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de6cc651 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2356f4cb MS |
2 | /* |
3 | * IUCV base infrastructure. | |
4 | * | |
6c005961 UB |
5 | * Copyright IBM Corp. 2001, 2009 |
6 | * | |
2356f4cb MS |
7 | * Author(s): |
8 | * Original source: | |
9 | * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 | |
10 | * Xenia Tkatschow (xenia@us.ibm.com) | |
11 | * 2Gb awareness and general cleanup: | |
12 | * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) | |
13 | * Rewritten for af_iucv: | |
14 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
672e405b UB |
15 | * PM functions: |
16 | * Ursula Braun (ursula.braun@de.ibm.com) | |
2356f4cb MS |
17 | * |
18 | * Documentation used: | |
19 | * The original source | |
20 | * CP Programming Service, IBM document # SC24-5760 | |
2356f4cb MS |
21 | */ |
22 | ||
8f7c502c UB |
23 | #define KMSG_COMPONENT "iucv" |
24 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
25 | ||
052ff461 | 26 | #include <linux/kernel_stat.h> |
2356f4cb MS |
27 | #include <linux/module.h> |
28 | #include <linux/moduleparam.h> | |
2356f4cb MS |
29 | #include <linux/spinlock.h> |
30 | #include <linux/kernel.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/list.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/err.h> | |
37 | #include <linux/device.h> | |
38 | #include <linux/cpu.h> | |
6c005961 | 39 | #include <linux/reboot.h> |
2356f4cb | 40 | #include <net/iucv/iucv.h> |
60063497 | 41 | #include <linux/atomic.h> |
2356f4cb MS |
42 | #include <asm/ebcdic.h> |
43 | #include <asm/io.h> | |
d7b250e2 | 44 | #include <asm/irq.h> |
2356f4cb MS |
45 | #include <asm/smp.h> |
46 | ||
47 | /* | |
48 | * FLAGS: | |
49 | * All flags are defined in the field IPFLAGS1 of each function | |
50 | * and can be found in CP Programming Services. | |
51 | * IPSRCCLS - Indicates you have specified a source class. | |
52 | * IPTRGCLS - Indicates you have specified a target class. | |
53 | * IPFGPID - Indicates you have specified a pathid. | |
54 | * IPFGMID - Indicates you have specified a message ID. | |
55 | * IPNORPY - Indicates a one-way message. No reply expected. | |
56 | * IPALL - Indicates that all paths are affected. | |
57 | */ | |
58 | #define IUCV_IPSRCCLS 0x01 | |
59 | #define IUCV_IPTRGCLS 0x01 | |
60 | #define IUCV_IPFGPID 0x02 | |
61 | #define IUCV_IPFGMID 0x04 | |
62 | #define IUCV_IPNORPY 0x10 | |
63 | #define IUCV_IPALL 0x80 | |
64 | ||
da99f056 | 65 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
2356f4cb MS |
66 | { |
67 | return 0; | |
68 | } | |
69 | ||
4c89d86b UB |
70 | enum iucv_pm_states { |
71 | IUCV_PM_INITIAL = 0, | |
72 | IUCV_PM_FREEZING = 1, | |
73 | IUCV_PM_THAWING = 2, | |
74 | IUCV_PM_RESTORING = 3, | |
75 | }; | |
76 | static enum iucv_pm_states iucv_pm_state; | |
77 | ||
672e405b UB |
78 | static int iucv_pm_prepare(struct device *); |
79 | static void iucv_pm_complete(struct device *); | |
80 | static int iucv_pm_freeze(struct device *); | |
81 | static int iucv_pm_thaw(struct device *); | |
82 | static int iucv_pm_restore(struct device *); | |
83 | ||
47145210 | 84 | static const struct dev_pm_ops iucv_pm_ops = { |
672e405b UB |
85 | .prepare = iucv_pm_prepare, |
86 | .complete = iucv_pm_complete, | |
87 | .freeze = iucv_pm_freeze, | |
88 | .thaw = iucv_pm_thaw, | |
89 | .restore = iucv_pm_restore, | |
90 | }; | |
91 | ||
2356f4cb MS |
92 | struct bus_type iucv_bus = { |
93 | .name = "iucv", | |
94 | .match = iucv_bus_match, | |
672e405b | 95 | .pm = &iucv_pm_ops, |
2356f4cb | 96 | }; |
da99f056 | 97 | EXPORT_SYMBOL(iucv_bus); |
2356f4cb MS |
98 | |
99 | struct device *iucv_root; | |
da99f056 HC |
100 | EXPORT_SYMBOL(iucv_root); |
101 | ||
2356f4cb MS |
102 | static int iucv_available; |
103 | ||
104 | /* General IUCV interrupt structure */ | |
105 | struct iucv_irq_data { | |
106 | u16 ippathid; | |
107 | u8 ipflags1; | |
108 | u8 iptype; | |
109 | u32 res2[8]; | |
110 | }; | |
111 | ||
04b090d5 | 112 | struct iucv_irq_list { |
2356f4cb MS |
113 | struct list_head list; |
114 | struct iucv_irq_data data; | |
115 | }; | |
116 | ||
70cf5035 | 117 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
f2019030 KM |
118 | static cpumask_t iucv_buffer_cpumask = { CPU_BITS_NONE }; |
119 | static cpumask_t iucv_irq_cpumask = { CPU_BITS_NONE }; | |
2356f4cb | 120 | |
04b090d5 MS |
121 | /* |
122 | * Queue of interrupt buffers lock for delivery via the tasklet | |
123 | * (fast but can't call smp_call_function). | |
124 | */ | |
125 | static LIST_HEAD(iucv_task_queue); | |
126 | ||
127 | /* | |
128 | * The tasklet for fast delivery of iucv interrupts. | |
129 | */ | |
130 | static void iucv_tasklet_fn(unsigned long); | |
131 | static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0); | |
132 | ||
133 | /* | |
134 | * Queue of interrupt buffers for delivery via a work queue | |
135 | * (slower but can call smp_call_function). | |
136 | */ | |
137 | static LIST_HEAD(iucv_work_queue); | |
138 | ||
139 | /* | |
140 | * The work element to deliver path pending interrupts. | |
141 | */ | |
142 | static void iucv_work_fn(struct work_struct *work); | |
143 | static DECLARE_WORK(iucv_work, iucv_work_fn); | |
144 | ||
145 | /* | |
146 | * Spinlock protecting task and work queue. | |
147 | */ | |
148 | static DEFINE_SPINLOCK(iucv_queue_lock); | |
2356f4cb MS |
149 | |
150 | enum iucv_command_codes { | |
151 | IUCV_QUERY = 0, | |
152 | IUCV_RETRIEVE_BUFFER = 2, | |
153 | IUCV_SEND = 4, | |
154 | IUCV_RECEIVE = 5, | |
155 | IUCV_REPLY = 6, | |
156 | IUCV_REJECT = 8, | |
157 | IUCV_PURGE = 9, | |
158 | IUCV_ACCEPT = 10, | |
159 | IUCV_CONNECT = 11, | |
160 | IUCV_DECLARE_BUFFER = 12, | |
161 | IUCV_QUIESCE = 13, | |
162 | IUCV_RESUME = 14, | |
163 | IUCV_SEVER = 15, | |
164 | IUCV_SETMASK = 16, | |
672e405b | 165 | IUCV_SETCONTROLMASK = 17, |
2356f4cb MS |
166 | }; |
167 | ||
168 | /* | |
169 | * Error messages that are used with the iucv_sever function. They get | |
170 | * converted to EBCDIC. | |
171 | */ | |
172 | static char iucv_error_no_listener[16] = "NO LISTENER"; | |
173 | static char iucv_error_no_memory[16] = "NO MEMORY"; | |
174 | static char iucv_error_pathid[16] = "INVALID PATHID"; | |
175 | ||
176 | /* | |
177 | * iucv_handler_list: List of registered handlers. | |
178 | */ | |
179 | static LIST_HEAD(iucv_handler_list); | |
180 | ||
181 | /* | |
182 | * iucv_path_table: an array of iucv_path structures. | |
183 | */ | |
184 | static struct iucv_path **iucv_path_table; | |
185 | static unsigned long iucv_max_pathid; | |
186 | ||
187 | /* | |
188 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table | |
189 | */ | |
190 | static DEFINE_SPINLOCK(iucv_table_lock); | |
191 | ||
192 | /* | |
04b090d5 MS |
193 | * iucv_active_cpu: contains the number of the cpu executing the tasklet |
194 | * or the work handler. Needed for iucv_path_sever called from tasklet. | |
2356f4cb | 195 | */ |
04b090d5 | 196 | static int iucv_active_cpu = -1; |
2356f4cb MS |
197 | |
198 | /* | |
199 | * Mutex and wait queue for iucv_register/iucv_unregister. | |
200 | */ | |
201 | static DEFINE_MUTEX(iucv_register_mutex); | |
202 | ||
203 | /* | |
204 | * Counter for number of non-smp capable handlers. | |
205 | */ | |
206 | static int iucv_nonsmp_handler; | |
207 | ||
208 | /* | |
209 | * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, | |
210 | * iucv_path_quiesce and iucv_path_sever. | |
211 | */ | |
212 | struct iucv_cmd_control { | |
213 | u16 ippathid; | |
214 | u8 ipflags1; | |
215 | u8 iprcode; | |
216 | u16 ipmsglim; | |
217 | u16 res1; | |
218 | u8 ipvmid[8]; | |
219 | u8 ipuser[16]; | |
220 | u8 iptarget[8]; | |
221 | } __attribute__ ((packed,aligned(8))); | |
222 | ||
223 | /* | |
224 | * Data in parameter list iucv structure. Used by iucv_message_send, | |
225 | * iucv_message_send2way and iucv_message_reply. | |
226 | */ | |
227 | struct iucv_cmd_dpl { | |
228 | u16 ippathid; | |
229 | u8 ipflags1; | |
230 | u8 iprcode; | |
231 | u32 ipmsgid; | |
232 | u32 iptrgcls; | |
233 | u8 iprmmsg[8]; | |
234 | u32 ipsrccls; | |
235 | u32 ipmsgtag; | |
236 | u32 ipbfadr2; | |
237 | u32 ipbfln2f; | |
238 | u32 res; | |
239 | } __attribute__ ((packed,aligned(8))); | |
240 | ||
241 | /* | |
242 | * Data in buffer iucv structure. Used by iucv_message_receive, | |
243 | * iucv_message_reject, iucv_message_send, iucv_message_send2way | |
244 | * and iucv_declare_cpu. | |
245 | */ | |
246 | struct iucv_cmd_db { | |
247 | u16 ippathid; | |
248 | u8 ipflags1; | |
249 | u8 iprcode; | |
250 | u32 ipmsgid; | |
251 | u32 iptrgcls; | |
252 | u32 ipbfadr1; | |
253 | u32 ipbfln1f; | |
254 | u32 ipsrccls; | |
255 | u32 ipmsgtag; | |
256 | u32 ipbfadr2; | |
257 | u32 ipbfln2f; | |
258 | u32 res; | |
259 | } __attribute__ ((packed,aligned(8))); | |
260 | ||
261 | /* | |
262 | * Purge message iucv structure. Used by iucv_message_purge. | |
263 | */ | |
264 | struct iucv_cmd_purge { | |
265 | u16 ippathid; | |
266 | u8 ipflags1; | |
267 | u8 iprcode; | |
268 | u32 ipmsgid; | |
269 | u8 ipaudit[3]; | |
270 | u8 res1[5]; | |
271 | u32 res2; | |
272 | u32 ipsrccls; | |
273 | u32 ipmsgtag; | |
274 | u32 res3[3]; | |
275 | } __attribute__ ((packed,aligned(8))); | |
276 | ||
277 | /* | |
278 | * Set mask iucv structure. Used by iucv_enable_cpu. | |
279 | */ | |
280 | struct iucv_cmd_set_mask { | |
281 | u8 ipmask; | |
282 | u8 res1[2]; | |
283 | u8 iprcode; | |
284 | u32 res2[9]; | |
285 | } __attribute__ ((packed,aligned(8))); | |
286 | ||
287 | union iucv_param { | |
288 | struct iucv_cmd_control ctrl; | |
289 | struct iucv_cmd_dpl dpl; | |
290 | struct iucv_cmd_db db; | |
291 | struct iucv_cmd_purge purge; | |
292 | struct iucv_cmd_set_mask set_mask; | |
293 | }; | |
294 | ||
295 | /* | |
296 | * Anchor for per-cpu IUCV command parameter block. | |
297 | */ | |
70cf5035 | 298 | static union iucv_param *iucv_param[NR_CPUS]; |
42e1b4c2 | 299 | static union iucv_param *iucv_param_irq[NR_CPUS]; |
2356f4cb MS |
300 | |
301 | /** | |
302 | * iucv_call_b2f0 | |
303 | * @code: identifier of IUCV call to CP. | |
304 | * @parm: pointer to a struct iucv_parm block | |
305 | * | |
306 | * Calls CP to execute IUCV commands. | |
307 | * | |
308 | * Returns the result of the CP IUCV call. | |
309 | */ | |
eb090ad2 | 310 | static inline int __iucv_call_b2f0(int command, union iucv_param *parm) |
2356f4cb MS |
311 | { |
312 | register unsigned long reg0 asm ("0"); | |
313 | register unsigned long reg1 asm ("1"); | |
314 | int ccode; | |
315 | ||
316 | reg0 = command; | |
eb090ad2 | 317 | reg1 = (unsigned long)parm; |
2356f4cb MS |
318 | asm volatile( |
319 | " .long 0xb2f01000\n" | |
320 | " ipm %0\n" | |
321 | " srl %0,28\n" | |
322 | : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1) | |
323 | : "m" (*parm) : "cc"); | |
eb090ad2 HC |
324 | return ccode; |
325 | } | |
326 | ||
327 | static inline int iucv_call_b2f0(int command, union iucv_param *parm) | |
328 | { | |
329 | int ccode; | |
330 | ||
331 | ccode = __iucv_call_b2f0(command, parm); | |
332 | return ccode == 1 ? parm->ctrl.iprcode : ccode; | |
2356f4cb MS |
333 | } |
334 | ||
335 | /** | |
336 | * iucv_query_maxconn | |
337 | * | |
338 | * Determines the maximum number of connections that may be established. | |
339 | * | |
340 | * Returns the maximum number of connections or -EPERM is IUCV is not | |
341 | * available. | |
342 | */ | |
eb090ad2 | 343 | static int __iucv_query_maxconn(void *param, unsigned long *max_pathid) |
2356f4cb MS |
344 | { |
345 | register unsigned long reg0 asm ("0"); | |
346 | register unsigned long reg1 asm ("1"); | |
2356f4cb MS |
347 | int ccode; |
348 | ||
2356f4cb MS |
349 | reg0 = IUCV_QUERY; |
350 | reg1 = (unsigned long) param; | |
351 | asm volatile ( | |
352 | " .long 0xb2f01000\n" | |
353 | " ipm %0\n" | |
354 | " srl %0,28\n" | |
355 | : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc"); | |
eb090ad2 HC |
356 | *max_pathid = reg1; |
357 | return ccode; | |
358 | } | |
359 | ||
360 | static int iucv_query_maxconn(void) | |
361 | { | |
362 | unsigned long max_pathid; | |
363 | void *param; | |
364 | int ccode; | |
365 | ||
366 | param = kzalloc(sizeof(union iucv_param), GFP_KERNEL | GFP_DMA); | |
367 | if (!param) | |
368 | return -ENOMEM; | |
369 | ccode = __iucv_query_maxconn(param, &max_pathid); | |
2356f4cb | 370 | if (ccode == 0) |
eb090ad2 | 371 | iucv_max_pathid = max_pathid; |
2356f4cb MS |
372 | kfree(param); |
373 | return ccode ? -EPERM : 0; | |
374 | } | |
375 | ||
376 | /** | |
377 | * iucv_allow_cpu | |
378 | * @data: unused | |
379 | * | |
380 | * Allow iucv interrupts on this cpu. | |
381 | */ | |
382 | static void iucv_allow_cpu(void *data) | |
383 | { | |
384 | int cpu = smp_processor_id(); | |
385 | union iucv_param *parm; | |
386 | ||
387 | /* | |
388 | * Enable all iucv interrupts. | |
389 | * ipmask contains bits for the different interrupts | |
390 | * 0x80 - Flag to allow nonpriority message pending interrupts | |
391 | * 0x40 - Flag to allow priority message pending interrupts | |
392 | * 0x20 - Flag to allow nonpriority message completion interrupts | |
393 | * 0x10 - Flag to allow priority message completion interrupts | |
394 | * 0x08 - Flag to allow IUCV control interrupts | |
395 | */ | |
42e1b4c2 | 396 | parm = iucv_param_irq[cpu]; |
2356f4cb MS |
397 | memset(parm, 0, sizeof(union iucv_param)); |
398 | parm->set_mask.ipmask = 0xf8; | |
399 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
400 | ||
672e405b UB |
401 | /* |
402 | * Enable all iucv control interrupts. | |
403 | * ipmask contains bits for the different interrupts | |
404 | * 0x80 - Flag to allow pending connections interrupts | |
405 | * 0x40 - Flag to allow connection complete interrupts | |
406 | * 0x20 - Flag to allow connection severed interrupts | |
407 | * 0x10 - Flag to allow connection quiesced interrupts | |
408 | * 0x08 - Flag to allow connection resumed interrupts | |
409 | */ | |
410 | memset(parm, 0, sizeof(union iucv_param)); | |
411 | parm->set_mask.ipmask = 0xf8; | |
412 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); | |
2356f4cb | 413 | /* Set indication that iucv interrupts are allowed for this cpu. */ |
f2019030 | 414 | cpumask_set_cpu(cpu, &iucv_irq_cpumask); |
2356f4cb MS |
415 | } |
416 | ||
417 | /** | |
418 | * iucv_block_cpu | |
419 | * @data: unused | |
420 | * | |
421 | * Block iucv interrupts on this cpu. | |
422 | */ | |
423 | static void iucv_block_cpu(void *data) | |
424 | { | |
425 | int cpu = smp_processor_id(); | |
426 | union iucv_param *parm; | |
427 | ||
428 | /* Disable all iucv interrupts. */ | |
42e1b4c2 | 429 | parm = iucv_param_irq[cpu]; |
2356f4cb MS |
430 | memset(parm, 0, sizeof(union iucv_param)); |
431 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
432 | ||
433 | /* Clear indication that iucv interrupts are allowed for this cpu. */ | |
f2019030 | 434 | cpumask_clear_cpu(cpu, &iucv_irq_cpumask); |
2356f4cb MS |
435 | } |
436 | ||
672e405b UB |
437 | /** |
438 | * iucv_block_cpu_almost | |
439 | * @data: unused | |
440 | * | |
441 | * Allow connection-severed interrupts only on this cpu. | |
442 | */ | |
443 | static void iucv_block_cpu_almost(void *data) | |
444 | { | |
445 | int cpu = smp_processor_id(); | |
446 | union iucv_param *parm; | |
447 | ||
448 | /* Allow iucv control interrupts only */ | |
449 | parm = iucv_param_irq[cpu]; | |
450 | memset(parm, 0, sizeof(union iucv_param)); | |
451 | parm->set_mask.ipmask = 0x08; | |
452 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
453 | /* Allow iucv-severed interrupt only */ | |
454 | memset(parm, 0, sizeof(union iucv_param)); | |
455 | parm->set_mask.ipmask = 0x20; | |
456 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); | |
457 | ||
458 | /* Clear indication that iucv interrupts are allowed for this cpu. */ | |
f2019030 | 459 | cpumask_clear_cpu(cpu, &iucv_irq_cpumask); |
672e405b UB |
460 | } |
461 | ||
2356f4cb MS |
462 | /** |
463 | * iucv_declare_cpu | |
464 | * @data: unused | |
465 | * | |
3a4fa0a2 | 466 | * Declare a interrupt buffer on this cpu. |
2356f4cb MS |
467 | */ |
468 | static void iucv_declare_cpu(void *data) | |
469 | { | |
470 | int cpu = smp_processor_id(); | |
471 | union iucv_param *parm; | |
472 | int rc; | |
473 | ||
f2019030 | 474 | if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) |
2356f4cb MS |
475 | return; |
476 | ||
477 | /* Declare interrupt buffer. */ | |
42e1b4c2 | 478 | parm = iucv_param_irq[cpu]; |
2356f4cb | 479 | memset(parm, 0, sizeof(union iucv_param)); |
70cf5035 | 480 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
2356f4cb MS |
481 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
482 | if (rc) { | |
483 | char *err = "Unknown"; | |
da99f056 | 484 | switch (rc) { |
2356f4cb MS |
485 | case 0x03: |
486 | err = "Directory error"; | |
487 | break; | |
488 | case 0x0a: | |
489 | err = "Invalid length"; | |
490 | break; | |
491 | case 0x13: | |
492 | err = "Buffer already exists"; | |
493 | break; | |
494 | case 0x3e: | |
495 | err = "Buffer overlap"; | |
496 | break; | |
497 | case 0x5c: | |
498 | err = "Paging or storage error"; | |
499 | break; | |
500 | } | |
47c4cfc3 JP |
501 | pr_warn("Defining an interrupt buffer on CPU %i failed with 0x%02x (%s)\n", |
502 | cpu, rc, err); | |
2356f4cb MS |
503 | return; |
504 | } | |
505 | ||
506 | /* Set indication that an iucv buffer exists for this cpu. */ | |
f2019030 | 507 | cpumask_set_cpu(cpu, &iucv_buffer_cpumask); |
2356f4cb | 508 | |
f2019030 | 509 | if (iucv_nonsmp_handler == 0 || cpumask_empty(&iucv_irq_cpumask)) |
2356f4cb MS |
510 | /* Enable iucv interrupts on this cpu. */ |
511 | iucv_allow_cpu(NULL); | |
512 | else | |
513 | /* Disable iucv interrupts on this cpu. */ | |
514 | iucv_block_cpu(NULL); | |
515 | } | |
516 | ||
517 | /** | |
518 | * iucv_retrieve_cpu | |
519 | * @data: unused | |
520 | * | |
521 | * Retrieve interrupt buffer on this cpu. | |
522 | */ | |
523 | static void iucv_retrieve_cpu(void *data) | |
524 | { | |
525 | int cpu = smp_processor_id(); | |
526 | union iucv_param *parm; | |
527 | ||
f2019030 | 528 | if (!cpumask_test_cpu(cpu, &iucv_buffer_cpumask)) |
2356f4cb MS |
529 | return; |
530 | ||
531 | /* Block iucv interrupts. */ | |
532 | iucv_block_cpu(NULL); | |
533 | ||
534 | /* Retrieve interrupt buffer. */ | |
42e1b4c2 | 535 | parm = iucv_param_irq[cpu]; |
2356f4cb MS |
536 | iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); |
537 | ||
538 | /* Clear indication that an iucv buffer exists for this cpu. */ | |
f2019030 | 539 | cpumask_clear_cpu(cpu, &iucv_buffer_cpumask); |
2356f4cb MS |
540 | } |
541 | ||
542 | /** | |
543 | * iucv_setmask_smp | |
544 | * | |
545 | * Allow iucv interrupts on all cpus. | |
546 | */ | |
547 | static void iucv_setmask_mp(void) | |
548 | { | |
549 | int cpu; | |
550 | ||
7b9d1b22 | 551 | get_online_cpus(); |
2356f4cb MS |
552 | for_each_online_cpu(cpu) |
553 | /* Enable all cpus with a declared buffer. */ | |
f2019030 KM |
554 | if (cpumask_test_cpu(cpu, &iucv_buffer_cpumask) && |
555 | !cpumask_test_cpu(cpu, &iucv_irq_cpumask)) | |
3bb447fc | 556 | smp_call_function_single(cpu, iucv_allow_cpu, |
8691e5a8 | 557 | NULL, 1); |
7b9d1b22 | 558 | put_online_cpus(); |
2356f4cb MS |
559 | } |
560 | ||
561 | /** | |
562 | * iucv_setmask_up | |
563 | * | |
04b090d5 | 564 | * Allow iucv interrupts on a single cpu. |
2356f4cb MS |
565 | */ |
566 | static void iucv_setmask_up(void) | |
567 | { | |
568 | cpumask_t cpumask; | |
569 | int cpu; | |
570 | ||
571 | /* Disable all cpu but the first in cpu_irq_cpumask. */ | |
f2019030 KM |
572 | cpumask_copy(&cpumask, &iucv_irq_cpumask); |
573 | cpumask_clear_cpu(cpumask_first(&iucv_irq_cpumask), &cpumask); | |
574 | for_each_cpu(cpu, &cpumask) | |
8691e5a8 | 575 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
2356f4cb MS |
576 | } |
577 | ||
578 | /** | |
579 | * iucv_enable | |
580 | * | |
581 | * This function makes iucv ready for use. It allocates the pathid | |
582 | * table, declares an iucv interrupt buffer and enables the iucv | |
583 | * interrupts. Called when the first user has registered an iucv | |
584 | * handler. | |
585 | */ | |
586 | static int iucv_enable(void) | |
587 | { | |
588 | size_t alloc_size; | |
589 | int cpu, rc; | |
590 | ||
f1d3e4dc | 591 | get_online_cpus(); |
2356f4cb MS |
592 | rc = -ENOMEM; |
593 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); | |
594 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); | |
595 | if (!iucv_path_table) | |
596 | goto out; | |
597 | /* Declare per cpu buffers. */ | |
598 | rc = -EIO; | |
599 | for_each_online_cpu(cpu) | |
8691e5a8 | 600 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
f2019030 | 601 | if (cpumask_empty(&iucv_buffer_cpumask)) |
2356f4cb | 602 | /* No cpu could declare an iucv buffer. */ |
f1d3e4dc | 603 | goto out; |
7b9d1b22 | 604 | put_online_cpus(); |
2356f4cb | 605 | return 0; |
2356f4cb | 606 | out: |
f1d3e4dc HC |
607 | kfree(iucv_path_table); |
608 | iucv_path_table = NULL; | |
609 | put_online_cpus(); | |
2356f4cb MS |
610 | return rc; |
611 | } | |
612 | ||
613 | /** | |
614 | * iucv_disable | |
615 | * | |
616 | * This function shuts down iucv. It disables iucv interrupts, retrieves | |
617 | * the iucv interrupt buffer and frees the pathid table. Called after the | |
618 | * last user unregister its iucv handler. | |
619 | */ | |
620 | static void iucv_disable(void) | |
621 | { | |
8b122efd | 622 | get_online_cpus(); |
15c8b6c1 | 623 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 624 | kfree(iucv_path_table); |
f1d3e4dc HC |
625 | iucv_path_table = NULL; |
626 | put_online_cpus(); | |
2356f4cb MS |
627 | } |
628 | ||
38b48292 | 629 | static int iucv_cpu_dead(unsigned int cpu) |
a0e247a8 SB |
630 | { |
631 | kfree(iucv_param_irq[cpu]); | |
632 | iucv_param_irq[cpu] = NULL; | |
633 | kfree(iucv_param[cpu]); | |
634 | iucv_param[cpu] = NULL; | |
635 | kfree(iucv_irq_data[cpu]); | |
636 | iucv_irq_data[cpu] = NULL; | |
38b48292 | 637 | return 0; |
a0e247a8 SB |
638 | } |
639 | ||
38b48292 | 640 | static int iucv_cpu_prepare(unsigned int cpu) |
a0e247a8 SB |
641 | { |
642 | /* Note: GFP_DMA used to get memory below 2G */ | |
643 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), | |
644 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
645 | if (!iucv_irq_data[cpu]) | |
646 | goto out_free; | |
647 | ||
648 | /* Allocate parameter blocks. */ | |
649 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), | |
650 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
651 | if (!iucv_param[cpu]) | |
652 | goto out_free; | |
653 | ||
654 | iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), | |
655 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
656 | if (!iucv_param_irq[cpu]) | |
657 | goto out_free; | |
658 | ||
659 | return 0; | |
660 | ||
661 | out_free: | |
38b48292 | 662 | iucv_cpu_dead(cpu); |
a0e247a8 SB |
663 | return -ENOMEM; |
664 | } | |
665 | ||
38b48292 | 666 | static int iucv_cpu_online(unsigned int cpu) |
2356f4cb | 667 | { |
38b48292 SAS |
668 | if (!iucv_path_table) |
669 | return 0; | |
670 | iucv_declare_cpu(NULL); | |
671 | return 0; | |
2356f4cb MS |
672 | } |
673 | ||
38b48292 SAS |
674 | static int iucv_cpu_down_prep(unsigned int cpu) |
675 | { | |
676 | cpumask_t cpumask; | |
677 | ||
678 | if (!iucv_path_table) | |
679 | return 0; | |
680 | ||
681 | cpumask_copy(&cpumask, &iucv_buffer_cpumask); | |
682 | cpumask_clear_cpu(cpu, &cpumask); | |
683 | if (cpumask_empty(&cpumask)) | |
684 | /* Can't offline last IUCV enabled cpu. */ | |
685 | return -EINVAL; | |
686 | ||
687 | iucv_retrieve_cpu(NULL); | |
688 | if (!cpumask_empty(&iucv_irq_cpumask)) | |
689 | return 0; | |
690 | smp_call_function_single(cpumask_first(&iucv_buffer_cpumask), | |
691 | iucv_allow_cpu, NULL, 1); | |
692 | return 0; | |
693 | } | |
2356f4cb MS |
694 | |
695 | /** | |
696 | * iucv_sever_pathid | |
697 | * @pathid: path identification number. | |
698 | * @userdata: 16-bytes of user data. | |
699 | * | |
700 | * Sever an iucv path to free up the pathid. Used internally. | |
701 | */ | |
91e60eb6 | 702 | static int iucv_sever_pathid(u16 pathid, u8 *userdata) |
2356f4cb MS |
703 | { |
704 | union iucv_param *parm; | |
705 | ||
42e1b4c2 | 706 | parm = iucv_param_irq[smp_processor_id()]; |
2356f4cb MS |
707 | memset(parm, 0, sizeof(union iucv_param)); |
708 | if (userdata) | |
709 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
710 | parm->ctrl.ippathid = pathid; | |
711 | return iucv_call_b2f0(IUCV_SEVER, parm); | |
712 | } | |
713 | ||
714 | /** | |
04b090d5 | 715 | * __iucv_cleanup_queue |
2356f4cb MS |
716 | * @dummy: unused dummy argument |
717 | * | |
718 | * Nop function called via smp_call_function to force work items from | |
719 | * pending external iucv interrupts to the work queue. | |
720 | */ | |
04b090d5 | 721 | static void __iucv_cleanup_queue(void *dummy) |
2356f4cb MS |
722 | { |
723 | } | |
724 | ||
725 | /** | |
04b090d5 | 726 | * iucv_cleanup_queue |
2356f4cb MS |
727 | * |
728 | * Function called after a path has been severed to find all remaining | |
729 | * work items for the now stale pathid. The caller needs to hold the | |
730 | * iucv_table_lock. | |
731 | */ | |
04b090d5 | 732 | static void iucv_cleanup_queue(void) |
2356f4cb | 733 | { |
04b090d5 | 734 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
735 | |
736 | /* | |
25985edc | 737 | * When a path is severed, the pathid can be reused immediately |
04b090d5 MS |
738 | * on a iucv connect or a connection pending interrupt. Remove |
739 | * all entries from the task queue that refer to a stale pathid | |
740 | * (iucv_path_table[ix] == NULL). Only then do the iucv connect | |
741 | * or deliver the connection pending interrupt. To get all the | |
742 | * pending interrupts force them to the work queue by calling | |
743 | * an empty function on all cpus. | |
2356f4cb | 744 | */ |
8691e5a8 | 745 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
04b090d5 MS |
746 | spin_lock_irq(&iucv_queue_lock); |
747 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) { | |
748 | /* Remove stale work items from the task queue. */ | |
749 | if (iucv_path_table[p->data.ippathid] == NULL) { | |
2356f4cb MS |
750 | list_del(&p->list); |
751 | kfree(p); | |
752 | } | |
753 | } | |
04b090d5 | 754 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb MS |
755 | } |
756 | ||
757 | /** | |
758 | * iucv_register: | |
759 | * @handler: address of iucv handler structure | |
760 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
761 | * | |
762 | * Registers a driver with IUCV. | |
763 | * | |
764 | * Returns 0 on success, -ENOMEM if the memory allocation for the pathid | |
765 | * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. | |
766 | */ | |
767 | int iucv_register(struct iucv_handler *handler, int smp) | |
768 | { | |
769 | int rc; | |
770 | ||
771 | if (!iucv_available) | |
772 | return -ENOSYS; | |
773 | mutex_lock(&iucv_register_mutex); | |
774 | if (!smp) | |
775 | iucv_nonsmp_handler++; | |
776 | if (list_empty(&iucv_handler_list)) { | |
777 | rc = iucv_enable(); | |
778 | if (rc) | |
779 | goto out_mutex; | |
780 | } else if (!smp && iucv_nonsmp_handler == 1) | |
781 | iucv_setmask_up(); | |
782 | INIT_LIST_HEAD(&handler->paths); | |
783 | ||
435bc9df | 784 | spin_lock_bh(&iucv_table_lock); |
2356f4cb | 785 | list_add_tail(&handler->list, &iucv_handler_list); |
435bc9df | 786 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
787 | rc = 0; |
788 | out_mutex: | |
789 | mutex_unlock(&iucv_register_mutex); | |
790 | return rc; | |
791 | } | |
da99f056 | 792 | EXPORT_SYMBOL(iucv_register); |
2356f4cb MS |
793 | |
794 | /** | |
795 | * iucv_unregister | |
796 | * @handler: address of iucv handler structure | |
797 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
798 | * | |
799 | * Unregister driver from IUCV. | |
800 | */ | |
801 | void iucv_unregister(struct iucv_handler *handler, int smp) | |
802 | { | |
803 | struct iucv_path *p, *n; | |
804 | ||
805 | mutex_lock(&iucv_register_mutex); | |
806 | spin_lock_bh(&iucv_table_lock); | |
807 | /* Remove handler from the iucv_handler_list. */ | |
808 | list_del_init(&handler->list); | |
25985edc | 809 | /* Sever all pathids still referring to the handler. */ |
2356f4cb MS |
810 | list_for_each_entry_safe(p, n, &handler->paths, list) { |
811 | iucv_sever_pathid(p->pathid, NULL); | |
812 | iucv_path_table[p->pathid] = NULL; | |
813 | list_del(&p->list); | |
2356f4cb MS |
814 | iucv_path_free(p); |
815 | } | |
816 | spin_unlock_bh(&iucv_table_lock); | |
817 | if (!smp) | |
818 | iucv_nonsmp_handler--; | |
819 | if (list_empty(&iucv_handler_list)) | |
820 | iucv_disable(); | |
821 | else if (!smp && iucv_nonsmp_handler == 0) | |
822 | iucv_setmask_mp(); | |
823 | mutex_unlock(&iucv_register_mutex); | |
824 | } | |
da99f056 | 825 | EXPORT_SYMBOL(iucv_unregister); |
2356f4cb | 826 | |
6c005961 UB |
827 | static int iucv_reboot_event(struct notifier_block *this, |
828 | unsigned long event, void *ptr) | |
829 | { | |
5db79c06 | 830 | int i; |
6c005961 | 831 | |
c0048de2 HB |
832 | if (cpumask_empty(&iucv_irq_cpumask)) |
833 | return NOTIFY_DONE; | |
834 | ||
6c005961 | 835 | get_online_cpus(); |
c0048de2 | 836 | on_each_cpu_mask(&iucv_irq_cpumask, iucv_block_cpu, NULL, 1); |
6c005961 UB |
837 | preempt_disable(); |
838 | for (i = 0; i < iucv_max_pathid; i++) { | |
839 | if (iucv_path_table[i]) | |
5db79c06 | 840 | iucv_sever_pathid(i, NULL); |
6c005961 UB |
841 | } |
842 | preempt_enable(); | |
843 | put_online_cpus(); | |
844 | iucv_disable(); | |
845 | return NOTIFY_DONE; | |
846 | } | |
847 | ||
848 | static struct notifier_block iucv_reboot_notifier = { | |
849 | .notifier_call = iucv_reboot_event, | |
850 | }; | |
851 | ||
2356f4cb MS |
852 | /** |
853 | * iucv_path_accept | |
854 | * @path: address of iucv path structure | |
855 | * @handler: address of iucv handler structure | |
856 | * @userdata: 16 bytes of data reflected to the communication partner | |
857 | * @private: private data passed to interrupt handlers for this path | |
858 | * | |
859 | * This function is issued after the user received a connection pending | |
860 | * external interrupt and now wishes to complete the IUCV communication path. | |
861 | * | |
862 | * Returns the result of the CP IUCV call. | |
863 | */ | |
864 | int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, | |
91e60eb6 | 865 | u8 *userdata, void *private) |
2356f4cb MS |
866 | { |
867 | union iucv_param *parm; | |
868 | int rc; | |
869 | ||
870 | local_bh_disable(); | |
f2019030 | 871 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
872 | rc = -EIO; |
873 | goto out; | |
874 | } | |
2356f4cb | 875 | /* Prepare parameter block. */ |
70cf5035 | 876 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
877 | memset(parm, 0, sizeof(union iucv_param)); |
878 | parm->ctrl.ippathid = path->pathid; | |
879 | parm->ctrl.ipmsglim = path->msglim; | |
880 | if (userdata) | |
881 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
882 | parm->ctrl.ipflags1 = path->flags; | |
883 | ||
884 | rc = iucv_call_b2f0(IUCV_ACCEPT, parm); | |
885 | if (!rc) { | |
886 | path->private = private; | |
887 | path->msglim = parm->ctrl.ipmsglim; | |
888 | path->flags = parm->ctrl.ipflags1; | |
889 | } | |
6c005961 | 890 | out: |
2356f4cb MS |
891 | local_bh_enable(); |
892 | return rc; | |
893 | } | |
da99f056 | 894 | EXPORT_SYMBOL(iucv_path_accept); |
2356f4cb MS |
895 | |
896 | /** | |
897 | * iucv_path_connect | |
898 | * @path: address of iucv path structure | |
899 | * @handler: address of iucv handler structure | |
900 | * @userid: 8-byte user identification | |
901 | * @system: 8-byte target system identification | |
902 | * @userdata: 16 bytes of data reflected to the communication partner | |
903 | * @private: private data passed to interrupt handlers for this path | |
904 | * | |
905 | * This function establishes an IUCV path. Although the connect may complete | |
906 | * successfully, you are not able to use the path until you receive an IUCV | |
907 | * Connection Complete external interrupt. | |
908 | * | |
909 | * Returns the result of the CP IUCV call. | |
910 | */ | |
911 | int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, | |
91e60eb6 | 912 | u8 *userid, u8 *system, u8 *userdata, |
2356f4cb MS |
913 | void *private) |
914 | { | |
915 | union iucv_param *parm; | |
916 | int rc; | |
917 | ||
04b090d5 MS |
918 | spin_lock_bh(&iucv_table_lock); |
919 | iucv_cleanup_queue(); | |
f2019030 | 920 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
921 | rc = -EIO; |
922 | goto out; | |
923 | } | |
70cf5035 | 924 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
925 | memset(parm, 0, sizeof(union iucv_param)); |
926 | parm->ctrl.ipmsglim = path->msglim; | |
927 | parm->ctrl.ipflags1 = path->flags; | |
928 | if (userid) { | |
929 | memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); | |
930 | ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
931 | EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
932 | } | |
933 | if (system) { | |
934 | memcpy(parm->ctrl.iptarget, system, | |
935 | sizeof(parm->ctrl.iptarget)); | |
936 | ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
937 | EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
938 | } | |
939 | if (userdata) | |
940 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
941 | ||
942 | rc = iucv_call_b2f0(IUCV_CONNECT, parm); | |
943 | if (!rc) { | |
944 | if (parm->ctrl.ippathid < iucv_max_pathid) { | |
945 | path->pathid = parm->ctrl.ippathid; | |
946 | path->msglim = parm->ctrl.ipmsglim; | |
947 | path->flags = parm->ctrl.ipflags1; | |
948 | path->handler = handler; | |
949 | path->private = private; | |
950 | list_add_tail(&path->list, &handler->paths); | |
951 | iucv_path_table[path->pathid] = path; | |
952 | } else { | |
953 | iucv_sever_pathid(parm->ctrl.ippathid, | |
954 | iucv_error_pathid); | |
955 | rc = -EIO; | |
956 | } | |
957 | } | |
6c005961 | 958 | out: |
04b090d5 | 959 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
960 | return rc; |
961 | } | |
da99f056 | 962 | EXPORT_SYMBOL(iucv_path_connect); |
2356f4cb MS |
963 | |
964 | /** | |
965 | * iucv_path_quiesce: | |
966 | * @path: address of iucv path structure | |
967 | * @userdata: 16 bytes of data reflected to the communication partner | |
968 | * | |
969 | * This function temporarily suspends incoming messages on an IUCV path. | |
970 | * You can later reactivate the path by invoking the iucv_resume function. | |
971 | * | |
972 | * Returns the result from the CP IUCV call. | |
973 | */ | |
91e60eb6 | 974 | int iucv_path_quiesce(struct iucv_path *path, u8 *userdata) |
2356f4cb MS |
975 | { |
976 | union iucv_param *parm; | |
977 | int rc; | |
978 | ||
979 | local_bh_disable(); | |
f2019030 | 980 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
981 | rc = -EIO; |
982 | goto out; | |
983 | } | |
70cf5035 | 984 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
985 | memset(parm, 0, sizeof(union iucv_param)); |
986 | if (userdata) | |
987 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
988 | parm->ctrl.ippathid = path->pathid; | |
989 | rc = iucv_call_b2f0(IUCV_QUIESCE, parm); | |
6c005961 | 990 | out: |
2356f4cb MS |
991 | local_bh_enable(); |
992 | return rc; | |
993 | } | |
da99f056 | 994 | EXPORT_SYMBOL(iucv_path_quiesce); |
2356f4cb MS |
995 | |
996 | /** | |
997 | * iucv_path_resume: | |
998 | * @path: address of iucv path structure | |
999 | * @userdata: 16 bytes of data reflected to the communication partner | |
1000 | * | |
1001 | * This function resumes incoming messages on an IUCV path that has | |
1002 | * been stopped with iucv_path_quiesce. | |
1003 | * | |
1004 | * Returns the result from the CP IUCV call. | |
1005 | */ | |
91e60eb6 | 1006 | int iucv_path_resume(struct iucv_path *path, u8 *userdata) |
2356f4cb MS |
1007 | { |
1008 | union iucv_param *parm; | |
1009 | int rc; | |
1010 | ||
1011 | local_bh_disable(); | |
f2019030 | 1012 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1013 | rc = -EIO; |
1014 | goto out; | |
1015 | } | |
70cf5035 | 1016 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1017 | memset(parm, 0, sizeof(union iucv_param)); |
1018 | if (userdata) | |
1019 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
1020 | parm->ctrl.ippathid = path->pathid; | |
1021 | rc = iucv_call_b2f0(IUCV_RESUME, parm); | |
6c005961 | 1022 | out: |
2356f4cb MS |
1023 | local_bh_enable(); |
1024 | return rc; | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * iucv_path_sever | |
1029 | * @path: address of iucv path structure | |
1030 | * @userdata: 16 bytes of data reflected to the communication partner | |
1031 | * | |
1032 | * This function terminates an IUCV path. | |
1033 | * | |
1034 | * Returns the result from the CP IUCV call. | |
1035 | */ | |
91e60eb6 | 1036 | int iucv_path_sever(struct iucv_path *path, u8 *userdata) |
2356f4cb MS |
1037 | { |
1038 | int rc; | |
1039 | ||
2356f4cb | 1040 | preempt_disable(); |
f2019030 | 1041 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1042 | rc = -EIO; |
1043 | goto out; | |
1044 | } | |
04b090d5 | 1045 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
1046 | spin_lock_bh(&iucv_table_lock); |
1047 | rc = iucv_sever_pathid(path->pathid, userdata); | |
42e1b4c2 UB |
1048 | iucv_path_table[path->pathid] = NULL; |
1049 | list_del_init(&path->list); | |
04b090d5 | 1050 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb | 1051 | spin_unlock_bh(&iucv_table_lock); |
6c005961 | 1052 | out: |
2356f4cb MS |
1053 | preempt_enable(); |
1054 | return rc; | |
1055 | } | |
da99f056 | 1056 | EXPORT_SYMBOL(iucv_path_sever); |
2356f4cb MS |
1057 | |
1058 | /** | |
1059 | * iucv_message_purge | |
1060 | * @path: address of iucv path structure | |
1061 | * @msg: address of iucv msg structure | |
1062 | * @srccls: source class of message | |
1063 | * | |
1064 | * Cancels a message you have sent. | |
1065 | * | |
1066 | * Returns the result from the CP IUCV call. | |
1067 | */ | |
1068 | int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, | |
1069 | u32 srccls) | |
1070 | { | |
1071 | union iucv_param *parm; | |
1072 | int rc; | |
1073 | ||
1074 | local_bh_disable(); | |
f2019030 | 1075 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1076 | rc = -EIO; |
1077 | goto out; | |
1078 | } | |
70cf5035 | 1079 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1080 | memset(parm, 0, sizeof(union iucv_param)); |
1081 | parm->purge.ippathid = path->pathid; | |
1082 | parm->purge.ipmsgid = msg->id; | |
1083 | parm->purge.ipsrccls = srccls; | |
1084 | parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; | |
1085 | rc = iucv_call_b2f0(IUCV_PURGE, parm); | |
1086 | if (!rc) { | |
1087 | msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; | |
1088 | msg->tag = parm->purge.ipmsgtag; | |
1089 | } | |
6c005961 | 1090 | out: |
2356f4cb MS |
1091 | local_bh_enable(); |
1092 | return rc; | |
1093 | } | |
da99f056 | 1094 | EXPORT_SYMBOL(iucv_message_purge); |
2356f4cb MS |
1095 | |
1096 | /** | |
91d5d45e HB |
1097 | * iucv_message_receive_iprmdata |
1098 | * @path: address of iucv path structure | |
1099 | * @msg: address of iucv msg structure | |
1100 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1101 | * @buffer: address of data buffer or address of struct iucv_array | |
1102 | * @size: length of data buffer | |
1103 | * @residual: | |
1104 | * | |
1105 | * Internal function used by iucv_message_receive and __iucv_message_receive | |
1106 | * to receive RMDATA data stored in struct iucv_message. | |
1107 | */ | |
1108 | static int iucv_message_receive_iprmdata(struct iucv_path *path, | |
1109 | struct iucv_message *msg, | |
1110 | u8 flags, void *buffer, | |
1111 | size_t size, size_t *residual) | |
1112 | { | |
1113 | struct iucv_array *array; | |
1114 | u8 *rmmsg; | |
1115 | size_t copy; | |
1116 | ||
1117 | /* | |
1118 | * Message is 8 bytes long and has been stored to the | |
1119 | * message descriptor itself. | |
1120 | */ | |
1121 | if (residual) | |
1122 | *residual = abs(size - 8); | |
1123 | rmmsg = msg->rmmsg; | |
1124 | if (flags & IUCV_IPBUFLST) { | |
1125 | /* Copy to struct iucv_array. */ | |
1126 | size = (size < 8) ? size : 8; | |
1127 | for (array = buffer; size > 0; array++) { | |
1128 | copy = min_t(size_t, size, array->length); | |
1129 | memcpy((u8 *)(addr_t) array->address, | |
1130 | rmmsg, copy); | |
1131 | rmmsg += copy; | |
1132 | size -= copy; | |
1133 | } | |
1134 | } else { | |
1135 | /* Copy to direct buffer. */ | |
1136 | memcpy(buffer, rmmsg, min_t(size_t, size, 8)); | |
1137 | } | |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | /** | |
1142 | * __iucv_message_receive | |
2356f4cb MS |
1143 | * @path: address of iucv path structure |
1144 | * @msg: address of iucv msg structure | |
1145 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1146 | * @buffer: address of data buffer or address of struct iucv_array | |
1147 | * @size: length of data buffer | |
1148 | * @residual: | |
1149 | * | |
1150 | * This function receives messages that are being sent to you over | |
1151 | * established paths. This function will deal with RMDATA messages | |
1152 | * embedded in struct iucv_message as well. | |
1153 | * | |
91d5d45e HB |
1154 | * Locking: no locking |
1155 | * | |
2356f4cb MS |
1156 | * Returns the result from the CP IUCV call. |
1157 | */ | |
91d5d45e HB |
1158 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1159 | u8 flags, void *buffer, size_t size, size_t *residual) | |
2356f4cb MS |
1160 | { |
1161 | union iucv_param *parm; | |
2356f4cb MS |
1162 | int rc; |
1163 | ||
91d5d45e HB |
1164 | if (msg->flags & IUCV_IPRMDATA) |
1165 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1166 | buffer, size, residual); | |
f2019030 | 1167 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1168 | rc = -EIO; |
1169 | goto out; | |
1170 | } | |
70cf5035 | 1171 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1172 | memset(parm, 0, sizeof(union iucv_param)); |
1173 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1174 | parm->db.ipbfln1f = (u32) size; | |
1175 | parm->db.ipmsgid = msg->id; | |
1176 | parm->db.ippathid = path->pathid; | |
1177 | parm->db.iptrgcls = msg->class; | |
1178 | parm->db.ipflags1 = (flags | IUCV_IPFGPID | | |
1179 | IUCV_IPFGMID | IUCV_IPTRGCLS); | |
1180 | rc = iucv_call_b2f0(IUCV_RECEIVE, parm); | |
1181 | if (!rc || rc == 5) { | |
1182 | msg->flags = parm->db.ipflags1; | |
1183 | if (residual) | |
1184 | *residual = parm->db.ipbfln1f; | |
1185 | } | |
6c005961 | 1186 | out: |
91d5d45e HB |
1187 | return rc; |
1188 | } | |
1189 | EXPORT_SYMBOL(__iucv_message_receive); | |
1190 | ||
1191 | /** | |
1192 | * iucv_message_receive | |
1193 | * @path: address of iucv path structure | |
1194 | * @msg: address of iucv msg structure | |
1195 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1196 | * @buffer: address of data buffer or address of struct iucv_array | |
1197 | * @size: length of data buffer | |
1198 | * @residual: | |
1199 | * | |
1200 | * This function receives messages that are being sent to you over | |
1201 | * established paths. This function will deal with RMDATA messages | |
1202 | * embedded in struct iucv_message as well. | |
1203 | * | |
1204 | * Locking: local_bh_enable/local_bh_disable | |
1205 | * | |
1206 | * Returns the result from the CP IUCV call. | |
1207 | */ | |
1208 | int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, | |
1209 | u8 flags, void *buffer, size_t size, size_t *residual) | |
1210 | { | |
1211 | int rc; | |
1212 | ||
1213 | if (msg->flags & IUCV_IPRMDATA) | |
1214 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1215 | buffer, size, residual); | |
1216 | local_bh_disable(); | |
1217 | rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); | |
2356f4cb MS |
1218 | local_bh_enable(); |
1219 | return rc; | |
1220 | } | |
da99f056 | 1221 | EXPORT_SYMBOL(iucv_message_receive); |
2356f4cb MS |
1222 | |
1223 | /** | |
1224 | * iucv_message_reject | |
1225 | * @path: address of iucv path structure | |
1226 | * @msg: address of iucv msg structure | |
1227 | * | |
1228 | * The reject function refuses a specified message. Between the time you | |
1229 | * are notified of a message and the time that you complete the message, | |
1230 | * the message may be rejected. | |
1231 | * | |
1232 | * Returns the result from the CP IUCV call. | |
1233 | */ | |
1234 | int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) | |
1235 | { | |
1236 | union iucv_param *parm; | |
1237 | int rc; | |
1238 | ||
1239 | local_bh_disable(); | |
f2019030 | 1240 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1241 | rc = -EIO; |
1242 | goto out; | |
1243 | } | |
70cf5035 | 1244 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1245 | memset(parm, 0, sizeof(union iucv_param)); |
1246 | parm->db.ippathid = path->pathid; | |
1247 | parm->db.ipmsgid = msg->id; | |
1248 | parm->db.iptrgcls = msg->class; | |
1249 | parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); | |
1250 | rc = iucv_call_b2f0(IUCV_REJECT, parm); | |
6c005961 | 1251 | out: |
2356f4cb MS |
1252 | local_bh_enable(); |
1253 | return rc; | |
1254 | } | |
da99f056 | 1255 | EXPORT_SYMBOL(iucv_message_reject); |
2356f4cb MS |
1256 | |
1257 | /** | |
1258 | * iucv_message_reply | |
1259 | * @path: address of iucv path structure | |
1260 | * @msg: address of iucv msg structure | |
1261 | * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1262 | * @reply: address of reply data buffer or address of struct iucv_array | |
1263 | * @size: length of reply data buffer | |
1264 | * | |
1265 | * This function responds to the two-way messages that you receive. You | |
1266 | * must identify completely the message to which you wish to reply. ie, | |
1267 | * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into | |
1268 | * the parameter list. | |
1269 | * | |
1270 | * Returns the result from the CP IUCV call. | |
1271 | */ | |
1272 | int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, | |
1273 | u8 flags, void *reply, size_t size) | |
1274 | { | |
1275 | union iucv_param *parm; | |
1276 | int rc; | |
1277 | ||
1278 | local_bh_disable(); | |
f2019030 | 1279 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1280 | rc = -EIO; |
1281 | goto out; | |
1282 | } | |
70cf5035 | 1283 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1284 | memset(parm, 0, sizeof(union iucv_param)); |
1285 | if (flags & IUCV_IPRMDATA) { | |
1286 | parm->dpl.ippathid = path->pathid; | |
1287 | parm->dpl.ipflags1 = flags; | |
1288 | parm->dpl.ipmsgid = msg->id; | |
1289 | parm->dpl.iptrgcls = msg->class; | |
1290 | memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); | |
1291 | } else { | |
1292 | parm->db.ipbfadr1 = (u32)(addr_t) reply; | |
1293 | parm->db.ipbfln1f = (u32) size; | |
1294 | parm->db.ippathid = path->pathid; | |
1295 | parm->db.ipflags1 = flags; | |
1296 | parm->db.ipmsgid = msg->id; | |
1297 | parm->db.iptrgcls = msg->class; | |
1298 | } | |
1299 | rc = iucv_call_b2f0(IUCV_REPLY, parm); | |
6c005961 | 1300 | out: |
2356f4cb MS |
1301 | local_bh_enable(); |
1302 | return rc; | |
1303 | } | |
da99f056 | 1304 | EXPORT_SYMBOL(iucv_message_reply); |
2356f4cb MS |
1305 | |
1306 | /** | |
91d5d45e | 1307 | * __iucv_message_send |
2356f4cb MS |
1308 | * @path: address of iucv path structure |
1309 | * @msg: address of iucv msg structure | |
1310 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1311 | * @srccls: source class of message | |
1312 | * @buffer: address of send buffer or address of struct iucv_array | |
1313 | * @size: length of send buffer | |
1314 | * | |
1315 | * This function transmits data to another application. Data to be | |
1316 | * transmitted is in a buffer and this is a one-way message and the | |
1317 | * receiver will not reply to the message. | |
1318 | * | |
91d5d45e HB |
1319 | * Locking: no locking |
1320 | * | |
2356f4cb MS |
1321 | * Returns the result from the CP IUCV call. |
1322 | */ | |
91d5d45e | 1323 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
2356f4cb MS |
1324 | u8 flags, u32 srccls, void *buffer, size_t size) |
1325 | { | |
1326 | union iucv_param *parm; | |
1327 | int rc; | |
1328 | ||
f2019030 | 1329 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1330 | rc = -EIO; |
1331 | goto out; | |
1332 | } | |
70cf5035 | 1333 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1334 | memset(parm, 0, sizeof(union iucv_param)); |
1335 | if (flags & IUCV_IPRMDATA) { | |
1336 | /* Message of 8 bytes can be placed into the parameter list. */ | |
1337 | parm->dpl.ippathid = path->pathid; | |
1338 | parm->dpl.ipflags1 = flags | IUCV_IPNORPY; | |
1339 | parm->dpl.iptrgcls = msg->class; | |
1340 | parm->dpl.ipsrccls = srccls; | |
1341 | parm->dpl.ipmsgtag = msg->tag; | |
1342 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1343 | } else { | |
1344 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1345 | parm->db.ipbfln1f = (u32) size; | |
1346 | parm->db.ippathid = path->pathid; | |
1347 | parm->db.ipflags1 = flags | IUCV_IPNORPY; | |
1348 | parm->db.iptrgcls = msg->class; | |
1349 | parm->db.ipsrccls = srccls; | |
1350 | parm->db.ipmsgtag = msg->tag; | |
1351 | } | |
1352 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1353 | if (!rc) | |
1354 | msg->id = parm->db.ipmsgid; | |
6c005961 | 1355 | out: |
91d5d45e HB |
1356 | return rc; |
1357 | } | |
1358 | EXPORT_SYMBOL(__iucv_message_send); | |
1359 | ||
1360 | /** | |
1361 | * iucv_message_send | |
1362 | * @path: address of iucv path structure | |
1363 | * @msg: address of iucv msg structure | |
1364 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1365 | * @srccls: source class of message | |
1366 | * @buffer: address of send buffer or address of struct iucv_array | |
1367 | * @size: length of send buffer | |
1368 | * | |
1369 | * This function transmits data to another application. Data to be | |
1370 | * transmitted is in a buffer and this is a one-way message and the | |
1371 | * receiver will not reply to the message. | |
1372 | * | |
1373 | * Locking: local_bh_enable/local_bh_disable | |
1374 | * | |
1375 | * Returns the result from the CP IUCV call. | |
1376 | */ | |
1377 | int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, | |
1378 | u8 flags, u32 srccls, void *buffer, size_t size) | |
1379 | { | |
1380 | int rc; | |
1381 | ||
1382 | local_bh_disable(); | |
1383 | rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); | |
2356f4cb MS |
1384 | local_bh_enable(); |
1385 | return rc; | |
1386 | } | |
da99f056 | 1387 | EXPORT_SYMBOL(iucv_message_send); |
2356f4cb MS |
1388 | |
1389 | /** | |
1390 | * iucv_message_send2way | |
1391 | * @path: address of iucv path structure | |
1392 | * @msg: address of iucv msg structure | |
1393 | * @flags: how the message is sent and the reply is received | |
1394 | * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) | |
1395 | * @srccls: source class of message | |
1396 | * @buffer: address of send buffer or address of struct iucv_array | |
1397 | * @size: length of send buffer | |
1398 | * @ansbuf: address of answer buffer or address of struct iucv_array | |
1399 | * @asize: size of reply buffer | |
1400 | * | |
1401 | * This function transmits data to another application. Data to be | |
1402 | * transmitted is in a buffer. The receiver of the send is expected to | |
1403 | * reply to the message and a buffer is provided into which IUCV moves | |
1404 | * the reply to this message. | |
1405 | * | |
1406 | * Returns the result from the CP IUCV call. | |
1407 | */ | |
1408 | int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, | |
1409 | u8 flags, u32 srccls, void *buffer, size_t size, | |
1410 | void *answer, size_t asize, size_t *residual) | |
1411 | { | |
1412 | union iucv_param *parm; | |
1413 | int rc; | |
1414 | ||
1415 | local_bh_disable(); | |
f2019030 | 1416 | if (cpumask_empty(&iucv_buffer_cpumask)) { |
6c005961 UB |
1417 | rc = -EIO; |
1418 | goto out; | |
1419 | } | |
70cf5035 | 1420 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1421 | memset(parm, 0, sizeof(union iucv_param)); |
1422 | if (flags & IUCV_IPRMDATA) { | |
1423 | parm->dpl.ippathid = path->pathid; | |
1424 | parm->dpl.ipflags1 = path->flags; /* priority message */ | |
1425 | parm->dpl.iptrgcls = msg->class; | |
1426 | parm->dpl.ipsrccls = srccls; | |
1427 | parm->dpl.ipmsgtag = msg->tag; | |
1428 | parm->dpl.ipbfadr2 = (u32)(addr_t) answer; | |
1429 | parm->dpl.ipbfln2f = (u32) asize; | |
1430 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1431 | } else { | |
1432 | parm->db.ippathid = path->pathid; | |
1433 | parm->db.ipflags1 = path->flags; /* priority message */ | |
1434 | parm->db.iptrgcls = msg->class; | |
1435 | parm->db.ipsrccls = srccls; | |
1436 | parm->db.ipmsgtag = msg->tag; | |
1437 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1438 | parm->db.ipbfln1f = (u32) size; | |
1439 | parm->db.ipbfadr2 = (u32)(addr_t) answer; | |
1440 | parm->db.ipbfln2f = (u32) asize; | |
1441 | } | |
1442 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1443 | if (!rc) | |
1444 | msg->id = parm->db.ipmsgid; | |
6c005961 | 1445 | out: |
2356f4cb MS |
1446 | local_bh_enable(); |
1447 | return rc; | |
1448 | } | |
da99f056 | 1449 | EXPORT_SYMBOL(iucv_message_send2way); |
2356f4cb MS |
1450 | |
1451 | /** | |
1452 | * iucv_path_pending | |
1453 | * @data: Pointer to external interrupt buffer | |
1454 | * | |
1455 | * Process connection pending work item. Called from tasklet while holding | |
1456 | * iucv_table_lock. | |
1457 | */ | |
1458 | struct iucv_path_pending { | |
1459 | u16 ippathid; | |
1460 | u8 ipflags1; | |
1461 | u8 iptype; | |
1462 | u16 ipmsglim; | |
1463 | u16 res1; | |
1464 | u8 ipvmid[8]; | |
1465 | u8 ipuser[16]; | |
1466 | u32 res3; | |
1467 | u8 ippollfg; | |
1468 | u8 res4[3]; | |
bc10502d | 1469 | } __packed; |
2356f4cb MS |
1470 | |
1471 | static void iucv_path_pending(struct iucv_irq_data *data) | |
1472 | { | |
1473 | struct iucv_path_pending *ipp = (void *) data; | |
1474 | struct iucv_handler *handler; | |
1475 | struct iucv_path *path; | |
1476 | char *error; | |
1477 | ||
1478 | BUG_ON(iucv_path_table[ipp->ippathid]); | |
1479 | /* New pathid, handler found. Create a new path struct. */ | |
1480 | error = iucv_error_no_memory; | |
1481 | path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); | |
1482 | if (!path) | |
1483 | goto out_sever; | |
1484 | path->pathid = ipp->ippathid; | |
1485 | iucv_path_table[path->pathid] = path; | |
1486 | EBCASC(ipp->ipvmid, 8); | |
1487 | ||
1488 | /* Call registered handler until one is found that wants the path. */ | |
1489 | list_for_each_entry(handler, &iucv_handler_list, list) { | |
1490 | if (!handler->path_pending) | |
1491 | continue; | |
1492 | /* | |
1493 | * Add path to handler to allow a call to iucv_path_sever | |
1494 | * inside the path_pending function. If the handler returns | |
1495 | * an error remove the path from the handler again. | |
1496 | */ | |
1497 | list_add(&path->list, &handler->paths); | |
1498 | path->handler = handler; | |
1499 | if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) | |
1500 | return; | |
1501 | list_del(&path->list); | |
1502 | path->handler = NULL; | |
1503 | } | |
1504 | /* No handler wanted the path. */ | |
1505 | iucv_path_table[path->pathid] = NULL; | |
1506 | iucv_path_free(path); | |
1507 | error = iucv_error_no_listener; | |
1508 | out_sever: | |
1509 | iucv_sever_pathid(ipp->ippathid, error); | |
1510 | } | |
1511 | ||
1512 | /** | |
1513 | * iucv_path_complete | |
1514 | * @data: Pointer to external interrupt buffer | |
1515 | * | |
1516 | * Process connection complete work item. Called from tasklet while holding | |
1517 | * iucv_table_lock. | |
1518 | */ | |
1519 | struct iucv_path_complete { | |
1520 | u16 ippathid; | |
1521 | u8 ipflags1; | |
1522 | u8 iptype; | |
1523 | u16 ipmsglim; | |
1524 | u16 res1; | |
1525 | u8 res2[8]; | |
1526 | u8 ipuser[16]; | |
1527 | u32 res3; | |
1528 | u8 ippollfg; | |
1529 | u8 res4[3]; | |
bc10502d | 1530 | } __packed; |
2356f4cb MS |
1531 | |
1532 | static void iucv_path_complete(struct iucv_irq_data *data) | |
1533 | { | |
1534 | struct iucv_path_complete *ipc = (void *) data; | |
1535 | struct iucv_path *path = iucv_path_table[ipc->ippathid]; | |
1536 | ||
b8942e3b HB |
1537 | if (path) |
1538 | path->flags = ipc->ipflags1; | |
04b090d5 | 1539 | if (path && path->handler && path->handler->path_complete) |
2356f4cb MS |
1540 | path->handler->path_complete(path, ipc->ipuser); |
1541 | } | |
1542 | ||
1543 | /** | |
1544 | * iucv_path_severed | |
1545 | * @data: Pointer to external interrupt buffer | |
1546 | * | |
1547 | * Process connection severed work item. Called from tasklet while holding | |
1548 | * iucv_table_lock. | |
1549 | */ | |
1550 | struct iucv_path_severed { | |
1551 | u16 ippathid; | |
1552 | u8 res1; | |
1553 | u8 iptype; | |
1554 | u32 res2; | |
1555 | u8 res3[8]; | |
1556 | u8 ipuser[16]; | |
1557 | u32 res4; | |
1558 | u8 ippollfg; | |
1559 | u8 res5[3]; | |
bc10502d | 1560 | } __packed; |
2356f4cb MS |
1561 | |
1562 | static void iucv_path_severed(struct iucv_irq_data *data) | |
1563 | { | |
1564 | struct iucv_path_severed *ips = (void *) data; | |
1565 | struct iucv_path *path = iucv_path_table[ips->ippathid]; | |
1566 | ||
04b090d5 MS |
1567 | if (!path || !path->handler) /* Already severed */ |
1568 | return; | |
2356f4cb MS |
1569 | if (path->handler->path_severed) |
1570 | path->handler->path_severed(path, ips->ipuser); | |
1571 | else { | |
1572 | iucv_sever_pathid(path->pathid, NULL); | |
1573 | iucv_path_table[path->pathid] = NULL; | |
42e1b4c2 | 1574 | list_del(&path->list); |
2356f4cb MS |
1575 | iucv_path_free(path); |
1576 | } | |
1577 | } | |
1578 | ||
1579 | /** | |
1580 | * iucv_path_quiesced | |
1581 | * @data: Pointer to external interrupt buffer | |
1582 | * | |
1583 | * Process connection quiesced work item. Called from tasklet while holding | |
1584 | * iucv_table_lock. | |
1585 | */ | |
1586 | struct iucv_path_quiesced { | |
1587 | u16 ippathid; | |
1588 | u8 res1; | |
1589 | u8 iptype; | |
1590 | u32 res2; | |
1591 | u8 res3[8]; | |
1592 | u8 ipuser[16]; | |
1593 | u32 res4; | |
1594 | u8 ippollfg; | |
1595 | u8 res5[3]; | |
bc10502d | 1596 | } __packed; |
2356f4cb MS |
1597 | |
1598 | static void iucv_path_quiesced(struct iucv_irq_data *data) | |
1599 | { | |
1600 | struct iucv_path_quiesced *ipq = (void *) data; | |
1601 | struct iucv_path *path = iucv_path_table[ipq->ippathid]; | |
1602 | ||
04b090d5 | 1603 | if (path && path->handler && path->handler->path_quiesced) |
2356f4cb MS |
1604 | path->handler->path_quiesced(path, ipq->ipuser); |
1605 | } | |
1606 | ||
1607 | /** | |
1608 | * iucv_path_resumed | |
1609 | * @data: Pointer to external interrupt buffer | |
1610 | * | |
1611 | * Process connection resumed work item. Called from tasklet while holding | |
1612 | * iucv_table_lock. | |
1613 | */ | |
1614 | struct iucv_path_resumed { | |
1615 | u16 ippathid; | |
1616 | u8 res1; | |
1617 | u8 iptype; | |
1618 | u32 res2; | |
1619 | u8 res3[8]; | |
1620 | u8 ipuser[16]; | |
1621 | u32 res4; | |
1622 | u8 ippollfg; | |
1623 | u8 res5[3]; | |
bc10502d | 1624 | } __packed; |
2356f4cb MS |
1625 | |
1626 | static void iucv_path_resumed(struct iucv_irq_data *data) | |
1627 | { | |
1628 | struct iucv_path_resumed *ipr = (void *) data; | |
1629 | struct iucv_path *path = iucv_path_table[ipr->ippathid]; | |
1630 | ||
04b090d5 | 1631 | if (path && path->handler && path->handler->path_resumed) |
2356f4cb MS |
1632 | path->handler->path_resumed(path, ipr->ipuser); |
1633 | } | |
1634 | ||
1635 | /** | |
1636 | * iucv_message_complete | |
1637 | * @data: Pointer to external interrupt buffer | |
1638 | * | |
1639 | * Process message complete work item. Called from tasklet while holding | |
1640 | * iucv_table_lock. | |
1641 | */ | |
1642 | struct iucv_message_complete { | |
1643 | u16 ippathid; | |
1644 | u8 ipflags1; | |
1645 | u8 iptype; | |
1646 | u32 ipmsgid; | |
1647 | u32 ipaudit; | |
1648 | u8 iprmmsg[8]; | |
1649 | u32 ipsrccls; | |
1650 | u32 ipmsgtag; | |
1651 | u32 res; | |
1652 | u32 ipbfln2f; | |
1653 | u8 ippollfg; | |
1654 | u8 res2[3]; | |
bc10502d | 1655 | } __packed; |
2356f4cb MS |
1656 | |
1657 | static void iucv_message_complete(struct iucv_irq_data *data) | |
1658 | { | |
1659 | struct iucv_message_complete *imc = (void *) data; | |
1660 | struct iucv_path *path = iucv_path_table[imc->ippathid]; | |
1661 | struct iucv_message msg; | |
1662 | ||
04b090d5 | 1663 | if (path && path->handler && path->handler->message_complete) { |
2356f4cb MS |
1664 | msg.flags = imc->ipflags1; |
1665 | msg.id = imc->ipmsgid; | |
1666 | msg.audit = imc->ipaudit; | |
1667 | memcpy(msg.rmmsg, imc->iprmmsg, 8); | |
1668 | msg.class = imc->ipsrccls; | |
1669 | msg.tag = imc->ipmsgtag; | |
1670 | msg.length = imc->ipbfln2f; | |
1671 | path->handler->message_complete(path, &msg); | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | /** | |
1676 | * iucv_message_pending | |
1677 | * @data: Pointer to external interrupt buffer | |
1678 | * | |
1679 | * Process message pending work item. Called from tasklet while holding | |
1680 | * iucv_table_lock. | |
1681 | */ | |
1682 | struct iucv_message_pending { | |
1683 | u16 ippathid; | |
1684 | u8 ipflags1; | |
1685 | u8 iptype; | |
1686 | u32 ipmsgid; | |
1687 | u32 iptrgcls; | |
1688 | union { | |
1689 | u32 iprmmsg1_u32; | |
1690 | u8 iprmmsg1[4]; | |
1691 | } ln1msg1; | |
1692 | union { | |
1693 | u32 ipbfln1f; | |
1694 | u8 iprmmsg2[4]; | |
1695 | } ln1msg2; | |
1696 | u32 res1[3]; | |
1697 | u32 ipbfln2f; | |
1698 | u8 ippollfg; | |
1699 | u8 res2[3]; | |
bc10502d | 1700 | } __packed; |
2356f4cb MS |
1701 | |
1702 | static void iucv_message_pending(struct iucv_irq_data *data) | |
1703 | { | |
1704 | struct iucv_message_pending *imp = (void *) data; | |
1705 | struct iucv_path *path = iucv_path_table[imp->ippathid]; | |
1706 | struct iucv_message msg; | |
1707 | ||
04b090d5 | 1708 | if (path && path->handler && path->handler->message_pending) { |
2356f4cb MS |
1709 | msg.flags = imp->ipflags1; |
1710 | msg.id = imp->ipmsgid; | |
1711 | msg.class = imp->iptrgcls; | |
1712 | if (imp->ipflags1 & IUCV_IPRMDATA) { | |
1713 | memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8); | |
1714 | msg.length = 8; | |
1715 | } else | |
1716 | msg.length = imp->ln1msg2.ipbfln1f; | |
1717 | msg.reply_size = imp->ipbfln2f; | |
1718 | path->handler->message_pending(path, &msg); | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | /** | |
04b090d5 | 1723 | * iucv_tasklet_fn: |
2356f4cb MS |
1724 | * |
1725 | * This tasklet loops over the queue of irq buffers created by | |
1726 | * iucv_external_interrupt, calls the appropriate action handler | |
1727 | * and then frees the buffer. | |
1728 | */ | |
04b090d5 | 1729 | static void iucv_tasklet_fn(unsigned long ignored) |
2356f4cb MS |
1730 | { |
1731 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
1732 | static iucv_irq_fn *irq_fn[] = { | |
2356f4cb MS |
1733 | [0x02] = iucv_path_complete, |
1734 | [0x03] = iucv_path_severed, | |
1735 | [0x04] = iucv_path_quiesced, | |
1736 | [0x05] = iucv_path_resumed, | |
1737 | [0x06] = iucv_message_complete, | |
1738 | [0x07] = iucv_message_complete, | |
1739 | [0x08] = iucv_message_pending, | |
1740 | [0x09] = iucv_message_pending, | |
1741 | }; | |
b5e78337 | 1742 | LIST_HEAD(task_queue); |
04b090d5 | 1743 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
1744 | |
1745 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
13fdc9a7 UB |
1746 | if (!spin_trylock(&iucv_table_lock)) { |
1747 | tasklet_schedule(&iucv_tasklet); | |
1748 | return; | |
1749 | } | |
04b090d5 | 1750 | iucv_active_cpu = smp_processor_id(); |
2356f4cb | 1751 | |
04b090d5 MS |
1752 | spin_lock_irq(&iucv_queue_lock); |
1753 | list_splice_init(&iucv_task_queue, &task_queue); | |
1754 | spin_unlock_irq(&iucv_queue_lock); | |
1755 | ||
1756 | list_for_each_entry_safe(p, n, &task_queue, list) { | |
2356f4cb | 1757 | list_del_init(&p->list); |
2356f4cb MS |
1758 | irq_fn[p->data.iptype](&p->data); |
1759 | kfree(p); | |
2356f4cb | 1760 | } |
2356f4cb | 1761 | |
04b090d5 | 1762 | iucv_active_cpu = -1; |
2356f4cb MS |
1763 | spin_unlock(&iucv_table_lock); |
1764 | } | |
1765 | ||
04b090d5 MS |
1766 | /** |
1767 | * iucv_work_fn: | |
1768 | * | |
1769 | * This work function loops over the queue of path pending irq blocks | |
1770 | * created by iucv_external_interrupt, calls the appropriate action | |
1771 | * handler and then frees the buffer. | |
1772 | */ | |
1773 | static void iucv_work_fn(struct work_struct *work) | |
1774 | { | |
b5e78337 | 1775 | LIST_HEAD(work_queue); |
04b090d5 MS |
1776 | struct iucv_irq_list *p, *n; |
1777 | ||
1778 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
1779 | spin_lock_bh(&iucv_table_lock); | |
1780 | iucv_active_cpu = smp_processor_id(); | |
1781 | ||
1782 | spin_lock_irq(&iucv_queue_lock); | |
1783 | list_splice_init(&iucv_work_queue, &work_queue); | |
1784 | spin_unlock_irq(&iucv_queue_lock); | |
1785 | ||
1786 | iucv_cleanup_queue(); | |
1787 | list_for_each_entry_safe(p, n, &work_queue, list) { | |
1788 | list_del_init(&p->list); | |
1789 | iucv_path_pending(&p->data); | |
1790 | kfree(p); | |
1791 | } | |
1792 | ||
1793 | iucv_active_cpu = -1; | |
1794 | spin_unlock_bh(&iucv_table_lock); | |
1795 | } | |
1796 | ||
2356f4cb MS |
1797 | /** |
1798 | * iucv_external_interrupt | |
1799 | * @code: irq code | |
1800 | * | |
1801 | * Handles external interrupts coming in from CP. | |
04b090d5 | 1802 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
2356f4cb | 1803 | */ |
fde15c3a | 1804 | static void iucv_external_interrupt(struct ext_code ext_code, |
f6649a7e | 1805 | unsigned int param32, unsigned long param64) |
2356f4cb MS |
1806 | { |
1807 | struct iucv_irq_data *p; | |
04b090d5 | 1808 | struct iucv_irq_list *work; |
2356f4cb | 1809 | |
420f42ec | 1810 | inc_irq_stat(IRQEXT_IUC); |
70cf5035 | 1811 | p = iucv_irq_data[smp_processor_id()]; |
2356f4cb | 1812 | if (p->ippathid >= iucv_max_pathid) { |
c2b4afd2 | 1813 | WARN_ON(p->ippathid >= iucv_max_pathid); |
2356f4cb MS |
1814 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
1815 | return; | |
1816 | } | |
c2b4afd2 | 1817 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
04b090d5 | 1818 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
2356f4cb | 1819 | if (!work) { |
47c4cfc3 | 1820 | pr_warn("iucv_external_interrupt: out of memory\n"); |
2356f4cb MS |
1821 | return; |
1822 | } | |
1823 | memcpy(&work->data, p, sizeof(work->data)); | |
04b090d5 MS |
1824 | spin_lock(&iucv_queue_lock); |
1825 | if (p->iptype == 0x01) { | |
1826 | /* Path pending interrupt. */ | |
1827 | list_add_tail(&work->list, &iucv_work_queue); | |
1828 | schedule_work(&iucv_work); | |
1829 | } else { | |
1830 | /* The other interrupts. */ | |
1831 | list_add_tail(&work->list, &iucv_task_queue); | |
1832 | tasklet_schedule(&iucv_tasklet); | |
1833 | } | |
1834 | spin_unlock(&iucv_queue_lock); | |
2356f4cb MS |
1835 | } |
1836 | ||
672e405b UB |
1837 | static int iucv_pm_prepare(struct device *dev) |
1838 | { | |
1839 | int rc = 0; | |
1840 | ||
1841 | #ifdef CONFIG_PM_DEBUG | |
1842 | printk(KERN_INFO "iucv_pm_prepare\n"); | |
1843 | #endif | |
1844 | if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) | |
1845 | rc = dev->driver->pm->prepare(dev); | |
1846 | return rc; | |
1847 | } | |
1848 | ||
1849 | static void iucv_pm_complete(struct device *dev) | |
1850 | { | |
1851 | #ifdef CONFIG_PM_DEBUG | |
1852 | printk(KERN_INFO "iucv_pm_complete\n"); | |
1853 | #endif | |
1854 | if (dev->driver && dev->driver->pm && dev->driver->pm->complete) | |
1855 | dev->driver->pm->complete(dev); | |
1856 | } | |
1857 | ||
1858 | /** | |
1859 | * iucv_path_table_empty() - determine if iucv path table is empty | |
1860 | * | |
1861 | * Returns 0 if there are still iucv pathes defined | |
1862 | * 1 if there are no iucv pathes defined | |
1863 | */ | |
b7f41565 | 1864 | static int iucv_path_table_empty(void) |
672e405b UB |
1865 | { |
1866 | int i; | |
1867 | ||
1868 | for (i = 0; i < iucv_max_pathid; i++) { | |
1869 | if (iucv_path_table[i]) | |
1870 | return 0; | |
1871 | } | |
1872 | return 1; | |
1873 | } | |
1874 | ||
1875 | /** | |
1876 | * iucv_pm_freeze() - Freeze PM callback | |
1877 | * @dev: iucv-based device | |
1878 | * | |
1879 | * disable iucv interrupts | |
1880 | * invoke callback function of the iucv-based driver | |
1881 | * shut down iucv, if no iucv-pathes are established anymore | |
1882 | */ | |
1883 | static int iucv_pm_freeze(struct device *dev) | |
1884 | { | |
1885 | int cpu; | |
b7c2aecc | 1886 | struct iucv_irq_list *p, *n; |
672e405b UB |
1887 | int rc = 0; |
1888 | ||
1889 | #ifdef CONFIG_PM_DEBUG | |
1890 | printk(KERN_WARNING "iucv_pm_freeze\n"); | |
1891 | #endif | |
b7c2aecc | 1892 | if (iucv_pm_state != IUCV_PM_FREEZING) { |
f2019030 | 1893 | for_each_cpu(cpu, &iucv_irq_cpumask) |
b7c2aecc UB |
1894 | smp_call_function_single(cpu, iucv_block_cpu_almost, |
1895 | NULL, 1); | |
1896 | cancel_work_sync(&iucv_work); | |
1897 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) { | |
1898 | list_del_init(&p->list); | |
1899 | iucv_sever_pathid(p->data.ippathid, | |
1900 | iucv_error_no_listener); | |
1901 | kfree(p); | |
1902 | } | |
1903 | } | |
4c89d86b | 1904 | iucv_pm_state = IUCV_PM_FREEZING; |
672e405b UB |
1905 | if (dev->driver && dev->driver->pm && dev->driver->pm->freeze) |
1906 | rc = dev->driver->pm->freeze(dev); | |
1907 | if (iucv_path_table_empty()) | |
1908 | iucv_disable(); | |
1909 | return rc; | |
1910 | } | |
1911 | ||
1912 | /** | |
1913 | * iucv_pm_thaw() - Thaw PM callback | |
1914 | * @dev: iucv-based device | |
1915 | * | |
1916 | * make iucv ready for use again: allocate path table, declare interrupt buffers | |
1917 | * and enable iucv interrupts | |
1918 | * invoke callback function of the iucv-based driver | |
1919 | */ | |
1920 | static int iucv_pm_thaw(struct device *dev) | |
1921 | { | |
1922 | int rc = 0; | |
1923 | ||
1924 | #ifdef CONFIG_PM_DEBUG | |
1925 | printk(KERN_WARNING "iucv_pm_thaw\n"); | |
1926 | #endif | |
4c89d86b | 1927 | iucv_pm_state = IUCV_PM_THAWING; |
672e405b UB |
1928 | if (!iucv_path_table) { |
1929 | rc = iucv_enable(); | |
1930 | if (rc) | |
1931 | goto out; | |
1932 | } | |
f2019030 | 1933 | if (cpumask_empty(&iucv_irq_cpumask)) { |
672e405b UB |
1934 | if (iucv_nonsmp_handler) |
1935 | /* enable interrupts on one cpu */ | |
1936 | iucv_allow_cpu(NULL); | |
1937 | else | |
1938 | /* enable interrupts on all cpus */ | |
1939 | iucv_setmask_mp(); | |
1940 | } | |
1941 | if (dev->driver && dev->driver->pm && dev->driver->pm->thaw) | |
1942 | rc = dev->driver->pm->thaw(dev); | |
1943 | out: | |
1944 | return rc; | |
1945 | } | |
1946 | ||
1947 | /** | |
1948 | * iucv_pm_restore() - Restore PM callback | |
1949 | * @dev: iucv-based device | |
1950 | * | |
1951 | * make iucv ready for use again: allocate path table, declare interrupt buffers | |
1952 | * and enable iucv interrupts | |
1953 | * invoke callback function of the iucv-based driver | |
1954 | */ | |
1955 | static int iucv_pm_restore(struct device *dev) | |
1956 | { | |
1957 | int rc = 0; | |
1958 | ||
1959 | #ifdef CONFIG_PM_DEBUG | |
1960 | printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table); | |
1961 | #endif | |
4c89d86b | 1962 | if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table) |
47c4cfc3 | 1963 | pr_warn("Suspending Linux did not completely close all IUCV connections\n"); |
4c89d86b | 1964 | iucv_pm_state = IUCV_PM_RESTORING; |
f2019030 | 1965 | if (cpumask_empty(&iucv_irq_cpumask)) { |
672e405b UB |
1966 | rc = iucv_query_maxconn(); |
1967 | rc = iucv_enable(); | |
1968 | if (rc) | |
1969 | goto out; | |
1970 | } | |
1971 | if (dev->driver && dev->driver->pm && dev->driver->pm->restore) | |
1972 | rc = dev->driver->pm->restore(dev); | |
1973 | out: | |
1974 | return rc; | |
1975 | } | |
1976 | ||
96d042a6 FB |
1977 | struct iucv_interface iucv_if = { |
1978 | .message_receive = iucv_message_receive, | |
1979 | .__message_receive = __iucv_message_receive, | |
1980 | .message_reply = iucv_message_reply, | |
1981 | .message_reject = iucv_message_reject, | |
1982 | .message_send = iucv_message_send, | |
1983 | .__message_send = __iucv_message_send, | |
1984 | .message_send2way = iucv_message_send2way, | |
1985 | .message_purge = iucv_message_purge, | |
1986 | .path_accept = iucv_path_accept, | |
1987 | .path_connect = iucv_path_connect, | |
1988 | .path_quiesce = iucv_path_quiesce, | |
1989 | .path_resume = iucv_path_resume, | |
1990 | .path_sever = iucv_path_sever, | |
1991 | .iucv_register = iucv_register, | |
1992 | .iucv_unregister = iucv_unregister, | |
1993 | .bus = NULL, | |
1994 | .root = NULL, | |
1995 | }; | |
1996 | EXPORT_SYMBOL(iucv_if); | |
1997 | ||
38b48292 | 1998 | static enum cpuhp_state iucv_online; |
2356f4cb MS |
1999 | /** |
2000 | * iucv_init | |
2001 | * | |
2002 | * Allocates and initializes various data structures. | |
2003 | */ | |
da99f056 | 2004 | static int __init iucv_init(void) |
2356f4cb MS |
2005 | { |
2006 | int rc; | |
2007 | ||
2008 | if (!MACHINE_IS_VM) { | |
2009 | rc = -EPROTONOSUPPORT; | |
2010 | goto out; | |
2011 | } | |
5beab991 | 2012 | ctl_set_bit(0, 1); |
2356f4cb MS |
2013 | rc = iucv_query_maxconn(); |
2014 | if (rc) | |
5beab991 | 2015 | goto out_ctl; |
1dad093b | 2016 | rc = register_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); |
2356f4cb | 2017 | if (rc) |
5beab991 | 2018 | goto out_ctl; |
035da16f | 2019 | iucv_root = root_device_register("iucv"); |
2356f4cb MS |
2020 | if (IS_ERR(iucv_root)) { |
2021 | rc = PTR_ERR(iucv_root); | |
2d7bf367 | 2022 | goto out_int; |
2356f4cb | 2023 | } |
70cf5035 | 2024 | |
38b48292 SAS |
2025 | rc = cpuhp_setup_state(CPUHP_NET_IUCV_PREPARE, "net/iucv:prepare", |
2026 | iucv_cpu_prepare, iucv_cpu_dead); | |
2d7bf367 | 2027 | if (rc) |
9c6bafab | 2028 | goto out_dev; |
38b48292 SAS |
2029 | rc = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "net/iucv:online", |
2030 | iucv_cpu_online, iucv_cpu_down_prep); | |
2031 | if (rc < 0) | |
9c6bafab | 2032 | goto out_prep; |
38b48292 | 2033 | iucv_online = rc; |
a0e247a8 | 2034 | |
6c005961 UB |
2035 | rc = register_reboot_notifier(&iucv_reboot_notifier); |
2036 | if (rc) | |
9c6bafab | 2037 | goto out_remove_hp; |
2356f4cb MS |
2038 | ASCEBC(iucv_error_no_listener, 16); |
2039 | ASCEBC(iucv_error_no_memory, 16); | |
2040 | ASCEBC(iucv_error_pathid, 16); | |
2041 | iucv_available = 1; | |
2d7bf367 CH |
2042 | rc = bus_register(&iucv_bus); |
2043 | if (rc) | |
6c005961 | 2044 | goto out_reboot; |
96d042a6 FB |
2045 | iucv_if.root = iucv_root; |
2046 | iucv_if.bus = &iucv_bus; | |
2356f4cb MS |
2047 | return 0; |
2048 | ||
6c005961 UB |
2049 | out_reboot: |
2050 | unregister_reboot_notifier(&iucv_reboot_notifier); | |
9c6bafab SAS |
2051 | out_remove_hp: |
2052 | cpuhp_remove_state(iucv_online); | |
2053 | out_prep: | |
38b48292 | 2054 | cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); |
9c6bafab | 2055 | out_dev: |
035da16f | 2056 | root_device_unregister(iucv_root); |
2356f4cb | 2057 | out_int: |
1dad093b | 2058 | unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); |
5beab991 MS |
2059 | out_ctl: |
2060 | ctl_clear_bit(0, 1); | |
2356f4cb MS |
2061 | out: |
2062 | return rc; | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * iucv_exit | |
2067 | * | |
2068 | * Frees everything allocated from iucv_init. | |
2069 | */ | |
da99f056 | 2070 | static void __exit iucv_exit(void) |
2356f4cb | 2071 | { |
04b090d5 | 2072 | struct iucv_irq_list *p, *n; |
2356f4cb | 2073 | |
04b090d5 MS |
2074 | spin_lock_irq(&iucv_queue_lock); |
2075 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) | |
2076 | kfree(p); | |
2356f4cb MS |
2077 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
2078 | kfree(p); | |
04b090d5 | 2079 | spin_unlock_irq(&iucv_queue_lock); |
6c005961 | 2080 | unregister_reboot_notifier(&iucv_reboot_notifier); |
38b48292 SAS |
2081 | |
2082 | cpuhp_remove_state_nocalls(iucv_online); | |
2083 | cpuhp_remove_state(CPUHP_NET_IUCV_PREPARE); | |
035da16f | 2084 | root_device_unregister(iucv_root); |
2356f4cb | 2085 | bus_unregister(&iucv_bus); |
1dad093b | 2086 | unregister_external_irq(EXT_IRQ_IUCV, iucv_external_interrupt); |
2356f4cb MS |
2087 | } |
2088 | ||
2089 | subsys_initcall(iucv_init); | |
2090 | module_exit(iucv_exit); | |
2091 | ||
2356f4cb MS |
2092 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
2093 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); | |
2094 | MODULE_LICENSE("GPL"); |