Root/
1 | /* |
2 | * IUCV base infrastructure. |
3 | * |
4 | * Copyright IBM Corp. 2001, 2009 |
5 | * |
6 | * Author(s): |
7 | * Original source: |
8 | * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 |
9 | * Xenia Tkatschow (xenia@us.ibm.com) |
10 | * 2Gb awareness and general cleanup: |
11 | * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) |
12 | * Rewritten for af_iucv: |
13 | * Martin Schwidefsky <schwidefsky@de.ibm.com> |
14 | * PM functions: |
15 | * Ursula Braun (ursula.braun@de.ibm.com) |
16 | * |
17 | * Documentation used: |
18 | * The original source |
19 | * CP Programming Service, IBM document # SC24-5760 |
20 | * |
21 | * This program is free software; you can redistribute it and/or modify |
22 | * it under the terms of the GNU General Public License as published by |
23 | * the Free Software Foundation; either version 2, or (at your option) |
24 | * any later version. |
25 | * |
26 | * This program is distributed in the hope that it will be useful, |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
29 | * GNU General Public License for more details. |
30 | * |
31 | * You should have received a copy of the GNU General Public License |
32 | * along with this program; if not, write to the Free Software |
33 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
34 | */ |
35 | |
36 | #define KMSG_COMPONENT "iucv" |
37 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
38 | |
39 | #include <linux/kernel_stat.h> |
40 | #include <linux/module.h> |
41 | #include <linux/moduleparam.h> |
42 | #include <linux/spinlock.h> |
43 | #include <linux/kernel.h> |
44 | #include <linux/slab.h> |
45 | #include <linux/init.h> |
46 | #include <linux/interrupt.h> |
47 | #include <linux/list.h> |
48 | #include <linux/errno.h> |
49 | #include <linux/err.h> |
50 | #include <linux/device.h> |
51 | #include <linux/cpu.h> |
52 | #include <linux/reboot.h> |
53 | #include <net/iucv/iucv.h> |
54 | #include <linux/atomic.h> |
55 | #include <asm/ebcdic.h> |
56 | #include <asm/io.h> |
57 | #include <asm/irq.h> |
58 | #include <asm/smp.h> |
59 | |
60 | /* |
61 | * FLAGS: |
62 | * All flags are defined in the field IPFLAGS1 of each function |
63 | * and can be found in CP Programming Services. |
64 | * IPSRCCLS - Indicates you have specified a source class. |
65 | * IPTRGCLS - Indicates you have specified a target class. |
66 | * IPFGPID - Indicates you have specified a pathid. |
67 | * IPFGMID - Indicates you have specified a message ID. |
68 | * IPNORPY - Indicates a one-way message. No reply expected. |
69 | * IPALL - Indicates that all paths are affected. |
70 | */ |
71 | #define IUCV_IPSRCCLS 0x01 |
72 | #define IUCV_IPTRGCLS 0x01 |
73 | #define IUCV_IPFGPID 0x02 |
74 | #define IUCV_IPFGMID 0x04 |
75 | #define IUCV_IPNORPY 0x10 |
76 | #define IUCV_IPALL 0x80 |
77 | |
78 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
79 | { |
80 | return 0; |
81 | } |
82 | |
83 | enum iucv_pm_states { |
84 | IUCV_PM_INITIAL = 0, |
85 | IUCV_PM_FREEZING = 1, |
86 | IUCV_PM_THAWING = 2, |
87 | IUCV_PM_RESTORING = 3, |
88 | }; |
89 | static enum iucv_pm_states iucv_pm_state; |
90 | |
91 | static int iucv_pm_prepare(struct device *); |
92 | static void iucv_pm_complete(struct device *); |
93 | static int iucv_pm_freeze(struct device *); |
94 | static int iucv_pm_thaw(struct device *); |
95 | static int iucv_pm_restore(struct device *); |
96 | |
97 | static const struct dev_pm_ops iucv_pm_ops = { |
98 | .prepare = iucv_pm_prepare, |
99 | .complete = iucv_pm_complete, |
100 | .freeze = iucv_pm_freeze, |
101 | .thaw = iucv_pm_thaw, |
102 | .restore = iucv_pm_restore, |
103 | }; |
104 | |
105 | struct bus_type iucv_bus = { |
106 | .name = "iucv", |
107 | .match = iucv_bus_match, |
108 | .pm = &iucv_pm_ops, |
109 | }; |
110 | EXPORT_SYMBOL(iucv_bus); |
111 | |
112 | struct device *iucv_root; |
113 | EXPORT_SYMBOL(iucv_root); |
114 | |
115 | static int iucv_available; |
116 | |
117 | /* General IUCV interrupt structure */ |
118 | struct iucv_irq_data { |
119 | u16 ippathid; |
120 | u8 ipflags1; |
121 | u8 iptype; |
122 | u32 res2[8]; |
123 | }; |
124 | |
125 | struct iucv_irq_list { |
126 | struct list_head list; |
127 | struct iucv_irq_data data; |
128 | }; |
129 | |
130 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
131 | static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE }; |
132 | static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE }; |
133 | |
134 | /* |
135 | * Queue of interrupt buffers lock for delivery via the tasklet |
136 | * (fast but can't call smp_call_function). |
137 | */ |
138 | static LIST_HEAD(iucv_task_queue); |
139 | |
140 | /* |
141 | * The tasklet for fast delivery of iucv interrupts. |
142 | */ |
143 | static void iucv_tasklet_fn(unsigned long); |
144 | static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0); |
145 | |
146 | /* |
147 | * Queue of interrupt buffers for delivery via a work queue |
148 | * (slower but can call smp_call_function). |
149 | */ |
150 | static LIST_HEAD(iucv_work_queue); |
151 | |
152 | /* |
153 | * The work element to deliver path pending interrupts. |
154 | */ |
155 | static void iucv_work_fn(struct work_struct *work); |
156 | static DECLARE_WORK(iucv_work, iucv_work_fn); |
157 | |
158 | /* |
159 | * Spinlock protecting task and work queue. |
160 | */ |
161 | static DEFINE_SPINLOCK(iucv_queue_lock); |
162 | |
163 | enum iucv_command_codes { |
164 | IUCV_QUERY = 0, |
165 | IUCV_RETRIEVE_BUFFER = 2, |
166 | IUCV_SEND = 4, |
167 | IUCV_RECEIVE = 5, |
168 | IUCV_REPLY = 6, |
169 | IUCV_REJECT = 8, |
170 | IUCV_PURGE = 9, |
171 | IUCV_ACCEPT = 10, |
172 | IUCV_CONNECT = 11, |
173 | IUCV_DECLARE_BUFFER = 12, |
174 | IUCV_QUIESCE = 13, |
175 | IUCV_RESUME = 14, |
176 | IUCV_SEVER = 15, |
177 | IUCV_SETMASK = 16, |
178 | IUCV_SETCONTROLMASK = 17, |
179 | }; |
180 | |
181 | /* |
182 | * Error messages that are used with the iucv_sever function. They get |
183 | * converted to EBCDIC. |
184 | */ |
185 | static char iucv_error_no_listener[16] = "NO LISTENER"; |
186 | static char iucv_error_no_memory[16] = "NO MEMORY"; |
187 | static char iucv_error_pathid[16] = "INVALID PATHID"; |
188 | |
189 | /* |
190 | * iucv_handler_list: List of registered handlers. |
191 | */ |
192 | static LIST_HEAD(iucv_handler_list); |
193 | |
194 | /* |
195 | * iucv_path_table: an array of iucv_path structures. |
196 | */ |
197 | static struct iucv_path **iucv_path_table; |
198 | static unsigned long iucv_max_pathid; |
199 | |
200 | /* |
201 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table |
202 | */ |
203 | static DEFINE_SPINLOCK(iucv_table_lock); |
204 | |
205 | /* |
206 | * iucv_active_cpu: contains the number of the cpu executing the tasklet |
207 | * or the work handler. Needed for iucv_path_sever called from tasklet. |
208 | */ |
209 | static int iucv_active_cpu = -1; |
210 | |
211 | /* |
212 | * Mutex and wait queue for iucv_register/iucv_unregister. |
213 | */ |
214 | static DEFINE_MUTEX(iucv_register_mutex); |
215 | |
216 | /* |
217 | * Counter for number of non-smp capable handlers. |
218 | */ |
219 | static int iucv_nonsmp_handler; |
220 | |
221 | /* |
222 | * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, |
223 | * iucv_path_quiesce and iucv_path_sever. |
224 | */ |
225 | struct iucv_cmd_control { |
226 | u16 ippathid; |
227 | u8 ipflags1; |
228 | u8 iprcode; |
229 | u16 ipmsglim; |
230 | u16 res1; |
231 | u8 ipvmid[8]; |
232 | u8 ipuser[16]; |
233 | u8 iptarget[8]; |
234 | } __attribute__ ((packed,aligned(8))); |
235 | |
236 | /* |
237 | * Data in parameter list iucv structure. Used by iucv_message_send, |
238 | * iucv_message_send2way and iucv_message_reply. |
239 | */ |
240 | struct iucv_cmd_dpl { |
241 | u16 ippathid; |
242 | u8 ipflags1; |
243 | u8 iprcode; |
244 | u32 ipmsgid; |
245 | u32 iptrgcls; |
246 | u8 iprmmsg[8]; |
247 | u32 ipsrccls; |
248 | u32 ipmsgtag; |
249 | u32 ipbfadr2; |
250 | u32 ipbfln2f; |
251 | u32 res; |
252 | } __attribute__ ((packed,aligned(8))); |
253 | |
254 | /* |
255 | * Data in buffer iucv structure. Used by iucv_message_receive, |
256 | * iucv_message_reject, iucv_message_send, iucv_message_send2way |
257 | * and iucv_declare_cpu. |
258 | */ |
259 | struct iucv_cmd_db { |
260 | u16 ippathid; |
261 | u8 ipflags1; |
262 | u8 iprcode; |
263 | u32 ipmsgid; |
264 | u32 iptrgcls; |
265 | u32 ipbfadr1; |
266 | u32 ipbfln1f; |
267 | u32 ipsrccls; |
268 | u32 ipmsgtag; |
269 | u32 ipbfadr2; |
270 | u32 ipbfln2f; |
271 | u32 res; |
272 | } __attribute__ ((packed,aligned(8))); |
273 | |
274 | /* |
275 | * Purge message iucv structure. Used by iucv_message_purge. |
276 | */ |
277 | struct iucv_cmd_purge { |
278 | u16 ippathid; |
279 | u8 ipflags1; |
280 | u8 iprcode; |
281 | u32 ipmsgid; |
282 | u8 ipaudit[3]; |
283 | u8 res1[5]; |
284 | u32 res2; |
285 | u32 ipsrccls; |
286 | u32 ipmsgtag; |
287 | u32 res3[3]; |
288 | } __attribute__ ((packed,aligned(8))); |
289 | |
290 | /* |
291 | * Set mask iucv structure. Used by iucv_enable_cpu. |
292 | */ |
293 | struct iucv_cmd_set_mask { |
294 | u8 ipmask; |
295 | u8 res1[2]; |
296 | u8 iprcode; |
297 | u32 res2[9]; |
298 | } __attribute__ ((packed,aligned(8))); |
299 | |
300 | union iucv_param { |
301 | struct iucv_cmd_control ctrl; |
302 | struct iucv_cmd_dpl dpl; |
303 | struct iucv_cmd_db db; |
304 | struct iucv_cmd_purge purge; |
305 | struct iucv_cmd_set_mask set_mask; |
306 | }; |
307 | |
308 | /* |
309 | * Anchor for per-cpu IUCV command parameter block. |
310 | */ |
311 | static union iucv_param *iucv_param[NR_CPUS]; |
312 | static union iucv_param *iucv_param_irq[NR_CPUS]; |
313 | |
314 | /** |
315 | * iucv_call_b2f0 |
316 | * @code: identifier of IUCV call to CP. |
317 | * @parm: pointer to a struct iucv_parm block |
318 | * |
319 | * Calls CP to execute IUCV commands. |
320 | * |
321 | * Returns the result of the CP IUCV call. |
322 | */ |
323 | static inline int iucv_call_b2f0(int command, union iucv_param *parm) |
324 | { |
325 | register unsigned long reg0 asm ("0"); |
326 | register unsigned long reg1 asm ("1"); |
327 | int ccode; |
328 | |
329 | reg0 = command; |
330 | reg1 = virt_to_phys(parm); |
331 | asm volatile( |
332 | " .long 0xb2f01000\n" |
333 | " ipm %0\n" |
334 | " srl %0,28\n" |
335 | : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1) |
336 | : "m" (*parm) : "cc"); |
337 | return (ccode == 1) ? parm->ctrl.iprcode : ccode; |
338 | } |
339 | |
340 | /** |
341 | * iucv_query_maxconn |
342 | * |
343 | * Determines the maximum number of connections that may be established. |
344 | * |
345 | * Returns the maximum number of connections or -EPERM is IUCV is not |
346 | * available. |
347 | */ |
348 | static int iucv_query_maxconn(void) |
349 | { |
350 | register unsigned long reg0 asm ("0"); |
351 | register unsigned long reg1 asm ("1"); |
352 | void *param; |
353 | int ccode; |
354 | |
355 | param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA); |
356 | if (!param) |
357 | return -ENOMEM; |
358 | reg0 = IUCV_QUERY; |
359 | reg1 = (unsigned long) param; |
360 | asm volatile ( |
361 | " .long 0xb2f01000\n" |
362 | " ipm %0\n" |
363 | " srl %0,28\n" |
364 | : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc"); |
365 | if (ccode == 0) |
366 | iucv_max_pathid = reg1; |
367 | kfree(param); |
368 | return ccode ? -EPERM : 0; |
369 | } |
370 | |
371 | /** |
372 | * iucv_allow_cpu |
373 | * @data: unused |
374 | * |
375 | * Allow iucv interrupts on this cpu. |
376 | */ |
377 | static void iucv_allow_cpu(void *data) |
378 | { |
379 | int cpu = smp_processor_id(); |
380 | union iucv_param *parm; |
381 | |
382 | /* |
383 | * Enable all iucv interrupts. |
384 | * ipmask contains bits for the different interrupts |
385 | * 0x80 - Flag to allow nonpriority message pending interrupts |
386 | * 0x40 - Flag to allow priority message pending interrupts |
387 | * 0x20 - Flag to allow nonpriority message completion interrupts |
388 | * 0x10 - Flag to allow priority message completion interrupts |
389 | * 0x08 - Flag to allow IUCV control interrupts |
390 | */ |
391 | parm = iucv_param_irq[cpu]; |
392 | memset(parm, 0, sizeof(union iucv_param)); |
393 | parm->set_mask.ipmask = 0xf8; |
394 | iucv_call_b2f0(IUCV_SETMASK, parm); |
395 | |
396 | /* |
397 | * Enable all iucv control interrupts. |
398 | * ipmask contains bits for the different interrupts |
399 | * 0x80 - Flag to allow pending connections interrupts |
400 | * 0x40 - Flag to allow connection complete interrupts |
401 | * 0x20 - Flag to allow connection severed interrupts |
402 | * 0x10 - Flag to allow connection quiesced interrupts |
403 | * 0x08 - Flag to allow connection resumed interrupts |
404 | */ |
405 | memset(parm, 0, sizeof(union iucv_param)); |
406 | parm->set_mask.ipmask = 0xf8; |
407 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); |
408 | /* Set indication that iucv interrupts are allowed for this cpu. */ |
409 | cpumask_set_cpu(cpu, &iucv_irq_cpumask); |
410 | } |
411 | |
412 | /** |
413 | * iucv_block_cpu |
414 | * @data: unused |
415 | * |
416 | * Block iucv interrupts on this cpu. |
417 | */ |
418 | static void iucv_block_cpu(void *data) |
419 | { |
420 | int cpu = smp_processor_id(); |
421 | union iucv_param *parm; |
422 | |
423 | /* Disable all iucv interrupts. */ |
424 | parm = iucv_param_irq[cpu]; |
425 | memset(parm, 0, sizeof(union iucv_param)); |
426 | iucv_call_b2f0(IUCV_SETMASK, parm); |
427 | |
428 | /* Clear indication that iucv interrupts are allowed for this cpu. */ |
429 | cpumask_clear_cpu(cpu, &iucv_irq_cpumask); |
430 | } |
431 | |
432 | /** |
433 | * iucv_block_cpu_almost |
434 | * @data: unused |
435 | * |
436 | * Allow connection-severed interrupts only on this cpu. |
437 | */ |
438 | static void iucv_block_cpu_almost(void *data) |
439 | { |
440 | int cpu = smp_processor_id(); |
441 | union iucv_param *parm; |
442 | |
443 | /* Allow iucv control interrupts only */ |
444 | parm = iucv_param_irq[cpu]; |
445 | memset(parm, 0, sizeof(union iucv_param)); |
446 | parm->set_mask.ipmask = 0x08; |
447 | iucv_call_b2f0(IUCV_SETMASK, parm); |
448 | /* Allow iucv-severed interrupt only */ |
449 | memset(parm, 0, sizeof(union iucv_param)); |
450 | parm->set_mask.ipmask = 0x20; |
451 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); |
452 | |
453 | /* Clear indication that iucv interrupts are allowed for this cpu. */ |
454 | cpumask_clear_cpu(cpu, &iucv_irq_cpumask); |
455 | } |
456 | |
457 | /** |
458 | * iucv_declare_cpu |
459 | * @data: unused |
460 | * |
461 | * Declare a interrupt buffer on this cpu. |
462 | */ |
463 | static void iucv_declare_cpu(void *data) |
464 | { |
465 | int cpu = smp_processor_id(); |
466 | union iucv_param *parm; |
467 | int rc; |
468 | |
469 | if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) |
470 | return; |
471 | |
472 | /* Declare interrupt buffer. */ |
473 | parm = iucv_param_irq[cpu]; |
474 | memset(parm, 0, sizeof(union iucv_param)); |
475 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
476 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
477 | if (rc) { |
478 | char *err = "Unknown"; |
479 | switch (rc) { |
480 | case 0x03: |
481 | err = "Directory error"; |
482 | break; |
483 | case 0x0a: |
484 | err = "Invalid length"; |
485 | break; |
486 | case 0x13: |
487 | err = "Buffer already exists"; |
488 | break; |
489 | case 0x3e: |
490 | err = "Buffer overlap"; |
491 | break; |
492 | case 0x5c: |
493 | err = "Paging or storage error"; |
494 | break; |
495 | } |
496 | pr_warning("Defining an interrupt buffer on CPU %i" |
497 | " failed with 0x%02x (%s)\n", cpu, rc, err); |
498 | return; |
499 | } |
500 | |
501 | /* Set indication that an iucv buffer exists for this cpu. */ |
502 | cpumask_set_cpu(cpu, &iucv_buffer_cpumask); |
503 | |
504 | if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask)) |
505 | /* Enable iucv interrupts on this cpu. */ |
506 | iucv_allow_cpu(NULL); |
507 | else |
508 | /* Disable iucv interrupts on this cpu. */ |
509 | iucv_block_cpu(NULL); |
510 | } |
511 | |
512 | /** |
513 | * iucv_retrieve_cpu |
514 | * @data: unused |
515 | * |
516 | * Retrieve interrupt buffer on this cpu. |
517 | */ |
518 | static void iucv_retrieve_cpu(void *data) |
519 | { |
520 | int cpu = smp_processor_id(); |
521 | union iucv_param *parm; |
522 | |
523 | if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) |
524 | return; |
525 | |
526 | /* Block iucv interrupts. */ |
527 | iucv_block_cpu(NULL); |
528 | |
529 | /* Retrieve interrupt buffer. */ |
530 | parm = iucv_param_irq[cpu]; |
531 | iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); |
532 | |
533 | /* Clear indication that an iucv buffer exists for this cpu. */ |
534 | cpumask_clear_cpu(cpu, &iucv_buffer_cpumask); |
535 | } |
536 | |
537 | /** |
538 | * iucv_setmask_smp |
539 | * |
540 | * Allow iucv interrupts on all cpus. |
541 | */ |
542 | static void iucv_setmask_mp(void) |
543 | { |
544 | int cpu; |
545 | |
546 | get_online_cpus(); |
547 | for_each_online_cpu(cpu) |
548 | /* Enable all cpus with a declared buffer. */ |
549 | if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) && |
550 | !cpumask_test_cpu(cpu, &iucv_irq_cpumask)) |
551 | smp_call_function_single(cpu, iucv_allow_cpu, |
552 | NULL, 1); |
553 | put_online_cpus(); |
554 | } |
555 | |
556 | /** |
557 | * iucv_setmask_up |
558 | * |
559 | * Allow iucv interrupts on a single cpu. |
560 | */ |
561 | static void iucv_setmask_up(void) |
562 | { |
563 | cpumask_t cpumask; |
564 | int cpu; |
565 | |
566 | /* Disable all cpu but the first in cpu_irq_cpumask. */ |
567 | cpumask_copy(&cpumask, &iucv_irq_cpumask); |
568 | cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask); |
569 | for_each_cpu(cpu, &cpumask) |
570 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
571 | } |
572 | |
573 | /** |
574 | * iucv_enable |
575 | * |
576 | * This function makes iucv ready for use. It allocates the pathid |
577 | * table, declares an iucv interrupt buffer and enables the iucv |
578 | * interrupts. Called when the first user has registered an iucv |
579 | * handler. |
580 | */ |
581 | static int iucv_enable(void) |
582 | { |
583 | size_t alloc_size; |
584 | int cpu, rc; |
585 | |
586 | get_online_cpus(); |
587 | rc = -ENOMEM; |
588 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); |
589 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); |
590 | if (!iucv_path_table) |
591 | goto out; |
592 | /* Declare per cpu buffers. */ |
593 | rc = -EIO; |
594 | for_each_online_cpu(cpu) |
595 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
596 | if (cpumask_empty(&iucv_buffer_cpumask)) |
597 | /* No cpu could declare an iucv buffer. */ |
598 | goto out; |
599 | put_online_cpus(); |
600 | return 0; |
601 | out: |
602 | kfree(iucv_path_table); |
603 | iucv_path_table = NULL; |
604 | put_online_cpus(); |
605 | return rc; |
606 | } |
607 | |
608 | /** |
609 | * iucv_disable |
610 | * |
611 | * This function shuts down iucv. It disables iucv interrupts, retrieves |
612 | * the iucv interrupt buffer and frees the pathid table. Called after the |
613 | * last user unregister its iucv handler. |
614 | */ |
615 | static void iucv_disable(void) |
616 | { |
617 | get_online_cpus(); |
618 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
619 | kfree(iucv_path_table); |
620 | iucv_path_table = NULL; |
621 | put_online_cpus(); |
622 | } |
623 | |
624 | static int __cpuinit iucv_cpu_notify(struct notifier_block *self, |
625 | unsigned long action, void *hcpu) |
626 | { |
627 | cpumask_t cpumask; |
628 | long cpu = (long) hcpu; |
629 | |
630 | switch (action) { |
631 | case CPU_UP_PREPARE: |
632 | case CPU_UP_PREPARE_FROZEN: |
633 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), |
634 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
635 | if (!iucv_irq_data[cpu]) |
636 | return notifier_from_errno(-ENOMEM); |
637 | |
638 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
639 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
640 | if (!iucv_param[cpu]) { |
641 | kfree(iucv_irq_data[cpu]); |
642 | iucv_irq_data[cpu] = NULL; |
643 | return notifier_from_errno(-ENOMEM); |
644 | } |
645 | iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), |
646 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
647 | if (!iucv_param_irq[cpu]) { |
648 | kfree(iucv_param[cpu]); |
649 | iucv_param[cpu] = NULL; |
650 | kfree(iucv_irq_data[cpu]); |
651 | iucv_irq_data[cpu] = NULL; |
652 | return notifier_from_errno(-ENOMEM); |
653 | } |
654 | break; |
655 | case CPU_UP_CANCELED: |
656 | case CPU_UP_CANCELED_FROZEN: |
657 | case CPU_DEAD: |
658 | case CPU_DEAD_FROZEN: |
659 | kfree(iucv_param_irq[cpu]); |
660 | iucv_param_irq[cpu] = NULL; |
661 | kfree(iucv_param[cpu]); |
662 | iucv_param[cpu] = NULL; |
663 | kfree(iucv_irq_data[cpu]); |
664 | iucv_irq_data[cpu] = NULL; |
665 | break; |
666 | case CPU_ONLINE: |
667 | case CPU_ONLINE_FROZEN: |
668 | case CPU_DOWN_FAILED: |
669 | case CPU_DOWN_FAILED_FROZEN: |
670 | if (!iucv_path_table) |
671 | break; |
672 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
673 | break; |
674 | case CPU_DOWN_PREPARE: |
675 | case CPU_DOWN_PREPARE_FROZEN: |
676 | if (!iucv_path_table) |
677 | break; |
678 | cpumask_copy(&cpumask, &iucv_buffer_cpumask); |
679 | cpumask_clear_cpu(cpu, &cpumask); |
680 | if (cpumask_empty(&cpumask)) |
681 | /* Can't offline last IUCV enabled cpu. */ |
682 | return notifier_from_errno(-EINVAL); |
683 | smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); |
684 | if (cpumask_empty(&iucv_irq_cpumask)) |
685 | smp_call_function_single( |
686 | cpumask_first(&iucv_buffer_cpumask), |
687 | iucv_allow_cpu, NULL, 1); |
688 | break; |
689 | } |
690 | return NOTIFY_OK; |
691 | } |
692 | |
693 | static struct notifier_block __refdata iucv_cpu_notifier = { |
694 | .notifier_call = iucv_cpu_notify, |
695 | }; |
696 | |
697 | /** |
698 | * iucv_sever_pathid |
699 | * @pathid: path identification number. |
700 | * @userdata: 16-bytes of user data. |
701 | * |
702 | * Sever an iucv path to free up the pathid. Used internally. |
703 | */ |
704 | static int iucv_sever_pathid(u16 pathid, u8 userdata[16]) |
705 | { |
706 | union iucv_param *parm; |
707 | |
708 | parm = iucv_param_irq[smp_processor_id()]; |
709 | memset(parm, 0, sizeof(union iucv_param)); |
710 | if (userdata) |
711 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
712 | parm->ctrl.ippathid = pathid; |
713 | return iucv_call_b2f0(IUCV_SEVER, parm); |
714 | } |
715 | |
716 | /** |
717 | * __iucv_cleanup_queue |
718 | * @dummy: unused dummy argument |
719 | * |
720 | * Nop function called via smp_call_function to force work items from |
721 | * pending external iucv interrupts to the work queue. |
722 | */ |
723 | static void __iucv_cleanup_queue(void *dummy) |
724 | { |
725 | } |
726 | |
727 | /** |
728 | * iucv_cleanup_queue |
729 | * |
730 | * Function called after a path has been severed to find all remaining |
731 | * work items for the now stale pathid. The caller needs to hold the |
732 | * iucv_table_lock. |
733 | */ |
734 | static void iucv_cleanup_queue(void) |
735 | { |
736 | struct iucv_irq_list *p, *n; |
737 | |
738 | /* |
739 | * When a path is severed, the pathid can be reused immediately |
740 | * on a iucv connect or a connection pending interrupt. Remove |
741 | * all entries from the task queue that refer to a stale pathid |
742 | * (iucv_path_table[ix] == NULL). Only then do the iucv connect |
743 | * or deliver the connection pending interrupt. To get all the |
744 | * pending interrupts force them to the work queue by calling |
745 | * an empty function on all cpus. |
746 | */ |
747 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
748 | spin_lock_irq(&iucv_queue_lock); |
749 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) { |
750 | /* Remove stale work items from the task queue. */ |
751 | if (iucv_path_table[p->data.ippathid] == NULL) { |
752 | list_del(&p->list); |
753 | kfree(p); |
754 | } |
755 | } |
756 | spin_unlock_irq(&iucv_queue_lock); |
757 | } |
758 | |
759 | /** |
760 | * iucv_register: |
761 | * @handler: address of iucv handler structure |
762 | * @smp: != 0 indicates that the handler can deal with out of order messages |
763 | * |
764 | * Registers a driver with IUCV. |
765 | * |
766 | * Returns 0 on success, -ENOMEM if the memory allocation for the pathid |
767 | * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. |
768 | */ |
769 | int iucv_register(struct iucv_handler *handler, int smp) |
770 | { |
771 | int rc; |
772 | |
773 | if (!iucv_available) |
774 | return -ENOSYS; |
775 | mutex_lock(&iucv_register_mutex); |
776 | if (!smp) |
777 | iucv_nonsmp_handler++; |
778 | if (list_empty(&iucv_handler_list)) { |
779 | rc = iucv_enable(); |
780 | if (rc) |
781 | goto out_mutex; |
782 | } else if (!smp && iucv_nonsmp_handler == 1) |
783 | iucv_setmask_up(); |
784 | INIT_LIST_HEAD(&handler->paths); |
785 | |
786 | spin_lock_bh(&iucv_table_lock); |
787 | list_add_tail(&handler->list, &iucv_handler_list); |
788 | spin_unlock_bh(&iucv_table_lock); |
789 | rc = 0; |
790 | out_mutex: |
791 | mutex_unlock(&iucv_register_mutex); |
792 | return rc; |
793 | } |
794 | EXPORT_SYMBOL(iucv_register); |
795 | |
796 | /** |
797 | * iucv_unregister |
798 | * @handler: address of iucv handler structure |
799 | * @smp: != 0 indicates that the handler can deal with out of order messages |
800 | * |
801 | * Unregister driver from IUCV. |
802 | */ |
803 | void iucv_unregister(struct iucv_handler *handler, int smp) |
804 | { |
805 | struct iucv_path *p, *n; |
806 | |
807 | mutex_lock(&iucv_register_mutex); |
808 | spin_lock_bh(&iucv_table_lock); |
809 | /* Remove handler from the iucv_handler_list. */ |
810 | list_del_init(&handler->list); |
811 | /* Sever all pathids still referring to the handler. */ |
812 | list_for_each_entry_safe(p, n, &handler->paths, list) { |
813 | iucv_sever_pathid(p->pathid, NULL); |
814 | iucv_path_table[p->pathid] = NULL; |
815 | list_del(&p->list); |
816 | iucv_path_free(p); |
817 | } |
818 | spin_unlock_bh(&iucv_table_lock); |
819 | if (!smp) |
820 | iucv_nonsmp_handler--; |
821 | if (list_empty(&iucv_handler_list)) |
822 | iucv_disable(); |
823 | else if (!smp && iucv_nonsmp_handler == 0) |
824 | iucv_setmask_mp(); |
825 | mutex_unlock(&iucv_register_mutex); |
826 | } |
827 | EXPORT_SYMBOL(iucv_unregister); |
828 | |
829 | static int iucv_reboot_event(struct notifier_block *this, |
830 | unsigned long event, void *ptr) |
831 | { |
832 | int i; |
833 | |
834 | get_online_cpus(); |
835 | on_each_cpu(iucv_block_cpu, NULL, 1); |
836 | preempt_disable(); |
837 | for (i = 0; i < iucv_max_pathid; i++) { |
838 | if (iucv_path_table[i]) |
839 | iucv_sever_pathid(i, NULL); |
840 | } |
841 | preempt_enable(); |
842 | put_online_cpus(); |
843 | iucv_disable(); |
844 | return NOTIFY_DONE; |
845 | } |
846 | |
847 | static struct notifier_block iucv_reboot_notifier = { |
848 | .notifier_call = iucv_reboot_event, |
849 | }; |
850 | |
851 | /** |
852 | * iucv_path_accept |
853 | * @path: address of iucv path structure |
854 | * @handler: address of iucv handler structure |
855 | * @userdata: 16 bytes of data reflected to the communication partner |
856 | * @private: private data passed to interrupt handlers for this path |
857 | * |
858 | * This function is issued after the user received a connection pending |
859 | * external interrupt and now wishes to complete the IUCV communication path. |
860 | * |
861 | * Returns the result of the CP IUCV call. |
862 | */ |
863 | int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, |
864 | u8 userdata[16], void *private) |
865 | { |
866 | union iucv_param *parm; |
867 | int rc; |
868 | |
869 | local_bh_disable(); |
870 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
871 | rc = -EIO; |
872 | goto out; |
873 | } |
874 | /* Prepare parameter block. */ |
875 | parm = iucv_param[smp_processor_id()]; |
876 | memset(parm, 0, sizeof(union iucv_param)); |
877 | parm->ctrl.ippathid = path->pathid; |
878 | parm->ctrl.ipmsglim = path->msglim; |
879 | if (userdata) |
880 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
881 | parm->ctrl.ipflags1 = path->flags; |
882 | |
883 | rc = iucv_call_b2f0(IUCV_ACCEPT, parm); |
884 | if (!rc) { |
885 | path->private = private; |
886 | path->msglim = parm->ctrl.ipmsglim; |
887 | path->flags = parm->ctrl.ipflags1; |
888 | } |
889 | out: |
890 | local_bh_enable(); |
891 | return rc; |
892 | } |
893 | EXPORT_SYMBOL(iucv_path_accept); |
894 | |
895 | /** |
896 | * iucv_path_connect |
897 | * @path: address of iucv path structure |
898 | * @handler: address of iucv handler structure |
899 | * @userid: 8-byte user identification |
900 | * @system: 8-byte target system identification |
901 | * @userdata: 16 bytes of data reflected to the communication partner |
902 | * @private: private data passed to interrupt handlers for this path |
903 | * |
904 | * This function establishes an IUCV path. Although the connect may complete |
905 | * successfully, you are not able to use the path until you receive an IUCV |
906 | * Connection Complete external interrupt. |
907 | * |
908 | * Returns the result of the CP IUCV call. |
909 | */ |
910 | int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, |
911 | u8 userid[8], u8 system[8], u8 userdata[16], |
912 | void *private) |
913 | { |
914 | union iucv_param *parm; |
915 | int rc; |
916 | |
917 | spin_lock_bh(&iucv_table_lock); |
918 | iucv_cleanup_queue(); |
919 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
920 | rc = -EIO; |
921 | goto out; |
922 | } |
923 | parm = iucv_param[smp_processor_id()]; |
924 | memset(parm, 0, sizeof(union iucv_param)); |
925 | parm->ctrl.ipmsglim = path->msglim; |
926 | parm->ctrl.ipflags1 = path->flags; |
927 | if (userid) { |
928 | memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); |
929 | ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); |
930 | EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); |
931 | } |
932 | if (system) { |
933 | memcpy(parm->ctrl.iptarget, system, |
934 | sizeof(parm->ctrl.iptarget)); |
935 | ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); |
936 | EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); |
937 | } |
938 | if (userdata) |
939 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
940 | |
941 | rc = iucv_call_b2f0(IUCV_CONNECT, parm); |
942 | if (!rc) { |
943 | if (parm->ctrl.ippathid < iucv_max_pathid) { |
944 | path->pathid = parm->ctrl.ippathid; |
945 | path->msglim = parm->ctrl.ipmsglim; |
946 | path->flags = parm->ctrl.ipflags1; |
947 | path->handler = handler; |
948 | path->private = private; |
949 | list_add_tail(&path->list, &handler->paths); |
950 | iucv_path_table[path->pathid] = path; |
951 | } else { |
952 | iucv_sever_pathid(parm->ctrl.ippathid, |
953 | iucv_error_pathid); |
954 | rc = -EIO; |
955 | } |
956 | } |
957 | out: |
958 | spin_unlock_bh(&iucv_table_lock); |
959 | return rc; |
960 | } |
961 | EXPORT_SYMBOL(iucv_path_connect); |
962 | |
963 | /** |
964 | * iucv_path_quiesce: |
965 | * @path: address of iucv path structure |
966 | * @userdata: 16 bytes of data reflected to the communication partner |
967 | * |
968 | * This function temporarily suspends incoming messages on an IUCV path. |
969 | * You can later reactivate the path by invoking the iucv_resume function. |
970 | * |
971 | * Returns the result from the CP IUCV call. |
972 | */ |
973 | int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]) |
974 | { |
975 | union iucv_param *parm; |
976 | int rc; |
977 | |
978 | local_bh_disable(); |
979 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
980 | rc = -EIO; |
981 | goto out; |
982 | } |
983 | parm = iucv_param[smp_processor_id()]; |
984 | memset(parm, 0, sizeof(union iucv_param)); |
985 | if (userdata) |
986 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
987 | parm->ctrl.ippathid = path->pathid; |
988 | rc = iucv_call_b2f0(IUCV_QUIESCE, parm); |
989 | out: |
990 | local_bh_enable(); |
991 | return rc; |
992 | } |
993 | EXPORT_SYMBOL(iucv_path_quiesce); |
994 | |
995 | /** |
996 | * iucv_path_resume: |
997 | * @path: address of iucv path structure |
998 | * @userdata: 16 bytes of data reflected to the communication partner |
999 | * |
1000 | * This function resumes incoming messages on an IUCV path that has |
1001 | * been stopped with iucv_path_quiesce. |
1002 | * |
1003 | * Returns the result from the CP IUCV call. |
1004 | */ |
1005 | int iucv_path_resume(struct iucv_path *path, u8 userdata[16]) |
1006 | { |
1007 | union iucv_param *parm; |
1008 | int rc; |
1009 | |
1010 | local_bh_disable(); |
1011 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1012 | rc = -EIO; |
1013 | goto out; |
1014 | } |
1015 | parm = iucv_param[smp_processor_id()]; |
1016 | memset(parm, 0, sizeof(union iucv_param)); |
1017 | if (userdata) |
1018 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); |
1019 | parm->ctrl.ippathid = path->pathid; |
1020 | rc = iucv_call_b2f0(IUCV_RESUME, parm); |
1021 | out: |
1022 | local_bh_enable(); |
1023 | return rc; |
1024 | } |
1025 | |
1026 | /** |
1027 | * iucv_path_sever |
1028 | * @path: address of iucv path structure |
1029 | * @userdata: 16 bytes of data reflected to the communication partner |
1030 | * |
1031 | * This function terminates an IUCV path. |
1032 | * |
1033 | * Returns the result from the CP IUCV call. |
1034 | */ |
1035 | int iucv_path_sever(struct iucv_path *path, u8 userdata[16]) |
1036 | { |
1037 | int rc; |
1038 | |
1039 | preempt_disable(); |
1040 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1041 | rc = -EIO; |
1042 | goto out; |
1043 | } |
1044 | if (iucv_active_cpu != smp_processor_id()) |
1045 | spin_lock_bh(&iucv_table_lock); |
1046 | rc = iucv_sever_pathid(path->pathid, userdata); |
1047 | iucv_path_table[path->pathid] = NULL; |
1048 | list_del_init(&path->list); |
1049 | if (iucv_active_cpu != smp_processor_id()) |
1050 | spin_unlock_bh(&iucv_table_lock); |
1051 | out: |
1052 | preempt_enable(); |
1053 | return rc; |
1054 | } |
1055 | EXPORT_SYMBOL(iucv_path_sever); |
1056 | |
1057 | /** |
1058 | * iucv_message_purge |
1059 | * @path: address of iucv path structure |
1060 | * @msg: address of iucv msg structure |
1061 | * @srccls: source class of message |
1062 | * |
1063 | * Cancels a message you have sent. |
1064 | * |
1065 | * Returns the result from the CP IUCV call. |
1066 | */ |
1067 | int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, |
1068 | u32 srccls) |
1069 | { |
1070 | union iucv_param *parm; |
1071 | int rc; |
1072 | |
1073 | local_bh_disable(); |
1074 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1075 | rc = -EIO; |
1076 | goto out; |
1077 | } |
1078 | parm = iucv_param[smp_processor_id()]; |
1079 | memset(parm, 0, sizeof(union iucv_param)); |
1080 | parm->purge.ippathid = path->pathid; |
1081 | parm->purge.ipmsgid = msg->id; |
1082 | parm->purge.ipsrccls = srccls; |
1083 | parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; |
1084 | rc = iucv_call_b2f0(IUCV_PURGE, parm); |
1085 | if (!rc) { |
1086 | msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; |
1087 | msg->tag = parm->purge.ipmsgtag; |
1088 | } |
1089 | out: |
1090 | local_bh_enable(); |
1091 | return rc; |
1092 | } |
1093 | EXPORT_SYMBOL(iucv_message_purge); |
1094 | |
1095 | /** |
1096 | * iucv_message_receive_iprmdata |
1097 | * @path: address of iucv path structure |
1098 | * @msg: address of iucv msg structure |
1099 | * @flags: how the message is received (IUCV_IPBUFLST) |
1100 | * @buffer: address of data buffer or address of struct iucv_array |
1101 | * @size: length of data buffer |
1102 | * @residual: |
1103 | * |
1104 | * Internal function used by iucv_message_receive and __iucv_message_receive |
1105 | * to receive RMDATA data stored in struct iucv_message. |
1106 | */ |
1107 | static int iucv_message_receive_iprmdata(struct iucv_path *path, |
1108 | struct iucv_message *msg, |
1109 | u8 flags, void *buffer, |
1110 | size_t size, size_t *residual) |
1111 | { |
1112 | struct iucv_array *array; |
1113 | u8 *rmmsg; |
1114 | size_t copy; |
1115 | |
1116 | /* |
1117 | * Message is 8 bytes long and has been stored to the |
1118 | * message descriptor itself. |
1119 | */ |
1120 | if (residual) |
1121 | *residual = abs(size - 8); |
1122 | rmmsg = msg->rmmsg; |
1123 | if (flags & IUCV_IPBUFLST) { |
1124 | /* Copy to struct iucv_array. */ |
1125 | size = (size < 8) ? size : 8; |
1126 | for (array = buffer; size > 0; array++) { |
1127 | copy = min_t(size_t, size, array->length); |
1128 | memcpy((u8 *)(addr_t) array->address, |
1129 | rmmsg, copy); |
1130 | rmmsg += copy; |
1131 | size -= copy; |
1132 | } |
1133 | } else { |
1134 | /* Copy to direct buffer. */ |
1135 | memcpy(buffer, rmmsg, min_t(size_t, size, 8)); |
1136 | } |
1137 | return 0; |
1138 | } |
1139 | |
1140 | /** |
1141 | * __iucv_message_receive |
1142 | * @path: address of iucv path structure |
1143 | * @msg: address of iucv msg structure |
1144 | * @flags: how the message is received (IUCV_IPBUFLST) |
1145 | * @buffer: address of data buffer or address of struct iucv_array |
1146 | * @size: length of data buffer |
1147 | * @residual: |
1148 | * |
1149 | * This function receives messages that are being sent to you over |
1150 | * established paths. This function will deal with RMDATA messages |
1151 | * embedded in struct iucv_message as well. |
1152 | * |
1153 | * Locking: no locking |
1154 | * |
1155 | * Returns the result from the CP IUCV call. |
1156 | */ |
1157 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1158 | u8 flags, void *buffer, size_t size, size_t *residual) |
1159 | { |
1160 | union iucv_param *parm; |
1161 | int rc; |
1162 | |
1163 | if (msg->flags & IUCV_IPRMDATA) |
1164 | return iucv_message_receive_iprmdata(path, msg, flags, |
1165 | buffer, size, residual); |
1166 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1167 | rc = -EIO; |
1168 | goto out; |
1169 | } |
1170 | parm = iucv_param[smp_processor_id()]; |
1171 | memset(parm, 0, sizeof(union iucv_param)); |
1172 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; |
1173 | parm->db.ipbfln1f = (u32) size; |
1174 | parm->db.ipmsgid = msg->id; |
1175 | parm->db.ippathid = path->pathid; |
1176 | parm->db.iptrgcls = msg->class; |
1177 | parm->db.ipflags1 = (flags | IUCV_IPFGPID | |
1178 | IUCV_IPFGMID | IUCV_IPTRGCLS); |
1179 | rc = iucv_call_b2f0(IUCV_RECEIVE, parm); |
1180 | if (!rc || rc == 5) { |
1181 | msg->flags = parm->db.ipflags1; |
1182 | if (residual) |
1183 | *residual = parm->db.ipbfln1f; |
1184 | } |
1185 | out: |
1186 | return rc; |
1187 | } |
1188 | EXPORT_SYMBOL(__iucv_message_receive); |
1189 | |
1190 | /** |
1191 | * iucv_message_receive |
1192 | * @path: address of iucv path structure |
1193 | * @msg: address of iucv msg structure |
1194 | * @flags: how the message is received (IUCV_IPBUFLST) |
1195 | * @buffer: address of data buffer or address of struct iucv_array |
1196 | * @size: length of data buffer |
1197 | * @residual: |
1198 | * |
1199 | * This function receives messages that are being sent to you over |
1200 | * established paths. This function will deal with RMDATA messages |
1201 | * embedded in struct iucv_message as well. |
1202 | * |
1203 | * Locking: local_bh_enable/local_bh_disable |
1204 | * |
1205 | * Returns the result from the CP IUCV call. |
1206 | */ |
1207 | int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1208 | u8 flags, void *buffer, size_t size, size_t *residual) |
1209 | { |
1210 | int rc; |
1211 | |
1212 | if (msg->flags & IUCV_IPRMDATA) |
1213 | return iucv_message_receive_iprmdata(path, msg, flags, |
1214 | buffer, size, residual); |
1215 | local_bh_disable(); |
1216 | rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); |
1217 | local_bh_enable(); |
1218 | return rc; |
1219 | } |
1220 | EXPORT_SYMBOL(iucv_message_receive); |
1221 | |
1222 | /** |
1223 | * iucv_message_reject |
1224 | * @path: address of iucv path structure |
1225 | * @msg: address of iucv msg structure |
1226 | * |
1227 | * The reject function refuses a specified message. Between the time you |
1228 | * are notified of a message and the time that you complete the message, |
1229 | * the message may be rejected. |
1230 | * |
1231 | * Returns the result from the CP IUCV call. |
1232 | */ |
1233 | int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) |
1234 | { |
1235 | union iucv_param *parm; |
1236 | int rc; |
1237 | |
1238 | local_bh_disable(); |
1239 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1240 | rc = -EIO; |
1241 | goto out; |
1242 | } |
1243 | parm = iucv_param[smp_processor_id()]; |
1244 | memset(parm, 0, sizeof(union iucv_param)); |
1245 | parm->db.ippathid = path->pathid; |
1246 | parm->db.ipmsgid = msg->id; |
1247 | parm->db.iptrgcls = msg->class; |
1248 | parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); |
1249 | rc = iucv_call_b2f0(IUCV_REJECT, parm); |
1250 | out: |
1251 | local_bh_enable(); |
1252 | return rc; |
1253 | } |
1254 | EXPORT_SYMBOL(iucv_message_reject); |
1255 | |
1256 | /** |
1257 | * iucv_message_reply |
1258 | * @path: address of iucv path structure |
1259 | * @msg: address of iucv msg structure |
1260 | * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) |
1261 | * @reply: address of reply data buffer or address of struct iucv_array |
1262 | * @size: length of reply data buffer |
1263 | * |
1264 | * This function responds to the two-way messages that you receive. You |
1265 | * must identify completely the message to which you wish to reply. ie, |
1266 | * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into |
1267 | * the parameter list. |
1268 | * |
1269 | * Returns the result from the CP IUCV call. |
1270 | */ |
1271 | int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, |
1272 | u8 flags, void *reply, size_t size) |
1273 | { |
1274 | union iucv_param *parm; |
1275 | int rc; |
1276 | |
1277 | local_bh_disable(); |
1278 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1279 | rc = -EIO; |
1280 | goto out; |
1281 | } |
1282 | parm = iucv_param[smp_processor_id()]; |
1283 | memset(parm, 0, sizeof(union iucv_param)); |
1284 | if (flags & IUCV_IPRMDATA) { |
1285 | parm->dpl.ippathid = path->pathid; |
1286 | parm->dpl.ipflags1 = flags; |
1287 | parm->dpl.ipmsgid = msg->id; |
1288 | parm->dpl.iptrgcls = msg->class; |
1289 | memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); |
1290 | } else { |
1291 | parm->db.ipbfadr1 = (u32)(addr_t) reply; |
1292 | parm->db.ipbfln1f = (u32) size; |
1293 | parm->db.ippathid = path->pathid; |
1294 | parm->db.ipflags1 = flags; |
1295 | parm->db.ipmsgid = msg->id; |
1296 | parm->db.iptrgcls = msg->class; |
1297 | } |
1298 | rc = iucv_call_b2f0(IUCV_REPLY, parm); |
1299 | out: |
1300 | local_bh_enable(); |
1301 | return rc; |
1302 | } |
1303 | EXPORT_SYMBOL(iucv_message_reply); |
1304 | |
1305 | /** |
1306 | * __iucv_message_send |
1307 | * @path: address of iucv path structure |
1308 | * @msg: address of iucv msg structure |
1309 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) |
1310 | * @srccls: source class of message |
1311 | * @buffer: address of send buffer or address of struct iucv_array |
1312 | * @size: length of send buffer |
1313 | * |
1314 | * This function transmits data to another application. Data to be |
1315 | * transmitted is in a buffer and this is a one-way message and the |
1316 | * receiver will not reply to the message. |
1317 | * |
1318 | * Locking: no locking |
1319 | * |
1320 | * Returns the result from the CP IUCV call. |
1321 | */ |
1322 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
1323 | u8 flags, u32 srccls, void *buffer, size_t size) |
1324 | { |
1325 | union iucv_param *parm; |
1326 | int rc; |
1327 | |
1328 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1329 | rc = -EIO; |
1330 | goto out; |
1331 | } |
1332 | parm = iucv_param[smp_processor_id()]; |
1333 | memset(parm, 0, sizeof(union iucv_param)); |
1334 | if (flags & IUCV_IPRMDATA) { |
1335 | /* Message of 8 bytes can be placed into the parameter list. */ |
1336 | parm->dpl.ippathid = path->pathid; |
1337 | parm->dpl.ipflags1 = flags | IUCV_IPNORPY; |
1338 | parm->dpl.iptrgcls = msg->class; |
1339 | parm->dpl.ipsrccls = srccls; |
1340 | parm->dpl.ipmsgtag = msg->tag; |
1341 | memcpy(parm->dpl.iprmmsg, buffer, 8); |
1342 | } else { |
1343 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; |
1344 | parm->db.ipbfln1f = (u32) size; |
1345 | parm->db.ippathid = path->pathid; |
1346 | parm->db.ipflags1 = flags | IUCV_IPNORPY; |
1347 | parm->db.iptrgcls = msg->class; |
1348 | parm->db.ipsrccls = srccls; |
1349 | parm->db.ipmsgtag = msg->tag; |
1350 | } |
1351 | rc = iucv_call_b2f0(IUCV_SEND, parm); |
1352 | if (!rc) |
1353 | msg->id = parm->db.ipmsgid; |
1354 | out: |
1355 | return rc; |
1356 | } |
1357 | EXPORT_SYMBOL(__iucv_message_send); |
1358 | |
1359 | /** |
1360 | * iucv_message_send |
1361 | * @path: address of iucv path structure |
1362 | * @msg: address of iucv msg structure |
1363 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) |
1364 | * @srccls: source class of message |
1365 | * @buffer: address of send buffer or address of struct iucv_array |
1366 | * @size: length of send buffer |
1367 | * |
1368 | * This function transmits data to another application. Data to be |
1369 | * transmitted is in a buffer and this is a one-way message and the |
1370 | * receiver will not reply to the message. |
1371 | * |
1372 | * Locking: local_bh_enable/local_bh_disable |
1373 | * |
1374 | * Returns the result from the CP IUCV call. |
1375 | */ |
1376 | int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
1377 | u8 flags, u32 srccls, void *buffer, size_t size) |
1378 | { |
1379 | int rc; |
1380 | |
1381 | local_bh_disable(); |
1382 | rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); |
1383 | local_bh_enable(); |
1384 | return rc; |
1385 | } |
1386 | EXPORT_SYMBOL(iucv_message_send); |
1387 | |
1388 | /** |
1389 | * iucv_message_send2way |
1390 | * @path: address of iucv path structure |
1391 | * @msg: address of iucv msg structure |
1392 | * @flags: how the message is sent and the reply is received |
1393 | * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) |
1394 | * @srccls: source class of message |
1395 | * @buffer: address of send buffer or address of struct iucv_array |
1396 | * @size: length of send buffer |
1397 | * @ansbuf: address of answer buffer or address of struct iucv_array |
1398 | * @asize: size of reply buffer |
1399 | * |
1400 | * This function transmits data to another application. Data to be |
1401 | * transmitted is in a buffer. The receiver of the send is expected to |
1402 | * reply to the message and a buffer is provided into which IUCV moves |
1403 | * the reply to this message. |
1404 | * |
1405 | * Returns the result from the CP IUCV call. |
1406 | */ |
1407 | int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, |
1408 | u8 flags, u32 srccls, void *buffer, size_t size, |
1409 | void *answer, size_t asize, size_t *residual) |
1410 | { |
1411 | union iucv_param *parm; |
1412 | int rc; |
1413 | |
1414 | local_bh_disable(); |
1415 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
1416 | rc = -EIO; |
1417 | goto out; |
1418 | } |
1419 | parm = iucv_param[smp_processor_id()]; |
1420 | memset(parm, 0, sizeof(union iucv_param)); |
1421 | if (flags & IUCV_IPRMDATA) { |
1422 | parm->dpl.ippathid = path->pathid; |
1423 | parm->dpl.ipflags1 = path->flags; /* priority message */ |
1424 | parm->dpl.iptrgcls = msg->class; |
1425 | parm->dpl.ipsrccls = srccls; |
1426 | parm->dpl.ipmsgtag = msg->tag; |
1427 | parm->dpl.ipbfadr2 = (u32)(addr_t) answer; |
1428 | parm->dpl.ipbfln2f = (u32) asize; |
1429 | memcpy(parm->dpl.iprmmsg, buffer, 8); |
1430 | } else { |
1431 | parm->db.ippathid = path->pathid; |
1432 | parm->db.ipflags1 = path->flags; /* priority message */ |
1433 | parm->db.iptrgcls = msg->class; |
1434 | parm->db.ipsrccls = srccls; |
1435 | parm->db.ipmsgtag = msg->tag; |
1436 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; |
1437 | parm->db.ipbfln1f = (u32) size; |
1438 | parm->db.ipbfadr2 = (u32)(addr_t) answer; |
1439 | parm->db.ipbfln2f = (u32) asize; |
1440 | } |
1441 | rc = iucv_call_b2f0(IUCV_SEND, parm); |
1442 | if (!rc) |
1443 | msg->id = parm->db.ipmsgid; |
1444 | out: |
1445 | local_bh_enable(); |
1446 | return rc; |
1447 | } |
1448 | EXPORT_SYMBOL(iucv_message_send2way); |
1449 | |
1450 | /** |
1451 | * iucv_path_pending |
1452 | * @data: Pointer to external interrupt buffer |
1453 | * |
1454 | * Process connection pending work item. Called from tasklet while holding |
1455 | * iucv_table_lock. |
1456 | */ |
1457 | struct iucv_path_pending { |
1458 | u16 ippathid; |
1459 | u8 ipflags1; |
1460 | u8 iptype; |
1461 | u16 ipmsglim; |
1462 | u16 res1; |
1463 | u8 ipvmid[8]; |
1464 | u8 ipuser[16]; |
1465 | u32 res3; |
1466 | u8 ippollfg; |
1467 | u8 res4[3]; |
1468 | } __packed; |
1469 | |
1470 | static void iucv_path_pending(struct iucv_irq_data *data) |
1471 | { |
1472 | struct iucv_path_pending *ipp = (void *) data; |
1473 | struct iucv_handler *handler; |
1474 | struct iucv_path *path; |
1475 | char *error; |
1476 | |
1477 | BUG_ON(iucv_path_table[ipp->ippathid]); |
1478 | /* New pathid, handler found. Create a new path struct. */ |
1479 | error = iucv_error_no_memory; |
1480 | path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); |
1481 | if (!path) |
1482 | goto out_sever; |
1483 | path->pathid = ipp->ippathid; |
1484 | iucv_path_table[path->pathid] = path; |
1485 | EBCASC(ipp->ipvmid, 8); |
1486 | |
1487 | /* Call registered handler until one is found that wants the path. */ |
1488 | list_for_each_entry(handler, &iucv_handler_list, list) { |
1489 | if (!handler->path_pending) |
1490 | continue; |
1491 | /* |
1492 | * Add path to handler to allow a call to iucv_path_sever |
1493 | * inside the path_pending function. If the handler returns |
1494 | * an error remove the path from the handler again. |
1495 | */ |
1496 | list_add(&path->list, &handler->paths); |
1497 | path->handler = handler; |
1498 | if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) |
1499 | return; |
1500 | list_del(&path->list); |
1501 | path->handler = NULL; |
1502 | } |
1503 | /* No handler wanted the path. */ |
1504 | iucv_path_table[path->pathid] = NULL; |
1505 | iucv_path_free(path); |
1506 | error = iucv_error_no_listener; |
1507 | out_sever: |
1508 | iucv_sever_pathid(ipp->ippathid, error); |
1509 | } |
1510 | |
1511 | /** |
1512 | * iucv_path_complete |
1513 | * @data: Pointer to external interrupt buffer |
1514 | * |
1515 | * Process connection complete work item. Called from tasklet while holding |
1516 | * iucv_table_lock. |
1517 | */ |
1518 | struct iucv_path_complete { |
1519 | u16 ippathid; |
1520 | u8 ipflags1; |
1521 | u8 iptype; |
1522 | u16 ipmsglim; |
1523 | u16 res1; |
1524 | u8 res2[8]; |
1525 | u8 ipuser[16]; |
1526 | u32 res3; |
1527 | u8 ippollfg; |
1528 | u8 res4[3]; |
1529 | } __packed; |
1530 | |
1531 | static void iucv_path_complete(struct iucv_irq_data *data) |
1532 | { |
1533 | struct iucv_path_complete *ipc = (void *) data; |
1534 | struct iucv_path *path = iucv_path_table[ipc->ippathid]; |
1535 | |
1536 | if (path) |
1537 | path->flags = ipc->ipflags1; |
1538 | if (path && path->handler && path->handler->path_complete) |
1539 | path->handler->path_complete(path, ipc->ipuser); |
1540 | } |
1541 | |
1542 | /** |
1543 | * iucv_path_severed |
1544 | * @data: Pointer to external interrupt buffer |
1545 | * |
1546 | * Process connection severed work item. Called from tasklet while holding |
1547 | * iucv_table_lock. |
1548 | */ |
1549 | struct iucv_path_severed { |
1550 | u16 ippathid; |
1551 | u8 res1; |
1552 | u8 iptype; |
1553 | u32 res2; |
1554 | u8 res3[8]; |
1555 | u8 ipuser[16]; |
1556 | u32 res4; |
1557 | u8 ippollfg; |
1558 | u8 res5[3]; |
1559 | } __packed; |
1560 | |
1561 | static void iucv_path_severed(struct iucv_irq_data *data) |
1562 | { |
1563 | struct iucv_path_severed *ips = (void *) data; |
1564 | struct iucv_path *path = iucv_path_table[ips->ippathid]; |
1565 | |
1566 | if (!path || !path->handler) /* Already severed */ |
1567 | return; |
1568 | if (path->handler->path_severed) |
1569 | path->handler->path_severed(path, ips->ipuser); |
1570 | else { |
1571 | iucv_sever_pathid(path->pathid, NULL); |
1572 | iucv_path_table[path->pathid] = NULL; |
1573 | list_del(&path->list); |
1574 | iucv_path_free(path); |
1575 | } |
1576 | } |
1577 | |
1578 | /** |
1579 | * iucv_path_quiesced |
1580 | * @data: Pointer to external interrupt buffer |
1581 | * |
1582 | * Process connection quiesced work item. Called from tasklet while holding |
1583 | * iucv_table_lock. |
1584 | */ |
1585 | struct iucv_path_quiesced { |
1586 | u16 ippathid; |
1587 | u8 res1; |
1588 | u8 iptype; |
1589 | u32 res2; |
1590 | u8 res3[8]; |
1591 | u8 ipuser[16]; |
1592 | u32 res4; |
1593 | u8 ippollfg; |
1594 | u8 res5[3]; |
1595 | } __packed; |
1596 | |
1597 | static void iucv_path_quiesced(struct iucv_irq_data *data) |
1598 | { |
1599 | struct iucv_path_quiesced *ipq = (void *) data; |
1600 | struct iucv_path *path = iucv_path_table[ipq->ippathid]; |
1601 | |
1602 | if (path && path->handler && path->handler->path_quiesced) |
1603 | path->handler->path_quiesced(path, ipq->ipuser); |
1604 | } |
1605 | |
1606 | /** |
1607 | * iucv_path_resumed |
1608 | * @data: Pointer to external interrupt buffer |
1609 | * |
1610 | * Process connection resumed work item. Called from tasklet while holding |
1611 | * iucv_table_lock. |
1612 | */ |
1613 | struct iucv_path_resumed { |
1614 | u16 ippathid; |
1615 | u8 res1; |
1616 | u8 iptype; |
1617 | u32 res2; |
1618 | u8 res3[8]; |
1619 | u8 ipuser[16]; |
1620 | u32 res4; |
1621 | u8 ippollfg; |
1622 | u8 res5[3]; |
1623 | } __packed; |
1624 | |
1625 | static void iucv_path_resumed(struct iucv_irq_data *data) |
1626 | { |
1627 | struct iucv_path_resumed *ipr = (void *) data; |
1628 | struct iucv_path *path = iucv_path_table[ipr->ippathid]; |
1629 | |
1630 | if (path && path->handler && path->handler->path_resumed) |
1631 | path->handler->path_resumed(path, ipr->ipuser); |
1632 | } |
1633 | |
1634 | /** |
1635 | * iucv_message_complete |
1636 | * @data: Pointer to external interrupt buffer |
1637 | * |
1638 | * Process message complete work item. Called from tasklet while holding |
1639 | * iucv_table_lock. |
1640 | */ |
1641 | struct iucv_message_complete { |
1642 | u16 ippathid; |
1643 | u8 ipflags1; |
1644 | u8 iptype; |
1645 | u32 ipmsgid; |
1646 | u32 ipaudit; |
1647 | u8 iprmmsg[8]; |
1648 | u32 ipsrccls; |
1649 | u32 ipmsgtag; |
1650 | u32 res; |
1651 | u32 ipbfln2f; |
1652 | u8 ippollfg; |
1653 | u8 res2[3]; |
1654 | } __packed; |
1655 | |
1656 | static void iucv_message_complete(struct iucv_irq_data *data) |
1657 | { |
1658 | struct iucv_message_complete *imc = (void *) data; |
1659 | struct iucv_path *path = iucv_path_table[imc->ippathid]; |
1660 | struct iucv_message msg; |
1661 | |
1662 | if (path && path->handler && path->handler->message_complete) { |
1663 | msg.flags = imc->ipflags1; |
1664 | msg.id = imc->ipmsgid; |
1665 | msg.audit = imc->ipaudit; |
1666 | memcpy(msg.rmmsg, imc->iprmmsg, 8); |
1667 | msg.class = imc->ipsrccls; |
1668 | msg.tag = imc->ipmsgtag; |
1669 | msg.length = imc->ipbfln2f; |
1670 | path->handler->message_complete(path, &msg); |
1671 | } |
1672 | } |
1673 | |
1674 | /** |
1675 | * iucv_message_pending |
1676 | * @data: Pointer to external interrupt buffer |
1677 | * |
1678 | * Process message pending work item. Called from tasklet while holding |
1679 | * iucv_table_lock. |
1680 | */ |
1681 | struct iucv_message_pending { |
1682 | u16 ippathid; |
1683 | u8 ipflags1; |
1684 | u8 iptype; |
1685 | u32 ipmsgid; |
1686 | u32 iptrgcls; |
1687 | union { |
1688 | u32 iprmmsg1_u32; |
1689 | u8 iprmmsg1[4]; |
1690 | } ln1msg1; |
1691 | union { |
1692 | u32 ipbfln1f; |
1693 | u8 iprmmsg2[4]; |
1694 | } ln1msg2; |
1695 | u32 res1[3]; |
1696 | u32 ipbfln2f; |
1697 | u8 ippollfg; |
1698 | u8 res2[3]; |
1699 | } __packed; |
1700 | |
1701 | static void iucv_message_pending(struct iucv_irq_data *data) |
1702 | { |
1703 | struct iucv_message_pending *imp = (void *) data; |
1704 | struct iucv_path *path = iucv_path_table[imp->ippathid]; |
1705 | struct iucv_message msg; |
1706 | |
1707 | if (path && path->handler && path->handler->message_pending) { |
1708 | msg.flags = imp->ipflags1; |
1709 | msg.id = imp->ipmsgid; |
1710 | msg.class = imp->iptrgcls; |
1711 | if (imp->ipflags1 & IUCV_IPRMDATA) { |
1712 | memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8); |
1713 | msg.length = 8; |
1714 | } else |
1715 | msg.length = imp->ln1msg2.ipbfln1f; |
1716 | msg.reply_size = imp->ipbfln2f; |
1717 | path->handler->message_pending(path, &msg); |
1718 | } |
1719 | } |
1720 | |
1721 | /** |
1722 | * iucv_tasklet_fn: |
1723 | * |
1724 | * This tasklet loops over the queue of irq buffers created by |
1725 | * iucv_external_interrupt, calls the appropriate action handler |
1726 | * and then frees the buffer. |
1727 | */ |
1728 | static void iucv_tasklet_fn(unsigned long ignored) |
1729 | { |
1730 | typedef void iucv_irq_fn(struct iucv_irq_data *); |
1731 | static iucv_irq_fn *irq_fn[] = { |
1732 | [0x02] = iucv_path_complete, |
1733 | [0x03] = iucv_path_severed, |
1734 | [0x04] = iucv_path_quiesced, |
1735 | [0x05] = iucv_path_resumed, |
1736 | [0x06] = iucv_message_complete, |
1737 | [0x07] = iucv_message_complete, |
1738 | [0x08] = iucv_message_pending, |
1739 | [0x09] = iucv_message_pending, |
1740 | }; |
1741 | LIST_HEAD(task_queue); |
1742 | struct iucv_irq_list *p, *n; |
1743 | |
1744 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ |
1745 | if (!spin_trylock(&iucv_table_lock)) { |
1746 | tasklet_schedule(&iucv_tasklet); |
1747 | return; |
1748 | } |
1749 | iucv_active_cpu = smp_processor_id(); |
1750 | |
1751 | spin_lock_irq(&iucv_queue_lock); |
1752 | list_splice_init(&iucv_task_queue, &task_queue); |
1753 | spin_unlock_irq(&iucv_queue_lock); |
1754 | |
1755 | list_for_each_entry_safe(p, n, &task_queue, list) { |
1756 | list_del_init(&p->list); |
1757 | irq_fn[p->data.iptype](&p->data); |
1758 | kfree(p); |
1759 | } |
1760 | |
1761 | iucv_active_cpu = -1; |
1762 | spin_unlock(&iucv_table_lock); |
1763 | } |
1764 | |
1765 | /** |
1766 | * iucv_work_fn: |
1767 | * |
1768 | * This work function loops over the queue of path pending irq blocks |
1769 | * created by iucv_external_interrupt, calls the appropriate action |
1770 | * handler and then frees the buffer. |
1771 | */ |
1772 | static void iucv_work_fn(struct work_struct *work) |
1773 | { |
1774 | LIST_HEAD(work_queue); |
1775 | struct iucv_irq_list *p, *n; |
1776 | |
1777 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ |
1778 | spin_lock_bh(&iucv_table_lock); |
1779 | iucv_active_cpu = smp_processor_id(); |
1780 | |
1781 | spin_lock_irq(&iucv_queue_lock); |
1782 | list_splice_init(&iucv_work_queue, &work_queue); |
1783 | spin_unlock_irq(&iucv_queue_lock); |
1784 | |
1785 | iucv_cleanup_queue(); |
1786 | list_for_each_entry_safe(p, n, &work_queue, list) { |
1787 | list_del_init(&p->list); |
1788 | iucv_path_pending(&p->data); |
1789 | kfree(p); |
1790 | } |
1791 | |
1792 | iucv_active_cpu = -1; |
1793 | spin_unlock_bh(&iucv_table_lock); |
1794 | } |
1795 | |
1796 | /** |
1797 | * iucv_external_interrupt |
1798 | * @code: irq code |
1799 | * |
1800 | * Handles external interrupts coming in from CP. |
1801 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
1802 | */ |
1803 | static void iucv_external_interrupt(struct ext_code ext_code, |
1804 | unsigned int param32, unsigned long param64) |
1805 | { |
1806 | struct iucv_irq_data *p; |
1807 | struct iucv_irq_list *work; |
1808 | |
1809 | kstat_cpu(smp_processor_id()).irqs[EXTINT_IUC]++; |
1810 | p = iucv_irq_data[smp_processor_id()]; |
1811 | if (p->ippathid >= iucv_max_pathid) { |
1812 | WARN_ON(p->ippathid >= iucv_max_pathid); |
1813 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
1814 | return; |
1815 | } |
1816 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
1817 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
1818 | if (!work) { |
1819 | pr_warning("iucv_external_interrupt: out of memory\n"); |
1820 | return; |
1821 | } |
1822 | memcpy(&work->data, p, sizeof(work->data)); |
1823 | spin_lock(&iucv_queue_lock); |
1824 | if (p->iptype == 0x01) { |
1825 | /* Path pending interrupt. */ |
1826 | list_add_tail(&work->list, &iucv_work_queue); |
1827 | schedule_work(&iucv_work); |
1828 | } else { |
1829 | /* The other interrupts. */ |
1830 | list_add_tail(&work->list, &iucv_task_queue); |
1831 | tasklet_schedule(&iucv_tasklet); |
1832 | } |
1833 | spin_unlock(&iucv_queue_lock); |
1834 | } |
1835 | |
1836 | static int iucv_pm_prepare(struct device *dev) |
1837 | { |
1838 | int rc = 0; |
1839 | |
1840 | #ifdef CONFIG_PM_DEBUG |
1841 | printk(KERN_INFO "iucv_pm_prepare\n"); |
1842 | #endif |
1843 | if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) |
1844 | rc = dev->driver->pm->prepare(dev); |
1845 | return rc; |
1846 | } |
1847 | |
1848 | static void iucv_pm_complete(struct device *dev) |
1849 | { |
1850 | #ifdef CONFIG_PM_DEBUG |
1851 | printk(KERN_INFO "iucv_pm_complete\n"); |
1852 | #endif |
1853 | if (dev->driver && dev->driver->pm && dev->driver->pm->complete) |
1854 | dev->driver->pm->complete(dev); |
1855 | } |
1856 | |
1857 | /** |
1858 | * iucv_path_table_empty() - determine if iucv path table is empty |
1859 | * |
1860 | * Returns 0 if there are still iucv pathes defined |
1861 | * 1 if there are no iucv pathes defined |
1862 | */ |
1863 | int iucv_path_table_empty(void) |
1864 | { |
1865 | int i; |
1866 | |
1867 | for (i = 0; i < iucv_max_pathid; i++) { |
1868 | if (iucv_path_table[i]) |
1869 | return 0; |
1870 | } |
1871 | return 1; |
1872 | } |
1873 | |
1874 | /** |
1875 | * iucv_pm_freeze() - Freeze PM callback |
1876 | * @dev: iucv-based device |
1877 | * |
1878 | * disable iucv interrupts |
1879 | * invoke callback function of the iucv-based driver |
1880 | * shut down iucv, if no iucv-pathes are established anymore |
1881 | */ |
1882 | static int iucv_pm_freeze(struct device *dev) |
1883 | { |
1884 | int cpu; |
1885 | struct iucv_irq_list *p, *n; |
1886 | int rc = 0; |
1887 | |
1888 | #ifdef CONFIG_PM_DEBUG |
1889 | printk(KERN_WARNING "iucv_pm_freeze\n"); |
1890 | #endif |
1891 | if (iucv_pm_state != IUCV_PM_FREEZING) { |
1892 | for_each_cpu(cpu, &iucv_irq_cpumask) |
1893 | smp_call_function_single(cpu, iucv_block_cpu_almost, |
1894 | NULL, 1); |
1895 | cancel_work_sync(&iucv_work); |
1896 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) { |
1897 | list_del_init(&p->list); |
1898 | iucv_sever_pathid(p->data.ippathid, |
1899 | iucv_error_no_listener); |
1900 | kfree(p); |
1901 | } |
1902 | } |
1903 | iucv_pm_state = IUCV_PM_FREEZING; |
1904 | if (dev->driver && dev->driver->pm && dev->driver->pm->freeze) |
1905 | rc = dev->driver->pm->freeze(dev); |
1906 | if (iucv_path_table_empty()) |
1907 | iucv_disable(); |
1908 | return rc; |
1909 | } |
1910 | |
1911 | /** |
1912 | * iucv_pm_thaw() - Thaw PM callback |
1913 | * @dev: iucv-based device |
1914 | * |
1915 | * make iucv ready for use again: allocate path table, declare interrupt buffers |
1916 | * and enable iucv interrupts |
1917 | * invoke callback function of the iucv-based driver |
1918 | */ |
1919 | static int iucv_pm_thaw(struct device *dev) |
1920 | { |
1921 | int rc = 0; |
1922 | |
1923 | #ifdef CONFIG_PM_DEBUG |
1924 | printk(KERN_WARNING "iucv_pm_thaw\n"); |
1925 | #endif |
1926 | iucv_pm_state = IUCV_PM_THAWING; |
1927 | if (!iucv_path_table) { |
1928 | rc = iucv_enable(); |
1929 | if (rc) |
1930 | goto out; |
1931 | } |
1932 | if (cpumask_empty(&iucv_irq_cpumask)) { |
1933 | if (iucv_nonsmp_handler) |
1934 | /* enable interrupts on one cpu */ |
1935 | iucv_allow_cpu(NULL); |
1936 | else |
1937 | /* enable interrupts on all cpus */ |
1938 | iucv_setmask_mp(); |
1939 | } |
1940 | if (dev->driver && dev->driver->pm && dev->driver->pm->thaw) |
1941 | rc = dev->driver->pm->thaw(dev); |
1942 | out: |
1943 | return rc; |
1944 | } |
1945 | |
1946 | /** |
1947 | * iucv_pm_restore() - Restore PM callback |
1948 | * @dev: iucv-based device |
1949 | * |
1950 | * make iucv ready for use again: allocate path table, declare interrupt buffers |
1951 | * and enable iucv interrupts |
1952 | * invoke callback function of the iucv-based driver |
1953 | */ |
1954 | static int iucv_pm_restore(struct device *dev) |
1955 | { |
1956 | int rc = 0; |
1957 | |
1958 | #ifdef CONFIG_PM_DEBUG |
1959 | printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table); |
1960 | #endif |
1961 | if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table) |
1962 | pr_warning("Suspending Linux did not completely close all IUCV " |
1963 | "connections\n"); |
1964 | iucv_pm_state = IUCV_PM_RESTORING; |
1965 | if (cpumask_empty(&iucv_irq_cpumask)) { |
1966 | rc = iucv_query_maxconn(); |
1967 | rc = iucv_enable(); |
1968 | if (rc) |
1969 | goto out; |
1970 | } |
1971 | if (dev->driver && dev->driver->pm && dev->driver->pm->restore) |
1972 | rc = dev->driver->pm->restore(dev); |
1973 | out: |
1974 | return rc; |
1975 | } |
1976 | |
1977 | struct iucv_interface iucv_if = { |
1978 | .message_receive = iucv_message_receive, |
1979 | .__message_receive = __iucv_message_receive, |
1980 | .message_reply = iucv_message_reply, |
1981 | .message_reject = iucv_message_reject, |
1982 | .message_send = iucv_message_send, |
1983 | .__message_send = __iucv_message_send, |
1984 | .message_send2way = iucv_message_send2way, |
1985 | .message_purge = iucv_message_purge, |
1986 | .path_accept = iucv_path_accept, |
1987 | .path_connect = iucv_path_connect, |
1988 | .path_quiesce = iucv_path_quiesce, |
1989 | .path_resume = iucv_path_resume, |
1990 | .path_sever = iucv_path_sever, |
1991 | .iucv_register = iucv_register, |
1992 | .iucv_unregister = iucv_unregister, |
1993 | .bus = NULL, |
1994 | .root = NULL, |
1995 | }; |
1996 | EXPORT_SYMBOL(iucv_if); |
1997 | |
1998 | /** |
1999 | * iucv_init |
2000 | * |
2001 | * Allocates and initializes various data structures. |
2002 | */ |
2003 | static int __init iucv_init(void) |
2004 | { |
2005 | int rc; |
2006 | int cpu; |
2007 | |
2008 | if (!MACHINE_IS_VM) { |
2009 | rc = -EPROTONOSUPPORT; |
2010 | goto out; |
2011 | } |
2012 | ctl_set_bit(0, 1); |
2013 | rc = iucv_query_maxconn(); |
2014 | if (rc) |
2015 | goto out_ctl; |
2016 | rc = register_external_interrupt(0x4000, iucv_external_interrupt); |
2017 | if (rc) |
2018 | goto out_ctl; |
2019 | iucv_root = root_device_register("iucv"); |
2020 | if (IS_ERR(iucv_root)) { |
2021 | rc = PTR_ERR(iucv_root); |
2022 | goto out_int; |
2023 | } |
2024 | |
2025 | for_each_online_cpu(cpu) { |
2026 | /* Note: GFP_DMA used to get memory below 2G */ |
2027 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), |
2028 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
2029 | if (!iucv_irq_data[cpu]) { |
2030 | rc = -ENOMEM; |
2031 | goto out_free; |
2032 | } |
2033 | |
2034 | /* Allocate parameter blocks. */ |
2035 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
2036 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
2037 | if (!iucv_param[cpu]) { |
2038 | rc = -ENOMEM; |
2039 | goto out_free; |
2040 | } |
2041 | iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), |
2042 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); |
2043 | if (!iucv_param_irq[cpu]) { |
2044 | rc = -ENOMEM; |
2045 | goto out_free; |
2046 | } |
2047 | |
2048 | } |
2049 | rc = register_hotcpu_notifier(&iucv_cpu_notifier); |
2050 | if (rc) |
2051 | goto out_free; |
2052 | rc = register_reboot_notifier(&iucv_reboot_notifier); |
2053 | if (rc) |
2054 | goto out_cpu; |
2055 | ASCEBC(iucv_error_no_listener, 16); |
2056 | ASCEBC(iucv_error_no_memory, 16); |
2057 | ASCEBC(iucv_error_pathid, 16); |
2058 | iucv_available = 1; |
2059 | rc = bus_register(&iucv_bus); |
2060 | if (rc) |
2061 | goto out_reboot; |
2062 | iucv_if.root = iucv_root; |
2063 | iucv_if.bus = &iucv_bus; |
2064 | return 0; |
2065 | |
2066 | out_reboot: |
2067 | unregister_reboot_notifier(&iucv_reboot_notifier); |
2068 | out_cpu: |
2069 | unregister_hotcpu_notifier(&iucv_cpu_notifier); |
2070 | out_free: |
2071 | for_each_possible_cpu(cpu) { |
2072 | kfree(iucv_param_irq[cpu]); |
2073 | iucv_param_irq[cpu] = NULL; |
2074 | kfree(iucv_param[cpu]); |
2075 | iucv_param[cpu] = NULL; |
2076 | kfree(iucv_irq_data[cpu]); |
2077 | iucv_irq_data[cpu] = NULL; |
2078 | } |
2079 | root_device_unregister(iucv_root); |
2080 | out_int: |
2081 | unregister_external_interrupt(0x4000, iucv_external_interrupt); |
2082 | out_ctl: |
2083 | ctl_clear_bit(0, 1); |
2084 | out: |
2085 | return rc; |
2086 | } |
2087 | |
2088 | /** |
2089 | * iucv_exit |
2090 | * |
2091 | * Frees everything allocated from iucv_init. |
2092 | */ |
2093 | static void __exit iucv_exit(void) |
2094 | { |
2095 | struct iucv_irq_list *p, *n; |
2096 | int cpu; |
2097 | |
2098 | spin_lock_irq(&iucv_queue_lock); |
2099 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) |
2100 | kfree(p); |
2101 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
2102 | kfree(p); |
2103 | spin_unlock_irq(&iucv_queue_lock); |
2104 | unregister_reboot_notifier(&iucv_reboot_notifier); |
2105 | unregister_hotcpu_notifier(&iucv_cpu_notifier); |
2106 | for_each_possible_cpu(cpu) { |
2107 | kfree(iucv_param_irq[cpu]); |
2108 | iucv_param_irq[cpu] = NULL; |
2109 | kfree(iucv_param[cpu]); |
2110 | iucv_param[cpu] = NULL; |
2111 | kfree(iucv_irq_data[cpu]); |
2112 | iucv_irq_data[cpu] = NULL; |
2113 | } |
2114 | root_device_unregister(iucv_root); |
2115 | bus_unregister(&iucv_bus); |
2116 | unregister_external_interrupt(0x4000, iucv_external_interrupt); |
2117 | } |
2118 | |
2119 | subsys_initcall(iucv_init); |
2120 | module_exit(iucv_exit); |
2121 | |
2122 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
2123 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); |
2124 | MODULE_LICENSE("GPL"); |
2125 |
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