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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 | ||
33 | #include <linux/module.h> | |
34 | #include <linux/moduleparam.h> | |
2356f4cb MS |
35 | #include <linux/spinlock.h> |
36 | #include <linux/kernel.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/list.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/err.h> | |
43 | #include <linux/device.h> | |
44 | #include <linux/cpu.h> | |
45 | #include <net/iucv/iucv.h> | |
46 | #include <asm/atomic.h> | |
47 | #include <asm/ebcdic.h> | |
48 | #include <asm/io.h> | |
49 | #include <asm/s390_ext.h> | |
50 | #include <asm/s390_rdev.h> | |
51 | #include <asm/smp.h> | |
52 | ||
53 | /* | |
54 | * FLAGS: | |
55 | * All flags are defined in the field IPFLAGS1 of each function | |
56 | * and can be found in CP Programming Services. | |
57 | * IPSRCCLS - Indicates you have specified a source class. | |
58 | * IPTRGCLS - Indicates you have specified a target class. | |
59 | * IPFGPID - Indicates you have specified a pathid. | |
60 | * IPFGMID - Indicates you have specified a message ID. | |
61 | * IPNORPY - Indicates a one-way message. No reply expected. | |
62 | * IPALL - Indicates that all paths are affected. | |
63 | */ | |
64 | #define IUCV_IPSRCCLS 0x01 | |
65 | #define IUCV_IPTRGCLS 0x01 | |
66 | #define IUCV_IPFGPID 0x02 | |
67 | #define IUCV_IPFGMID 0x04 | |
68 | #define IUCV_IPNORPY 0x10 | |
69 | #define IUCV_IPALL 0x80 | |
70 | ||
da99f056 | 71 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
2356f4cb MS |
72 | { |
73 | return 0; | |
74 | } | |
75 | ||
76 | struct bus_type iucv_bus = { | |
77 | .name = "iucv", | |
78 | .match = iucv_bus_match, | |
79 | }; | |
da99f056 | 80 | EXPORT_SYMBOL(iucv_bus); |
2356f4cb MS |
81 | |
82 | struct device *iucv_root; | |
da99f056 HC |
83 | EXPORT_SYMBOL(iucv_root); |
84 | ||
2356f4cb MS |
85 | static int iucv_available; |
86 | ||
87 | /* General IUCV interrupt structure */ | |
88 | struct iucv_irq_data { | |
89 | u16 ippathid; | |
90 | u8 ipflags1; | |
91 | u8 iptype; | |
92 | u32 res2[8]; | |
93 | }; | |
94 | ||
04b090d5 | 95 | struct iucv_irq_list { |
2356f4cb MS |
96 | struct list_head list; |
97 | struct iucv_irq_data data; | |
98 | }; | |
99 | ||
70cf5035 | 100 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
2356f4cb MS |
101 | static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE; |
102 | static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE; | |
103 | ||
04b090d5 MS |
104 | /* |
105 | * Queue of interrupt buffers lock for delivery via the tasklet | |
106 | * (fast but can't call smp_call_function). | |
107 | */ | |
108 | static LIST_HEAD(iucv_task_queue); | |
109 | ||
110 | /* | |
111 | * The tasklet for fast delivery of iucv interrupts. | |
112 | */ | |
113 | static void iucv_tasklet_fn(unsigned long); | |
114 | static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0); | |
115 | ||
116 | /* | |
117 | * Queue of interrupt buffers for delivery via a work queue | |
118 | * (slower but can call smp_call_function). | |
119 | */ | |
120 | static LIST_HEAD(iucv_work_queue); | |
121 | ||
122 | /* | |
123 | * The work element to deliver path pending interrupts. | |
124 | */ | |
125 | static void iucv_work_fn(struct work_struct *work); | |
126 | static DECLARE_WORK(iucv_work, iucv_work_fn); | |
127 | ||
128 | /* | |
129 | * Spinlock protecting task and work queue. | |
130 | */ | |
131 | static DEFINE_SPINLOCK(iucv_queue_lock); | |
2356f4cb MS |
132 | |
133 | enum iucv_command_codes { | |
134 | IUCV_QUERY = 0, | |
135 | IUCV_RETRIEVE_BUFFER = 2, | |
136 | IUCV_SEND = 4, | |
137 | IUCV_RECEIVE = 5, | |
138 | IUCV_REPLY = 6, | |
139 | IUCV_REJECT = 8, | |
140 | IUCV_PURGE = 9, | |
141 | IUCV_ACCEPT = 10, | |
142 | IUCV_CONNECT = 11, | |
143 | IUCV_DECLARE_BUFFER = 12, | |
144 | IUCV_QUIESCE = 13, | |
145 | IUCV_RESUME = 14, | |
146 | IUCV_SEVER = 15, | |
147 | IUCV_SETMASK = 16, | |
148 | }; | |
149 | ||
150 | /* | |
151 | * Error messages that are used with the iucv_sever function. They get | |
152 | * converted to EBCDIC. | |
153 | */ | |
154 | static char iucv_error_no_listener[16] = "NO LISTENER"; | |
155 | static char iucv_error_no_memory[16] = "NO MEMORY"; | |
156 | static char iucv_error_pathid[16] = "INVALID PATHID"; | |
157 | ||
158 | /* | |
159 | * iucv_handler_list: List of registered handlers. | |
160 | */ | |
161 | static LIST_HEAD(iucv_handler_list); | |
162 | ||
163 | /* | |
164 | * iucv_path_table: an array of iucv_path structures. | |
165 | */ | |
166 | static struct iucv_path **iucv_path_table; | |
167 | static unsigned long iucv_max_pathid; | |
168 | ||
169 | /* | |
170 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table | |
171 | */ | |
172 | static DEFINE_SPINLOCK(iucv_table_lock); | |
173 | ||
174 | /* | |
04b090d5 MS |
175 | * iucv_active_cpu: contains the number of the cpu executing the tasklet |
176 | * or the work handler. Needed for iucv_path_sever called from tasklet. | |
2356f4cb | 177 | */ |
04b090d5 | 178 | static int iucv_active_cpu = -1; |
2356f4cb MS |
179 | |
180 | /* | |
181 | * Mutex and wait queue for iucv_register/iucv_unregister. | |
182 | */ | |
183 | static DEFINE_MUTEX(iucv_register_mutex); | |
184 | ||
185 | /* | |
186 | * Counter for number of non-smp capable handlers. | |
187 | */ | |
188 | static int iucv_nonsmp_handler; | |
189 | ||
190 | /* | |
191 | * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, | |
192 | * iucv_path_quiesce and iucv_path_sever. | |
193 | */ | |
194 | struct iucv_cmd_control { | |
195 | u16 ippathid; | |
196 | u8 ipflags1; | |
197 | u8 iprcode; | |
198 | u16 ipmsglim; | |
199 | u16 res1; | |
200 | u8 ipvmid[8]; | |
201 | u8 ipuser[16]; | |
202 | u8 iptarget[8]; | |
203 | } __attribute__ ((packed,aligned(8))); | |
204 | ||
205 | /* | |
206 | * Data in parameter list iucv structure. Used by iucv_message_send, | |
207 | * iucv_message_send2way and iucv_message_reply. | |
208 | */ | |
209 | struct iucv_cmd_dpl { | |
210 | u16 ippathid; | |
211 | u8 ipflags1; | |
212 | u8 iprcode; | |
213 | u32 ipmsgid; | |
214 | u32 iptrgcls; | |
215 | u8 iprmmsg[8]; | |
216 | u32 ipsrccls; | |
217 | u32 ipmsgtag; | |
218 | u32 ipbfadr2; | |
219 | u32 ipbfln2f; | |
220 | u32 res; | |
221 | } __attribute__ ((packed,aligned(8))); | |
222 | ||
223 | /* | |
224 | * Data in buffer iucv structure. Used by iucv_message_receive, | |
225 | * iucv_message_reject, iucv_message_send, iucv_message_send2way | |
226 | * and iucv_declare_cpu. | |
227 | */ | |
228 | struct iucv_cmd_db { | |
229 | u16 ippathid; | |
230 | u8 ipflags1; | |
231 | u8 iprcode; | |
232 | u32 ipmsgid; | |
233 | u32 iptrgcls; | |
234 | u32 ipbfadr1; | |
235 | u32 ipbfln1f; | |
236 | u32 ipsrccls; | |
237 | u32 ipmsgtag; | |
238 | u32 ipbfadr2; | |
239 | u32 ipbfln2f; | |
240 | u32 res; | |
241 | } __attribute__ ((packed,aligned(8))); | |
242 | ||
243 | /* | |
244 | * Purge message iucv structure. Used by iucv_message_purge. | |
245 | */ | |
246 | struct iucv_cmd_purge { | |
247 | u16 ippathid; | |
248 | u8 ipflags1; | |
249 | u8 iprcode; | |
250 | u32 ipmsgid; | |
251 | u8 ipaudit[3]; | |
252 | u8 res1[5]; | |
253 | u32 res2; | |
254 | u32 ipsrccls; | |
255 | u32 ipmsgtag; | |
256 | u32 res3[3]; | |
257 | } __attribute__ ((packed,aligned(8))); | |
258 | ||
259 | /* | |
260 | * Set mask iucv structure. Used by iucv_enable_cpu. | |
261 | */ | |
262 | struct iucv_cmd_set_mask { | |
263 | u8 ipmask; | |
264 | u8 res1[2]; | |
265 | u8 iprcode; | |
266 | u32 res2[9]; | |
267 | } __attribute__ ((packed,aligned(8))); | |
268 | ||
269 | union iucv_param { | |
270 | struct iucv_cmd_control ctrl; | |
271 | struct iucv_cmd_dpl dpl; | |
272 | struct iucv_cmd_db db; | |
273 | struct iucv_cmd_purge purge; | |
274 | struct iucv_cmd_set_mask set_mask; | |
275 | }; | |
276 | ||
277 | /* | |
278 | * Anchor for per-cpu IUCV command parameter block. | |
279 | */ | |
70cf5035 | 280 | static union iucv_param *iucv_param[NR_CPUS]; |
2356f4cb MS |
281 | |
282 | /** | |
283 | * iucv_call_b2f0 | |
284 | * @code: identifier of IUCV call to CP. | |
285 | * @parm: pointer to a struct iucv_parm block | |
286 | * | |
287 | * Calls CP to execute IUCV commands. | |
288 | * | |
289 | * Returns the result of the CP IUCV call. | |
290 | */ | |
291 | static inline int iucv_call_b2f0(int command, union iucv_param *parm) | |
292 | { | |
293 | register unsigned long reg0 asm ("0"); | |
294 | register unsigned long reg1 asm ("1"); | |
295 | int ccode; | |
296 | ||
297 | reg0 = command; | |
298 | reg1 = virt_to_phys(parm); | |
299 | asm volatile( | |
300 | " .long 0xb2f01000\n" | |
301 | " ipm %0\n" | |
302 | " srl %0,28\n" | |
303 | : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1) | |
304 | : "m" (*parm) : "cc"); | |
305 | return (ccode == 1) ? parm->ctrl.iprcode : ccode; | |
306 | } | |
307 | ||
308 | /** | |
309 | * iucv_query_maxconn | |
310 | * | |
311 | * Determines the maximum number of connections that may be established. | |
312 | * | |
313 | * Returns the maximum number of connections or -EPERM is IUCV is not | |
314 | * available. | |
315 | */ | |
316 | static int iucv_query_maxconn(void) | |
317 | { | |
318 | register unsigned long reg0 asm ("0"); | |
319 | register unsigned long reg1 asm ("1"); | |
320 | void *param; | |
321 | int ccode; | |
322 | ||
323 | param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA); | |
324 | if (!param) | |
325 | return -ENOMEM; | |
326 | reg0 = IUCV_QUERY; | |
327 | reg1 = (unsigned long) param; | |
328 | asm volatile ( | |
329 | " .long 0xb2f01000\n" | |
330 | " ipm %0\n" | |
331 | " srl %0,28\n" | |
332 | : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc"); | |
333 | if (ccode == 0) | |
334 | iucv_max_pathid = reg0; | |
335 | kfree(param); | |
336 | return ccode ? -EPERM : 0; | |
337 | } | |
338 | ||
339 | /** | |
340 | * iucv_allow_cpu | |
341 | * @data: unused | |
342 | * | |
343 | * Allow iucv interrupts on this cpu. | |
344 | */ | |
345 | static void iucv_allow_cpu(void *data) | |
346 | { | |
347 | int cpu = smp_processor_id(); | |
348 | union iucv_param *parm; | |
349 | ||
350 | /* | |
351 | * Enable all iucv interrupts. | |
352 | * ipmask contains bits for the different interrupts | |
353 | * 0x80 - Flag to allow nonpriority message pending interrupts | |
354 | * 0x40 - Flag to allow priority message pending interrupts | |
355 | * 0x20 - Flag to allow nonpriority message completion interrupts | |
356 | * 0x10 - Flag to allow priority message completion interrupts | |
357 | * 0x08 - Flag to allow IUCV control interrupts | |
358 | */ | |
70cf5035 | 359 | parm = iucv_param[cpu]; |
2356f4cb MS |
360 | memset(parm, 0, sizeof(union iucv_param)); |
361 | parm->set_mask.ipmask = 0xf8; | |
362 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
363 | ||
364 | /* Set indication that iucv interrupts are allowed for this cpu. */ | |
365 | cpu_set(cpu, iucv_irq_cpumask); | |
366 | } | |
367 | ||
368 | /** | |
369 | * iucv_block_cpu | |
370 | * @data: unused | |
371 | * | |
372 | * Block iucv interrupts on this cpu. | |
373 | */ | |
374 | static void iucv_block_cpu(void *data) | |
375 | { | |
376 | int cpu = smp_processor_id(); | |
377 | union iucv_param *parm; | |
378 | ||
379 | /* Disable all iucv interrupts. */ | |
70cf5035 | 380 | parm = iucv_param[cpu]; |
2356f4cb MS |
381 | memset(parm, 0, sizeof(union iucv_param)); |
382 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
383 | ||
384 | /* Clear indication that iucv interrupts are allowed for this cpu. */ | |
385 | cpu_clear(cpu, iucv_irq_cpumask); | |
386 | } | |
387 | ||
388 | /** | |
389 | * iucv_declare_cpu | |
390 | * @data: unused | |
391 | * | |
3a4fa0a2 | 392 | * Declare a interrupt buffer on this cpu. |
2356f4cb MS |
393 | */ |
394 | static void iucv_declare_cpu(void *data) | |
395 | { | |
396 | int cpu = smp_processor_id(); | |
397 | union iucv_param *parm; | |
398 | int rc; | |
399 | ||
400 | if (cpu_isset(cpu, iucv_buffer_cpumask)) | |
401 | return; | |
402 | ||
403 | /* Declare interrupt buffer. */ | |
70cf5035 | 404 | parm = iucv_param[cpu]; |
2356f4cb | 405 | memset(parm, 0, sizeof(union iucv_param)); |
70cf5035 | 406 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
2356f4cb MS |
407 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
408 | if (rc) { | |
409 | char *err = "Unknown"; | |
da99f056 | 410 | switch (rc) { |
2356f4cb MS |
411 | case 0x03: |
412 | err = "Directory error"; | |
413 | break; | |
414 | case 0x0a: | |
415 | err = "Invalid length"; | |
416 | break; | |
417 | case 0x13: | |
418 | err = "Buffer already exists"; | |
419 | break; | |
420 | case 0x3e: | |
421 | err = "Buffer overlap"; | |
422 | break; | |
423 | case 0x5c: | |
424 | err = "Paging or storage error"; | |
425 | break; | |
426 | } | |
427 | printk(KERN_WARNING "iucv_register: iucv_declare_buffer " | |
428 | "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err); | |
429 | return; | |
430 | } | |
431 | ||
432 | /* Set indication that an iucv buffer exists for this cpu. */ | |
433 | cpu_set(cpu, iucv_buffer_cpumask); | |
434 | ||
435 | if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask)) | |
436 | /* Enable iucv interrupts on this cpu. */ | |
437 | iucv_allow_cpu(NULL); | |
438 | else | |
439 | /* Disable iucv interrupts on this cpu. */ | |
440 | iucv_block_cpu(NULL); | |
441 | } | |
442 | ||
443 | /** | |
444 | * iucv_retrieve_cpu | |
445 | * @data: unused | |
446 | * | |
447 | * Retrieve interrupt buffer on this cpu. | |
448 | */ | |
449 | static void iucv_retrieve_cpu(void *data) | |
450 | { | |
451 | int cpu = smp_processor_id(); | |
452 | union iucv_param *parm; | |
453 | ||
454 | if (!cpu_isset(cpu, iucv_buffer_cpumask)) | |
455 | return; | |
456 | ||
457 | /* Block iucv interrupts. */ | |
458 | iucv_block_cpu(NULL); | |
459 | ||
460 | /* Retrieve interrupt buffer. */ | |
70cf5035 | 461 | parm = iucv_param[cpu]; |
2356f4cb MS |
462 | iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); |
463 | ||
464 | /* Clear indication that an iucv buffer exists for this cpu. */ | |
465 | cpu_clear(cpu, iucv_buffer_cpumask); | |
466 | } | |
467 | ||
468 | /** | |
469 | * iucv_setmask_smp | |
470 | * | |
471 | * Allow iucv interrupts on all cpus. | |
472 | */ | |
473 | static void iucv_setmask_mp(void) | |
474 | { | |
475 | int cpu; | |
476 | ||
7b9d1b22 | 477 | get_online_cpus(); |
2356f4cb MS |
478 | for_each_online_cpu(cpu) |
479 | /* Enable all cpus with a declared buffer. */ | |
480 | if (cpu_isset(cpu, iucv_buffer_cpumask) && | |
481 | !cpu_isset(cpu, iucv_irq_cpumask)) | |
3bb447fc | 482 | smp_call_function_single(cpu, iucv_allow_cpu, |
8691e5a8 | 483 | NULL, 1); |
7b9d1b22 | 484 | put_online_cpus(); |
2356f4cb MS |
485 | } |
486 | ||
487 | /** | |
488 | * iucv_setmask_up | |
489 | * | |
04b090d5 | 490 | * Allow iucv interrupts on a single cpu. |
2356f4cb MS |
491 | */ |
492 | static void iucv_setmask_up(void) | |
493 | { | |
494 | cpumask_t cpumask; | |
495 | int cpu; | |
496 | ||
497 | /* Disable all cpu but the first in cpu_irq_cpumask. */ | |
498 | cpumask = iucv_irq_cpumask; | |
499 | cpu_clear(first_cpu(iucv_irq_cpumask), cpumask); | |
0e12f848 | 500 | for_each_cpu_mask_nr(cpu, cpumask) |
8691e5a8 | 501 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
2356f4cb MS |
502 | } |
503 | ||
504 | /** | |
505 | * iucv_enable | |
506 | * | |
507 | * This function makes iucv ready for use. It allocates the pathid | |
508 | * table, declares an iucv interrupt buffer and enables the iucv | |
509 | * interrupts. Called when the first user has registered an iucv | |
510 | * handler. | |
511 | */ | |
512 | static int iucv_enable(void) | |
513 | { | |
514 | size_t alloc_size; | |
515 | int cpu, rc; | |
516 | ||
517 | rc = -ENOMEM; | |
518 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); | |
519 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); | |
520 | if (!iucv_path_table) | |
521 | goto out; | |
522 | /* Declare per cpu buffers. */ | |
523 | rc = -EIO; | |
7b9d1b22 | 524 | get_online_cpus(); |
2356f4cb | 525 | for_each_online_cpu(cpu) |
8691e5a8 | 526 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
527 | if (cpus_empty(iucv_buffer_cpumask)) |
528 | /* No cpu could declare an iucv buffer. */ | |
529 | goto out_path; | |
7b9d1b22 | 530 | put_online_cpus(); |
2356f4cb MS |
531 | return 0; |
532 | ||
533 | out_path: | |
7b9d1b22 | 534 | put_online_cpus(); |
2356f4cb MS |
535 | kfree(iucv_path_table); |
536 | out: | |
537 | return rc; | |
538 | } | |
539 | ||
540 | /** | |
541 | * iucv_disable | |
542 | * | |
543 | * This function shuts down iucv. It disables iucv interrupts, retrieves | |
544 | * the iucv interrupt buffer and frees the pathid table. Called after the | |
545 | * last user unregister its iucv handler. | |
546 | */ | |
547 | static void iucv_disable(void) | |
548 | { | |
8b122efd | 549 | get_online_cpus(); |
15c8b6c1 | 550 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
8b122efd | 551 | put_online_cpus(); |
2356f4cb MS |
552 | kfree(iucv_path_table); |
553 | } | |
554 | ||
2356f4cb MS |
555 | static int __cpuinit iucv_cpu_notify(struct notifier_block *self, |
556 | unsigned long action, void *hcpu) | |
557 | { | |
558 | cpumask_t cpumask; | |
559 | long cpu = (long) hcpu; | |
560 | ||
561 | switch (action) { | |
562 | case CPU_UP_PREPARE: | |
8bb78442 | 563 | case CPU_UP_PREPARE_FROZEN: |
70cf5035 CL |
564 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), |
565 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
566 | if (!iucv_irq_data[cpu]) | |
2356f4cb | 567 | return NOTIFY_BAD; |
70cf5035 CL |
568 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
569 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
d0236f8f AM |
570 | if (!iucv_param[cpu]) { |
571 | kfree(iucv_irq_data[cpu]); | |
572 | iucv_irq_data[cpu] = NULL; | |
2356f4cb | 573 | return NOTIFY_BAD; |
d0236f8f | 574 | } |
2356f4cb MS |
575 | break; |
576 | case CPU_UP_CANCELED: | |
8bb78442 | 577 | case CPU_UP_CANCELED_FROZEN: |
2356f4cb | 578 | case CPU_DEAD: |
8bb78442 | 579 | case CPU_DEAD_FROZEN: |
70cf5035 CL |
580 | kfree(iucv_param[cpu]); |
581 | iucv_param[cpu] = NULL; | |
582 | kfree(iucv_irq_data[cpu]); | |
583 | iucv_irq_data[cpu] = NULL; | |
2356f4cb MS |
584 | break; |
585 | case CPU_ONLINE: | |
8bb78442 | 586 | case CPU_ONLINE_FROZEN: |
2356f4cb | 587 | case CPU_DOWN_FAILED: |
8bb78442 | 588 | case CPU_DOWN_FAILED_FROZEN: |
8691e5a8 | 589 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
590 | break; |
591 | case CPU_DOWN_PREPARE: | |
8bb78442 | 592 | case CPU_DOWN_PREPARE_FROZEN: |
2356f4cb MS |
593 | cpumask = iucv_buffer_cpumask; |
594 | cpu_clear(cpu, cpumask); | |
595 | if (cpus_empty(cpumask)) | |
596 | /* Can't offline last IUCV enabled cpu. */ | |
597 | return NOTIFY_BAD; | |
8691e5a8 | 598 | smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 599 | if (cpus_empty(iucv_irq_cpumask)) |
3bb447fc | 600 | smp_call_function_single(first_cpu(iucv_buffer_cpumask), |
8691e5a8 | 601 | iucv_allow_cpu, NULL, 1); |
2356f4cb MS |
602 | break; |
603 | } | |
604 | return NOTIFY_OK; | |
605 | } | |
606 | ||
f1494ed1 | 607 | static struct notifier_block __refdata iucv_cpu_notifier = { |
2356f4cb MS |
608 | .notifier_call = iucv_cpu_notify, |
609 | }; | |
2356f4cb MS |
610 | |
611 | /** | |
612 | * iucv_sever_pathid | |
613 | * @pathid: path identification number. | |
614 | * @userdata: 16-bytes of user data. | |
615 | * | |
616 | * Sever an iucv path to free up the pathid. Used internally. | |
617 | */ | |
618 | static int iucv_sever_pathid(u16 pathid, u8 userdata[16]) | |
619 | { | |
620 | union iucv_param *parm; | |
621 | ||
70cf5035 | 622 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
623 | memset(parm, 0, sizeof(union iucv_param)); |
624 | if (userdata) | |
625 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
626 | parm->ctrl.ippathid = pathid; | |
627 | return iucv_call_b2f0(IUCV_SEVER, parm); | |
628 | } | |
629 | ||
630 | /** | |
04b090d5 | 631 | * __iucv_cleanup_queue |
2356f4cb MS |
632 | * @dummy: unused dummy argument |
633 | * | |
634 | * Nop function called via smp_call_function to force work items from | |
635 | * pending external iucv interrupts to the work queue. | |
636 | */ | |
04b090d5 | 637 | static void __iucv_cleanup_queue(void *dummy) |
2356f4cb MS |
638 | { |
639 | } | |
640 | ||
641 | /** | |
04b090d5 | 642 | * iucv_cleanup_queue |
2356f4cb MS |
643 | * |
644 | * Function called after a path has been severed to find all remaining | |
645 | * work items for the now stale pathid. The caller needs to hold the | |
646 | * iucv_table_lock. | |
647 | */ | |
04b090d5 | 648 | static void iucv_cleanup_queue(void) |
2356f4cb | 649 | { |
04b090d5 | 650 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
651 | |
652 | /* | |
04b090d5 MS |
653 | * When a path is severed, the pathid can be reused immediatly |
654 | * on a iucv connect or a connection pending interrupt. Remove | |
655 | * all entries from the task queue that refer to a stale pathid | |
656 | * (iucv_path_table[ix] == NULL). Only then do the iucv connect | |
657 | * or deliver the connection pending interrupt. To get all the | |
658 | * pending interrupts force them to the work queue by calling | |
659 | * an empty function on all cpus. | |
2356f4cb | 660 | */ |
8691e5a8 | 661 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
04b090d5 MS |
662 | spin_lock_irq(&iucv_queue_lock); |
663 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) { | |
664 | /* Remove stale work items from the task queue. */ | |
665 | if (iucv_path_table[p->data.ippathid] == NULL) { | |
2356f4cb MS |
666 | list_del(&p->list); |
667 | kfree(p); | |
668 | } | |
669 | } | |
04b090d5 | 670 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb MS |
671 | } |
672 | ||
673 | /** | |
674 | * iucv_register: | |
675 | * @handler: address of iucv handler structure | |
676 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
677 | * | |
678 | * Registers a driver with IUCV. | |
679 | * | |
680 | * Returns 0 on success, -ENOMEM if the memory allocation for the pathid | |
681 | * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. | |
682 | */ | |
683 | int iucv_register(struct iucv_handler *handler, int smp) | |
684 | { | |
685 | int rc; | |
686 | ||
687 | if (!iucv_available) | |
688 | return -ENOSYS; | |
689 | mutex_lock(&iucv_register_mutex); | |
690 | if (!smp) | |
691 | iucv_nonsmp_handler++; | |
692 | if (list_empty(&iucv_handler_list)) { | |
693 | rc = iucv_enable(); | |
694 | if (rc) | |
695 | goto out_mutex; | |
696 | } else if (!smp && iucv_nonsmp_handler == 1) | |
697 | iucv_setmask_up(); | |
698 | INIT_LIST_HEAD(&handler->paths); | |
699 | ||
435bc9df | 700 | spin_lock_bh(&iucv_table_lock); |
2356f4cb | 701 | list_add_tail(&handler->list, &iucv_handler_list); |
435bc9df | 702 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
703 | rc = 0; |
704 | out_mutex: | |
705 | mutex_unlock(&iucv_register_mutex); | |
706 | return rc; | |
707 | } | |
da99f056 | 708 | EXPORT_SYMBOL(iucv_register); |
2356f4cb MS |
709 | |
710 | /** | |
711 | * iucv_unregister | |
712 | * @handler: address of iucv handler structure | |
713 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
714 | * | |
715 | * Unregister driver from IUCV. | |
716 | */ | |
717 | void iucv_unregister(struct iucv_handler *handler, int smp) | |
718 | { | |
719 | struct iucv_path *p, *n; | |
720 | ||
721 | mutex_lock(&iucv_register_mutex); | |
722 | spin_lock_bh(&iucv_table_lock); | |
723 | /* Remove handler from the iucv_handler_list. */ | |
724 | list_del_init(&handler->list); | |
725 | /* Sever all pathids still refering to the handler. */ | |
726 | list_for_each_entry_safe(p, n, &handler->paths, list) { | |
727 | iucv_sever_pathid(p->pathid, NULL); | |
728 | iucv_path_table[p->pathid] = NULL; | |
729 | list_del(&p->list); | |
2356f4cb MS |
730 | iucv_path_free(p); |
731 | } | |
732 | spin_unlock_bh(&iucv_table_lock); | |
733 | if (!smp) | |
734 | iucv_nonsmp_handler--; | |
735 | if (list_empty(&iucv_handler_list)) | |
736 | iucv_disable(); | |
737 | else if (!smp && iucv_nonsmp_handler == 0) | |
738 | iucv_setmask_mp(); | |
739 | mutex_unlock(&iucv_register_mutex); | |
740 | } | |
da99f056 | 741 | EXPORT_SYMBOL(iucv_unregister); |
2356f4cb MS |
742 | |
743 | /** | |
744 | * iucv_path_accept | |
745 | * @path: address of iucv path structure | |
746 | * @handler: address of iucv handler structure | |
747 | * @userdata: 16 bytes of data reflected to the communication partner | |
748 | * @private: private data passed to interrupt handlers for this path | |
749 | * | |
750 | * This function is issued after the user received a connection pending | |
751 | * external interrupt and now wishes to complete the IUCV communication path. | |
752 | * | |
753 | * Returns the result of the CP IUCV call. | |
754 | */ | |
755 | int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, | |
756 | u8 userdata[16], void *private) | |
757 | { | |
758 | union iucv_param *parm; | |
759 | int rc; | |
760 | ||
761 | local_bh_disable(); | |
762 | /* Prepare parameter block. */ | |
70cf5035 | 763 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
764 | memset(parm, 0, sizeof(union iucv_param)); |
765 | parm->ctrl.ippathid = path->pathid; | |
766 | parm->ctrl.ipmsglim = path->msglim; | |
767 | if (userdata) | |
768 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
769 | parm->ctrl.ipflags1 = path->flags; | |
770 | ||
771 | rc = iucv_call_b2f0(IUCV_ACCEPT, parm); | |
772 | if (!rc) { | |
773 | path->private = private; | |
774 | path->msglim = parm->ctrl.ipmsglim; | |
775 | path->flags = parm->ctrl.ipflags1; | |
776 | } | |
777 | local_bh_enable(); | |
778 | return rc; | |
779 | } | |
da99f056 | 780 | EXPORT_SYMBOL(iucv_path_accept); |
2356f4cb MS |
781 | |
782 | /** | |
783 | * iucv_path_connect | |
784 | * @path: address of iucv path structure | |
785 | * @handler: address of iucv handler structure | |
786 | * @userid: 8-byte user identification | |
787 | * @system: 8-byte target system identification | |
788 | * @userdata: 16 bytes of data reflected to the communication partner | |
789 | * @private: private data passed to interrupt handlers for this path | |
790 | * | |
791 | * This function establishes an IUCV path. Although the connect may complete | |
792 | * successfully, you are not able to use the path until you receive an IUCV | |
793 | * Connection Complete external interrupt. | |
794 | * | |
795 | * Returns the result of the CP IUCV call. | |
796 | */ | |
797 | int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, | |
798 | u8 userid[8], u8 system[8], u8 userdata[16], | |
799 | void *private) | |
800 | { | |
801 | union iucv_param *parm; | |
802 | int rc; | |
803 | ||
04b090d5 MS |
804 | spin_lock_bh(&iucv_table_lock); |
805 | iucv_cleanup_queue(); | |
70cf5035 | 806 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
807 | memset(parm, 0, sizeof(union iucv_param)); |
808 | parm->ctrl.ipmsglim = path->msglim; | |
809 | parm->ctrl.ipflags1 = path->flags; | |
810 | if (userid) { | |
811 | memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); | |
812 | ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
813 | EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
814 | } | |
815 | if (system) { | |
816 | memcpy(parm->ctrl.iptarget, system, | |
817 | sizeof(parm->ctrl.iptarget)); | |
818 | ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
819 | EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
820 | } | |
821 | if (userdata) | |
822 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
823 | ||
824 | rc = iucv_call_b2f0(IUCV_CONNECT, parm); | |
825 | if (!rc) { | |
826 | if (parm->ctrl.ippathid < iucv_max_pathid) { | |
827 | path->pathid = parm->ctrl.ippathid; | |
828 | path->msglim = parm->ctrl.ipmsglim; | |
829 | path->flags = parm->ctrl.ipflags1; | |
830 | path->handler = handler; | |
831 | path->private = private; | |
832 | list_add_tail(&path->list, &handler->paths); | |
833 | iucv_path_table[path->pathid] = path; | |
834 | } else { | |
835 | iucv_sever_pathid(parm->ctrl.ippathid, | |
836 | iucv_error_pathid); | |
837 | rc = -EIO; | |
838 | } | |
839 | } | |
04b090d5 | 840 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
841 | return rc; |
842 | } | |
da99f056 | 843 | EXPORT_SYMBOL(iucv_path_connect); |
2356f4cb MS |
844 | |
845 | /** | |
846 | * iucv_path_quiesce: | |
847 | * @path: address of iucv path structure | |
848 | * @userdata: 16 bytes of data reflected to the communication partner | |
849 | * | |
850 | * This function temporarily suspends incoming messages on an IUCV path. | |
851 | * You can later reactivate the path by invoking the iucv_resume function. | |
852 | * | |
853 | * Returns the result from the CP IUCV call. | |
854 | */ | |
855 | int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]) | |
856 | { | |
857 | union iucv_param *parm; | |
858 | int rc; | |
859 | ||
860 | local_bh_disable(); | |
70cf5035 | 861 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
862 | memset(parm, 0, sizeof(union iucv_param)); |
863 | if (userdata) | |
864 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
865 | parm->ctrl.ippathid = path->pathid; | |
866 | rc = iucv_call_b2f0(IUCV_QUIESCE, parm); | |
867 | local_bh_enable(); | |
868 | return rc; | |
869 | } | |
da99f056 | 870 | EXPORT_SYMBOL(iucv_path_quiesce); |
2356f4cb MS |
871 | |
872 | /** | |
873 | * iucv_path_resume: | |
874 | * @path: address of iucv path structure | |
875 | * @userdata: 16 bytes of data reflected to the communication partner | |
876 | * | |
877 | * This function resumes incoming messages on an IUCV path that has | |
878 | * been stopped with iucv_path_quiesce. | |
879 | * | |
880 | * Returns the result from the CP IUCV call. | |
881 | */ | |
882 | int iucv_path_resume(struct iucv_path *path, u8 userdata[16]) | |
883 | { | |
884 | union iucv_param *parm; | |
885 | int rc; | |
886 | ||
887 | local_bh_disable(); | |
70cf5035 | 888 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
889 | memset(parm, 0, sizeof(union iucv_param)); |
890 | if (userdata) | |
891 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
892 | parm->ctrl.ippathid = path->pathid; | |
893 | rc = iucv_call_b2f0(IUCV_RESUME, parm); | |
894 | local_bh_enable(); | |
895 | return rc; | |
896 | } | |
897 | ||
898 | /** | |
899 | * iucv_path_sever | |
900 | * @path: address of iucv path structure | |
901 | * @userdata: 16 bytes of data reflected to the communication partner | |
902 | * | |
903 | * This function terminates an IUCV path. | |
904 | * | |
905 | * Returns the result from the CP IUCV call. | |
906 | */ | |
907 | int iucv_path_sever(struct iucv_path *path, u8 userdata[16]) | |
908 | { | |
909 | int rc; | |
910 | ||
2356f4cb | 911 | preempt_disable(); |
04b090d5 | 912 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
913 | spin_lock_bh(&iucv_table_lock); |
914 | rc = iucv_sever_pathid(path->pathid, userdata); | |
915 | if (!rc) { | |
916 | iucv_path_table[path->pathid] = NULL; | |
917 | list_del_init(&path->list); | |
2356f4cb | 918 | } |
04b090d5 | 919 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
920 | spin_unlock_bh(&iucv_table_lock); |
921 | preempt_enable(); | |
922 | return rc; | |
923 | } | |
da99f056 | 924 | EXPORT_SYMBOL(iucv_path_sever); |
2356f4cb MS |
925 | |
926 | /** | |
927 | * iucv_message_purge | |
928 | * @path: address of iucv path structure | |
929 | * @msg: address of iucv msg structure | |
930 | * @srccls: source class of message | |
931 | * | |
932 | * Cancels a message you have sent. | |
933 | * | |
934 | * Returns the result from the CP IUCV call. | |
935 | */ | |
936 | int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, | |
937 | u32 srccls) | |
938 | { | |
939 | union iucv_param *parm; | |
940 | int rc; | |
941 | ||
942 | local_bh_disable(); | |
70cf5035 | 943 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
944 | memset(parm, 0, sizeof(union iucv_param)); |
945 | parm->purge.ippathid = path->pathid; | |
946 | parm->purge.ipmsgid = msg->id; | |
947 | parm->purge.ipsrccls = srccls; | |
948 | parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; | |
949 | rc = iucv_call_b2f0(IUCV_PURGE, parm); | |
950 | if (!rc) { | |
951 | msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; | |
952 | msg->tag = parm->purge.ipmsgtag; | |
953 | } | |
954 | local_bh_enable(); | |
955 | return rc; | |
956 | } | |
da99f056 | 957 | EXPORT_SYMBOL(iucv_message_purge); |
2356f4cb MS |
958 | |
959 | /** | |
91d5d45e HB |
960 | * iucv_message_receive_iprmdata |
961 | * @path: address of iucv path structure | |
962 | * @msg: address of iucv msg structure | |
963 | * @flags: how the message is received (IUCV_IPBUFLST) | |
964 | * @buffer: address of data buffer or address of struct iucv_array | |
965 | * @size: length of data buffer | |
966 | * @residual: | |
967 | * | |
968 | * Internal function used by iucv_message_receive and __iucv_message_receive | |
969 | * to receive RMDATA data stored in struct iucv_message. | |
970 | */ | |
971 | static int iucv_message_receive_iprmdata(struct iucv_path *path, | |
972 | struct iucv_message *msg, | |
973 | u8 flags, void *buffer, | |
974 | size_t size, size_t *residual) | |
975 | { | |
976 | struct iucv_array *array; | |
977 | u8 *rmmsg; | |
978 | size_t copy; | |
979 | ||
980 | /* | |
981 | * Message is 8 bytes long and has been stored to the | |
982 | * message descriptor itself. | |
983 | */ | |
984 | if (residual) | |
985 | *residual = abs(size - 8); | |
986 | rmmsg = msg->rmmsg; | |
987 | if (flags & IUCV_IPBUFLST) { | |
988 | /* Copy to struct iucv_array. */ | |
989 | size = (size < 8) ? size : 8; | |
990 | for (array = buffer; size > 0; array++) { | |
991 | copy = min_t(size_t, size, array->length); | |
992 | memcpy((u8 *)(addr_t) array->address, | |
993 | rmmsg, copy); | |
994 | rmmsg += copy; | |
995 | size -= copy; | |
996 | } | |
997 | } else { | |
998 | /* Copy to direct buffer. */ | |
999 | memcpy(buffer, rmmsg, min_t(size_t, size, 8)); | |
1000 | } | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * __iucv_message_receive | |
2356f4cb MS |
1006 | * @path: address of iucv path structure |
1007 | * @msg: address of iucv msg structure | |
1008 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1009 | * @buffer: address of data buffer or address of struct iucv_array | |
1010 | * @size: length of data buffer | |
1011 | * @residual: | |
1012 | * | |
1013 | * This function receives messages that are being sent to you over | |
1014 | * established paths. This function will deal with RMDATA messages | |
1015 | * embedded in struct iucv_message as well. | |
1016 | * | |
91d5d45e HB |
1017 | * Locking: no locking |
1018 | * | |
2356f4cb MS |
1019 | * Returns the result from the CP IUCV call. |
1020 | */ | |
91d5d45e HB |
1021 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1022 | u8 flags, void *buffer, size_t size, size_t *residual) | |
2356f4cb MS |
1023 | { |
1024 | union iucv_param *parm; | |
2356f4cb MS |
1025 | int rc; |
1026 | ||
91d5d45e HB |
1027 | if (msg->flags & IUCV_IPRMDATA) |
1028 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1029 | buffer, size, residual); | |
70cf5035 | 1030 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1031 | memset(parm, 0, sizeof(union iucv_param)); |
1032 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1033 | parm->db.ipbfln1f = (u32) size; | |
1034 | parm->db.ipmsgid = msg->id; | |
1035 | parm->db.ippathid = path->pathid; | |
1036 | parm->db.iptrgcls = msg->class; | |
1037 | parm->db.ipflags1 = (flags | IUCV_IPFGPID | | |
1038 | IUCV_IPFGMID | IUCV_IPTRGCLS); | |
1039 | rc = iucv_call_b2f0(IUCV_RECEIVE, parm); | |
1040 | if (!rc || rc == 5) { | |
1041 | msg->flags = parm->db.ipflags1; | |
1042 | if (residual) | |
1043 | *residual = parm->db.ipbfln1f; | |
1044 | } | |
91d5d45e HB |
1045 | return rc; |
1046 | } | |
1047 | EXPORT_SYMBOL(__iucv_message_receive); | |
1048 | ||
1049 | /** | |
1050 | * iucv_message_receive | |
1051 | * @path: address of iucv path structure | |
1052 | * @msg: address of iucv msg structure | |
1053 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1054 | * @buffer: address of data buffer or address of struct iucv_array | |
1055 | * @size: length of data buffer | |
1056 | * @residual: | |
1057 | * | |
1058 | * This function receives messages that are being sent to you over | |
1059 | * established paths. This function will deal with RMDATA messages | |
1060 | * embedded in struct iucv_message as well. | |
1061 | * | |
1062 | * Locking: local_bh_enable/local_bh_disable | |
1063 | * | |
1064 | * Returns the result from the CP IUCV call. | |
1065 | */ | |
1066 | int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, | |
1067 | u8 flags, void *buffer, size_t size, size_t *residual) | |
1068 | { | |
1069 | int rc; | |
1070 | ||
1071 | if (msg->flags & IUCV_IPRMDATA) | |
1072 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1073 | buffer, size, residual); | |
1074 | local_bh_disable(); | |
1075 | rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); | |
2356f4cb MS |
1076 | local_bh_enable(); |
1077 | return rc; | |
1078 | } | |
da99f056 | 1079 | EXPORT_SYMBOL(iucv_message_receive); |
2356f4cb MS |
1080 | |
1081 | /** | |
1082 | * iucv_message_reject | |
1083 | * @path: address of iucv path structure | |
1084 | * @msg: address of iucv msg structure | |
1085 | * | |
1086 | * The reject function refuses a specified message. Between the time you | |
1087 | * are notified of a message and the time that you complete the message, | |
1088 | * the message may be rejected. | |
1089 | * | |
1090 | * Returns the result from the CP IUCV call. | |
1091 | */ | |
1092 | int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) | |
1093 | { | |
1094 | union iucv_param *parm; | |
1095 | int rc; | |
1096 | ||
1097 | local_bh_disable(); | |
70cf5035 | 1098 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1099 | memset(parm, 0, sizeof(union iucv_param)); |
1100 | parm->db.ippathid = path->pathid; | |
1101 | parm->db.ipmsgid = msg->id; | |
1102 | parm->db.iptrgcls = msg->class; | |
1103 | parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); | |
1104 | rc = iucv_call_b2f0(IUCV_REJECT, parm); | |
1105 | local_bh_enable(); | |
1106 | return rc; | |
1107 | } | |
da99f056 | 1108 | EXPORT_SYMBOL(iucv_message_reject); |
2356f4cb MS |
1109 | |
1110 | /** | |
1111 | * iucv_message_reply | |
1112 | * @path: address of iucv path structure | |
1113 | * @msg: address of iucv msg structure | |
1114 | * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1115 | * @reply: address of reply data buffer or address of struct iucv_array | |
1116 | * @size: length of reply data buffer | |
1117 | * | |
1118 | * This function responds to the two-way messages that you receive. You | |
1119 | * must identify completely the message to which you wish to reply. ie, | |
1120 | * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into | |
1121 | * the parameter list. | |
1122 | * | |
1123 | * Returns the result from the CP IUCV call. | |
1124 | */ | |
1125 | int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, | |
1126 | u8 flags, void *reply, size_t size) | |
1127 | { | |
1128 | union iucv_param *parm; | |
1129 | int rc; | |
1130 | ||
1131 | local_bh_disable(); | |
70cf5035 | 1132 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1133 | memset(parm, 0, sizeof(union iucv_param)); |
1134 | if (flags & IUCV_IPRMDATA) { | |
1135 | parm->dpl.ippathid = path->pathid; | |
1136 | parm->dpl.ipflags1 = flags; | |
1137 | parm->dpl.ipmsgid = msg->id; | |
1138 | parm->dpl.iptrgcls = msg->class; | |
1139 | memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); | |
1140 | } else { | |
1141 | parm->db.ipbfadr1 = (u32)(addr_t) reply; | |
1142 | parm->db.ipbfln1f = (u32) size; | |
1143 | parm->db.ippathid = path->pathid; | |
1144 | parm->db.ipflags1 = flags; | |
1145 | parm->db.ipmsgid = msg->id; | |
1146 | parm->db.iptrgcls = msg->class; | |
1147 | } | |
1148 | rc = iucv_call_b2f0(IUCV_REPLY, parm); | |
1149 | local_bh_enable(); | |
1150 | return rc; | |
1151 | } | |
da99f056 | 1152 | EXPORT_SYMBOL(iucv_message_reply); |
2356f4cb MS |
1153 | |
1154 | /** | |
91d5d45e | 1155 | * __iucv_message_send |
2356f4cb MS |
1156 | * @path: address of iucv path structure |
1157 | * @msg: address of iucv msg structure | |
1158 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1159 | * @srccls: source class of message | |
1160 | * @buffer: address of send buffer or address of struct iucv_array | |
1161 | * @size: length of send buffer | |
1162 | * | |
1163 | * This function transmits data to another application. Data to be | |
1164 | * transmitted is in a buffer and this is a one-way message and the | |
1165 | * receiver will not reply to the message. | |
1166 | * | |
91d5d45e HB |
1167 | * Locking: no locking |
1168 | * | |
2356f4cb MS |
1169 | * Returns the result from the CP IUCV call. |
1170 | */ | |
91d5d45e | 1171 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
2356f4cb MS |
1172 | u8 flags, u32 srccls, void *buffer, size_t size) |
1173 | { | |
1174 | union iucv_param *parm; | |
1175 | int rc; | |
1176 | ||
70cf5035 | 1177 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1178 | memset(parm, 0, sizeof(union iucv_param)); |
1179 | if (flags & IUCV_IPRMDATA) { | |
1180 | /* Message of 8 bytes can be placed into the parameter list. */ | |
1181 | parm->dpl.ippathid = path->pathid; | |
1182 | parm->dpl.ipflags1 = flags | IUCV_IPNORPY; | |
1183 | parm->dpl.iptrgcls = msg->class; | |
1184 | parm->dpl.ipsrccls = srccls; | |
1185 | parm->dpl.ipmsgtag = msg->tag; | |
1186 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1187 | } else { | |
1188 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1189 | parm->db.ipbfln1f = (u32) size; | |
1190 | parm->db.ippathid = path->pathid; | |
1191 | parm->db.ipflags1 = flags | IUCV_IPNORPY; | |
1192 | parm->db.iptrgcls = msg->class; | |
1193 | parm->db.ipsrccls = srccls; | |
1194 | parm->db.ipmsgtag = msg->tag; | |
1195 | } | |
1196 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1197 | if (!rc) | |
1198 | msg->id = parm->db.ipmsgid; | |
91d5d45e HB |
1199 | return rc; |
1200 | } | |
1201 | EXPORT_SYMBOL(__iucv_message_send); | |
1202 | ||
1203 | /** | |
1204 | * iucv_message_send | |
1205 | * @path: address of iucv path structure | |
1206 | * @msg: address of iucv msg structure | |
1207 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1208 | * @srccls: source class of message | |
1209 | * @buffer: address of send buffer or address of struct iucv_array | |
1210 | * @size: length of send buffer | |
1211 | * | |
1212 | * This function transmits data to another application. Data to be | |
1213 | * transmitted is in a buffer and this is a one-way message and the | |
1214 | * receiver will not reply to the message. | |
1215 | * | |
1216 | * Locking: local_bh_enable/local_bh_disable | |
1217 | * | |
1218 | * Returns the result from the CP IUCV call. | |
1219 | */ | |
1220 | int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, | |
1221 | u8 flags, u32 srccls, void *buffer, size_t size) | |
1222 | { | |
1223 | int rc; | |
1224 | ||
1225 | local_bh_disable(); | |
1226 | rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); | |
2356f4cb MS |
1227 | local_bh_enable(); |
1228 | return rc; | |
1229 | } | |
da99f056 | 1230 | EXPORT_SYMBOL(iucv_message_send); |
2356f4cb MS |
1231 | |
1232 | /** | |
1233 | * iucv_message_send2way | |
1234 | * @path: address of iucv path structure | |
1235 | * @msg: address of iucv msg structure | |
1236 | * @flags: how the message is sent and the reply is received | |
1237 | * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) | |
1238 | * @srccls: source class of message | |
1239 | * @buffer: address of send buffer or address of struct iucv_array | |
1240 | * @size: length of send buffer | |
1241 | * @ansbuf: address of answer buffer or address of struct iucv_array | |
1242 | * @asize: size of reply buffer | |
1243 | * | |
1244 | * This function transmits data to another application. Data to be | |
1245 | * transmitted is in a buffer. The receiver of the send is expected to | |
1246 | * reply to the message and a buffer is provided into which IUCV moves | |
1247 | * the reply to this message. | |
1248 | * | |
1249 | * Returns the result from the CP IUCV call. | |
1250 | */ | |
1251 | int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, | |
1252 | u8 flags, u32 srccls, void *buffer, size_t size, | |
1253 | void *answer, size_t asize, size_t *residual) | |
1254 | { | |
1255 | union iucv_param *parm; | |
1256 | int rc; | |
1257 | ||
1258 | local_bh_disable(); | |
70cf5035 | 1259 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1260 | memset(parm, 0, sizeof(union iucv_param)); |
1261 | if (flags & IUCV_IPRMDATA) { | |
1262 | parm->dpl.ippathid = path->pathid; | |
1263 | parm->dpl.ipflags1 = path->flags; /* priority message */ | |
1264 | parm->dpl.iptrgcls = msg->class; | |
1265 | parm->dpl.ipsrccls = srccls; | |
1266 | parm->dpl.ipmsgtag = msg->tag; | |
1267 | parm->dpl.ipbfadr2 = (u32)(addr_t) answer; | |
1268 | parm->dpl.ipbfln2f = (u32) asize; | |
1269 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1270 | } else { | |
1271 | parm->db.ippathid = path->pathid; | |
1272 | parm->db.ipflags1 = path->flags; /* priority message */ | |
1273 | parm->db.iptrgcls = msg->class; | |
1274 | parm->db.ipsrccls = srccls; | |
1275 | parm->db.ipmsgtag = msg->tag; | |
1276 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1277 | parm->db.ipbfln1f = (u32) size; | |
1278 | parm->db.ipbfadr2 = (u32)(addr_t) answer; | |
1279 | parm->db.ipbfln2f = (u32) asize; | |
1280 | } | |
1281 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1282 | if (!rc) | |
1283 | msg->id = parm->db.ipmsgid; | |
1284 | local_bh_enable(); | |
1285 | return rc; | |
1286 | } | |
da99f056 | 1287 | EXPORT_SYMBOL(iucv_message_send2way); |
2356f4cb MS |
1288 | |
1289 | /** | |
1290 | * iucv_path_pending | |
1291 | * @data: Pointer to external interrupt buffer | |
1292 | * | |
1293 | * Process connection pending work item. Called from tasklet while holding | |
1294 | * iucv_table_lock. | |
1295 | */ | |
1296 | struct iucv_path_pending { | |
1297 | u16 ippathid; | |
1298 | u8 ipflags1; | |
1299 | u8 iptype; | |
1300 | u16 ipmsglim; | |
1301 | u16 res1; | |
1302 | u8 ipvmid[8]; | |
1303 | u8 ipuser[16]; | |
1304 | u32 res3; | |
1305 | u8 ippollfg; | |
1306 | u8 res4[3]; | |
1307 | } __attribute__ ((packed)); | |
1308 | ||
1309 | static void iucv_path_pending(struct iucv_irq_data *data) | |
1310 | { | |
1311 | struct iucv_path_pending *ipp = (void *) data; | |
1312 | struct iucv_handler *handler; | |
1313 | struct iucv_path *path; | |
1314 | char *error; | |
1315 | ||
1316 | BUG_ON(iucv_path_table[ipp->ippathid]); | |
1317 | /* New pathid, handler found. Create a new path struct. */ | |
1318 | error = iucv_error_no_memory; | |
1319 | path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); | |
1320 | if (!path) | |
1321 | goto out_sever; | |
1322 | path->pathid = ipp->ippathid; | |
1323 | iucv_path_table[path->pathid] = path; | |
1324 | EBCASC(ipp->ipvmid, 8); | |
1325 | ||
1326 | /* Call registered handler until one is found that wants the path. */ | |
1327 | list_for_each_entry(handler, &iucv_handler_list, list) { | |
1328 | if (!handler->path_pending) | |
1329 | continue; | |
1330 | /* | |
1331 | * Add path to handler to allow a call to iucv_path_sever | |
1332 | * inside the path_pending function. If the handler returns | |
1333 | * an error remove the path from the handler again. | |
1334 | */ | |
1335 | list_add(&path->list, &handler->paths); | |
1336 | path->handler = handler; | |
1337 | if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) | |
1338 | return; | |
1339 | list_del(&path->list); | |
1340 | path->handler = NULL; | |
1341 | } | |
1342 | /* No handler wanted the path. */ | |
1343 | iucv_path_table[path->pathid] = NULL; | |
1344 | iucv_path_free(path); | |
1345 | error = iucv_error_no_listener; | |
1346 | out_sever: | |
1347 | iucv_sever_pathid(ipp->ippathid, error); | |
1348 | } | |
1349 | ||
1350 | /** | |
1351 | * iucv_path_complete | |
1352 | * @data: Pointer to external interrupt buffer | |
1353 | * | |
1354 | * Process connection complete work item. Called from tasklet while holding | |
1355 | * iucv_table_lock. | |
1356 | */ | |
1357 | struct iucv_path_complete { | |
1358 | u16 ippathid; | |
1359 | u8 ipflags1; | |
1360 | u8 iptype; | |
1361 | u16 ipmsglim; | |
1362 | u16 res1; | |
1363 | u8 res2[8]; | |
1364 | u8 ipuser[16]; | |
1365 | u32 res3; | |
1366 | u8 ippollfg; | |
1367 | u8 res4[3]; | |
1368 | } __attribute__ ((packed)); | |
1369 | ||
1370 | static void iucv_path_complete(struct iucv_irq_data *data) | |
1371 | { | |
1372 | struct iucv_path_complete *ipc = (void *) data; | |
1373 | struct iucv_path *path = iucv_path_table[ipc->ippathid]; | |
1374 | ||
04b090d5 | 1375 | if (path && path->handler && path->handler->path_complete) |
2356f4cb MS |
1376 | path->handler->path_complete(path, ipc->ipuser); |
1377 | } | |
1378 | ||
1379 | /** | |
1380 | * iucv_path_severed | |
1381 | * @data: Pointer to external interrupt buffer | |
1382 | * | |
1383 | * Process connection severed work item. Called from tasklet while holding | |
1384 | * iucv_table_lock. | |
1385 | */ | |
1386 | struct iucv_path_severed { | |
1387 | u16 ippathid; | |
1388 | u8 res1; | |
1389 | u8 iptype; | |
1390 | u32 res2; | |
1391 | u8 res3[8]; | |
1392 | u8 ipuser[16]; | |
1393 | u32 res4; | |
1394 | u8 ippollfg; | |
1395 | u8 res5[3]; | |
1396 | } __attribute__ ((packed)); | |
1397 | ||
1398 | static void iucv_path_severed(struct iucv_irq_data *data) | |
1399 | { | |
1400 | struct iucv_path_severed *ips = (void *) data; | |
1401 | struct iucv_path *path = iucv_path_table[ips->ippathid]; | |
1402 | ||
04b090d5 MS |
1403 | if (!path || !path->handler) /* Already severed */ |
1404 | return; | |
2356f4cb MS |
1405 | if (path->handler->path_severed) |
1406 | path->handler->path_severed(path, ips->ipuser); | |
1407 | else { | |
1408 | iucv_sever_pathid(path->pathid, NULL); | |
1409 | iucv_path_table[path->pathid] = NULL; | |
1410 | list_del_init(&path->list); | |
2356f4cb MS |
1411 | iucv_path_free(path); |
1412 | } | |
1413 | } | |
1414 | ||
1415 | /** | |
1416 | * iucv_path_quiesced | |
1417 | * @data: Pointer to external interrupt buffer | |
1418 | * | |
1419 | * Process connection quiesced work item. Called from tasklet while holding | |
1420 | * iucv_table_lock. | |
1421 | */ | |
1422 | struct iucv_path_quiesced { | |
1423 | u16 ippathid; | |
1424 | u8 res1; | |
1425 | u8 iptype; | |
1426 | u32 res2; | |
1427 | u8 res3[8]; | |
1428 | u8 ipuser[16]; | |
1429 | u32 res4; | |
1430 | u8 ippollfg; | |
1431 | u8 res5[3]; | |
1432 | } __attribute__ ((packed)); | |
1433 | ||
1434 | static void iucv_path_quiesced(struct iucv_irq_data *data) | |
1435 | { | |
1436 | struct iucv_path_quiesced *ipq = (void *) data; | |
1437 | struct iucv_path *path = iucv_path_table[ipq->ippathid]; | |
1438 | ||
04b090d5 | 1439 | if (path && path->handler && path->handler->path_quiesced) |
2356f4cb MS |
1440 | path->handler->path_quiesced(path, ipq->ipuser); |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * iucv_path_resumed | |
1445 | * @data: Pointer to external interrupt buffer | |
1446 | * | |
1447 | * Process connection resumed work item. Called from tasklet while holding | |
1448 | * iucv_table_lock. | |
1449 | */ | |
1450 | struct iucv_path_resumed { | |
1451 | u16 ippathid; | |
1452 | u8 res1; | |
1453 | u8 iptype; | |
1454 | u32 res2; | |
1455 | u8 res3[8]; | |
1456 | u8 ipuser[16]; | |
1457 | u32 res4; | |
1458 | u8 ippollfg; | |
1459 | u8 res5[3]; | |
1460 | } __attribute__ ((packed)); | |
1461 | ||
1462 | static void iucv_path_resumed(struct iucv_irq_data *data) | |
1463 | { | |
1464 | struct iucv_path_resumed *ipr = (void *) data; | |
1465 | struct iucv_path *path = iucv_path_table[ipr->ippathid]; | |
1466 | ||
04b090d5 | 1467 | if (path && path->handler && path->handler->path_resumed) |
2356f4cb MS |
1468 | path->handler->path_resumed(path, ipr->ipuser); |
1469 | } | |
1470 | ||
1471 | /** | |
1472 | * iucv_message_complete | |
1473 | * @data: Pointer to external interrupt buffer | |
1474 | * | |
1475 | * Process message complete work item. Called from tasklet while holding | |
1476 | * iucv_table_lock. | |
1477 | */ | |
1478 | struct iucv_message_complete { | |
1479 | u16 ippathid; | |
1480 | u8 ipflags1; | |
1481 | u8 iptype; | |
1482 | u32 ipmsgid; | |
1483 | u32 ipaudit; | |
1484 | u8 iprmmsg[8]; | |
1485 | u32 ipsrccls; | |
1486 | u32 ipmsgtag; | |
1487 | u32 res; | |
1488 | u32 ipbfln2f; | |
1489 | u8 ippollfg; | |
1490 | u8 res2[3]; | |
1491 | } __attribute__ ((packed)); | |
1492 | ||
1493 | static void iucv_message_complete(struct iucv_irq_data *data) | |
1494 | { | |
1495 | struct iucv_message_complete *imc = (void *) data; | |
1496 | struct iucv_path *path = iucv_path_table[imc->ippathid]; | |
1497 | struct iucv_message msg; | |
1498 | ||
04b090d5 | 1499 | if (path && path->handler && path->handler->message_complete) { |
2356f4cb MS |
1500 | msg.flags = imc->ipflags1; |
1501 | msg.id = imc->ipmsgid; | |
1502 | msg.audit = imc->ipaudit; | |
1503 | memcpy(msg.rmmsg, imc->iprmmsg, 8); | |
1504 | msg.class = imc->ipsrccls; | |
1505 | msg.tag = imc->ipmsgtag; | |
1506 | msg.length = imc->ipbfln2f; | |
1507 | path->handler->message_complete(path, &msg); | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | /** | |
1512 | * iucv_message_pending | |
1513 | * @data: Pointer to external interrupt buffer | |
1514 | * | |
1515 | * Process message pending work item. Called from tasklet while holding | |
1516 | * iucv_table_lock. | |
1517 | */ | |
1518 | struct iucv_message_pending { | |
1519 | u16 ippathid; | |
1520 | u8 ipflags1; | |
1521 | u8 iptype; | |
1522 | u32 ipmsgid; | |
1523 | u32 iptrgcls; | |
1524 | union { | |
1525 | u32 iprmmsg1_u32; | |
1526 | u8 iprmmsg1[4]; | |
1527 | } ln1msg1; | |
1528 | union { | |
1529 | u32 ipbfln1f; | |
1530 | u8 iprmmsg2[4]; | |
1531 | } ln1msg2; | |
1532 | u32 res1[3]; | |
1533 | u32 ipbfln2f; | |
1534 | u8 ippollfg; | |
1535 | u8 res2[3]; | |
1536 | } __attribute__ ((packed)); | |
1537 | ||
1538 | static void iucv_message_pending(struct iucv_irq_data *data) | |
1539 | { | |
1540 | struct iucv_message_pending *imp = (void *) data; | |
1541 | struct iucv_path *path = iucv_path_table[imp->ippathid]; | |
1542 | struct iucv_message msg; | |
1543 | ||
04b090d5 | 1544 | if (path && path->handler && path->handler->message_pending) { |
2356f4cb MS |
1545 | msg.flags = imp->ipflags1; |
1546 | msg.id = imp->ipmsgid; | |
1547 | msg.class = imp->iptrgcls; | |
1548 | if (imp->ipflags1 & IUCV_IPRMDATA) { | |
1549 | memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8); | |
1550 | msg.length = 8; | |
1551 | } else | |
1552 | msg.length = imp->ln1msg2.ipbfln1f; | |
1553 | msg.reply_size = imp->ipbfln2f; | |
1554 | path->handler->message_pending(path, &msg); | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | /** | |
04b090d5 | 1559 | * iucv_tasklet_fn: |
2356f4cb MS |
1560 | * |
1561 | * This tasklet loops over the queue of irq buffers created by | |
1562 | * iucv_external_interrupt, calls the appropriate action handler | |
1563 | * and then frees the buffer. | |
1564 | */ | |
04b090d5 | 1565 | static void iucv_tasklet_fn(unsigned long ignored) |
2356f4cb MS |
1566 | { |
1567 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
1568 | static iucv_irq_fn *irq_fn[] = { | |
2356f4cb MS |
1569 | [0x02] = iucv_path_complete, |
1570 | [0x03] = iucv_path_severed, | |
1571 | [0x04] = iucv_path_quiesced, | |
1572 | [0x05] = iucv_path_resumed, | |
1573 | [0x06] = iucv_message_complete, | |
1574 | [0x07] = iucv_message_complete, | |
1575 | [0x08] = iucv_message_pending, | |
1576 | [0x09] = iucv_message_pending, | |
1577 | }; | |
b5e78337 | 1578 | LIST_HEAD(task_queue); |
04b090d5 | 1579 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
1580 | |
1581 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
13fdc9a7 UB |
1582 | if (!spin_trylock(&iucv_table_lock)) { |
1583 | tasklet_schedule(&iucv_tasklet); | |
1584 | return; | |
1585 | } | |
04b090d5 | 1586 | iucv_active_cpu = smp_processor_id(); |
2356f4cb | 1587 | |
04b090d5 MS |
1588 | spin_lock_irq(&iucv_queue_lock); |
1589 | list_splice_init(&iucv_task_queue, &task_queue); | |
1590 | spin_unlock_irq(&iucv_queue_lock); | |
1591 | ||
1592 | list_for_each_entry_safe(p, n, &task_queue, list) { | |
2356f4cb | 1593 | list_del_init(&p->list); |
2356f4cb MS |
1594 | irq_fn[p->data.iptype](&p->data); |
1595 | kfree(p); | |
2356f4cb | 1596 | } |
2356f4cb | 1597 | |
04b090d5 | 1598 | iucv_active_cpu = -1; |
2356f4cb MS |
1599 | spin_unlock(&iucv_table_lock); |
1600 | } | |
1601 | ||
04b090d5 MS |
1602 | /** |
1603 | * iucv_work_fn: | |
1604 | * | |
1605 | * This work function loops over the queue of path pending irq blocks | |
1606 | * created by iucv_external_interrupt, calls the appropriate action | |
1607 | * handler and then frees the buffer. | |
1608 | */ | |
1609 | static void iucv_work_fn(struct work_struct *work) | |
1610 | { | |
1611 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
b5e78337 | 1612 | LIST_HEAD(work_queue); |
04b090d5 MS |
1613 | struct iucv_irq_list *p, *n; |
1614 | ||
1615 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
1616 | spin_lock_bh(&iucv_table_lock); | |
1617 | iucv_active_cpu = smp_processor_id(); | |
1618 | ||
1619 | spin_lock_irq(&iucv_queue_lock); | |
1620 | list_splice_init(&iucv_work_queue, &work_queue); | |
1621 | spin_unlock_irq(&iucv_queue_lock); | |
1622 | ||
1623 | iucv_cleanup_queue(); | |
1624 | list_for_each_entry_safe(p, n, &work_queue, list) { | |
1625 | list_del_init(&p->list); | |
1626 | iucv_path_pending(&p->data); | |
1627 | kfree(p); | |
1628 | } | |
1629 | ||
1630 | iucv_active_cpu = -1; | |
1631 | spin_unlock_bh(&iucv_table_lock); | |
1632 | } | |
1633 | ||
2356f4cb MS |
1634 | /** |
1635 | * iucv_external_interrupt | |
1636 | * @code: irq code | |
1637 | * | |
1638 | * Handles external interrupts coming in from CP. | |
04b090d5 | 1639 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
2356f4cb MS |
1640 | */ |
1641 | static void iucv_external_interrupt(u16 code) | |
1642 | { | |
1643 | struct iucv_irq_data *p; | |
04b090d5 | 1644 | struct iucv_irq_list *work; |
2356f4cb | 1645 | |
70cf5035 | 1646 | p = iucv_irq_data[smp_processor_id()]; |
2356f4cb | 1647 | if (p->ippathid >= iucv_max_pathid) { |
c2b4afd2 | 1648 | WARN_ON(p->ippathid >= iucv_max_pathid); |
2356f4cb MS |
1649 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
1650 | return; | |
1651 | } | |
c2b4afd2 | 1652 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
04b090d5 | 1653 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
2356f4cb MS |
1654 | if (!work) { |
1655 | printk(KERN_WARNING "iucv_external_interrupt: out of memory\n"); | |
1656 | return; | |
1657 | } | |
1658 | memcpy(&work->data, p, sizeof(work->data)); | |
04b090d5 MS |
1659 | spin_lock(&iucv_queue_lock); |
1660 | if (p->iptype == 0x01) { | |
1661 | /* Path pending interrupt. */ | |
1662 | list_add_tail(&work->list, &iucv_work_queue); | |
1663 | schedule_work(&iucv_work); | |
1664 | } else { | |
1665 | /* The other interrupts. */ | |
1666 | list_add_tail(&work->list, &iucv_task_queue); | |
1667 | tasklet_schedule(&iucv_tasklet); | |
1668 | } | |
1669 | spin_unlock(&iucv_queue_lock); | |
2356f4cb MS |
1670 | } |
1671 | ||
1672 | /** | |
1673 | * iucv_init | |
1674 | * | |
1675 | * Allocates and initializes various data structures. | |
1676 | */ | |
da99f056 | 1677 | static int __init iucv_init(void) |
2356f4cb MS |
1678 | { |
1679 | int rc; | |
70cf5035 | 1680 | int cpu; |
2356f4cb MS |
1681 | |
1682 | if (!MACHINE_IS_VM) { | |
1683 | rc = -EPROTONOSUPPORT; | |
1684 | goto out; | |
1685 | } | |
1686 | rc = iucv_query_maxconn(); | |
1687 | if (rc) | |
1688 | goto out; | |
da99f056 | 1689 | rc = register_external_interrupt(0x4000, iucv_external_interrupt); |
2356f4cb MS |
1690 | if (rc) |
1691 | goto out; | |
2356f4cb MS |
1692 | iucv_root = s390_root_dev_register("iucv"); |
1693 | if (IS_ERR(iucv_root)) { | |
1694 | rc = PTR_ERR(iucv_root); | |
2d7bf367 | 1695 | goto out_int; |
2356f4cb | 1696 | } |
70cf5035 CL |
1697 | |
1698 | for_each_online_cpu(cpu) { | |
1699 | /* Note: GFP_DMA used to get memory below 2G */ | |
1700 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), | |
1701 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1702 | if (!iucv_irq_data[cpu]) { | |
1703 | rc = -ENOMEM; | |
1704 | goto out_free; | |
1705 | } | |
1706 | ||
1707 | /* Allocate parameter blocks. */ | |
1708 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), | |
1709 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1710 | if (!iucv_param[cpu]) { | |
1711 | rc = -ENOMEM; | |
1712 | goto out_free; | |
1713 | } | |
2356f4cb | 1714 | } |
2d7bf367 CH |
1715 | rc = register_hotcpu_notifier(&iucv_cpu_notifier); |
1716 | if (rc) | |
1717 | goto out_free; | |
2356f4cb MS |
1718 | ASCEBC(iucv_error_no_listener, 16); |
1719 | ASCEBC(iucv_error_no_memory, 16); | |
1720 | ASCEBC(iucv_error_pathid, 16); | |
1721 | iucv_available = 1; | |
2d7bf367 CH |
1722 | rc = bus_register(&iucv_bus); |
1723 | if (rc) | |
1724 | goto out_cpu; | |
2356f4cb MS |
1725 | return 0; |
1726 | ||
2d7bf367 CH |
1727 | out_cpu: |
1728 | unregister_hotcpu_notifier(&iucv_cpu_notifier); | |
70cf5035 CL |
1729 | out_free: |
1730 | for_each_possible_cpu(cpu) { | |
1731 | kfree(iucv_param[cpu]); | |
1732 | iucv_param[cpu] = NULL; | |
1733 | kfree(iucv_irq_data[cpu]); | |
1734 | iucv_irq_data[cpu] = NULL; | |
1735 | } | |
2356f4cb | 1736 | s390_root_dev_unregister(iucv_root); |
2356f4cb MS |
1737 | out_int: |
1738 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
1739 | out: | |
1740 | return rc; | |
1741 | } | |
1742 | ||
1743 | /** | |
1744 | * iucv_exit | |
1745 | * | |
1746 | * Frees everything allocated from iucv_init. | |
1747 | */ | |
da99f056 | 1748 | static void __exit iucv_exit(void) |
2356f4cb | 1749 | { |
04b090d5 | 1750 | struct iucv_irq_list *p, *n; |
70cf5035 | 1751 | int cpu; |
2356f4cb | 1752 | |
04b090d5 MS |
1753 | spin_lock_irq(&iucv_queue_lock); |
1754 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) | |
1755 | kfree(p); | |
2356f4cb MS |
1756 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
1757 | kfree(p); | |
04b090d5 | 1758 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb | 1759 | unregister_hotcpu_notifier(&iucv_cpu_notifier); |
70cf5035 CL |
1760 | for_each_possible_cpu(cpu) { |
1761 | kfree(iucv_param[cpu]); | |
1762 | iucv_param[cpu] = NULL; | |
1763 | kfree(iucv_irq_data[cpu]); | |
1764 | iucv_irq_data[cpu] = NULL; | |
1765 | } | |
2356f4cb MS |
1766 | s390_root_dev_unregister(iucv_root); |
1767 | bus_unregister(&iucv_bus); | |
1768 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
1769 | } | |
1770 | ||
1771 | subsys_initcall(iucv_init); | |
1772 | module_exit(iucv_exit); | |
1773 | ||
2356f4cb MS |
1774 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
1775 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); | |
1776 | MODULE_LICENSE("GPL"); |