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2356f4cb MS |
1 | /* |
2 | * IUCV base infrastructure. | |
3 | * | |
6c005961 UB |
4 | * Copyright IBM Corp. 2001, 2009 |
5 | * | |
2356f4cb MS |
6 | * Author(s): |
7 | * Original source: | |
8 | * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000 | |
9 | * Xenia Tkatschow (xenia@us.ibm.com) | |
10 | * 2Gb awareness and general cleanup: | |
11 | * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) | |
12 | * Rewritten for af_iucv: | |
13 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
672e405b UB |
14 | * PM functions: |
15 | * Ursula Braun (ursula.braun@de.ibm.com) | |
2356f4cb MS |
16 | * |
17 | * Documentation used: | |
18 | * The original source | |
19 | * CP Programming Service, IBM document # SC24-5760 | |
20 | * | |
21 | * This program is free software; you can redistribute it and/or modify | |
22 | * it under the terms of the GNU General Public License as published by | |
23 | * the Free Software Foundation; either version 2, or (at your option) | |
24 | * any later version. | |
25 | * | |
26 | * This program is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29 | * GNU General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License | |
32 | * along with this program; if not, write to the Free Software | |
33 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
34 | */ | |
35 | ||
8f7c502c UB |
36 | #define KMSG_COMPONENT "iucv" |
37 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
38 | ||
2356f4cb MS |
39 | #include <linux/module.h> |
40 | #include <linux/moduleparam.h> | |
2356f4cb MS |
41 | #include <linux/spinlock.h> |
42 | #include <linux/kernel.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/init.h> | |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/list.h> | |
47 | #include <linux/errno.h> | |
48 | #include <linux/err.h> | |
49 | #include <linux/device.h> | |
50 | #include <linux/cpu.h> | |
6c005961 | 51 | #include <linux/reboot.h> |
2356f4cb MS |
52 | #include <net/iucv/iucv.h> |
53 | #include <asm/atomic.h> | |
54 | #include <asm/ebcdic.h> | |
55 | #include <asm/io.h> | |
56 | #include <asm/s390_ext.h> | |
2356f4cb MS |
57 | #include <asm/smp.h> |
58 | ||
59 | /* | |
60 | * FLAGS: | |
61 | * All flags are defined in the field IPFLAGS1 of each function | |
62 | * and can be found in CP Programming Services. | |
63 | * IPSRCCLS - Indicates you have specified a source class. | |
64 | * IPTRGCLS - Indicates you have specified a target class. | |
65 | * IPFGPID - Indicates you have specified a pathid. | |
66 | * IPFGMID - Indicates you have specified a message ID. | |
67 | * IPNORPY - Indicates a one-way message. No reply expected. | |
68 | * IPALL - Indicates that all paths are affected. | |
69 | */ | |
70 | #define IUCV_IPSRCCLS 0x01 | |
71 | #define IUCV_IPTRGCLS 0x01 | |
72 | #define IUCV_IPFGPID 0x02 | |
73 | #define IUCV_IPFGMID 0x04 | |
74 | #define IUCV_IPNORPY 0x10 | |
75 | #define IUCV_IPALL 0x80 | |
76 | ||
da99f056 | 77 | static int iucv_bus_match(struct device *dev, struct device_driver *drv) |
2356f4cb MS |
78 | { |
79 | return 0; | |
80 | } | |
81 | ||
672e405b UB |
82 | static int iucv_pm_prepare(struct device *); |
83 | static void iucv_pm_complete(struct device *); | |
84 | static int iucv_pm_freeze(struct device *); | |
85 | static int iucv_pm_thaw(struct device *); | |
86 | static int iucv_pm_restore(struct device *); | |
87 | ||
88 | static struct dev_pm_ops iucv_pm_ops = { | |
89 | .prepare = iucv_pm_prepare, | |
90 | .complete = iucv_pm_complete, | |
91 | .freeze = iucv_pm_freeze, | |
92 | .thaw = iucv_pm_thaw, | |
93 | .restore = iucv_pm_restore, | |
94 | }; | |
95 | ||
2356f4cb MS |
96 | struct bus_type iucv_bus = { |
97 | .name = "iucv", | |
98 | .match = iucv_bus_match, | |
672e405b | 99 | .pm = &iucv_pm_ops, |
2356f4cb | 100 | }; |
da99f056 | 101 | EXPORT_SYMBOL(iucv_bus); |
2356f4cb MS |
102 | |
103 | struct device *iucv_root; | |
da99f056 HC |
104 | EXPORT_SYMBOL(iucv_root); |
105 | ||
2356f4cb MS |
106 | static int iucv_available; |
107 | ||
108 | /* General IUCV interrupt structure */ | |
109 | struct iucv_irq_data { | |
110 | u16 ippathid; | |
111 | u8 ipflags1; | |
112 | u8 iptype; | |
113 | u32 res2[8]; | |
114 | }; | |
115 | ||
04b090d5 | 116 | struct iucv_irq_list { |
2356f4cb MS |
117 | struct list_head list; |
118 | struct iucv_irq_data data; | |
119 | }; | |
120 | ||
70cf5035 | 121 | static struct iucv_irq_data *iucv_irq_data[NR_CPUS]; |
2356f4cb MS |
122 | static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE; |
123 | static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE; | |
124 | ||
04b090d5 MS |
125 | /* |
126 | * Queue of interrupt buffers lock for delivery via the tasklet | |
127 | * (fast but can't call smp_call_function). | |
128 | */ | |
129 | static LIST_HEAD(iucv_task_queue); | |
130 | ||
131 | /* | |
132 | * The tasklet for fast delivery of iucv interrupts. | |
133 | */ | |
134 | static void iucv_tasklet_fn(unsigned long); | |
135 | static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0); | |
136 | ||
137 | /* | |
138 | * Queue of interrupt buffers for delivery via a work queue | |
139 | * (slower but can call smp_call_function). | |
140 | */ | |
141 | static LIST_HEAD(iucv_work_queue); | |
142 | ||
143 | /* | |
144 | * The work element to deliver path pending interrupts. | |
145 | */ | |
146 | static void iucv_work_fn(struct work_struct *work); | |
147 | static DECLARE_WORK(iucv_work, iucv_work_fn); | |
148 | ||
149 | /* | |
150 | * Spinlock protecting task and work queue. | |
151 | */ | |
152 | static DEFINE_SPINLOCK(iucv_queue_lock); | |
2356f4cb MS |
153 | |
154 | enum iucv_command_codes { | |
155 | IUCV_QUERY = 0, | |
156 | IUCV_RETRIEVE_BUFFER = 2, | |
157 | IUCV_SEND = 4, | |
158 | IUCV_RECEIVE = 5, | |
159 | IUCV_REPLY = 6, | |
160 | IUCV_REJECT = 8, | |
161 | IUCV_PURGE = 9, | |
162 | IUCV_ACCEPT = 10, | |
163 | IUCV_CONNECT = 11, | |
164 | IUCV_DECLARE_BUFFER = 12, | |
165 | IUCV_QUIESCE = 13, | |
166 | IUCV_RESUME = 14, | |
167 | IUCV_SEVER = 15, | |
168 | IUCV_SETMASK = 16, | |
672e405b | 169 | IUCV_SETCONTROLMASK = 17, |
2356f4cb MS |
170 | }; |
171 | ||
172 | /* | |
173 | * Error messages that are used with the iucv_sever function. They get | |
174 | * converted to EBCDIC. | |
175 | */ | |
176 | static char iucv_error_no_listener[16] = "NO LISTENER"; | |
177 | static char iucv_error_no_memory[16] = "NO MEMORY"; | |
178 | static char iucv_error_pathid[16] = "INVALID PATHID"; | |
179 | ||
180 | /* | |
181 | * iucv_handler_list: List of registered handlers. | |
182 | */ | |
183 | static LIST_HEAD(iucv_handler_list); | |
184 | ||
185 | /* | |
186 | * iucv_path_table: an array of iucv_path structures. | |
187 | */ | |
188 | static struct iucv_path **iucv_path_table; | |
189 | static unsigned long iucv_max_pathid; | |
190 | ||
191 | /* | |
192 | * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table | |
193 | */ | |
194 | static DEFINE_SPINLOCK(iucv_table_lock); | |
195 | ||
196 | /* | |
04b090d5 MS |
197 | * iucv_active_cpu: contains the number of the cpu executing the tasklet |
198 | * or the work handler. Needed for iucv_path_sever called from tasklet. | |
2356f4cb | 199 | */ |
04b090d5 | 200 | static int iucv_active_cpu = -1; |
2356f4cb MS |
201 | |
202 | /* | |
203 | * Mutex and wait queue for iucv_register/iucv_unregister. | |
204 | */ | |
205 | static DEFINE_MUTEX(iucv_register_mutex); | |
206 | ||
207 | /* | |
208 | * Counter for number of non-smp capable handlers. | |
209 | */ | |
210 | static int iucv_nonsmp_handler; | |
211 | ||
212 | /* | |
213 | * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect, | |
214 | * iucv_path_quiesce and iucv_path_sever. | |
215 | */ | |
216 | struct iucv_cmd_control { | |
217 | u16 ippathid; | |
218 | u8 ipflags1; | |
219 | u8 iprcode; | |
220 | u16 ipmsglim; | |
221 | u16 res1; | |
222 | u8 ipvmid[8]; | |
223 | u8 ipuser[16]; | |
224 | u8 iptarget[8]; | |
225 | } __attribute__ ((packed,aligned(8))); | |
226 | ||
227 | /* | |
228 | * Data in parameter list iucv structure. Used by iucv_message_send, | |
229 | * iucv_message_send2way and iucv_message_reply. | |
230 | */ | |
231 | struct iucv_cmd_dpl { | |
232 | u16 ippathid; | |
233 | u8 ipflags1; | |
234 | u8 iprcode; | |
235 | u32 ipmsgid; | |
236 | u32 iptrgcls; | |
237 | u8 iprmmsg[8]; | |
238 | u32 ipsrccls; | |
239 | u32 ipmsgtag; | |
240 | u32 ipbfadr2; | |
241 | u32 ipbfln2f; | |
242 | u32 res; | |
243 | } __attribute__ ((packed,aligned(8))); | |
244 | ||
245 | /* | |
246 | * Data in buffer iucv structure. Used by iucv_message_receive, | |
247 | * iucv_message_reject, iucv_message_send, iucv_message_send2way | |
248 | * and iucv_declare_cpu. | |
249 | */ | |
250 | struct iucv_cmd_db { | |
251 | u16 ippathid; | |
252 | u8 ipflags1; | |
253 | u8 iprcode; | |
254 | u32 ipmsgid; | |
255 | u32 iptrgcls; | |
256 | u32 ipbfadr1; | |
257 | u32 ipbfln1f; | |
258 | u32 ipsrccls; | |
259 | u32 ipmsgtag; | |
260 | u32 ipbfadr2; | |
261 | u32 ipbfln2f; | |
262 | u32 res; | |
263 | } __attribute__ ((packed,aligned(8))); | |
264 | ||
265 | /* | |
266 | * Purge message iucv structure. Used by iucv_message_purge. | |
267 | */ | |
268 | struct iucv_cmd_purge { | |
269 | u16 ippathid; | |
270 | u8 ipflags1; | |
271 | u8 iprcode; | |
272 | u32 ipmsgid; | |
273 | u8 ipaudit[3]; | |
274 | u8 res1[5]; | |
275 | u32 res2; | |
276 | u32 ipsrccls; | |
277 | u32 ipmsgtag; | |
278 | u32 res3[3]; | |
279 | } __attribute__ ((packed,aligned(8))); | |
280 | ||
281 | /* | |
282 | * Set mask iucv structure. Used by iucv_enable_cpu. | |
283 | */ | |
284 | struct iucv_cmd_set_mask { | |
285 | u8 ipmask; | |
286 | u8 res1[2]; | |
287 | u8 iprcode; | |
288 | u32 res2[9]; | |
289 | } __attribute__ ((packed,aligned(8))); | |
290 | ||
291 | union iucv_param { | |
292 | struct iucv_cmd_control ctrl; | |
293 | struct iucv_cmd_dpl dpl; | |
294 | struct iucv_cmd_db db; | |
295 | struct iucv_cmd_purge purge; | |
296 | struct iucv_cmd_set_mask set_mask; | |
297 | }; | |
298 | ||
299 | /* | |
300 | * Anchor for per-cpu IUCV command parameter block. | |
301 | */ | |
70cf5035 | 302 | static union iucv_param *iucv_param[NR_CPUS]; |
42e1b4c2 | 303 | static union iucv_param *iucv_param_irq[NR_CPUS]; |
2356f4cb MS |
304 | |
305 | /** | |
306 | * iucv_call_b2f0 | |
307 | * @code: identifier of IUCV call to CP. | |
308 | * @parm: pointer to a struct iucv_parm block | |
309 | * | |
310 | * Calls CP to execute IUCV commands. | |
311 | * | |
312 | * Returns the result of the CP IUCV call. | |
313 | */ | |
314 | static inline int iucv_call_b2f0(int command, union iucv_param *parm) | |
315 | { | |
316 | register unsigned long reg0 asm ("0"); | |
317 | register unsigned long reg1 asm ("1"); | |
318 | int ccode; | |
319 | ||
320 | reg0 = command; | |
321 | reg1 = virt_to_phys(parm); | |
322 | asm volatile( | |
323 | " .long 0xb2f01000\n" | |
324 | " ipm %0\n" | |
325 | " srl %0,28\n" | |
326 | : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1) | |
327 | : "m" (*parm) : "cc"); | |
328 | return (ccode == 1) ? parm->ctrl.iprcode : ccode; | |
329 | } | |
330 | ||
331 | /** | |
332 | * iucv_query_maxconn | |
333 | * | |
334 | * Determines the maximum number of connections that may be established. | |
335 | * | |
336 | * Returns the maximum number of connections or -EPERM is IUCV is not | |
337 | * available. | |
338 | */ | |
339 | static int iucv_query_maxconn(void) | |
340 | { | |
341 | register unsigned long reg0 asm ("0"); | |
342 | register unsigned long reg1 asm ("1"); | |
343 | void *param; | |
344 | int ccode; | |
345 | ||
346 | param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA); | |
347 | if (!param) | |
348 | return -ENOMEM; | |
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"); | |
356 | if (ccode == 0) | |
357 | iucv_max_pathid = reg0; | |
358 | kfree(param); | |
359 | return ccode ? -EPERM : 0; | |
360 | } | |
361 | ||
362 | /** | |
363 | * iucv_allow_cpu | |
364 | * @data: unused | |
365 | * | |
366 | * Allow iucv interrupts on this cpu. | |
367 | */ | |
368 | static void iucv_allow_cpu(void *data) | |
369 | { | |
370 | int cpu = smp_processor_id(); | |
371 | union iucv_param *parm; | |
372 | ||
373 | /* | |
374 | * Enable all iucv interrupts. | |
375 | * ipmask contains bits for the different interrupts | |
376 | * 0x80 - Flag to allow nonpriority message pending interrupts | |
377 | * 0x40 - Flag to allow priority message pending interrupts | |
378 | * 0x20 - Flag to allow nonpriority message completion interrupts | |
379 | * 0x10 - Flag to allow priority message completion interrupts | |
380 | * 0x08 - Flag to allow IUCV control interrupts | |
381 | */ | |
42e1b4c2 | 382 | parm = iucv_param_irq[cpu]; |
2356f4cb MS |
383 | memset(parm, 0, sizeof(union iucv_param)); |
384 | parm->set_mask.ipmask = 0xf8; | |
385 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
386 | ||
672e405b UB |
387 | /* |
388 | * Enable all iucv control interrupts. | |
389 | * ipmask contains bits for the different interrupts | |
390 | * 0x80 - Flag to allow pending connections interrupts | |
391 | * 0x40 - Flag to allow connection complete interrupts | |
392 | * 0x20 - Flag to allow connection severed interrupts | |
393 | * 0x10 - Flag to allow connection quiesced interrupts | |
394 | * 0x08 - Flag to allow connection resumed interrupts | |
395 | */ | |
396 | memset(parm, 0, sizeof(union iucv_param)); | |
397 | parm->set_mask.ipmask = 0xf8; | |
398 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); | |
2356f4cb MS |
399 | /* Set indication that iucv interrupts are allowed for this cpu. */ |
400 | cpu_set(cpu, iucv_irq_cpumask); | |
401 | } | |
402 | ||
403 | /** | |
404 | * iucv_block_cpu | |
405 | * @data: unused | |
406 | * | |
407 | * Block iucv interrupts on this cpu. | |
408 | */ | |
409 | static void iucv_block_cpu(void *data) | |
410 | { | |
411 | int cpu = smp_processor_id(); | |
412 | union iucv_param *parm; | |
413 | ||
414 | /* Disable all iucv interrupts. */ | |
42e1b4c2 | 415 | parm = iucv_param_irq[cpu]; |
2356f4cb MS |
416 | memset(parm, 0, sizeof(union iucv_param)); |
417 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
418 | ||
419 | /* Clear indication that iucv interrupts are allowed for this cpu. */ | |
420 | cpu_clear(cpu, iucv_irq_cpumask); | |
421 | } | |
422 | ||
672e405b UB |
423 | /** |
424 | * iucv_block_cpu_almost | |
425 | * @data: unused | |
426 | * | |
427 | * Allow connection-severed interrupts only on this cpu. | |
428 | */ | |
429 | static void iucv_block_cpu_almost(void *data) | |
430 | { | |
431 | int cpu = smp_processor_id(); | |
432 | union iucv_param *parm; | |
433 | ||
434 | /* Allow iucv control interrupts only */ | |
435 | parm = iucv_param_irq[cpu]; | |
436 | memset(parm, 0, sizeof(union iucv_param)); | |
437 | parm->set_mask.ipmask = 0x08; | |
438 | iucv_call_b2f0(IUCV_SETMASK, parm); | |
439 | /* Allow iucv-severed interrupt only */ | |
440 | memset(parm, 0, sizeof(union iucv_param)); | |
441 | parm->set_mask.ipmask = 0x20; | |
442 | iucv_call_b2f0(IUCV_SETCONTROLMASK, parm); | |
443 | ||
444 | /* Clear indication that iucv interrupts are allowed for this cpu. */ | |
445 | cpu_clear(cpu, iucv_irq_cpumask); | |
446 | } | |
447 | ||
2356f4cb MS |
448 | /** |
449 | * iucv_declare_cpu | |
450 | * @data: unused | |
451 | * | |
3a4fa0a2 | 452 | * Declare a interrupt buffer on this cpu. |
2356f4cb MS |
453 | */ |
454 | static void iucv_declare_cpu(void *data) | |
455 | { | |
456 | int cpu = smp_processor_id(); | |
457 | union iucv_param *parm; | |
458 | int rc; | |
459 | ||
460 | if (cpu_isset(cpu, iucv_buffer_cpumask)) | |
461 | return; | |
462 | ||
463 | /* Declare interrupt buffer. */ | |
42e1b4c2 | 464 | parm = iucv_param_irq[cpu]; |
2356f4cb | 465 | memset(parm, 0, sizeof(union iucv_param)); |
70cf5035 | 466 | parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]); |
2356f4cb MS |
467 | rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm); |
468 | if (rc) { | |
469 | char *err = "Unknown"; | |
da99f056 | 470 | switch (rc) { |
2356f4cb MS |
471 | case 0x03: |
472 | err = "Directory error"; | |
473 | break; | |
474 | case 0x0a: | |
475 | err = "Invalid length"; | |
476 | break; | |
477 | case 0x13: | |
478 | err = "Buffer already exists"; | |
479 | break; | |
480 | case 0x3e: | |
481 | err = "Buffer overlap"; | |
482 | break; | |
483 | case 0x5c: | |
484 | err = "Paging or storage error"; | |
485 | break; | |
486 | } | |
8f7c502c UB |
487 | pr_warning("Defining an interrupt buffer on CPU %i" |
488 | " failed with 0x%02x (%s)\n", cpu, rc, err); | |
2356f4cb MS |
489 | return; |
490 | } | |
491 | ||
492 | /* Set indication that an iucv buffer exists for this cpu. */ | |
493 | cpu_set(cpu, iucv_buffer_cpumask); | |
494 | ||
495 | if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask)) | |
496 | /* Enable iucv interrupts on this cpu. */ | |
497 | iucv_allow_cpu(NULL); | |
498 | else | |
499 | /* Disable iucv interrupts on this cpu. */ | |
500 | iucv_block_cpu(NULL); | |
501 | } | |
502 | ||
503 | /** | |
504 | * iucv_retrieve_cpu | |
505 | * @data: unused | |
506 | * | |
507 | * Retrieve interrupt buffer on this cpu. | |
508 | */ | |
509 | static void iucv_retrieve_cpu(void *data) | |
510 | { | |
511 | int cpu = smp_processor_id(); | |
512 | union iucv_param *parm; | |
513 | ||
514 | if (!cpu_isset(cpu, iucv_buffer_cpumask)) | |
515 | return; | |
516 | ||
517 | /* Block iucv interrupts. */ | |
518 | iucv_block_cpu(NULL); | |
519 | ||
520 | /* Retrieve interrupt buffer. */ | |
42e1b4c2 | 521 | parm = iucv_param_irq[cpu]; |
2356f4cb MS |
522 | iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm); |
523 | ||
524 | /* Clear indication that an iucv buffer exists for this cpu. */ | |
525 | cpu_clear(cpu, iucv_buffer_cpumask); | |
526 | } | |
527 | ||
528 | /** | |
529 | * iucv_setmask_smp | |
530 | * | |
531 | * Allow iucv interrupts on all cpus. | |
532 | */ | |
533 | static void iucv_setmask_mp(void) | |
534 | { | |
535 | int cpu; | |
536 | ||
7b9d1b22 | 537 | get_online_cpus(); |
2356f4cb MS |
538 | for_each_online_cpu(cpu) |
539 | /* Enable all cpus with a declared buffer. */ | |
540 | if (cpu_isset(cpu, iucv_buffer_cpumask) && | |
541 | !cpu_isset(cpu, iucv_irq_cpumask)) | |
3bb447fc | 542 | smp_call_function_single(cpu, iucv_allow_cpu, |
8691e5a8 | 543 | NULL, 1); |
7b9d1b22 | 544 | put_online_cpus(); |
2356f4cb MS |
545 | } |
546 | ||
547 | /** | |
548 | * iucv_setmask_up | |
549 | * | |
04b090d5 | 550 | * Allow iucv interrupts on a single cpu. |
2356f4cb MS |
551 | */ |
552 | static void iucv_setmask_up(void) | |
553 | { | |
554 | cpumask_t cpumask; | |
555 | int cpu; | |
556 | ||
557 | /* Disable all cpu but the first in cpu_irq_cpumask. */ | |
558 | cpumask = iucv_irq_cpumask; | |
559 | cpu_clear(first_cpu(iucv_irq_cpumask), cpumask); | |
0e12f848 | 560 | for_each_cpu_mask_nr(cpu, cpumask) |
8691e5a8 | 561 | smp_call_function_single(cpu, iucv_block_cpu, NULL, 1); |
2356f4cb MS |
562 | } |
563 | ||
564 | /** | |
565 | * iucv_enable | |
566 | * | |
567 | * This function makes iucv ready for use. It allocates the pathid | |
568 | * table, declares an iucv interrupt buffer and enables the iucv | |
569 | * interrupts. Called when the first user has registered an iucv | |
570 | * handler. | |
571 | */ | |
572 | static int iucv_enable(void) | |
573 | { | |
574 | size_t alloc_size; | |
575 | int cpu, rc; | |
576 | ||
f1d3e4dc | 577 | get_online_cpus(); |
2356f4cb MS |
578 | rc = -ENOMEM; |
579 | alloc_size = iucv_max_pathid * sizeof(struct iucv_path); | |
580 | iucv_path_table = kzalloc(alloc_size, GFP_KERNEL); | |
581 | if (!iucv_path_table) | |
582 | goto out; | |
583 | /* Declare per cpu buffers. */ | |
584 | rc = -EIO; | |
585 | for_each_online_cpu(cpu) | |
8691e5a8 | 586 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
587 | if (cpus_empty(iucv_buffer_cpumask)) |
588 | /* No cpu could declare an iucv buffer. */ | |
f1d3e4dc | 589 | goto out; |
7b9d1b22 | 590 | put_online_cpus(); |
2356f4cb | 591 | return 0; |
2356f4cb | 592 | out: |
f1d3e4dc HC |
593 | kfree(iucv_path_table); |
594 | iucv_path_table = NULL; | |
595 | put_online_cpus(); | |
2356f4cb MS |
596 | return rc; |
597 | } | |
598 | ||
599 | /** | |
600 | * iucv_disable | |
601 | * | |
602 | * This function shuts down iucv. It disables iucv interrupts, retrieves | |
603 | * the iucv interrupt buffer and frees the pathid table. Called after the | |
604 | * last user unregister its iucv handler. | |
605 | */ | |
606 | static void iucv_disable(void) | |
607 | { | |
8b122efd | 608 | get_online_cpus(); |
15c8b6c1 | 609 | on_each_cpu(iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 610 | kfree(iucv_path_table); |
f1d3e4dc HC |
611 | iucv_path_table = NULL; |
612 | put_online_cpus(); | |
2356f4cb MS |
613 | } |
614 | ||
2356f4cb MS |
615 | static int __cpuinit iucv_cpu_notify(struct notifier_block *self, |
616 | unsigned long action, void *hcpu) | |
617 | { | |
618 | cpumask_t cpumask; | |
619 | long cpu = (long) hcpu; | |
620 | ||
621 | switch (action) { | |
622 | case CPU_UP_PREPARE: | |
8bb78442 | 623 | case CPU_UP_PREPARE_FROZEN: |
70cf5035 CL |
624 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), |
625 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
626 | if (!iucv_irq_data[cpu]) | |
2356f4cb | 627 | return NOTIFY_BAD; |
70cf5035 CL |
628 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), |
629 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
d0236f8f AM |
630 | if (!iucv_param[cpu]) { |
631 | kfree(iucv_irq_data[cpu]); | |
632 | iucv_irq_data[cpu] = NULL; | |
2356f4cb | 633 | return NOTIFY_BAD; |
d0236f8f | 634 | } |
42e1b4c2 UB |
635 | iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), |
636 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
637 | if (!iucv_param_irq[cpu]) { | |
638 | kfree(iucv_param[cpu]); | |
639 | iucv_param[cpu] = NULL; | |
640 | kfree(iucv_irq_data[cpu]); | |
641 | iucv_irq_data[cpu] = NULL; | |
642 | return NOTIFY_BAD; | |
643 | } | |
2356f4cb MS |
644 | break; |
645 | case CPU_UP_CANCELED: | |
8bb78442 | 646 | case CPU_UP_CANCELED_FROZEN: |
2356f4cb | 647 | case CPU_DEAD: |
8bb78442 | 648 | case CPU_DEAD_FROZEN: |
42e1b4c2 UB |
649 | kfree(iucv_param_irq[cpu]); |
650 | iucv_param_irq[cpu] = NULL; | |
70cf5035 CL |
651 | kfree(iucv_param[cpu]); |
652 | iucv_param[cpu] = NULL; | |
653 | kfree(iucv_irq_data[cpu]); | |
654 | iucv_irq_data[cpu] = NULL; | |
2356f4cb MS |
655 | break; |
656 | case CPU_ONLINE: | |
8bb78442 | 657 | case CPU_ONLINE_FROZEN: |
2356f4cb | 658 | case CPU_DOWN_FAILED: |
8bb78442 | 659 | case CPU_DOWN_FAILED_FROZEN: |
f1d3e4dc HC |
660 | if (!iucv_path_table) |
661 | break; | |
8691e5a8 | 662 | smp_call_function_single(cpu, iucv_declare_cpu, NULL, 1); |
2356f4cb MS |
663 | break; |
664 | case CPU_DOWN_PREPARE: | |
8bb78442 | 665 | case CPU_DOWN_PREPARE_FROZEN: |
f1d3e4dc HC |
666 | if (!iucv_path_table) |
667 | break; | |
2356f4cb MS |
668 | cpumask = iucv_buffer_cpumask; |
669 | cpu_clear(cpu, cpumask); | |
670 | if (cpus_empty(cpumask)) | |
671 | /* Can't offline last IUCV enabled cpu. */ | |
672 | return NOTIFY_BAD; | |
8691e5a8 | 673 | smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 1); |
2356f4cb | 674 | if (cpus_empty(iucv_irq_cpumask)) |
3bb447fc | 675 | smp_call_function_single(first_cpu(iucv_buffer_cpumask), |
8691e5a8 | 676 | iucv_allow_cpu, NULL, 1); |
2356f4cb MS |
677 | break; |
678 | } | |
679 | return NOTIFY_OK; | |
680 | } | |
681 | ||
f1494ed1 | 682 | static struct notifier_block __refdata iucv_cpu_notifier = { |
2356f4cb MS |
683 | .notifier_call = iucv_cpu_notify, |
684 | }; | |
2356f4cb MS |
685 | |
686 | /** | |
687 | * iucv_sever_pathid | |
688 | * @pathid: path identification number. | |
689 | * @userdata: 16-bytes of user data. | |
690 | * | |
691 | * Sever an iucv path to free up the pathid. Used internally. | |
692 | */ | |
693 | static int iucv_sever_pathid(u16 pathid, u8 userdata[16]) | |
694 | { | |
695 | union iucv_param *parm; | |
696 | ||
42e1b4c2 | 697 | parm = iucv_param_irq[smp_processor_id()]; |
2356f4cb MS |
698 | memset(parm, 0, sizeof(union iucv_param)); |
699 | if (userdata) | |
700 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
701 | parm->ctrl.ippathid = pathid; | |
702 | return iucv_call_b2f0(IUCV_SEVER, parm); | |
703 | } | |
704 | ||
705 | /** | |
04b090d5 | 706 | * __iucv_cleanup_queue |
2356f4cb MS |
707 | * @dummy: unused dummy argument |
708 | * | |
709 | * Nop function called via smp_call_function to force work items from | |
710 | * pending external iucv interrupts to the work queue. | |
711 | */ | |
04b090d5 | 712 | static void __iucv_cleanup_queue(void *dummy) |
2356f4cb MS |
713 | { |
714 | } | |
715 | ||
716 | /** | |
04b090d5 | 717 | * iucv_cleanup_queue |
2356f4cb MS |
718 | * |
719 | * Function called after a path has been severed to find all remaining | |
720 | * work items for the now stale pathid. The caller needs to hold the | |
721 | * iucv_table_lock. | |
722 | */ | |
04b090d5 | 723 | static void iucv_cleanup_queue(void) |
2356f4cb | 724 | { |
04b090d5 | 725 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
726 | |
727 | /* | |
04b090d5 MS |
728 | * When a path is severed, the pathid can be reused immediatly |
729 | * on a iucv connect or a connection pending interrupt. Remove | |
730 | * all entries from the task queue that refer to a stale pathid | |
731 | * (iucv_path_table[ix] == NULL). Only then do the iucv connect | |
732 | * or deliver the connection pending interrupt. To get all the | |
733 | * pending interrupts force them to the work queue by calling | |
734 | * an empty function on all cpus. | |
2356f4cb | 735 | */ |
8691e5a8 | 736 | smp_call_function(__iucv_cleanup_queue, NULL, 1); |
04b090d5 MS |
737 | spin_lock_irq(&iucv_queue_lock); |
738 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) { | |
739 | /* Remove stale work items from the task queue. */ | |
740 | if (iucv_path_table[p->data.ippathid] == NULL) { | |
2356f4cb MS |
741 | list_del(&p->list); |
742 | kfree(p); | |
743 | } | |
744 | } | |
04b090d5 | 745 | spin_unlock_irq(&iucv_queue_lock); |
2356f4cb MS |
746 | } |
747 | ||
748 | /** | |
749 | * iucv_register: | |
750 | * @handler: address of iucv handler structure | |
751 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
752 | * | |
753 | * Registers a driver with IUCV. | |
754 | * | |
755 | * Returns 0 on success, -ENOMEM if the memory allocation for the pathid | |
756 | * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. | |
757 | */ | |
758 | int iucv_register(struct iucv_handler *handler, int smp) | |
759 | { | |
760 | int rc; | |
761 | ||
762 | if (!iucv_available) | |
763 | return -ENOSYS; | |
764 | mutex_lock(&iucv_register_mutex); | |
765 | if (!smp) | |
766 | iucv_nonsmp_handler++; | |
767 | if (list_empty(&iucv_handler_list)) { | |
768 | rc = iucv_enable(); | |
769 | if (rc) | |
770 | goto out_mutex; | |
771 | } else if (!smp && iucv_nonsmp_handler == 1) | |
772 | iucv_setmask_up(); | |
773 | INIT_LIST_HEAD(&handler->paths); | |
774 | ||
435bc9df | 775 | spin_lock_bh(&iucv_table_lock); |
2356f4cb | 776 | list_add_tail(&handler->list, &iucv_handler_list); |
435bc9df | 777 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
778 | rc = 0; |
779 | out_mutex: | |
780 | mutex_unlock(&iucv_register_mutex); | |
781 | return rc; | |
782 | } | |
da99f056 | 783 | EXPORT_SYMBOL(iucv_register); |
2356f4cb MS |
784 | |
785 | /** | |
786 | * iucv_unregister | |
787 | * @handler: address of iucv handler structure | |
788 | * @smp: != 0 indicates that the handler can deal with out of order messages | |
789 | * | |
790 | * Unregister driver from IUCV. | |
791 | */ | |
792 | void iucv_unregister(struct iucv_handler *handler, int smp) | |
793 | { | |
794 | struct iucv_path *p, *n; | |
795 | ||
796 | mutex_lock(&iucv_register_mutex); | |
797 | spin_lock_bh(&iucv_table_lock); | |
798 | /* Remove handler from the iucv_handler_list. */ | |
799 | list_del_init(&handler->list); | |
800 | /* Sever all pathids still refering to the handler. */ | |
801 | list_for_each_entry_safe(p, n, &handler->paths, list) { | |
802 | iucv_sever_pathid(p->pathid, NULL); | |
803 | iucv_path_table[p->pathid] = NULL; | |
804 | list_del(&p->list); | |
2356f4cb MS |
805 | iucv_path_free(p); |
806 | } | |
807 | spin_unlock_bh(&iucv_table_lock); | |
808 | if (!smp) | |
809 | iucv_nonsmp_handler--; | |
810 | if (list_empty(&iucv_handler_list)) | |
811 | iucv_disable(); | |
812 | else if (!smp && iucv_nonsmp_handler == 0) | |
813 | iucv_setmask_mp(); | |
814 | mutex_unlock(&iucv_register_mutex); | |
815 | } | |
da99f056 | 816 | EXPORT_SYMBOL(iucv_unregister); |
2356f4cb | 817 | |
6c005961 UB |
818 | static int iucv_reboot_event(struct notifier_block *this, |
819 | unsigned long event, void *ptr) | |
820 | { | |
821 | int i, rc; | |
822 | ||
823 | get_online_cpus(); | |
824 | on_each_cpu(iucv_block_cpu, NULL, 1); | |
825 | preempt_disable(); | |
826 | for (i = 0; i < iucv_max_pathid; i++) { | |
827 | if (iucv_path_table[i]) | |
828 | rc = iucv_sever_pathid(i, NULL); | |
829 | } | |
830 | preempt_enable(); | |
831 | put_online_cpus(); | |
832 | iucv_disable(); | |
833 | return NOTIFY_DONE; | |
834 | } | |
835 | ||
836 | static struct notifier_block iucv_reboot_notifier = { | |
837 | .notifier_call = iucv_reboot_event, | |
838 | }; | |
839 | ||
2356f4cb MS |
840 | /** |
841 | * iucv_path_accept | |
842 | * @path: address of iucv path structure | |
843 | * @handler: address of iucv handler structure | |
844 | * @userdata: 16 bytes of data reflected to the communication partner | |
845 | * @private: private data passed to interrupt handlers for this path | |
846 | * | |
847 | * This function is issued after the user received a connection pending | |
848 | * external interrupt and now wishes to complete the IUCV communication path. | |
849 | * | |
850 | * Returns the result of the CP IUCV call. | |
851 | */ | |
852 | int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, | |
853 | u8 userdata[16], void *private) | |
854 | { | |
855 | union iucv_param *parm; | |
856 | int rc; | |
857 | ||
858 | local_bh_disable(); | |
6c005961 UB |
859 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
860 | rc = -EIO; | |
861 | goto out; | |
862 | } | |
2356f4cb | 863 | /* Prepare parameter block. */ |
70cf5035 | 864 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
865 | memset(parm, 0, sizeof(union iucv_param)); |
866 | parm->ctrl.ippathid = path->pathid; | |
867 | parm->ctrl.ipmsglim = path->msglim; | |
868 | if (userdata) | |
869 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
870 | parm->ctrl.ipflags1 = path->flags; | |
871 | ||
872 | rc = iucv_call_b2f0(IUCV_ACCEPT, parm); | |
873 | if (!rc) { | |
874 | path->private = private; | |
875 | path->msglim = parm->ctrl.ipmsglim; | |
876 | path->flags = parm->ctrl.ipflags1; | |
877 | } | |
6c005961 | 878 | out: |
2356f4cb MS |
879 | local_bh_enable(); |
880 | return rc; | |
881 | } | |
da99f056 | 882 | EXPORT_SYMBOL(iucv_path_accept); |
2356f4cb MS |
883 | |
884 | /** | |
885 | * iucv_path_connect | |
886 | * @path: address of iucv path structure | |
887 | * @handler: address of iucv handler structure | |
888 | * @userid: 8-byte user identification | |
889 | * @system: 8-byte target system identification | |
890 | * @userdata: 16 bytes of data reflected to the communication partner | |
891 | * @private: private data passed to interrupt handlers for this path | |
892 | * | |
893 | * This function establishes an IUCV path. Although the connect may complete | |
894 | * successfully, you are not able to use the path until you receive an IUCV | |
895 | * Connection Complete external interrupt. | |
896 | * | |
897 | * Returns the result of the CP IUCV call. | |
898 | */ | |
899 | int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, | |
900 | u8 userid[8], u8 system[8], u8 userdata[16], | |
901 | void *private) | |
902 | { | |
903 | union iucv_param *parm; | |
904 | int rc; | |
905 | ||
04b090d5 MS |
906 | spin_lock_bh(&iucv_table_lock); |
907 | iucv_cleanup_queue(); | |
6c005961 UB |
908 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
909 | rc = -EIO; | |
910 | goto out; | |
911 | } | |
70cf5035 | 912 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
913 | memset(parm, 0, sizeof(union iucv_param)); |
914 | parm->ctrl.ipmsglim = path->msglim; | |
915 | parm->ctrl.ipflags1 = path->flags; | |
916 | if (userid) { | |
917 | memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid)); | |
918 | ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
919 | EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid)); | |
920 | } | |
921 | if (system) { | |
922 | memcpy(parm->ctrl.iptarget, system, | |
923 | sizeof(parm->ctrl.iptarget)); | |
924 | ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
925 | EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget)); | |
926 | } | |
927 | if (userdata) | |
928 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
929 | ||
930 | rc = iucv_call_b2f0(IUCV_CONNECT, parm); | |
931 | if (!rc) { | |
932 | if (parm->ctrl.ippathid < iucv_max_pathid) { | |
933 | path->pathid = parm->ctrl.ippathid; | |
934 | path->msglim = parm->ctrl.ipmsglim; | |
935 | path->flags = parm->ctrl.ipflags1; | |
936 | path->handler = handler; | |
937 | path->private = private; | |
938 | list_add_tail(&path->list, &handler->paths); | |
939 | iucv_path_table[path->pathid] = path; | |
940 | } else { | |
941 | iucv_sever_pathid(parm->ctrl.ippathid, | |
942 | iucv_error_pathid); | |
943 | rc = -EIO; | |
944 | } | |
945 | } | |
6c005961 | 946 | out: |
04b090d5 | 947 | spin_unlock_bh(&iucv_table_lock); |
2356f4cb MS |
948 | return rc; |
949 | } | |
da99f056 | 950 | EXPORT_SYMBOL(iucv_path_connect); |
2356f4cb MS |
951 | |
952 | /** | |
953 | * iucv_path_quiesce: | |
954 | * @path: address of iucv path structure | |
955 | * @userdata: 16 bytes of data reflected to the communication partner | |
956 | * | |
957 | * This function temporarily suspends incoming messages on an IUCV path. | |
958 | * You can later reactivate the path by invoking the iucv_resume function. | |
959 | * | |
960 | * Returns the result from the CP IUCV call. | |
961 | */ | |
962 | int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]) | |
963 | { | |
964 | union iucv_param *parm; | |
965 | int rc; | |
966 | ||
967 | local_bh_disable(); | |
6c005961 UB |
968 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
969 | rc = -EIO; | |
970 | goto out; | |
971 | } | |
70cf5035 | 972 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
973 | memset(parm, 0, sizeof(union iucv_param)); |
974 | if (userdata) | |
975 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
976 | parm->ctrl.ippathid = path->pathid; | |
977 | rc = iucv_call_b2f0(IUCV_QUIESCE, parm); | |
6c005961 | 978 | out: |
2356f4cb MS |
979 | local_bh_enable(); |
980 | return rc; | |
981 | } | |
da99f056 | 982 | EXPORT_SYMBOL(iucv_path_quiesce); |
2356f4cb MS |
983 | |
984 | /** | |
985 | * iucv_path_resume: | |
986 | * @path: address of iucv path structure | |
987 | * @userdata: 16 bytes of data reflected to the communication partner | |
988 | * | |
989 | * This function resumes incoming messages on an IUCV path that has | |
990 | * been stopped with iucv_path_quiesce. | |
991 | * | |
992 | * Returns the result from the CP IUCV call. | |
993 | */ | |
994 | int iucv_path_resume(struct iucv_path *path, u8 userdata[16]) | |
995 | { | |
996 | union iucv_param *parm; | |
997 | int rc; | |
998 | ||
999 | local_bh_disable(); | |
6c005961 UB |
1000 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1001 | rc = -EIO; | |
1002 | goto out; | |
1003 | } | |
70cf5035 | 1004 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1005 | memset(parm, 0, sizeof(union iucv_param)); |
1006 | if (userdata) | |
1007 | memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser)); | |
1008 | parm->ctrl.ippathid = path->pathid; | |
1009 | rc = iucv_call_b2f0(IUCV_RESUME, parm); | |
6c005961 | 1010 | out: |
2356f4cb MS |
1011 | local_bh_enable(); |
1012 | return rc; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * iucv_path_sever | |
1017 | * @path: address of iucv path structure | |
1018 | * @userdata: 16 bytes of data reflected to the communication partner | |
1019 | * | |
1020 | * This function terminates an IUCV path. | |
1021 | * | |
1022 | * Returns the result from the CP IUCV call. | |
1023 | */ | |
1024 | int iucv_path_sever(struct iucv_path *path, u8 userdata[16]) | |
1025 | { | |
1026 | int rc; | |
1027 | ||
2356f4cb | 1028 | preempt_disable(); |
6c005961 UB |
1029 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1030 | rc = -EIO; | |
1031 | goto out; | |
1032 | } | |
04b090d5 | 1033 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb MS |
1034 | spin_lock_bh(&iucv_table_lock); |
1035 | rc = iucv_sever_pathid(path->pathid, userdata); | |
42e1b4c2 UB |
1036 | iucv_path_table[path->pathid] = NULL; |
1037 | list_del_init(&path->list); | |
04b090d5 | 1038 | if (iucv_active_cpu != smp_processor_id()) |
2356f4cb | 1039 | spin_unlock_bh(&iucv_table_lock); |
6c005961 | 1040 | out: |
2356f4cb MS |
1041 | preempt_enable(); |
1042 | return rc; | |
1043 | } | |
da99f056 | 1044 | EXPORT_SYMBOL(iucv_path_sever); |
2356f4cb MS |
1045 | |
1046 | /** | |
1047 | * iucv_message_purge | |
1048 | * @path: address of iucv path structure | |
1049 | * @msg: address of iucv msg structure | |
1050 | * @srccls: source class of message | |
1051 | * | |
1052 | * Cancels a message you have sent. | |
1053 | * | |
1054 | * Returns the result from the CP IUCV call. | |
1055 | */ | |
1056 | int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, | |
1057 | u32 srccls) | |
1058 | { | |
1059 | union iucv_param *parm; | |
1060 | int rc; | |
1061 | ||
1062 | local_bh_disable(); | |
6c005961 UB |
1063 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1064 | rc = -EIO; | |
1065 | goto out; | |
1066 | } | |
70cf5035 | 1067 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1068 | memset(parm, 0, sizeof(union iucv_param)); |
1069 | parm->purge.ippathid = path->pathid; | |
1070 | parm->purge.ipmsgid = msg->id; | |
1071 | parm->purge.ipsrccls = srccls; | |
1072 | parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID; | |
1073 | rc = iucv_call_b2f0(IUCV_PURGE, parm); | |
1074 | if (!rc) { | |
1075 | msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8; | |
1076 | msg->tag = parm->purge.ipmsgtag; | |
1077 | } | |
6c005961 | 1078 | out: |
2356f4cb MS |
1079 | local_bh_enable(); |
1080 | return rc; | |
1081 | } | |
da99f056 | 1082 | EXPORT_SYMBOL(iucv_message_purge); |
2356f4cb MS |
1083 | |
1084 | /** | |
91d5d45e HB |
1085 | * iucv_message_receive_iprmdata |
1086 | * @path: address of iucv path structure | |
1087 | * @msg: address of iucv msg structure | |
1088 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1089 | * @buffer: address of data buffer or address of struct iucv_array | |
1090 | * @size: length of data buffer | |
1091 | * @residual: | |
1092 | * | |
1093 | * Internal function used by iucv_message_receive and __iucv_message_receive | |
1094 | * to receive RMDATA data stored in struct iucv_message. | |
1095 | */ | |
1096 | static int iucv_message_receive_iprmdata(struct iucv_path *path, | |
1097 | struct iucv_message *msg, | |
1098 | u8 flags, void *buffer, | |
1099 | size_t size, size_t *residual) | |
1100 | { | |
1101 | struct iucv_array *array; | |
1102 | u8 *rmmsg; | |
1103 | size_t copy; | |
1104 | ||
1105 | /* | |
1106 | * Message is 8 bytes long and has been stored to the | |
1107 | * message descriptor itself. | |
1108 | */ | |
1109 | if (residual) | |
1110 | *residual = abs(size - 8); | |
1111 | rmmsg = msg->rmmsg; | |
1112 | if (flags & IUCV_IPBUFLST) { | |
1113 | /* Copy to struct iucv_array. */ | |
1114 | size = (size < 8) ? size : 8; | |
1115 | for (array = buffer; size > 0; array++) { | |
1116 | copy = min_t(size_t, size, array->length); | |
1117 | memcpy((u8 *)(addr_t) array->address, | |
1118 | rmmsg, copy); | |
1119 | rmmsg += copy; | |
1120 | size -= copy; | |
1121 | } | |
1122 | } else { | |
1123 | /* Copy to direct buffer. */ | |
1124 | memcpy(buffer, rmmsg, min_t(size_t, size, 8)); | |
1125 | } | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /** | |
1130 | * __iucv_message_receive | |
2356f4cb MS |
1131 | * @path: address of iucv path structure |
1132 | * @msg: address of iucv msg structure | |
1133 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1134 | * @buffer: address of data buffer or address of struct iucv_array | |
1135 | * @size: length of data buffer | |
1136 | * @residual: | |
1137 | * | |
1138 | * This function receives messages that are being sent to you over | |
1139 | * established paths. This function will deal with RMDATA messages | |
1140 | * embedded in struct iucv_message as well. | |
1141 | * | |
91d5d45e HB |
1142 | * Locking: no locking |
1143 | * | |
2356f4cb MS |
1144 | * Returns the result from the CP IUCV call. |
1145 | */ | |
91d5d45e HB |
1146 | int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, |
1147 | u8 flags, void *buffer, size_t size, size_t *residual) | |
2356f4cb MS |
1148 | { |
1149 | union iucv_param *parm; | |
2356f4cb MS |
1150 | int rc; |
1151 | ||
91d5d45e HB |
1152 | if (msg->flags & IUCV_IPRMDATA) |
1153 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1154 | buffer, size, residual); | |
6c005961 UB |
1155 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1156 | rc = -EIO; | |
1157 | goto out; | |
1158 | } | |
70cf5035 | 1159 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1160 | memset(parm, 0, sizeof(union iucv_param)); |
1161 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1162 | parm->db.ipbfln1f = (u32) size; | |
1163 | parm->db.ipmsgid = msg->id; | |
1164 | parm->db.ippathid = path->pathid; | |
1165 | parm->db.iptrgcls = msg->class; | |
1166 | parm->db.ipflags1 = (flags | IUCV_IPFGPID | | |
1167 | IUCV_IPFGMID | IUCV_IPTRGCLS); | |
1168 | rc = iucv_call_b2f0(IUCV_RECEIVE, parm); | |
1169 | if (!rc || rc == 5) { | |
1170 | msg->flags = parm->db.ipflags1; | |
1171 | if (residual) | |
1172 | *residual = parm->db.ipbfln1f; | |
1173 | } | |
6c005961 | 1174 | out: |
91d5d45e HB |
1175 | return rc; |
1176 | } | |
1177 | EXPORT_SYMBOL(__iucv_message_receive); | |
1178 | ||
1179 | /** | |
1180 | * iucv_message_receive | |
1181 | * @path: address of iucv path structure | |
1182 | * @msg: address of iucv msg structure | |
1183 | * @flags: how the message is received (IUCV_IPBUFLST) | |
1184 | * @buffer: address of data buffer or address of struct iucv_array | |
1185 | * @size: length of data buffer | |
1186 | * @residual: | |
1187 | * | |
1188 | * This function receives messages that are being sent to you over | |
1189 | * established paths. This function will deal with RMDATA messages | |
1190 | * embedded in struct iucv_message as well. | |
1191 | * | |
1192 | * Locking: local_bh_enable/local_bh_disable | |
1193 | * | |
1194 | * Returns the result from the CP IUCV call. | |
1195 | */ | |
1196 | int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, | |
1197 | u8 flags, void *buffer, size_t size, size_t *residual) | |
1198 | { | |
1199 | int rc; | |
1200 | ||
1201 | if (msg->flags & IUCV_IPRMDATA) | |
1202 | return iucv_message_receive_iprmdata(path, msg, flags, | |
1203 | buffer, size, residual); | |
1204 | local_bh_disable(); | |
1205 | rc = __iucv_message_receive(path, msg, flags, buffer, size, residual); | |
2356f4cb MS |
1206 | local_bh_enable(); |
1207 | return rc; | |
1208 | } | |
da99f056 | 1209 | EXPORT_SYMBOL(iucv_message_receive); |
2356f4cb MS |
1210 | |
1211 | /** | |
1212 | * iucv_message_reject | |
1213 | * @path: address of iucv path structure | |
1214 | * @msg: address of iucv msg structure | |
1215 | * | |
1216 | * The reject function refuses a specified message. Between the time you | |
1217 | * are notified of a message and the time that you complete the message, | |
1218 | * the message may be rejected. | |
1219 | * | |
1220 | * Returns the result from the CP IUCV call. | |
1221 | */ | |
1222 | int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg) | |
1223 | { | |
1224 | union iucv_param *parm; | |
1225 | int rc; | |
1226 | ||
1227 | local_bh_disable(); | |
6c005961 UB |
1228 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1229 | rc = -EIO; | |
1230 | goto out; | |
1231 | } | |
70cf5035 | 1232 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1233 | memset(parm, 0, sizeof(union iucv_param)); |
1234 | parm->db.ippathid = path->pathid; | |
1235 | parm->db.ipmsgid = msg->id; | |
1236 | parm->db.iptrgcls = msg->class; | |
1237 | parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID); | |
1238 | rc = iucv_call_b2f0(IUCV_REJECT, parm); | |
6c005961 | 1239 | out: |
2356f4cb MS |
1240 | local_bh_enable(); |
1241 | return rc; | |
1242 | } | |
da99f056 | 1243 | EXPORT_SYMBOL(iucv_message_reject); |
2356f4cb MS |
1244 | |
1245 | /** | |
1246 | * iucv_message_reply | |
1247 | * @path: address of iucv path structure | |
1248 | * @msg: address of iucv msg structure | |
1249 | * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1250 | * @reply: address of reply data buffer or address of struct iucv_array | |
1251 | * @size: length of reply data buffer | |
1252 | * | |
1253 | * This function responds to the two-way messages that you receive. You | |
1254 | * must identify completely the message to which you wish to reply. ie, | |
1255 | * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into | |
1256 | * the parameter list. | |
1257 | * | |
1258 | * Returns the result from the CP IUCV call. | |
1259 | */ | |
1260 | int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, | |
1261 | u8 flags, void *reply, size_t size) | |
1262 | { | |
1263 | union iucv_param *parm; | |
1264 | int rc; | |
1265 | ||
1266 | local_bh_disable(); | |
6c005961 UB |
1267 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1268 | rc = -EIO; | |
1269 | goto out; | |
1270 | } | |
70cf5035 | 1271 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1272 | memset(parm, 0, sizeof(union iucv_param)); |
1273 | if (flags & IUCV_IPRMDATA) { | |
1274 | parm->dpl.ippathid = path->pathid; | |
1275 | parm->dpl.ipflags1 = flags; | |
1276 | parm->dpl.ipmsgid = msg->id; | |
1277 | parm->dpl.iptrgcls = msg->class; | |
1278 | memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8)); | |
1279 | } else { | |
1280 | parm->db.ipbfadr1 = (u32)(addr_t) reply; | |
1281 | parm->db.ipbfln1f = (u32) size; | |
1282 | parm->db.ippathid = path->pathid; | |
1283 | parm->db.ipflags1 = flags; | |
1284 | parm->db.ipmsgid = msg->id; | |
1285 | parm->db.iptrgcls = msg->class; | |
1286 | } | |
1287 | rc = iucv_call_b2f0(IUCV_REPLY, parm); | |
6c005961 | 1288 | out: |
2356f4cb MS |
1289 | local_bh_enable(); |
1290 | return rc; | |
1291 | } | |
da99f056 | 1292 | EXPORT_SYMBOL(iucv_message_reply); |
2356f4cb MS |
1293 | |
1294 | /** | |
91d5d45e | 1295 | * __iucv_message_send |
2356f4cb MS |
1296 | * @path: address of iucv path structure |
1297 | * @msg: address of iucv msg structure | |
1298 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1299 | * @srccls: source class of message | |
1300 | * @buffer: address of send buffer or address of struct iucv_array | |
1301 | * @size: length of send buffer | |
1302 | * | |
1303 | * This function transmits data to another application. Data to be | |
1304 | * transmitted is in a buffer and this is a one-way message and the | |
1305 | * receiver will not reply to the message. | |
1306 | * | |
91d5d45e HB |
1307 | * Locking: no locking |
1308 | * | |
2356f4cb MS |
1309 | * Returns the result from the CP IUCV call. |
1310 | */ | |
91d5d45e | 1311 | int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, |
2356f4cb MS |
1312 | u8 flags, u32 srccls, void *buffer, size_t size) |
1313 | { | |
1314 | union iucv_param *parm; | |
1315 | int rc; | |
1316 | ||
6c005961 UB |
1317 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1318 | rc = -EIO; | |
1319 | goto out; | |
1320 | } | |
70cf5035 | 1321 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1322 | memset(parm, 0, sizeof(union iucv_param)); |
1323 | if (flags & IUCV_IPRMDATA) { | |
1324 | /* Message of 8 bytes can be placed into the parameter list. */ | |
1325 | parm->dpl.ippathid = path->pathid; | |
1326 | parm->dpl.ipflags1 = flags | IUCV_IPNORPY; | |
1327 | parm->dpl.iptrgcls = msg->class; | |
1328 | parm->dpl.ipsrccls = srccls; | |
1329 | parm->dpl.ipmsgtag = msg->tag; | |
1330 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1331 | } else { | |
1332 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1333 | parm->db.ipbfln1f = (u32) size; | |
1334 | parm->db.ippathid = path->pathid; | |
1335 | parm->db.ipflags1 = flags | IUCV_IPNORPY; | |
1336 | parm->db.iptrgcls = msg->class; | |
1337 | parm->db.ipsrccls = srccls; | |
1338 | parm->db.ipmsgtag = msg->tag; | |
1339 | } | |
1340 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1341 | if (!rc) | |
1342 | msg->id = parm->db.ipmsgid; | |
6c005961 | 1343 | out: |
91d5d45e HB |
1344 | return rc; |
1345 | } | |
1346 | EXPORT_SYMBOL(__iucv_message_send); | |
1347 | ||
1348 | /** | |
1349 | * iucv_message_send | |
1350 | * @path: address of iucv path structure | |
1351 | * @msg: address of iucv msg structure | |
1352 | * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) | |
1353 | * @srccls: source class of message | |
1354 | * @buffer: address of send buffer or address of struct iucv_array | |
1355 | * @size: length of send buffer | |
1356 | * | |
1357 | * This function transmits data to another application. Data to be | |
1358 | * transmitted is in a buffer and this is a one-way message and the | |
1359 | * receiver will not reply to the message. | |
1360 | * | |
1361 | * Locking: local_bh_enable/local_bh_disable | |
1362 | * | |
1363 | * Returns the result from the CP IUCV call. | |
1364 | */ | |
1365 | int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, | |
1366 | u8 flags, u32 srccls, void *buffer, size_t size) | |
1367 | { | |
1368 | int rc; | |
1369 | ||
1370 | local_bh_disable(); | |
1371 | rc = __iucv_message_send(path, msg, flags, srccls, buffer, size); | |
2356f4cb MS |
1372 | local_bh_enable(); |
1373 | return rc; | |
1374 | } | |
da99f056 | 1375 | EXPORT_SYMBOL(iucv_message_send); |
2356f4cb MS |
1376 | |
1377 | /** | |
1378 | * iucv_message_send2way | |
1379 | * @path: address of iucv path structure | |
1380 | * @msg: address of iucv msg structure | |
1381 | * @flags: how the message is sent and the reply is received | |
1382 | * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) | |
1383 | * @srccls: source class of message | |
1384 | * @buffer: address of send buffer or address of struct iucv_array | |
1385 | * @size: length of send buffer | |
1386 | * @ansbuf: address of answer buffer or address of struct iucv_array | |
1387 | * @asize: size of reply buffer | |
1388 | * | |
1389 | * This function transmits data to another application. Data to be | |
1390 | * transmitted is in a buffer. The receiver of the send is expected to | |
1391 | * reply to the message and a buffer is provided into which IUCV moves | |
1392 | * the reply to this message. | |
1393 | * | |
1394 | * Returns the result from the CP IUCV call. | |
1395 | */ | |
1396 | int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, | |
1397 | u8 flags, u32 srccls, void *buffer, size_t size, | |
1398 | void *answer, size_t asize, size_t *residual) | |
1399 | { | |
1400 | union iucv_param *parm; | |
1401 | int rc; | |
1402 | ||
1403 | local_bh_disable(); | |
6c005961 UB |
1404 | if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) { |
1405 | rc = -EIO; | |
1406 | goto out; | |
1407 | } | |
70cf5035 | 1408 | parm = iucv_param[smp_processor_id()]; |
2356f4cb MS |
1409 | memset(parm, 0, sizeof(union iucv_param)); |
1410 | if (flags & IUCV_IPRMDATA) { | |
1411 | parm->dpl.ippathid = path->pathid; | |
1412 | parm->dpl.ipflags1 = path->flags; /* priority message */ | |
1413 | parm->dpl.iptrgcls = msg->class; | |
1414 | parm->dpl.ipsrccls = srccls; | |
1415 | parm->dpl.ipmsgtag = msg->tag; | |
1416 | parm->dpl.ipbfadr2 = (u32)(addr_t) answer; | |
1417 | parm->dpl.ipbfln2f = (u32) asize; | |
1418 | memcpy(parm->dpl.iprmmsg, buffer, 8); | |
1419 | } else { | |
1420 | parm->db.ippathid = path->pathid; | |
1421 | parm->db.ipflags1 = path->flags; /* priority message */ | |
1422 | parm->db.iptrgcls = msg->class; | |
1423 | parm->db.ipsrccls = srccls; | |
1424 | parm->db.ipmsgtag = msg->tag; | |
1425 | parm->db.ipbfadr1 = (u32)(addr_t) buffer; | |
1426 | parm->db.ipbfln1f = (u32) size; | |
1427 | parm->db.ipbfadr2 = (u32)(addr_t) answer; | |
1428 | parm->db.ipbfln2f = (u32) asize; | |
1429 | } | |
1430 | rc = iucv_call_b2f0(IUCV_SEND, parm); | |
1431 | if (!rc) | |
1432 | msg->id = parm->db.ipmsgid; | |
6c005961 | 1433 | out: |
2356f4cb MS |
1434 | local_bh_enable(); |
1435 | return rc; | |
1436 | } | |
da99f056 | 1437 | EXPORT_SYMBOL(iucv_message_send2way); |
2356f4cb MS |
1438 | |
1439 | /** | |
1440 | * iucv_path_pending | |
1441 | * @data: Pointer to external interrupt buffer | |
1442 | * | |
1443 | * Process connection pending work item. Called from tasklet while holding | |
1444 | * iucv_table_lock. | |
1445 | */ | |
1446 | struct iucv_path_pending { | |
1447 | u16 ippathid; | |
1448 | u8 ipflags1; | |
1449 | u8 iptype; | |
1450 | u16 ipmsglim; | |
1451 | u16 res1; | |
1452 | u8 ipvmid[8]; | |
1453 | u8 ipuser[16]; | |
1454 | u32 res3; | |
1455 | u8 ippollfg; | |
1456 | u8 res4[3]; | |
1457 | } __attribute__ ((packed)); | |
1458 | ||
1459 | static void iucv_path_pending(struct iucv_irq_data *data) | |
1460 | { | |
1461 | struct iucv_path_pending *ipp = (void *) data; | |
1462 | struct iucv_handler *handler; | |
1463 | struct iucv_path *path; | |
1464 | char *error; | |
1465 | ||
1466 | BUG_ON(iucv_path_table[ipp->ippathid]); | |
1467 | /* New pathid, handler found. Create a new path struct. */ | |
1468 | error = iucv_error_no_memory; | |
1469 | path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC); | |
1470 | if (!path) | |
1471 | goto out_sever; | |
1472 | path->pathid = ipp->ippathid; | |
1473 | iucv_path_table[path->pathid] = path; | |
1474 | EBCASC(ipp->ipvmid, 8); | |
1475 | ||
1476 | /* Call registered handler until one is found that wants the path. */ | |
1477 | list_for_each_entry(handler, &iucv_handler_list, list) { | |
1478 | if (!handler->path_pending) | |
1479 | continue; | |
1480 | /* | |
1481 | * Add path to handler to allow a call to iucv_path_sever | |
1482 | * inside the path_pending function. If the handler returns | |
1483 | * an error remove the path from the handler again. | |
1484 | */ | |
1485 | list_add(&path->list, &handler->paths); | |
1486 | path->handler = handler; | |
1487 | if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser)) | |
1488 | return; | |
1489 | list_del(&path->list); | |
1490 | path->handler = NULL; | |
1491 | } | |
1492 | /* No handler wanted the path. */ | |
1493 | iucv_path_table[path->pathid] = NULL; | |
1494 | iucv_path_free(path); | |
1495 | error = iucv_error_no_listener; | |
1496 | out_sever: | |
1497 | iucv_sever_pathid(ipp->ippathid, error); | |
1498 | } | |
1499 | ||
1500 | /** | |
1501 | * iucv_path_complete | |
1502 | * @data: Pointer to external interrupt buffer | |
1503 | * | |
1504 | * Process connection complete work item. Called from tasklet while holding | |
1505 | * iucv_table_lock. | |
1506 | */ | |
1507 | struct iucv_path_complete { | |
1508 | u16 ippathid; | |
1509 | u8 ipflags1; | |
1510 | u8 iptype; | |
1511 | u16 ipmsglim; | |
1512 | u16 res1; | |
1513 | u8 res2[8]; | |
1514 | u8 ipuser[16]; | |
1515 | u32 res3; | |
1516 | u8 ippollfg; | |
1517 | u8 res4[3]; | |
1518 | } __attribute__ ((packed)); | |
1519 | ||
1520 | static void iucv_path_complete(struct iucv_irq_data *data) | |
1521 | { | |
1522 | struct iucv_path_complete *ipc = (void *) data; | |
1523 | struct iucv_path *path = iucv_path_table[ipc->ippathid]; | |
1524 | ||
b8942e3b HB |
1525 | if (path) |
1526 | path->flags = ipc->ipflags1; | |
04b090d5 | 1527 | if (path && path->handler && path->handler->path_complete) |
2356f4cb MS |
1528 | path->handler->path_complete(path, ipc->ipuser); |
1529 | } | |
1530 | ||
1531 | /** | |
1532 | * iucv_path_severed | |
1533 | * @data: Pointer to external interrupt buffer | |
1534 | * | |
1535 | * Process connection severed work item. Called from tasklet while holding | |
1536 | * iucv_table_lock. | |
1537 | */ | |
1538 | struct iucv_path_severed { | |
1539 | u16 ippathid; | |
1540 | u8 res1; | |
1541 | u8 iptype; | |
1542 | u32 res2; | |
1543 | u8 res3[8]; | |
1544 | u8 ipuser[16]; | |
1545 | u32 res4; | |
1546 | u8 ippollfg; | |
1547 | u8 res5[3]; | |
1548 | } __attribute__ ((packed)); | |
1549 | ||
1550 | static void iucv_path_severed(struct iucv_irq_data *data) | |
1551 | { | |
1552 | struct iucv_path_severed *ips = (void *) data; | |
1553 | struct iucv_path *path = iucv_path_table[ips->ippathid]; | |
1554 | ||
04b090d5 MS |
1555 | if (!path || !path->handler) /* Already severed */ |
1556 | return; | |
2356f4cb MS |
1557 | if (path->handler->path_severed) |
1558 | path->handler->path_severed(path, ips->ipuser); | |
1559 | else { | |
1560 | iucv_sever_pathid(path->pathid, NULL); | |
1561 | iucv_path_table[path->pathid] = NULL; | |
42e1b4c2 | 1562 | list_del(&path->list); |
2356f4cb MS |
1563 | iucv_path_free(path); |
1564 | } | |
1565 | } | |
1566 | ||
1567 | /** | |
1568 | * iucv_path_quiesced | |
1569 | * @data: Pointer to external interrupt buffer | |
1570 | * | |
1571 | * Process connection quiesced work item. Called from tasklet while holding | |
1572 | * iucv_table_lock. | |
1573 | */ | |
1574 | struct iucv_path_quiesced { | |
1575 | u16 ippathid; | |
1576 | u8 res1; | |
1577 | u8 iptype; | |
1578 | u32 res2; | |
1579 | u8 res3[8]; | |
1580 | u8 ipuser[16]; | |
1581 | u32 res4; | |
1582 | u8 ippollfg; | |
1583 | u8 res5[3]; | |
1584 | } __attribute__ ((packed)); | |
1585 | ||
1586 | static void iucv_path_quiesced(struct iucv_irq_data *data) | |
1587 | { | |
1588 | struct iucv_path_quiesced *ipq = (void *) data; | |
1589 | struct iucv_path *path = iucv_path_table[ipq->ippathid]; | |
1590 | ||
04b090d5 | 1591 | if (path && path->handler && path->handler->path_quiesced) |
2356f4cb MS |
1592 | path->handler->path_quiesced(path, ipq->ipuser); |
1593 | } | |
1594 | ||
1595 | /** | |
1596 | * iucv_path_resumed | |
1597 | * @data: Pointer to external interrupt buffer | |
1598 | * | |
1599 | * Process connection resumed work item. Called from tasklet while holding | |
1600 | * iucv_table_lock. | |
1601 | */ | |
1602 | struct iucv_path_resumed { | |
1603 | u16 ippathid; | |
1604 | u8 res1; | |
1605 | u8 iptype; | |
1606 | u32 res2; | |
1607 | u8 res3[8]; | |
1608 | u8 ipuser[16]; | |
1609 | u32 res4; | |
1610 | u8 ippollfg; | |
1611 | u8 res5[3]; | |
1612 | } __attribute__ ((packed)); | |
1613 | ||
1614 | static void iucv_path_resumed(struct iucv_irq_data *data) | |
1615 | { | |
1616 | struct iucv_path_resumed *ipr = (void *) data; | |
1617 | struct iucv_path *path = iucv_path_table[ipr->ippathid]; | |
1618 | ||
04b090d5 | 1619 | if (path && path->handler && path->handler->path_resumed) |
2356f4cb MS |
1620 | path->handler->path_resumed(path, ipr->ipuser); |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * iucv_message_complete | |
1625 | * @data: Pointer to external interrupt buffer | |
1626 | * | |
1627 | * Process message complete work item. Called from tasklet while holding | |
1628 | * iucv_table_lock. | |
1629 | */ | |
1630 | struct iucv_message_complete { | |
1631 | u16 ippathid; | |
1632 | u8 ipflags1; | |
1633 | u8 iptype; | |
1634 | u32 ipmsgid; | |
1635 | u32 ipaudit; | |
1636 | u8 iprmmsg[8]; | |
1637 | u32 ipsrccls; | |
1638 | u32 ipmsgtag; | |
1639 | u32 res; | |
1640 | u32 ipbfln2f; | |
1641 | u8 ippollfg; | |
1642 | u8 res2[3]; | |
1643 | } __attribute__ ((packed)); | |
1644 | ||
1645 | static void iucv_message_complete(struct iucv_irq_data *data) | |
1646 | { | |
1647 | struct iucv_message_complete *imc = (void *) data; | |
1648 | struct iucv_path *path = iucv_path_table[imc->ippathid]; | |
1649 | struct iucv_message msg; | |
1650 | ||
04b090d5 | 1651 | if (path && path->handler && path->handler->message_complete) { |
2356f4cb MS |
1652 | msg.flags = imc->ipflags1; |
1653 | msg.id = imc->ipmsgid; | |
1654 | msg.audit = imc->ipaudit; | |
1655 | memcpy(msg.rmmsg, imc->iprmmsg, 8); | |
1656 | msg.class = imc->ipsrccls; | |
1657 | msg.tag = imc->ipmsgtag; | |
1658 | msg.length = imc->ipbfln2f; | |
1659 | path->handler->message_complete(path, &msg); | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | /** | |
1664 | * iucv_message_pending | |
1665 | * @data: Pointer to external interrupt buffer | |
1666 | * | |
1667 | * Process message pending work item. Called from tasklet while holding | |
1668 | * iucv_table_lock. | |
1669 | */ | |
1670 | struct iucv_message_pending { | |
1671 | u16 ippathid; | |
1672 | u8 ipflags1; | |
1673 | u8 iptype; | |
1674 | u32 ipmsgid; | |
1675 | u32 iptrgcls; | |
1676 | union { | |
1677 | u32 iprmmsg1_u32; | |
1678 | u8 iprmmsg1[4]; | |
1679 | } ln1msg1; | |
1680 | union { | |
1681 | u32 ipbfln1f; | |
1682 | u8 iprmmsg2[4]; | |
1683 | } ln1msg2; | |
1684 | u32 res1[3]; | |
1685 | u32 ipbfln2f; | |
1686 | u8 ippollfg; | |
1687 | u8 res2[3]; | |
1688 | } __attribute__ ((packed)); | |
1689 | ||
1690 | static void iucv_message_pending(struct iucv_irq_data *data) | |
1691 | { | |
1692 | struct iucv_message_pending *imp = (void *) data; | |
1693 | struct iucv_path *path = iucv_path_table[imp->ippathid]; | |
1694 | struct iucv_message msg; | |
1695 | ||
04b090d5 | 1696 | if (path && path->handler && path->handler->message_pending) { |
2356f4cb MS |
1697 | msg.flags = imp->ipflags1; |
1698 | msg.id = imp->ipmsgid; | |
1699 | msg.class = imp->iptrgcls; | |
1700 | if (imp->ipflags1 & IUCV_IPRMDATA) { | |
1701 | memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8); | |
1702 | msg.length = 8; | |
1703 | } else | |
1704 | msg.length = imp->ln1msg2.ipbfln1f; | |
1705 | msg.reply_size = imp->ipbfln2f; | |
1706 | path->handler->message_pending(path, &msg); | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | /** | |
04b090d5 | 1711 | * iucv_tasklet_fn: |
2356f4cb MS |
1712 | * |
1713 | * This tasklet loops over the queue of irq buffers created by | |
1714 | * iucv_external_interrupt, calls the appropriate action handler | |
1715 | * and then frees the buffer. | |
1716 | */ | |
04b090d5 | 1717 | static void iucv_tasklet_fn(unsigned long ignored) |
2356f4cb MS |
1718 | { |
1719 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
1720 | static iucv_irq_fn *irq_fn[] = { | |
2356f4cb MS |
1721 | [0x02] = iucv_path_complete, |
1722 | [0x03] = iucv_path_severed, | |
1723 | [0x04] = iucv_path_quiesced, | |
1724 | [0x05] = iucv_path_resumed, | |
1725 | [0x06] = iucv_message_complete, | |
1726 | [0x07] = iucv_message_complete, | |
1727 | [0x08] = iucv_message_pending, | |
1728 | [0x09] = iucv_message_pending, | |
1729 | }; | |
b5e78337 | 1730 | LIST_HEAD(task_queue); |
04b090d5 | 1731 | struct iucv_irq_list *p, *n; |
2356f4cb MS |
1732 | |
1733 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
13fdc9a7 UB |
1734 | if (!spin_trylock(&iucv_table_lock)) { |
1735 | tasklet_schedule(&iucv_tasklet); | |
1736 | return; | |
1737 | } | |
04b090d5 | 1738 | iucv_active_cpu = smp_processor_id(); |
2356f4cb | 1739 | |
04b090d5 MS |
1740 | spin_lock_irq(&iucv_queue_lock); |
1741 | list_splice_init(&iucv_task_queue, &task_queue); | |
1742 | spin_unlock_irq(&iucv_queue_lock); | |
1743 | ||
1744 | list_for_each_entry_safe(p, n, &task_queue, list) { | |
2356f4cb | 1745 | list_del_init(&p->list); |
2356f4cb MS |
1746 | irq_fn[p->data.iptype](&p->data); |
1747 | kfree(p); | |
2356f4cb | 1748 | } |
2356f4cb | 1749 | |
04b090d5 | 1750 | iucv_active_cpu = -1; |
2356f4cb MS |
1751 | spin_unlock(&iucv_table_lock); |
1752 | } | |
1753 | ||
04b090d5 MS |
1754 | /** |
1755 | * iucv_work_fn: | |
1756 | * | |
1757 | * This work function loops over the queue of path pending irq blocks | |
1758 | * created by iucv_external_interrupt, calls the appropriate action | |
1759 | * handler and then frees the buffer. | |
1760 | */ | |
1761 | static void iucv_work_fn(struct work_struct *work) | |
1762 | { | |
1763 | typedef void iucv_irq_fn(struct iucv_irq_data *); | |
b5e78337 | 1764 | LIST_HEAD(work_queue); |
04b090d5 MS |
1765 | struct iucv_irq_list *p, *n; |
1766 | ||
1767 | /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */ | |
1768 | spin_lock_bh(&iucv_table_lock); | |
1769 | iucv_active_cpu = smp_processor_id(); | |
1770 | ||
1771 | spin_lock_irq(&iucv_queue_lock); | |
1772 | list_splice_init(&iucv_work_queue, &work_queue); | |
1773 | spin_unlock_irq(&iucv_queue_lock); | |
1774 | ||
1775 | iucv_cleanup_queue(); | |
1776 | list_for_each_entry_safe(p, n, &work_queue, list) { | |
1777 | list_del_init(&p->list); | |
1778 | iucv_path_pending(&p->data); | |
1779 | kfree(p); | |
1780 | } | |
1781 | ||
1782 | iucv_active_cpu = -1; | |
1783 | spin_unlock_bh(&iucv_table_lock); | |
1784 | } | |
1785 | ||
2356f4cb MS |
1786 | /** |
1787 | * iucv_external_interrupt | |
1788 | * @code: irq code | |
1789 | * | |
1790 | * Handles external interrupts coming in from CP. | |
04b090d5 | 1791 | * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). |
2356f4cb MS |
1792 | */ |
1793 | static void iucv_external_interrupt(u16 code) | |
1794 | { | |
1795 | struct iucv_irq_data *p; | |
04b090d5 | 1796 | struct iucv_irq_list *work; |
2356f4cb | 1797 | |
70cf5035 | 1798 | p = iucv_irq_data[smp_processor_id()]; |
2356f4cb | 1799 | if (p->ippathid >= iucv_max_pathid) { |
c2b4afd2 | 1800 | WARN_ON(p->ippathid >= iucv_max_pathid); |
2356f4cb MS |
1801 | iucv_sever_pathid(p->ippathid, iucv_error_no_listener); |
1802 | return; | |
1803 | } | |
c2b4afd2 | 1804 | BUG_ON(p->iptype < 0x01 || p->iptype > 0x09); |
04b090d5 | 1805 | work = kmalloc(sizeof(struct iucv_irq_list), GFP_ATOMIC); |
2356f4cb | 1806 | if (!work) { |
8f7c502c | 1807 | pr_warning("iucv_external_interrupt: out of memory\n"); |
2356f4cb MS |
1808 | return; |
1809 | } | |
1810 | memcpy(&work->data, p, sizeof(work->data)); | |
04b090d5 MS |
1811 | spin_lock(&iucv_queue_lock); |
1812 | if (p->iptype == 0x01) { | |
1813 | /* Path pending interrupt. */ | |
1814 | list_add_tail(&work->list, &iucv_work_queue); | |
1815 | schedule_work(&iucv_work); | |
1816 | } else { | |
1817 | /* The other interrupts. */ | |
1818 | list_add_tail(&work->list, &iucv_task_queue); | |
1819 | tasklet_schedule(&iucv_tasklet); | |
1820 | } | |
1821 | spin_unlock(&iucv_queue_lock); | |
2356f4cb MS |
1822 | } |
1823 | ||
672e405b UB |
1824 | static int iucv_pm_prepare(struct device *dev) |
1825 | { | |
1826 | int rc = 0; | |
1827 | ||
1828 | #ifdef CONFIG_PM_DEBUG | |
1829 | printk(KERN_INFO "iucv_pm_prepare\n"); | |
1830 | #endif | |
1831 | if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) | |
1832 | rc = dev->driver->pm->prepare(dev); | |
1833 | return rc; | |
1834 | } | |
1835 | ||
1836 | static void iucv_pm_complete(struct device *dev) | |
1837 | { | |
1838 | #ifdef CONFIG_PM_DEBUG | |
1839 | printk(KERN_INFO "iucv_pm_complete\n"); | |
1840 | #endif | |
1841 | if (dev->driver && dev->driver->pm && dev->driver->pm->complete) | |
1842 | dev->driver->pm->complete(dev); | |
1843 | } | |
1844 | ||
1845 | /** | |
1846 | * iucv_path_table_empty() - determine if iucv path table is empty | |
1847 | * | |
1848 | * Returns 0 if there are still iucv pathes defined | |
1849 | * 1 if there are no iucv pathes defined | |
1850 | */ | |
1851 | int iucv_path_table_empty(void) | |
1852 | { | |
1853 | int i; | |
1854 | ||
1855 | for (i = 0; i < iucv_max_pathid; i++) { | |
1856 | if (iucv_path_table[i]) | |
1857 | return 0; | |
1858 | } | |
1859 | return 1; | |
1860 | } | |
1861 | ||
1862 | /** | |
1863 | * iucv_pm_freeze() - Freeze PM callback | |
1864 | * @dev: iucv-based device | |
1865 | * | |
1866 | * disable iucv interrupts | |
1867 | * invoke callback function of the iucv-based driver | |
1868 | * shut down iucv, if no iucv-pathes are established anymore | |
1869 | */ | |
1870 | static int iucv_pm_freeze(struct device *dev) | |
1871 | { | |
1872 | int cpu; | |
1873 | int rc = 0; | |
1874 | ||
1875 | #ifdef CONFIG_PM_DEBUG | |
1876 | printk(KERN_WARNING "iucv_pm_freeze\n"); | |
1877 | #endif | |
1878 | for_each_cpu_mask_nr(cpu, iucv_irq_cpumask) | |
1879 | smp_call_function_single(cpu, iucv_block_cpu_almost, NULL, 1); | |
1880 | if (dev->driver && dev->driver->pm && dev->driver->pm->freeze) | |
1881 | rc = dev->driver->pm->freeze(dev); | |
1882 | if (iucv_path_table_empty()) | |
1883 | iucv_disable(); | |
1884 | return rc; | |
1885 | } | |
1886 | ||
1887 | /** | |
1888 | * iucv_pm_thaw() - Thaw PM callback | |
1889 | * @dev: iucv-based device | |
1890 | * | |
1891 | * make iucv ready for use again: allocate path table, declare interrupt buffers | |
1892 | * and enable iucv interrupts | |
1893 | * invoke callback function of the iucv-based driver | |
1894 | */ | |
1895 | static int iucv_pm_thaw(struct device *dev) | |
1896 | { | |
1897 | int rc = 0; | |
1898 | ||
1899 | #ifdef CONFIG_PM_DEBUG | |
1900 | printk(KERN_WARNING "iucv_pm_thaw\n"); | |
1901 | #endif | |
1902 | if (!iucv_path_table) { | |
1903 | rc = iucv_enable(); | |
1904 | if (rc) | |
1905 | goto out; | |
1906 | } | |
1907 | if (cpus_empty(iucv_irq_cpumask)) { | |
1908 | if (iucv_nonsmp_handler) | |
1909 | /* enable interrupts on one cpu */ | |
1910 | iucv_allow_cpu(NULL); | |
1911 | else | |
1912 | /* enable interrupts on all cpus */ | |
1913 | iucv_setmask_mp(); | |
1914 | } | |
1915 | if (dev->driver && dev->driver->pm && dev->driver->pm->thaw) | |
1916 | rc = dev->driver->pm->thaw(dev); | |
1917 | out: | |
1918 | return rc; | |
1919 | } | |
1920 | ||
1921 | /** | |
1922 | * iucv_pm_restore() - Restore PM callback | |
1923 | * @dev: iucv-based device | |
1924 | * | |
1925 | * make iucv ready for use again: allocate path table, declare interrupt buffers | |
1926 | * and enable iucv interrupts | |
1927 | * invoke callback function of the iucv-based driver | |
1928 | */ | |
1929 | static int iucv_pm_restore(struct device *dev) | |
1930 | { | |
1931 | int rc = 0; | |
1932 | ||
1933 | #ifdef CONFIG_PM_DEBUG | |
1934 | printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table); | |
1935 | #endif | |
1936 | if (cpus_empty(iucv_irq_cpumask)) { | |
1937 | rc = iucv_query_maxconn(); | |
1938 | rc = iucv_enable(); | |
1939 | if (rc) | |
1940 | goto out; | |
1941 | } | |
1942 | if (dev->driver && dev->driver->pm && dev->driver->pm->restore) | |
1943 | rc = dev->driver->pm->restore(dev); | |
1944 | out: | |
1945 | return rc; | |
1946 | } | |
1947 | ||
2356f4cb MS |
1948 | /** |
1949 | * iucv_init | |
1950 | * | |
1951 | * Allocates and initializes various data structures. | |
1952 | */ | |
da99f056 | 1953 | static int __init iucv_init(void) |
2356f4cb MS |
1954 | { |
1955 | int rc; | |
70cf5035 | 1956 | int cpu; |
2356f4cb MS |
1957 | |
1958 | if (!MACHINE_IS_VM) { | |
1959 | rc = -EPROTONOSUPPORT; | |
1960 | goto out; | |
1961 | } | |
1962 | rc = iucv_query_maxconn(); | |
1963 | if (rc) | |
1964 | goto out; | |
da99f056 | 1965 | rc = register_external_interrupt(0x4000, iucv_external_interrupt); |
2356f4cb MS |
1966 | if (rc) |
1967 | goto out; | |
035da16f | 1968 | iucv_root = root_device_register("iucv"); |
2356f4cb MS |
1969 | if (IS_ERR(iucv_root)) { |
1970 | rc = PTR_ERR(iucv_root); | |
2d7bf367 | 1971 | goto out_int; |
2356f4cb | 1972 | } |
70cf5035 CL |
1973 | |
1974 | for_each_online_cpu(cpu) { | |
1975 | /* Note: GFP_DMA used to get memory below 2G */ | |
1976 | iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data), | |
1977 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1978 | if (!iucv_irq_data[cpu]) { | |
1979 | rc = -ENOMEM; | |
1980 | goto out_free; | |
1981 | } | |
1982 | ||
1983 | /* Allocate parameter blocks. */ | |
1984 | iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param), | |
1985 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1986 | if (!iucv_param[cpu]) { | |
1987 | rc = -ENOMEM; | |
1988 | goto out_free; | |
1989 | } | |
42e1b4c2 UB |
1990 | iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param), |
1991 | GFP_KERNEL|GFP_DMA, cpu_to_node(cpu)); | |
1992 | if (!iucv_param_irq[cpu]) { | |
1993 | rc = -ENOMEM; | |
1994 | goto out_free; | |
1995 | } | |
1996 | ||
2356f4cb | 1997 | } |
2d7bf367 CH |
1998 | rc = register_hotcpu_notifier(&iucv_cpu_notifier); |
1999 | if (rc) | |
2000 | goto out_free; | |
6c005961 UB |
2001 | rc = register_reboot_notifier(&iucv_reboot_notifier); |
2002 | if (rc) | |
2003 | goto out_cpu; | |
2356f4cb MS |
2004 | ASCEBC(iucv_error_no_listener, 16); |
2005 | ASCEBC(iucv_error_no_memory, 16); | |
2006 | ASCEBC(iucv_error_pathid, 16); | |
2007 | iucv_available = 1; | |
2d7bf367 CH |
2008 | rc = bus_register(&iucv_bus); |
2009 | if (rc) | |
6c005961 | 2010 | goto out_reboot; |
2356f4cb MS |
2011 | return 0; |
2012 | ||
6c005961 UB |
2013 | out_reboot: |
2014 | unregister_reboot_notifier(&iucv_reboot_notifier); | |
2d7bf367 CH |
2015 | out_cpu: |
2016 | unregister_hotcpu_notifier(&iucv_cpu_notifier); | |
70cf5035 CL |
2017 | out_free: |
2018 | for_each_possible_cpu(cpu) { | |
42e1b4c2 UB |
2019 | kfree(iucv_param_irq[cpu]); |
2020 | iucv_param_irq[cpu] = NULL; | |
70cf5035 CL |
2021 | kfree(iucv_param[cpu]); |
2022 | iucv_param[cpu] = NULL; | |
2023 | kfree(iucv_irq_data[cpu]); | |
2024 | iucv_irq_data[cpu] = NULL; | |
2025 | } | |
035da16f | 2026 | root_device_unregister(iucv_root); |
2356f4cb MS |
2027 | out_int: |
2028 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
2029 | out: | |
2030 | return rc; | |
2031 | } | |
2032 | ||
2033 | /** | |
2034 | * iucv_exit | |
2035 | * | |
2036 | * Frees everything allocated from iucv_init. | |
2037 | */ | |
da99f056 | 2038 | static void __exit iucv_exit(void) |
2356f4cb | 2039 | { |
04b090d5 | 2040 | struct iucv_irq_list *p, *n; |
70cf5035 | 2041 | int cpu; |
2356f4cb | 2042 | |
04b090d5 MS |
2043 | spin_lock_irq(&iucv_queue_lock); |
2044 | list_for_each_entry_safe(p, n, &iucv_task_queue, list) | |
2045 | kfree(p); | |
2356f4cb MS |
2046 | list_for_each_entry_safe(p, n, &iucv_work_queue, list) |
2047 | kfree(p); | |
04b090d5 | 2048 | spin_unlock_irq(&iucv_queue_lock); |
6c005961 | 2049 | unregister_reboot_notifier(&iucv_reboot_notifier); |
2356f4cb | 2050 | unregister_hotcpu_notifier(&iucv_cpu_notifier); |
70cf5035 | 2051 | for_each_possible_cpu(cpu) { |
42e1b4c2 UB |
2052 | kfree(iucv_param_irq[cpu]); |
2053 | iucv_param_irq[cpu] = NULL; | |
70cf5035 CL |
2054 | kfree(iucv_param[cpu]); |
2055 | iucv_param[cpu] = NULL; | |
2056 | kfree(iucv_irq_data[cpu]); | |
2057 | iucv_irq_data[cpu] = NULL; | |
2058 | } | |
035da16f | 2059 | root_device_unregister(iucv_root); |
2356f4cb MS |
2060 | bus_unregister(&iucv_bus); |
2061 | unregister_external_interrupt(0x4000, iucv_external_interrupt); | |
2062 | } | |
2063 | ||
2064 | subsys_initcall(iucv_init); | |
2065 | module_exit(iucv_exit); | |
2066 | ||
2356f4cb MS |
2067 | MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
2068 | MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver"); | |
2069 | MODULE_LICENSE("GPL"); |