blob: a35240f61ec3bad362fed2da6378920b3f4fcd99 [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>
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080053#include <asm/smp.h>
54
55/*
56 * FLAGS:
57 * All flags are defined in the field IPFLAGS1 of each function
58 * and can be found in CP Programming Services.
59 * IPSRCCLS - Indicates you have specified a source class.
60 * IPTRGCLS - Indicates you have specified a target class.
61 * IPFGPID - Indicates you have specified a pathid.
62 * IPFGMID - Indicates you have specified a message ID.
63 * IPNORPY - Indicates a one-way message. No reply expected.
64 * IPALL - Indicates that all paths are affected.
65 */
66#define IUCV_IPSRCCLS 0x01
67#define IUCV_IPTRGCLS 0x01
68#define IUCV_IPFGPID 0x02
69#define IUCV_IPFGMID 0x04
70#define IUCV_IPNORPY 0x10
71#define IUCV_IPALL 0x80
72
Heiko Carstensda99f052007-05-04 12:23:27 -070073static int iucv_bus_match(struct device *dev, struct device_driver *drv)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080074{
75 return 0;
76}
77
78struct bus_type iucv_bus = {
79 .name = "iucv",
80 .match = iucv_bus_match,
81};
Heiko Carstensda99f052007-05-04 12:23:27 -070082EXPORT_SYMBOL(iucv_bus);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080083
84struct device *iucv_root;
Heiko Carstensda99f052007-05-04 12:23:27 -070085EXPORT_SYMBOL(iucv_root);
86
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080087static int iucv_available;
88
89/* General IUCV interrupt structure */
90struct iucv_irq_data {
91 u16 ippathid;
92 u8 ipflags1;
93 u8 iptype;
94 u32 res2[8];
95};
96
Martin Schwidefsky04b090d2007-04-28 23:03:59 -070097struct iucv_irq_list {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -080098 struct list_head list;
99 struct iucv_irq_data data;
100};
101
Christoph Lameter70cf50352007-11-20 11:13:38 +0100102static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800103static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
104static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
105
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700106/*
107 * Queue of interrupt buffers lock for delivery via the tasklet
108 * (fast but can't call smp_call_function).
109 */
110static LIST_HEAD(iucv_task_queue);
111
112/*
113 * The tasklet for fast delivery of iucv interrupts.
114 */
115static void iucv_tasklet_fn(unsigned long);
116static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
117
118/*
119 * Queue of interrupt buffers for delivery via a work queue
120 * (slower but can call smp_call_function).
121 */
122static LIST_HEAD(iucv_work_queue);
123
124/*
125 * The work element to deliver path pending interrupts.
126 */
127static void iucv_work_fn(struct work_struct *work);
128static DECLARE_WORK(iucv_work, iucv_work_fn);
129
130/*
131 * Spinlock protecting task and work queue.
132 */
133static DEFINE_SPINLOCK(iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800134
135enum iucv_command_codes {
136 IUCV_QUERY = 0,
137 IUCV_RETRIEVE_BUFFER = 2,
138 IUCV_SEND = 4,
139 IUCV_RECEIVE = 5,
140 IUCV_REPLY = 6,
141 IUCV_REJECT = 8,
142 IUCV_PURGE = 9,
143 IUCV_ACCEPT = 10,
144 IUCV_CONNECT = 11,
145 IUCV_DECLARE_BUFFER = 12,
146 IUCV_QUIESCE = 13,
147 IUCV_RESUME = 14,
148 IUCV_SEVER = 15,
149 IUCV_SETMASK = 16,
150};
151
152/*
153 * Error messages that are used with the iucv_sever function. They get
154 * converted to EBCDIC.
155 */
156static char iucv_error_no_listener[16] = "NO LISTENER";
157static char iucv_error_no_memory[16] = "NO MEMORY";
158static char iucv_error_pathid[16] = "INVALID PATHID";
159
160/*
161 * iucv_handler_list: List of registered handlers.
162 */
163static LIST_HEAD(iucv_handler_list);
164
165/*
166 * iucv_path_table: an array of iucv_path structures.
167 */
168static struct iucv_path **iucv_path_table;
169static unsigned long iucv_max_pathid;
170
171/*
172 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
173 */
174static DEFINE_SPINLOCK(iucv_table_lock);
175
176/*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700177 * iucv_active_cpu: contains the number of the cpu executing the tasklet
178 * or the work handler. Needed for iucv_path_sever called from tasklet.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800179 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700180static int iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800181
182/*
183 * Mutex and wait queue for iucv_register/iucv_unregister.
184 */
185static DEFINE_MUTEX(iucv_register_mutex);
186
187/*
188 * Counter for number of non-smp capable handlers.
189 */
190static int iucv_nonsmp_handler;
191
192/*
193 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
194 * iucv_path_quiesce and iucv_path_sever.
195 */
196struct iucv_cmd_control {
197 u16 ippathid;
198 u8 ipflags1;
199 u8 iprcode;
200 u16 ipmsglim;
201 u16 res1;
202 u8 ipvmid[8];
203 u8 ipuser[16];
204 u8 iptarget[8];
205} __attribute__ ((packed,aligned(8)));
206
207/*
208 * Data in parameter list iucv structure. Used by iucv_message_send,
209 * iucv_message_send2way and iucv_message_reply.
210 */
211struct iucv_cmd_dpl {
212 u16 ippathid;
213 u8 ipflags1;
214 u8 iprcode;
215 u32 ipmsgid;
216 u32 iptrgcls;
217 u8 iprmmsg[8];
218 u32 ipsrccls;
219 u32 ipmsgtag;
220 u32 ipbfadr2;
221 u32 ipbfln2f;
222 u32 res;
223} __attribute__ ((packed,aligned(8)));
224
225/*
226 * Data in buffer iucv structure. Used by iucv_message_receive,
227 * iucv_message_reject, iucv_message_send, iucv_message_send2way
228 * and iucv_declare_cpu.
229 */
230struct iucv_cmd_db {
231 u16 ippathid;
232 u8 ipflags1;
233 u8 iprcode;
234 u32 ipmsgid;
235 u32 iptrgcls;
236 u32 ipbfadr1;
237 u32 ipbfln1f;
238 u32 ipsrccls;
239 u32 ipmsgtag;
240 u32 ipbfadr2;
241 u32 ipbfln2f;
242 u32 res;
243} __attribute__ ((packed,aligned(8)));
244
245/*
246 * Purge message iucv structure. Used by iucv_message_purge.
247 */
248struct iucv_cmd_purge {
249 u16 ippathid;
250 u8 ipflags1;
251 u8 iprcode;
252 u32 ipmsgid;
253 u8 ipaudit[3];
254 u8 res1[5];
255 u32 res2;
256 u32 ipsrccls;
257 u32 ipmsgtag;
258 u32 res3[3];
259} __attribute__ ((packed,aligned(8)));
260
261/*
262 * Set mask iucv structure. Used by iucv_enable_cpu.
263 */
264struct iucv_cmd_set_mask {
265 u8 ipmask;
266 u8 res1[2];
267 u8 iprcode;
268 u32 res2[9];
269} __attribute__ ((packed,aligned(8)));
270
271union iucv_param {
272 struct iucv_cmd_control ctrl;
273 struct iucv_cmd_dpl dpl;
274 struct iucv_cmd_db db;
275 struct iucv_cmd_purge purge;
276 struct iucv_cmd_set_mask set_mask;
277};
278
279/*
280 * Anchor for per-cpu IUCV command parameter block.
281 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100282static union iucv_param *iucv_param[NR_CPUS];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800283
284/**
285 * iucv_call_b2f0
286 * @code: identifier of IUCV call to CP.
287 * @parm: pointer to a struct iucv_parm block
288 *
289 * Calls CP to execute IUCV commands.
290 *
291 * Returns the result of the CP IUCV call.
292 */
293static inline int iucv_call_b2f0(int command, union iucv_param *parm)
294{
295 register unsigned long reg0 asm ("0");
296 register unsigned long reg1 asm ("1");
297 int ccode;
298
299 reg0 = command;
300 reg1 = virt_to_phys(parm);
301 asm volatile(
302 " .long 0xb2f01000\n"
303 " ipm %0\n"
304 " srl %0,28\n"
305 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
306 : "m" (*parm) : "cc");
307 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
308}
309
310/**
311 * iucv_query_maxconn
312 *
313 * Determines the maximum number of connections that may be established.
314 *
315 * Returns the maximum number of connections or -EPERM is IUCV is not
316 * available.
317 */
318static int iucv_query_maxconn(void)
319{
320 register unsigned long reg0 asm ("0");
321 register unsigned long reg1 asm ("1");
322 void *param;
323 int ccode;
324
325 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
326 if (!param)
327 return -ENOMEM;
328 reg0 = IUCV_QUERY;
329 reg1 = (unsigned long) param;
330 asm volatile (
331 " .long 0xb2f01000\n"
332 " ipm %0\n"
333 " srl %0,28\n"
334 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
335 if (ccode == 0)
336 iucv_max_pathid = reg0;
337 kfree(param);
338 return ccode ? -EPERM : 0;
339}
340
341/**
342 * iucv_allow_cpu
343 * @data: unused
344 *
345 * Allow iucv interrupts on this cpu.
346 */
347static void iucv_allow_cpu(void *data)
348{
349 int cpu = smp_processor_id();
350 union iucv_param *parm;
351
352 /*
353 * Enable all iucv interrupts.
354 * ipmask contains bits for the different interrupts
355 * 0x80 - Flag to allow nonpriority message pending interrupts
356 * 0x40 - Flag to allow priority message pending interrupts
357 * 0x20 - Flag to allow nonpriority message completion interrupts
358 * 0x10 - Flag to allow priority message completion interrupts
359 * 0x08 - Flag to allow IUCV control interrupts
360 */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100361 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800362 memset(parm, 0, sizeof(union iucv_param));
363 parm->set_mask.ipmask = 0xf8;
364 iucv_call_b2f0(IUCV_SETMASK, parm);
365
366 /* Set indication that iucv interrupts are allowed for this cpu. */
367 cpu_set(cpu, iucv_irq_cpumask);
368}
369
370/**
371 * iucv_block_cpu
372 * @data: unused
373 *
374 * Block iucv interrupts on this cpu.
375 */
376static void iucv_block_cpu(void *data)
377{
378 int cpu = smp_processor_id();
379 union iucv_param *parm;
380
381 /* Disable all iucv interrupts. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100382 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800383 memset(parm, 0, sizeof(union iucv_param));
384 iucv_call_b2f0(IUCV_SETMASK, parm);
385
386 /* Clear indication that iucv interrupts are allowed for this cpu. */
387 cpu_clear(cpu, iucv_irq_cpumask);
388}
389
390/**
391 * iucv_declare_cpu
392 * @data: unused
393 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200394 * Declare a interrupt buffer on this cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800395 */
396static void iucv_declare_cpu(void *data)
397{
398 int cpu = smp_processor_id();
399 union iucv_param *parm;
400 int rc;
401
402 if (cpu_isset(cpu, iucv_buffer_cpumask))
403 return;
404
405 /* Declare interrupt buffer. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100406 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800407 memset(parm, 0, sizeof(union iucv_param));
Christoph Lameter70cf50352007-11-20 11:13:38 +0100408 parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800409 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
410 if (rc) {
411 char *err = "Unknown";
Heiko Carstensda99f052007-05-04 12:23:27 -0700412 switch (rc) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800413 case 0x03:
414 err = "Directory error";
415 break;
416 case 0x0a:
417 err = "Invalid length";
418 break;
419 case 0x13:
420 err = "Buffer already exists";
421 break;
422 case 0x3e:
423 err = "Buffer overlap";
424 break;
425 case 0x5c:
426 err = "Paging or storage error";
427 break;
428 }
Ursula Braun8f7c5022008-12-25 13:39:47 +0100429 pr_warning("Defining an interrupt buffer on CPU %i"
430 " failed with 0x%02x (%s)\n", cpu, rc, err);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800431 return;
432 }
433
434 /* Set indication that an iucv buffer exists for this cpu. */
435 cpu_set(cpu, iucv_buffer_cpumask);
436
437 if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
438 /* Enable iucv interrupts on this cpu. */
439 iucv_allow_cpu(NULL);
440 else
441 /* Disable iucv interrupts on this cpu. */
442 iucv_block_cpu(NULL);
443}
444
445/**
446 * iucv_retrieve_cpu
447 * @data: unused
448 *
449 * Retrieve interrupt buffer on this cpu.
450 */
451static void iucv_retrieve_cpu(void *data)
452{
453 int cpu = smp_processor_id();
454 union iucv_param *parm;
455
456 if (!cpu_isset(cpu, iucv_buffer_cpumask))
457 return;
458
459 /* Block iucv interrupts. */
460 iucv_block_cpu(NULL);
461
462 /* Retrieve interrupt buffer. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100463 parm = iucv_param[cpu];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800464 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
465
466 /* Clear indication that an iucv buffer exists for this cpu. */
467 cpu_clear(cpu, iucv_buffer_cpumask);
468}
469
470/**
471 * iucv_setmask_smp
472 *
473 * Allow iucv interrupts on all cpus.
474 */
475static void iucv_setmask_mp(void)
476{
477 int cpu;
478
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700479 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800480 for_each_online_cpu(cpu)
481 /* Enable all cpus with a declared buffer. */
482 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
483 !cpu_isset(cpu, iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200484 smp_call_function_single(cpu, iucv_allow_cpu,
Jens Axboe8691e5a2008-06-06 11:18:06 +0200485 NULL, 1);
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700486 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800487}
488
489/**
490 * iucv_setmask_up
491 *
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700492 * Allow iucv interrupts on a single cpu.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800493 */
494static void iucv_setmask_up(void)
495{
496 cpumask_t cpumask;
497 int cpu;
498
499 /* Disable all cpu but the first in cpu_irq_cpumask. */
500 cpumask = iucv_irq_cpumask;
501 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
Mike Travis0e12f842008-05-12 21:21:13 +0200502 for_each_cpu_mask_nr(cpu, cpumask)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200503 smp_call_function_single(cpu, iucv_block_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800504}
505
506/**
507 * iucv_enable
508 *
509 * This function makes iucv ready for use. It allocates the pathid
510 * table, declares an iucv interrupt buffer and enables the iucv
511 * interrupts. Called when the first user has registered an iucv
512 * handler.
513 */
514static int iucv_enable(void)
515{
516 size_t alloc_size;
517 int cpu, rc;
518
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800519 get_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800520 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;
527 for_each_online_cpu(cpu)
Jens Axboe8691e5a2008-06-06 11:18:06 +0200528 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800529 if (cpus_empty(iucv_buffer_cpumask))
530 /* No cpu could declare an iucv buffer. */
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800531 goto out;
Heiko Carstens7b9d1b22008-06-09 15:50:30 -0700532 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800533 return 0;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800534out:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800535 kfree(iucv_path_table);
536 iucv_path_table = NULL;
537 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800538 return rc;
539}
540
541/**
542 * iucv_disable
543 *
544 * This function shuts down iucv. It disables iucv interrupts, retrieves
545 * the iucv interrupt buffer and frees the pathid table. Called after the
546 * last user unregister its iucv handler.
547 */
548static void iucv_disable(void)
549{
Heiko Carstens8b122ef2008-09-30 03:03:35 -0700550 get_online_cpus();
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200551 on_each_cpu(iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800552 kfree(iucv_path_table);
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800553 iucv_path_table = NULL;
554 put_online_cpus();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800555}
556
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800557static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
558 unsigned long action, void *hcpu)
559{
560 cpumask_t cpumask;
561 long cpu = (long) hcpu;
562
563 switch (action) {
564 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700565 case CPU_UP_PREPARE_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100566 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
567 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
568 if (!iucv_irq_data[cpu])
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800569 return NOTIFY_BAD;
Christoph Lameter70cf50352007-11-20 11:13:38 +0100570 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
571 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
Akinobu Mitad0236f82008-07-15 02:09:53 -0700572 if (!iucv_param[cpu]) {
573 kfree(iucv_irq_data[cpu]);
574 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800575 return NOTIFY_BAD;
Akinobu Mitad0236f82008-07-15 02:09:53 -0700576 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800577 break;
578 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700579 case CPU_UP_CANCELED_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800580 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700581 case CPU_DEAD_FROZEN:
Christoph Lameter70cf50352007-11-20 11:13:38 +0100582 kfree(iucv_param[cpu]);
583 iucv_param[cpu] = NULL;
584 kfree(iucv_irq_data[cpu]);
585 iucv_irq_data[cpu] = NULL;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800586 break;
587 case CPU_ONLINE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700588 case CPU_ONLINE_FROZEN:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800589 case CPU_DOWN_FAILED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700590 case CPU_DOWN_FAILED_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800591 if (!iucv_path_table)
592 break;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200593 smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800594 break;
595 case CPU_DOWN_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700596 case CPU_DOWN_PREPARE_FROZEN:
Heiko Carstensf1d3e4d2009-01-05 18:09:02 -0800597 if (!iucv_path_table)
598 break;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800599 cpumask = iucv_buffer_cpumask;
600 cpu_clear(cpu, cpumask);
601 if (cpus_empty(cpumask))
602 /* Can't offline last IUCV enabled cpu. */
603 return NOTIFY_BAD;
Jens Axboe8691e5a2008-06-06 11:18:06 +0200604 smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800605 if (cpus_empty(iucv_irq_cpumask))
Heiko Carstens3bb447f2007-07-27 12:29:08 +0200606 smp_call_function_single(first_cpu(iucv_buffer_cpumask),
Jens Axboe8691e5a2008-06-06 11:18:06 +0200607 iucv_allow_cpu, NULL, 1);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800608 break;
609 }
610 return NOTIFY_OK;
611}
612
Heiko Carstensf1494ed2008-06-09 15:49:57 -0700613static struct notifier_block __refdata iucv_cpu_notifier = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800614 .notifier_call = iucv_cpu_notify,
615};
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800616
617/**
618 * iucv_sever_pathid
619 * @pathid: path identification number.
620 * @userdata: 16-bytes of user data.
621 *
622 * Sever an iucv path to free up the pathid. Used internally.
623 */
624static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
625{
626 union iucv_param *parm;
627
Christoph Lameter70cf50352007-11-20 11:13:38 +0100628 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800629 memset(parm, 0, sizeof(union iucv_param));
630 if (userdata)
631 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
632 parm->ctrl.ippathid = pathid;
633 return iucv_call_b2f0(IUCV_SEVER, parm);
634}
635
636/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700637 * __iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800638 * @dummy: unused dummy argument
639 *
640 * Nop function called via smp_call_function to force work items from
641 * pending external iucv interrupts to the work queue.
642 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700643static void __iucv_cleanup_queue(void *dummy)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800644{
645}
646
647/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700648 * iucv_cleanup_queue
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800649 *
650 * Function called after a path has been severed to find all remaining
651 * work items for the now stale pathid. The caller needs to hold the
652 * iucv_table_lock.
653 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700654static void iucv_cleanup_queue(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800655{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700656 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800657
658 /*
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700659 * When a path is severed, the pathid can be reused immediatly
660 * on a iucv connect or a connection pending interrupt. Remove
661 * all entries from the task queue that refer to a stale pathid
662 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
663 * or deliver the connection pending interrupt. To get all the
664 * pending interrupts force them to the work queue by calling
665 * an empty function on all cpus.
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800666 */
Jens Axboe8691e5a2008-06-06 11:18:06 +0200667 smp_call_function(__iucv_cleanup_queue, NULL, 1);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700668 spin_lock_irq(&iucv_queue_lock);
669 list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
670 /* Remove stale work items from the task queue. */
671 if (iucv_path_table[p->data.ippathid] == NULL) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800672 list_del(&p->list);
673 kfree(p);
674 }
675 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700676 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800677}
678
679/**
680 * iucv_register:
681 * @handler: address of iucv handler structure
682 * @smp: != 0 indicates that the handler can deal with out of order messages
683 *
684 * Registers a driver with IUCV.
685 *
686 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
687 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
688 */
689int iucv_register(struct iucv_handler *handler, int smp)
690{
691 int rc;
692
693 if (!iucv_available)
694 return -ENOSYS;
695 mutex_lock(&iucv_register_mutex);
696 if (!smp)
697 iucv_nonsmp_handler++;
698 if (list_empty(&iucv_handler_list)) {
699 rc = iucv_enable();
700 if (rc)
701 goto out_mutex;
702 } else if (!smp && iucv_nonsmp_handler == 1)
703 iucv_setmask_up();
704 INIT_LIST_HEAD(&handler->paths);
705
Ursula Braun435bc9d2008-02-07 18:06:52 -0800706 spin_lock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800707 list_add_tail(&handler->list, &iucv_handler_list);
Ursula Braun435bc9d2008-02-07 18:06:52 -0800708 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800709 rc = 0;
710out_mutex:
711 mutex_unlock(&iucv_register_mutex);
712 return rc;
713}
Heiko Carstensda99f052007-05-04 12:23:27 -0700714EXPORT_SYMBOL(iucv_register);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800715
716/**
717 * iucv_unregister
718 * @handler: address of iucv handler structure
719 * @smp: != 0 indicates that the handler can deal with out of order messages
720 *
721 * Unregister driver from IUCV.
722 */
723void iucv_unregister(struct iucv_handler *handler, int smp)
724{
725 struct iucv_path *p, *n;
726
727 mutex_lock(&iucv_register_mutex);
728 spin_lock_bh(&iucv_table_lock);
729 /* Remove handler from the iucv_handler_list. */
730 list_del_init(&handler->list);
731 /* Sever all pathids still refering to the handler. */
732 list_for_each_entry_safe(p, n, &handler->paths, list) {
733 iucv_sever_pathid(p->pathid, NULL);
734 iucv_path_table[p->pathid] = NULL;
735 list_del(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800736 iucv_path_free(p);
737 }
738 spin_unlock_bh(&iucv_table_lock);
739 if (!smp)
740 iucv_nonsmp_handler--;
741 if (list_empty(&iucv_handler_list))
742 iucv_disable();
743 else if (!smp && iucv_nonsmp_handler == 0)
744 iucv_setmask_mp();
745 mutex_unlock(&iucv_register_mutex);
746}
Heiko Carstensda99f052007-05-04 12:23:27 -0700747EXPORT_SYMBOL(iucv_unregister);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800748
749/**
750 * iucv_path_accept
751 * @path: address of iucv path structure
752 * @handler: address of iucv handler structure
753 * @userdata: 16 bytes of data reflected to the communication partner
754 * @private: private data passed to interrupt handlers for this path
755 *
756 * This function is issued after the user received a connection pending
757 * external interrupt and now wishes to complete the IUCV communication path.
758 *
759 * Returns the result of the CP IUCV call.
760 */
761int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
762 u8 userdata[16], void *private)
763{
764 union iucv_param *parm;
765 int rc;
766
767 local_bh_disable();
768 /* Prepare parameter block. */
Christoph Lameter70cf50352007-11-20 11:13:38 +0100769 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800770 memset(parm, 0, sizeof(union iucv_param));
771 parm->ctrl.ippathid = path->pathid;
772 parm->ctrl.ipmsglim = path->msglim;
773 if (userdata)
774 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
775 parm->ctrl.ipflags1 = path->flags;
776
777 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
778 if (!rc) {
779 path->private = private;
780 path->msglim = parm->ctrl.ipmsglim;
781 path->flags = parm->ctrl.ipflags1;
782 }
783 local_bh_enable();
784 return rc;
785}
Heiko Carstensda99f052007-05-04 12:23:27 -0700786EXPORT_SYMBOL(iucv_path_accept);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800787
788/**
789 * iucv_path_connect
790 * @path: address of iucv path structure
791 * @handler: address of iucv handler structure
792 * @userid: 8-byte user identification
793 * @system: 8-byte target system identification
794 * @userdata: 16 bytes of data reflected to the communication partner
795 * @private: private data passed to interrupt handlers for this path
796 *
797 * This function establishes an IUCV path. Although the connect may complete
798 * successfully, you are not able to use the path until you receive an IUCV
799 * Connection Complete external interrupt.
800 *
801 * Returns the result of the CP IUCV call.
802 */
803int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
804 u8 userid[8], u8 system[8], u8 userdata[16],
805 void *private)
806{
807 union iucv_param *parm;
808 int rc;
809
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700810 spin_lock_bh(&iucv_table_lock);
811 iucv_cleanup_queue();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100812 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800813 memset(parm, 0, sizeof(union iucv_param));
814 parm->ctrl.ipmsglim = path->msglim;
815 parm->ctrl.ipflags1 = path->flags;
816 if (userid) {
817 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
818 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
819 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
820 }
821 if (system) {
822 memcpy(parm->ctrl.iptarget, system,
823 sizeof(parm->ctrl.iptarget));
824 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
825 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
826 }
827 if (userdata)
828 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
829
830 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
831 if (!rc) {
832 if (parm->ctrl.ippathid < iucv_max_pathid) {
833 path->pathid = parm->ctrl.ippathid;
834 path->msglim = parm->ctrl.ipmsglim;
835 path->flags = parm->ctrl.ipflags1;
836 path->handler = handler;
837 path->private = private;
838 list_add_tail(&path->list, &handler->paths);
839 iucv_path_table[path->pathid] = path;
840 } else {
841 iucv_sever_pathid(parm->ctrl.ippathid,
842 iucv_error_pathid);
843 rc = -EIO;
844 }
845 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700846 spin_unlock_bh(&iucv_table_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800847 return rc;
848}
Heiko Carstensda99f052007-05-04 12:23:27 -0700849EXPORT_SYMBOL(iucv_path_connect);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800850
851/**
852 * iucv_path_quiesce:
853 * @path: address of iucv path structure
854 * @userdata: 16 bytes of data reflected to the communication partner
855 *
856 * This function temporarily suspends incoming messages on an IUCV path.
857 * You can later reactivate the path by invoking the iucv_resume function.
858 *
859 * Returns the result from the CP IUCV call.
860 */
861int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
862{
863 union iucv_param *parm;
864 int rc;
865
866 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100867 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800868 memset(parm, 0, sizeof(union iucv_param));
869 if (userdata)
870 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
871 parm->ctrl.ippathid = path->pathid;
872 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
873 local_bh_enable();
874 return rc;
875}
Heiko Carstensda99f052007-05-04 12:23:27 -0700876EXPORT_SYMBOL(iucv_path_quiesce);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800877
878/**
879 * iucv_path_resume:
880 * @path: address of iucv path structure
881 * @userdata: 16 bytes of data reflected to the communication partner
882 *
883 * This function resumes incoming messages on an IUCV path that has
884 * been stopped with iucv_path_quiesce.
885 *
886 * Returns the result from the CP IUCV call.
887 */
888int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
889{
890 union iucv_param *parm;
891 int rc;
892
893 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100894 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800895 memset(parm, 0, sizeof(union iucv_param));
896 if (userdata)
897 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
898 parm->ctrl.ippathid = path->pathid;
899 rc = iucv_call_b2f0(IUCV_RESUME, parm);
900 local_bh_enable();
901 return rc;
902}
903
904/**
905 * iucv_path_sever
906 * @path: address of iucv path structure
907 * @userdata: 16 bytes of data reflected to the communication partner
908 *
909 * This function terminates an IUCV path.
910 *
911 * Returns the result from the CP IUCV call.
912 */
913int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
914{
915 int rc;
916
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800917 preempt_disable();
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700918 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800919 spin_lock_bh(&iucv_table_lock);
920 rc = iucv_sever_pathid(path->pathid, userdata);
921 if (!rc) {
922 iucv_path_table[path->pathid] = NULL;
923 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800924 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -0700925 if (iucv_active_cpu != smp_processor_id())
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800926 spin_unlock_bh(&iucv_table_lock);
927 preempt_enable();
928 return rc;
929}
Heiko Carstensda99f052007-05-04 12:23:27 -0700930EXPORT_SYMBOL(iucv_path_sever);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800931
932/**
933 * iucv_message_purge
934 * @path: address of iucv path structure
935 * @msg: address of iucv msg structure
936 * @srccls: source class of message
937 *
938 * Cancels a message you have sent.
939 *
940 * Returns the result from the CP IUCV call.
941 */
942int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
943 u32 srccls)
944{
945 union iucv_param *parm;
946 int rc;
947
948 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +0100949 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800950 memset(parm, 0, sizeof(union iucv_param));
951 parm->purge.ippathid = path->pathid;
952 parm->purge.ipmsgid = msg->id;
953 parm->purge.ipsrccls = srccls;
954 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
955 rc = iucv_call_b2f0(IUCV_PURGE, parm);
956 if (!rc) {
957 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
958 msg->tag = parm->purge.ipmsgtag;
959 }
960 local_bh_enable();
961 return rc;
962}
Heiko Carstensda99f052007-05-04 12:23:27 -0700963EXPORT_SYMBOL(iucv_message_purge);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -0800964
965/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +0100966 * iucv_message_receive_iprmdata
967 * @path: address of iucv path structure
968 * @msg: address of iucv msg structure
969 * @flags: how the message is received (IUCV_IPBUFLST)
970 * @buffer: address of data buffer or address of struct iucv_array
971 * @size: length of data buffer
972 * @residual:
973 *
974 * Internal function used by iucv_message_receive and __iucv_message_receive
975 * to receive RMDATA data stored in struct iucv_message.
976 */
977static int iucv_message_receive_iprmdata(struct iucv_path *path,
978 struct iucv_message *msg,
979 u8 flags, void *buffer,
980 size_t size, size_t *residual)
981{
982 struct iucv_array *array;
983 u8 *rmmsg;
984 size_t copy;
985
986 /*
987 * Message is 8 bytes long and has been stored to the
988 * message descriptor itself.
989 */
990 if (residual)
991 *residual = abs(size - 8);
992 rmmsg = msg->rmmsg;
993 if (flags & IUCV_IPBUFLST) {
994 /* Copy to struct iucv_array. */
995 size = (size < 8) ? size : 8;
996 for (array = buffer; size > 0; array++) {
997 copy = min_t(size_t, size, array->length);
998 memcpy((u8 *)(addr_t) array->address,
999 rmmsg, copy);
1000 rmmsg += copy;
1001 size -= copy;
1002 }
1003 } else {
1004 /* Copy to direct buffer. */
1005 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
1006 }
1007 return 0;
1008}
1009
1010/**
1011 * __iucv_message_receive
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001012 * @path: address of iucv path structure
1013 * @msg: address of iucv msg structure
1014 * @flags: how the message is received (IUCV_IPBUFLST)
1015 * @buffer: address of data buffer or address of struct iucv_array
1016 * @size: length of data buffer
1017 * @residual:
1018 *
1019 * This function receives messages that are being sent to you over
1020 * established paths. This function will deal with RMDATA messages
1021 * embedded in struct iucv_message as well.
1022 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001023 * Locking: no locking
1024 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001025 * Returns the result from the CP IUCV call.
1026 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001027int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1028 u8 flags, void *buffer, size_t size, size_t *residual)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001029{
1030 union iucv_param *parm;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001031 int rc;
1032
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001033 if (msg->flags & IUCV_IPRMDATA)
1034 return iucv_message_receive_iprmdata(path, msg, flags,
1035 buffer, size, residual);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001036 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001037 memset(parm, 0, sizeof(union iucv_param));
1038 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1039 parm->db.ipbfln1f = (u32) size;
1040 parm->db.ipmsgid = msg->id;
1041 parm->db.ippathid = path->pathid;
1042 parm->db.iptrgcls = msg->class;
1043 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
1044 IUCV_IPFGMID | IUCV_IPTRGCLS);
1045 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
1046 if (!rc || rc == 5) {
1047 msg->flags = parm->db.ipflags1;
1048 if (residual)
1049 *residual = parm->db.ipbfln1f;
1050 }
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001051 return rc;
1052}
1053EXPORT_SYMBOL(__iucv_message_receive);
1054
1055/**
1056 * iucv_message_receive
1057 * @path: address of iucv path structure
1058 * @msg: address of iucv msg structure
1059 * @flags: how the message is received (IUCV_IPBUFLST)
1060 * @buffer: address of data buffer or address of struct iucv_array
1061 * @size: length of data buffer
1062 * @residual:
1063 *
1064 * This function receives messages that are being sent to you over
1065 * established paths. This function will deal with RMDATA messages
1066 * embedded in struct iucv_message as well.
1067 *
1068 * Locking: local_bh_enable/local_bh_disable
1069 *
1070 * Returns the result from the CP IUCV call.
1071 */
1072int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
1073 u8 flags, void *buffer, size_t size, size_t *residual)
1074{
1075 int rc;
1076
1077 if (msg->flags & IUCV_IPRMDATA)
1078 return iucv_message_receive_iprmdata(path, msg, flags,
1079 buffer, size, residual);
1080 local_bh_disable();
1081 rc = __iucv_message_receive(path, msg, flags, buffer, size, residual);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001082 local_bh_enable();
1083 return rc;
1084}
Heiko Carstensda99f052007-05-04 12:23:27 -07001085EXPORT_SYMBOL(iucv_message_receive);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001086
1087/**
1088 * iucv_message_reject
1089 * @path: address of iucv path structure
1090 * @msg: address of iucv msg structure
1091 *
1092 * The reject function refuses a specified message. Between the time you
1093 * are notified of a message and the time that you complete the message,
1094 * the message may be rejected.
1095 *
1096 * Returns the result from the CP IUCV call.
1097 */
1098int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1099{
1100 union iucv_param *parm;
1101 int rc;
1102
1103 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001104 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001105 memset(parm, 0, sizeof(union iucv_param));
1106 parm->db.ippathid = path->pathid;
1107 parm->db.ipmsgid = msg->id;
1108 parm->db.iptrgcls = msg->class;
1109 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1110 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1111 local_bh_enable();
1112 return rc;
1113}
Heiko Carstensda99f052007-05-04 12:23:27 -07001114EXPORT_SYMBOL(iucv_message_reject);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001115
1116/**
1117 * iucv_message_reply
1118 * @path: address of iucv path structure
1119 * @msg: address of iucv msg structure
1120 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1121 * @reply: address of reply data buffer or address of struct iucv_array
1122 * @size: length of reply data buffer
1123 *
1124 * This function responds to the two-way messages that you receive. You
1125 * must identify completely the message to which you wish to reply. ie,
1126 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1127 * the parameter list.
1128 *
1129 * Returns the result from the CP IUCV call.
1130 */
1131int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1132 u8 flags, void *reply, size_t size)
1133{
1134 union iucv_param *parm;
1135 int rc;
1136
1137 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001138 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001139 memset(parm, 0, sizeof(union iucv_param));
1140 if (flags & IUCV_IPRMDATA) {
1141 parm->dpl.ippathid = path->pathid;
1142 parm->dpl.ipflags1 = flags;
1143 parm->dpl.ipmsgid = msg->id;
1144 parm->dpl.iptrgcls = msg->class;
1145 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1146 } else {
1147 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1148 parm->db.ipbfln1f = (u32) size;
1149 parm->db.ippathid = path->pathid;
1150 parm->db.ipflags1 = flags;
1151 parm->db.ipmsgid = msg->id;
1152 parm->db.iptrgcls = msg->class;
1153 }
1154 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1155 local_bh_enable();
1156 return rc;
1157}
Heiko Carstensda99f052007-05-04 12:23:27 -07001158EXPORT_SYMBOL(iucv_message_reply);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001159
1160/**
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001161 * __iucv_message_send
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001162 * @path: address of iucv path structure
1163 * @msg: address of iucv msg structure
1164 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1165 * @srccls: source class of message
1166 * @buffer: address of send buffer or address of struct iucv_array
1167 * @size: length of send buffer
1168 *
1169 * This function transmits data to another application. Data to be
1170 * transmitted is in a buffer and this is a one-way message and the
1171 * receiver will not reply to the message.
1172 *
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001173 * Locking: no locking
1174 *
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001175 * Returns the result from the CP IUCV call.
1176 */
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001177int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001178 u8 flags, u32 srccls, void *buffer, size_t size)
1179{
1180 union iucv_param *parm;
1181 int rc;
1182
Christoph Lameter70cf50352007-11-20 11:13:38 +01001183 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001184 memset(parm, 0, sizeof(union iucv_param));
1185 if (flags & IUCV_IPRMDATA) {
1186 /* Message of 8 bytes can be placed into the parameter list. */
1187 parm->dpl.ippathid = path->pathid;
1188 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1189 parm->dpl.iptrgcls = msg->class;
1190 parm->dpl.ipsrccls = srccls;
1191 parm->dpl.ipmsgtag = msg->tag;
1192 memcpy(parm->dpl.iprmmsg, buffer, 8);
1193 } else {
1194 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1195 parm->db.ipbfln1f = (u32) size;
1196 parm->db.ippathid = path->pathid;
1197 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1198 parm->db.iptrgcls = msg->class;
1199 parm->db.ipsrccls = srccls;
1200 parm->db.ipmsgtag = msg->tag;
1201 }
1202 rc = iucv_call_b2f0(IUCV_SEND, parm);
1203 if (!rc)
1204 msg->id = parm->db.ipmsgid;
Hendrik Brueckner91d5d45e2008-12-25 13:38:58 +01001205 return rc;
1206}
1207EXPORT_SYMBOL(__iucv_message_send);
1208
1209/**
1210 * iucv_message_send
1211 * @path: address of iucv path structure
1212 * @msg: address of iucv msg structure
1213 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1214 * @srccls: source class of message
1215 * @buffer: address of send buffer or address of struct iucv_array
1216 * @size: length of send buffer
1217 *
1218 * This function transmits data to another application. Data to be
1219 * transmitted is in a buffer and this is a one-way message and the
1220 * receiver will not reply to the message.
1221 *
1222 * Locking: local_bh_enable/local_bh_disable
1223 *
1224 * Returns the result from the CP IUCV call.
1225 */
1226int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1227 u8 flags, u32 srccls, void *buffer, size_t size)
1228{
1229 int rc;
1230
1231 local_bh_disable();
1232 rc = __iucv_message_send(path, msg, flags, srccls, buffer, size);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001233 local_bh_enable();
1234 return rc;
1235}
Heiko Carstensda99f052007-05-04 12:23:27 -07001236EXPORT_SYMBOL(iucv_message_send);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001237
1238/**
1239 * iucv_message_send2way
1240 * @path: address of iucv path structure
1241 * @msg: address of iucv msg structure
1242 * @flags: how the message is sent and the reply is received
1243 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1244 * @srccls: source class of message
1245 * @buffer: address of send buffer or address of struct iucv_array
1246 * @size: length of send buffer
1247 * @ansbuf: address of answer buffer or address of struct iucv_array
1248 * @asize: size of reply buffer
1249 *
1250 * This function transmits data to another application. Data to be
1251 * transmitted is in a buffer. The receiver of the send is expected to
1252 * reply to the message and a buffer is provided into which IUCV moves
1253 * the reply to this message.
1254 *
1255 * Returns the result from the CP IUCV call.
1256 */
1257int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1258 u8 flags, u32 srccls, void *buffer, size_t size,
1259 void *answer, size_t asize, size_t *residual)
1260{
1261 union iucv_param *parm;
1262 int rc;
1263
1264 local_bh_disable();
Christoph Lameter70cf50352007-11-20 11:13:38 +01001265 parm = iucv_param[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001266 memset(parm, 0, sizeof(union iucv_param));
1267 if (flags & IUCV_IPRMDATA) {
1268 parm->dpl.ippathid = path->pathid;
1269 parm->dpl.ipflags1 = path->flags; /* priority message */
1270 parm->dpl.iptrgcls = msg->class;
1271 parm->dpl.ipsrccls = srccls;
1272 parm->dpl.ipmsgtag = msg->tag;
1273 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1274 parm->dpl.ipbfln2f = (u32) asize;
1275 memcpy(parm->dpl.iprmmsg, buffer, 8);
1276 } else {
1277 parm->db.ippathid = path->pathid;
1278 parm->db.ipflags1 = path->flags; /* priority message */
1279 parm->db.iptrgcls = msg->class;
1280 parm->db.ipsrccls = srccls;
1281 parm->db.ipmsgtag = msg->tag;
1282 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1283 parm->db.ipbfln1f = (u32) size;
1284 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1285 parm->db.ipbfln2f = (u32) asize;
1286 }
1287 rc = iucv_call_b2f0(IUCV_SEND, parm);
1288 if (!rc)
1289 msg->id = parm->db.ipmsgid;
1290 local_bh_enable();
1291 return rc;
1292}
Heiko Carstensda99f052007-05-04 12:23:27 -07001293EXPORT_SYMBOL(iucv_message_send2way);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001294
1295/**
1296 * iucv_path_pending
1297 * @data: Pointer to external interrupt buffer
1298 *
1299 * Process connection pending work item. Called from tasklet while holding
1300 * iucv_table_lock.
1301 */
1302struct iucv_path_pending {
1303 u16 ippathid;
1304 u8 ipflags1;
1305 u8 iptype;
1306 u16 ipmsglim;
1307 u16 res1;
1308 u8 ipvmid[8];
1309 u8 ipuser[16];
1310 u32 res3;
1311 u8 ippollfg;
1312 u8 res4[3];
1313} __attribute__ ((packed));
1314
1315static void iucv_path_pending(struct iucv_irq_data *data)
1316{
1317 struct iucv_path_pending *ipp = (void *) data;
1318 struct iucv_handler *handler;
1319 struct iucv_path *path;
1320 char *error;
1321
1322 BUG_ON(iucv_path_table[ipp->ippathid]);
1323 /* New pathid, handler found. Create a new path struct. */
1324 error = iucv_error_no_memory;
1325 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1326 if (!path)
1327 goto out_sever;
1328 path->pathid = ipp->ippathid;
1329 iucv_path_table[path->pathid] = path;
1330 EBCASC(ipp->ipvmid, 8);
1331
1332 /* Call registered handler until one is found that wants the path. */
1333 list_for_each_entry(handler, &iucv_handler_list, list) {
1334 if (!handler->path_pending)
1335 continue;
1336 /*
1337 * Add path to handler to allow a call to iucv_path_sever
1338 * inside the path_pending function. If the handler returns
1339 * an error remove the path from the handler again.
1340 */
1341 list_add(&path->list, &handler->paths);
1342 path->handler = handler;
1343 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1344 return;
1345 list_del(&path->list);
1346 path->handler = NULL;
1347 }
1348 /* No handler wanted the path. */
1349 iucv_path_table[path->pathid] = NULL;
1350 iucv_path_free(path);
1351 error = iucv_error_no_listener;
1352out_sever:
1353 iucv_sever_pathid(ipp->ippathid, error);
1354}
1355
1356/**
1357 * iucv_path_complete
1358 * @data: Pointer to external interrupt buffer
1359 *
1360 * Process connection complete work item. Called from tasklet while holding
1361 * iucv_table_lock.
1362 */
1363struct iucv_path_complete {
1364 u16 ippathid;
1365 u8 ipflags1;
1366 u8 iptype;
1367 u16 ipmsglim;
1368 u16 res1;
1369 u8 res2[8];
1370 u8 ipuser[16];
1371 u32 res3;
1372 u8 ippollfg;
1373 u8 res4[3];
1374} __attribute__ ((packed));
1375
1376static void iucv_path_complete(struct iucv_irq_data *data)
1377{
1378 struct iucv_path_complete *ipc = (void *) data;
1379 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1380
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001381 if (path && path->handler && path->handler->path_complete)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001382 path->handler->path_complete(path, ipc->ipuser);
1383}
1384
1385/**
1386 * iucv_path_severed
1387 * @data: Pointer to external interrupt buffer
1388 *
1389 * Process connection severed work item. Called from tasklet while holding
1390 * iucv_table_lock.
1391 */
1392struct iucv_path_severed {
1393 u16 ippathid;
1394 u8 res1;
1395 u8 iptype;
1396 u32 res2;
1397 u8 res3[8];
1398 u8 ipuser[16];
1399 u32 res4;
1400 u8 ippollfg;
1401 u8 res5[3];
1402} __attribute__ ((packed));
1403
1404static void iucv_path_severed(struct iucv_irq_data *data)
1405{
1406 struct iucv_path_severed *ips = (void *) data;
1407 struct iucv_path *path = iucv_path_table[ips->ippathid];
1408
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001409 if (!path || !path->handler) /* Already severed */
1410 return;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001411 if (path->handler->path_severed)
1412 path->handler->path_severed(path, ips->ipuser);
1413 else {
1414 iucv_sever_pathid(path->pathid, NULL);
1415 iucv_path_table[path->pathid] = NULL;
1416 list_del_init(&path->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001417 iucv_path_free(path);
1418 }
1419}
1420
1421/**
1422 * iucv_path_quiesced
1423 * @data: Pointer to external interrupt buffer
1424 *
1425 * Process connection quiesced work item. Called from tasklet while holding
1426 * iucv_table_lock.
1427 */
1428struct iucv_path_quiesced {
1429 u16 ippathid;
1430 u8 res1;
1431 u8 iptype;
1432 u32 res2;
1433 u8 res3[8];
1434 u8 ipuser[16];
1435 u32 res4;
1436 u8 ippollfg;
1437 u8 res5[3];
1438} __attribute__ ((packed));
1439
1440static void iucv_path_quiesced(struct iucv_irq_data *data)
1441{
1442 struct iucv_path_quiesced *ipq = (void *) data;
1443 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1444
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001445 if (path && path->handler && path->handler->path_quiesced)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001446 path->handler->path_quiesced(path, ipq->ipuser);
1447}
1448
1449/**
1450 * iucv_path_resumed
1451 * @data: Pointer to external interrupt buffer
1452 *
1453 * Process connection resumed work item. Called from tasklet while holding
1454 * iucv_table_lock.
1455 */
1456struct iucv_path_resumed {
1457 u16 ippathid;
1458 u8 res1;
1459 u8 iptype;
1460 u32 res2;
1461 u8 res3[8];
1462 u8 ipuser[16];
1463 u32 res4;
1464 u8 ippollfg;
1465 u8 res5[3];
1466} __attribute__ ((packed));
1467
1468static void iucv_path_resumed(struct iucv_irq_data *data)
1469{
1470 struct iucv_path_resumed *ipr = (void *) data;
1471 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1472
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001473 if (path && path->handler && path->handler->path_resumed)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001474 path->handler->path_resumed(path, ipr->ipuser);
1475}
1476
1477/**
1478 * iucv_message_complete
1479 * @data: Pointer to external interrupt buffer
1480 *
1481 * Process message complete work item. Called from tasklet while holding
1482 * iucv_table_lock.
1483 */
1484struct iucv_message_complete {
1485 u16 ippathid;
1486 u8 ipflags1;
1487 u8 iptype;
1488 u32 ipmsgid;
1489 u32 ipaudit;
1490 u8 iprmmsg[8];
1491 u32 ipsrccls;
1492 u32 ipmsgtag;
1493 u32 res;
1494 u32 ipbfln2f;
1495 u8 ippollfg;
1496 u8 res2[3];
1497} __attribute__ ((packed));
1498
1499static void iucv_message_complete(struct iucv_irq_data *data)
1500{
1501 struct iucv_message_complete *imc = (void *) data;
1502 struct iucv_path *path = iucv_path_table[imc->ippathid];
1503 struct iucv_message msg;
1504
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001505 if (path && path->handler && path->handler->message_complete) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001506 msg.flags = imc->ipflags1;
1507 msg.id = imc->ipmsgid;
1508 msg.audit = imc->ipaudit;
1509 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1510 msg.class = imc->ipsrccls;
1511 msg.tag = imc->ipmsgtag;
1512 msg.length = imc->ipbfln2f;
1513 path->handler->message_complete(path, &msg);
1514 }
1515}
1516
1517/**
1518 * iucv_message_pending
1519 * @data: Pointer to external interrupt buffer
1520 *
1521 * Process message pending work item. Called from tasklet while holding
1522 * iucv_table_lock.
1523 */
1524struct iucv_message_pending {
1525 u16 ippathid;
1526 u8 ipflags1;
1527 u8 iptype;
1528 u32 ipmsgid;
1529 u32 iptrgcls;
1530 union {
1531 u32 iprmmsg1_u32;
1532 u8 iprmmsg1[4];
1533 } ln1msg1;
1534 union {
1535 u32 ipbfln1f;
1536 u8 iprmmsg2[4];
1537 } ln1msg2;
1538 u32 res1[3];
1539 u32 ipbfln2f;
1540 u8 ippollfg;
1541 u8 res2[3];
1542} __attribute__ ((packed));
1543
1544static void iucv_message_pending(struct iucv_irq_data *data)
1545{
1546 struct iucv_message_pending *imp = (void *) data;
1547 struct iucv_path *path = iucv_path_table[imp->ippathid];
1548 struct iucv_message msg;
1549
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001550 if (path && path->handler && path->handler->message_pending) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001551 msg.flags = imp->ipflags1;
1552 msg.id = imp->ipmsgid;
1553 msg.class = imp->iptrgcls;
1554 if (imp->ipflags1 & IUCV_IPRMDATA) {
1555 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1556 msg.length = 8;
1557 } else
1558 msg.length = imp->ln1msg2.ipbfln1f;
1559 msg.reply_size = imp->ipbfln2f;
1560 path->handler->message_pending(path, &msg);
1561 }
1562}
1563
1564/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001565 * iucv_tasklet_fn:
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001566 *
1567 * This tasklet loops over the queue of irq buffers created by
1568 * iucv_external_interrupt, calls the appropriate action handler
1569 * and then frees the buffer.
1570 */
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001571static void iucv_tasklet_fn(unsigned long ignored)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001572{
1573 typedef void iucv_irq_fn(struct iucv_irq_data *);
1574 static iucv_irq_fn *irq_fn[] = {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001575 [0x02] = iucv_path_complete,
1576 [0x03] = iucv_path_severed,
1577 [0x04] = iucv_path_quiesced,
1578 [0x05] = iucv_path_resumed,
1579 [0x06] = iucv_message_complete,
1580 [0x07] = iucv_message_complete,
1581 [0x08] = iucv_message_pending,
1582 [0x09] = iucv_message_pending,
1583 };
Denis Chengb5e78332007-12-07 00:51:45 -08001584 LIST_HEAD(task_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001585 struct iucv_irq_list *p, *n;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001586
1587 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
Ursula Braun13fdc9a2007-07-14 19:03:41 -07001588 if (!spin_trylock(&iucv_table_lock)) {
1589 tasklet_schedule(&iucv_tasklet);
1590 return;
1591 }
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001592 iucv_active_cpu = smp_processor_id();
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001593
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001594 spin_lock_irq(&iucv_queue_lock);
1595 list_splice_init(&iucv_task_queue, &task_queue);
1596 spin_unlock_irq(&iucv_queue_lock);
1597
1598 list_for_each_entry_safe(p, n, &task_queue, list) {
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001599 list_del_init(&p->list);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001600 irq_fn[p->data.iptype](&p->data);
1601 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001602 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001603
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001604 iucv_active_cpu = -1;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001605 spin_unlock(&iucv_table_lock);
1606}
1607
1608/**
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001609 * iucv_work_fn:
1610 *
1611 * This work function loops over the queue of path pending irq blocks
1612 * created by iucv_external_interrupt, calls the appropriate action
1613 * handler and then frees the buffer.
1614 */
1615static void iucv_work_fn(struct work_struct *work)
1616{
1617 typedef void iucv_irq_fn(struct iucv_irq_data *);
Denis Chengb5e78332007-12-07 00:51:45 -08001618 LIST_HEAD(work_queue);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001619 struct iucv_irq_list *p, *n;
1620
1621 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1622 spin_lock_bh(&iucv_table_lock);
1623 iucv_active_cpu = smp_processor_id();
1624
1625 spin_lock_irq(&iucv_queue_lock);
1626 list_splice_init(&iucv_work_queue, &work_queue);
1627 spin_unlock_irq(&iucv_queue_lock);
1628
1629 iucv_cleanup_queue();
1630 list_for_each_entry_safe(p, n, &work_queue, list) {
1631 list_del_init(&p->list);
1632 iucv_path_pending(&p->data);
1633 kfree(p);
1634 }
1635
1636 iucv_active_cpu = -1;
1637 spin_unlock_bh(&iucv_table_lock);
1638}
1639
1640/**
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001641 * iucv_external_interrupt
1642 * @code: irq code
1643 *
1644 * Handles external interrupts coming in from CP.
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001645 * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn().
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001646 */
1647static void iucv_external_interrupt(u16 code)
1648{
1649 struct iucv_irq_data *p;
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001650 struct iucv_irq_list *work;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001651
Christoph Lameter70cf50352007-11-20 11:13:38 +01001652 p = iucv_irq_data[smp_processor_id()];
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001653 if (p->ippathid >= iucv_max_pathid) {
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001654 WARN_ON(p->ippathid >= iucv_max_pathid);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001655 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1656 return;
1657 }
Ursula Braunc2b4afd2008-07-14 09:59:29 +02001658 BUG_ON(p->iptype < 0x01 || p->iptype > 0x09);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001659 work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001660 if (!work) {
Ursula Braun8f7c5022008-12-25 13:39:47 +01001661 pr_warning("iucv_external_interrupt: out of memory\n");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001662 return;
1663 }
1664 memcpy(&work->data, p, sizeof(work->data));
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001665 spin_lock(&iucv_queue_lock);
1666 if (p->iptype == 0x01) {
1667 /* Path pending interrupt. */
1668 list_add_tail(&work->list, &iucv_work_queue);
1669 schedule_work(&iucv_work);
1670 } else {
1671 /* The other interrupts. */
1672 list_add_tail(&work->list, &iucv_task_queue);
1673 tasklet_schedule(&iucv_tasklet);
1674 }
1675 spin_unlock(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001676}
1677
1678/**
1679 * iucv_init
1680 *
1681 * Allocates and initializes various data structures.
1682 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001683static int __init iucv_init(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001684{
1685 int rc;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001686 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001687
1688 if (!MACHINE_IS_VM) {
1689 rc = -EPROTONOSUPPORT;
1690 goto out;
1691 }
1692 rc = iucv_query_maxconn();
1693 if (rc)
1694 goto out;
Heiko Carstensda99f052007-05-04 12:23:27 -07001695 rc = register_external_interrupt(0x4000, iucv_external_interrupt);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001696 if (rc)
1697 goto out;
Mark McLoughlin035da162008-12-15 12:58:29 +00001698 iucv_root = root_device_register("iucv");
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001699 if (IS_ERR(iucv_root)) {
1700 rc = PTR_ERR(iucv_root);
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001701 goto out_int;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001702 }
Christoph Lameter70cf50352007-11-20 11:13:38 +01001703
1704 for_each_online_cpu(cpu) {
1705 /* Note: GFP_DMA used to get memory below 2G */
1706 iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
1707 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1708 if (!iucv_irq_data[cpu]) {
1709 rc = -ENOMEM;
1710 goto out_free;
1711 }
1712
1713 /* Allocate parameter blocks. */
1714 iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
1715 GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
1716 if (!iucv_param[cpu]) {
1717 rc = -ENOMEM;
1718 goto out_free;
1719 }
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001720 }
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001721 rc = register_hotcpu_notifier(&iucv_cpu_notifier);
1722 if (rc)
1723 goto out_free;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001724 ASCEBC(iucv_error_no_listener, 16);
1725 ASCEBC(iucv_error_no_memory, 16);
1726 ASCEBC(iucv_error_pathid, 16);
1727 iucv_available = 1;
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001728 rc = bus_register(&iucv_bus);
1729 if (rc)
1730 goto out_cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001731 return 0;
1732
Cornelia Huck2d7bf362008-04-10 02:12:45 -07001733out_cpu:
1734 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001735out_free:
1736 for_each_possible_cpu(cpu) {
1737 kfree(iucv_param[cpu]);
1738 iucv_param[cpu] = NULL;
1739 kfree(iucv_irq_data[cpu]);
1740 iucv_irq_data[cpu] = NULL;
1741 }
Mark McLoughlin035da162008-12-15 12:58:29 +00001742 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001743out_int:
1744 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1745out:
1746 return rc;
1747}
1748
1749/**
1750 * iucv_exit
1751 *
1752 * Frees everything allocated from iucv_init.
1753 */
Heiko Carstensda99f052007-05-04 12:23:27 -07001754static void __exit iucv_exit(void)
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001755{
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001756 struct iucv_irq_list *p, *n;
Christoph Lameter70cf50352007-11-20 11:13:38 +01001757 int cpu;
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001758
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001759 spin_lock_irq(&iucv_queue_lock);
1760 list_for_each_entry_safe(p, n, &iucv_task_queue, list)
1761 kfree(p);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001762 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1763 kfree(p);
Martin Schwidefsky04b090d2007-04-28 23:03:59 -07001764 spin_unlock_irq(&iucv_queue_lock);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001765 unregister_hotcpu_notifier(&iucv_cpu_notifier);
Christoph Lameter70cf50352007-11-20 11:13:38 +01001766 for_each_possible_cpu(cpu) {
1767 kfree(iucv_param[cpu]);
1768 iucv_param[cpu] = NULL;
1769 kfree(iucv_irq_data[cpu]);
1770 iucv_irq_data[cpu] = NULL;
1771 }
Mark McLoughlin035da162008-12-15 12:58:29 +00001772 root_device_unregister(iucv_root);
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001773 bus_unregister(&iucv_bus);
1774 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1775}
1776
1777subsys_initcall(iucv_init);
1778module_exit(iucv_exit);
1779
Martin Schwidefsky2356f4c2007-02-08 13:37:42 -08001780MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1781MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1782MODULE_LICENSE("GPL");