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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> | |
53 | #include <asm/s390_rdev.h> | |
54 | #include <asm/smp.h> | |
55 | ||
56 | /* | |
57 | * FLAGS: | |
58 | * All flags are defined in the field IPFLAGS1 of each function | |
59 | * and can be found in CP Programming Services. | |
60 | * IPSRCCLS - Indicates you have specified a source class. | |
61 | * IPTRGCLS - Indicates you have specified a target class. | |
62 | * IPFGPID - Indicates you have specified a pathid. | |
63 | * IPFGMID - Indicates you have specified a message ID. | |
64 | * IPNORPY - Indicates a one-way message. No reply expected. | |
65 | * IPALL - Indicates that all paths are affected. | |
66 | */ | |
67 | #define IUCV_IPSRCCLS 0x01 | |
68 | #define IUCV_IPTRGCLS 0x01 | |
69 | #define IUCV_IPFGPID 0x02 | |
70 | #define IUCV_IPFGMID 0x04 | |
71 | #define IUCV_IPNORPY 0x10 | |
72 | #define IUCV_IPALL 0x80 | |
73 | ||
da99f056 | 74 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
2356f4cb MS |
75 | { |
76 | return 0; | |
77 | } | |
78 | ||
79 | struct bus_type iucv_bus = { | |
80 | .name = "iucv", | |
81 | .match = iucv_bus_match, | |
82 | }; | |
da99f056 | 83 | EXPORT_SYMBOL(iucv_bus); |
2356f4cb MS |
84 | |
85 | struct device *iucv_root; | |
da99f056 HC |
86 | EXPORT_SYMBOL(iucv_root); |
87 | ||
2356f4cb MS |
88 | static int iucv_available; |
89 | ||
90 | /* General IUCV interrupt structure */ | |
91 | struct iucv_irq_data { | |
92 | u16 ippathid; | |
93 | u8 ipflags1; | |
94 | u8 iptype; | |
95 | u32 res2[8]; | |
96 | }; | |
97 | ||
04b090d5 | 98 | struct iucv_irq_list { |
2356f4cb MS |
99 | struct list_head list; |
100 | struct iucv_irq_data data; | |
101 | }; | |
102 | ||
70cf5035 | 103 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
2356f4cb MS |
104 | static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE; |
105 | static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE; | |
106 | ||
04b090d5 MS |
107 | /* |
108 | * Queue of interrupt buffers lock for delivery via the tasklet | |
109 | * (fast but can't call smp_call_function). | |
110 | */ | |
111 | static LIST_HEAD(iucv_task_queue); | |
112 | ||
113 | /* | |
114 | * The tasklet for fast delivery of iucv interrupts. | |
115 | */ | |
116 | static void iucv_tasklet_fn(unsigned long); | |
117 | static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0); | |
118 | ||
119 | /* | |
120 | * Queue of interrupt buffers for delivery via a work queue | |
121 | * (slower but can call smp_call_function). | |
122 | */ | |
123 | static LIST_HEAD(iucv_work_queue); | |
124 | ||
125 | /* | |
126 | * The work element to deliver path pending interrupts. | |
127 | */ | |
128 | static void iucv_work_fn(struct work_struct *work); | |
129 | static DECLARE_WORK(iucv_work, iucv_work_fn); | |
130 | ||
131 | /* | |
132 | * Spinlock protecting task and work queue. | |
133 | */ | |
134 | static DEFINE_SPINLOCK(iucv_queue_lock); | |
2356f4cb MS |
135 | |
136 | enum iucv_command_codes { | |
137 | IUCV_QUERY = 0, | |
138 | IUCV_RETRIEVE_BUFFER = 2, | |
139 | IUCV_SEND = 4, | |
140 | IUCV_RECEIVE = 5, | |
141 | IUCV_REPLY = 6, | |
142 | IUCV_REJECT = 8, | |
143 | IUCV_PURGE = 9, | |
144 | IUCV_ACCEPT = 10, | |
145 | IUCV_CONNECT = 11, | |
146 | IUCV_DECLARE_BUFFER = 12, | |
147 | IUCV_QUIESCE = 13, | |
148 | IUCV_RESUME = 14, | |
149 | IUCV_SEVER = 15, | |
150 | IUCV_SETMASK = 16, | |
151 | }; | |
152 | ||
153 | /* | |
154 | * Error messages that are used with the iucv_sever function. They get | |
155 | * converted to EBCDIC. | |
156 | */ | |
157 | static char iucv_error_no_listener[16] = "NO LISTENER"; | |
158 | static char iucv_error_no_memory[16] = "NO MEMORY"; | |
159 | static char iucv_error_pathid[16] = "INVALID PATHID"; | |
160 | ||
161 | /* | |
162 | * iucv_handler_list: List of registered handlers. | |
163 | */ | |
164 | static LIST_HEAD(iucv_handler_list); | |
165 | ||
166 | /* | |
167 | * iucv_path_table: an array of iucv_path structures. | |
168 | */ | |
169 | static struct iucv_path **iucv_path_table; | |
170 | static unsigned long iucv_max_pathid; | |
171 | ||
172 | /* | |
173 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table | |
174 | */ | |
175 | static DEFINE_SPINLOCK(iucv_table_lock); | |
176 | ||
177 | /* | |
04b090d5 MS |
178 | * iucv_active_cpu: contains the number of the cpu executing the tasklet |
179 | * or the work handler. Needed for iucv_path_sever called from tasklet. | |
2356f4cb | 180 | */ |
04b090d5 | 181 | static int iucv_active_cpu = -1; |
2356f4cb MS |
182 | |
183 | /* | |
184 | * Mutex and wait queue for iucv_register/iucv_unregister. | |
185 | */ | |
186 | static DEFINE_MUTEX(iucv_register_mutex); | |
187 | ||
188 | /* | |
189 | * Counter for number of non-smp capable handlers. | |
190 | */ | |
191 | static int iucv_nonsmp_handler; | |
192 | ||
193 | /* | |
194 | * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, | |
195 | * iucv_path_quiesce and iucv_path_sever. | |
196 | */ | |
197 | struct iucv_cmd_control { | |
198 | u16 ippathid; | |
199 | u8 ipflags1; | |
200 | u8 iprcode; | |
201 | u16 ipmsglim; | |
202 | u16 res1; | |
203 | u8 ipvmid[8]; | |
204 | u8 ipuser[16]; | |
205 | u8 iptarget[8]; | |
206 | } __attribute__ ((packed,aligned(8))); | |
207 | ||
208 | /* | |
209 | * Data in parameter list iucv structure. Used by iucv_message_send, | |
210 | * iucv_message_send2way and iucv_message_reply. | |
211 | */ | |
212 | struct iucv_cmd_dpl { | |
213 | u16 ippathid; | |
214 | u8 ipflags1; | |
215 | u8 iprcode; | |
216 | u32 ipmsgid; | |
217 | u32 iptrgcls; | |
218 | u8 iprmmsg[8]; | |
219 | u32 ipsrccls; | |
220 | u32 ipmsgtag; | |
221 | u32 ipbfadr2; | |
222 | u32 ipbfln2f; | |
223 | u32 res; | |
224 | } __attribute__ ((packed,aligned(8))); | |
225 | ||
226 | /* | |
227 | * Data in buffer iucv structure. Used by iucv_message_receive, | |
228 | * iucv_message_reject, iucv_message_send, iucv_message_send2way | |
229 | * and iucv_declare_cpu. | |
230 | */ | |
231 | struct iucv_cmd_db { | |
232 | u16 ippathid; | |
233 | u8 ipflags1; | |
234 | u8 iprcode; | |
235 | u32 ipmsgid; | |
236 | u32 iptrgcls; | |
237 | u32 ipbfadr1; | |
238 | u32 ipbfln1f; | |
239 | u32 ipsrccls; | |
240 | u32 ipmsgtag; | |
241 | u32 ipbfadr2; | |
242 | u32 ipbfln2f; | |
243 | u32 res; | |
244 | } __attribute__ ((packed,aligned(8))); | |
245 | ||
246 | /* | |
247 | * Purge message iucv structure. Used by iucv_message_purge. | |
248 | */ | |
249 | struct iucv_cmd_purge { | |
250 | u16 ippathid; | |
251 | u8 ipflags1; | |
252 | u8 iprcode; | |
253 | u32 ipmsgid; | |
254 | u8 ipaudit[3]; | |
255 | u8 res1[5]; | |
256 | u32 res2; | |
257 | u32 ipsrccls; | |
258 | u32 ipmsgtag; | |
259 | u32 res3[3]; | |
260 | } __attribute__ ((packed,aligned(8))); | |
261 | ||
262 | /* | |
263 | * Set mask iucv structure. Used by iucv_enable_cpu. | |
264 | */ | |
265 | struct iucv_cmd_set_mask { | |
266 | u8 ipmask; | |
267 | u8 res1[2]; | |
268 | u8 iprcode; | |
269 | u32 res2[9]; | |
270 | } __attribute__ ((packed,aligned(8))); | |
271 | ||
272 | union iucv_param { | |
273 | struct iucv_cmd_control ctrl; | |
274 | struct iucv_cmd_dpl dpl; | |
275 | struct iucv_cmd_db db; | |
276 | struct iucv_cmd_purge purge; | |
277 | struct iucv_cmd_set_mask set_mask; | |
278 | }; | |
279 | ||
280 | /* | |
281 | * Anchor for per-cpu IUCV command parameter block. | |
282 | */ | |
70cf5035 | 283 | static union iucv_param *iucv_param[NR_CPUS]; |
2356f4cb MS |
284 | |
285 | /** | |
286 | * iucv_call_b2f0 | |
287 | * @code: identifier of IUCV call to CP. | |
288 | * @parm: pointer to a struct iucv_parm block | |
289 | * | |
290 | * Calls CP to execute IUCV commands. | |
291 | * | |
292 | * Returns the result of the CP IUCV call. | |
293 | */ | |
294 | static inline int iucv_call_b2f0(int command, union iucv_param *parm) | |
295 | { | |
296 | register unsigned long reg0 asm ("0"); | |
297 | register unsigned long reg1 asm ("1"); | |
298 | int ccode; | |
299 | ||
300 | reg0 = command; | |
301 | reg1 = virt_to_phys(parm); | |
302 | asm volatile( | |
303 | " .long 0xb2f01000\n" | |
304 | " ipm %0\n" | |
305 | " srl %0,28\n" | |
306 | : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1) | |
307 | : "m" (*parm) : "cc"); | |
308 | return (ccode == 1) ? parm->ctrl.iprcode : ccode; | |
309 | } | |
310 | ||
311 | /** | |
312 | * iucv_query_maxconn | |
313 | * | |
314 | * Determines the maximum number of connections that may be established. | |
315 | * | |
316 | * Returns the maximum number of connections or -EPERM is IUCV is not | |
317 | * available. | |
318 | */ | |
319 | static int iucv_query_maxconn(void) | |
320 | { | |
321 | register unsigned long reg0 asm ("0"); | |
322 | register unsigned long reg1 asm ("1"); | |
323 | void *param; | |
324 | int ccode; | |
325 | ||
326 | param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA); | |
327 | if (!param) | |
328 | return -ENOMEM; | |
329 | reg0 = IUCV_QUERY; | |
330 | reg1 = (unsigned long) param; | |
331 | asm volatile ( | |
332 | " .long 0xb2f01000\n" | |
333 | " ipm %0\n" | |
334 | " srl %0,28\n" | |
335 | : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc"); | |
336 | if (ccode == 0) | |
337 | iucv_max_pathid = reg0; | |
338 | kfree(param); | |
339 | return ccode ? -EPERM : 0; | |
340 | } | |
341 | ||
342 | /** | |
343 | * iucv_allow_cpu | |
344 | * @data: unused | |
345 | * | |
346 | * Allow iucv interrupts on this cpu. | |
347 | */ | |
348 | static void iucv_allow_cpu(void *data) | |
349 | { | |
350 | int cpu = smp_processor_id(); | |
351 | union iucv_param *parm; | |
352 | ||
353 | /* | |
354 | * Enable all iucv interrupts. | |
355 | * ipmask contains bits for the different interrupts | |
356 | * 0x80 - Flag to allow nonpriority message pending interrupts | |
357 | * 0x40 - Flag to allow priority message pending interrupts | |
358 | * 0x20 - Flag to allow nonpriority message completion interrupts | |
359 | * 0x10 - Flag to allow priority message completion interrupts | |
360 | * 0x08 - Flag to allow IUCV control interrupts | |
361 | */ | |
70cf5035 | 362 | parm = iucv_param[cpu]; |
2356f4cb MS |
363 | memset(parm, 0, sizeof(union iucv_param)); |
364 | parm->set_mask.ipmask = 0xf8; | |
365 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
366 | ||
367 | /* Set indication that iucv interrupts are allowed for this cpu. */ | |
368 | cpu_set(cpu, iucv_irq_cpumask); | |
369 | } | |
370 | ||
371 | /** | |
372 | * iucv_block_cpu | |
373 | * @data: unused | |
374 | * | |
375 | * Block iucv interrupts on this cpu. | |
376 | */ | |
377 | static void iucv_block_cpu(void *data) | |
378 | { | |
379 | int cpu = smp_processor_id(); | |
380 | union iucv_param *parm; | |
381 | ||
382 | /* Disable all iucv interrupts. */ | |
70cf5035 | 383 | parm = iucv_param[cpu]; |
2356f4cb MS |
384 | memset(parm, 0, sizeof(union iucv_param)); |
385 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
386 | ||
387 | /* Clear indication that iucv interrupts are allowed for this cpu. */ | |
388 | cpu_clear(cpu, iucv_irq_cpumask); | |
389 | } | |
390 | ||
391 | /** | |
392 | * iucv_declare_cpu | |
393 | * @data: unused | |
394 | * | |
3a4fa0a2 | 395 | * Declare a interrupt buffer on this cpu. |
2356f4cb MS |
396 | */ |
397 | static void iucv_declare_cpu(void *data) | |
398 | { | |
399 | int cpu = smp_processor_id(); | |
400 | union iucv_param *parm; | |
401 | int rc; | |
402 | ||
403 | if (cpu_isset(cpu, iucv_buffer_cpumask)) | |
404 | return; | |
405 | ||
406 | /* Declare interrupt buffer. */ | |
70cf5035 | 407 | parm = iucv_param[cpu]; |
2356f4cb | 408 | memset(parm, 0, sizeof(union iucv_param)); |
70cf5035 | 409 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
2356f4cb MS |
410 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
411 | if (rc) { | |
412 | char *err = "Unknown"; | |
da99f056 | 413 | switch (rc) { |
2356f4cb MS |
414 | case 0x03: |
415 | err = "Directory error"; | |
416 | break; | |
417 | case 0x0a: | |
418 | err = "Invalid length"; | |
419 | break; | |
420 | case 0x13: | |
421 | err = "Buffer already exists"; | |
422 | break; | |
423 | case 0x3e: | |
424 | err = "Buffer overlap"; | |
425 | break; | |
426 | case 0x5c: | |
427 | err = "Paging or storage error"; | |
428 | break; | |
429 | } | |
8f7c502c UB |
430 | pr_warning("Defining an interrupt buffer on CPU %i" |
431 | " failed with 0x%02x (%s)\n", cpu, rc, err); | |
2356f4cb MS |
432 | return; |
433 | } | |
434 | ||
435 | /* Set indication that an iucv buffer exists for this cpu. */ | |
436 | cpu_set(cpu, iucv_buffer_cpumask); | |
437 | ||
438 | if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask)) | |
439 | /* Enable iucv interrupts on this cpu. */ | |
440 | iucv_allow_cpu(NULL); | |
441 | else | |
442 | /* Disable iucv interrupts on this cpu. */ | |
443 | iucv_block_cpu(NULL); | |
444 | } | |
445 | ||
446 | /** | |
447 | * iucv_retrieve_cpu | |
448 | * @data: unused | |
449 | * | |
450 | * Retrieve interrupt buffer on this cpu. | |
451 | */ | |
452 | static void iucv_retrieve_cpu(void *data) | |
453 | { | |
454 | int cpu = smp_processor_id(); | |
455 | union iucv_param *parm; | |
456 | ||
457 | if (!cpu_isset(cpu, iucv_buffer_cpumask)) | |
458 | return; | |
459 | ||
460 | /* Block iucv interrupts. */ | |
461 | iucv_block_cpu(NULL); | |
462 | ||
463 | /* Retrieve interrupt buffer. */ | |
70cf5035 | 464 | parm = iucv_param[cpu]; |
2356f4cb MS |
465 | iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); |
466 | ||
467 | /* Clear indication that an iucv buffer exists for this cpu. */ | |
468 | cpu_clear(cpu, iucv_buffer_cpumask); | |
469 | } | |
470 | ||
471 | /** | |
472 | * iucv_setmask_smp | |
473 | * | |
474 | * Allow iucv interrupts on all cpus. | |
475 | */ | |
476 | static void iucv_setmask_mp(void) | |
477 | { | |
478 | int cpu; | |
479 | ||
7b9d1b22 | 480 | get_online_cpus(); |
2356f4cb MS |
481 | for_each_online_cpu(cpu) |
482 | /* Enable all cpus with a declared buffer. */ | |
483 | if (cpu_isset(cpu, iucv_buffer_cpumask) && | |
484 | !cpu_isset(cpu, iucv_irq_cpumask)) | |
3bb447fc | 485 | smp_call_function_single(cpu, iucv_allow_cpu, |
8691e5a8 | 486 | NULL, 1); |
7b9d1b22 | 487 | put_online_cpus(); |
2356f4cb MS |
488 | } |
489 | ||
490 | /** | |
491 | * iucv_setmask_up | |
492 | * | |
04b090d5 | 493 | * Allow iucv interrupts on a single cpu. |
2356f4cb MS |
494 | */ |
495 | static void iucv_setmask_up(void) | |
496 | { | |
497 | cpumask_t cpumask; | |
498 | int cpu; | |
499 | ||
500 | /* Disable all cpu but the first in cpu_irq_cpumask. */ | |
501 | cpumask = iucv_irq_cpumask; | |
502 | cpu_clear(first_cpu(iucv_irq_cpumask), cpumask); | |
0e12f848 | 503 | for_each_cpu_mask_nr(cpu, cpumask) |
8691e5a8 | 504 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
2356f4cb MS |
505 | } |
506 | ||
507 | /** | |
508 | * iucv_enable | |
509 | * | |
510 | * This function makes iucv ready for use. It allocates the pathid | |
511 | * table, declares an iucv interrupt buffer and enables the iucv | |
512 | * interrupts. Called when the first user has registered an iucv | |
513 | * handler. | |
514 | */ | |
515 | static int iucv_enable(void) | |
516 | { | |
517 | size_t alloc_size; | |
518 | int cpu, rc; | |
519 | ||
520 | rc = -ENOMEM; | |
521 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); | |
522 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); | |
523 | if (!iucv_path_table) | |
524 | goto out; | |
525 | /* Declare per cpu buffers. */ | |
526 | rc = -EIO; | |
7b9d1b22 | 527 | get_online_cpus(); |
2356f4cb | 528 | for_each_online_cpu(cpu) |
8691e5a8 | 529 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
530 | if (cpus_empty(iucv_buffer_cpumask)) |
531 | /* No cpu could declare an iucv buffer. */ | |
532 | goto out_path; | |
7b9d1b22 | 533 | put_online_cpus(); |
2356f4cb MS |
534 | return 0; |
535 | ||
536 | out_path: | |
7b9d1b22 | 537 | put_online_cpus(); |
2356f4cb MS |
538 | kfree(iucv_path_table); |
539 | out: | |
540 | return rc; | |
541 | } | |
542 | ||
543 | /** | |
544 | * iucv_disable | |
545 | * | |
546 | * This function shuts down iucv. It disables iucv interrupts, retrieves | |
547 | * the iucv interrupt buffer and frees the pathid table. Called after the | |
548 | * last user unregister its iucv handler. | |
549 | */ | |
550 | static void iucv_disable(void) | |
551 | { | |
8b122efd | 552 | get_online_cpus(); |
15c8b6c1 | 553 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
8b122efd | 554 | put_online_cpus(); |
2356f4cb MS |
555 | kfree(iucv_path_table); |
556 | } | |
557 | ||
2356f4cb MS |
558 | static int __cpuinit iucv_cpu_notify(struct notifier_block *self, |
559 | unsigned long action, void *hcpu) | |
560 | { | |
561 | cpumask_t cpumask; | |
562 | long cpu = (long) hcpu; | |
563 | ||
564 | switch (action) { | |
565 | case CPU_UP_PREPARE: | |
8bb78442 | 566 | case CPU_UP_PREPARE_FROZEN: |
70cf5035 CL |
567 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), |
568 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
569 | if (!iucv_irq_data[cpu]) | |
2356f4cb | 570 | return NOTIFY_BAD; |
70cf5035 CL |
571 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
572 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
d0236f8f AM |
573 | if (!iucv_param[cpu]) { |
574 | kfree(iucv_irq_data[cpu]); | |
575 | iucv_irq_data[cpu] = NULL; | |
2356f4cb | 576 | return NOTIFY_BAD; |
d0236f8f | 577 | } |
2356f4cb MS |
578 | break; |
579 | case CPU_UP_CANCELED: | |
8bb78442 | 580 | case CPU_UP_CANCELED_FROZEN: |
2356f4cb | 581 | case CPU_DEAD: |
8bb78442 | 582 | case CPU_DEAD_FROZEN: |
70cf5035 CL |
583 | kfree(iucv_param[cpu]); |
584 | iucv_param[cpu] = NULL; | |
585 | kfree(iucv_irq_data[cpu]); | |
586 | iucv_irq_data[cpu] = NULL; | |
2356f4cb MS |
587 | break; |
588 | case CPU_ONLINE: | |
8bb78442 | 589 | case CPU_ONLINE_FROZEN: |
2356f4cb | 590 | case CPU_DOWN_FAILED: |
8bb78442 | 591 | case CPU_DOWN_FAILED_FROZEN: |
8691e5a8 | 592 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
593 | break; |
594 | case CPU_DOWN_PREPARE: | |
8bb78442 | 595 | case CPU_DOWN_PREPARE_FROZEN: |
2356f4cb MS |
596 | cpumask = iucv_buffer_cpumask; |
597 | cpu_clear(cpu, cpumask); | |
598 | if (cpus_empty(cpumask)) | |
599 | /* Can't offline last IUCV enabled cpu. */ | |
600 | return NOTIFY_BAD; | |
8691e5a8 | 601 | smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 602 | if (cpus_empty(iucv_irq_cpumask)) |
3bb447fc | 603 | smp_call_function_single(first_cpu(iucv_buffer_cpumask), |
8691e5a8 | 604 | iucv_allow_cpu, NULL, 1); |
2356f4cb MS |
605 | break; |
606 | } | |
607 | return NOTIFY_OK; | |
608 | } | |
609 | ||
f1494ed1 | 610 | static struct notifier_block __refdata iucv_cpu_notifier = { |
2356f4cb MS |
611 | .notifier_call = iucv_cpu_notify, |
612 | }; | |
2356f4cb MS |
613 | |
614 | /** | |
615 | * iucv_sever_pathid | |
616 | * @pathid: path identification number. | |
617 | * @userdata: 16-bytes of user data. | |
618 | * | |
619 | * Sever an iucv path to free up the pathid. Used internally. | |
620 | */ | |
621 | static int iucv_sever_pathid(u16 pathid, u8 userdata[16]) | |
622 | { | |
623 | union iucv_param *parm; | |
624 | ||
70cf5035 | 625 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
626 | memset(parm, 0, sizeof(union iucv_param)); |
627 | if (userdata) | |
628 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
629 | parm->ctrl.ippathid = pathid; | |
630 | return iucv_call_b2f0(IUCV_SEVER, parm); | |
631 | } | |
632 | ||
633 | /** | |
04b090d5 | 634 | * __iucv_cleanup_queue |
2356f4cb MS |
635 | * @dummy: unused dummy argument |
636 | * | |
637 | * Nop function called via smp_call_function to force work items from | |
638 | * pending external iucv interrupts to the work queue. | |
639 | */ | |
04b090d5 | 640 | static void __iucv_cleanup_queue(void *dummy) |
2356f4cb MS |
641 | { |
642 | } | |
643 | ||
644 | /** | |
04b090d5 | 645 | * iucv_cleanup_queue |
2356f4cb MS |
646 | * |
647 | * Function called after a path has been severed to find all remaining | |
648 | * work items for the now stale pathid. The caller needs to hold the | |
649 | * iucv_table_lock. | |
650 | */ | |
04b090d5 | 651 | static void iucv_cleanup_queue(void) |
2356f4cb | 652 | { |
04b090d5 | 653 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
654 | |
655 | /* | |
04b090d5 MS |
656 | * When a path is severed, the pathid can be reused immediatly |
657 | * on a iucv connect or a connection pending interrupt. Remove | |
658 | * all entries from the task queue that refer to a stale pathid | |
659 | * (iucv_path_table[ix] == NULL). Only then do the iucv connect | |
660 | * or deliver the connection pending interrupt. To get all the | |
661 | * pending interrupts force them to the work queue by calling | |
662 | * an empty function on all cpus. | |
2356f4cb | 663 | */ |
8691e5a8 | 664 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
04b090d5 MS |
665 | spin_lock_irq(&iucv_queue_lock); |
666 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) { | |
667 | /* Remove stale work items from the task queue. */ | |
668 | if (iucv_path_table[p->data.ippathid] == NULL) { | |
2356f4cb MS |
669 | list_del(&p->list); |
670 | kfree(p); | |
671 | } | |
672 | } | |
04b090d5 | 673 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb MS |
674 | } |
675 | ||
676 | /** | |
677 | * iucv_register: | |
678 | * @handler: address of iucv handler structure | |
679 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
680 | * | |
681 | * Registers a driver with IUCV. | |
682 | * | |
683 | * Returns 0 on success, -ENOMEM if the memory allocation for the pathid | |
684 | * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. | |
685 | */ | |
686 | int iucv_register(struct iucv_handler *handler, int smp) | |
687 | { | |
688 | int rc; | |
689 | ||
690 | if (!iucv_available) | |
691 | return -ENOSYS; | |
692 | mutex_lock(&iucv_register_mutex); | |
693 | if (!smp) | |
694 | iucv_nonsmp_handler++; | |
695 | if (list_empty(&iucv_handler_list)) { | |
696 | rc = iucv_enable(); | |
697 | if (rc) | |
698 | goto out_mutex; | |
699 | } else if (!smp && iucv_nonsmp_handler == 1) | |
700 | iucv_setmask_up(); | |
701 | INIT_LIST_HEAD(&handler->paths); | |
702 | ||
435bc9df | 703 | spin_lock_bh(&iucv_table_lock); |
2356f4cb | 704 | list_add_tail(&handler->list, &iucv_handler_list); |
435bc9df | 705 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
706 | rc = 0; |
707 | out_mutex: | |
708 | mutex_unlock(&iucv_register_mutex); | |
709 | return rc; | |
710 | } | |
da99f056 | 711 | EXPORT_SYMBOL(iucv_register); |
2356f4cb MS |
712 | |
713 | /** | |
714 | * iucv_unregister | |
715 | * @handler: address of iucv handler structure | |
716 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
717 | * | |
718 | * Unregister driver from IUCV. | |
719 | */ | |
720 | void iucv_unregister(struct iucv_handler *handler, int smp) | |
721 | { | |
722 | struct iucv_path *p, *n; | |
723 | ||
724 | mutex_lock(&iucv_register_mutex); | |
725 | spin_lock_bh(&iucv_table_lock); | |
726 | /* Remove handler from the iucv_handler_list. */ | |
727 | list_del_init(&handler->list); | |
728 | /* Sever all pathids still refering to the handler. */ | |
729 | list_for_each_entry_safe(p, n, &handler->paths, list) { | |
730 | iucv_sever_pathid(p->pathid, NULL); | |
731 | iucv_path_table[p->pathid] = NULL; | |
732 | list_del(&p->list); | |
2356f4cb MS |
733 | iucv_path_free(p); |
734 | } | |
735 | spin_unlock_bh(&iucv_table_lock); | |
736 | if (!smp) | |
737 | iucv_nonsmp_handler--; | |
738 | if (list_empty(&iucv_handler_list)) | |
739 | iucv_disable(); | |
740 | else if (!smp && iucv_nonsmp_handler == 0) | |
741 | iucv_setmask_mp(); | |
742 | mutex_unlock(&iucv_register_mutex); | |
743 | } | |
da99f056 | 744 | EXPORT_SYMBOL(iucv_unregister); |
2356f4cb MS |
745 | |
746 | /** | |
747 | * iucv_path_accept | |
748 | * @path: address of iucv path structure | |
749 | * @handler: address of iucv handler structure | |
750 | * @userdata: 16 bytes of data reflected to the communication partner | |
751 | * @private: private data passed to interrupt handlers for this path | |
752 | * | |
753 | * This function is issued after the user received a connection pending | |
754 | * external interrupt and now wishes to complete the IUCV communication path. | |
755 | * | |
756 | * Returns the result of the CP IUCV call. | |
757 | */ | |
758 | int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, | |
759 | u8 userdata[16], void *private) | |
760 | { | |
761 | union iucv_param *parm; | |
762 | int rc; | |
763 | ||
764 | local_bh_disable(); | |
765 | /* Prepare parameter block. */ | |
70cf5035 | 766 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
767 | memset(parm, 0, sizeof(union iucv_param)); |
768 | parm->ctrl.ippathid = path->pathid; | |
769 | parm->ctrl.ipmsglim = path->msglim; | |
770 | if (userdata) | |
771 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
772 | parm->ctrl.ipflags1 = path->flags; | |
773 | ||
774 | rc = iucv_call_b2f0(IUCV_ACCEPT, parm); | |
775 | if (!rc) { | |
776 | path->private = private; | |
777 | path->msglim = parm->ctrl.ipmsglim; | |
778 | path->flags = parm->ctrl.ipflags1; | |
779 | } | |
780 | local_bh_enable(); | |
781 | return rc; | |
782 | } | |
da99f056 | 783 | EXPORT_SYMBOL(iucv_path_accept); |
2356f4cb MS |
784 | |
785 | /** | |
786 | * iucv_path_connect | |
787 | * @path: address of iucv path structure | |
788 | * @handler: address of iucv handler structure | |
789 | * @userid: 8-byte user identification | |
790 | * @system: 8-byte target system identification | |
791 | * @userdata: 16 bytes of data reflected to the communication partner | |
792 | * @private: private data passed to interrupt handlers for this path | |
793 | * | |
794 | * This function establishes an IUCV path. Although the connect may complete | |
795 | * successfully, you are not able to use the path until you receive an IUCV | |
796 | * Connection Complete external interrupt. | |
797 | * | |
798 | * Returns the result of the CP IUCV call. | |
799 | */ | |
800 | int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, | |
801 | u8 userid[8], u8 system[8], u8 userdata[16], | |
802 | void *private) | |
803 | { | |
804 | union iucv_param *parm; | |
805 | int rc; | |
806 | ||
04b090d5 MS |
807 | spin_lock_bh(&iucv_table_lock); |
808 | iucv_cleanup_queue(); | |
70cf5035 | 809 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
810 | memset(parm, 0, sizeof(union iucv_param)); |
811 | parm->ctrl.ipmsglim = path->msglim; | |
812 | parm->ctrl.ipflags1 = path->flags; | |
813 | if (userid) { | |
814 | memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); | |
815 | ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
816 | EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
817 | } | |
818 | if (system) { | |
819 | memcpy(parm->ctrl.iptarget, system, | |
820 | sizeof(parm->ctrl.iptarget)); | |
821 | ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
822 | EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
823 | } | |
824 | if (userdata) | |
825 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
826 | ||
827 | rc = iucv_call_b2f0(IUCV_CONNECT, parm); | |
828 | if (!rc) { | |
829 | if (parm->ctrl.ippathid < iucv_max_pathid) { | |
830 | path->pathid = parm->ctrl.ippathid; | |
831 | path->msglim = parm->ctrl.ipmsglim; | |
832 | path->flags = parm->ctrl.ipflags1; | |
833 | path->handler = handler; | |
834 | path->private = private; | |
835 | list_add_tail(&path->list, &handler->paths); | |
836 | iucv_path_table[path->pathid] = path; | |
837 | } else { | |
838 | iucv_sever_pathid(parm->ctrl.ippathid, | |
839 | iucv_error_pathid); | |
840 | rc = -EIO; | |
841 | } | |
842 | } | |
04b090d5 | 843 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
844 | return rc; |
845 | } | |
da99f056 | 846 | EXPORT_SYMBOL(iucv_path_connect); |
2356f4cb MS |
847 | |
848 | /** | |
849 | * iucv_path_quiesce: | |
850 | * @path: address of iucv path structure | |
851 | * @userdata: 16 bytes of data reflected to the communication partner | |
852 | * | |
853 | * This function temporarily suspends incoming messages on an IUCV path. | |
854 | * You can later reactivate the path by invoking the iucv_resume function. | |
855 | * | |
856 | * Returns the result from the CP IUCV call. | |
857 | */ | |
858 | int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]) | |
859 | { | |
860 | union iucv_param *parm; | |
861 | int rc; | |
862 | ||
863 | local_bh_disable(); | |
70cf5035 | 864 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
865 | memset(parm, 0, sizeof(union iucv_param)); |
866 | if (userdata) | |
867 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
868 | parm->ctrl.ippathid = path->pathid; | |
869 | rc = iucv_call_b2f0(IUCV_QUIESCE, parm); | |
870 | local_bh_enable(); | |
871 | return rc; | |
872 | } | |
da99f056 | 873 | EXPORT_SYMBOL(iucv_path_quiesce); |
2356f4cb MS |
874 | |
875 | /** | |
876 | * iucv_path_resume: | |
877 | * @path: address of iucv path structure | |
878 | * @userdata: 16 bytes of data reflected to the communication partner | |
879 | * | |
880 | * This function resumes incoming messages on an IUCV path that has | |
881 | * been stopped with iucv_path_quiesce. | |
882 | * | |
883 | * Returns the result from the CP IUCV call. | |
884 | */ | |
885 | int iucv_path_resume(struct iucv_path *path, u8 userdata[16]) | |
886 | { | |
887 | union iucv_param *parm; | |
888 | int rc; | |
889 | ||
890 | local_bh_disable(); | |
70cf5035 | 891 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
892 | memset(parm, 0, sizeof(union iucv_param)); |
893 | if (userdata) | |
894 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
895 | parm->ctrl.ippathid = path->pathid; | |
896 | rc = iucv_call_b2f0(IUCV_RESUME, parm); | |
897 | local_bh_enable(); | |
898 | return rc; | |
899 | } | |
900 | ||
901 | /** | |
902 | * iucv_path_sever | |
903 | * @path: address of iucv path structure | |
904 | * @userdata: 16 bytes of data reflected to the communication partner | |
905 | * | |
906 | * This function terminates an IUCV path. | |
907 | * | |
908 | * Returns the result from the CP IUCV call. | |
909 | */ | |
910 | int iucv_path_sever(struct iucv_path *path, u8 userdata[16]) | |
911 | { | |
912 | int rc; | |
913 | ||
2356f4cb | 914 | preempt_disable(); |
04b090d5 | 915 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
916 | spin_lock_bh(&iucv_table_lock); |
917 | rc = iucv_sever_pathid(path->pathid, userdata); | |
918 | if (!rc) { | |
919 | iucv_path_table[path->pathid] = NULL; | |
920 | list_del_init(&path->list); | |
2356f4cb | 921 | } |
04b090d5 | 922 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
923 | spin_unlock_bh(&iucv_table_lock); |
924 | preempt_enable(); | |
925 | return rc; | |
926 | } | |
da99f056 | 927 | EXPORT_SYMBOL(iucv_path_sever); |
2356f4cb MS |
928 | |
929 | /** | |
930 | * iucv_message_purge | |
931 | * @path: address of iucv path structure | |
932 | * @msg: address of iucv msg structure | |
933 | * @srccls: source class of message | |
934 | * | |
935 | * Cancels a message you have sent. | |
936 | * | |
937 | * Returns the result from the CP IUCV call. | |
938 | */ | |
939 | int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, | |
940 | u32 srccls) | |
941 | { | |
942 | union iucv_param *parm; | |
943 | int rc; | |
944 | ||
945 | local_bh_disable(); | |
70cf5035 | 946 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
947 | memset(parm, 0, sizeof(union iucv_param)); |
948 | parm->purge.ippathid = path->pathid; | |
949 | parm->purge.ipmsgid = msg->id; | |
950 | parm->purge.ipsrccls = srccls; | |
951 | parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; | |
952 | rc = iucv_call_b2f0(IUCV_PURGE, parm); | |
953 | if (!rc) { | |
954 | msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; | |
955 | msg->tag = parm->purge.ipmsgtag; | |
956 | } | |
957 | local_bh_enable(); | |
958 | return rc; | |
959 | } | |
da99f056 | 960 | EXPORT_SYMBOL(iucv_message_purge); |
2356f4cb MS |
961 | |
962 | /** | |
91d5d45e HB |
963 | * iucv_message_receive_iprmdata |
964 | * @path: address of iucv path structure | |
965 | * @msg: address of iucv msg structure | |
966 | * @flags: how the message is received (IUCV_IPBUFLST) | |
967 | * @buffer: address of data buffer or address of struct iucv_array | |
968 | * @size: length of data buffer | |
969 | * @residual: | |
970 | * | |
971 | * Internal function used by iucv_message_receive and __iucv_message_receive | |
972 | * to receive RMDATA data stored in struct iucv_message. | |
973 | */ | |
974 | static int iucv_message_receive_iprmdata(struct iucv_path *path, | |
975 | struct iucv_message *msg, | |
976 | u8 flags, void *buffer, | |
977 | size_t size, size_t *residual) | |
978 | { | |
979 | struct iucv_array *array; | |
980 | u8 *rmmsg; | |
981 | size_t copy; | |
982 | ||
983 | /* | |
984 | * Message is 8 bytes long and has been stored to the | |
985 | * message descriptor itself. | |
986 | */ | |
987 | if (residual) | |
988 | *residual = abs(size - 8); | |
989 | rmmsg = msg->rmmsg; | |
990 | if (flags & IUCV_IPBUFLST) { | |
991 | /* Copy to struct iucv_array. */ | |
992 | size = (size < 8) ? size : 8; | |
993 | for (array = buffer; size > 0; array++) { | |
994 | copy = min_t(size_t, size, array->length); | |
995 | memcpy((u8 *)(addr_t) array->address, | |
996 | rmmsg, copy); | |
997 | rmmsg += copy; | |
998 | size -= copy; | |
999 | } | |
1000 | } else { | |
1001 | /* Copy to direct buffer. */ | |
1002 | memcpy(buffer, rmmsg, min_t(size_t, size, 8)); | |
1003 | } | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * __iucv_message_receive | |
2356f4cb MS |
1009 | * @path: address of iucv path structure |
1010 | * @msg: address of iucv msg structure | |
1011 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1012 | * @buffer: address of data buffer or address of struct iucv_array | |
1013 | * @size: length of data buffer | |
1014 | * @residual: | |
1015 | * | |
1016 | * This function receives messages that are being sent to you over | |
1017 | * established paths. This function will deal with RMDATA messages | |
1018 | * embedded in struct iucv_message as well. | |
1019 | * | |
91d5d45e HB |
1020 | * Locking: no locking |
1021 | * | |
2356f4cb MS |
1022 | * Returns the result from the CP IUCV call. |
1023 | */ | |
91d5d45e HB |
1024 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1025 | u8 flags, void *buffer, size_t size, size_t *residual) | |
2356f4cb MS |
1026 | { |
1027 | union iucv_param *parm; | |
2356f4cb MS |
1028 | int rc; |
1029 | ||
91d5d45e HB |
1030 | if (msg->flags & IUCV_IPRMDATA) |
1031 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1032 | buffer, size, residual); | |
70cf5035 | 1033 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1034 | memset(parm, 0, sizeof(union iucv_param)); |
1035 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1036 | parm->db.ipbfln1f = (u32) size; | |
1037 | parm->db.ipmsgid = msg->id; | |
1038 | parm->db.ippathid = path->pathid; | |
1039 | parm->db.iptrgcls = msg->class; | |
1040 | parm->db.ipflags1 = (flags | IUCV_IPFGPID | | |
1041 | IUCV_IPFGMID | IUCV_IPTRGCLS); | |
1042 | rc = iucv_call_b2f0(IUCV_RECEIVE, parm); | |
1043 | if (!rc || rc == 5) { | |
1044 | msg->flags = parm->db.ipflags1; | |
1045 | if (residual) | |
1046 | *residual = parm->db.ipbfln1f; | |
1047 | } | |
91d5d45e HB |
1048 | return rc; |
1049 | } | |
1050 | EXPORT_SYMBOL(__iucv_message_receive); | |
1051 | ||
1052 | /** | |
1053 | * iucv_message_receive | |
1054 | * @path: address of iucv path structure | |
1055 | * @msg: address of iucv msg structure | |
1056 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1057 | * @buffer: address of data buffer or address of struct iucv_array | |
1058 | * @size: length of data buffer | |
1059 | * @residual: | |
1060 | * | |
1061 | * This function receives messages that are being sent to you over | |
1062 | * established paths. This function will deal with RMDATA messages | |
1063 | * embedded in struct iucv_message as well. | |
1064 | * | |
1065 | * Locking: local_bh_enable/local_bh_disable | |
1066 | * | |
1067 | * Returns the result from the CP IUCV call. | |
1068 | */ | |
1069 | int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, | |
1070 | u8 flags, void *buffer, size_t size, size_t *residual) | |
1071 | { | |
1072 | int rc; | |
1073 | ||
1074 | if (msg->flags & IUCV_IPRMDATA) | |
1075 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1076 | buffer, size, residual); | |
1077 | local_bh_disable(); | |
1078 | rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); | |
2356f4cb MS |
1079 | local_bh_enable(); |
1080 | return rc; | |
1081 | } | |
da99f056 | 1082 | EXPORT_SYMBOL(iucv_message_receive); |
2356f4cb MS |
1083 | |
1084 | /** | |
1085 | * iucv_message_reject | |
1086 | * @path: address of iucv path structure | |
1087 | * @msg: address of iucv msg structure | |
1088 | * | |
1089 | * The reject function refuses a specified message. Between the time you | |
1090 | * are notified of a message and the time that you complete the message, | |
1091 | * the message may be rejected. | |
1092 | * | |
1093 | * Returns the result from the CP IUCV call. | |
1094 | */ | |
1095 | int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) | |
1096 | { | |
1097 | union iucv_param *parm; | |
1098 | int rc; | |
1099 | ||
1100 | local_bh_disable(); | |
70cf5035 | 1101 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1102 | memset(parm, 0, sizeof(union iucv_param)); |
1103 | parm->db.ippathid = path->pathid; | |
1104 | parm->db.ipmsgid = msg->id; | |
1105 | parm->db.iptrgcls = msg->class; | |
1106 | parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); | |
1107 | rc = iucv_call_b2f0(IUCV_REJECT, parm); | |
1108 | local_bh_enable(); | |
1109 | return rc; | |
1110 | } | |
da99f056 | 1111 | EXPORT_SYMBOL(iucv_message_reject); |
2356f4cb MS |
1112 | |
1113 | /** | |
1114 | * iucv_message_reply | |
1115 | * @path: address of iucv path structure | |
1116 | * @msg: address of iucv msg structure | |
1117 | * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1118 | * @reply: address of reply data buffer or address of struct iucv_array | |
1119 | * @size: length of reply data buffer | |
1120 | * | |
1121 | * This function responds to the two-way messages that you receive. You | |
1122 | * must identify completely the message to which you wish to reply. ie, | |
1123 | * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into | |
1124 | * the parameter list. | |
1125 | * | |
1126 | * Returns the result from the CP IUCV call. | |
1127 | */ | |
1128 | int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, | |
1129 | u8 flags, void *reply, size_t size) | |
1130 | { | |
1131 | union iucv_param *parm; | |
1132 | int rc; | |
1133 | ||
1134 | local_bh_disable(); | |
70cf5035 | 1135 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1136 | memset(parm, 0, sizeof(union iucv_param)); |
1137 | if (flags & IUCV_IPRMDATA) { | |
1138 | parm->dpl.ippathid = path->pathid; | |
1139 | parm->dpl.ipflags1 = flags; | |
1140 | parm->dpl.ipmsgid = msg->id; | |
1141 | parm->dpl.iptrgcls = msg->class; | |
1142 | memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); | |
1143 | } else { | |
1144 | parm->db.ipbfadr1 = (u32)(addr_t) reply; | |
1145 | parm->db.ipbfln1f = (u32) size; | |
1146 | parm->db.ippathid = path->pathid; | |
1147 | parm->db.ipflags1 = flags; | |
1148 | parm->db.ipmsgid = msg->id; | |
1149 | parm->db.iptrgcls = msg->class; | |
1150 | } | |
1151 | rc = iucv_call_b2f0(IUCV_REPLY, parm); | |
1152 | local_bh_enable(); | |
1153 | return rc; | |
1154 | } | |
da99f056 | 1155 | EXPORT_SYMBOL(iucv_message_reply); |
2356f4cb MS |
1156 | |
1157 | /** | |
91d5d45e | 1158 | * __iucv_message_send |
2356f4cb MS |
1159 | * @path: address of iucv path structure |
1160 | * @msg: address of iucv msg structure | |
1161 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1162 | * @srccls: source class of message | |
1163 | * @buffer: address of send buffer or address of struct iucv_array | |
1164 | * @size: length of send buffer | |
1165 | * | |
1166 | * This function transmits data to another application. Data to be | |
1167 | * transmitted is in a buffer and this is a one-way message and the | |
1168 | * receiver will not reply to the message. | |
1169 | * | |
91d5d45e HB |
1170 | * Locking: no locking |
1171 | * | |
2356f4cb MS |
1172 | * Returns the result from the CP IUCV call. |
1173 | */ | |
91d5d45e | 1174 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
2356f4cb MS |
1175 | u8 flags, u32 srccls, void *buffer, size_t size) |
1176 | { | |
1177 | union iucv_param *parm; | |
1178 | int rc; | |
1179 | ||
70cf5035 | 1180 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1181 | memset(parm, 0, sizeof(union iucv_param)); |
1182 | if (flags & IUCV_IPRMDATA) { | |
1183 | /* Message of 8 bytes can be placed into the parameter list. */ | |
1184 | parm->dpl.ippathid = path->pathid; | |
1185 | parm->dpl.ipflags1 = flags | IUCV_IPNORPY; | |
1186 | parm->dpl.iptrgcls = msg->class; | |
1187 | parm->dpl.ipsrccls = srccls; | |
1188 | parm->dpl.ipmsgtag = msg->tag; | |
1189 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1190 | } else { | |
1191 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1192 | parm->db.ipbfln1f = (u32) size; | |
1193 | parm->db.ippathid = path->pathid; | |
1194 | parm->db.ipflags1 = flags | IUCV_IPNORPY; | |
1195 | parm->db.iptrgcls = msg->class; | |
1196 | parm->db.ipsrccls = srccls; | |
1197 | parm->db.ipmsgtag = msg->tag; | |
1198 | } | |
1199 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1200 | if (!rc) | |
1201 | msg->id = parm->db.ipmsgid; | |
91d5d45e HB |
1202 | return rc; |
1203 | } | |
1204 | EXPORT_SYMBOL(__iucv_message_send); | |
1205 | ||
1206 | /** | |
1207 | * iucv_message_send | |
1208 | * @path: address of iucv path structure | |
1209 | * @msg: address of iucv msg structure | |
1210 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1211 | * @srccls: source class of message | |
1212 | * @buffer: address of send buffer or address of struct iucv_array | |
1213 | * @size: length of send buffer | |
1214 | * | |
1215 | * This function transmits data to another application. Data to be | |
1216 | * transmitted is in a buffer and this is a one-way message and the | |
1217 | * receiver will not reply to the message. | |
1218 | * | |
1219 | * Locking: local_bh_enable/local_bh_disable | |
1220 | * | |
1221 | * Returns the result from the CP IUCV call. | |
1222 | */ | |
1223 | int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, | |
1224 | u8 flags, u32 srccls, void *buffer, size_t size) | |
1225 | { | |
1226 | int rc; | |
1227 | ||
1228 | local_bh_disable(); | |
1229 | rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); | |
2356f4cb MS |
1230 | local_bh_enable(); |
1231 | return rc; | |
1232 | } | |
da99f056 | 1233 | EXPORT_SYMBOL(iucv_message_send); |
2356f4cb MS |
1234 | |
1235 | /** | |
1236 | * iucv_message_send2way | |
1237 | * @path: address of iucv path structure | |
1238 | * @msg: address of iucv msg structure | |
1239 | * @flags: how the message is sent and the reply is received | |
1240 | * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) | |
1241 | * @srccls: source class of message | |
1242 | * @buffer: address of send buffer or address of struct iucv_array | |
1243 | * @size: length of send buffer | |
1244 | * @ansbuf: address of answer buffer or address of struct iucv_array | |
1245 | * @asize: size of reply buffer | |
1246 | * | |
1247 | * This function transmits data to another application. Data to be | |
1248 | * transmitted is in a buffer. The receiver of the send is expected to | |
1249 | * reply to the message and a buffer is provided into which IUCV moves | |
1250 | * the reply to this message. | |
1251 | * | |
1252 | * Returns the result from the CP IUCV call. | |
1253 | */ | |
1254 | int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, | |
1255 | u8 flags, u32 srccls, void *buffer, size_t size, | |
1256 | void *answer, size_t asize, size_t *residual) | |
1257 | { | |
1258 | union iucv_param *parm; | |
1259 | int rc; | |
1260 | ||
1261 | local_bh_disable(); | |
70cf5035 | 1262 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1263 | memset(parm, 0, sizeof(union iucv_param)); |
1264 | if (flags & IUCV_IPRMDATA) { | |
1265 | parm->dpl.ippathid = path->pathid; | |
1266 | parm->dpl.ipflags1 = path->flags; /* priority message */ | |
1267 | parm->dpl.iptrgcls = msg->class; | |
1268 | parm->dpl.ipsrccls = srccls; | |
1269 | parm->dpl.ipmsgtag = msg->tag; | |
1270 | parm->dpl.ipbfadr2 = (u32)(addr_t) answer; | |
1271 | parm->dpl.ipbfln2f = (u32) asize; | |
1272 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1273 | } else { | |
1274 | parm->db.ippathid = path->pathid; | |
1275 | parm->db.ipflags1 = path->flags; /* priority message */ | |
1276 | parm->db.iptrgcls = msg->class; | |
1277 | parm->db.ipsrccls = srccls; | |
1278 | parm->db.ipmsgtag = msg->tag; | |
1279 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1280 | parm->db.ipbfln1f = (u32) size; | |
1281 | parm->db.ipbfadr2 = (u32)(addr_t) answer; | |
1282 | parm->db.ipbfln2f = (u32) asize; | |
1283 | } | |
1284 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1285 | if (!rc) | |
1286 | msg->id = parm->db.ipmsgid; | |
1287 | local_bh_enable(); | |
1288 | return rc; | |
1289 | } | |
da99f056 | 1290 | EXPORT_SYMBOL(iucv_message_send2way); |
2356f4cb MS |
1291 | |
1292 | /** | |
1293 | * iucv_path_pending | |
1294 | * @data: Pointer to external interrupt buffer | |
1295 | * | |
1296 | * Process connection pending work item. Called from tasklet while holding | |
1297 | * iucv_table_lock. | |
1298 | */ | |
1299 | struct iucv_path_pending { | |
1300 | u16 ippathid; | |
1301 | u8 ipflags1; | |
1302 | u8 iptype; | |
1303 | u16 ipmsglim; | |
1304 | u16 res1; | |
1305 | u8 ipvmid[8]; | |
1306 | u8 ipuser[16]; | |
1307 | u32 res3; | |
1308 | u8 ippollfg; | |
1309 | u8 res4[3]; | |
1310 | } __attribute__ ((packed)); | |
1311 | ||
1312 | static void iucv_path_pending(struct iucv_irq_data *data) | |
1313 | { | |
1314 | struct iucv_path_pending *ipp = (void *) data; | |
1315 | struct iucv_handler *handler; | |
1316 | struct iucv_path *path; | |
1317 | char *error; | |
1318 | ||
1319 | BUG_ON(iucv_path_table[ipp->ippathid]); | |
1320 | /* New pathid, handler found. Create a new path struct. */ | |
1321 | error = iucv_error_no_memory; | |
1322 | path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); | |
1323 | if (!path) | |
1324 | goto out_sever; | |
1325 | path->pathid = ipp->ippathid; | |
1326 | iucv_path_table[path->pathid] = path; | |
1327 | EBCASC(ipp->ipvmid, 8); | |
1328 | ||
1329 | /* Call registered handler until one is found that wants the path. */ | |
1330 | list_for_each_entry(handler, &iucv_handler_list, list) { | |
1331 | if (!handler->path_pending) | |
1332 | continue; | |
1333 | /* | |
1334 | * Add path to handler to allow a call to iucv_path_sever | |
1335 | * inside the path_pending function. If the handler returns | |
1336 | * an error remove the path from the handler again. | |
1337 | */ | |
1338 | list_add(&path->list, &handler->paths); | |
1339 | path->handler = handler; | |
1340 | if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) | |
1341 | return; | |
1342 | list_del(&path->list); | |
1343 | path->handler = NULL; | |
1344 | } | |
1345 | /* No handler wanted the path. */ | |
1346 | iucv_path_table[path->pathid] = NULL; | |
1347 | iucv_path_free(path); | |
1348 | error = iucv_error_no_listener; | |
1349 | out_sever: | |
1350 | iucv_sever_pathid(ipp->ippathid, error); | |
1351 | } | |
1352 | ||
1353 | /** | |
1354 | * iucv_path_complete | |
1355 | * @data: Pointer to external interrupt buffer | |
1356 | * | |
1357 | * Process connection complete work item. Called from tasklet while holding | |
1358 | * iucv_table_lock. | |
1359 | */ | |
1360 | struct iucv_path_complete { | |
1361 | u16 ippathid; | |
1362 | u8 ipflags1; | |
1363 | u8 iptype; | |
1364 | u16 ipmsglim; | |
1365 | u16 res1; | |
1366 | u8 res2[8]; | |
1367 | u8 ipuser[16]; | |
1368 | u32 res3; | |
1369 | u8 ippollfg; | |
1370 | u8 res4[3]; | |
1371 | } __attribute__ ((packed)); | |
1372 | ||
1373 | static void iucv_path_complete(struct iucv_irq_data *data) | |
1374 | { | |
1375 | struct iucv_path_complete *ipc = (void *) data; | |
1376 | struct iucv_path *path = iucv_path_table[ipc->ippathid]; | |
1377 | ||
04b090d5 | 1378 | if (path && path->handler && path->handler->path_complete) |
2356f4cb MS |
1379 | path->handler->path_complete(path, ipc->ipuser); |
1380 | } | |
1381 | ||
1382 | /** | |
1383 | * iucv_path_severed | |
1384 | * @data: Pointer to external interrupt buffer | |
1385 | * | |
1386 | * Process connection severed work item. Called from tasklet while holding | |
1387 | * iucv_table_lock. | |
1388 | */ | |
1389 | struct iucv_path_severed { | |
1390 | u16 ippathid; | |
1391 | u8 res1; | |
1392 | u8 iptype; | |
1393 | u32 res2; | |
1394 | u8 res3[8]; | |
1395 | u8 ipuser[16]; | |
1396 | u32 res4; | |
1397 | u8 ippollfg; | |
1398 | u8 res5[3]; | |
1399 | } __attribute__ ((packed)); | |
1400 | ||
1401 | static void iucv_path_severed(struct iucv_irq_data *data) | |
1402 | { | |
1403 | struct iucv_path_severed *ips = (void *) data; | |
1404 | struct iucv_path *path = iucv_path_table[ips->ippathid]; | |
1405 | ||
04b090d5 MS |
1406 | if (!path || !path->handler) /* Already severed */ |
1407 | return; | |
2356f4cb MS |
1408 | if (path->handler->path_severed) |
1409 | path->handler->path_severed(path, ips->ipuser); | |
1410 | else { | |
1411 | iucv_sever_pathid(path->pathid, NULL); | |
1412 | iucv_path_table[path->pathid] = NULL; | |
1413 | list_del_init(&path->list); | |
2356f4cb MS |
1414 | iucv_path_free(path); |
1415 | } | |
1416 | } | |
1417 | ||
1418 | /** | |
1419 | * iucv_path_quiesced | |
1420 | * @data: Pointer to external interrupt buffer | |
1421 | * | |
1422 | * Process connection quiesced work item. Called from tasklet while holding | |
1423 | * iucv_table_lock. | |
1424 | */ | |
1425 | struct iucv_path_quiesced { | |
1426 | u16 ippathid; | |
1427 | u8 res1; | |
1428 | u8 iptype; | |
1429 | u32 res2; | |
1430 | u8 res3[8]; | |
1431 | u8 ipuser[16]; | |
1432 | u32 res4; | |
1433 | u8 ippollfg; | |
1434 | u8 res5[3]; | |
1435 | } __attribute__ ((packed)); | |
1436 | ||
1437 | static void iucv_path_quiesced(struct iucv_irq_data *data) | |
1438 | { | |
1439 | struct iucv_path_quiesced *ipq = (void *) data; | |
1440 | struct iucv_path *path = iucv_path_table[ipq->ippathid]; | |
1441 | ||
04b090d5 | 1442 | if (path && path->handler && path->handler->path_quiesced) |
2356f4cb MS |
1443 | path->handler->path_quiesced(path, ipq->ipuser); |
1444 | } | |
1445 | ||
1446 | /** | |
1447 | * iucv_path_resumed | |
1448 | * @data: Pointer to external interrupt buffer | |
1449 | * | |
1450 | * Process connection resumed work item. Called from tasklet while holding | |
1451 | * iucv_table_lock. | |
1452 | */ | |
1453 | struct iucv_path_resumed { | |
1454 | u16 ippathid; | |
1455 | u8 res1; | |
1456 | u8 iptype; | |
1457 | u32 res2; | |
1458 | u8 res3[8]; | |
1459 | u8 ipuser[16]; | |
1460 | u32 res4; | |
1461 | u8 ippollfg; | |
1462 | u8 res5[3]; | |
1463 | } __attribute__ ((packed)); | |
1464 | ||
1465 | static void iucv_path_resumed(struct iucv_irq_data *data) | |
1466 | { | |
1467 | struct iucv_path_resumed *ipr = (void *) data; | |
1468 | struct iucv_path *path = iucv_path_table[ipr->ippathid]; | |
1469 | ||
04b090d5 | 1470 | if (path && path->handler && path->handler->path_resumed) |
2356f4cb MS |
1471 | path->handler->path_resumed(path, ipr->ipuser); |
1472 | } | |
1473 | ||
1474 | /** | |
1475 | * iucv_message_complete | |
1476 | * @data: Pointer to external interrupt buffer | |
1477 | * | |
1478 | * Process message complete work item. Called from tasklet while holding | |
1479 | * iucv_table_lock. | |
1480 | */ | |
1481 | struct iucv_message_complete { | |
1482 | u16 ippathid; | |
1483 | u8 ipflags1; | |
1484 | u8 iptype; | |
1485 | u32 ipmsgid; | |
1486 | u32 ipaudit; | |
1487 | u8 iprmmsg[8]; | |
1488 | u32 ipsrccls; | |
1489 | u32 ipmsgtag; | |
1490 | u32 res; | |
1491 | u32 ipbfln2f; | |
1492 | u8 ippollfg; | |
1493 | u8 res2[3]; | |
1494 | } __attribute__ ((packed)); | |
1495 | ||
1496 | static void iucv_message_complete(struct iucv_irq_data *data) | |
1497 | { | |
1498 | struct iucv_message_complete *imc = (void *) data; | |
1499 | struct iucv_path *path = iucv_path_table[imc->ippathid]; | |
1500 | struct iucv_message msg; | |
1501 | ||
04b090d5 | 1502 | if (path && path->handler && path->handler->message_complete) { |
2356f4cb MS |
1503 | msg.flags = imc->ipflags1; |
1504 | msg.id = imc->ipmsgid; | |
1505 | msg.audit = imc->ipaudit; | |
1506 | memcpy(msg.rmmsg, imc->iprmmsg, 8); | |
1507 | msg.class = imc->ipsrccls; | |
1508 | msg.tag = imc->ipmsgtag; | |
1509 | msg.length = imc->ipbfln2f; | |
1510 | path->handler->message_complete(path, &msg); | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | /** | |
1515 | * iucv_message_pending | |
1516 | * @data: Pointer to external interrupt buffer | |
1517 | * | |
1518 | * Process message pending work item. Called from tasklet while holding | |
1519 | * iucv_table_lock. | |
1520 | */ | |
1521 | struct iucv_message_pending { | |
1522 | u16 ippathid; | |
1523 | u8 ipflags1; | |
1524 | u8 iptype; | |
1525 | u32 ipmsgid; | |
1526 | u32 iptrgcls; | |
1527 | union { | |
1528 | u32 iprmmsg1_u32; | |
1529 | u8 iprmmsg1[4]; | |
1530 | } ln1msg1; | |
1531 | union { | |
1532 | u32 ipbfln1f; | |
1533 | u8 iprmmsg2[4]; | |
1534 | } ln1msg2; | |
1535 | u32 res1[3]; | |
1536 | u32 ipbfln2f; | |
1537 | u8 ippollfg; | |
1538 | u8 res2[3]; | |
1539 | } __attribute__ ((packed)); | |
1540 | ||
1541 | static void iucv_message_pending(struct iucv_irq_data *data) | |
1542 | { | |
1543 | struct iucv_message_pending *imp = (void *) data; | |
1544 | struct iucv_path *path = iucv_path_table[imp->ippathid]; | |
1545 | struct iucv_message msg; | |
1546 | ||
04b090d5 | 1547 | if (path && path->handler && path->handler->message_pending) { |
2356f4cb MS |
1548 | msg.flags = imp->ipflags1; |
1549 | msg.id = imp->ipmsgid; | |
1550 | msg.class = imp->iptrgcls; | |
1551 | if (imp->ipflags1 & IUCV_IPRMDATA) { | |
1552 | memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8); | |
1553 | msg.length = 8; | |
1554 | } else | |
1555 | msg.length = imp->ln1msg2.ipbfln1f; | |
1556 | msg.reply_size = imp->ipbfln2f; | |
1557 | path->handler->message_pending(path, &msg); | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | /** | |
04b090d5 | 1562 | * iucv_tasklet_fn: |
2356f4cb MS |
1563 | * |
1564 | * This tasklet loops over the queue of irq buffers created by | |
1565 | * iucv_external_interrupt, calls the appropriate action handler | |
1566 | * and then frees the buffer. | |
1567 | */ | |
04b090d5 | 1568 | static void iucv_tasklet_fn(unsigned long ignored) |
2356f4cb MS |
1569 | { |
1570 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
1571 | static iucv_irq_fn *irq_fn[] = { | |
2356f4cb MS |
1572 | [0x02] = iucv_path_complete, |
1573 | [0x03] = iucv_path_severed, | |
1574 | [0x04] = iucv_path_quiesced, | |
1575 | [0x05] = iucv_path_resumed, | |
1576 | [0x06] = iucv_message_complete, | |
1577 | [0x07] = iucv_message_complete, | |
1578 | [0x08] = iucv_message_pending, | |
1579 | [0x09] = iucv_message_pending, | |
1580 | }; | |
b5e78337 | 1581 | LIST_HEAD(task_queue); |
04b090d5 | 1582 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
1583 | |
1584 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
13fdc9a7 UB |
1585 | if (!spin_trylock(&iucv_table_lock)) { |
1586 | tasklet_schedule(&iucv_tasklet); | |
1587 | return; | |
1588 | } | |
04b090d5 | 1589 | iucv_active_cpu = smp_processor_id(); |
2356f4cb | 1590 | |
04b090d5 MS |
1591 | spin_lock_irq(&iucv_queue_lock); |
1592 | list_splice_init(&iucv_task_queue, &task_queue); | |
1593 | spin_unlock_irq(&iucv_queue_lock); | |
1594 | ||
1595 | list_for_each_entry_safe(p, n, &task_queue, list) { | |
2356f4cb | 1596 | list_del_init(&p->list); |
2356f4cb MS |
1597 | irq_fn[p->data.iptype](&p->data); |
1598 | kfree(p); | |
2356f4cb | 1599 | } |
2356f4cb | 1600 | |
04b090d5 | 1601 | iucv_active_cpu = -1; |
2356f4cb MS |
1602 | spin_unlock(&iucv_table_lock); |
1603 | } | |
1604 | ||
04b090d5 MS |
1605 | /** |
1606 | * iucv_work_fn: | |
1607 | * | |
1608 | * This work function loops over the queue of path pending irq blocks | |
1609 | * created by iucv_external_interrupt, calls the appropriate action | |
1610 | * handler and then frees the buffer. | |
1611 | */ | |
1612 | static void iucv_work_fn(struct work_struct *work) | |
1613 | { | |
1614 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
b5e78337 | 1615 | LIST_HEAD(work_queue); |
04b090d5 MS |
1616 | struct iucv_irq_list *p, *n; |
1617 | ||
1618 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
1619 | spin_lock_bh(&iucv_table_lock); | |
1620 | iucv_active_cpu = smp_processor_id(); | |
1621 | ||
1622 | spin_lock_irq(&iucv_queue_lock); | |
1623 | list_splice_init(&iucv_work_queue, &work_queue); | |
1624 | spin_unlock_irq(&iucv_queue_lock); | |
1625 | ||
1626 | iucv_cleanup_queue(); | |
1627 | list_for_each_entry_safe(p, n, &work_queue, list) { | |
1628 | list_del_init(&p->list); | |
1629 | iucv_path_pending(&p->data); | |
1630 | kfree(p); | |
1631 | } | |
1632 | ||
1633 | iucv_active_cpu = -1; | |
1634 | spin_unlock_bh(&iucv_table_lock); | |
1635 | } | |
1636 | ||
2356f4cb MS |
1637 | /** |
1638 | * iucv_external_interrupt | |
1639 | * @code: irq code | |
1640 | * | |
1641 | * Handles external interrupts coming in from CP. | |
04b090d5 | 1642 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
2356f4cb MS |
1643 | */ |
1644 | static void iucv_external_interrupt(u16 code) | |
1645 | { | |
1646 | struct iucv_irq_data *p; | |
04b090d5 | 1647 | struct iucv_irq_list *work; |
2356f4cb | 1648 | |
70cf5035 | 1649 | p = iucv_irq_data[smp_processor_id()]; |
2356f4cb | 1650 | if (p->ippathid >= iucv_max_pathid) { |
c2b4afd2 | 1651 | WARN_ON(p->ippathid >= iucv_max_pathid); |
2356f4cb MS |
1652 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
1653 | return; | |
1654 | } | |
c2b4afd2 | 1655 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
04b090d5 | 1656 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
2356f4cb | 1657 | if (!work) { |
8f7c502c | 1658 | pr_warning("iucv_external_interrupt: out of memory\n"); |
2356f4cb MS |
1659 | return; |
1660 | } | |
1661 | memcpy(&work->data, p, sizeof(work->data)); | |
04b090d5 MS |
1662 | spin_lock(&iucv_queue_lock); |
1663 | if (p->iptype == 0x01) { | |
1664 | /* Path pending interrupt. */ | |
1665 | list_add_tail(&work->list, &iucv_work_queue); | |
1666 | schedule_work(&iucv_work); | |
1667 | } else { | |
1668 | /* The other interrupts. */ | |
1669 | list_add_tail(&work->list, &iucv_task_queue); | |
1670 | tasklet_schedule(&iucv_tasklet); | |
1671 | } | |
1672 | spin_unlock(&iucv_queue_lock); | |
2356f4cb MS |
1673 | } |
1674 | ||
1675 | /** | |
1676 | * iucv_init | |
1677 | * | |
1678 | * Allocates and initializes various data structures. | |
1679 | */ | |
da99f056 | 1680 | static int __init iucv_init(void) |
2356f4cb MS |
1681 | { |
1682 | int rc; | |
70cf5035 | 1683 | int cpu; |
2356f4cb MS |
1684 | |
1685 | if (!MACHINE_IS_VM) { | |
1686 | rc = -EPROTONOSUPPORT; | |
1687 | goto out; | |
1688 | } | |
1689 | rc = iucv_query_maxconn(); | |
1690 | if (rc) | |
1691 | goto out; | |
da99f056 | 1692 | rc = register_external_interrupt(0x4000, iucv_external_interrupt); |
2356f4cb MS |
1693 | if (rc) |
1694 | goto out; | |
2356f4cb MS |
1695 | iucv_root = s390_root_dev_register("iucv"); |
1696 | if (IS_ERR(iucv_root)) { | |
1697 | rc = PTR_ERR(iucv_root); | |
2d7bf367 | 1698 | goto out_int; |
2356f4cb | 1699 | } |
70cf5035 CL |
1700 | |
1701 | for_each_online_cpu(cpu) { | |
1702 | /* Note: GFP_DMA used to get memory below 2G */ | |
1703 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), | |
1704 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1705 | if (!iucv_irq_data[cpu]) { | |
1706 | rc = -ENOMEM; | |
1707 | goto out_free; | |
1708 | } | |
1709 | ||
1710 | /* Allocate parameter blocks. */ | |
1711 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), | |
1712 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1713 | if (!iucv_param[cpu]) { | |
1714 | rc = -ENOMEM; | |
1715 | goto out_free; | |
1716 | } | |
2356f4cb | 1717 | } |
2d7bf367 CH |
1718 | rc = register_hotcpu_notifier(&iucv_cpu_notifier); |
1719 | if (rc) | |
1720 | goto out_free; | |
2356f4cb MS |
1721 | ASCEBC(iucv_error_no_listener, 16); |
1722 | ASCEBC(iucv_error_no_memory, 16); | |
1723 | ASCEBC(iucv_error_pathid, 16); | |
1724 | iucv_available = 1; | |
2d7bf367 CH |
1725 | rc = bus_register(&iucv_bus); |
1726 | if (rc) | |
1727 | goto out_cpu; | |
2356f4cb MS |
1728 | return 0; |
1729 | ||
2d7bf367 CH |
1730 | out_cpu: |
1731 | unregister_hotcpu_notifier(&iucv_cpu_notifier); | |
70cf5035 CL |
1732 | out_free: |
1733 | for_each_possible_cpu(cpu) { | |
1734 | kfree(iucv_param[cpu]); | |
1735 | iucv_param[cpu] = NULL; | |
1736 | kfree(iucv_irq_data[cpu]); | |
1737 | iucv_irq_data[cpu] = NULL; | |
1738 | } | |
2356f4cb | 1739 | s390_root_dev_unregister(iucv_root); |
2356f4cb MS |
1740 | out_int: |
1741 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
1742 | out: | |
1743 | return rc; | |
1744 | } | |
1745 | ||
1746 | /** | |
1747 | * iucv_exit | |
1748 | * | |
1749 | * Frees everything allocated from iucv_init. | |
1750 | */ | |
da99f056 | 1751 | static void __exit iucv_exit(void) |
2356f4cb | 1752 | { |
04b090d5 | 1753 | struct iucv_irq_list *p, *n; |
70cf5035 | 1754 | int cpu; |
2356f4cb | 1755 | |
04b090d5 MS |
1756 | spin_lock_irq(&iucv_queue_lock); |
1757 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) | |
1758 | kfree(p); | |
2356f4cb MS |
1759 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
1760 | kfree(p); | |
04b090d5 | 1761 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb | 1762 | unregister_hotcpu_notifier(&iucv_cpu_notifier); |
70cf5035 CL |
1763 | for_each_possible_cpu(cpu) { |
1764 | kfree(iucv_param[cpu]); | |
1765 | iucv_param[cpu] = NULL; | |
1766 | kfree(iucv_irq_data[cpu]); | |
1767 | iucv_irq_data[cpu] = NULL; | |
1768 | } | |
2356f4cb MS |
1769 | s390_root_dev_unregister(iucv_root); |
1770 | bus_unregister(&iucv_bus); | |
1771 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
1772 | } | |
1773 | ||
1774 | subsys_initcall(iucv_init); | |
1775 | module_exit(iucv_exit); | |
1776 | ||
2356f4cb MS |
1777 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
1778 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); | |
1779 | MODULE_LICENSE("GPL"); |