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2356f4cb MS |
1 | /* |
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 | ||
8f7c502c UB |
33 | #define KMSG_COMPONENT "iucv" |
34 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
35 | ||
2356f4cb MS |
36 | #include <linux/module.h> |
37 | #include <linux/moduleparam.h> | |
2356f4cb MS |
38 | #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> | |
2356f4cb MS |
53 | #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 | ||
da99f056 | 73 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
2356f4cb MS |
74 | { |
75 | return 0; | |
76 | } | |
77 | ||
78 | struct bus_type iucv_bus = { | |
79 | .name = "iucv", | |
80 | .match = iucv_bus_match, | |
81 | }; | |
da99f056 | 82 | EXPORT_SYMBOL(iucv_bus); |
2356f4cb MS |
83 | |
84 | struct device *iucv_root; | |
da99f056 HC |
85 | EXPORT_SYMBOL(iucv_root); |
86 | ||
2356f4cb MS |
87 | static int iucv_available; |
88 | ||
89 | /* General IUCV interrupt structure */ | |
90 | struct iucv_irq_data { | |
91 | u16 ippathid; | |
92 | u8 ipflags1; | |
93 | u8 iptype; | |
94 | u32 res2[8]; | |
95 | }; | |
96 | ||
04b090d5 | 97 | struct iucv_irq_list { |
2356f4cb MS |
98 | struct list_head list; |
99 | struct iucv_irq_data data; | |
100 | }; | |
101 | ||
70cf5035 | 102 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
2356f4cb MS |
103 | static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE; |
104 | static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE; | |
105 | ||
04b090d5 MS |
106 | /* |
107 | * Queue of interrupt buffers lock for delivery via the tasklet | |
108 | * (fast but can't call smp_call_function). | |
109 | */ | |
110 | static LIST_HEAD(iucv_task_queue); | |
111 | ||
112 | /* | |
113 | * The tasklet for fast delivery of iucv interrupts. | |
114 | */ | |
115 | static void iucv_tasklet_fn(unsigned long); | |
116 | static 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 | */ | |
122 | static LIST_HEAD(iucv_work_queue); | |
123 | ||
124 | /* | |
125 | * The work element to deliver path pending interrupts. | |
126 | */ | |
127 | static void iucv_work_fn(struct work_struct *work); | |
128 | static DECLARE_WORK(iucv_work, iucv_work_fn); | |
129 | ||
130 | /* | |
131 | * Spinlock protecting task and work queue. | |
132 | */ | |
133 | static DEFINE_SPINLOCK(iucv_queue_lock); | |
2356f4cb MS |
134 | |
135 | enum 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 | */ | |
156 | static char iucv_error_no_listener[16] = "NO LISTENER"; | |
157 | static char iucv_error_no_memory[16] = "NO MEMORY"; | |
158 | static char iucv_error_pathid[16] = "INVALID PATHID"; | |
159 | ||
160 | /* | |
161 | * iucv_handler_list: List of registered handlers. | |
162 | */ | |
163 | static LIST_HEAD(iucv_handler_list); | |
164 | ||
165 | /* | |
166 | * iucv_path_table: an array of iucv_path structures. | |
167 | */ | |
168 | static struct iucv_path **iucv_path_table; | |
169 | static unsigned long iucv_max_pathid; | |
170 | ||
171 | /* | |
172 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table | |
173 | */ | |
174 | static DEFINE_SPINLOCK(iucv_table_lock); | |
175 | ||
176 | /* | |
04b090d5 MS |
177 | * 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. | |
2356f4cb | 179 | */ |
04b090d5 | 180 | static int iucv_active_cpu = -1; |
2356f4cb MS |
181 | |
182 | /* | |
183 | * Mutex and wait queue for iucv_register/iucv_unregister. | |
184 | */ | |
185 | static DEFINE_MUTEX(iucv_register_mutex); | |
186 | ||
187 | /* | |
188 | * Counter for number of non-smp capable handlers. | |
189 | */ | |
190 | static 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 | */ | |
196 | struct 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 | */ | |
211 | struct 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 | */ | |
230 | struct 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 | */ | |
248 | struct 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 | */ | |
264 | struct iucv_cmd_set_mask { | |
265 | u8 ipmask; | |
266 | u8 res1[2]; | |
267 | u8 iprcode; | |
268 | u32 res2[9]; | |
269 | } __attribute__ ((packed,aligned(8))); | |
270 | ||
271 | union 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 | */ | |
70cf5035 | 282 | static union iucv_param *iucv_param[NR_CPUS]; |
2356f4cb MS |
283 | |
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 | */ | |
293 | static 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 | */ | |
318 | static 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 | */ | |
347 | static 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 | */ | |
70cf5035 | 361 | parm = iucv_param[cpu]; |
2356f4cb MS |
362 | 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 | */ | |
376 | static void iucv_block_cpu(void *data) | |
377 | { | |
378 | int cpu = smp_processor_id(); | |
379 | union iucv_param *parm; | |
380 | ||
381 | /* Disable all iucv interrupts. */ | |
70cf5035 | 382 | parm = iucv_param[cpu]; |
2356f4cb MS |
383 | 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 | * | |
3a4fa0a2 | 394 | * Declare a interrupt buffer on this cpu. |
2356f4cb MS |
395 | */ |
396 | static 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. */ | |
70cf5035 | 406 | parm = iucv_param[cpu]; |
2356f4cb | 407 | memset(parm, 0, sizeof(union iucv_param)); |
70cf5035 | 408 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
2356f4cb MS |
409 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
410 | if (rc) { | |
411 | char *err = "Unknown"; | |
da99f056 | 412 | switch (rc) { |
2356f4cb MS |
413 | 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 | } | |
8f7c502c UB |
429 | pr_warning("Defining an interrupt buffer on CPU %i" |
430 | " failed with 0x%02x (%s)\n", cpu, rc, err); | |
2356f4cb MS |
431 | 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 | */ | |
451 | static 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. */ | |
70cf5035 | 463 | parm = iucv_param[cpu]; |
2356f4cb MS |
464 | 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 | */ | |
475 | static void iucv_setmask_mp(void) | |
476 | { | |
477 | int cpu; | |
478 | ||
7b9d1b22 | 479 | get_online_cpus(); |
2356f4cb MS |
480 | 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)) | |
3bb447fc | 484 | smp_call_function_single(cpu, iucv_allow_cpu, |
8691e5a8 | 485 | NULL, 1); |
7b9d1b22 | 486 | put_online_cpus(); |
2356f4cb MS |
487 | } |
488 | ||
489 | /** | |
490 | * iucv_setmask_up | |
491 | * | |
04b090d5 | 492 | * Allow iucv interrupts on a single cpu. |
2356f4cb MS |
493 | */ |
494 | static 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); | |
0e12f848 | 502 | for_each_cpu_mask_nr(cpu, cpumask) |
8691e5a8 | 503 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
2356f4cb MS |
504 | } |
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 | */ | |
514 | static int iucv_enable(void) | |
515 | { | |
516 | size_t alloc_size; | |
517 | int cpu, rc; | |
518 | ||
f1d3e4dc | 519 | get_online_cpus(); |
2356f4cb MS |
520 | rc = -ENOMEM; |
521 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); | |
522 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); | |
523 | if (!iucv_path_table) | |
524 | goto out; | |
525 | /* Declare per cpu buffers. */ | |
526 | rc = -EIO; | |
527 | for_each_online_cpu(cpu) | |
8691e5a8 | 528 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
529 | if (cpus_empty(iucv_buffer_cpumask)) |
530 | /* No cpu could declare an iucv buffer. */ | |
f1d3e4dc | 531 | goto out; |
7b9d1b22 | 532 | put_online_cpus(); |
2356f4cb | 533 | return 0; |
2356f4cb | 534 | out: |
f1d3e4dc HC |
535 | kfree(iucv_path_table); |
536 | iucv_path_table = NULL; | |
537 | put_online_cpus(); | |
2356f4cb MS |
538 | 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 | */ | |
548 | static void iucv_disable(void) | |
549 | { | |
8b122efd | 550 | get_online_cpus(); |
15c8b6c1 | 551 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 552 | kfree(iucv_path_table); |
f1d3e4dc HC |
553 | iucv_path_table = NULL; |
554 | put_online_cpus(); | |
2356f4cb MS |
555 | } |
556 | ||
2356f4cb MS |
557 | static 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: | |
8bb78442 | 565 | case CPU_UP_PREPARE_FROZEN: |
70cf5035 CL |
566 | 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]) | |
2356f4cb | 569 | return NOTIFY_BAD; |
70cf5035 CL |
570 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
571 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
d0236f8f AM |
572 | if (!iucv_param[cpu]) { |
573 | kfree(iucv_irq_data[cpu]); | |
574 | iucv_irq_data[cpu] = NULL; | |
2356f4cb | 575 | return NOTIFY_BAD; |
d0236f8f | 576 | } |
2356f4cb MS |
577 | break; |
578 | case CPU_UP_CANCELED: | |
8bb78442 | 579 | case CPU_UP_CANCELED_FROZEN: |
2356f4cb | 580 | case CPU_DEAD: |
8bb78442 | 581 | case CPU_DEAD_FROZEN: |
70cf5035 CL |
582 | kfree(iucv_param[cpu]); |
583 | iucv_param[cpu] = NULL; | |
584 | kfree(iucv_irq_data[cpu]); | |
585 | iucv_irq_data[cpu] = NULL; | |
2356f4cb MS |
586 | break; |
587 | case CPU_ONLINE: | |
8bb78442 | 588 | case CPU_ONLINE_FROZEN: |
2356f4cb | 589 | case CPU_DOWN_FAILED: |
8bb78442 | 590 | case CPU_DOWN_FAILED_FROZEN: |
f1d3e4dc HC |
591 | if (!iucv_path_table) |
592 | break; | |
8691e5a8 | 593 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
594 | break; |
595 | case CPU_DOWN_PREPARE: | |
8bb78442 | 596 | case CPU_DOWN_PREPARE_FROZEN: |
f1d3e4dc HC |
597 | if (!iucv_path_table) |
598 | break; | |
2356f4cb MS |
599 | 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; | |
8691e5a8 | 604 | smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 605 | if (cpus_empty(iucv_irq_cpumask)) |
3bb447fc | 606 | smp_call_function_single(first_cpu(iucv_buffer_cpumask), |
8691e5a8 | 607 | iucv_allow_cpu, NULL, 1); |
2356f4cb MS |
608 | break; |
609 | } | |
610 | return NOTIFY_OK; | |
611 | } | |
612 | ||
f1494ed1 | 613 | static struct notifier_block __refdata iucv_cpu_notifier = { |
2356f4cb MS |
614 | .notifier_call = iucv_cpu_notify, |
615 | }; | |
2356f4cb MS |
616 | |
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 | */ | |
624 | static int iucv_sever_pathid(u16 pathid, u8 userdata[16]) | |
625 | { | |
626 | union iucv_param *parm; | |
627 | ||
70cf5035 | 628 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
629 | 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 | /** | |
04b090d5 | 637 | * __iucv_cleanup_queue |
2356f4cb MS |
638 | * @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 | */ | |
04b090d5 | 643 | static void __iucv_cleanup_queue(void *dummy) |
2356f4cb MS |
644 | { |
645 | } | |
646 | ||
647 | /** | |
04b090d5 | 648 | * iucv_cleanup_queue |
2356f4cb MS |
649 | * |
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 | */ | |
04b090d5 | 654 | static void iucv_cleanup_queue(void) |
2356f4cb | 655 | { |
04b090d5 | 656 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
657 | |
658 | /* | |
04b090d5 MS |
659 | * 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. | |
2356f4cb | 666 | */ |
8691e5a8 | 667 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
04b090d5 MS |
668 | 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) { | |
2356f4cb MS |
672 | list_del(&p->list); |
673 | kfree(p); | |
674 | } | |
675 | } | |
04b090d5 | 676 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb MS |
677 | } |
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 | */ | |
689 | int 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 | ||
435bc9df | 706 | spin_lock_bh(&iucv_table_lock); |
2356f4cb | 707 | list_add_tail(&handler->list, &iucv_handler_list); |
435bc9df | 708 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
709 | rc = 0; |
710 | out_mutex: | |
711 | mutex_unlock(&iucv_register_mutex); | |
712 | return rc; | |
713 | } | |
da99f056 | 714 | EXPORT_SYMBOL(iucv_register); |
2356f4cb MS |
715 | |
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 | */ | |
723 | void 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); | |
2356f4cb MS |
736 | 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 | } | |
da99f056 | 747 | EXPORT_SYMBOL(iucv_unregister); |
2356f4cb MS |
748 | |
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 | */ | |
761 | int 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. */ | |
70cf5035 | 769 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
770 | 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 | } | |
da99f056 | 786 | EXPORT_SYMBOL(iucv_path_accept); |
2356f4cb MS |
787 | |
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 | */ | |
803 | int 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 | ||
04b090d5 MS |
810 | spin_lock_bh(&iucv_table_lock); |
811 | iucv_cleanup_queue(); | |
70cf5035 | 812 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
813 | 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 | } | |
04b090d5 | 846 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
847 | return rc; |
848 | } | |
da99f056 | 849 | EXPORT_SYMBOL(iucv_path_connect); |
2356f4cb MS |
850 | |
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 | */ | |
861 | int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]) | |
862 | { | |
863 | union iucv_param *parm; | |
864 | int rc; | |
865 | ||
866 | local_bh_disable(); | |
70cf5035 | 867 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
868 | 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 | } | |
da99f056 | 876 | EXPORT_SYMBOL(iucv_path_quiesce); |
2356f4cb MS |
877 | |
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 | */ | |
888 | int iucv_path_resume(struct iucv_path *path, u8 userdata[16]) | |
889 | { | |
890 | union iucv_param *parm; | |
891 | int rc; | |
892 | ||
893 | local_bh_disable(); | |
70cf5035 | 894 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
895 | 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 | */ | |
913 | int iucv_path_sever(struct iucv_path *path, u8 userdata[16]) | |
914 | { | |
915 | int rc; | |
916 | ||
2356f4cb | 917 | preempt_disable(); |
04b090d5 | 918 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
919 | 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); | |
2356f4cb | 924 | } |
04b090d5 | 925 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
926 | spin_unlock_bh(&iucv_table_lock); |
927 | preempt_enable(); | |
928 | return rc; | |
929 | } | |
da99f056 | 930 | EXPORT_SYMBOL(iucv_path_sever); |
2356f4cb MS |
931 | |
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 | */ | |
942 | int 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(); | |
70cf5035 | 949 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
950 | 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 | } | |
da99f056 | 963 | EXPORT_SYMBOL(iucv_message_purge); |
2356f4cb MS |
964 | |
965 | /** | |
91d5d45e HB |
966 | * 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 | */ | |
977 | static 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 | |
2356f4cb MS |
1012 | * @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 | * | |
91d5d45e HB |
1023 | * Locking: no locking |
1024 | * | |
2356f4cb MS |
1025 | * Returns the result from the CP IUCV call. |
1026 | */ | |
91d5d45e HB |
1027 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1028 | u8 flags, void *buffer, size_t size, size_t *residual) | |
2356f4cb MS |
1029 | { |
1030 | union iucv_param *parm; | |
2356f4cb MS |
1031 | int rc; |
1032 | ||
91d5d45e HB |
1033 | if (msg->flags & IUCV_IPRMDATA) |
1034 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1035 | buffer, size, residual); | |
70cf5035 | 1036 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1037 | 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 | } | |
91d5d45e HB |
1051 | return rc; |
1052 | } | |
1053 | EXPORT_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 | */ | |
1072 | int 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); | |
2356f4cb MS |
1082 | local_bh_enable(); |
1083 | return rc; | |
1084 | } | |
da99f056 | 1085 | EXPORT_SYMBOL(iucv_message_receive); |
2356f4cb MS |
1086 | |
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 | */ | |
1098 | int 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(); | |
70cf5035 | 1104 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1105 | 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 | } | |
da99f056 | 1114 | EXPORT_SYMBOL(iucv_message_reject); |
2356f4cb MS |
1115 | |
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 | */ | |
1131 | int 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(); | |
70cf5035 | 1138 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1139 | 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 | } | |
da99f056 | 1158 | EXPORT_SYMBOL(iucv_message_reply); |
2356f4cb MS |
1159 | |
1160 | /** | |
91d5d45e | 1161 | * __iucv_message_send |
2356f4cb MS |
1162 | * @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 | * | |
91d5d45e HB |
1173 | * Locking: no locking |
1174 | * | |
2356f4cb MS |
1175 | * Returns the result from the CP IUCV call. |
1176 | */ | |
91d5d45e | 1177 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
2356f4cb MS |
1178 | u8 flags, u32 srccls, void *buffer, size_t size) |
1179 | { | |
1180 | union iucv_param *parm; | |
1181 | int rc; | |
1182 | ||
70cf5035 | 1183 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1184 | 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; | |
91d5d45e HB |
1205 | return rc; |
1206 | } | |
1207 | EXPORT_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 | */ | |
1226 | int 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); | |
2356f4cb MS |
1233 | local_bh_enable(); |
1234 | return rc; | |
1235 | } | |
da99f056 | 1236 | EXPORT_SYMBOL(iucv_message_send); |
2356f4cb MS |
1237 | |
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 | */ | |
1257 | int 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(); | |
70cf5035 | 1265 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1266 | 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 | } | |
da99f056 | 1293 | EXPORT_SYMBOL(iucv_message_send2way); |
2356f4cb MS |
1294 | |
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 | */ | |
1302 | struct 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 | ||
1315 | static 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; | |
1352 | out_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 | */ | |
1363 | struct 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 | ||
1376 | static 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 | ||
04b090d5 | 1381 | if (path && path->handler && path->handler->path_complete) |
2356f4cb MS |
1382 | 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 | */ | |
1392 | struct 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 | ||
1404 | static 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 | ||
04b090d5 MS |
1409 | if (!path || !path->handler) /* Already severed */ |
1410 | return; | |
2356f4cb MS |
1411 | 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); | |
2356f4cb MS |
1417 | 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 | */ | |
1428 | struct 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 | ||
1440 | static 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 | ||
04b090d5 | 1445 | if (path && path->handler && path->handler->path_quiesced) |
2356f4cb MS |
1446 | 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 | */ | |
1456 | struct 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 | ||
1468 | static 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 | ||
04b090d5 | 1473 | if (path && path->handler && path->handler->path_resumed) |
2356f4cb MS |
1474 | 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 | */ | |
1484 | struct 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 | ||
1499 | static 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 | ||
04b090d5 | 1505 | if (path && path->handler && path->handler->message_complete) { |
2356f4cb MS |
1506 | 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 | */ | |
1524 | struct 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 | ||
1544 | static 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 | ||
04b090d5 | 1550 | if (path && path->handler && path->handler->message_pending) { |
2356f4cb MS |
1551 | 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 | /** | |
04b090d5 | 1565 | * iucv_tasklet_fn: |
2356f4cb MS |
1566 | * |
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 | */ | |
04b090d5 | 1571 | static void iucv_tasklet_fn(unsigned long ignored) |
2356f4cb MS |
1572 | { |
1573 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
1574 | static iucv_irq_fn *irq_fn[] = { | |
2356f4cb MS |
1575 | [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 | }; | |
b5e78337 | 1584 | LIST_HEAD(task_queue); |
04b090d5 | 1585 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
1586 | |
1587 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
13fdc9a7 UB |
1588 | if (!spin_trylock(&iucv_table_lock)) { |
1589 | tasklet_schedule(&iucv_tasklet); | |
1590 | return; | |
1591 | } | |
04b090d5 | 1592 | iucv_active_cpu = smp_processor_id(); |
2356f4cb | 1593 | |
04b090d5 MS |
1594 | 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) { | |
2356f4cb | 1599 | list_del_init(&p->list); |
2356f4cb MS |
1600 | irq_fn[p->data.iptype](&p->data); |
1601 | kfree(p); | |
2356f4cb | 1602 | } |
2356f4cb | 1603 | |
04b090d5 | 1604 | iucv_active_cpu = -1; |
2356f4cb MS |
1605 | spin_unlock(&iucv_table_lock); |
1606 | } | |
1607 | ||
04b090d5 MS |
1608 | /** |
1609 | * 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 | */ | |
1615 | static void iucv_work_fn(struct work_struct *work) | |
1616 | { | |
1617 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
b5e78337 | 1618 | LIST_HEAD(work_queue); |
04b090d5 MS |
1619 | 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 | ||
2356f4cb MS |
1640 | /** |
1641 | * iucv_external_interrupt | |
1642 | * @code: irq code | |
1643 | * | |
1644 | * Handles external interrupts coming in from CP. | |
04b090d5 | 1645 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
2356f4cb MS |
1646 | */ |
1647 | static void iucv_external_interrupt(u16 code) | |
1648 | { | |
1649 | struct iucv_irq_data *p; | |
04b090d5 | 1650 | struct iucv_irq_list *work; |
2356f4cb | 1651 | |
70cf5035 | 1652 | p = iucv_irq_data[smp_processor_id()]; |
2356f4cb | 1653 | if (p->ippathid >= iucv_max_pathid) { |
c2b4afd2 | 1654 | WARN_ON(p->ippathid >= iucv_max_pathid); |
2356f4cb MS |
1655 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
1656 | return; | |
1657 | } | |
c2b4afd2 | 1658 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
04b090d5 | 1659 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
2356f4cb | 1660 | if (!work) { |
8f7c502c | 1661 | pr_warning("iucv_external_interrupt: out of memory\n"); |
2356f4cb MS |
1662 | return; |
1663 | } | |
1664 | memcpy(&work->data, p, sizeof(work->data)); | |
04b090d5 MS |
1665 | 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); | |
2356f4cb MS |
1676 | } |
1677 | ||
1678 | /** | |
1679 | * iucv_init | |
1680 | * | |
1681 | * Allocates and initializes various data structures. | |
1682 | */ | |
da99f056 | 1683 | static int __init iucv_init(void) |
2356f4cb MS |
1684 | { |
1685 | int rc; | |
70cf5035 | 1686 | int cpu; |
2356f4cb MS |
1687 | |
1688 | if (!MACHINE_IS_VM) { | |
1689 | rc = -EPROTONOSUPPORT; | |
1690 | goto out; | |
1691 | } | |
1692 | rc = iucv_query_maxconn(); | |
1693 | if (rc) | |
1694 | goto out; | |
da99f056 | 1695 | rc = register_external_interrupt(0x4000, iucv_external_interrupt); |
2356f4cb MS |
1696 | if (rc) |
1697 | goto out; | |
035da16f | 1698 | iucv_root = root_device_register("iucv"); |
2356f4cb MS |
1699 | if (IS_ERR(iucv_root)) { |
1700 | rc = PTR_ERR(iucv_root); | |
2d7bf367 | 1701 | goto out_int; |
2356f4cb | 1702 | } |
70cf5035 CL |
1703 | |
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 | } | |
2356f4cb | 1720 | } |
2d7bf367 CH |
1721 | rc = register_hotcpu_notifier(&iucv_cpu_notifier); |
1722 | if (rc) | |
1723 | goto out_free; | |
2356f4cb MS |
1724 | ASCEBC(iucv_error_no_listener, 16); |
1725 | ASCEBC(iucv_error_no_memory, 16); | |
1726 | ASCEBC(iucv_error_pathid, 16); | |
1727 | iucv_available = 1; | |
2d7bf367 CH |
1728 | rc = bus_register(&iucv_bus); |
1729 | if (rc) | |
1730 | goto out_cpu; | |
2356f4cb MS |
1731 | return 0; |
1732 | ||
2d7bf367 CH |
1733 | out_cpu: |
1734 | unregister_hotcpu_notifier(&iucv_cpu_notifier); | |
70cf5035 CL |
1735 | out_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 | } | |
035da16f | 1742 | root_device_unregister(iucv_root); |
2356f4cb MS |
1743 | out_int: |
1744 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
1745 | out: | |
1746 | return rc; | |
1747 | } | |
1748 | ||
1749 | /** | |
1750 | * iucv_exit | |
1751 | * | |
1752 | * Frees everything allocated from iucv_init. | |
1753 | */ | |
da99f056 | 1754 | static void __exit iucv_exit(void) |
2356f4cb | 1755 | { |
04b090d5 | 1756 | struct iucv_irq_list *p, *n; |
70cf5035 | 1757 | int cpu; |
2356f4cb | 1758 | |
04b090d5 MS |
1759 | spin_lock_irq(&iucv_queue_lock); |
1760 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) | |
1761 | kfree(p); | |
2356f4cb MS |
1762 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
1763 | kfree(p); | |
04b090d5 | 1764 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb | 1765 | unregister_hotcpu_notifier(&iucv_cpu_notifier); |
70cf5035 CL |
1766 | 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 | } | |
035da16f | 1772 | root_device_unregister(iucv_root); |
2356f4cb MS |
1773 | bus_unregister(&iucv_bus); |
1774 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
1775 | } | |
1776 | ||
1777 | subsys_initcall(iucv_init); | |
1778 | module_exit(iucv_exit); | |
1779 | ||
2356f4cb MS |
1780 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
1781 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); | |
1782 | MODULE_LICENSE("GPL"); |