blob: 8f57d4f4328a88265792a881f99dfd92ca077f15 [file] [log] [blame]
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001/*
2 * IUCV base infrastructure.
3 *
4 * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s):
6 * Original source:
7 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
8 * Xenia Tkatschow (xenia@us.ibm.com)
9 * 2Gb awareness and general cleanup:
10 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
11 * Rewritten for af_iucv:
12 * Martin Schwidefsky <schwidefsky@de.ibm.com>
13 *
14 * Documentation used:
15 * The original source
16 * CP Programming Service, IBM document # SC24-5760
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2, or (at your option)
21 * any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
Ursula Braun8f7c5022008-12-25 13:39:47 +010033#define KMSG_COMPONENT "iucv"
34#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
35
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080036#include <linux/module.h>
37#include <linux/moduleparam.h>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080038#include <linux/spinlock.h>
39#include <linux/kernel.h>
40#include <linux/slab.h>
41#include <linux/init.h>
42#include <linux/interrupt.h>
43#include <linux/list.h>
44#include <linux/errno.h>
45#include <linux/err.h>
46#include <linux/device.h>
47#include <linux/cpu.h>
48#include <net/iucv/iucv.h>
49#include <asm/atomic.h>
50#include <asm/ebcdic.h>
51#include <asm/io.h>
52#include <asm/s390_ext.h>
53#include <asm/s390_rdev.h>
54#include <asm/smp.h>
55
56/*
57 * FLAGS:
58 * All flags are defined in the field IPFLAGS1 of each function
59 * and can be found in CP Programming Services.
60 * IPSRCCLS - Indicates you have specified a source class.
61 * IPTRGCLS - Indicates you have specified a target class.
62 * IPFGPID - Indicates you have specified a pathid.
63 * IPFGMID - Indicates you have specified a message ID.
64 * IPNORPY - Indicates a one-way message. No reply expected.
65 * IPALL - Indicates that all paths are affected.
66 */
67#define IUCV_IPSRCCLS 0x01
68#define IUCV_IPTRGCLS 0x01
69#define IUCV_IPFGPID 0x02
70#define IUCV_IPFGMID 0x04
71#define IUCV_IPNORPY 0x10
72#define IUCV_IPALL 0x80
73
Heiko Carstensda99f052007-05-04 12:23:27 -070074static int iucv_bus_match(struct device *dev, struct device_driver *drv)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080075{
76 return 0;
77}
78
79struct bus_type iucv_bus = {
80 .name = "iucv",
81 .match = iucv_bus_match,
82};
Heiko Carstensda99f052007-05-04 12:23:27 -070083EXPORT_SYMBOL(iucv_bus);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080084
85struct device *iucv_root;
Heiko Carstensda99f052007-05-04 12:23:27 -070086EXPORT_SYMBOL(iucv_root);
87
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080088static int iucv_available;
89
90/* General IUCV interrupt structure */
91struct iucv_irq_data {
92 u16 ippathid;
93 u8 ipflags1;
94 u8 iptype;
95 u32 res2[8];
96};
97
Martin Schwidefsky04b090d2007-04-28 23:03:59 -070098struct iucv_irq_list {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080099 struct list_head list;
100 struct iucv_irq_data data;
101};
102
Christoph Lameter70cf50352007-11-20 11:13:38 +0100103static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800104static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
105static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
106
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700107/*
108 * Queue of interrupt buffers lock for delivery via the tasklet
109 * (fast but can't call smp_call_function).
110 */
111static LIST_HEAD(iucv_task_queue);
112
113/*
114 * The tasklet for fast delivery of iucv interrupts.
115 */
116static void iucv_tasklet_fn(unsigned long);
117static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
118
119/*
120 * Queue of interrupt buffers for delivery via a work queue
121 * (slower but can call smp_call_function).
122 */
123static LIST_HEAD(iucv_work_queue);
124
125/*
126 * The work element to deliver path pending interrupts.
127 */
128static void iucv_work_fn(struct work_struct *work);
129static DECLARE_WORK(iucv_work, iucv_work_fn);
130
131/*
132 * Spinlock protecting task and work queue.
133 */
134static DEFINE_SPINLOCK(iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800135
136enum iucv_command_codes {
137 IUCV_QUERY = 0,
138 IUCV_RETRIEVE_BUFFER = 2,
139 IUCV_SEND = 4,
140 IUCV_RECEIVE = 5,
141 IUCV_REPLY = 6,
142 IUCV_REJECT = 8,
143 IUCV_PURGE = 9,
144 IUCV_ACCEPT = 10,
145 IUCV_CONNECT = 11,
146 IUCV_DECLARE_BUFFER = 12,
147 IUCV_QUIESCE = 13,
148 IUCV_RESUME = 14,
149 IUCV_SEVER = 15,
150 IUCV_SETMASK = 16,
151};
152
153/*
154 * Error messages that are used with the iucv_sever function. They get
155 * converted to EBCDIC.
156 */
157static char iucv_error_no_listener[16] = "NO LISTENER";
158static char iucv_error_no_memory[16] = "NO MEMORY";
159static char iucv_error_pathid[16] = "INVALID PATHID";
160
161/*
162 * iucv_handler_list: List of registered handlers.
163 */
164static LIST_HEAD(iucv_handler_list);
165
166/*
167 * iucv_path_table: an array of iucv_path structures.
168 */
169static struct iucv_path **iucv_path_table;
170static unsigned long iucv_max_pathid;
171
172/*
173 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
174 */
175static DEFINE_SPINLOCK(iucv_table_lock);
176
177/*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700178 * iucv_active_cpu: contains the number of the cpu executing the tasklet
179 * or the work handler. Needed for iucv_path_sever called from tasklet.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800180 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700181static int iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800182
183/*
184 * Mutex and wait queue for iucv_register/iucv_unregister.
185 */
186static DEFINE_MUTEX(iucv_register_mutex);
187
188/*
189 * Counter for number of non-smp capable handlers.
190 */
191static int iucv_nonsmp_handler;
192
193/*
194 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
195 * iucv_path_quiesce and iucv_path_sever.
196 */
197struct iucv_cmd_control {
198 u16 ippathid;
199 u8 ipflags1;
200 u8 iprcode;
201 u16 ipmsglim;
202 u16 res1;
203 u8 ipvmid[8];
204 u8 ipuser[16];
205 u8 iptarget[8];
206} __attribute__ ((packed,aligned(8)));
207
208/*
209 * Data in parameter list iucv structure. Used by iucv_message_send,
210 * iucv_message_send2way and iucv_message_reply.
211 */
212struct iucv_cmd_dpl {
213 u16 ippathid;
214 u8 ipflags1;
215 u8 iprcode;
216 u32 ipmsgid;
217 u32 iptrgcls;
218 u8 iprmmsg[8];
219 u32 ipsrccls;
220 u32 ipmsgtag;
221 u32 ipbfadr2;
222 u32 ipbfln2f;
223 u32 res;
224} __attribute__ ((packed,aligned(8)));
225
226/*
227 * Data in buffer iucv structure. Used by iucv_message_receive,
228 * iucv_message_reject, iucv_message_send, iucv_message_send2way
229 * and iucv_declare_cpu.
230 */
231struct iucv_cmd_db {
232 u16 ippathid;
233 u8 ipflags1;
234 u8 iprcode;
235 u32 ipmsgid;
236 u32 iptrgcls;
237 u32 ipbfadr1;
238 u32 ipbfln1f;
239 u32 ipsrccls;
240 u32 ipmsgtag;
241 u32 ipbfadr2;
242 u32 ipbfln2f;
243 u32 res;
244} __attribute__ ((packed,aligned(8)));
245
246/*
247 * Purge message iucv structure. Used by iucv_message_purge.
248 */
249struct iucv_cmd_purge {
250 u16 ippathid;
251 u8 ipflags1;
252 u8 iprcode;
253 u32 ipmsgid;
254 u8 ipaudit[3];
255 u8 res1[5];
256 u32 res2;
257 u32 ipsrccls;
258 u32 ipmsgtag;
259 u32 res3[3];
260} __attribute__ ((packed,aligned(8)));
261
262/*
263 * Set mask iucv structure. Used by iucv_enable_cpu.
264 */
265struct iucv_cmd_set_mask {
266 u8 ipmask;
267 u8 res1[2];
268 u8 iprcode;
269 u32 res2[9];
270} __attribute__ ((packed,aligned(8)));
271
272union iucv_param {
273 struct iucv_cmd_control ctrl;
274 struct iucv_cmd_dpl dpl;
275 struct iucv_cmd_db db;
276 struct iucv_cmd_purge purge;
277 struct iucv_cmd_set_mask set_mask;
278};
279
280/*
281 * Anchor for per-cpu IUCV command parameter block.
282 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100283static union iucv_param *iucv_param[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800284
285/**
286 * iucv_call_b2f0
287 * @code: identifier of IUCV call to CP.
288 * @parm: pointer to a struct iucv_parm block
289 *
290 * Calls CP to execute IUCV commands.
291 *
292 * Returns the result of the CP IUCV call.
293 */
294static inline int iucv_call_b2f0(int command, union iucv_param *parm)
295{
296 register unsigned long reg0 asm ("0");
297 register unsigned long reg1 asm ("1");
298 int ccode;
299
300 reg0 = command;
301 reg1 = virt_to_phys(parm);
302 asm volatile(
303 " .long 0xb2f01000\n"
304 " ipm %0\n"
305 " srl %0,28\n"
306 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
307 : "m" (*parm) : "cc");
308 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
309}
310
311/**
312 * iucv_query_maxconn
313 *
314 * Determines the maximum number of connections that may be established.
315 *
316 * Returns the maximum number of connections or -EPERM is IUCV is not
317 * available.
318 */
319static int iucv_query_maxconn(void)
320{
321 register unsigned long reg0 asm ("0");
322 register unsigned long reg1 asm ("1");
323 void *param;
324 int ccode;
325
326 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
327 if (!param)
328 return -ENOMEM;
329 reg0 = IUCV_QUERY;
330 reg1 = (unsigned long) param;
331 asm volatile (
332 " .long 0xb2f01000\n"
333 " ipm %0\n"
334 " srl %0,28\n"
335 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
336 if (ccode == 0)
337 iucv_max_pathid = reg0;
338 kfree(param);
339 return ccode ? -EPERM : 0;
340}
341
342/**
343 * iucv_allow_cpu
344 * @data: unused
345 *
346 * Allow iucv interrupts on this cpu.
347 */
348static void iucv_allow_cpu(void *data)
349{
350 int cpu = smp_processor_id();
351 union iucv_param *parm;
352
353 /*
354 * Enable all iucv interrupts.
355 * ipmask contains bits for the different interrupts
356 * 0x80 - Flag to allow nonpriority message pending interrupts
357 * 0x40 - Flag to allow priority message pending interrupts
358 * 0x20 - Flag to allow nonpriority message completion interrupts
359 * 0x10 - Flag to allow priority message completion interrupts
360 * 0x08 - Flag to allow IUCV control interrupts
361 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100362 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800363 memset(parm, 0, sizeof(union iucv_param));
364 parm->set_mask.ipmask = 0xf8;
365 iucv_call_b2f0(IUCV_SETMASK, parm);
366
367 /* Set indication that iucv interrupts are allowed for this cpu. */
368 cpu_set(cpu, iucv_irq_cpumask);
369}
370
371/**
372 * iucv_block_cpu
373 * @data: unused
374 *
375 * Block iucv interrupts on this cpu.
376 */
377static void iucv_block_cpu(void *data)
378{
379 int cpu = smp_processor_id();
380 union iucv_param *parm;
381
382 /* Disable all iucv interrupts. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100383 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800384 memset(parm, 0, sizeof(union iucv_param));
385 iucv_call_b2f0(IUCV_SETMASK, parm);
386
387 /* Clear indication that iucv interrupts are allowed for this cpu. */
388 cpu_clear(cpu, iucv_irq_cpumask);
389}
390
391/**
392 * iucv_declare_cpu
393 * @data: unused
394 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200395 * Declare a interrupt buffer on this cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800396 */
397static void iucv_declare_cpu(void *data)
398{
399 int cpu = smp_processor_id();
400 union iucv_param *parm;
401 int rc;
402
403 if (cpu_isset(cpu, iucv_buffer_cpumask))
404 return;
405
406 /* Declare interrupt buffer. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100407 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800408 memset(parm, 0, sizeof(union iucv_param));
Christoph Lameter70cf50352007-11-20 11:13:38 +0100409 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800410 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
411 if (rc) {
412 char *err = "Unknown";
Heiko Carstensda99f052007-05-04 12:23:27 -0700413 switch (rc) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800414 case 0x03:
415 err = "Directory error";
416 break;
417 case 0x0a:
418 err = "Invalid length";
419 break;
420 case 0x13:
421 err = "Buffer already exists";
422 break;
423 case 0x3e:
424 err = "Buffer overlap";
425 break;
426 case 0x5c:
427 err = "Paging or storage error";
428 break;
429 }
Ursula Braun8f7c5022008-12-25 13:39:47 +0100430 pr_warning("Defining an interrupt buffer on CPU %i"
431 " failed with 0x%02x (%s)\n", cpu, rc, err);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800432 return;
433 }
434
435 /* Set indication that an iucv buffer exists for this cpu. */
436 cpu_set(cpu, iucv_buffer_cpumask);
437
438 if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
439 /* Enable iucv interrupts on this cpu. */
440 iucv_allow_cpu(NULL);
441 else
442 /* Disable iucv interrupts on this cpu. */
443 iucv_block_cpu(NULL);
444}
445
446/**
447 * iucv_retrieve_cpu
448 * @data: unused
449 *
450 * Retrieve interrupt buffer on this cpu.
451 */
452static void iucv_retrieve_cpu(void *data)
453{
454 int cpu = smp_processor_id();
455 union iucv_param *parm;
456
457 if (!cpu_isset(cpu, iucv_buffer_cpumask))
458 return;
459
460 /* Block iucv interrupts. */
461 iucv_block_cpu(NULL);
462
463 /* Retrieve interrupt buffer. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100464 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800465 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
466
467 /* Clear indication that an iucv buffer exists for this cpu. */
468 cpu_clear(cpu, iucv_buffer_cpumask);
469}
470
471/**
472 * iucv_setmask_smp
473 *
474 * Allow iucv interrupts on all cpus.
475 */
476static void iucv_setmask_mp(void)
477{
478 int cpu;
479
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700480 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800481 for_each_online_cpu(cpu)
482 /* Enable all cpus with a declared buffer. */
483 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
484 !cpu_isset(cpu, iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200485 smp_call_function_single(cpu, iucv_allow_cpu,
Jens Axboe8691e5a2008-06-06 11:18:06 +0200486 NULL, 1);
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700487 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800488}
489
490/**
491 * iucv_setmask_up
492 *
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700493 * Allow iucv interrupts on a single cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800494 */
495static void iucv_setmask_up(void)
496{
497 cpumask_t cpumask;
498 int cpu;
499
500 /* Disable all cpu but the first in cpu_irq_cpumask. */
501 cpumask = iucv_irq_cpumask;
502 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
Mike Travis0e12f842008-05-12 21:21:13 +0200503 for_each_cpu_mask_nr(cpu, cpumask)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200504 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800505}
506
507/**
508 * iucv_enable
509 *
510 * This function makes iucv ready for use. It allocates the pathid
511 * table, declares an iucv interrupt buffer and enables the iucv
512 * interrupts. Called when the first user has registered an iucv
513 * handler.
514 */
515static int iucv_enable(void)
516{
517 size_t alloc_size;
518 int cpu, rc;
519
520 rc = -ENOMEM;
521 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
522 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
523 if (!iucv_path_table)
524 goto out;
525 /* Declare per cpu buffers. */
526 rc = -EIO;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700527 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800528 for_each_online_cpu(cpu)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200529 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800530 if (cpus_empty(iucv_buffer_cpumask))
531 /* No cpu could declare an iucv buffer. */
532 goto out_path;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700533 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800534 return 0;
535
536out_path:
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700537 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800538 kfree(iucv_path_table);
539out:
540 return rc;
541}
542
543/**
544 * iucv_disable
545 *
546 * This function shuts down iucv. It disables iucv interrupts, retrieves
547 * the iucv interrupt buffer and frees the pathid table. Called after the
548 * last user unregister its iucv handler.
549 */
550static void iucv_disable(void)
551{
Heiko Carstens8b122ef2008-09-30 03:03:35 -0700552 get_online_cpus();
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200553 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
Heiko Carstens8b122ef2008-09-30 03:03:35 -0700554 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800555 kfree(iucv_path_table);
556}
557
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800558static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
559 unsigned long action, void *hcpu)
560{
561 cpumask_t cpumask;
562 long cpu = (long) hcpu;
563
564 switch (action) {
565 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700566 case CPU_UP_PREPARE_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100567 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
568 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
569 if (!iucv_irq_data[cpu])
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800570 return NOTIFY_BAD;
Christoph Lameter70cf50352007-11-20 11:13:38 +0100571 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
572 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
Akinobu Mitad0236f82008-07-15 02:09:53 -0700573 if (!iucv_param[cpu]) {
574 kfree(iucv_irq_data[cpu]);
575 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800576 return NOTIFY_BAD;
Akinobu Mitad0236f82008-07-15 02:09:53 -0700577 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800578 break;
579 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700580 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800581 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700582 case CPU_DEAD_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100583 kfree(iucv_param[cpu]);
584 iucv_param[cpu] = NULL;
585 kfree(iucv_irq_data[cpu]);
586 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800587 break;
588 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700589 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800590 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700591 case CPU_DOWN_FAILED_FROZEN:
Jens Axboe8691e5a2008-06-06 11:18:06 +0200592 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800593 break;
594 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700595 case CPU_DOWN_PREPARE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800596 cpumask = iucv_buffer_cpumask;
597 cpu_clear(cpu, cpumask);
598 if (cpus_empty(cpumask))
599 /* Can't offline last IUCV enabled cpu. */
600 return NOTIFY_BAD;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200601 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800602 if (cpus_empty(iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200603 smp_call_function_single(first_cpu(iucv_buffer_cpumask),
Jens Axboe8691e5a2008-06-06 11:18:06 +0200604 iucv_allow_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800605 break;
606 }
607 return NOTIFY_OK;
608}
609
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700610static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800611 .notifier_call = iucv_cpu_notify,
612};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800613
614/**
615 * iucv_sever_pathid
616 * @pathid: path identification number.
617 * @userdata: 16-bytes of user data.
618 *
619 * Sever an iucv path to free up the pathid. Used internally.
620 */
621static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
622{
623 union iucv_param *parm;
624
Christoph Lameter70cf50352007-11-20 11:13:38 +0100625 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800626 memset(parm, 0, sizeof(union iucv_param));
627 if (userdata)
628 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
629 parm->ctrl.ippathid = pathid;
630 return iucv_call_b2f0(IUCV_SEVER, parm);
631}
632
633/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700634 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800635 * @dummy: unused dummy argument
636 *
637 * Nop function called via smp_call_function to force work items from
638 * pending external iucv interrupts to the work queue.
639 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700640static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800641{
642}
643
644/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700645 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800646 *
647 * Function called after a path has been severed to find all remaining
648 * work items for the now stale pathid. The caller needs to hold the
649 * iucv_table_lock.
650 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700651static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800652{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700653 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800654
655 /*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700656 * When a path is severed, the pathid can be reused immediatly
657 * on a iucv connect or a connection pending interrupt. Remove
658 * all entries from the task queue that refer to a stale pathid
659 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
660 * or deliver the connection pending interrupt. To get all the
661 * pending interrupts force them to the work queue by calling
662 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800663 */
Jens Axboe8691e5a2008-06-06 11:18:06 +0200664 smp_call_function(__iucv_cleanup_queue, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700665 spin_lock_irq(&iucv_queue_lock);
666 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
667 /* Remove stale work items from the task queue. */
668 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800669 list_del(&p->list);
670 kfree(p);
671 }
672 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700673 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800674}
675
676/**
677 * iucv_register:
678 * @handler: address of iucv handler structure
679 * @smp: != 0 indicates that the handler can deal with out of order messages
680 *
681 * Registers a driver with IUCV.
682 *
683 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
684 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
685 */
686int iucv_register(struct iucv_handler *handler, int smp)
687{
688 int rc;
689
690 if (!iucv_available)
691 return -ENOSYS;
692 mutex_lock(&iucv_register_mutex);
693 if (!smp)
694 iucv_nonsmp_handler++;
695 if (list_empty(&iucv_handler_list)) {
696 rc = iucv_enable();
697 if (rc)
698 goto out_mutex;
699 } else if (!smp && iucv_nonsmp_handler == 1)
700 iucv_setmask_up();
701 INIT_LIST_HEAD(&handler->paths);
702
Ursula Braun435bc9d2008-02-07 18:06:52 -0800703 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800704 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800705 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800706 rc = 0;
707out_mutex:
708 mutex_unlock(&iucv_register_mutex);
709 return rc;
710}
Heiko Carstensda99f052007-05-04 12:23:27 -0700711EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800712
713/**
714 * iucv_unregister
715 * @handler: address of iucv handler structure
716 * @smp: != 0 indicates that the handler can deal with out of order messages
717 *
718 * Unregister driver from IUCV.
719 */
720void iucv_unregister(struct iucv_handler *handler, int smp)
721{
722 struct iucv_path *p, *n;
723
724 mutex_lock(&iucv_register_mutex);
725 spin_lock_bh(&iucv_table_lock);
726 /* Remove handler from the iucv_handler_list. */
727 list_del_init(&handler->list);
728 /* Sever all pathids still refering to the handler. */
729 list_for_each_entry_safe(p, n, &handler->paths, list) {
730 iucv_sever_pathid(p->pathid, NULL);
731 iucv_path_table[p->pathid] = NULL;
732 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800733 iucv_path_free(p);
734 }
735 spin_unlock_bh(&iucv_table_lock);
736 if (!smp)
737 iucv_nonsmp_handler--;
738 if (list_empty(&iucv_handler_list))
739 iucv_disable();
740 else if (!smp && iucv_nonsmp_handler == 0)
741 iucv_setmask_mp();
742 mutex_unlock(&iucv_register_mutex);
743}
Heiko Carstensda99f052007-05-04 12:23:27 -0700744EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800745
746/**
747 * iucv_path_accept
748 * @path: address of iucv path structure
749 * @handler: address of iucv handler structure
750 * @userdata: 16 bytes of data reflected to the communication partner
751 * @private: private data passed to interrupt handlers for this path
752 *
753 * This function is issued after the user received a connection pending
754 * external interrupt and now wishes to complete the IUCV communication path.
755 *
756 * Returns the result of the CP IUCV call.
757 */
758int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
759 u8 userdata[16], void *private)
760{
761 union iucv_param *parm;
762 int rc;
763
764 local_bh_disable();
765 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100766 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800767 memset(parm, 0, sizeof(union iucv_param));
768 parm->ctrl.ippathid = path->pathid;
769 parm->ctrl.ipmsglim = path->msglim;
770 if (userdata)
771 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
772 parm->ctrl.ipflags1 = path->flags;
773
774 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
775 if (!rc) {
776 path->private = private;
777 path->msglim = parm->ctrl.ipmsglim;
778 path->flags = parm->ctrl.ipflags1;
779 }
780 local_bh_enable();
781 return rc;
782}
Heiko Carstensda99f052007-05-04 12:23:27 -0700783EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800784
785/**
786 * iucv_path_connect
787 * @path: address of iucv path structure
788 * @handler: address of iucv handler structure
789 * @userid: 8-byte user identification
790 * @system: 8-byte target system identification
791 * @userdata: 16 bytes of data reflected to the communication partner
792 * @private: private data passed to interrupt handlers for this path
793 *
794 * This function establishes an IUCV path. Although the connect may complete
795 * successfully, you are not able to use the path until you receive an IUCV
796 * Connection Complete external interrupt.
797 *
798 * Returns the result of the CP IUCV call.
799 */
800int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
801 u8 userid[8], u8 system[8], u8 userdata[16],
802 void *private)
803{
804 union iucv_param *parm;
805 int rc;
806
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700807 spin_lock_bh(&iucv_table_lock);
808 iucv_cleanup_queue();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100809 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800810 memset(parm, 0, sizeof(union iucv_param));
811 parm->ctrl.ipmsglim = path->msglim;
812 parm->ctrl.ipflags1 = path->flags;
813 if (userid) {
814 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
815 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
816 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
817 }
818 if (system) {
819 memcpy(parm->ctrl.iptarget, system,
820 sizeof(parm->ctrl.iptarget));
821 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
822 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
823 }
824 if (userdata)
825 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
826
827 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
828 if (!rc) {
829 if (parm->ctrl.ippathid < iucv_max_pathid) {
830 path->pathid = parm->ctrl.ippathid;
831 path->msglim = parm->ctrl.ipmsglim;
832 path->flags = parm->ctrl.ipflags1;
833 path->handler = handler;
834 path->private = private;
835 list_add_tail(&path->list, &handler->paths);
836 iucv_path_table[path->pathid] = path;
837 } else {
838 iucv_sever_pathid(parm->ctrl.ippathid,
839 iucv_error_pathid);
840 rc = -EIO;
841 }
842 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700843 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800844 return rc;
845}
Heiko Carstensda99f052007-05-04 12:23:27 -0700846EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800847
848/**
849 * iucv_path_quiesce:
850 * @path: address of iucv path structure
851 * @userdata: 16 bytes of data reflected to the communication partner
852 *
853 * This function temporarily suspends incoming messages on an IUCV path.
854 * You can later reactivate the path by invoking the iucv_resume function.
855 *
856 * Returns the result from the CP IUCV call.
857 */
858int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
859{
860 union iucv_param *parm;
861 int rc;
862
863 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100864 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800865 memset(parm, 0, sizeof(union iucv_param));
866 if (userdata)
867 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
868 parm->ctrl.ippathid = path->pathid;
869 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
870 local_bh_enable();
871 return rc;
872}
Heiko Carstensda99f052007-05-04 12:23:27 -0700873EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800874
875/**
876 * iucv_path_resume:
877 * @path: address of iucv path structure
878 * @userdata: 16 bytes of data reflected to the communication partner
879 *
880 * This function resumes incoming messages on an IUCV path that has
881 * been stopped with iucv_path_quiesce.
882 *
883 * Returns the result from the CP IUCV call.
884 */
885int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
886{
887 union iucv_param *parm;
888 int rc;
889
890 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100891 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800892 memset(parm, 0, sizeof(union iucv_param));
893 if (userdata)
894 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
895 parm->ctrl.ippathid = path->pathid;
896 rc = iucv_call_b2f0(IUCV_RESUME, parm);
897 local_bh_enable();
898 return rc;
899}
900
901/**
902 * iucv_path_sever
903 * @path: address of iucv path structure
904 * @userdata: 16 bytes of data reflected to the communication partner
905 *
906 * This function terminates an IUCV path.
907 *
908 * Returns the result from the CP IUCV call.
909 */
910int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
911{
912 int rc;
913
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800914 preempt_disable();
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700915 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800916 spin_lock_bh(&iucv_table_lock);
917 rc = iucv_sever_pathid(path->pathid, userdata);
918 if (!rc) {
919 iucv_path_table[path->pathid] = NULL;
920 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800921 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700922 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800923 spin_unlock_bh(&iucv_table_lock);
924 preempt_enable();
925 return rc;
926}
Heiko Carstensda99f052007-05-04 12:23:27 -0700927EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800928
929/**
930 * iucv_message_purge
931 * @path: address of iucv path structure
932 * @msg: address of iucv msg structure
933 * @srccls: source class of message
934 *
935 * Cancels a message you have sent.
936 *
937 * Returns the result from the CP IUCV call.
938 */
939int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
940 u32 srccls)
941{
942 union iucv_param *parm;
943 int rc;
944
945 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100946 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800947 memset(parm, 0, sizeof(union iucv_param));
948 parm->purge.ippathid = path->pathid;
949 parm->purge.ipmsgid = msg->id;
950 parm->purge.ipsrccls = srccls;
951 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
952 rc = iucv_call_b2f0(IUCV_PURGE, parm);
953 if (!rc) {
954 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
955 msg->tag = parm->purge.ipmsgtag;
956 }
957 local_bh_enable();
958 return rc;
959}
Heiko Carstensda99f052007-05-04 12:23:27 -0700960EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800961
962/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +0100963 * iucv_message_receive_iprmdata
964 * @path: address of iucv path structure
965 * @msg: address of iucv msg structure
966 * @flags: how the message is received (IUCV_IPBUFLST)
967 * @buffer: address of data buffer or address of struct iucv_array
968 * @size: length of data buffer
969 * @residual:
970 *
971 * Internal function used by iucv_message_receive and __iucv_message_receive
972 * to receive RMDATA data stored in struct iucv_message.
973 */
974static int iucv_message_receive_iprmdata(struct iucv_path *path,
975 struct iucv_message *msg,
976 u8 flags, void *buffer,
977 size_t size, size_t *residual)
978{
979 struct iucv_array *array;
980 u8 *rmmsg;
981 size_t copy;
982
983 /*
984 * Message is 8 bytes long and has been stored to the
985 * message descriptor itself.
986 */
987 if (residual)
988 *residual = abs(size - 8);
989 rmmsg = msg->rmmsg;
990 if (flags & IUCV_IPBUFLST) {
991 /* Copy to struct iucv_array. */
992 size = (size < 8) ? size : 8;
993 for (array = buffer; size > 0; array++) {
994 copy = min_t(size_t, size, array->length);
995 memcpy((u8 *)(addr_t) array->address,
996 rmmsg, copy);
997 rmmsg += copy;
998 size -= copy;
999 }
1000 } else {
1001 /* Copy to direct buffer. */
1002 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1003 }
1004 return 0;
1005}
1006
1007/**
1008 * __iucv_message_receive
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001009 * @path: address of iucv path structure
1010 * @msg: address of iucv msg structure
1011 * @flags: how the message is received (IUCV_IPBUFLST)
1012 * @buffer: address of data buffer or address of struct iucv_array
1013 * @size: length of data buffer
1014 * @residual:
1015 *
1016 * This function receives messages that are being sent to you over
1017 * established paths. This function will deal with RMDATA messages
1018 * embedded in struct iucv_message as well.
1019 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001020 * Locking: no locking
1021 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001022 * Returns the result from the CP IUCV call.
1023 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001024int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1025 u8 flags, void *buffer, size_t size, size_t *residual)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001026{
1027 union iucv_param *parm;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001028 int rc;
1029
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001030 if (msg->flags & IUCV_IPRMDATA)
1031 return iucv_message_receive_iprmdata(path, msg, flags,
1032 buffer, size, residual);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001033 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001034 memset(parm, 0, sizeof(union iucv_param));
1035 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1036 parm->db.ipbfln1f = (u32) size;
1037 parm->db.ipmsgid = msg->id;
1038 parm->db.ippathid = path->pathid;
1039 parm->db.iptrgcls = msg->class;
1040 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1041 IUCV_IPFGMID | IUCV_IPTRGCLS);
1042 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1043 if (!rc || rc == 5) {
1044 msg->flags = parm->db.ipflags1;
1045 if (residual)
1046 *residual = parm->db.ipbfln1f;
1047 }
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001048 return rc;
1049}
1050EXPORT_SYMBOL(__iucv_message_receive);
1051
1052/**
1053 * iucv_message_receive
1054 * @path: address of iucv path structure
1055 * @msg: address of iucv msg structure
1056 * @flags: how the message is received (IUCV_IPBUFLST)
1057 * @buffer: address of data buffer or address of struct iucv_array
1058 * @size: length of data buffer
1059 * @residual:
1060 *
1061 * This function receives messages that are being sent to you over
1062 * established paths. This function will deal with RMDATA messages
1063 * embedded in struct iucv_message as well.
1064 *
1065 * Locking: local_bh_enable/local_bh_disable
1066 *
1067 * Returns the result from the CP IUCV call.
1068 */
1069int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1070 u8 flags, void *buffer, size_t size, size_t *residual)
1071{
1072 int rc;
1073
1074 if (msg->flags & IUCV_IPRMDATA)
1075 return iucv_message_receive_iprmdata(path, msg, flags,
1076 buffer, size, residual);
1077 local_bh_disable();
1078 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001079 local_bh_enable();
1080 return rc;
1081}
Heiko Carstensda99f052007-05-04 12:23:27 -07001082EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001083
1084/**
1085 * iucv_message_reject
1086 * @path: address of iucv path structure
1087 * @msg: address of iucv msg structure
1088 *
1089 * The reject function refuses a specified message. Between the time you
1090 * are notified of a message and the time that you complete the message,
1091 * the message may be rejected.
1092 *
1093 * Returns the result from the CP IUCV call.
1094 */
1095int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1096{
1097 union iucv_param *parm;
1098 int rc;
1099
1100 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001101 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001102 memset(parm, 0, sizeof(union iucv_param));
1103 parm->db.ippathid = path->pathid;
1104 parm->db.ipmsgid = msg->id;
1105 parm->db.iptrgcls = msg->class;
1106 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1107 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1108 local_bh_enable();
1109 return rc;
1110}
Heiko Carstensda99f052007-05-04 12:23:27 -07001111EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001112
1113/**
1114 * iucv_message_reply
1115 * @path: address of iucv path structure
1116 * @msg: address of iucv msg structure
1117 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1118 * @reply: address of reply data buffer or address of struct iucv_array
1119 * @size: length of reply data buffer
1120 *
1121 * This function responds to the two-way messages that you receive. You
1122 * must identify completely the message to which you wish to reply. ie,
1123 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1124 * the parameter list.
1125 *
1126 * Returns the result from the CP IUCV call.
1127 */
1128int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1129 u8 flags, void *reply, size_t size)
1130{
1131 union iucv_param *parm;
1132 int rc;
1133
1134 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001135 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001136 memset(parm, 0, sizeof(union iucv_param));
1137 if (flags & IUCV_IPRMDATA) {
1138 parm->dpl.ippathid = path->pathid;
1139 parm->dpl.ipflags1 = flags;
1140 parm->dpl.ipmsgid = msg->id;
1141 parm->dpl.iptrgcls = msg->class;
1142 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1143 } else {
1144 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1145 parm->db.ipbfln1f = (u32) size;
1146 parm->db.ippathid = path->pathid;
1147 parm->db.ipflags1 = flags;
1148 parm->db.ipmsgid = msg->id;
1149 parm->db.iptrgcls = msg->class;
1150 }
1151 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1152 local_bh_enable();
1153 return rc;
1154}
Heiko Carstensda99f052007-05-04 12:23:27 -07001155EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001156
1157/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001158 * __iucv_message_send
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001159 * @path: address of iucv path structure
1160 * @msg: address of iucv msg structure
1161 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1162 * @srccls: source class of message
1163 * @buffer: address of send buffer or address of struct iucv_array
1164 * @size: length of send buffer
1165 *
1166 * This function transmits data to another application. Data to be
1167 * transmitted is in a buffer and this is a one-way message and the
1168 * receiver will not reply to the message.
1169 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001170 * Locking: no locking
1171 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001172 * Returns the result from the CP IUCV call.
1173 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001174int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001175 u8 flags, u32 srccls, void *buffer, size_t size)
1176{
1177 union iucv_param *parm;
1178 int rc;
1179
Christoph Lameter70cf50352007-11-20 11:13:38 +01001180 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001181 memset(parm, 0, sizeof(union iucv_param));
1182 if (flags & IUCV_IPRMDATA) {
1183 /* Message of 8 bytes can be placed into the parameter list. */
1184 parm->dpl.ippathid = path->pathid;
1185 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1186 parm->dpl.iptrgcls = msg->class;
1187 parm->dpl.ipsrccls = srccls;
1188 parm->dpl.ipmsgtag = msg->tag;
1189 memcpy(parm->dpl.iprmmsg, buffer, 8);
1190 } else {
1191 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1192 parm->db.ipbfln1f = (u32) size;
1193 parm->db.ippathid = path->pathid;
1194 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1195 parm->db.iptrgcls = msg->class;
1196 parm->db.ipsrccls = srccls;
1197 parm->db.ipmsgtag = msg->tag;
1198 }
1199 rc = iucv_call_b2f0(IUCV_SEND, parm);
1200 if (!rc)
1201 msg->id = parm->db.ipmsgid;
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001202 return rc;
1203}
1204EXPORT_SYMBOL(__iucv_message_send);
1205
1206/**
1207 * iucv_message_send
1208 * @path: address of iucv path structure
1209 * @msg: address of iucv msg structure
1210 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1211 * @srccls: source class of message
1212 * @buffer: address of send buffer or address of struct iucv_array
1213 * @size: length of send buffer
1214 *
1215 * This function transmits data to another application. Data to be
1216 * transmitted is in a buffer and this is a one-way message and the
1217 * receiver will not reply to the message.
1218 *
1219 * Locking: local_bh_enable/local_bh_disable
1220 *
1221 * Returns the result from the CP IUCV call.
1222 */
1223int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1224 u8 flags, u32 srccls, void *buffer, size_t size)
1225{
1226 int rc;
1227
1228 local_bh_disable();
1229 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001230 local_bh_enable();
1231 return rc;
1232}
Heiko Carstensda99f052007-05-04 12:23:27 -07001233EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001234
1235/**
1236 * iucv_message_send2way
1237 * @path: address of iucv path structure
1238 * @msg: address of iucv msg structure
1239 * @flags: how the message is sent and the reply is received
1240 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1241 * @srccls: source class of message
1242 * @buffer: address of send buffer or address of struct iucv_array
1243 * @size: length of send buffer
1244 * @ansbuf: address of answer buffer or address of struct iucv_array
1245 * @asize: size of reply buffer
1246 *
1247 * This function transmits data to another application. Data to be
1248 * transmitted is in a buffer. The receiver of the send is expected to
1249 * reply to the message and a buffer is provided into which IUCV moves
1250 * the reply to this message.
1251 *
1252 * Returns the result from the CP IUCV call.
1253 */
1254int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1255 u8 flags, u32 srccls, void *buffer, size_t size,
1256 void *answer, size_t asize, size_t *residual)
1257{
1258 union iucv_param *parm;
1259 int rc;
1260
1261 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001262 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001263 memset(parm, 0, sizeof(union iucv_param));
1264 if (flags & IUCV_IPRMDATA) {
1265 parm->dpl.ippathid = path->pathid;
1266 parm->dpl.ipflags1 = path->flags; /* priority message */
1267 parm->dpl.iptrgcls = msg->class;
1268 parm->dpl.ipsrccls = srccls;
1269 parm->dpl.ipmsgtag = msg->tag;
1270 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1271 parm->dpl.ipbfln2f = (u32) asize;
1272 memcpy(parm->dpl.iprmmsg, buffer, 8);
1273 } else {
1274 parm->db.ippathid = path->pathid;
1275 parm->db.ipflags1 = path->flags; /* priority message */
1276 parm->db.iptrgcls = msg->class;
1277 parm->db.ipsrccls = srccls;
1278 parm->db.ipmsgtag = msg->tag;
1279 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1280 parm->db.ipbfln1f = (u32) size;
1281 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1282 parm->db.ipbfln2f = (u32) asize;
1283 }
1284 rc = iucv_call_b2f0(IUCV_SEND, parm);
1285 if (!rc)
1286 msg->id = parm->db.ipmsgid;
1287 local_bh_enable();
1288 return rc;
1289}
Heiko Carstensda99f052007-05-04 12:23:27 -07001290EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001291
1292/**
1293 * iucv_path_pending
1294 * @data: Pointer to external interrupt buffer
1295 *
1296 * Process connection pending work item. Called from tasklet while holding
1297 * iucv_table_lock.
1298 */
1299struct iucv_path_pending {
1300 u16 ippathid;
1301 u8 ipflags1;
1302 u8 iptype;
1303 u16 ipmsglim;
1304 u16 res1;
1305 u8 ipvmid[8];
1306 u8 ipuser[16];
1307 u32 res3;
1308 u8 ippollfg;
1309 u8 res4[3];
1310} __attribute__ ((packed));
1311
1312static void iucv_path_pending(struct iucv_irq_data *data)
1313{
1314 struct iucv_path_pending *ipp = (void *) data;
1315 struct iucv_handler *handler;
1316 struct iucv_path *path;
1317 char *error;
1318
1319 BUG_ON(iucv_path_table[ipp->ippathid]);
1320 /* New pathid, handler found. Create a new path struct. */
1321 error = iucv_error_no_memory;
1322 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1323 if (!path)
1324 goto out_sever;
1325 path->pathid = ipp->ippathid;
1326 iucv_path_table[path->pathid] = path;
1327 EBCASC(ipp->ipvmid, 8);
1328
1329 /* Call registered handler until one is found that wants the path. */
1330 list_for_each_entry(handler, &iucv_handler_list, list) {
1331 if (!handler->path_pending)
1332 continue;
1333 /*
1334 * Add path to handler to allow a call to iucv_path_sever
1335 * inside the path_pending function. If the handler returns
1336 * an error remove the path from the handler again.
1337 */
1338 list_add(&path->list, &handler->paths);
1339 path->handler = handler;
1340 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1341 return;
1342 list_del(&path->list);
1343 path->handler = NULL;
1344 }
1345 /* No handler wanted the path. */
1346 iucv_path_table[path->pathid] = NULL;
1347 iucv_path_free(path);
1348 error = iucv_error_no_listener;
1349out_sever:
1350 iucv_sever_pathid(ipp->ippathid, error);
1351}
1352
1353/**
1354 * iucv_path_complete
1355 * @data: Pointer to external interrupt buffer
1356 *
1357 * Process connection complete work item. Called from tasklet while holding
1358 * iucv_table_lock.
1359 */
1360struct iucv_path_complete {
1361 u16 ippathid;
1362 u8 ipflags1;
1363 u8 iptype;
1364 u16 ipmsglim;
1365 u16 res1;
1366 u8 res2[8];
1367 u8 ipuser[16];
1368 u32 res3;
1369 u8 ippollfg;
1370 u8 res4[3];
1371} __attribute__ ((packed));
1372
1373static void iucv_path_complete(struct iucv_irq_data *data)
1374{
1375 struct iucv_path_complete *ipc = (void *) data;
1376 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1377
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001378 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001379 path->handler->path_complete(path, ipc->ipuser);
1380}
1381
1382/**
1383 * iucv_path_severed
1384 * @data: Pointer to external interrupt buffer
1385 *
1386 * Process connection severed work item. Called from tasklet while holding
1387 * iucv_table_lock.
1388 */
1389struct iucv_path_severed {
1390 u16 ippathid;
1391 u8 res1;
1392 u8 iptype;
1393 u32 res2;
1394 u8 res3[8];
1395 u8 ipuser[16];
1396 u32 res4;
1397 u8 ippollfg;
1398 u8 res5[3];
1399} __attribute__ ((packed));
1400
1401static void iucv_path_severed(struct iucv_irq_data *data)
1402{
1403 struct iucv_path_severed *ips = (void *) data;
1404 struct iucv_path *path = iucv_path_table[ips->ippathid];
1405
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001406 if (!path || !path->handler) /* Already severed */
1407 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001408 if (path->handler->path_severed)
1409 path->handler->path_severed(path, ips->ipuser);
1410 else {
1411 iucv_sever_pathid(path->pathid, NULL);
1412 iucv_path_table[path->pathid] = NULL;
1413 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001414 iucv_path_free(path);
1415 }
1416}
1417
1418/**
1419 * iucv_path_quiesced
1420 * @data: Pointer to external interrupt buffer
1421 *
1422 * Process connection quiesced work item. Called from tasklet while holding
1423 * iucv_table_lock.
1424 */
1425struct iucv_path_quiesced {
1426 u16 ippathid;
1427 u8 res1;
1428 u8 iptype;
1429 u32 res2;
1430 u8 res3[8];
1431 u8 ipuser[16];
1432 u32 res4;
1433 u8 ippollfg;
1434 u8 res5[3];
1435} __attribute__ ((packed));
1436
1437static void iucv_path_quiesced(struct iucv_irq_data *data)
1438{
1439 struct iucv_path_quiesced *ipq = (void *) data;
1440 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1441
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001442 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001443 path->handler->path_quiesced(path, ipq->ipuser);
1444}
1445
1446/**
1447 * iucv_path_resumed
1448 * @data: Pointer to external interrupt buffer
1449 *
1450 * Process connection resumed work item. Called from tasklet while holding
1451 * iucv_table_lock.
1452 */
1453struct iucv_path_resumed {
1454 u16 ippathid;
1455 u8 res1;
1456 u8 iptype;
1457 u32 res2;
1458 u8 res3[8];
1459 u8 ipuser[16];
1460 u32 res4;
1461 u8 ippollfg;
1462 u8 res5[3];
1463} __attribute__ ((packed));
1464
1465static void iucv_path_resumed(struct iucv_irq_data *data)
1466{
1467 struct iucv_path_resumed *ipr = (void *) data;
1468 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1469
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001470 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001471 path->handler->path_resumed(path, ipr->ipuser);
1472}
1473
1474/**
1475 * iucv_message_complete
1476 * @data: Pointer to external interrupt buffer
1477 *
1478 * Process message complete work item. Called from tasklet while holding
1479 * iucv_table_lock.
1480 */
1481struct iucv_message_complete {
1482 u16 ippathid;
1483 u8 ipflags1;
1484 u8 iptype;
1485 u32 ipmsgid;
1486 u32 ipaudit;
1487 u8 iprmmsg[8];
1488 u32 ipsrccls;
1489 u32 ipmsgtag;
1490 u32 res;
1491 u32 ipbfln2f;
1492 u8 ippollfg;
1493 u8 res2[3];
1494} __attribute__ ((packed));
1495
1496static void iucv_message_complete(struct iucv_irq_data *data)
1497{
1498 struct iucv_message_complete *imc = (void *) data;
1499 struct iucv_path *path = iucv_path_table[imc->ippathid];
1500 struct iucv_message msg;
1501
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001502 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001503 msg.flags = imc->ipflags1;
1504 msg.id = imc->ipmsgid;
1505 msg.audit = imc->ipaudit;
1506 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1507 msg.class = imc->ipsrccls;
1508 msg.tag = imc->ipmsgtag;
1509 msg.length = imc->ipbfln2f;
1510 path->handler->message_complete(path, &msg);
1511 }
1512}
1513
1514/**
1515 * iucv_message_pending
1516 * @data: Pointer to external interrupt buffer
1517 *
1518 * Process message pending work item. Called from tasklet while holding
1519 * iucv_table_lock.
1520 */
1521struct iucv_message_pending {
1522 u16 ippathid;
1523 u8 ipflags1;
1524 u8 iptype;
1525 u32 ipmsgid;
1526 u32 iptrgcls;
1527 union {
1528 u32 iprmmsg1_u32;
1529 u8 iprmmsg1[4];
1530 } ln1msg1;
1531 union {
1532 u32 ipbfln1f;
1533 u8 iprmmsg2[4];
1534 } ln1msg2;
1535 u32 res1[3];
1536 u32 ipbfln2f;
1537 u8 ippollfg;
1538 u8 res2[3];
1539} __attribute__ ((packed));
1540
1541static void iucv_message_pending(struct iucv_irq_data *data)
1542{
1543 struct iucv_message_pending *imp = (void *) data;
1544 struct iucv_path *path = iucv_path_table[imp->ippathid];
1545 struct iucv_message msg;
1546
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001547 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001548 msg.flags = imp->ipflags1;
1549 msg.id = imp->ipmsgid;
1550 msg.class = imp->iptrgcls;
1551 if (imp->ipflags1 & IUCV_IPRMDATA) {
1552 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1553 msg.length = 8;
1554 } else
1555 msg.length = imp->ln1msg2.ipbfln1f;
1556 msg.reply_size = imp->ipbfln2f;
1557 path->handler->message_pending(path, &msg);
1558 }
1559}
1560
1561/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001562 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001563 *
1564 * This tasklet loops over the queue of irq buffers created by
1565 * iucv_external_interrupt, calls the appropriate action handler
1566 * and then frees the buffer.
1567 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001568static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001569{
1570 typedef void iucv_irq_fn(struct iucv_irq_data *);
1571 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001572 [0x02] = iucv_path_complete,
1573 [0x03] = iucv_path_severed,
1574 [0x04] = iucv_path_quiesced,
1575 [0x05] = iucv_path_resumed,
1576 [0x06] = iucv_message_complete,
1577 [0x07] = iucv_message_complete,
1578 [0x08] = iucv_message_pending,
1579 [0x09] = iucv_message_pending,
1580 };
Denis Chengb5e78332007-12-07 00:51:45 -08001581 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001582 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001583
1584 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001585 if (!spin_trylock(&iucv_table_lock)) {
1586 tasklet_schedule(&iucv_tasklet);
1587 return;
1588 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001589 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001590
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001591 spin_lock_irq(&iucv_queue_lock);
1592 list_splice_init(&iucv_task_queue, &task_queue);
1593 spin_unlock_irq(&iucv_queue_lock);
1594
1595 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001596 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001597 irq_fn[p->data.iptype](&p->data);
1598 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001599 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001600
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001601 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001602 spin_unlock(&iucv_table_lock);
1603}
1604
1605/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001606 * iucv_work_fn:
1607 *
1608 * This work function loops over the queue of path pending irq blocks
1609 * created by iucv_external_interrupt, calls the appropriate action
1610 * handler and then frees the buffer.
1611 */
1612static void iucv_work_fn(struct work_struct *work)
1613{
1614 typedef void iucv_irq_fn(struct iucv_irq_data *);
Denis Chengb5e78332007-12-07 00:51:45 -08001615 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001616 struct iucv_irq_list *p, *n;
1617
1618 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1619 spin_lock_bh(&iucv_table_lock);
1620 iucv_active_cpu = smp_processor_id();
1621
1622 spin_lock_irq(&iucv_queue_lock);
1623 list_splice_init(&iucv_work_queue, &work_queue);
1624 spin_unlock_irq(&iucv_queue_lock);
1625
1626 iucv_cleanup_queue();
1627 list_for_each_entry_safe(p, n, &work_queue, list) {
1628 list_del_init(&p->list);
1629 iucv_path_pending(&p->data);
1630 kfree(p);
1631 }
1632
1633 iucv_active_cpu = -1;
1634 spin_unlock_bh(&iucv_table_lock);
1635}
1636
1637/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001638 * iucv_external_interrupt
1639 * @code: irq code
1640 *
1641 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001642 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001643 */
1644static void iucv_external_interrupt(u16 code)
1645{
1646 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001647 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001648
Christoph Lameter70cf50352007-11-20 11:13:38 +01001649 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001650 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001651 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001652 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1653 return;
1654 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001655 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001656 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001657 if (!work) {
Ursula Braun8f7c5022008-12-25 13:39:47 +01001658 pr_warning("iucv_external_interrupt: out of memory\n");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001659 return;
1660 }
1661 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001662 spin_lock(&iucv_queue_lock);
1663 if (p->iptype == 0x01) {
1664 /* Path pending interrupt. */
1665 list_add_tail(&work->list, &iucv_work_queue);
1666 schedule_work(&iucv_work);
1667 } else {
1668 /* The other interrupts. */
1669 list_add_tail(&work->list, &iucv_task_queue);
1670 tasklet_schedule(&iucv_tasklet);
1671 }
1672 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001673}
1674
1675/**
1676 * iucv_init
1677 *
1678 * Allocates and initializes various data structures.
1679 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001680static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001681{
1682 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001683 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001684
1685 if (!MACHINE_IS_VM) {
1686 rc = -EPROTONOSUPPORT;
1687 goto out;
1688 }
1689 rc = iucv_query_maxconn();
1690 if (rc)
1691 goto out;
Heiko Carstensda99f052007-05-04 12:23:27 -07001692 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001693 if (rc)
1694 goto out;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001695 iucv_root = s390_root_dev_register("iucv");
1696 if (IS_ERR(iucv_root)) {
1697 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001698 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001699 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001700
1701 for_each_online_cpu(cpu) {
1702 /* Note: GFP_DMA used to get memory below 2G */
1703 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1704 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1705 if (!iucv_irq_data[cpu]) {
1706 rc = -ENOMEM;
1707 goto out_free;
1708 }
1709
1710 /* Allocate parameter blocks. */
1711 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1712 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1713 if (!iucv_param[cpu]) {
1714 rc = -ENOMEM;
1715 goto out_free;
1716 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001717 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001718 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1719 if (rc)
1720 goto out_free;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001721 ASCEBC(iucv_error_no_listener, 16);
1722 ASCEBC(iucv_error_no_memory, 16);
1723 ASCEBC(iucv_error_pathid, 16);
1724 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001725 rc = bus_register(&iucv_bus);
1726 if (rc)
1727 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001728 return 0;
1729
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001730out_cpu:
1731 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001732out_free:
1733 for_each_possible_cpu(cpu) {
1734 kfree(iucv_param[cpu]);
1735 iucv_param[cpu] = NULL;
1736 kfree(iucv_irq_data[cpu]);
1737 iucv_irq_data[cpu] = NULL;
1738 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001739 s390_root_dev_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001740out_int:
1741 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1742out:
1743 return rc;
1744}
1745
1746/**
1747 * iucv_exit
1748 *
1749 * Frees everything allocated from iucv_init.
1750 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001751static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001752{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001753 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001754 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001755
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001756 spin_lock_irq(&iucv_queue_lock);
1757 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1758 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001759 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1760 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001761 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001762 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001763 for_each_possible_cpu(cpu) {
1764 kfree(iucv_param[cpu]);
1765 iucv_param[cpu] = NULL;
1766 kfree(iucv_irq_data[cpu]);
1767 iucv_irq_data[cpu] = NULL;
1768 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001769 s390_root_dev_unregister(iucv_root);
1770 bus_unregister(&iucv_bus);
1771 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1772}
1773
1774subsys_initcall(iucv_init);
1775module_exit(iucv_exit);
1776
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001777MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1778MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1779MODULE_LICENSE("GPL");