
1706 struct iucv_message_pending *imp = (void *) data;
1707 struct iucv_path *path = iucv_path_table[imp->ippathid];
1708 struct iucv_message msg;
1709
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001710 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001711 msg.flags = imp->ipflags1;
1712 msg.id = imp->ipmsgid;
1713 msg.class = imp->iptrgcls;
1714 if (imp->ipflags1 & IUCV_IPRMDATA) {
1715 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1716 msg.length = 8;
1717 } else
1718 msg.length = imp->ln1msg2.ipbfln1f;
1719 msg.reply_size = imp->ipbfln2f;
1720 path->handler->message_pending(path, &msg);
1721 }
1722}
1723
1724/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001725 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001726 *
1727 * This tasklet loops over the queue of irq buffers created by
1728 * iucv_external_interrupt, calls the appropriate action handler
1729 * and then frees the buffer.
1730 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001731static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001732{
1733 typedef void iucv_irq_fn(struct iucv_irq_data *);
1734 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001735 [0x02] = iucv_path_complete,
1736 [0x03] = iucv_path_severed,
1737 [0x04] = iucv_path_quiesced,
1738 [0x05] = iucv_path_resumed,
1739 [0x06] = iucv_message_complete,
1740 [0x07] = iucv_message_complete,
1741 [0x08] = iucv_message_pending,
1742 [0x09] = iucv_message_pending,
1743 };
Denis Chengb5e78332007-12-07 00:51:45 -08001744 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001745 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001746
1747 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001748 if (!spin_trylock(&iucv_table_lock)) {
1749 tasklet_schedule(&iucv_tasklet);
1750 return;
1751 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001752 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001753
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001754 spin_lock_irq(&iucv_queue_lock);
1755 list_splice_init(&iucv_task_queue, &task_queue);
1756 spin_unlock_irq(&iucv_queue_lock);
1757
1758 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001759 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001760 irq_fn[p->data.iptype](&p->data);
1761 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001762 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001763
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001764 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001765 spin_unlock(&iucv_table_lock);
1766}
1767
1768/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001769 * iucv_work_fn:
1770 *
1771 * This work function loops over the queue of path pending irq blocks
1772 * created by iucv_external_interrupt, calls the appropriate action
1773 * handler and then frees the buffer.
1774 */
1775static void iucv_work_fn(struct work_struct *work)
1776{
Denis Chengb5e78332007-12-07 00:51:45 -08001777 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001778 struct iucv_irq_list *p, *n;
1779
1780 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1781 spin_lock_bh(&iucv_table_lock);
1782 iucv_active_cpu = smp_processor_id();
1783
1784 spin_lock_irq(&iucv_queue_lock);
1785 list_splice_init(&iucv_work_queue, &work_queue);
1786 spin_unlock_irq(&iucv_queue_lock);
1787
1788 iucv_cleanup_queue();
1789 list_for_each_entry_safe(p, n, &work_queue, list) {
1790 list_del_init(&p->list);
1791 iucv_path_pending(&p->data);
1792 kfree(p);
1793 }
1794
1795 iucv_active_cpu = -1;
1796 spin_unlock_bh(&iucv_table_lock);
1797}
1798
1799/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001800 * iucv_external_interrupt
1801 * @code: irq code
1802 *
1803 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001804 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001805 */
Heiko Carstensfde15c32012-03-11 11:59:31 -04001806static void iucv_external_interrupt(struct ext_code ext_code,
Martin Schwidefskyf6649a72010-10-25 16:10:38 +02001807 unsigned int param32, unsigned long param64)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001808{
1809 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001810 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001811
Heiko Carstens420f42e2013-01-02 15:18:18 +01001812 inc_irq_stat(IRQEXT_IUC);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001813 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001814 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001815 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001816 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1817 return;
1818 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001819 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001820 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001821 if (!work) {
Ursula Braun8f7c5022008-12-25 13:39:47 +01001822 pr_warning("iucv_external_interrupt: out of memory\n");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001823 return;
1824 }
1825 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001826 spin_lock(&iucv_queue_lock);
1827 if (p->iptype == 0x01) {
1828 /* Path pending interrupt. */
1829 list_add_tail(&work->list, &iucv_work_queue);
1830 schedule_work(&iucv_work);
1831 } else {
1832 /* The other interrupts. */
1833 list_add_tail(&work->list, &iucv_task_queue);
1834 tasklet_schedule(&iucv_tasklet);
1835 }
1836 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001837}
1838
Ursula Braun672e4052009-06-16 10:30:42 +02001839static int iucv_pm_prepare(struct device *dev)
1840{
1841 int rc = 0;
1842
1843#ifdef CONFIG_PM_DEBUG
1844 printk(KERN_INFO "iucv_pm_prepare\n");
1845#endif
1846 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1847 rc = dev->driver->pm->prepare(dev);
1848 return rc;
1849}
1850
1851static void iucv_pm_complete(struct device *dev)
1852{
1853#ifdef CONFIG_PM_DEBUG
1854 printk(KERN_INFO "iucv_pm_complete\n");
1855#endif
1856 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1857 dev->driver->pm->complete(dev);
1858}
1859
1860/**
1861 * iucv_path_table_empty() - determine if iucv path table is empty
1862 *
1863 * Returns 0 if there are still iucv pathes defined
1864 * 1 if there are no iucv pathes defined
1865 */
1866int iucv_path_table_empty(void)
1867{
1868 int i;
1869
1870 for (i = 0; i < iucv_max_pathid; i++) {
1871 if (iucv_path_table[i])
1872 return 0;
1873 }
1874 return 1;
1875}
1876
1877/**
1878 * iucv_pm_freeze() - Freeze PM callback
1879 * @dev: iucv-based device
1880 *
1881 * disable iucv interrupts
1882 * invoke callback function of the iucv-based driver
1883 * shut down iucv, if no iucv-pathes are established anymore
1884 */
1885static int iucv_pm_freeze(struct device *dev)
1886{
1887 int cpu;
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001888 struct iucv_irq_list *p, *n;
Ursula Braun672e4052009-06-16 10:30:42 +02001889 int rc = 0;
1890
1891#ifdef CONFIG_PM_DEBUG
1892 printk(KERN_WARNING "iucv_pm_freeze\n");
1893#endif
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001894 if (iucv_pm_state != IUCV_PM_FREEZING) {
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001895 for_each_cpu(cpu, &iucv_irq_cpumask)
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001896 smp_call_function_single(cpu, iucv_block_cpu_almost,
1897 NULL, 1);
1898 cancel_work_sync(&iucv_work);
1899 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1900 list_del_init(&p->list);
1901 iucv_sever_pathid(p->data.ippathid,
1902 iucv_error_no_listener);
1903 kfree(p);
1904 }
1905 }
Ursula Braun4c89d862009-09-16 04:37:22 +00001906 iucv_pm_state = IUCV_PM_FREEZING;
Ursula Braun672e4052009-06-16 10:30:42 +02001907 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1908 rc = dev->driver->pm->freeze(dev);
1909 if (iucv_path_table_empty())
1910 iucv_disable();
1911 return rc;
1912}
1913
1914/**
1915 * iucv_pm_thaw() - Thaw PM callback
1916 * @dev: iucv-based device
1917 *
1918 * make iucv ready for use again: allocate path table, declare interrupt buffers
1919 * and enable iucv interrupts
1920 * invoke callback function of the iucv-based driver
1921 */
1922static int iucv_pm_thaw(struct device *dev)
1923{
1924 int rc = 0;
1925
1926#ifdef CONFIG_PM_DEBUG
1927 printk(KERN_WARNING "iucv_pm_thaw\n");
1928#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001929 iucv_pm_state = IUCV_PM_THAWING;
Ursula Braun672e4052009-06-16 10:30:42 +02001930 if (!iucv_path_table) {
1931 rc = iucv_enable();
1932 if (rc)
1933 goto out;
1934 }
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001935 if (cpumask_empty(&iucv_irq_cpumask)) {
Ursula Braun672e4052009-06-16 10:30:42 +02001936 if (iucv_nonsmp_handler)
1937 /* enable interrupts on one cpu */
1938 iucv_allow_cpu(NULL);
1939 else
1940 /* enable interrupts on all cpus */
1941 iucv_setmask_mp();
1942 }
1943 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1944 rc = dev->driver->pm->thaw(dev);
1945out:
1946 return rc;
1947}
1948
1949/**
1950 * iucv_pm_restore() - Restore PM callback
1951 * @dev: iucv-based device
1952 *
1953 * make iucv ready for use again: allocate path table, declare interrupt buffers
1954 * and enable iucv interrupts
1955 * invoke callback function of the iucv-based driver
1956 */
1957static int iucv_pm_restore(struct device *dev)
1958{
1959 int rc = 0;
1960
1961#ifdef CONFIG_PM_DEBUG
1962 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1963#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001964 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1965 pr_warning("Suspending Linux did not completely close all IUCV "
1966 "connections\n");
1967 iucv_pm_state = IUCV_PM_RESTORING;
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001968 if (cpumask_empty(&iucv_irq_cpumask)) {
Ursula Braun672e4052009-06-16 10:30:42 +02001969 rc = iucv_query_maxconn();
1970 rc = iucv_enable();
1971 if (rc)
1972 goto out;
1973 }
1974 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1975 rc = dev->driver->pm->restore(dev);
1976out:
1977 return rc;
1978}
1979
Frank Blaschka96d042a2011-08-08 01:33:49 +00001980struct iucv_interface iucv_if = {
1981 .message_receive = iucv_message_receive,
1982 .__message_receive = __iucv_message_receive,
1983 .message_reply = iucv_message_reply,
1984 .message_reject = iucv_message_reject,
1985 .message_send = iucv_message_send,
1986 .__message_send = __iucv_message_send,
1987 .message_send2way = iucv_message_send2way,
1988 .message_purge = iucv_message_purge,
1989 .path_accept = iucv_path_accept,
1990 .path_connect = iucv_path_connect,
1991 .path_quiesce = iucv_path_quiesce,
1992 .path_resume = iucv_path_resume,
1993 .path_sever = iucv_path_sever,
1994 .iucv_register = iucv_register,
1995 .iucv_unregister = iucv_unregister,
1996 .bus = NULL,
1997 .root = NULL,
1998};
1999EXPORT_SYMBOL(iucv_if);
2000
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002001/**
2002 * iucv_init
2003 *
2004 * Allocates and initializes various data structures.
2005 */
Heiko Carstensda99f052007-05-04 12:23:27 -07002006static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002007{
2008 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002009 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002010
2011 if (!MACHINE_IS_VM) {
2012 rc = -EPROTONOSUPPORT;
2013 goto out;
2014 }
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002015 ctl_set_bit(0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002016 rc = iucv_query_maxconn();
2017 if (rc)
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002018 goto out_ctl;
Heiko Carstensda99f052007-05-04 12:23:27 -07002019 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002020 if (rc)
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002021 goto out_ctl;
Mark McLoughlin035da162008-12-15 12:58:29 +00002022 iucv_root = root_device_register("iucv");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002023 if (IS_ERR(iucv_root)) {
2024 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002025 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002026 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01002027
2028 for_each_online_cpu(cpu) {
2029 /* Note: GFP_DMA used to get memory below 2G */
2030 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
2031 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2032 if (!iucv_irq_data[cpu]) {
2033 rc = -ENOMEM;
2034 goto out_free;
2035 }
2036
2037 /* Allocate parameter blocks. */
2038 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
2039 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2040 if (!iucv_param[cpu]) {
2041 rc = -ENOMEM;
2042 goto out_free;
2043 }
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002044 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
2045 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
2046 if (!iucv_param_irq[cpu]) {
2047 rc = -ENOMEM;
2048 goto out_free;
2049 }
2050
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002051 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002052 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
2053 if (rc)
2054 goto out_free;
Ursula Braun6c005962009-06-16 10:30:41 +02002055 rc = register_reboot_notifier(&iucv_reboot_notifier);
2056 if (rc)
2057 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002058 ASCEBC(iucv_error_no_listener, 16);
2059 ASCEBC(iucv_error_no_memory, 16);
2060 ASCEBC(iucv_error_pathid, 16);
2061 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002062 rc = bus_register(&iucv_bus);
2063 if (rc)
Ursula Braun6c005962009-06-16 10:30:41 +02002064 goto out_reboot;
Frank Blaschka96d042a2011-08-08 01:33:49 +00002065 iucv_if.root = iucv_root;
2066 iucv_if.bus = &iucv_bus;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002067 return 0;
2068
Ursula Braun6c005962009-06-16 10:30:41 +02002069out_reboot:
2070 unregister_reboot_notifier(&iucv_reboot_notifier);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002071out_cpu:
2072 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002073out_free:
2074 for_each_possible_cpu(cpu) {
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002075 kfree(iucv_param_irq[cpu]);
2076 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002077 kfree(iucv_param[cpu]);
2078 iucv_param[cpu] = NULL;
2079 kfree(iucv_irq_data[cpu]);
2080 iucv_irq_data[cpu] = NULL;
2081 }
Mark McLoughlin035da162008-12-15 12:58:29 +00002082 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002083out_int:
2084 unregister_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002085out_ctl:
2086 ctl_clear_bit(0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002087out:
2088 return rc;
2089}
2090
2091/**
2092 * iucv_exit
2093 *
2094 * Frees everything allocated from iucv_init.
2095 */
Heiko Carstensda99f052007-05-04 12:23:27 -07002096static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002097{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002098 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002099 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002100
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002101 spin_lock_irq(&iucv_queue_lock);
2102 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
2103 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002104 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
2105 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07002106 spin_unlock_irq(&iucv_queue_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02002107 unregister_reboot_notifier(&iucv_reboot_notifier);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002108 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002109 for_each_possible_cpu(cpu) {
Ursula Braun42e1b4c2009-04-21 23:26:20 +00002110 kfree(iucv_param_irq[cpu]);
2111 iucv_param_irq[cpu] = NULL;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002112 kfree(iucv_param[cpu]);
2113 iucv_param[cpu] = NULL;
2114 kfree(iucv_irq_data[cpu]);
2115 iucv_irq_data[cpu] = NULL;
2116 }
Mark McLoughlin035da162008-12-15 12:58:29 +00002117 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002118 bus_unregister(&iucv_bus);
2119 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2120}
2121
2122subsys_initcall(iucv_init);
2123module_exit(iucv_exit);
2124
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002125MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2126MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2127MODULE_LICENSE("GPL");