blob: 79a0ce95799fb26e7b96402afef67f4085dd10bf [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
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +0530624static void free_iucv_data(int cpu)
625{
626 kfree(iucv_param_irq[cpu]);
627 iucv_param_irq[cpu] = NULL;
628 kfree(iucv_param[cpu]);
629 iucv_param[cpu] = NULL;
630 kfree(iucv_irq_data[cpu]);
631 iucv_irq_data[cpu] = NULL;
632}
633
634static int alloc_iucv_data(int cpu)
635{
636 /* Note: GFP_DMA used to get memory below 2G */
637 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
638 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
639 if (!iucv_irq_data[cpu])
640 goto out_free;
641
642 /* Allocate parameter blocks. */
643 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
644 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
645 if (!iucv_param[cpu])
646 goto out_free;
647
648 iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
649 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
650 if (!iucv_param_irq[cpu])
651 goto out_free;
652
653 return 0;
654
655out_free:
656 free_iucv_data(cpu);
657 return -ENOMEM;
658}
659
Paul Gortmaker013dbb32013-06-19 14:32:33 -0400660static int iucv_cpu_notify(struct notifier_block *self,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800661 unsigned long action, void *hcpu)
662{
663 cpumask_t cpumask;
664 long cpu = (long) hcpu;
665
666 switch (action) {
667 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700668 case CPU_UP_PREPARE_FROZEN:
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +0530669 if (alloc_iucv_data(cpu))
Akinobu Mita92e99a92010-05-26 14:43:33 -0700670 return notifier_from_errno(-ENOMEM);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800671 break;
672 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700673 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800674 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700675 case CPU_DEAD_FROZEN:
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +0530676 free_iucv_data(cpu);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800677 break;
678 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700679 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800680 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700681 case CPU_DOWN_FAILED_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800682 if (!iucv_path_table)
683 break;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200684 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800685 break;
686 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700687 case CPU_DOWN_PREPARE_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800688 if (!iucv_path_table)
689 break;
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000690 cpumask_copy(&cpumask, &iucv_buffer_cpumask);
691 cpumask_clear_cpu(cpu, &cpumask);
692 if (cpumask_empty(&cpumask))
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800693 /* Can't offline last IUCV enabled cpu. */
Akinobu Mita92e99a92010-05-26 14:43:33 -0700694 return notifier_from_errno(-EINVAL);
Jens Axboe8691e5a2008-06-06 11:18:06 +0200695 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000696 if (cpumask_empty(&iucv_irq_cpumask))
697 smp_call_function_single(
698 cpumask_first(&iucv_buffer_cpumask),
699 iucv_allow_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800700 break;
701 }
702 return NOTIFY_OK;
703}
704
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700705static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800706 .notifier_call = iucv_cpu_notify,
707};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800708
709/**
710 * iucv_sever_pathid
711 * @pathid: path identification number.
712 * @userdata: 16-bytes of user data.
713 *
714 * Sever an iucv path to free up the pathid. Used internally.
715 */
716static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
717{
718 union iucv_param *parm;
719
Ursula Braun42e1b4c2009-04-21 23:26:20 +0000720 parm = iucv_param_irq[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800721 memset(parm, 0, sizeof(union iucv_param));
722 if (userdata)
723 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
724 parm->ctrl.ippathid = pathid;
725 return iucv_call_b2f0(IUCV_SEVER, parm);
726}
727
728/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700729 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800730 * @dummy: unused dummy argument
731 *
732 * Nop function called via smp_call_function to force work items from
733 * pending external iucv interrupts to the work queue.
734 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700735static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800736{
737}
738
739/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700740 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800741 *
742 * Function called after a path has been severed to find all remaining
743 * work items for the now stale pathid. The caller needs to hold the
744 * iucv_table_lock.
745 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700746static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800747{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700748 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800749
750 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300751 * When a path is severed, the pathid can be reused immediately
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700752 * on a iucv connect or a connection pending interrupt. Remove
753 * all entries from the task queue that refer to a stale pathid
754 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
755 * or deliver the connection pending interrupt. To get all the
756 * pending interrupts force them to the work queue by calling
757 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800758 */
Jens Axboe8691e5a2008-06-06 11:18:06 +0200759 smp_call_function(__iucv_cleanup_queue, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700760 spin_lock_irq(&iucv_queue_lock);
761 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
762 /* Remove stale work items from the task queue. */
763 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800764 list_del(&p->list);
765 kfree(p);
766 }
767 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700768 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800769}
770
771/**
772 * iucv_register:
773 * @handler: address of iucv handler structure
774 * @smp: != 0 indicates that the handler can deal with out of order messages
775 *
776 * Registers a driver with IUCV.
777 *
778 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
779 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
780 */
781int iucv_register(struct iucv_handler *handler, int smp)
782{
783 int rc;
784
785 if (!iucv_available)
786 return -ENOSYS;
787 mutex_lock(&iucv_register_mutex);
788 if (!smp)
789 iucv_nonsmp_handler++;
790 if (list_empty(&iucv_handler_list)) {
791 rc = iucv_enable();
792 if (rc)
793 goto out_mutex;
794 } else if (!smp && iucv_nonsmp_handler == 1)
795 iucv_setmask_up();
796 INIT_LIST_HEAD(&handler->paths);
797
Ursula Braun435bc9d2008-02-07 18:06:52 -0800798 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800799 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800800 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800801 rc = 0;
802out_mutex:
803 mutex_unlock(&iucv_register_mutex);
804 return rc;
805}
Heiko Carstensda99f052007-05-04 12:23:27 -0700806EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800807
808/**
809 * iucv_unregister
810 * @handler: address of iucv handler structure
811 * @smp: != 0 indicates that the handler can deal with out of order messages
812 *
813 * Unregister driver from IUCV.
814 */
815void iucv_unregister(struct iucv_handler *handler, int smp)
816{
817 struct iucv_path *p, *n;
818
819 mutex_lock(&iucv_register_mutex);
820 spin_lock_bh(&iucv_table_lock);
821 /* Remove handler from the iucv_handler_list. */
822 list_del_init(&handler->list);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300823 /* Sever all pathids still referring to the handler. */
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800824 list_for_each_entry_safe(p, n, &handler->paths, list) {
825 iucv_sever_pathid(p->pathid, NULL);
826 iucv_path_table[p->pathid] = NULL;
827 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800828 iucv_path_free(p);
829 }
830 spin_unlock_bh(&iucv_table_lock);
831 if (!smp)
832 iucv_nonsmp_handler--;
833 if (list_empty(&iucv_handler_list))
834 iucv_disable();
835 else if (!smp && iucv_nonsmp_handler == 0)
836 iucv_setmask_mp();
837 mutex_unlock(&iucv_register_mutex);
838}
Heiko Carstensda99f052007-05-04 12:23:27 -0700839EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800840
Ursula Braun6c005962009-06-16 10:30:41 +0200841static int iucv_reboot_event(struct notifier_block *this,
842 unsigned long event, void *ptr)
843{
Ursula Braun5db79c02011-05-12 18:45:07 +0000844 int i;
Ursula Braun6c005962009-06-16 10:30:41 +0200845
Hendrik Bruecknerc0048de2013-02-06 16:12:03 +0100846 if (cpumask_empty(&iucv_irq_cpumask))
847 return NOTIFY_DONE;
848
Ursula Braun6c005962009-06-16 10:30:41 +0200849 get_online_cpus();
Hendrik Bruecknerc0048de2013-02-06 16:12:03 +0100850 on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1);
Ursula Braun6c005962009-06-16 10:30:41 +0200851 preempt_disable();
852 for (i = 0; i < iucv_max_pathid; i++) {
853 if (iucv_path_table[i])
Ursula Braun5db79c02011-05-12 18:45:07 +0000854 iucv_sever_pathid(i, NULL);
Ursula Braun6c005962009-06-16 10:30:41 +0200855 }
856 preempt_enable();
857 put_online_cpus();
858 iucv_disable();
859 return NOTIFY_DONE;
860}
861
862static struct notifier_block iucv_reboot_notifier = {
863 .notifier_call = iucv_reboot_event,
864};
865
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800866/**
867 * iucv_path_accept
868 * @path: address of iucv path structure
869 * @handler: address of iucv handler structure
870 * @userdata: 16 bytes of data reflected to the communication partner
871 * @private: private data passed to interrupt handlers for this path
872 *
873 * This function is issued after the user received a connection pending
874 * external interrupt and now wishes to complete the IUCV communication path.
875 *
876 * Returns the result of the CP IUCV call.
877 */
878int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
879 u8 userdata[16], void *private)
880{
881 union iucv_param *parm;
882 int rc;
883
884 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000885 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200886 rc = -EIO;
887 goto out;
888 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800889 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100890 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800891 memset(parm, 0, sizeof(union iucv_param));
892 parm->ctrl.ippathid = path->pathid;
893 parm->ctrl.ipmsglim = path->msglim;
894 if (userdata)
895 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
896 parm->ctrl.ipflags1 = path->flags;
897
898 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
899 if (!rc) {
900 path->private = private;
901 path->msglim = parm->ctrl.ipmsglim;
902 path->flags = parm->ctrl.ipflags1;
903 }
Ursula Braun6c005962009-06-16 10:30:41 +0200904out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800905 local_bh_enable();
906 return rc;
907}
Heiko Carstensda99f052007-05-04 12:23:27 -0700908EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800909
910/**
911 * iucv_path_connect
912 * @path: address of iucv path structure
913 * @handler: address of iucv handler structure
914 * @userid: 8-byte user identification
915 * @system: 8-byte target system identification
916 * @userdata: 16 bytes of data reflected to the communication partner
917 * @private: private data passed to interrupt handlers for this path
918 *
919 * This function establishes an IUCV path. Although the connect may complete
920 * successfully, you are not able to use the path until you receive an IUCV
921 * Connection Complete external interrupt.
922 *
923 * Returns the result of the CP IUCV call.
924 */
925int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
926 u8 userid[8], u8 system[8], u8 userdata[16],
927 void *private)
928{
929 union iucv_param *parm;
930 int rc;
931
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700932 spin_lock_bh(&iucv_table_lock);
933 iucv_cleanup_queue();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000934 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200935 rc = -EIO;
936 goto out;
937 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100938 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800939 memset(parm, 0, sizeof(union iucv_param));
940 parm->ctrl.ipmsglim = path->msglim;
941 parm->ctrl.ipflags1 = path->flags;
942 if (userid) {
943 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
944 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
945 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
946 }
947 if (system) {
948 memcpy(parm->ctrl.iptarget, system,
949 sizeof(parm->ctrl.iptarget));
950 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
951 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
952 }
953 if (userdata)
954 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
955
956 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
957 if (!rc) {
958 if (parm->ctrl.ippathid < iucv_max_pathid) {
959 path->pathid = parm->ctrl.ippathid;
960 path->msglim = parm->ctrl.ipmsglim;
961 path->flags = parm->ctrl.ipflags1;
962 path->handler = handler;
963 path->private = private;
964 list_add_tail(&path->list, &handler->paths);
965 iucv_path_table[path->pathid] = path;
966 } else {
967 iucv_sever_pathid(parm->ctrl.ippathid,
968 iucv_error_pathid);
969 rc = -EIO;
970 }
971 }
Ursula Braun6c005962009-06-16 10:30:41 +0200972out:
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700973 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800974 return rc;
975}
Heiko Carstensda99f052007-05-04 12:23:27 -0700976EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800977
978/**
979 * iucv_path_quiesce:
980 * @path: address of iucv path structure
981 * @userdata: 16 bytes of data reflected to the communication partner
982 *
983 * This function temporarily suspends incoming messages on an IUCV path.
984 * You can later reactivate the path by invoking the iucv_resume function.
985 *
986 * Returns the result from the CP IUCV call.
987 */
988int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
989{
990 union iucv_param *parm;
991 int rc;
992
993 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +0000994 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +0200995 rc = -EIO;
996 goto out;
997 }
Christoph Lameter70cf50352007-11-20 11:13:38 +0100998 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800999 memset(parm, 0, sizeof(union iucv_param));
1000 if (userdata)
1001 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1002 parm->ctrl.ippathid = path->pathid;
1003 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001004out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001005 local_bh_enable();
1006 return rc;
1007}
Heiko Carstensda99f052007-05-04 12:23:27 -07001008EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001009
1010/**
1011 * iucv_path_resume:
1012 * @path: address of iucv path structure
1013 * @userdata: 16 bytes of data reflected to the communication partner
1014 *
1015 * This function resumes incoming messages on an IUCV path that has
1016 * been stopped with iucv_path_quiesce.
1017 *
1018 * Returns the result from the CP IUCV call.
1019 */
1020int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
1021{
1022 union iucv_param *parm;
1023 int rc;
1024
1025 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001026 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001027 rc = -EIO;
1028 goto out;
1029 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001030 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001031 memset(parm, 0, sizeof(union iucv_param));
1032 if (userdata)
1033 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
1034 parm->ctrl.ippathid = path->pathid;
1035 rc = iucv_call_b2f0(IUCV_RESUME, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001036out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001037 local_bh_enable();
1038 return rc;
1039}
1040
1041/**
1042 * iucv_path_sever
1043 * @path: address of iucv path structure
1044 * @userdata: 16 bytes of data reflected to the communication partner
1045 *
1046 * This function terminates an IUCV path.
1047 *
1048 * Returns the result from the CP IUCV call.
1049 */
1050int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
1051{
1052 int rc;
1053
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001054 preempt_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001055 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001056 rc = -EIO;
1057 goto out;
1058 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001059 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001060 spin_lock_bh(&iucv_table_lock);
1061 rc = iucv_sever_pathid(path->pathid, userdata);
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001062 iucv_path_table[path->pathid] = NULL;
1063 list_del_init(&path->list);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001064 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001065 spin_unlock_bh(&iucv_table_lock);
Ursula Braun6c005962009-06-16 10:30:41 +02001066out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001067 preempt_enable();
1068 return rc;
1069}
Heiko Carstensda99f052007-05-04 12:23:27 -07001070EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001071
1072/**
1073 * iucv_message_purge
1074 * @path: address of iucv path structure
1075 * @msg: address of iucv msg structure
1076 * @srccls: source class of message
1077 *
1078 * Cancels a message you have sent.
1079 *
1080 * Returns the result from the CP IUCV call.
1081 */
1082int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
1083 u32 srccls)
1084{
1085 union iucv_param *parm;
1086 int rc;
1087
1088 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001089 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001090 rc = -EIO;
1091 goto out;
1092 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001093 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001094 memset(parm, 0, sizeof(union iucv_param));
1095 parm->purge.ippathid = path->pathid;
1096 parm->purge.ipmsgid = msg->id;
1097 parm->purge.ipsrccls = srccls;
1098 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
1099 rc = iucv_call_b2f0(IUCV_PURGE, parm);
1100 if (!rc) {
1101 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
1102 msg->tag = parm->purge.ipmsgtag;
1103 }
Ursula Braun6c005962009-06-16 10:30:41 +02001104out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001105 local_bh_enable();
1106 return rc;
1107}
Heiko Carstensda99f052007-05-04 12:23:27 -07001108EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001109
1110/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001111 * iucv_message_receive_iprmdata
1112 * @path: address of iucv path structure
1113 * @msg: address of iucv msg structure
1114 * @flags: how the message is received (IUCV_IPBUFLST)
1115 * @buffer: address of data buffer or address of struct iucv_array
1116 * @size: length of data buffer
1117 * @residual:
1118 *
1119 * Internal function used by iucv_message_receive and __iucv_message_receive
1120 * to receive RMDATA data stored in struct iucv_message.
1121 */
1122static int iucv_message_receive_iprmdata(struct iucv_path *path,
1123 struct iucv_message *msg,
1124 u8 flags, void *buffer,
1125 size_t size, size_t *residual)
1126{
1127 struct iucv_array *array;
1128 u8 *rmmsg;
1129 size_t copy;
1130
1131 /*
1132 * Message is 8 bytes long and has been stored to the
1133 * message descriptor itself.
1134 */
1135 if (residual)
1136 *residual = abs(size - 8);
1137 rmmsg = msg->rmmsg;
1138 if (flags & IUCV_IPBUFLST) {
1139 /* Copy to struct iucv_array. */
1140 size = (size < 8) ? size : 8;
1141 for (array = buffer; size > 0; array++) {
1142 copy = min_t(size_t, size, array->length);
1143 memcpy((u8 *)(addr_t) array->address,
1144 rmmsg, copy);
1145 rmmsg += copy;
1146 size -= copy;
1147 }
1148 } else {
1149 /* Copy to direct buffer. */
1150 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1151 }
1152 return 0;
1153}
1154
1155/**
1156 * __iucv_message_receive
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001157 * @path: address of iucv path structure
1158 * @msg: address of iucv msg structure
1159 * @flags: how the message is received (IUCV_IPBUFLST)
1160 * @buffer: address of data buffer or address of struct iucv_array
1161 * @size: length of data buffer
1162 * @residual:
1163 *
1164 * This function receives messages that are being sent to you over
1165 * established paths. This function will deal with RMDATA messages
1166 * embedded in struct iucv_message as well.
1167 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001168 * Locking: no locking
1169 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001170 * Returns the result from the CP IUCV call.
1171 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001172int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1173 u8 flags, void *buffer, size_t size, size_t *residual)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001174{
1175 union iucv_param *parm;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001176 int rc;
1177
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001178 if (msg->flags & IUCV_IPRMDATA)
1179 return iucv_message_receive_iprmdata(path, msg, flags,
1180 buffer, size, residual);
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001181 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001182 rc = -EIO;
1183 goto out;
1184 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001185 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001186 memset(parm, 0, sizeof(union iucv_param));
1187 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1188 parm->db.ipbfln1f = (u32) size;
1189 parm->db.ipmsgid = msg->id;
1190 parm->db.ippathid = path->pathid;
1191 parm->db.iptrgcls = msg->class;
1192 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1193 IUCV_IPFGMID | IUCV_IPTRGCLS);
1194 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1195 if (!rc || rc == 5) {
1196 msg->flags = parm->db.ipflags1;
1197 if (residual)
1198 *residual = parm->db.ipbfln1f;
1199 }
Ursula Braun6c005962009-06-16 10:30:41 +02001200out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001201 return rc;
1202}
1203EXPORT_SYMBOL(__iucv_message_receive);
1204
1205/**
1206 * iucv_message_receive
1207 * @path: address of iucv path structure
1208 * @msg: address of iucv msg structure
1209 * @flags: how the message is received (IUCV_IPBUFLST)
1210 * @buffer: address of data buffer or address of struct iucv_array
1211 * @size: length of data buffer
1212 * @residual:
1213 *
1214 * This function receives messages that are being sent to you over
1215 * established paths. This function will deal with RMDATA messages
1216 * embedded in struct iucv_message as well.
1217 *
1218 * Locking: local_bh_enable/local_bh_disable
1219 *
1220 * Returns the result from the CP IUCV call.
1221 */
1222int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1223 u8 flags, void *buffer, size_t size, size_t *residual)
1224{
1225 int rc;
1226
1227 if (msg->flags & IUCV_IPRMDATA)
1228 return iucv_message_receive_iprmdata(path, msg, flags,
1229 buffer, size, residual);
1230 local_bh_disable();
1231 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001232 local_bh_enable();
1233 return rc;
1234}
Heiko Carstensda99f052007-05-04 12:23:27 -07001235EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001236
1237/**
1238 * iucv_message_reject
1239 * @path: address of iucv path structure
1240 * @msg: address of iucv msg structure
1241 *
1242 * The reject function refuses a specified message. Between the time you
1243 * are notified of a message and the time that you complete the message,
1244 * the message may be rejected.
1245 *
1246 * Returns the result from the CP IUCV call.
1247 */
1248int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1249{
1250 union iucv_param *parm;
1251 int rc;
1252
1253 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001254 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001255 rc = -EIO;
1256 goto out;
1257 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001258 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001259 memset(parm, 0, sizeof(union iucv_param));
1260 parm->db.ippathid = path->pathid;
1261 parm->db.ipmsgid = msg->id;
1262 parm->db.iptrgcls = msg->class;
1263 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1264 rc = iucv_call_b2f0(IUCV_REJECT, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001265out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001266 local_bh_enable();
1267 return rc;
1268}
Heiko Carstensda99f052007-05-04 12:23:27 -07001269EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001270
1271/**
1272 * iucv_message_reply
1273 * @path: address of iucv path structure
1274 * @msg: address of iucv msg structure
1275 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1276 * @reply: address of reply data buffer or address of struct iucv_array
1277 * @size: length of reply data buffer
1278 *
1279 * This function responds to the two-way messages that you receive. You
1280 * must identify completely the message to which you wish to reply. ie,
1281 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1282 * the parameter list.
1283 *
1284 * Returns the result from the CP IUCV call.
1285 */
1286int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1287 u8 flags, void *reply, size_t size)
1288{
1289 union iucv_param *parm;
1290 int rc;
1291
1292 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001293 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001294 rc = -EIO;
1295 goto out;
1296 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001297 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001298 memset(parm, 0, sizeof(union iucv_param));
1299 if (flags & IUCV_IPRMDATA) {
1300 parm->dpl.ippathid = path->pathid;
1301 parm->dpl.ipflags1 = flags;
1302 parm->dpl.ipmsgid = msg->id;
1303 parm->dpl.iptrgcls = msg->class;
1304 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1305 } else {
1306 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1307 parm->db.ipbfln1f = (u32) size;
1308 parm->db.ippathid = path->pathid;
1309 parm->db.ipflags1 = flags;
1310 parm->db.ipmsgid = msg->id;
1311 parm->db.iptrgcls = msg->class;
1312 }
1313 rc = iucv_call_b2f0(IUCV_REPLY, parm);
Ursula Braun6c005962009-06-16 10:30:41 +02001314out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001315 local_bh_enable();
1316 return rc;
1317}
Heiko Carstensda99f052007-05-04 12:23:27 -07001318EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001319
1320/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001321 * __iucv_message_send
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001322 * @path: address of iucv path structure
1323 * @msg: address of iucv msg structure
1324 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1325 * @srccls: source class of message
1326 * @buffer: address of send buffer or address of struct iucv_array
1327 * @size: length of send buffer
1328 *
1329 * This function transmits data to another application. Data to be
1330 * transmitted is in a buffer and this is a one-way message and the
1331 * receiver will not reply to the message.
1332 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001333 * Locking: no locking
1334 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001335 * Returns the result from the CP IUCV call.
1336 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001337int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001338 u8 flags, u32 srccls, void *buffer, size_t size)
1339{
1340 union iucv_param *parm;
1341 int rc;
1342
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001343 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001344 rc = -EIO;
1345 goto out;
1346 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001347 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001348 memset(parm, 0, sizeof(union iucv_param));
1349 if (flags & IUCV_IPRMDATA) {
1350 /* Message of 8 bytes can be placed into the parameter list. */
1351 parm->dpl.ippathid = path->pathid;
1352 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1353 parm->dpl.iptrgcls = msg->class;
1354 parm->dpl.ipsrccls = srccls;
1355 parm->dpl.ipmsgtag = msg->tag;
1356 memcpy(parm->dpl.iprmmsg, buffer, 8);
1357 } else {
1358 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1359 parm->db.ipbfln1f = (u32) size;
1360 parm->db.ippathid = path->pathid;
1361 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1362 parm->db.iptrgcls = msg->class;
1363 parm->db.ipsrccls = srccls;
1364 parm->db.ipmsgtag = msg->tag;
1365 }
1366 rc = iucv_call_b2f0(IUCV_SEND, parm);
1367 if (!rc)
1368 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001369out:
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001370 return rc;
1371}
1372EXPORT_SYMBOL(__iucv_message_send);
1373
1374/**
1375 * iucv_message_send
1376 * @path: address of iucv path structure
1377 * @msg: address of iucv msg structure
1378 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1379 * @srccls: source class of message
1380 * @buffer: address of send buffer or address of struct iucv_array
1381 * @size: length of send buffer
1382 *
1383 * This function transmits data to another application. Data to be
1384 * transmitted is in a buffer and this is a one-way message and the
1385 * receiver will not reply to the message.
1386 *
1387 * Locking: local_bh_enable/local_bh_disable
1388 *
1389 * Returns the result from the CP IUCV call.
1390 */
1391int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1392 u8 flags, u32 srccls, void *buffer, size_t size)
1393{
1394 int rc;
1395
1396 local_bh_disable();
1397 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001398 local_bh_enable();
1399 return rc;
1400}
Heiko Carstensda99f052007-05-04 12:23:27 -07001401EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001402
1403/**
1404 * iucv_message_send2way
1405 * @path: address of iucv path structure
1406 * @msg: address of iucv msg structure
1407 * @flags: how the message is sent and the reply is received
1408 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1409 * @srccls: source class of message
1410 * @buffer: address of send buffer or address of struct iucv_array
1411 * @size: length of send buffer
1412 * @ansbuf: address of answer buffer or address of struct iucv_array
1413 * @asize: size of reply buffer
1414 *
1415 * This function transmits data to another application. Data to be
1416 * transmitted is in a buffer. The receiver of the send is expected to
1417 * reply to the message and a buffer is provided into which IUCV moves
1418 * the reply to this message.
1419 *
1420 * Returns the result from the CP IUCV call.
1421 */
1422int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1423 u8 flags, u32 srccls, void *buffer, size_t size,
1424 void *answer, size_t asize, size_t *residual)
1425{
1426 union iucv_param *parm;
1427 int rc;
1428
1429 local_bh_disable();
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001430 if (cpumask_empty(&iucv_buffer_cpumask)) {
Ursula Braun6c005962009-06-16 10:30:41 +02001431 rc = -EIO;
1432 goto out;
1433 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001434 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001435 memset(parm, 0, sizeof(union iucv_param));
1436 if (flags & IUCV_IPRMDATA) {
1437 parm->dpl.ippathid = path->pathid;
1438 parm->dpl.ipflags1 = path->flags; /* priority message */
1439 parm->dpl.iptrgcls = msg->class;
1440 parm->dpl.ipsrccls = srccls;
1441 parm->dpl.ipmsgtag = msg->tag;
1442 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1443 parm->dpl.ipbfln2f = (u32) asize;
1444 memcpy(parm->dpl.iprmmsg, buffer, 8);
1445 } else {
1446 parm->db.ippathid = path->pathid;
1447 parm->db.ipflags1 = path->flags; /* priority message */
1448 parm->db.iptrgcls = msg->class;
1449 parm->db.ipsrccls = srccls;
1450 parm->db.ipmsgtag = msg->tag;
1451 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1452 parm->db.ipbfln1f = (u32) size;
1453 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1454 parm->db.ipbfln2f = (u32) asize;
1455 }
1456 rc = iucv_call_b2f0(IUCV_SEND, parm);
1457 if (!rc)
1458 msg->id = parm->db.ipmsgid;
Ursula Braun6c005962009-06-16 10:30:41 +02001459out:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001460 local_bh_enable();
1461 return rc;
1462}
Heiko Carstensda99f052007-05-04 12:23:27 -07001463EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001464
1465/**
1466 * iucv_path_pending
1467 * @data: Pointer to external interrupt buffer
1468 *
1469 * Process connection pending work item. Called from tasklet while holding
1470 * iucv_table_lock.
1471 */
1472struct iucv_path_pending {
1473 u16 ippathid;
1474 u8 ipflags1;
1475 u8 iptype;
1476 u16 ipmsglim;
1477 u16 res1;
1478 u8 ipvmid[8];
1479 u8 ipuser[16];
1480 u32 res3;
1481 u8 ippollfg;
1482 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001483} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001484
1485static void iucv_path_pending(struct iucv_irq_data *data)
1486{
1487 struct iucv_path_pending *ipp = (void *) data;
1488 struct iucv_handler *handler;
1489 struct iucv_path *path;
1490 char *error;
1491
1492 BUG_ON(iucv_path_table[ipp->ippathid]);
1493 /* New pathid, handler found. Create a new path struct. */
1494 error = iucv_error_no_memory;
1495 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1496 if (!path)
1497 goto out_sever;
1498 path->pathid = ipp->ippathid;
1499 iucv_path_table[path->pathid] = path;
1500 EBCASC(ipp->ipvmid, 8);
1501
1502 /* Call registered handler until one is found that wants the path. */
1503 list_for_each_entry(handler, &iucv_handler_list, list) {
1504 if (!handler->path_pending)
1505 continue;
1506 /*
1507 * Add path to handler to allow a call to iucv_path_sever
1508 * inside the path_pending function. If the handler returns
1509 * an error remove the path from the handler again.
1510 */
1511 list_add(&path->list, &handler->paths);
1512 path->handler = handler;
1513 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1514 return;
1515 list_del(&path->list);
1516 path->handler = NULL;
1517 }
1518 /* No handler wanted the path. */
1519 iucv_path_table[path->pathid] = NULL;
1520 iucv_path_free(path);
1521 error = iucv_error_no_listener;
1522out_sever:
1523 iucv_sever_pathid(ipp->ippathid, error);
1524}
1525
1526/**
1527 * iucv_path_complete
1528 * @data: Pointer to external interrupt buffer
1529 *
1530 * Process connection complete work item. Called from tasklet while holding
1531 * iucv_table_lock.
1532 */
1533struct iucv_path_complete {
1534 u16 ippathid;
1535 u8 ipflags1;
1536 u8 iptype;
1537 u16 ipmsglim;
1538 u16 res1;
1539 u8 res2[8];
1540 u8 ipuser[16];
1541 u32 res3;
1542 u8 ippollfg;
1543 u8 res4[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001544} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001545
1546static void iucv_path_complete(struct iucv_irq_data *data)
1547{
1548 struct iucv_path_complete *ipc = (void *) data;
1549 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1550
Hendrik Bruecknerb8942e32009-04-21 23:26:23 +00001551 if (path)
1552 path->flags = ipc->ipflags1;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001553 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001554 path->handler->path_complete(path, ipc->ipuser);
1555}
1556
1557/**
1558 * iucv_path_severed
1559 * @data: Pointer to external interrupt buffer
1560 *
1561 * Process connection severed work item. Called from tasklet while holding
1562 * iucv_table_lock.
1563 */
1564struct iucv_path_severed {
1565 u16 ippathid;
1566 u8 res1;
1567 u8 iptype;
1568 u32 res2;
1569 u8 res3[8];
1570 u8 ipuser[16];
1571 u32 res4;
1572 u8 ippollfg;
1573 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001574} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001575
1576static void iucv_path_severed(struct iucv_irq_data *data)
1577{
1578 struct iucv_path_severed *ips = (void *) data;
1579 struct iucv_path *path = iucv_path_table[ips->ippathid];
1580
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001581 if (!path || !path->handler) /* Already severed */
1582 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001583 if (path->handler->path_severed)
1584 path->handler->path_severed(path, ips->ipuser);
1585 else {
1586 iucv_sever_pathid(path->pathid, NULL);
1587 iucv_path_table[path->pathid] = NULL;
Ursula Braun42e1b4c2009-04-21 23:26:20 +00001588 list_del(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001589 iucv_path_free(path);
1590 }
1591}
1592
1593/**
1594 * iucv_path_quiesced
1595 * @data: Pointer to external interrupt buffer
1596 *
1597 * Process connection quiesced work item. Called from tasklet while holding
1598 * iucv_table_lock.
1599 */
1600struct iucv_path_quiesced {
1601 u16 ippathid;
1602 u8 res1;
1603 u8 iptype;
1604 u32 res2;
1605 u8 res3[8];
1606 u8 ipuser[16];
1607 u32 res4;
1608 u8 ippollfg;
1609 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001610} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001611
1612static void iucv_path_quiesced(struct iucv_irq_data *data)
1613{
1614 struct iucv_path_quiesced *ipq = (void *) data;
1615 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1616
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001617 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001618 path->handler->path_quiesced(path, ipq->ipuser);
1619}
1620
1621/**
1622 * iucv_path_resumed
1623 * @data: Pointer to external interrupt buffer
1624 *
1625 * Process connection resumed work item. Called from tasklet while holding
1626 * iucv_table_lock.
1627 */
1628struct iucv_path_resumed {
1629 u16 ippathid;
1630 u8 res1;
1631 u8 iptype;
1632 u32 res2;
1633 u8 res3[8];
1634 u8 ipuser[16];
1635 u32 res4;
1636 u8 ippollfg;
1637 u8 res5[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001638} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001639
1640static void iucv_path_resumed(struct iucv_irq_data *data)
1641{
1642 struct iucv_path_resumed *ipr = (void *) data;
1643 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1644
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001645 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001646 path->handler->path_resumed(path, ipr->ipuser);
1647}
1648
1649/**
1650 * iucv_message_complete
1651 * @data: Pointer to external interrupt buffer
1652 *
1653 * Process message complete work item. Called from tasklet while holding
1654 * iucv_table_lock.
1655 */
1656struct iucv_message_complete {
1657 u16 ippathid;
1658 u8 ipflags1;
1659 u8 iptype;
1660 u32 ipmsgid;
1661 u32 ipaudit;
1662 u8 iprmmsg[8];
1663 u32 ipsrccls;
1664 u32 ipmsgtag;
1665 u32 res;
1666 u32 ipbfln2f;
1667 u8 ippollfg;
1668 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001669} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001670
1671static void iucv_message_complete(struct iucv_irq_data *data)
1672{
1673 struct iucv_message_complete *imc = (void *) data;
1674 struct iucv_path *path = iucv_path_table[imc->ippathid];
1675 struct iucv_message msg;
1676
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001677 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001678 msg.flags = imc->ipflags1;
1679 msg.id = imc->ipmsgid;
1680 msg.audit = imc->ipaudit;
1681 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1682 msg.class = imc->ipsrccls;
1683 msg.tag = imc->ipmsgtag;
1684 msg.length = imc->ipbfln2f;
1685 path->handler->message_complete(path, &msg);
1686 }
1687}
1688
1689/**
1690 * iucv_message_pending
1691 * @data: Pointer to external interrupt buffer
1692 *
1693 * Process message pending work item. Called from tasklet while holding
1694 * iucv_table_lock.
1695 */
1696struct iucv_message_pending {
1697 u16 ippathid;
1698 u8 ipflags1;
1699 u8 iptype;
1700 u32 ipmsgid;
1701 u32 iptrgcls;
1702 union {
1703 u32 iprmmsg1_u32;
1704 u8 iprmmsg1[4];
1705 } ln1msg1;
1706 union {
1707 u32 ipbfln1f;
1708 u8 iprmmsg2[4];
1709 } ln1msg2;
1710 u32 res1[3];
1711 u32 ipbfln2f;
1712 u8 ippollfg;
1713 u8 res2[3];
Eric Dumazetbc105022010-06-03 03:21:52 -07001714} __packed;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001715
1716static void iucv_message_pending(struct iucv_irq_data *data)
1717{
1718 struct iucv_message_pending *imp = (void *) data;
1719 struct iucv_path *path = iucv_path_table[imp->ippathid];
1720 struct iucv_message msg;
1721
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001722 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001723 msg.flags = imp->ipflags1;
1724 msg.id = imp->ipmsgid;
1725 msg.class = imp->iptrgcls;
1726 if (imp->ipflags1 & IUCV_IPRMDATA) {
1727 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1728 msg.length = 8;
1729 } else
1730 msg.length = imp->ln1msg2.ipbfln1f;
1731 msg.reply_size = imp->ipbfln2f;
1732 path->handler->message_pending(path, &msg);
1733 }
1734}
1735
1736/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001737 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001738 *
1739 * This tasklet loops over the queue of irq buffers created by
1740 * iucv_external_interrupt, calls the appropriate action handler
1741 * and then frees the buffer.
1742 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001743static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001744{
1745 typedef void iucv_irq_fn(struct iucv_irq_data *);
1746 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001747 [0x02] = iucv_path_complete,
1748 [0x03] = iucv_path_severed,
1749 [0x04] = iucv_path_quiesced,
1750 [0x05] = iucv_path_resumed,
1751 [0x06] = iucv_message_complete,
1752 [0x07] = iucv_message_complete,
1753 [0x08] = iucv_message_pending,
1754 [0x09] = iucv_message_pending,
1755 };
Denis Chengb5e78332007-12-07 00:51:45 -08001756 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001757 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001758
1759 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001760 if (!spin_trylock(&iucv_table_lock)) {
1761 tasklet_schedule(&iucv_tasklet);
1762 return;
1763 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001764 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001765
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001766 spin_lock_irq(&iucv_queue_lock);
1767 list_splice_init(&iucv_task_queue, &task_queue);
1768 spin_unlock_irq(&iucv_queue_lock);
1769
1770 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001771 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001772 irq_fn[p->data.iptype](&p->data);
1773 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001774 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001775
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001776 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001777 spin_unlock(&iucv_table_lock);
1778}
1779
1780/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001781 * iucv_work_fn:
1782 *
1783 * This work function loops over the queue of path pending irq blocks
1784 * created by iucv_external_interrupt, calls the appropriate action
1785 * handler and then frees the buffer.
1786 */
1787static void iucv_work_fn(struct work_struct *work)
1788{
Denis Chengb5e78332007-12-07 00:51:45 -08001789 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001790 struct iucv_irq_list *p, *n;
1791
1792 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1793 spin_lock_bh(&iucv_table_lock);
1794 iucv_active_cpu = smp_processor_id();
1795
1796 spin_lock_irq(&iucv_queue_lock);
1797 list_splice_init(&iucv_work_queue, &work_queue);
1798 spin_unlock_irq(&iucv_queue_lock);
1799
1800 iucv_cleanup_queue();
1801 list_for_each_entry_safe(p, n, &work_queue, list) {
1802 list_del_init(&p->list);
1803 iucv_path_pending(&p->data);
1804 kfree(p);
1805 }
1806
1807 iucv_active_cpu = -1;
1808 spin_unlock_bh(&iucv_table_lock);
1809}
1810
1811/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001812 * iucv_external_interrupt
1813 * @code: irq code
1814 *
1815 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001816 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001817 */
Heiko Carstensfde15c32012-03-11 11:59:31 -04001818static void iucv_external_interrupt(struct ext_code ext_code,
Martin Schwidefskyf6649a72010-10-25 16:10:38 +02001819 unsigned int param32, unsigned long param64)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001820{
1821 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001822 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001823
Heiko Carstens420f42e2013-01-02 15:18:18 +01001824 inc_irq_stat(IRQEXT_IUC);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001825 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001826 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001827 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001828 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1829 return;
1830 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001831 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001832 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001833 if (!work) {
Ursula Braun8f7c5022008-12-25 13:39:47 +01001834 pr_warning("iucv_external_interrupt: out of memory\n");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001835 return;
1836 }
1837 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001838 spin_lock(&iucv_queue_lock);
1839 if (p->iptype == 0x01) {
1840 /* Path pending interrupt. */
1841 list_add_tail(&work->list, &iucv_work_queue);
1842 schedule_work(&iucv_work);
1843 } else {
1844 /* The other interrupts. */
1845 list_add_tail(&work->list, &iucv_task_queue);
1846 tasklet_schedule(&iucv_tasklet);
1847 }
1848 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001849}
1850
Ursula Braun672e4052009-06-16 10:30:42 +02001851static int iucv_pm_prepare(struct device *dev)
1852{
1853 int rc = 0;
1854
1855#ifdef CONFIG_PM_DEBUG
1856 printk(KERN_INFO "iucv_pm_prepare\n");
1857#endif
1858 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1859 rc = dev->driver->pm->prepare(dev);
1860 return rc;
1861}
1862
1863static void iucv_pm_complete(struct device *dev)
1864{
1865#ifdef CONFIG_PM_DEBUG
1866 printk(KERN_INFO "iucv_pm_complete\n");
1867#endif
1868 if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1869 dev->driver->pm->complete(dev);
1870}
1871
1872/**
1873 * iucv_path_table_empty() - determine if iucv path table is empty
1874 *
1875 * Returns 0 if there are still iucv pathes defined
1876 * 1 if there are no iucv pathes defined
1877 */
1878int iucv_path_table_empty(void)
1879{
1880 int i;
1881
1882 for (i = 0; i < iucv_max_pathid; i++) {
1883 if (iucv_path_table[i])
1884 return 0;
1885 }
1886 return 1;
1887}
1888
1889/**
1890 * iucv_pm_freeze() - Freeze PM callback
1891 * @dev: iucv-based device
1892 *
1893 * disable iucv interrupts
1894 * invoke callback function of the iucv-based driver
1895 * shut down iucv, if no iucv-pathes are established anymore
1896 */
1897static int iucv_pm_freeze(struct device *dev)
1898{
1899 int cpu;
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001900 struct iucv_irq_list *p, *n;
Ursula Braun672e4052009-06-16 10:30:42 +02001901 int rc = 0;
1902
1903#ifdef CONFIG_PM_DEBUG
1904 printk(KERN_WARNING "iucv_pm_freeze\n");
1905#endif
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001906 if (iucv_pm_state != IUCV_PM_FREEZING) {
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001907 for_each_cpu(cpu, &iucv_irq_cpumask)
Ursula Braunb7c2aec2009-11-12 21:46:27 +00001908 smp_call_function_single(cpu, iucv_block_cpu_almost,
1909 NULL, 1);
1910 cancel_work_sync(&iucv_work);
1911 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1912 list_del_init(&p->list);
1913 iucv_sever_pathid(p->data.ippathid,
1914 iucv_error_no_listener);
1915 kfree(p);
1916 }
1917 }
Ursula Braun4c89d862009-09-16 04:37:22 +00001918 iucv_pm_state = IUCV_PM_FREEZING;
Ursula Braun672e4052009-06-16 10:30:42 +02001919 if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1920 rc = dev->driver->pm->freeze(dev);
1921 if (iucv_path_table_empty())
1922 iucv_disable();
1923 return rc;
1924}
1925
1926/**
1927 * iucv_pm_thaw() - Thaw PM callback
1928 * @dev: iucv-based device
1929 *
1930 * make iucv ready for use again: allocate path table, declare interrupt buffers
1931 * and enable iucv interrupts
1932 * invoke callback function of the iucv-based driver
1933 */
1934static int iucv_pm_thaw(struct device *dev)
1935{
1936 int rc = 0;
1937
1938#ifdef CONFIG_PM_DEBUG
1939 printk(KERN_WARNING "iucv_pm_thaw\n");
1940#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001941 iucv_pm_state = IUCV_PM_THAWING;
Ursula Braun672e4052009-06-16 10:30:42 +02001942 if (!iucv_path_table) {
1943 rc = iucv_enable();
1944 if (rc)
1945 goto out;
1946 }
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001947 if (cpumask_empty(&iucv_irq_cpumask)) {
Ursula Braun672e4052009-06-16 10:30:42 +02001948 if (iucv_nonsmp_handler)
1949 /* enable interrupts on one cpu */
1950 iucv_allow_cpu(NULL);
1951 else
1952 /* enable interrupts on all cpus */
1953 iucv_setmask_mp();
1954 }
1955 if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1956 rc = dev->driver->pm->thaw(dev);
1957out:
1958 return rc;
1959}
1960
1961/**
1962 * iucv_pm_restore() - Restore PM callback
1963 * @dev: iucv-based device
1964 *
1965 * make iucv ready for use again: allocate path table, declare interrupt buffers
1966 * and enable iucv interrupts
1967 * invoke callback function of the iucv-based driver
1968 */
1969static int iucv_pm_restore(struct device *dev)
1970{
1971 int rc = 0;
1972
1973#ifdef CONFIG_PM_DEBUG
1974 printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1975#endif
Ursula Braun4c89d862009-09-16 04:37:22 +00001976 if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1977 pr_warning("Suspending Linux did not completely close all IUCV "
1978 "connections\n");
1979 iucv_pm_state = IUCV_PM_RESTORING;
KOSAKI Motohirof2019032011-05-12 18:45:09 +00001980 if (cpumask_empty(&iucv_irq_cpumask)) {
Ursula Braun672e4052009-06-16 10:30:42 +02001981 rc = iucv_query_maxconn();
1982 rc = iucv_enable();
1983 if (rc)
1984 goto out;
1985 }
1986 if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1987 rc = dev->driver->pm->restore(dev);
1988out:
1989 return rc;
1990}
1991
Frank Blaschka96d042a2011-08-08 01:33:49 +00001992struct iucv_interface iucv_if = {
1993 .message_receive = iucv_message_receive,
1994 .__message_receive = __iucv_message_receive,
1995 .message_reply = iucv_message_reply,
1996 .message_reject = iucv_message_reject,
1997 .message_send = iucv_message_send,
1998 .__message_send = __iucv_message_send,
1999 .message_send2way = iucv_message_send2way,
2000 .message_purge = iucv_message_purge,
2001 .path_accept = iucv_path_accept,
2002 .path_connect = iucv_path_connect,
2003 .path_quiesce = iucv_path_quiesce,
2004 .path_resume = iucv_path_resume,
2005 .path_sever = iucv_path_sever,
2006 .iucv_register = iucv_register,
2007 .iucv_unregister = iucv_unregister,
2008 .bus = NULL,
2009 .root = NULL,
2010};
2011EXPORT_SYMBOL(iucv_if);
2012
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002013/**
2014 * iucv_init
2015 *
2016 * Allocates and initializes various data structures.
2017 */
Heiko Carstensda99f052007-05-04 12:23:27 -07002018static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002019{
2020 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01002021 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002022
2023 if (!MACHINE_IS_VM) {
2024 rc = -EPROTONOSUPPORT;
2025 goto out;
2026 }
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002027 ctl_set_bit(0, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002028 rc = iucv_query_maxconn();
2029 if (rc)
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002030 goto out_ctl;
Heiko Carstensda99f052007-05-04 12:23:27 -07002031 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002032 if (rc)
Martin Schwidefsky5beab992011-07-24 10:48:28 +02002033 goto out_ctl;
Mark McLoughlin035da162008-12-15 12:58:29 +00002034 iucv_root = root_device_register("iucv");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002035 if (IS_ERR(iucv_root)) {
2036 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002037 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002038 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01002039
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302040 cpu_notifier_register_begin();
2041
Christoph Lameter70cf50352007-11-20 11:13:38 +01002042 for_each_online_cpu(cpu) {
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302043 if (alloc_iucv_data(cpu)) {
Christoph Lameter70cf50352007-11-20 11:13:38 +01002044 rc = -ENOMEM;
2045 goto out_free;
2046 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002047 }
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302048 rc = __register_hotcpu_notifier(&iucv_cpu_notifier);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002049 if (rc)
2050 goto out_free;
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302051
2052 cpu_notifier_register_done();
2053
Ursula Braun6c005962009-06-16 10:30:41 +02002054 rc = register_reboot_notifier(&iucv_reboot_notifier);
2055 if (rc)
2056 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002057 ASCEBC(iucv_error_no_listener, 16);
2058 ASCEBC(iucv_error_no_memory, 16);
2059 ASCEBC(iucv_error_pathid, 16);
2060 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002061 rc = bus_register(&iucv_bus);
2062 if (rc)
Ursula Braun6c005962009-06-16 10:30:41 +02002063 goto out_reboot;
Frank Blaschka96d042a2011-08-08 01:33:49 +00002064 iucv_if.root = iucv_root;
2065 iucv_if.bus = &iucv_bus;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002066 return 0;
2067
Ursula Braun6c005962009-06-16 10:30:41 +02002068out_reboot:
2069 unregister_reboot_notifier(&iucv_reboot_notifier);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07002070out_cpu:
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302071 cpu_notifier_register_begin();
2072 __unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01002073out_free:
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302074 for_each_possible_cpu(cpu)
2075 free_iucv_data(cpu);
2076
2077 cpu_notifier_register_done();
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);
Srivatsa S. Bhata0e247a2014-03-11 02:12:57 +05302105 cpu_notifier_register_begin();
2106 __unregister_hotcpu_notifier(&iucv_cpu_notifier);
2107 for_each_possible_cpu(cpu)
2108 free_iucv_data(cpu);
2109 cpu_notifier_register_done();
Mark McLoughlin035da162008-12-15 12:58:29 +00002110 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002111 bus_unregister(&iucv_bus);
2112 unregister_external_interrupt(0x4000, iucv_external_interrupt);
2113}
2114
2115subsys_initcall(iucv_init);
2116module_exit(iucv_exit);
2117
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08002118MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
2119MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
2120MODULE_LICENSE("GPL");